KR101231766B1 - Gas insulated switch-gear - Google Patents

Abstract

PURPOSE: A gas insulated switchgear is provided to arrange the current transformer in the back and front of the breaker, thereby solving easily the limitations on the installation space. CONSTITUTION: A breaker(310) protects the line or main apparatus. A breaker comprises a breaker driving unit(312) and a gas insulated bus unit(320) comprises a bus line inside the container. A gas insulated bus unit electrically connects the bus line between the apparatuses. The first bus line(330) comprises a first disconnecting switch(332) and the first grounding switch(334). A first bus line is connected to a first host bus(600a). The first bus line opens/closes the gas insulated switchgear(300). A second bus line(340) is connected to a second host bus(600b). The second bus line comprises a second disconnecting switch(342) and a second grounding switch(344). A switch for line(350) opens/closes the gas insulated switchgear. The switch for line comprises a third disconnecting switch(352) and a third grounding switch(354). The switch for line additionally comprises a grounding switch for line(356). A cable head(360) connects a high pressure processing power cable and underground power cable. A transformer(370) is connected to the cable head. A first current transformer(380) measures the size of the current flowing between the breaker and the switch for the line. A second current transformer(390) measures the size of the current flowing between the first bus line and the second bus line. A gas insulated bus unit is connected to one side of the second current transformer. The first bus line and the second bus line are connected to the upper end of the gas insulated bus unit.

Description

Gas Insulated Switchgear {GAS INSULATED SWITCH-GEAR}

The present application relates to a gas insulated switchgear, and more particularly, to a gas insulated switchgear having a structure in which a current transformer is disposed at the front and rear ends of the circuit breaker.

Gas Insulated Switchgear (GIS) fills SF ₆ gas with excellent insulation and extinguishing characteristics by embedding breakers, disconnectors, ground breakers, transformers, current transformers, main busbars and branch busbars in grounded metal tanks. As a product, it is a power switchgear with advantages such as miniaturization of substation, improvement of safety and reliability, easy operation and maintenance inspection, and harmony with environment.

As shown in FIG. 1, the three-phase storage type gas insulated switchgear 100 includes a circuit breaker 110, a current transformer 120, a circuit breaker driver 130, a first bus bar 140, a second bus bar 150, The line switch 160 includes a cable head 170 and a transformer 180. In the gas insulated switchgear 100, the current transformer 120 is connected only to the rear end of the circuit breaker 110, and the first bus bus 140 and the second bus bus 150 are connected to the front end of the circuit breaker 110.

2 is a circuit diagram of a conventional gas insulated switchgear 100, a current transformer 120 is connected between the line switch 160 and the circuit breaker 110. The first bus bar 140 and the second bus bar 150 may be directly connected to the circuit breaker 110 to transmit current to the first main bus bar 190a and the second main bus bar 190b.

The related technology is disclosed in Japanese Laid Open Patent Application 2002-165320.

The present application provides a circuit breaker and current transformer arrangement technology that can freely use the installation space in the installation of the gas insulated switchgear, free from constraints of the installation space.

Among the embodiments, the gas insulated switchgear in the gas insulated switchgear comprising a circuit breaker, the first bus bar, the second bus bar, the line switch, transformer, cable head, gas insulated bus unit, the first current transformer and the second current transformer. And a current path for electrically connecting the first bus bar connected to the first main bus bar and the second bus bar connected to the second main bus bar, wherein a front end of the second current transformer is formed at a rear end of the gas insulated bus bar part. The first bus bar and the second bus bar are symmetrically connected to upper and lower ends of the gas insulated bus bar, respectively, and the second bus bar is symmetrical with the first bus bar. Is disposed spaced apart, the first current transformer is connected to one side of the line switch, the cable head is connected to the other side of the line switch, the transformer It is connected to the upper end of the cable head, the first current transformer and the second current transformer is connected at the same height to the front end and the rear end of the breaker.

In one embodiment, the first current transformer and the breaker may be included in an integrated enclosure, and in another embodiment, the first current transformer, the second current transformer and the breaker may be included in an integrated enclosure. In an embodiment, the first bus bar, the second bus bar, and the line switch may include a disconnector and a ground switch, respectively, to configure a normal state, a disconnect state, and a ground state of the gas insulated switchgear. In one embodiment, the first bus bar, the second bus bar and the line switch may include a disconnector, a repair ground switch and a line ground switch.

According to the disclosed technology of the present application, in the installation of the gas insulated switchgear, a current transformer is disposed at the front and rear ends of the circuit breaker, thereby providing the effect of being free from the constraint of the installation space and easily using the installation space.

1 is a view showing a conventional gas insulated switchgear.
2 is a circuit diagram of a conventional gas insulated switchgear.
3 is a view showing a gas insulated switchgear according to an embodiment of the disclosed technology.
4 is a view illustrating a gas insulated switchgear in which a first current transformer and a circuit breaker are integrated according to another embodiment of the gas insulated switchgear in FIG. 3.
FIG. 5 is a view illustrating a gas insulated switchgear in which a first current transformer, a second current transformer, and a breaker are integrated according to another embodiment of the gas insulated switchgear shown in FIG. 3.
6 is a circuit diagram of the gas insulated switchgear shown in FIGS. 3 to 5.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments may be variously modified and may have various forms, and thus the scope of the disclosed technology should be understood to include equivalents capable of realizing the technical idea. In addition, the objects or effects presented in the disclosed technology does not mean that a specific embodiment should include all or only such effects, and thus the scope of the disclosed technology should not be understood as being limited thereto.

Meanwhile, the meaning of the terms described in the present application 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 should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, 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.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art 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 application.

3 is a view showing a gas insulated switchgear according to an embodiment of the disclosed technology. Here, FIG. 3A is a plan view of the gas insulated switchgear, and FIG. 3B is a side view.

Referring to FIG. 3, the gas insulated switchgear 300 includes a circuit breaker 310, a gas insulated bus unit 320, a first bus 330, a second bus 340, a line switch 350, and a cable head. 360, transformer 370, first current transformer 380, and second current transformer 390.

The circuit breaker 310 is a current through the usual, and when an abnormality occurs in the circuit to operate instantly to protect the line or the main equipment. It is fixed to the ground, and includes a circuit breaker driver 312 is a mechanical device for driving the circuit breaker 310 on the top.

The gas insulated busbar part 320 includes a bus bar inside an enclosure filled with insulating gas, and includes bus bars (ie, a first bus bar 330 and a second bus bar) between devices constituting the gas insulated switchgear 300. 340) is electrically connected to provide an energization path.

The first bus bar 330 is connected to the first main bus line 600a and opens and closes the gas insulated switchgear 300. In one embodiment, the first bus bar 330 may include a first disconnector 332 and a first ground breaker 334 to configure a normal state, a disconnected state, and a ground state of the gas insulated switchgear 300. It can be implemented as a two-phase or three-phase switch. In addition, in another embodiment, the first bus bar 330 may be implemented as a switch including a disconnector, a repair ground switch and a line ground switch.

The second bus bar 340 is connected to the second main bus line 600b and opens and closes the gas insulated switchgear 300. In one embodiment, the second bus bar 340 may include a second disconnector 342 and a second ground switch 344 to configure a normal state, a disconnected state, and a ground state of the gas insulated switchgear 300. It can be implemented as a two-phase or three-phase switch. In addition, in another embodiment, the second bus bar 340 may be implemented as a switch including a disconnector, a repair ground switch and a line ground switch.

The line switch 350 opens and closes the gas insulated switchgear 300. In an embodiment, the line switch 350 may include a third disconnector 352 and a third ground switch 354 to configure a normal state, a disconnected state, and a ground state of the gas insulated switchgear 300. Can be.

In one embodiment, the line switch 350 may further include a line ground switch 356, the third ground switch 354 may be used as a repair ground switch. Here, the line grounding switch 356 is provided at the line inlet to open and close the line ground.

The cable head 360 is a facility for connecting the high voltage overhead power cable and the underground power cable. The cable head 360 is connected to the power cable embedded in the ground.

Transformer 370 is connected to cable head 360 and lowers the high voltage to low voltage.

The first current transformer 380 measures the amount of current flowing between the breaker 310 and the line switch 350.

The second current transformer 390 measures the magnitude of the current flowing between the breaker 310, the first bus 330, and the second bus 340.

Here, the gas insulated busbar 320 is connected to one side of the second current transformer 390, and the first busbar 330 and the second busbar 340 are respectively disposed at the upper and lower ends of the gas insulated busbar 320. Are connected symmetrically. For example, the rear end of the gas insulated bus unit 320 is connected to the front end of the second current transformer 390, and the first bus 330 is electrically connected to the upper end of the gas insulated bus unit 320. The bus bar 340 is electrically connected to the lower end of the gas insulated bus bar part 320 but is spaced apart from the ground at a position symmetrical with the first bus bar 330.

In one embodiment, the gas insulated bus unit 320 may be divided into a T-shape to be connected to the second current transformer 390, the first bus 330 and the second bus 340.

The first current transformer 380 is connected to one side of the line switch 350, and the cable head 360 is connected to the other side. In addition, the transformer 370 is connected to the top of the cable head 360.

The first current transformer 380 and the second current transformer 390 are connected to one side and the other side of the breaker 310, respectively. The first current transformer 380 and the second current transformer 390 may be connected to the same height at the front end and the rear end of the circuit breaker 310. The height of the first current transformer 380 from the ground Height.

4 is a view illustrating a gas insulated switchgear in which a first current transformer and a circuit breaker are integrated according to another embodiment of the gas insulated switchgear in FIG. 3.

In FIG. 4, the first current transformer 380 and the breaker 310 may be included in an integrated enclosure. That is, the breaker 310 and the first current transformer 380 may be formed in a structure in which the insulation gas is shared inside one enclosure filled with the insulation gas.

FIG. 5 is a view illustrating a gas insulated switchgear in which a first current transformer, a second current transformer, and a breaker are integrated according to another embodiment of the gas insulated switchgear shown in FIG. 3.

In FIG. 5, the first current transformer 380, the second current transformer 390, and the breaker 310 may be included in an integrated enclosure. That is, the first current transformer 380, the second current transformer 390, and the circuit breaker 310 may be formed in a structure in which the insulation gas is shared inside one enclosure filled with the insulation gas.

6 is a circuit diagram of the gas insulated switchgear shown in FIGS. 3 to 5.

Comparing the circuit of FIG. 6 with the circuit of the conventional gas insulated switchgear shown in FIG. 2, in FIG. 6, the first current transformer 380 and the second current transformer 390 are connected before and after the breaker 310.

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

300: gas insulated switchgear 310: breaker
312: circuit breaker driver 320: gas insulated busbar
330: first bus 340: second bus
350: track switch 360: cable head
370 transformer 380 first current transformer
390: second current transformer 600a: primary bus
600b: week 2 main bus

Claims (5)

In the gas insulated switchgear including a circuit breaker, a 1st bus, a 2nd bus, a line switch, a transformer, a cable head, a gas insulated bus part, a 1st current transformer, and a 2nd current transformer,
The gas insulated bus unit provides an electricity supply path for electrically connecting a first bus bar connected to a first main bus bar and a second bus bar connected to a second main bus bar, and a front end of the second current transformer is connected to a rear end of the gas insulated bus bar part. And are divided into T-shape so that the first bus bar and the second bus bar are symmetrically connected to upper and lower ends of the gas insulated bus bar, respectively.
The second bus bar is spaced apart from the ground at a position symmetrical with the first bus bar,
The first current transformer is connected to one side of the line switch, the cable head is connected to the other side of the line switch,
The transformer is connected to the top of the cable head,
And the first current transformer and the second current transformer are connected to the front end and the rear end of the circuit breaker at the same height. The gas insulated switchgear according to claim 1, wherein the first current transformer and the circuit breaker are included in an integrated enclosure. The gas insulated switchgear according to claim 1, wherein the first current transformer, the second current transformer and the circuit breaker are included in an integrated enclosure. According to claim 1, wherein the first bus bar, the second bus bar and the line switch
A gas insulated switchgear comprising a disconnector and a ground switch, respectively, to configure a normal state, a disconnected state, and a ground state of the gas insulated switchgear. The gas insulated switchgear according to claim 4, wherein the first bus bar, the second bus bar and the line switch each include a disconnector, a repair ground switch, and a line ground switch.

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