JP7036775B2 - Centralized substation equipment - Google Patents

Description

The present invention relates to an integrated substation facility.

In or near the power plant, there are several substations installed at the stage of transmitting voltage from the power plant, for example, to gradually boost the voltage to an ultra-high voltage of 500,000 volts. In addition, the ultra-high voltage transmitted via the power grid is gradually stepped down to the voltage used in power receiving equipment such as offices and factories (for example, 22,000 volts or 6600 volts). Some are installed in the middle of. The various facilities that make up the substation installed in the substation tend to increase in size as the transmission voltage and the receiving voltage of the substation increase.

In Patent Document 1, various equipments (constituent units) such as an extra-high voltage panel, a transformer, a high-voltage panel, a circuit breaker panel, and an instrument transformer panel are individually installed, and each equipment is installed according to a system diagram via a duct or the like. The substation equipment to which is connected is disclosed.

Japanese Unexamined Patent Publication No. 4-26306

In the substation equipment disclosed in Patent Document 1, various equipment constituting the entire substation equipment is arranged at a predetermined position to perform installation work, and wiring work for wiring the various equipment according to a system diagram is required. For example, when the voltage classification of a substation becomes an extra high voltage, the shape of various equipment also becomes large, and the period and cost of installation work and wiring work of various equipment increase.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an integrated substation equipment capable of reducing the construction period, construction cost, transportation cost and installation area of the substation equipment.

The centralized substation equipment according to the present invention forms a box body surrounded by two longitudinal side plates and two lateral side plates, and has a transformer tank in which a transformer main body is housed, and the longitudinal side plate or the above. It is provided with an NGR board that is detachably attached to any of the side plates on the short side and houses a neutral point grounding resistor connected to the received voltage side of the transformer main body .

According to the present invention, it is possible to reduce the construction period, construction cost, transportation cost and installation area of the substation equipment.

It is an external perspective view which shows an example of the structure of the centralized substation equipment of this embodiment. It is a top view which shows an example of the main part structure of the transformer tank of this embodiment. It is a front view which shows an example of the structure of the centralized substation equipment of this embodiment. It is a left side view which shows an example of the structure of the centralized substation equipment of this embodiment. It is a right side view which shows an example of the structure of the centralized substation equipment of this embodiment. It is a top view which shows an example of the structure of the centralized substation equipment of this embodiment. It is a schematic diagram which shows an example of the attachment state of the feeder board of this embodiment. It is a schematic diagram which shows the installation example of the substation equipment in the case of the comparative example. It is a system diagram of the substation equipment in the case of the comparative example. It is a schematic diagram which shows the installation example of the centralized substation equipment of this embodiment. It is a system diagram of the centralized substation equipment of this embodiment.

Hereinafter, the present invention will be described with reference to the drawings showing the embodiments thereof. FIG. 1 is an external perspective view showing an example of the configuration of the integrated substation equipment 100 of the present embodiment. In the figure, reference numeral 10 is a transformer tank. The external dimensions of the transformer tank 10 can be, for example, about 4 m in length, about 1 m in width, and about 2 m in height. Assuming that the four side plates of the transformer tank 10 are the side plates on the front side, the back side, the right side side, and the left side side for convenience, the side plates on the front side of the transformer tank 10 have three feeder boards 20 (VCB). (Also referred to as a board) and a relay board 30 are arranged. A DC power supply panel 50 and four radiators 60 (also referred to as cooling devices) are arranged on the side plate on the back side of the transformer tank 10. On the right side plate of the transformer tank 10, three aerial bushings 11 corresponding to each phase of three-phase alternating current are arranged at appropriate lengths and distances. The NGR board 40 is arranged on the left side plate of the transformer tank 10. A conservator 61 is attached to the top plate of the transformer tank 10.

The feeder board 20, the relay board 30, the NGR board 40, and the DC power supply board 50 can be detachably attached to the transformer tank 10. That is, all or part of the feeder board 20, the relay board 30, the NGR board 40, and the DC power supply board 50 can be attached to the transformer tank 10 before the centralized substation equipment 100 is carried out from the factory. Further, after the integrated substation equipment 100 is transported to the installation location, a part of the feeder board 20, the relay board 30, the NGR board 40, and the DC power supply board 50 can be attached to the transformer tank 10. The arrangement of the feeder board 20, the relay board 30, the NGR board 40, and the DC power supply board 50 is not limited to the example of FIG. Further, the number of feeder boards 20 and the number of radiators 60 are not limited to the example of FIG.

The centralized substation equipment 100 of the present embodiment is installed in or near a power plant, and can boost the voltage generated at the power plant and send it to the power grid. Further, the centralized substation equipment 100 is installed in a substation in the middle of the power grid, and can step down the voltage transmitted via the power grid and supply it to power receiving equipment such as offices and factories. In the present specification, the case where the centralized substation facility 100 is installed in a power plant (for example, a solar power plant) or in the vicinity of the power plant, boosts the voltage, and sends the voltage to the power grid will be described.

The centralized substation facility 100 is, for example, an centralized (packaged) substation for an extra-high (extra-high voltage) interconnection substation. Extra high voltage means that the transmission voltage exceeds 7,000 volts. The received voltage (first voltage) of the centralized substation equipment 100 can be, for example, 22 kV (or 33 kV), and the transmitted voltage (second voltage) can be, for example, 77 kV (or 66 kV). be able to. The received voltage (first voltage) of the centralized substation equipment 100 can be set to 6600 V (high voltage). That is, the centralized substation equipment 100 of the present embodiment can realize a substation equipment that handles extra high voltage or high voltage. Hereinafter, it will be described in detail.

FIG. 2 is a plan view showing an example of the main configuration of the transformer tank 10 of the present embodiment. FIG. 2 shows a case where the transformer tank 10 is viewed from above. In FIG. 2, for convenience, the equipment housed in the transformer tank 10 is shown by a broken line. An aerial bushing 11 is attached to the right side plate of the transformer tank 10. The aerial bushing 11 is a terminal for outputting a voltage (transmission voltage) of 77 kV. In the present embodiment, the output terminal on the 77 kV side is the air bushing 11, but the output terminal is not limited to the air bushing. For example, it may be a gas bushing that is directly connected to a gas-insulated switchgear (GIS).

As shown in FIG. 2, the transformer tank 10 accommodates three transformer main bodies 12 corresponding to each of the three phases, an earthed voltage transformer (EVT) main body 13, and an in-house transformer main body 14. .. Further, the transformer tank 10 is filled with insulating oil 2 for cooling the transformer main body 12. The transformer main body 12 is submerged in the insulating oil 2, but the grounded transformer main body 13 and the in-house transformer main body 14 may not be in the insulating oil 2 but may be in the air. That is, a partition wall is provided between the three transformer main bodies 12 and the grounded transformer main body 13 and the in-house transformer main body 14, and the insulating oil 2 is injected into the section accommodating the transformer main body 12 to make a grounded transformer. The inside of the section accommodating the main body 13 and the in-house transformer main body 14 can be in the air. When the grounded transformer main body 13 or the in-house transformer main body 14 is housed in the transformer tank 10, the grounded transformer main body 13 or the in-house transformer main body 14 is not used as an independent transformer and is the same as the transformer main body 12. It may be configured to have windings (for example, 4 windings).

The transformer main body 12 includes an iron core, a coil, and the like, and boosts the received voltage (first voltage, for example, 22 kV) to the transmission voltage (second voltage, for example, 77 kV).

The grounded transformer main body 13 is connected to the receiving voltage side of the transformer main body 12. The grounded transformer main body 13 is used to detect a zero-phase voltage on the received voltage side of the transformer main body 12, and for example, to cut off a required electric circuit when a one-wire ground fault occurs.

The in-house transformer main body 14 is connected to the received voltage side of the transformer main body 12 and converts the received voltage into a low voltage (third voltage, for example, 210 to 105 V). The in-house transformer main body 14 supplies an AC voltage of 105 V or 210 V to a required device in the centralized substation facility 100, for example.

Wiring between the transformer main body 12, the grounded transformer main body 13 and the in-house transformer main body 14 is performed when the transformer main body 12, the grounded transformer main body 13 and the in-house transformer main body 14 are mounted in the transformer tank 10. .. In the example of FIG. 2, the transformer tank 10 accommodates both the grounded transformer main body 13 and the in-house transformer main body 14, but only one of the grounded transformer main body 13 and the in-house transformer main body 14. May be accommodated.

Conventionally, a grounded transformer panel (also referred to as an EVT panel) separate from the transformer tank has been prepared, and the grounded transformer main body is housed in the grounded transformer panel. At the installation location of the substation equipment, the transformer tank and the grounded transformer panel, which are separately transported, are placed at predetermined positions and the installation work is performed, and the wiring work is performed according to the system diagram. In the present embodiment, the grounded transformer main body 13 is housed in the transformer tank 10, and the wiring between the grounded transformer body 13 and the transformer body 12 is also housed in the transformer tank 10. This eliminates the need for installation work and wiring work, which have been performed separately, and can reduce the construction period and construction cost of the substation equipment.

Further, conventionally, an in-house transformer board (also referred to as an in-house TR board) separate from the transformer tank has been prepared, and the in-house transformer main body is housed in the in-house transformer board. At the installation site of the substation equipment, the separately transported transformer tank and the in-house transformer panel are placed at predetermined positions for installation work, and wiring work is performed according to the system diagram. In the present embodiment, the in-house transformer main body 14 is housed in the transformer tank 10, and the wiring between the in-house transformer main body 14 and the transformer main body 12 is also housed in the transformer tank 10. This eliminates the need for installation work and wiring work, which have been performed separately, and can reduce the construction period and construction cost of the substation equipment. Further, by accommodating the grounding transformer main body 13 and the in-house transformer main body 14 in the transformer tank 10, the EVT board and the in-house TR board become unnecessary, and the installation space can be reduced.

Next, various facilities attached around the transformer tank 10 will be described.

FIG. 3 is a front view showing an example of the configuration of the centralized substation equipment 100 of the present embodiment, and FIG. 4 is a left side view showing an example of the configuration of the centralized substation equipment 100 of the present embodiment. 5 is a right side view showing an example of the configuration of the centralized substation equipment 100 of the present embodiment, and FIG. 6 is a plan view showing an example of the configuration of the centralized substation equipment 100 of the present embodiment.

As shown in FIGS. 3, 4 and 5, three feeder boards 20 are detachably attached around the transformer tank 10. More specifically, the hanging chain is fixed to a hook (not shown) provided on the top plate of the feeder board 20, the feeder board 20 is hung, moved to a predetermined position, and the upper part of the back surface of the feeder board 20 is moved. The plurality of mounting brackets 21 can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and the plurality of mounting brackets 22 on the bottom surface of the feeder board 20 can be fixed to the base 1 with bolts and nuts. The feeder board 20 can be removed from the transformer tank 10 by removing the bolts and nuts. The configuration of the fixing bracket for fixing each panel is an example, and is not limited to the example shown in each figure, and can be replaced by another configuration.

Each feeder board 20 houses a vacuum breaker (VCB: Vacuum Circuit Breaker). The vacuum circuit breaker is interposed in a feeder (electric circuit) connected to the receiving voltage side of the transformer main body 12. The feeder of the feeder board 20 includes, for example, a photovoltaic power generation panel and a PCS (direct current AC converter) via a transformer (for example, 22 kV / 440 V) of a substation and low voltage wiring (about 200 V to 400 V). Be connected.

When the transformer main body 12 is a step-down transformer, each of the plurality of feeders is connected to the factory via, for example, a transformer of a substation (for example, 22 kV / 440 V) and low voltage wiring (about 200 V to 400 V). And office power receiving equipment are connected.

A vacuum circuit breaker (VCB) is a switch that turns the electric circuit on and off, and contains the electrodes of the switch in a high-vacuum container and contains a substance that constitutes an arc discharge generated between the electrodes when the current is cut off. It is a circuit breaker that diffuses in a high vacuum to extinguish the arc.

Conventionally, as many VCB boards as the number of feeders have been prepared, and at the installation location of the substation equipment, each of the separately transported VCB boards is placed in a predetermined position for installation work, and wiring work is performed according to the system diagram. Is done. In the present embodiment, since the feeder board 20 is attached around the transformer tank 10, the feeder board 20 is also installed by simply performing the installation work of the transformer tank 10, and the VCB board that is required individually is installed. No construction is required. Further, when the plurality of feeder boards 20 are attached around the transformer tank 10, wiring to a plurality of vacuum circuit breakers is also performed, so that wiring work at the installation site is not required, and the construction period and construction cost of the substation equipment are reduced. can do.

As shown in FIGS. 4 and 6, the DC power supply panel 50 is detachably attached around the transformer tank 10. More specifically, the hanging chain is fixed to a hook (not shown) provided on the top plate of the DC power supply board 50 to suspend the DC power supply board 50 and move it to a predetermined position to move the DC power supply board 50 to a predetermined position. The plurality of mounting brackets 51 on the upper part of the back surface can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and the plurality of mounting brackets 52 on the bottom surface of the DC power supply panel 50 can be fixed to the base 1 with bolts and nuts. By removing the bolts and nuts, the DC power supply panel 50 can be removed from the transformer tank 10. Further, when the DC power supply panel 50 is attached to the transformer tank 10, necessary wiring can be performed by connecting a bushing (not shown).

The DC power supply board 50 accommodates a DC power supply device (DC power supply main body) 53 (see FIG. 11 described later) that supplies a DC voltage for operating a device including a plurality of vacuum circuit breakers. The device is a device that requires a DC voltage as a power source, and includes, for example, a circuit breaker, a disconnector, a protective relay, and other control circuits. If the transformer cooling device is not self-cooling, the cooling device is also included in the equipment.

Conventionally, a DC power supply panel separate from the transformer tank was prepared, and at the installation location of the substation equipment, the transformer tank and the DC power supply panel transported separately were placed in predetermined positions for installation work. Wiring work is carried out according to the system diagram. In the present embodiment, since the DC power supply panel 50 is attached around the transformer tank 10, the DC power supply panel 50 is also installed by simply installing the transformer tank 10, and the DC power supply required individually is installed. Installation work of the board becomes unnecessary. Further, since the wiring required for mounting the DC power supply panel 50 around the transformer tank 10 is performed in advance, wiring work at the installation location is not required, and the construction period and construction cost of the substation equipment can be reduced. ..

As shown in FIGS. 3, 4, and 6, the NGR (Neutral Grounding Resistor) panel 40 is detachably attached around the transformer tank 10. More specifically, the hanging chain is fixed to a hook (not shown) provided on the top plate of the NGR board 40 to hang the NGR board 40 and move it to a predetermined position on the upper part of the back surface of the NGR board 40. A plurality of mounting brackets 41 can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and a plurality of mounting brackets 42 on the bottom surface of the NGR board 40 can be fixed to the base by bolts and nuts. The NGR board 40 can be removed from the transformer tank 10 by removing the bolts and nuts. Further, when the NGR board 40 is attached to the transformer tank 10, necessary wiring can be performed by connecting a bushing (not shown).

The NGR board 40 accommodates a neutral point grounding resistor connected to the received voltage side of the transformer main body 12. A neutral point grounded resistor (NGR) is a resistor that suppresses and detects a ground fault current attached to a neutral point of a grounded transformer (EVT or GPT: also referred to as a grounded potential transformer).

Conventionally, an NGR board separate from the transformer tank was prepared, and at the installation location of the substation equipment, the separately transported transformer tank and NGR board were placed in predetermined positions for installation work, and the system diagram was performed. Wiring work is carried out according to. In the present embodiment, since the NGR board 40 is attached around the transformer tank 10, the NGR board 40 is also installed by simply installing the transformer tank 10, and the NGR board 40 required individually is installed. No installation work is required. Further, since the wiring required for mounting the NGR board 40 around the transformer tank 10 is performed in advance, the wiring work at the installation location becomes unnecessary, and the construction period and the construction cost of the substation equipment can be reduced.

As shown in FIGS. 3, 5 and 6, the relay panel 30 is detachably attached around the transformer tank 10. More specifically, the hanging chain is fixed to a hook (not shown) provided on the top plate of the relay board 30 to suspend the relay board 30 and move it to a predetermined position on the upper part of the back surface of the relay board 30. A plurality of mounting brackets (not shown) can be fixed to the side surface of the transformer tank 10 with bolts and nuts, and a plurality of mounting brackets 32 on the bottom surface of the relay panel 30 can be fixed to the base 1 with bolts and nuts. The relay panel 30 can be removed from the transformer tank 10 by removing the bolts and nuts. Further, when the relay panel 30 is attached to the transformer tank 10, necessary wiring can be performed by connecting a bushing (not shown).

The relay panel 30 is a plurality of protective relays 35 that send a control signal to the circuit breaker VCB 303 (see FIG. 11) provided in the interconnection switch 300 (see FIG. 11) connected to the transmission voltage side of the transformer main body 12. , 36, 37, and a plurality of protective relays 38 (see FIG. 11) that send control signals to the circuit breaker VCB 25 in the feeder board 20. The interconnection switchgear 300 is, for example, a gas-insulated switchgear (GIS), and is a current transformer, a breaker, a circuit breaker, a lightning arrester, an EVT (grounding transformer), and a grounding device (also a grounding device for work). It is a device in which a bus (referred to as), a bus, and the like are housed in a single grounding container filled with a highly insulating gas (for example, sulfur hexafluoride). The arc can be extinguished (extinguished) by blowing a gas against the arc discharge generated between the electrodes when the current is cut off. The interconnection switchgear (also referred to as a switchgear) may be a hybrid GIS in which the bus portion is air-insulated and the switchgear is gas-insulated.

Protective relays detect failures such as short-circuit failures or ground faults that occur in substation equipment through instrument transformers and minimize the effects of the detected failures on other parts of the power system. Therefore, a control signal is sent to the circuit breaker so as to identify the faulty section and quickly disconnect it from the power system.

Conventionally, a relay panel separate from the transformer tank was prepared, and at the installation location of the substation equipment, the separately transported transformer tank and relay panel were placed in predetermined positions for installation work. Wiring work is carried out according to. In the present embodiment, since the relay panel 30 is attached around the transformer tank 10, the installation work of the relay panel 30 becomes unnecessary. In addition, since the wiring required when mounting the relay panel 30 around the transformer tank 10 is also performed in advance, it is possible to reduce the wiring work at the installation site, and reduce the construction period and construction cost of the substation equipment. Can be done.

As shown in FIGS. 5 and 6, a radiator 60 for circulating the insulating oil 2 filled in the transformer tank 10 to cool the insulating oil is attached around the transformer tank 10. The transformer main body 12 is provided with an iron core, a coil, and the like, and although the voltage conversion efficiency can be increased, copper loss and iron loss occur and are converted into heat. As the voltage handled by the substation equipment increases, the transformer also handles a large amount of electric power, and heat generation becomes a problem. Therefore, the inside of the transformer tank 10 is filled with the insulating oil 2, and the transformer main body 12 is housed in the insulating oil 2. The insulating oil 2 that has absorbed the heat generated in the transformer main body 12 is sent to the radiator 60, cooled by the radiator 60, and circulated again in the transformer tank 10. This makes it possible to realize a substation facility that handles a high voltage (for example, extra high voltage).

As shown in FIG. 6, the dimensions in the width direction of the integrated substation equipment 100 with the feeder board 20, the relay board 30, the NGR board 40, the DC power supply board 50, and the radiator 60 mounted around the transformer tank 10. By setting the value within a predetermined value (for example, 3 m), the entire centralized substation equipment 100 can be collectively mounted on a transport vehicle and transported.

FIG. 7 is a schematic view showing an example of the mounting state of the feeder board 20 of the present embodiment. FIG. 7 schematically shows a vertical cross section of a main part of the transformer tank 10 and the feeder board 20. The transformer tank 10 is filled with insulating oil 2. The transformer main body 12 is held in the insulating oil 2. For convenience, the holding member for holding the transformer main body 12 is omitted. The transformer main body 12 includes an iron core 121, a coil 122, and the like, and a lead wire 123 is derived from the coil 122.

A vacuum breaker 23 is fixed at a required position on the inner wall of the feeder board 20. The vacuum circuit breaker 23 includes a vacuum valve 24, and the feeder board 20 accommodates a wiring portion 27 wired from an electrode 232 provided in the vacuum valve 24 to the outside of the vacuum valve 24. The vacuum valve 24 is molded with resin 231 (for example, epoxy resin). Further, the wiring portion 27 is molded with a resin 25 (for example, an epoxy resin or the like).

For example, a voltage of 22 kV is applied to the electric circuit cut off by the electrode 232 of the vacuum circuit breaker 23. For this reason, conventionally, it is necessary to provide a relatively long creepage distance between the charging part such as the vacuum circuit breaker and the wiring part and the VCB board (touched by a person) accommodating the vacuum circuit breaker in order to maintain sufficient insulation. There was a tendency for the shape of the VCB board to become large. In the present embodiment, since the vacuum valve 24 and the wiring portion 27 are molded with the resins 231 and 25, the dielectric strength is increased, the creepage distance can be relatively shortened, and the feeder board 20 is miniaturized. It is possible to realize low cost. In the present embodiment, the vacuum circuit breakers 23 are housed in each of the feeder boards 20, but since the size can be reduced, a plurality of (for example, two) vacuum circuit breakers 23 (2) can be accommodated in one feeder board 20. One of them may accommodate a vacuum circuit breaker 23 for the main feeder).

As shown in FIG. 7, the connector portion 26 is attached to the side plate 10a of the transformer tank 10. The outlet line 123 on the receiving voltage side of the transformer main body 12 is connected to the connector portion 26. Further, a wiring portion 27 molded with the resin 25 of the feeder board 20 is connected to the connector portion 26. The connector portion 26 is, for example, a slip-on type connector, and the outlet wire 123 and the wiring portion 27 are electrically connected and insulated by a bushing. As a result, when the feeder board 20 is attached to the transformer tank 10, wiring can be easily performed only by connecting the connector portion 26, and complicated wiring work is not required.

Next, as a comparative example with respect to the present embodiment, a case where various facilities are individually installed at the installation location will be described.

FIG. 8 is a schematic diagram showing an installation example of the substation equipment in the case of the comparative example. FIG. 8 shows a case where each facility is viewed from above, and shows an outline of the installation area (occupied area). As shown in FIG. 8, the substation equipment in the case of the comparative example is the in-house TR board 255, EVT board 220, VCB board (main trunk) 230, VCB board (feeder F1) 240, VCB board (feeder F2) 250, VCB board. (Feeder F3) 260, relay board 210, DC power supply board 270, NGR board 280, for example, nine equipment (units) are arranged and installed in a row. For the installation work, for example, concrete foundation work is performed, and each facility is fixed with anchor bolts or the like. Further, depending on the position of the steel tower of the substation, an interconnection switch 300, a VCT (Voltage and Current Transformer) 400, and a transformer 200 are arranged and installed. A duct is provided between the transformer 200 and each facility, and necessary wiring work is performed through the duct.

FIG. 9 is a system diagram of the substation equipment in the case of the comparative example. Note that FIG. 9 does not show all the wiring, but shows only the main wiring. As shown in FIG. 9, a circuit breaker VCB241, a current transformer 242, a protection / measuring instrument 243, and the like are connected in the VCB board (F1) 240. In the VCB board (F2) 250, a circuit breaker VCB251, a current transformer 252, a protection / measuring instrument 253, and the like are connected. In the VCB board (F3) 260, a circuit breaker VCB261, a current transformer 262, a protection / measuring instrument 263, and the like are connected. A current transformer 235, a circuit breaker VCB232, a protection / measuring instrument 233, a protective relay 234, and the like are connected in the VCB board (main trunk) 230. In FIG. 9, the NGR board 280 is not shown.

Inside the EVT board 220, a lightning arrester 221, an EVT 222, etc. are connected. An in-house transformer 256 (22 kV / 105V) is connected in the in-house TR board 255. Inside the DC power supply panel 270, a DC power supply device 271 is connected. In the transformer 200, the transformer 202 and the current transformers 201 and 203 are connected. Protective relays 211, 212, and 213 are connected in the relay panel 210.

In the interconnection switch 300, a current transformer 301, a disconnector 302, a circuit breaker VCB 303, a lightning arrester 304, a grounding device 305, and an EVT 306 are connected. As shown in FIG. 9, the in-house TR board 250, EVT board 220, VCB board (main trunk) 230, VCB board (feeder F1) 240, VCB board (feeder F2) 250, VCB board (feeder F3) 260, relay board 210. , DC power supply board 270, NGR board 280, transformer 200, VCT400, and interconnection switch 300 need to be connected by wiring with many cables.

As described above, in the case of the comparative example, it is necessary to arrange the various equipments constituting the entire substation equipment at predetermined positions and perform the installation work individually, and to perform the wiring work to wire the various equipments according to the system diagram. For example, when the voltage classification of a substation becomes an extra high voltage, the shape of various equipment also becomes large, and the period and cost of installation work and wiring work of various equipment increase.

Next, a case where the centralized substation equipment 100 of the present embodiment is installed at the installation location will be described.

FIG. 10 is a schematic diagram showing an installation example of the centralized substation equipment 100 of the present embodiment. FIG. 10 shows a case where each facility is viewed from above, and shows an outline of the installation area (occupied area). As shown in FIG. 10, in the case of the integrated substation equipment 100 of the present embodiment, the interconnection switch 300 and the VCT (Combines Voltage and Current Transformer) 400 are used depending on the position of the steel tower of the substation. , And the centralized substation equipment 100 is arranged and installed. That is, in the case of the comparative example shown in FIG. 8, it was necessary to install the transformer 200 and nine units individually. In this embodiment, only the centralized substation equipment 100 needs to be installed. Since the interconnection switch 300 and the VCT400 are the same as in the case of the comparative example shown in FIG. 8, they are shown by using broken lines for convenience.

As described above, according to the present embodiment, the man-hours for the concrete foundation work and the equipment installation work can be reduced, so that the equipment installation work period can be shortened. Moreover, since the man-hours for construction can be reduced, the construction cost can be reduced.

Further, in the present embodiment, the grounded transformer main body 13 corresponding to the EVT222 in the EVT board 220 of FIG. 9 is housed in the transformer tank 10. As a result, in the present embodiment, the EVT board 220 becomes unnecessary, and it is possible to contribute to the miniaturization and weight reduction of the shape of the entire substation equipment.

Further, in the present embodiment, the in-house transformer main body 14 corresponding to the in-house transformer in the in-house TR board 250 in FIG. 9 is housed in the transformer tank 10. As a result, in the present embodiment, the in-house TR board 250 becomes unnecessary, which can contribute to the miniaturization and weight reduction of the shape of the entire substation equipment.

Further, in the present embodiment, the circuit breakers VCB232, 241, 251, 261 in the VCB board (main trunk) 230, VCB board (F1) 240, VCB board (F2) 250, and VCB board (F3) 260 of FIG. 9 The vacuum circuit breaker 23 and the wiring portion 27 corresponding to the above are mold type. Thereby, in the present embodiment, the feeder board 20 can be miniaturized and the cost can be reduced. Further, by reducing the number of equipment (units) and making the vacuum circuit breaker 23 and the wiring portion 27 a mold type, maintenance becomes easy.

Further, in the present embodiment, the iron core 121 of the transformer main body 12 is of a type with little iron loss, and the winding of the coil 122 is an effective cross-sectional area using, for example, a stranded wire obtained by twisting a large number of thin wires having a small cross-sectional area. By increasing the size of the transformer and reducing the copper loss, it is possible to suppress heat generation by using a transformer with high conversion efficiency. As a result, the shape of the radiator 60 can be made smaller and lighter, and the number of radiators 60 can be reduced as compared with the case of the comparative example.

Further, the installation area (occupied area) of the centralized substation equipment 100 of the present embodiment can be significantly reduced (for example, about 40% to 60%) as compared with the case of the comparative example, and the installation space can be secured. Will be easier. Since the centralized substation equipment 100 of the present embodiment can be made smaller and lighter, for example, the centralized substation equipment 100 can be transported by one transport vehicle, and a plurality of units can be transported like the conventional substation equipment. It is possible to reduce the transportation cost as compared with the case of transporting by the transport vehicle of.

FIG. 11 is a system diagram of the centralized substation equipment 100 of the present embodiment. Note that FIG. 11 does not show all the wiring, but shows only the main wiring. In FIG. 11, the interconnection switch 300 and the VCT 400 are the same as in the case of FIG. 9, so the description thereof will be omitted. In the centralized substation equipment 100, a feeder board 20, a relay board 30, a DC power supply board 50, and an NGR board 40 (not shown) are arranged around the transformer tank 10.

In the transformer tank 10, a transformer (transformer main body) 12, current transformers 15, 16, EVT (grounding transformer) 13, an in-house transformer (in-house transformer main body) 14, a lightning arrester 17, and the like are connected. There is. In the feeder board 20, a circuit breaker VCB (vacuum circuit breaker) 23, a current transformer 28, a protection / measuring instrument 29, and the like are connected. Protective relays 35, 36, 37, 38 and the like are connected in the relay panel 30. A DC power supply device 53 is connected in the DC power supply panel 50. Further, wiring between the transformer tank 10, the feeder board 20, the relay board 30, and the DC power supply board 50 is also realized in advance in the integrated substation facility 100.

Compared with the case of the comparative example shown in FIG. 9, in this embodiment, the wiring between each facility (unit) at the installation location can be significantly reduced, the wiring work time can be shortened, and the wiring material cost can be reduced. Can be reduced.

In the present embodiment, a load tap changer for suppressing power fluctuations can be provided in the transformer tank 10. The load tap changer is a device that can change the turn ratio of the transformer within a required range by selecting a certain point on the tap provided in the winding of the coil. The load tap changer can be housed in a section different from the section that houses the transformer main body 12, and the inside of the section can be filled with insulating oil.

The centralized substation equipment of the present embodiment includes a transformer main body that converts a voltage between a first voltage and a second voltage higher than the first voltage, a transformer tank that houses the transformer main body, and the like. An in-house transformer main body connected to the first voltage side of the transformer main body and converting a voltage between the first voltage and a third voltage lower than the first voltage, and the first of the transformer main body. 1 A grounded transformer main body connected to the voltage side is provided, and at least one of the in-house transformer main body and the grounded transformer main body is housed in the transformer tank.

In this embodiment, the transformer tank houses a transformer body that converts a voltage between a first voltage and a second voltage higher than the first voltage. The first voltage can be, for example, 22 kV, in which case the second voltage can be 66 kV or 77 kV. The transformer body can be used not only as a step-up transformer but also as a step-down transformer. The transformer tank is filled with oil for cooling the transformer (iron core and winding).

The in-house transformer main body is connected to the first voltage side of the transformer main body, and converts a voltage between the first voltage and a third voltage lower than the first voltage. The third voltage can be, for example, 105V or 210V. The in-house transformer body supplies, for example, an AC voltage of 105V or 210V to the required equipment in the centralized substation equipment.

The grounded transformer main body is connected to the first voltage side of the transformer main body. The grounded transformer body is also called EVT (Earthed Voltage Transformer), and is used to detect the zero-phase voltage on the first voltage side of the transformer body and, for example, to cut off the electric circuit when a one-wire ground fault occurs. Be done.

The transformer tank houses at least one of the in-house transformer main body and the grounded transformer main body. Conventionally, an in-house transformer board (in-house TR board) separate from the transformer tank was prepared, and the in-house transformer main body was housed in the in-house transformer board. At the installation site of the substation equipment, the separately transported transformer tank and the in-house transformer panel are placed at predetermined positions for installation work, and wiring work is performed according to the system diagram. In the present embodiment, the in-house transformer main body is housed in the transformer tank, and the wiring between the in-house transformer main body and the transformer main body is also housed in the transformer tank. This eliminates the need for installation work and wiring work, which have been performed separately, and can reduce the construction period and construction cost of the substation equipment.

Further, conventionally, a grounded transformer panel (EVT panel) separate from the transformer tank has been prepared, and the grounded transformer main body is housed in the grounded transformer panel. At the installation location of the substation equipment, the transformer tank and the grounded transformer panel, which are separately transported, are placed at predetermined positions and the installation work is performed, and the wiring work is performed according to the system diagram. In the present embodiment, the grounded transformer main body is housed in the transformer tank, and the wiring between the grounded transformer body and the transformer body is also housed in the transformer tank. This eliminates the need for installation work and wiring work, which have been performed separately, and can reduce the construction period and construction cost of the substation equipment.

The centralized substation equipment of the present embodiment includes a plurality of vacuum circuit breakers interposed in a plurality of feeders connected to the first voltage side, and a feeder board accommodating the plurality of vacuum circuit breakers. The feeder board is detachably attached around the transformer tank.

In the present embodiment, a plurality of vacuum circuit breakers are interposed in a plurality of feeders connected to the first voltage side of the transformer main body. When the transformer body is a step-up transformer, each of the plurality of feeders has a solar power generation panel, for example, via a substation transformer (for example, 22 kV / 440 V) and low voltage wiring (about 200 V to 400 V). And PCS (direct current AC converter) etc. are connected. When the transformer body is a step-down transformer, each of the plurality of feeders may be connected to a factory or a factory via, for example, a substation transformer (for example, 22 kV / 440 V) and low voltage wiring (about 200 V to 400 V). Power receiving equipment in the office is connected.

A vacuum circuit breaker (VCB) is a switch that switches the electric circuit on and off. The electrodes of the switch are housed in a high-vacuum container, and the arc discharge generated between the electrodes when the current is cut off is generated. It is a circuit breaker that diffuses the constituent substances in a high vacuum to extinguish the arc.

In the present embodiment, a feeder board (VCB board) accommodating a plurality of vacuum circuit breakers is detachably attached around the transformer tank. Conventionally, as many VCB boards as the number of feeders have been prepared, and at the installation location of the substation equipment, each of the separately transported VCB boards is placed in a predetermined position for installation work, and wiring work is performed according to the system diagram. Is done. In this embodiment, since the feeder board is attached around the transformer tank, the feeder board is also installed only by installing the transformer tank, and the installation work of the VCB board, which is required individually, is not required. Become. In addition, since wiring to multiple vacuum circuit breakers is also performed when the feeder board is attached around the transformer tank, wiring work at the installation site is not required, and the construction period and construction cost of the substation equipment can be reduced. ..

In the centralized substation equipment of the present embodiment, the vacuum circuit breaker includes a vacuum valve, and the feeder board includes a wiring portion wired from an electrode provided in the vacuum valve to the outside of the vacuum valve. , The vacuum valve and the wiring portion are molded with resin.

In this embodiment, the vacuum breaker comprises a vacuum valve. The feeder board includes a wiring portion wired from an electrode provided in the vacuum valve to the outside of the vacuum valve. The vacuum valve and the wiring part are molded with a resin (for example, epoxy resin). For example, a voltage of 22 kV is applied to the electric circuit cut off by the electrode of the vacuum circuit breaker. For this reason, conventionally, it is necessary to provide a relatively long creepage distance between the charging part such as the vacuum circuit breaker and the wiring part and the VCB board (touched by a person) accommodating the vacuum circuit breaker in order to maintain sufficient insulation. There was a tendency for the shape of the VCB board to become large. In this embodiment, since the vacuum valve and the wiring portion are molded with resin, the dielectric strength is increased, the creepage distance can be relatively shortened, the feeder board can be miniaturized, and the cost is low. It can be realized.

The centralized substation equipment of the present embodiment is attached to the side plate of the transformer tank, has a connector portion to which the outlet wire on the first voltage side of the transformer main body is connected, and is molded with the resin. The wiring portion is connected to the connector portion.

In this embodiment, the connector portion is attached to the side plate of the transformer tank. The connector portion is connected to the outlet wire on the first voltage side of the transformer main body. A wiring portion molded with resin of a feeder board is connected to the connector portion. The connector portion is, for example, a slip-on type connector, and the outlet wire and the wiring portion are electrically connected and insulated by a bushing. As a result, when the feeder board is attached to the transformer tank, wiring can be easily performed only by connecting the connector portion, and complicated wiring work is not required.

The centralized substation equipment of the present embodiment is attached to the side plate of the transformer tank, has a connector portion to which the outlet wire on the first voltage side of the transformer main body is connected, and is molded with the resin. The wiring portion is connected to the connector portion.

In the present embodiment, the DC power supply panel accommodates a DC power supply main body that supplies a DC voltage for operating a device including a plurality of vacuum circuit breakers. The device is a device that requires a DC voltage as a power source, and includes, for example, a transformer cooling device, a circuit breaker, a disconnector, a protective relay, and other control circuits.

A DC power panel is detachably attached around the transformer tank. Conventionally, a DC power supply panel separate from the transformer tank was prepared, and at the installation location of the substation equipment, the transformer tank and the DC power supply panel transported separately were placed in predetermined positions for installation work. Wiring work is carried out according to the system diagram. In this embodiment, since the DC power supply panel is attached around the transformer tank, the DC power supply panel is also installed just by installing the transformer tank, and the DC power supply panel installation work that was required individually is also performed. Is unnecessary. Further, since the wiring required for mounting the DC power supply panel around the transformer tank is performed in advance, the wiring work at the installation location becomes unnecessary, and the construction period and construction cost of the substation equipment can be reduced.

The centralized substation equipment of the present embodiment includes a neutral point grounding resistor connected to the first voltage side and an NGR board accommodating the neutral point grounding resistor, and the NGR board is the transformer. Detachable and attachable around the vessel tank.

In the present embodiment, the NGR (Neutral Grounding Resistor) panel accommodates a neutral grounding resistor connected to the first voltage side of the transformer main body. A neutral point grounded resistor (NGR) is a resistor that suppresses and detects a ground fault current attached to a neutral point of a grounded transformer (EVT or GPT: also referred to as a grounded potential transformer).

The NGR board is detachably attached around the transformer tank. Conventionally, an NGR board separate from the transformer tank was prepared, and at the installation location of the substation equipment, the separately transported transformer tank and NGR board were placed in predetermined positions for installation work, and the system diagram was performed. Wiring work is carried out according to. In this embodiment, since the NGR board is attached around the transformer tank, the NGR board is also installed only by installing the transformer tank, and the installation work of the NGR board, which is required individually, is unnecessary. Become. Further, since the wiring required for mounting the NGR panel around the transformer tank is performed in advance, the wiring work at the installation location becomes unnecessary, and the construction period and construction cost of the substation equipment can be reduced.

The centralized substation equipment of the present embodiment accommodates a plurality of protective relays that send control signals to each of the plurality of circuit breakers provided in the switchgear connected to the second voltage side, and the plurality of protective relays. A relay panel is provided, and the relay panel is detachably attached around the transformer tank.

In this embodiment, the relay panel accommodates a plurality of protective relays that send control signals to each of the plurality of circuit breakers provided in the switchgear connected to the second voltage side of the transformer main body. The switchgear is, for example, a gas-insulated switchgear (GIS), a current transformer, a circuit breaker, a circuit breaker, a lightning arrester, an EVT (grounding transformer), a grounding device (also referred to as a work grounding device), and a grounding device. This is a device in which a bus or the like is housed in a single grounding container filled with a highly insulating gas (for example, sulfur hexafluoride). The arc can be extinguished (extinguished) by blowing a gas against the arc discharge generated between the electrodes when the current is cut off. The switchgear may be a hybrid GIS in which the bus is insulated in the air and the switchgear is gas-insulated.

Protective relays detect failures such as short-circuit failures or ground faults that occur in substation equipment through instrument transformers and minimize the effects of the detected failures on other parts of the power system. Therefore, a control signal is sent to the circuit breaker so as to identify the faulty section and quickly disconnect it from the power system.

A relay panel is detachably attached around the transformer tank. Conventionally, a relay panel separate from the transformer tank was prepared, and at the installation location of the substation equipment, the separately transported transformer tank and relay panel were placed in predetermined positions for installation work. Wiring work is carried out according to. In the present embodiment, since the relay panel is attached around the transformer tank, the installation work of the relay panel becomes unnecessary. In addition, since the wiring required when installing the relay panel around the transformer tank is also performed in advance, it is possible to reduce the wiring work at the installation site, and it is possible to reduce the construction period and construction cost of the substation equipment. ..

The centralized substation equipment of the present embodiment includes a cooling device that circulates the insulating oil filled in the transformer tank to cool the insulating oil, and the cooling device is attached around the transformer tank. ..

In the present embodiment, a cooling device for circulating the insulating oil filled in the transformer tank to cool the insulating oil is attached around the transformer tank. The transformer main body is provided with an iron core, a coil, and the like, and although the voltage conversion efficiency can be increased, copper loss and iron loss occur and are converted into heat. As the voltage handled by the substation equipment increases, the transformer also handles a large amount of electric power, and heat generation becomes a problem. Therefore, the inside of the transformer tank is filled with insulating oil, and the transformer main body is housed in the insulating oil. The insulating oil that has absorbed the heat generated in the transformer body is sent to the cooling device, cooled by the cooling device, and circulated again in the transformer tank. This makes it possible to realize a substation facility that handles a high voltage.

In the centralized substation equipment of the present embodiment, the first voltage is classified into extra high voltage or high voltage, and the second voltage is classified into extra high voltage.

In the present embodiment, the first voltage is classified into extra high voltage (also referred to as extra high voltage) or high voltage, and the second voltage is classified into extra high voltage. Extra high voltage means that the transmission voltage exceeds 7,000 volts. The first voltage will be 22 kV or 33 kV and the second voltage will be 66 kV or 77 kV. Further, the first voltage may be 6600V (high voltage). This makes it possible to realize a substation facility that handles extra high voltage or high voltage.

It should be noted that at least a part of the above-described embodiments can be arbitrarily combined.

1 Base 2 Insulation oil 10 Transformer tank 11 Air bushing 12 Transformer body 121 Iron core 122 Coil 123 Outlet wire 13 Grounding transformer body (EVT)
14 In-house transformer body 15, 16 Current transformer 17 Lightning arrester 20 Feeder board (VCB board)
21, 22, 32, 41, 42, 51, 52 Mounting bracket 23 Circuit breaker (circuit breaker VCB)
232 Electrode 24 Vacuum valve 231, 25 Resin 26 Connector part 27 Wiring part 28 Current transformer 29 Protective / measuring instrument 30 Protective relay board 35, 36, 37, 38 Protective relay board 40 NGR board 50 DC power supply board 53 DC power supply (DC power supply) Body)
60 Heat sink 61 Conservator

Claims (7)

A transformer tank that forms a box surrounded by two longitudinal side plates and two short side plates and houses the transformer body.
An NGR board that is detachably attached to either the longitudinal side plate or the short side plate and accommodates a neutral point grounding resistor connected to the receiving voltage side of the transformer body .
A relay panel that houses a protective relay that is detachably attached to either one of the longitudinal side plates and sends a control signal to a circuit breaker provided in a switchgear connected to the transmission voltage side of the transformer body.
Centralized substation equipment equipped with. A transformer tank that forms a box surrounded by two longitudinal side plates and two short side plates and houses the transformer body.
An NGR board that is detachably attached to either the longitudinal side plate or the short side plate and accommodates a neutral point grounding resistor connected to the receiving voltage side of the transformer body.
When the NGR board is attached to the long side plate, it is detachably attached to the short side plate, and when the NGR board is attached to the short side plate, it is detachably attached to the long side plate and aggregated. With a DC power supply panel that houses a DC power supply that supplies DC voltage to operate the equipment in the type substation equipment.
Centralized substation equipment equipped with. A transformer tank that forms a box surrounded by two longitudinal side plates and two short side plates and houses the transformer body.
An NGR board that is detachably attached to either the longitudinal side plate or the short side plate and accommodates a neutral point grounding resistor connected to the receiving voltage side of the transformer body.
With a grounded transformer body housed in the transformer tank and for detecting the zero-phase voltage on the receiving voltage side of the transformer body .
Centralized substation equipment equipped with. A transformer tank that forms a box surrounded by two longitudinal side plates and two short side plates and houses the transformer body.
An NGR board that is detachably attached to either the longitudinal side plate or the short side plate and accommodates a neutral point grounding resistor connected to the receiving voltage side of the transformer body.
With the in-house transformer main body housed in the transformer tank and converting the received voltage of the transformer main body into a voltage lower than the received voltage.
Centralized substation equipment equipped with. Claims 1 to 4 include one or a plurality of feeder boards detachably attached to one of the longitudinal side plates and accommodating a vacuum circuit breaker interposed in an electric circuit on the receiving voltage side of the transformer main body. The centralized substation equipment described in any one of the items . A claim comprising one or more cooling devices detachably attached to the other end of the longitudinal side plate to cool the insulating oil filled in the transformer tank and circulate the cooled insulating oil into the transformer tank. The centralized substation equipment according to any one of items 1 to 5 . The invention according to any one of claims 1 to 6 , which is attached to the other side of the short side plate and is provided with an aerial bushing or a gas bushing that is appropriately separated for each phase of alternating current of the transformer body. The centralized substation equipment described.

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