CN219697294U - Back-to-back working condition magnetic switch opening circuit of pumping and storage unit - Google Patents
Back-to-back working condition magnetic switch opening circuit of pumping and storage unit Download PDFInfo
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- CN219697294U CN219697294U CN202321230078.3U CN202321230078U CN219697294U CN 219697294 U CN219697294 U CN 219697294U CN 202321230078 U CN202321230078 U CN 202321230078U CN 219697294 U CN219697294 U CN 219697294U
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- 238000005086 pumping Methods 0.000 title claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 abstract description 11
- 230000008033 biological extinction Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 230000003068 static effect Effects 0.000 description 6
- 230000004044 response Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Abstract
The utility model discloses a back-to-back working condition magnetic switch separating circuit of a pumping and accumulating unit, which comprises the following components: the unit accident switching circuit is conducted when the accident unit is stopped in accident; the unit non-accident switching circuit, the magnetic extinction switch of the accident unit, its first magnetic extinction switch break-in coil connects with unit accident switching circuit in series; the second magnetic-killing switch separating coil is connected with the non-accident switch circuit of the non-accident unit in series; and the unit state monitoring circuit is used for transmitting power to the coil of the electrified monitoring relay when the electric shaft between the accident unit and the non-accident unit is successfully established, and the first contact and the second contact of the coil of the electrified monitoring relay are conducted after the coil of the electrified monitoring relay is electrified so as to conduct the non-accident switching circuit of the unit. The back-to-back working condition magnetic switch switching-off circuit of the pumping and accumulating unit can realize synchronous switching-off of the non-accident unit magnetic switch when one unit is stopped in a back-to-back dragging process of the pumping and accumulating unit, and has the advantages of simple circuit structure and high reliability.
Description
Technical Field
The utility model relates to the technical field of electric power correlation, in particular to a back-to-back working condition magnetic switch opening circuit of a pumping and accumulating unit.
Background
When the pumped storage power station is started under the electric working condition, an external power source is required to drag the unit from a static state to a synchronous rotating speed, so that synchronous operation of accessing to a power grid can be realized. There are currently two ways: static frequency converters (Static Frequency Convertor, SFC) mode and Back To Back (BTB) mode. The static frequency converter mode is slower in starting speed, and because of the cost problem, only one static frequency converter is generally configured in the whole factory, and when the static frequency converter fails and cannot be started, a backup mode is needed to realize the starting of the electric working condition of the unit. The back-to-back starting mode is characterized in that one of the two units is used as a generator, the other one is used as a motor, the electric state of the units is complex, the electric protection requirement is higher, and especially for a cross-runner unit, so that a towing machine/a towed machine under the back-to-back starting working condition is required to trigger the electric accident to stop and immediately disconnect the electric connection between the two units when any unit has an accident. However, the rotational speed during the BTB start-up process still does not reach the synchronous rotational speed, and the low frequency switching of the unit generator outlet circuit breaker (General Circuit Breaker, GCB) can cause rapid decay of the GCB service life and even serious equipment damage. Therefore, the GCB switching-off loop is generally blocked at low frequency to perform de-excitation so as to weaken or eliminate the induced voltage and current generated by the unit due to the rotation inertia. However, when the unit de-excitation is not synchronous, especially when the de-excitation switch (Field Circuit Breaker, FCB) of the towed unit acts first, the towed unit can instantly discharge the electromagnetic load of the towed unit. However, the electric shaft is still in a connection state at this time, so that the phenomenon of rising of the rotating speed and the voltage surge of the stator current, the machine end and the starting bus can occur due to the surplus energy of the dragging machine set. Therefore, the phase difference between the de-excitation time of the towing machine and the de-excitation time of the towed machine is small or the synchronous method is needed to prevent the electric accident caused by the phenomenon. However, the electrical working condition of the pumping and accumulating unit is complex, the electrical protection switching off and de-excitation is divided into a plurality of main transformer protection, generator protection, main transformer non-electric quantity protection, short lead protection and the like, and the monitoring accident shutdown is considered to divide the de-excitation switch loop, and the monitoring switching-on and switching-off object is divided into a plurality of main PLC, a water machine backup protection PLC or a backup protection relay loop, an accident button and the like. If synchronous operation is considered to be performed by opening simultaneously with protection, and two split-gate coil loops are generally designed, about 14 groups of synchronous tripping loops are required to be added. For the protection output loop with no redundancy configuration, if the main transformer is not in electric quantity protection and is in de-excitation and the accident shutdown is monitored and is in de-excitation, an output relay is required to be added and part of control logic is required to be modified, the circuit structure is very complex, and the reliability is low.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the back-to-back working condition magnetic switch switching-off circuit of the pumping and storage unit, which can realize synchronous switching-off of the non-accident unit magnetic switch when one unit is in accident in the back-to-back dragging process of the pumping and storage unit, and has the advantages of simple circuit structure and high reliability.
The back-to-back working condition magnetic switch brake-separating circuit of the pumping and accumulating unit is applied to the pumping and accumulating unit, the pumping and accumulating unit comprises an accident unit and a non-accident unit which are in back-to-back working conditions, and the back-to-back working condition magnetic switch brake-separating circuit of the pumping and accumulating unit comprises:
the unit accident switching circuit is used for being connected with a live wire at one end and a zero wire at the other end, and is used for being conducted when the accident unit accident is stopped;
one end of the unit non-accident switch circuit is connected with the live wire, and the other end of the unit non-accident switch circuit is connected with the zero line;
the first magnetic-extinction switch breaking coil of the accident unit magnetic-extinction switch is connected in series between the unit accident switching circuit and the zero line;
the second magnetic-killing switch separating coil of the non-accident unit magnetic-killing switch is connected in series between the non-accident unit switching circuit and the zero line;
a unit state monitoring circuit having a first contact, a second contact, a third contact and a fourth contact, wherein the first contact and the second contact are respectively connected with two ends of the first magnetic-killing switch opening coil, the third contact is connected with one end of the unit non-accident switching circuit, and the unit state monitoring circuit is used for respectively conducting the first contact and the second contact, the third contact and the fourth contact when the electric shaft between the accident unit and the non-accident unit is successfully established;
the live monitoring relay is provided with a first contact and a second contact, the first contact is connected with the fourth contact, the second contact is respectively connected with the other end of the unit non-accident switching circuit and the second magnetic-extinction switch switching-off coil, one end of the coil of the live monitoring relay is connected with the second contact, and the other end of the coil is respectively connected with the first magnetic-extinction switch switching-off coil and the zero line;
and the main control circuit is respectively connected with the unit accident switching circuit, the unit non-accident switching circuit and the unit state monitoring circuit.
The back-to-back working condition magnetic switch opening circuit of the pumping and accumulating unit has at least the following beneficial effects:
the interlocking switching-off of the non-accident unit magnetic-killing switch can be implemented only for the accident result that the switching-off coil of the first magnetic-killing switch is electrified through the unit accident switching-off circuit, and the interlocking switching-off of the non-accident unit magnetic-killing switch does not respond to various protection contacts and switching-on contacts respectively, so that the circuit structure can be simplified, the response speed is high, and the reliability is high. The machine set state monitoring circuit and the electrified monitoring relay can lead the accident machine set to stop accident before the electric shaft is not disconnected between the accident machine set and the non-accident machine set, so that after the accident machine set magnetic-extinction switch is disconnected, the non-accident machine set magnetic-extinction switch is disconnected after the interlocking disconnection, the intermediate time difference between the disconnection of the accident machine set magnetic-extinction switch and the disconnection of the non-accident machine set magnetic-extinction switch is the time difference from the electrified monitoring relay to the connection of the non-accident machine set switch circuit, and then the time elapsed after the disconnection of the non-accident machine set magnetic-extinction switch is about 150ms through actual measurement, and the time difference is found by field practice to not cause the great rise of the voltage of a generator and a starting bus to lead to the overvoltage of the machine set or the bus. The back-to-back working condition magnetic switch switching-off circuit of the pumping and accumulating unit can realize synchronous switching-off of the non-accident unit magnetic switch when one unit is stopped in a back-to-back dragging process of the pumping and accumulating unit, and has the advantages of simple circuit structure and high reliability.
According to some embodiments of the utility model, the unit accident switch circuit comprises, in parallel:
the unit electric protection circuit is used for electrically protecting, opening and demagnetizing the magnetic-killing switch of the accident unit after closing;
and the brake-separating instruction stopping circuit is used for responding to the brake-separating instruction to close so as to separate and demagnetize the magnetic-eliminating switch of the accident unit.
According to some embodiments of the utility model, the unit electrical protection circuit comprises a main transformer protection circuit, a generator protection circuit, a main transformer non-electric quantity protection circuit and a short lead protection circuit which are sequentially connected in parallel.
According to some embodiments of the utility model, the brake-off instruction shutdown circuit comprises a main monitoring system de-excitation brake-off instruction circuit, a backup monitoring water machine protection system de-excitation brake-off instruction circuit and an accident shutdown button circuit which are sequentially connected in parallel.
According to some embodiments of the present utility model, the back-to-back working condition magnetic switch opening circuit of the pumping and accumulating unit further includes a first back-to-back working condition switching circuit connected to the main control circuit, one end of the first back-to-back working condition switching circuit is connected to the other end of the unit accident switching circuit, the other end of the first back-to-back working condition switching circuit is connected to the first magnetic switch opening coil and the first contact respectively, and the first back-to-back working condition switching circuit is used for being closed when the accident unit and the non-accident unit are in a back-to-back working condition.
According to some embodiments of the utility model, the back-to-back working condition magnetic switch opening circuit of the pumping and accumulating unit further comprises a second back-to-back working condition switching circuit connected with the main control circuit, one end of the second back-to-back working condition switching circuit is connected with the other end of the non-accident switching circuit of the unit, the other end of the second back-to-back working condition switching circuit is connected with the second magnetic switch opening coil, and the second back-to-back working condition switching circuit is used for being closed when the accident unit and the non-accident unit are in a back-to-back working condition.
According to some embodiments of the utility model, the unit condition monitoring circuit employs a relay.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an electrical axis setup for back-to-back operation of a pumping and accumulating unit according to one embodiment of the present utility model;
FIG. 2 is a schematic diagram of a portion of an embodiment of a back-to-back operating mode magnetic switch opening circuit of a pumping unit;
fig. 3 is a schematic diagram of the contact connection of a live monitoring relay according to an embodiment of the present utility model.
Reference numerals:
a unit electrical protection circuit 110, a brake-off command shutdown circuit 120;
a first demagnetizing switch switching-off coil 200;
the first back-to-back operating mode switching circuit 300.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
The following will clearly and completely describe the back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit according to the embodiments of the present utility model with reference to fig. 1 to 3, and it is obvious that the embodiments described below are some, but not all, embodiments of the present utility model.
The back-to-back working condition magnetic-deactivation switch switching-off circuit of the pumping and accumulating unit is applied to the pumping and accumulating unit, and comprises an accident unit and a non-accident unit which are in back-to-back working conditions, wherein the back-to-back working condition magnetic-deactivation switch switching-off circuit of the pumping and accumulating unit comprises a unit accident switch circuit, a unit non-accident switch circuit, an accident unit magnetic-deactivation switch, a non-accident unit magnetic-deactivation switch, a unit state monitoring circuit, an electrified monitoring relay K1 and a main control circuit.
The unit accident switching circuit is used for being connected with a live wire at one end and a zero wire at the other end, and is used for being conducted when an accident unit is stopped in an accident;
one end of the non-accident switching circuit of the unit is connected with the live wire, and the other end of the non-accident switching circuit of the unit is connected with the zero line;
the first magnetic-extinction switch breaking coil 200 of the magnetic-extinction switch of the accident unit is connected in series between the accident switching circuit and the zero line of the unit;
the second magnetic-killing switch separating coil of the non-accident unit magnetic-killing switch is connected in series between the non-accident unit switching circuit and the zero line;
a unit state monitoring circuit having a first contact, a second contact, a third contact and a fourth contact, the first contact and the second contact being respectively connected to both ends of the first magnetic-extinction switch separating coil 200, the third contact being connected to one end of the unit non-accident switching circuit, the unit state monitoring circuit being adapted to respectively turn on the first contact and the second contact, the third contact and the fourth contact when the establishment of the electric axis between the accident unit and the non-accident unit is successful;
the live monitoring relay K1 is provided with a first contact and a second contact, the first contact is connected with a fourth contact, the second contact is respectively connected with the other end of the non-accident switching circuit of the unit and the switching-off coil of the second magnetic-killing switch, one end of a coil T1 of the live monitoring relay K1 is connected with the second contact, and the other end of the coil is respectively connected with the switching-off coil 200 of the first magnetic-killing switch and a zero line;
the main control circuit is respectively connected with the unit accident switch circuit, the unit non-accident switch circuit and the unit state monitoring circuit.
The unit accident switch circuit comprises a unit electric protection circuit 110 and a brake-separating command stopping circuit 120 which are sequentially connected in parallel. The unit electric protection circuit 110 comprises a main transformer protection circuit, a generator protection circuit, a main transformer non-electric quantity protection circuit and a short lead protection circuit which are sequentially connected in parallel. The brake-off command stopping circuit 120 comprises a main monitoring system de-excitation brake-off command circuit, a water monitoring machine backup protection system de-excitation brake-off command circuit and an accident stopping button circuit which are connected in parallel in sequence. The interlocking switching-off of the non-accident unit magnetic-killing switch can be implemented only for the accident result that the first magnetic-killing switch switching-off coil 200 is electrified by integrating the plurality of protection contacts and the switching-off contacts in parallel, the plurality of protection contacts and the switching-off contacts are not responded respectively, and any protection contact or switching-off contact can be closed to conduct a unit accident switching circuit, so that the first magnetic-killing switch switching-off coil 200 is electrified, the circuit structure can be simplified, the response speed is high, and the reliability is high.
The non-accident unit switching circuit is the non-accident unit LCU in figure 2.
The main control circuit can judge that an electric shaft between the accident unit and the non-accident unit is established after the first dragging knife of the accident unit and the first generator outlet breaker are monitored to be switched on and the second dragging knife of the non-accident unit is switched on, and the accident unit is a dragging unit and the non-accident unit is a dragged unit. If the first dragged knife of the accident unit is monitored to be switched on, and the second dragging knife of the non-accident unit and the outlet breaker of the second generator are switched on, the fact that the electric shaft between the accident unit and the non-accident unit is established is judged, the non-accident unit is the dragging unit, and the accident unit is the dragged unit.
In addition, it should be noted that, if the pumping and accumulating unit has a cross-runner unit, the bus isolation knife is started to close, and the specific principle and connection relationship of the bus isolation knife are known to those skilled in the art, and are not described herein.
The accident unit and the non-accident unit are in a back-to-back working condition, and the main control circuit controls the first contact, the second contact, the third contact and the fourth contact of the unit state monitoring circuit to be conducted after the electric shaft between the accident unit and the non-accident unit is successfully established. When the accident unit is stopped, the unit accident switch circuit is conducted, the first magnetic-killing switch separating coil 200 is electrified, the magnetic-killing switch separating coil of the accident unit is electrified, the coil T1 of the electrified monitoring relay K1 is electrified due to the conduction of the first contact and the second contact, the first contact and the second contact of the electrified monitoring relay K1 are conducted, and the unit non-accident switch circuit is conducted due to the conduction of the third contact and the fourth contact, so that the second magnetic-killing switch separating coil is electrified, and the non-accident unit magnetic-killing switch separating coil is electrified.
It should be noted that, the magnetic switch separating circuit for back-to-back working conditions of the pumping and accumulating unit in the embodiment of the utility model is only for an accident unit, and the pumping and accumulating unit comprises a dragging unit and a dragged unit in back-to-back working conditions, wherein the accident unit can be a dragging unit or a dragged unit, and both units correspond to one magnetic switch separating circuit for back-to-back working conditions of the pumping and accumulating unit. As shown in fig. 2, for a group of the towed unit and the towed unit, there are 4 unit status monitoring circuits, respectively, a BK1 relay and a BK2 relay of the towed unit, and a DK1 relay and a DK2 relay of the towed unit, and the towed unit are independently monitored. BK1 relays are connected in series into a back-to-back working condition magnetic-deactivation switch switching-off circuit 1 of a pumping and storage unit of a dragging unit, and BK2 relays are connected in series into a back-to-back working condition magnetic-deactivation switch switching-off circuit 2 of the pumping and storage unit of the dragged unit; the DK1 relay is connected in series into the back-to-back working condition magnetic-extinction switch switching-off circuit 1 of the pumping and storage unit of the towed unit, and the DK2 relay is connected in series into the back-to-back working condition magnetic-extinction switch switching-off circuit 2 of the pumping and storage unit of the towed unit. When the BK1 relay, the BK2 relay, the DK1 relay and the DK2 relay act, the back-to-back working condition magnetic-killing switch opening circuit 1 and the back-to-back working condition magnetic-killing switch opening circuit 2 of the pumping and storage unit of the dragging unit are in working states, and the back-to-back working condition magnetic-killing switch opening circuit 1 and the back-to-back working condition magnetic-killing switch opening circuit 2 of the pumping and storage unit of the dragged unit are in working states. For the dragging unit, the back-to-back working condition magnetic-extinction switch switching-off circuit 1 of the pumping and storage unit of the dragging unit is controlled by a BK1 relay of the dragging unit, and the back-to-back working condition magnetic-extinction switch switching-off circuit 2 of the pumping and storage unit of the dragging unit is controlled by a DK2 relay of the dragged unit. Similarly, for the towed unit, the back-to-back working condition magnetic-killing switch switching-off circuit 1 of the pumping and accumulating unit of the towed unit is controlled by a DK1 relay of the towed unit, and the back-to-back working condition magnetic-killing switch switching-off circuit 2 of the pumping and accumulating unit of the towed unit is controlled by a BK2 relay of the towed unit. The redundant monitoring loops which coexist in the mutual cross monitoring and the self-monitoring of the dragging unit and the towed unit can be realized through 4 unit state monitoring circuits, and the interlocking between the dragging unit and the towed unit is released only when the electric shaft between the dragging unit and the towed unit is separated, and the unit state monitoring circuits are disconnected.
In addition, it should be noted that the pumping and accumulating unit may include a plurality of groups of dragging units and dragged units in back-to-back working conditions, each group corresponds to 2 unit state monitoring circuits, the plurality of unit state monitoring circuits of the plurality of dragging units are sequentially connected in parallel, and the plurality of unit state monitoring circuits of the plurality of dragged units are sequentially connected in parallel. As shown in fig. 2, for the magnetic switch separating circuit 1 of the pumping and accumulating unit back-to-back working condition of the plurality of dragging units, the plurality of unit state monitoring circuits of the plurality of dragging units are respectively corresponding to BK1, BK3, and BK2n-3; for a magnetic switch separating circuit 2 of a back-to-back working condition magnetic-eliminating switch of a pumping and accumulating unit of a plurality of towed units, a plurality of unit state monitoring circuits of the plurality of towed units are respectively corresponding to BK2, BK4 and BK2n-2; for the back-to-back working condition magnetic-killing switch separating circuit 1 of the pumping and accumulating units of the plurality of dragged units, the plurality of unit state monitoring circuits of the plurality of dragged units are respectively corresponding to DK1, DK3 and DK2n-3, and for the back-to-back working condition magnetic-killing switch separating circuit 2 of the pumping and accumulating units of the plurality of dragged units, the plurality of unit state monitoring circuits of the plurality of dragged units are respectively corresponding to DK2, DK4 and DK2n-2. Through BK1, BK3, BK2n-3, BK2, BK4, BK2n-2, DK1, DK3, DK2n-3, DK2, DK4, DK2n-2, DK2 can realize the redundant monitoring circuit of mutual cross monitoring and native self-monitoring coexistence between the multi-group dragging unit and the dragged unit, only when the electric axis is disconnected between the dragging unit and the dragged unit, the interlocking between the dragging unit and the dragged unit is released when the unit state monitoring circuit is disconnected. The principle is the same as that of the 4 unit condition monitoring circuits mentioned above, and a detailed description thereof will be omitted. The back-to-back working condition magnetic switch opening circuit of the pumping and accumulating unit has high expandability.
According to the back-to-back working condition magnetic switch switching-off circuit of the pumping and accumulating unit, the interlocking switching-off of the non-accident unit magnetic switch can be implemented only for the accident result that the first magnetic switch switching-off coil 200 is electrified through the unit accident switching-off circuit, and the interlocking switching-off circuit does not respond to various protection contacts and switching-on contacts respectively, so that the circuit structure can be simplified, the response speed is high, and the reliability is high. The machine set state monitoring circuit and the live monitoring relay K1 can lead the accident machine set to stop before the electric shaft between the accident machine set and the non-accident machine set is not disconnected, so that after the accident machine set magnetic-extinction switch is disconnected, the non-accident machine set magnetic-extinction switch is connected by interlocking to disconnect the interlocking, the middle time difference between the disconnection of the accident machine set magnetic-extinction switch and the disconnection of the non-accident machine set magnetic-extinction switch is the time that the live monitoring relay K1 is electrified to the non-accident machine set switch circuit to be conducted, and the time elapsed until the non-accident machine set magnetic-extinction switch is disconnected is about 150ms through actual measurement, and the time difference is found by field practice and does not cause the great rise of the voltage of a generator and a starting bus to lead to the overvoltage of the machine set or the bus. The back-to-back working condition magnetic switch switching-off circuit of the pumping and accumulating unit can realize synchronous switching-off of the non-accident unit magnetic switch when one unit is stopped in a back-to-back dragging process of the pumping and accumulating unit, and has the advantages of simple circuit structure and high reliability.
In some embodiments of the present utility model, referring to FIG. 2, the crew fault switching circuit includes a crew electrical protection circuit 110 and a brake off command shutdown circuit 120 connected in series. The unit electrical protection circuit 110 is used for electrically protecting, opening and demagnetizing the magnetic extinction switch of the accident unit after being closed; the switching-off command stopping circuit 120 is used for closing in response to the switching-off command so as to switch off and demagnetize the magnetic-killing switch of the accident unit. The unit electric protection circuit 110 comprises a main transformer protection circuit (i.e. a main transformer A-set protection sub-magnetic extinction switch in fig. 2), a generator protection circuit (i.e. a generator A-set protection sub-magnetic extinction switch in fig. 2), a main transformer non-electric quantity protection circuit (i.e. a main transformer C-set non-electric quantity protection sub-magnetic extinction switch in fig. 2) and a short lead protection circuit (i.e. a short lead A-set protection sub-magnetic extinction switch in fig. 2) which are sequentially connected in parallel. The brake-off command shutdown circuit 120 comprises a monitoring main system de-excitation brake-off command circuit (i.e. a monitoring main PLC FCB brake-off command in fig. 2), a monitoring water machine backup protection system de-excitation brake-off command circuit (i.e. a monitoring water machine PLC FCB brake-off command in fig. 2), and an accident shutdown button circuit (i.e. an electric accident shutdown button and an emergency accident shutdown button in fig. 2) which are sequentially connected in parallel. The interlocking switching-off of the non-accident unit magnetic-killing switch can be implemented only for the accident result that the first magnetic-killing switch switching-off coil 200 is electrified by integrating the plurality of protection contacts and the switching-off contacts in parallel, the plurality of protection contacts and the switching-off contacts are not responded respectively, and any protection contact or switching-off contact can be closed to conduct a unit accident switching circuit, so that the first magnetic-killing switch switching-off coil 200 is electrified, the circuit structure can be simplified, the response speed is high, and the reliability is high.
It should be noted that, as shown in fig. 2, the unit accident switch circuit includes, but is not limited to, the unit electric protection circuit 110 and the opening command shutdown circuit 120 mentioned above, and further more protection contacts and opening contacts can be extended, so that the versatility is strong and the extension degree is high.
In some embodiments of the present utility model, referring to fig. 1 and 2, the back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit further includes a first back-to-back working condition switching circuit 300 connected to the main control circuit, one end of the first back-to-back working condition switching circuit 300 is connected to the other end of the unit accident switching circuit, the other end is respectively connected to the first magnetic switch separating coil 200 and the first contact, and the first back-to-back working condition switching circuit 300 is used for closing when the accident unit and the non-accident unit are in back-to-back working condition. The first back-to-back working condition switch circuit 300 comprises a back-to-back relay K2 and a generator outlet breaker brake-off contact (GCB brake-off position) which are sequentially connected in parallel, if the accident unit is a dragging unit, the back-to-back relay K2 is closed, otherwise, the generator outlet breaker brake-off contact is closed, the first magnetic-killing switch brake-off coil 200 can be electrified, and therefore the non-accident unit magnetic-killing switch interlocking brake-off is realized after the accident unit accident shutdown causes the accident unit magnetic-killing switch brake-off. The first back-to-back working condition switching circuit 300 can ensure that the back-to-back working condition magnetic-killing switch switching circuit of the pumping and storage unit operates on the premise that the back-to-back working condition switching circuit is positioned between the accident unit and the non-accident unit, ensure that the back-to-back working condition magnetic-killing switch switching circuit of the pumping and storage unit solves the defect that the unit is out of synchronization in the back-to-back working condition, and further improve reliability.
In some embodiments of the present utility model, referring to fig. 1 and 2, the back-to-back working condition magnetic switch switching circuit of the pumping and accumulating unit further includes a second back-to-back working condition switching circuit connected with the main control circuit, one end of the second back-to-back working condition switching circuit is connected with the other end of the non-accident switching circuit of the unit, the other end of the second back-to-back working condition switching circuit is connected with the second magnetic switch switching coil, and the second back-to-back working condition switching circuit is used for being closed when the accident unit and the non-accident unit are in back-to-back working condition. For a group of dragging units and a group of dragged units, the device further comprises a third back-to-back working condition switch circuit and a fourth back-to-back working condition switch circuit, the first back-to-back working condition switch circuit 300, the second back-to-back working condition switch circuit, the third back-to-back working condition switch circuit and the fourth back-to-back working condition switch circuit correspond to the back-to-back working condition magnetic switch opening circuit 1 of the pumping unit of the dragging unit, the back-to-back working condition magnetic switch opening circuit 2 of the pumping unit of the dragged unit, the back-to-back working condition magnetic switch opening circuit 1 of the pumping unit of the dragged unit and the back-to-back working condition magnetic switch opening circuit 2 of the pumping unit of the dragging unit respectively, and specific connection relations and principles refer to the description of the first back-to working condition switch circuit 300.
In some embodiments of the present utility model, referring to FIG. 2, the unit condition monitoring circuit employs a relay. When the control signal of the multi-contact relay reaches a certain value, the multi-circuit can be simultaneously switched on, switched off and switched on according to different forms of the contact group, and the control range can be enlarged. The unit status monitoring circuit may be any other switching circuit as long as the corresponding function is realized, and is not to be construed as limiting the present utility model.
In order to better illustrate the advantages of the back-to-back working condition magnetic switch opening circuit of the pumping and storage unit in the embodiment of the utility model, a specific embodiment is described below.
When the accident unit is stopped in accident, namely, any normally open contact between the joints XFL1-1 and XFL1-2 in the figure 2 is closed, and when the accident unit and the non-accident unit are in back-to-back working condition, the accident unit is used as a dragging unit, the back-to-back relay K2 acts, or is used as a dragged unit, and the outlet breaker of the generator is in a brake-separating state. So that the parallel connection points between the joints XFL1-2 and XFL1-3 are always all closed. Therefore, the XFL1-1 and the XFL1-4 are conducted, the coil T1 of the electrified monitoring relay K1 is electrified at the same time when the first magnetic-extinction switch opening coil 200 is electrified, normally open contacts 1 and 4 of the electrified monitoring relay K1 are closed in FIG. 3, the XB1-1 and the XB1-2 are conducted, and the contacts are connected into XD1-1 and XD1-2 of a non-accident unit through inter-cabinet wires to conduct. XD1-1 and XD1-2 in a control cabinet (LCU) of the non-accident unit are used as BTB combined magnetic-eliminating switch signal input joints of other units, wherein the joints XD1-1 are connected with XFL1-1, XD1-2 are connected with XFL1-2, so that the XFL1-1 and XFL1-4 of the non-accident unit are conducted, the second magnetic-eliminating switch separating coil of the non-accident unit magnetic-eliminating switch is electrified, and the electrified action of the first magnetic-eliminating switch separating coil 200 is realized, and then the electrified action of the second magnetic-eliminating switch separating coil is linked. For both the dragging unit and the dragged unit, the actions of the above process will be generated, and will not be described herein.
As long as the electric shaft between the accident unit and the non-accident unit is not separated, the magnetic-extinction switch separating circuit of the back-to-back working condition of the 4 pumping and accumulating units is still in a working state. The preceding steps will form a reciprocating cycle and be in a hold state. Thereby realizing the interlocking of the electrified states of the first and second magnetic-extinction switch opening coils 200 and 200 when the electric shaft is not disconnected.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (7)
1. The utility model provides a take out and hold unit back-to-back operating mode magnetic switch brake separating circuit, is applied to take out and hold the unit, take out and hold the unit including being in accident unit and the non-accident unit of back-to-back operating mode, its characterized in that, take out and hold unit back-to-back operating mode magnetic switch brake separating circuit includes:
the unit accident switching circuit is used for being connected with a live wire at one end and a zero wire at the other end, and is used for being conducted when the accident unit accident is stopped;
one end of the unit non-accident switch circuit is connected with the live wire, and the other end of the unit non-accident switch circuit is connected with the zero line;
the first magnetic-extinction switch breaking coil of the accident unit magnetic-extinction switch is connected in series between the unit accident switching circuit and the zero line;
the second magnetic-killing switch separating coil of the non-accident unit magnetic-killing switch is connected in series between the non-accident unit switching circuit and the zero line;
a unit state monitoring circuit having a first contact, a second contact, a third contact and a fourth contact, wherein the first contact and the second contact are respectively connected with two ends of the first magnetic-killing switch opening coil, the third contact is connected with one end of the unit non-accident switching circuit, and the unit state monitoring circuit is used for respectively conducting the first contact and the second contact, the third contact and the fourth contact when the electric shaft between the accident unit and the non-accident unit is successfully established;
the live monitoring relay is provided with a first contact and a second contact, the first contact is connected with the fourth contact, the second contact is respectively connected with the other end of the unit non-accident switching circuit and the second magnetic-extinction switch switching-off coil, one end of the coil of the live monitoring relay is connected with the second contact, and the other end of the coil is respectively connected with the first magnetic-extinction switch switching-off coil and the zero line;
and the main control circuit is respectively connected with the unit accident switching circuit, the unit non-accident switching circuit and the unit state monitoring circuit.
2. The back-to-back working condition magnetic switch opening circuit of the pumping and accumulating unit according to claim 1, wherein the unit accident switch circuit comprises the following components in parallel connection in sequence:
the unit electric protection circuit is used for electrically protecting, opening and demagnetizing the magnetic-killing switch of the accident unit after closing;
and the brake-separating instruction stopping circuit is used for responding to the brake-separating instruction to close so as to separate and demagnetize the magnetic-eliminating switch of the accident unit.
3. The back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit according to claim 2, wherein the unit electric protection circuit comprises a main transformer protection circuit, a generator protection circuit, a main transformer non-electric quantity protection circuit and a short lead protection circuit which are sequentially connected in parallel.
4. The back-to-back working condition magnetic switch switching-off circuit of the pumping and accumulating unit according to claim 2, wherein the switching-off instruction switching-off circuit comprises a monitoring main system de-excitation switching-off instruction circuit, a monitoring water machine backup protection system de-excitation switching-off instruction circuit and an accident shutdown button circuit which are sequentially connected in parallel.
5. The back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit according to claim 1, wherein the back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit further comprises a first back-to-back working condition switch circuit connected with the main control circuit, one end of the first back-to-back working condition switch circuit is connected with the other end of the unit accident switch circuit, the other end of the first back-to-back working condition switch circuit is respectively connected with the first magnetic switch separating coil and the first contact, and the first back-to-back working condition switch circuit is used for being closed when the accident unit and the non-accident unit are in a back-to-back working condition.
6. The back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit according to claim 1, wherein the back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit further comprises a second back-to-back working condition switch circuit connected with the main control circuit, one end of the second back-to-back working condition switch circuit is connected with the other end of the unit non-accident switch circuit, the other end of the second back-to-back working condition switch circuit is connected with the second magnetic switch separating coil, and the second back-to-back working condition switch circuit is used for being closed when the accident unit and the non-accident unit are in a back-to-back working condition.
7. The back-to-back working condition magnetic switch separating circuit of the pumping and accumulating unit according to claim 1, wherein the unit state monitoring circuit adopts a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321230078.3U CN219697294U (en) | 2023-05-19 | 2023-05-19 | Back-to-back working condition magnetic switch opening circuit of pumping and storage unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321230078.3U CN219697294U (en) | 2023-05-19 | 2023-05-19 | Back-to-back working condition magnetic switch opening circuit of pumping and storage unit |
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| Publication Number | Publication Date |
|---|---|
| CN219697294U true CN219697294U (en) | 2023-09-15 |
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|---|---|---|---|
| CN202321230078.3U Active CN219697294U (en) | 2023-05-19 | 2023-05-19 | Back-to-back working condition magnetic switch opening circuit of pumping and storage unit |
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| Country | Link |
|---|---|
| CN (1) | CN219697294U (en) |
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2023
- 2023-05-19 CN CN202321230078.3U patent/CN219697294U/en active Active
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