KR101301963B1 - Connecting mold having high safety grounding - Google Patents

Abstract

PURPOSE: A connecting bushing with reinforced ground stability is provided to perform contraction according to a temperature change by supplying a low resistance value. CONSTITUTION: A connecting bushing includes a bus connection conductor, an insulating tube, a sealing cap, and a spring contactor. The connecting bushing is prepared within tanks (11,12) for charging insulating gas, and is installed to connect a bus (15). The bus connection conductor passes through the tank, and connects both end parts so that the bus can be connected. The insulating tube is formed with insulating material, and maintains an insulated state between the bus connection conductor and the internal wall of the tank. The sealing cap is connected to a bus bar, and seals each tank. The spring contactor electrically connects the bus connection conductor and the bus bar connection terminal of the sealing cap, and absorbs contraction corresponding to a temperature change and an assembling tolerance during the connection process.

Description

Connecting Mold having High Safety Grounding

The present invention relates to a bushing for nirvana with enhanced ground stability, and more particularly, by applying a spring-type contactor, which is simple to install, to provide a low resistance value in the electrical path while shrinking due to assembly tolerance or temperature change at the time of nirvana. The present invention relates to a bushing for heat sinks having enhanced ground stability that can be absorbed and automatically grounded to the switchboard enclosure by an earthing protrusion ring integrally formed with an insulating tube.

In general, the switchboard is a device for monitoring, controlling and protecting the electric system in the process of receiving and distributing electric power sent from power plants and substations mainly to high voltage consumers.

Such a switchgear is composed of a structure for attaching, supporting and protecting unit devices such as a circuit breaker, a protective relay and a meter, and an assembly of wires connecting and connecting the same. The switchgear is generally classified into a gas insulated switchgear and an air insulated switchgear according to its insulation method.

The switchboards are arranged nirally with each other, that is, arranged in parallel with each other to branch the power supplies to different loads. At this time, the plurality of switchboards arranged to be nirvana should be electrically connected to each other. To this end, the plurality of switchboards are provided with connection bushings for electrical connection in the areas in contact with each other. The connection bushing is essentially provided in the gas insulated switchboard, but some of the air insulated switchboards have connection bushings, and some switchboards penetrate the bus without connecting bushings.

1 is a view for briefly explaining the configuration of a gas insulated switchgear according to an embodiment of the prior art.

Referring to FIG. 1, the gas insulated switchgear 10 includes a VCB panel 11, a PT panel 12, a MOF panel 13, and an LBS panel 14 having a cubicle-shaped tank. Breakers, disconnectors, instrument transformers, and the like are built into the panels 11, 12, 13, and 14.

In addition, the gas insulated switchboard 10 is fed by a power receiving cable, and each panel 11, 12, 13, 14 is provided with buses 15 for connecting the converters, respectively, and the panels 11, 12. , 13 and 14 are filled with SF6 gas for internal insulation.

Here, the bus bar 15 is mainly manufactured in the form of a rectangular bar or a round rod using copper or aluminum. Accordingly, when the switchboards are to be connected to each other, the bus bars 15 of the switchboards are connected to the bushing 16. Each switchboard is configured to be energized by combining with each other.

As a prior art document, Korean Patent No. 854592 discloses a technical content of a gas insulated switchgear.

The conventional gas insulated switchgear is provided to be sealed to the outside inside the switchgear, the center portion is formed so that the one end is connected to the horizontal bus bar and the other end is formed to maintain the air-tight connection conductor for drawing out the current One end of the lead-out portion and the other end of the lead-out connection conductor which is connected to the lead-out portion, and is connected and detachably connected to one end of the lead-out portion, to which the current can be applied; The inlet is provided with an inlet connection conductor connected to and connected by pressurization, and an inlet part which is sealably provided to the outside on one side of an upper end of another distribution panel, and both ends of the inlet part and the inlet part are formed to be insertable, respectively. Insulation is provided to reduce the electric field is grounded with the connection conductor for the lead-in portion Made parts.

As a prior art document, Korean Patent Publication No. 2003-0070779 discloses a technical content of a panel assembly apparatus for a gas insulated switchgear.

Conventional gas insulated switchgear panel assembly apparatus includes a bushing part for nipping into the tank so that electric current is drawn in / out, a disconnecting part for shorting the bushing part and the bus bar part, and a bus bar part formed through both walls of the tank. A gas insulated switchgear including a tank of each panel and a contact portion for nipping the nirvana bushing portion of the tank to assemble a plurality of panels including tanks each having nirvana bushing portions on both sides for nipping each bus bar portion. A panel assembly for a device, comprising: a spacer having both ends inserted into a heat sink of each tank to form a conductor for nipping each bus bar, and an insulator for air insulation along its outer circumferential surface; At least one contact assembly for elastic grounding is inserted and fixed between the inner peripheral surface of both ends of the conductor and the outer peripheral surface of the busbar nib inserted into and fixed to the inner peripheral surface so that the contact unit is integrally fastened and fixed so that the contact portion is connected to the conductor, the insulator, and the contact assembly. It is easy to assemble the unit and the panel of each panel and the hot plate assembly of the tank, can be used in large capacity by increasing or decreasing the number of hot water of the contact assembly assembled according to the power supply capacity.

However, the conventional gas insulated switchgear and panel assembly device for gas insulated switchgear has a problem that the insulating member, such as the grounding member and the insulating member, insulator, etc. are separate, so that the work is cumbersome and the manufacturing cost increases.

Korea Patent Registration No. 10-854592

Korean Patent Publication No. 10-2003-0070779

The present invention provides a low resistance value in the electrical path by applying a spring-type contactor, which is simple to install, can absorb shrinkage due to assembly tolerance or temperature change at the time of hot vaning, and is provided in a grounding protruding ring integrally formed with an insulating tube. It is automatically grounded to the switchboard enclosure to improve stability, and a semi-conductive paint is applied to the inside of the silicone insulation tube to reduce the electric field concentration and to prevent the occurrence of partial discharge, and the nirvana is enhanced. Provide bushings for

Among the embodiments, the nibble bushing with enhanced grounding stability is provided in a horizontal state inside the tank filling the insulating gas, and penetrates the inside of each tank in the nibble bushing for nipping the bus bar connecting the converter. Bus bar connecting conductors for connecting both ends of the bus bar so that the bus bars are separated from each other; An insulation tube having the bus bar connection conductor inserted into and fixed to the outer circumferential surface of the ground protrusion ring which is automatically grounded to the enclosure, and formed of an insulating material to maintain insulation between the bus bar connection conductor and the tank inner wall; It is fixed to the left side wall and the right side wall of each tank at both ends of the insulation tube so that each tank is sealed to the outside, and the bus bus bar is connected to the bus bar connecting terminal through the bus bar connecting terminal protruding to the outside and at the same time Sealing cap; And at least one spring contactor which energizes the busbar connecting terminal of the sealing cap and the bus bar connecting conductor and absorbs shrinkage due to the assembly tolerance or temperature change at the time of hot platen.

In this case, the bus bar connection conductor may be chamfered to insert the outer diameter portion of the spring contactor therein. The ground protruding ring is applied with a semiconductive paint.

The insulating tube has a convex portion which becomes convex toward both sides from its side, and a protruding ring for grounding is formed on the convex portion, and a semiconductive paint is applied therein.

The busbar connection terminal has a screw hole formed at one end thereof so as to connect the busbar busbar, and an assembly groove is formed at the other end thereof to assemble the spring contactor.

The sealing cap is formed with a bracket formed with a screw hole to be screwed to each tank.

When one busbar connection terminal of the sealing cap is used for pulling in, the other busbar connecting terminal may be used for drawing out.

In one embodiment, the thermal stability bushing for strengthening the grounding, at least one high-voltage shield is formed so that one end is in contact with the bus bar connecting conductor, the other end is bent so as to be spaced apart from the outer peripheral surface of the insulating tube by a certain distance; And at least one ground shield, one end of which is in contact with the screw hole of the bracket and the other end of which is formed to maintain a distance of at least a predetermined distance from the high voltage shield.

The thermally stable bushing of the present invention provides a low resistance value in the electrical path by applying a spring-type contactor, which is simple to install, while absorbing shrinkage due to assembly tolerance or temperature change at the same time. Due to the current carrying capacity and the number of contact points, the contact state can be stably maintained, and the grounding protrusion ring formed integrally with the insulating tube can be automatically grounded to the switchboard enclosure to improve stability.

In addition, the present invention is formed so that the insulation tube is wrapped around the bus connecting conductor made of silicon material having excellent insulation power to ensure the insulation distance and insulation of the bus connecting conductor in the air, and the electric field concentrated by applying a semi-conductive paint on the inside It provides an effect that can alleviate and suppress the occurrence of partial discharge.

1 is a view for briefly explaining the configuration of a bus chamber of a gas insulated switchgear according to an embodiment of the prior art.
FIG. 2 is a front perspective view illustrating a bushing for nirvana having enhanced ground stability according to an embodiment of the present invention. FIG.
Figure 3 is a perspective view from above of the nibble bushing with enhanced ground stability according to an embodiment of the present invention.
4 is an exploded front view illustrating a bushing for nirvana with enhanced ground stability according to an embodiment of the present invention.
FIG. 5 is a plan view illustrating a bushing for nirvana having improved ground stability according to an embodiment of the present invention. FIG.
6 is a cross-sectional view illustrating a bushing for nirvana having enhanced ground stability according to an embodiment of the present invention.
FIG. 7 is a front view illustrating a process of coupling the bushing for nirvana with enhanced ground stability according to an embodiment of the present invention to the first tank. FIG.
FIG. 8 is a perspective view illustrating a process of coupling the bushing for nirvana with enhanced ground stability according to an embodiment of the present invention to the second tank. FIG.
FIG. 9 is a front view illustrating a process of coupling the bushing for nirvana with enhanced ground stability according to an embodiment of the present invention between the first panel and the second panel. FIG.
FIG. 10 is a perspective view illustrating a process of coupling a bushing for nirvana with enhanced ground stability according to an embodiment of the present invention between the first panel and the second panel. FIG.

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

Meanwhile, the meaning of the terms described in the present invention should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

It is to be understood that the singular " include " or "have" are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present invention.

FIG. 2 is a front perspective view illustrating a nirvana bushing with enhanced ground stability according to an embodiment of the present invention, and FIG. 3 is a perspective view of the nirvana bushing with enhanced ground stability according to an embodiment of the present invention. FIG. 4 is an exploded front view illustrating a bushing for a nirvana with enhanced ground stability according to an embodiment of the present invention, and FIG. 5 illustrates a bushing for a nirvana with enhanced ground stability according to an embodiment of the present invention. 6 is a cross-sectional view illustrating a bushing for nirvana with enhanced ground stability according to an embodiment of the present invention.

2 to 6, the ground stability is provided in a horizontal state inside the tank filling the inert (SF6) gas (or nitrogen gas, may be used dry air) to heat the bus bar connecting the converter This reinforced nirvana bushing 100 includes a busbar connecting conductor 110, an insulation tube 120, a sealing cap 130 and a spring contactor 140.

The bus bar connecting conductor 110 connects and connects both ends of the bus bar for nirvana so that the buses penetrate each other through the inside of each tank. The bus bar connection conductor 110 is chamfered in the 'V' groove so that the spring contactor 140 is inserted into the outer diameters of both ends, and the spring contactor 140 is smoothly inserted.

The insulation tube 120 is formed of a silicon material to surround the bus connection conductor 110 when the bus connection conductor 110 is exposed to the air and is formed of a silicon material having excellent insulation to ensure an insulation distance and insulation in the air. do.

The insulating tube 120 has a convex portion which becomes convex toward both sides from its both sides, and a grounding protruding ring 121 is formed integrally on the outer side of the convex portion. At this time, the grounding protruding ring 121 is coated with a semi-conductive paint, and can be automatically grounded to the enclosure of the gas insulated switchgear to improve stability.

On the other hand, the insulating tube 120 is applied to the inside of the semi-conductive paint to alleviate the electric field concentration to prevent forced deterioration due to the electric field concentration as well as to suppress the occurrence of partial discharge.

The insulation tube 120 has an elastic force to be in close contact with the outer circumferential surface of the bus bar connection conductor 110 while maintaining insulation between the bus bar connection conductor 110 and the tank inner wall.

The sealing cap 130 is fixed to the left side wall and the right side wall of each tank at both ends of the insulating tube 120 so that each tank is sealed with the outside. The inside of the silane cap 130 is formed of an epoxy mold.

The sealing cap 130 is connected to the bus bar connecting conductor 110 therein while connecting the bus bar bus bar through the bus bar connecting terminal 131 protruding to the outside. In addition, the sealing cap 130 processes six screw holes 132a around the outer diameter protrusion to enable screw fastening, and the screw holes 132a are formed by mounting insert molding. Sealing cap 130 has two brackets 132 on each side of the insulating tube 120, each bracket 132 is sealed by O-ring (134).

Meanwhile, the busbar connecting terminal 131 has two screw holes formed at one end thereof so that busbar busbars are directly connected to each other, and the spring contact 140 is easily assembled at the other end thereof, and at the same time, the assembling groove ( 133 is formed.

It is preferable that the sealing cap 130 is formed of an insulating material except for the busbar connection terminal 131.

The spring contactor 140 is provided between the busbar connecting terminal 131 and the bus bar connecting conductor 110 to conduct electricity between the outside of the busbar connecting terminal 131 and the inside of the bus bar connecting conductor 110. The spring contactor 140 may be formed of two or more, can be simply installed, and can perform a mechanical and thermally stable energization function.

In addition, the spring contactor 140 provides a low resistance value on the electrical path due to the high current carrying capacity and the number of contact points, and provides an elastic force capable of absorbing shrinkage due to assembly tolerances or temperature changes in the bus bar.

FIG. 7 is a front view illustrating a process of coupling the bushing for the nirvana with enhanced ground stability according to an embodiment of the present invention to the first tank, and FIG. 8 is a nirvana with enhanced ground stability according to an embodiment of the present invention. A perspective view illustrating the process of coupling the bushing to the second tank.

Referring to FIGS. 7 and 8, the nirvana bushing 100 allows the bus bars penetrating both side walls of the first tank 11 and the second tank 12 to penetrate each other, and the nirvana bushing 100 and the busbar A disconnector (not shown) may be provided to short the circuit.

In general, a variety of devices or instruments such as switchgear, fuse link, lightning arrester, transformer transformer and breaker for the instrument are installed inside the switchboard, and the inside of the instrument panel is composed of several compartments to protect these instruments. Each of these compartments is identified by a panel installed inside the switchboard.

The nirvana bushing 100 is inserted into the through holes on both sides of the first tank 11 and the second tank 12 to maintain airtightness, and insulation gas is injected into the tanks 11 and 12 to provide a single panel. It is composed. Therefore, since the first tank 11 is composed of the first panel 11a and the second tank 12 is composed of the second panel 12a, the bushing 100 for the nirvana may be formed of the first panel 11a and the first panel 11a. 2 panel 12a is connected.

In the state where the housing of the nirvana bushing 100 is assembled inside the first panel 11a, the screw is fastened to the first panel 11a, and the spring contactor 140 is connected to the busbar connecting terminal 131. Apply a thin layer of conductive grease to the assembling groove 133, and then assemble it.

At this time, the nirvana bushing 100 is aligned with the six screw holes formed in the bracket 132 to the stud bolts pre-installed in the first panel 11a, and then assembled by using nuts and washers. .

Thereafter, the spring contactor 140 is inserted after applying the conductive grease to the 'V' groove portion chamfered to the outer diameter of the bus bar connection conductor 110. After assembling the bus bar connection conductor 110 in the assembled state up to the spring contactor 140, the insulation tube 120 is inserted into the outer diameter side of the bus bar connection conductor 110 and assembled.

The insulating tube 120 is coated with an insulating silicone grease on the outside, and connects the bus bar connecting conductor 110 therein, and its outer circumferential surface is in close contact with the inside of the housing of the nirvana bushing 100 to generate a gap in the insulating surface. In this case, the busbar connection terminal 131 of the sealing cap 130 located at both ends of the nirvana bushing 100 is used for withdrawal when the other side is used for withdrawal.

Similarly to the first tank 11, the second tank 12 may also assemble the nirvana bushing 100 to the second panel 12a.

FIG. 9 is a front view illustrating a process of coupling the bushing for nirvana having enhanced grounding stability according to an embodiment of the present invention between the first panel and the second panel, and FIG. 10 according to an embodiment of the present invention. A perspective view illustrating a process of coupling the bushing for nirvana with enhanced ground stability between the first panel and the second panel.

9 and 10, the inlet busbar connection terminal 131 is connected to the inner side of the first panel 11a, and after the screw 132 is screwed in, the insulating tube of the bushing 100 for nirvana ( In a state where 120 is assembled, the second panel 12a is positioned in a straight line to correspond to the exact position of the first panel 11a.

After applying a thin layer of conductive grease to the assembling groove 133 of the pull-out busbar connecting terminal 131 connected to the inside of the second panel 12a, assembling the spring contactor 140 and using a chain block or the like The second panel 12a to be positioned is moved in the direction of the first panel 11a.

The nirvana is completed in place using a bolt and a liner in the nirvana hole located on the upper surface of the nirvana of the first panel 11a and the second panel 12a.

In this manner, the nirvana bushing 100 is mounted on a stud bolt inside the tanks 11 and 12, and an O-ring surface is machined on the contact surfaces of the tanks 11 and 12 to provide a gas tight state of the gas insulated switchgear. I can keep it.

In addition, the nirvana bushing 100 is assembled to the first panel 11a and the second panel 12a, and then the earthing protrusion ring 121 protrudes to the outside, and the earthing protrusion ring 121 is a switchboard enclosure. It can be grounded automatically to enhance grounding stability.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

10: gas insulated switchboard 11, 12, 13, 14: panel
100: bushing for nirvana 110: bus bar connection conductor
120: insulated tube 121: protruding ring for grounding
130: sealing cap 131: busbar connection terminal
132: bracket 133: assembly groove
140: spring contactor

Claims (8)

In the nibble bushing for nibbling the bus bar connecting the converter is provided in a horizontal state inside the tank filling the insulating gas,
A bus bar connecting conductor connecting the both ends to penetrate the inside of each tank so that the bus bars are nibbled with each other;
An insulation tube having the bus bar connection conductor inserted into and fixed to the outer circumferential surface of the ground protrusion ring which is automatically grounded to the enclosure, and formed of an insulating material to maintain insulation between the bus bar connection conductor and the tank inner wall;
It is fixed to the left side wall and the right side wall of each tank at both ends of the insulation tube so that each tank is sealed to the outside, and the bus bus bar is connected to the bus bar connecting terminal through the bus bar connecting terminal protruding to the outside and at the same time Sealing cap; And
The grounding plate with enhanced ground stability, comprising at least one spring contactor which energizes the busbar connecting terminal of the sealing cap and the bus bar connecting conductor and absorbs shrinkage due to assembly tolerance or temperature change at the time of hot platen. Bushings.
The method of claim 1,
The bus bar connection conductor is grounded bushing for enhanced ground stability, characterized in that the chamfering process so that the outer diameter portion of the spring contactor is inserted into the inside. The method of claim 1,
The grounding protruding ring is a bubbling bush for strengthening the grounding stability, characterized in that coated with a semi-conductive paint.
The method of claim 1,
The insulating tube has a convex portion which becomes convex toward both centers from both sides thereof, a protruding ring for grounding is formed on the convex portion, and semi-conductive paint is applied to the inner side of the thermal stability bushing for strengthening grounding. .
The method of claim 1,
The bus bar connection terminal has a screw hole formed at one end thereof so that the busbar bus bar is connected, and at the other end, an assembly groove is formed to assemble the spring contactor.
The method of claim 1,
The sealing cap bushing for strengthening the ground stability, characterized in that the bracket is formed with a screw hole is formed so as to screw the respective tanks.
The method of claim 1,
When the one side busbar connection terminal of the sealing cap is used for pulling in, the other side busbar connecting terminal is used for drawing out, the thermal stability bushing for strengthening the ground.
The method according to claim 6,
At least one high voltage shield, one end of which is in contact with the bus bar connecting conductor and the other end of which is bent so as to be spaced apart from the outer circumferential surface of the insulating tube by a specific distance; And
And at least one ground shield, the one end of which is in contact with the screw hole of the bracket and the other end of which is formed to maintain a distance greater than a certain distance from the high voltage shield.

Images