JPH05130716A - Gas-insulated switching equipment - Google Patents

Abstract

PURPOSE:To shorten a duct line bus for connecting shunt reactor and bushing of a gas-insulated switching equipment and also reduce the installation space. CONSTITUTION:A duct line bus for connecting a bushing in each phase is installed in parallel with other buses at the same separation interval with other bushing 12. A shunt reactor 11 is installed between the duct line buses 20 for respective phases. The shunt reactor 11 of each phase is arranged in parallel with the main bus 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear for a trunk system such as UHV, and more particularly to a gas insulated switchgear having an improved arrangement of gas insulated electrical equipment.

[0002]

2. Description of the Related Art UHV power transmission solves various technical problems such as long-distance large-capacity power transmission, backbone outer ring system, etc., such as increase in system stability and system short-circuit current associated with high-power transmission, and the number of transmission line routes. As an effective power transmission method that can reduce power consumption and reduce transmission loss, it has been developed and put to practical use in Japan and around the world. In such a UHV system, it is extremely important to control the overvoltage generated in the system in order to make the equipment compact. At a high voltage such as UHV, the charging current due to the capacitance between the wires and between the wires and the ground increases, and a phenomenon that is relatively unaffected in the system of 500 kV or less becomes apparent. is there.

Further, in the UHV system, a high-performance lightning arrester and a circuit breaker resistance closing / resisting breaking system are used to effectively suppress closing / breaking surges.
When charging a no-load transmission line, it is conceivable to install a reactor to reduce the reflection coefficient at the open end against the input surge that occurs when the power supply side voltage enters the transmission line through the circuit breaker. ..

That is, in order to appropriately suppress the enormous charging current of the UHV transmission line and maintain the system voltage appropriately, a reactor (shunt reactor) is directly connected to the transmission line and the capacitance (C It is effective to offset and compensate. However, the inductance (L) of the reactor and the capacitance (C) of the transmission line form a resonance circuit depending on the operation aspect of the transmission line and the compensation rate, and a persistent overvoltage occurs, which causes the transmission line inlet of the UHV substation. Since there is a risk of thermal damage to the lightning arrester installed in, it is important to properly grasp this resonance phenomenon and to select the compensation method and degree of compensation with the shunt reactor appropriately.

On the other hand, in the case of a power line accident, a system that shuts off only the accident phase, waits for the arc current at the accident point to disappear, and then automatically turns on the accident phase again (high-speed reclosing system).
Has been adopted. In particular, in the two-line power transmission line, the "high-speed multi-phase reclosing system" is adopted, in which two different phases out of a total of six phases are normally closed. However,
Since the UHV transmission line has a high transmission voltage, the arc is extinguished by continuing to flow current through the arc at the accident point by induction from the sound phase even after the accident or after the accident and after the circuit breaker in the accident phase has been opened. Without reclosing,
There can be a serious situation in which the entire power line route is shut down. For this reason, the UHV system employs a "high-speed automatic grounding method" in which the accident phase is grounded immediately after opening, the inter-arc voltage is made almost zero, and the energy supply to the arc is cut off to extinguish the arc.

4 and 5 show the arrangement of a conventional gas insulated switchgear (hereinafter abbreviated as GIS). That is, in the gas-insulated switchgear shown in FIG. 4, the main buses 1 are of single-phase type and are arranged in parallel with each other.
The busbar side disconnector 3 which is each line drawing portion is staggered in each phase, and the upper and lower shells are connected via the connecting busbar 2. Further, the current transformer 4 for an instrument and the circuit breaker 5 are coaxially connected to the connecting bus bar 2 in a direction perpendicular to the main bus bar axis.

Further, the circuit breaker 5 is connected with a current transformer 4 for an instrument, a line-side disconnector 6 and a line-side high-speed grounding switch 7,
It is connected to the bushing 12 via a bushing connecting pipe bus 8. The connecting line busbars 8 are arranged on both sides of the line busbar 8b connected to the central bushing 12b, and the other-phase pipe line busbars 8a and 8c are arranged in parallel in close proximity to each other. A shunt reactor 11 is connected to each of the bus lines 8a to 8c through a lightning arrester 10 and a shunt reactor switch 9. The shunt reactor 11 of each phase is arranged in parallel with the main bus 1.

Further, in the gas-insulated switchgear shown in FIG. 5, of the shunt reactors 11 connected to the respective bus lines 8a to 8c, the one-phase shunt reactor 11a is the other shunt reactor 11b. , 11c are arranged at different positions. Other configurations are similar to those of the gas-insulated switchgear shown in FIG.

As described above, in the conventional gas-insulated switchgear, the shunt reactor 11 is arranged in an empty space outside the bus line 8 for connecting the bushing of the line circuit.

[0010]

However, the conventional gas-insulated switchgear as described above has the following problems to be solved. That is, in the gas insulated switchgear shown in FIG.
Has a relatively short length, but since the shunt reactor 11 for each phase is arranged in parallel with the main bus line 1, the shunt reactor connection pipe bus line 13 becomes long, and the heavy equipment enters the GIS yard. The space was getting smaller.

Further, in the gas-insulated switchgear shown in FIG. 5, since the shunt reactors of the respective phases are arranged adjacent to the side of the bushing connecting pipe busbar 8, the shunt reactors are connected. Although the pipeline busbar can be short, the two-phase shunt reactors 11a and 11b are arranged in parallel with the bushing connection pipeline bus 8, so that the bushing connection pipeline bus 8 is very long.

The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and the purpose thereof is to shorten the pipe bus bar for connection with the bushing and the shunt reactor as much as possible to reduce the installation space. It is to provide a gas-insulated switchgear that can be realized.

[0013]

DISCLOSURE OF THE INVENTION The present invention is a line circuit of a gas insulated substation, and in a gas insulated switchgear in which a device such as a circuit breaker is a single-phase device, a line is drawn out in a direction perpendicular to a main bus axis. And a line busbar of each phase connecting the line drawing part and the bushing of the line circuit is arranged in parallel with each other according to the separation distance between the phases of the bushing, and
The shunt reactor of each phase is installed in the space between the bus lines.

[0014]

According to the gas insulated switchgear of the present invention, the bushing connecting pipe busbars are arranged in parallel with each other in accordance with the spacing distance between the bushings, and the shunt reactors of each phase are provided in the space between the pipe busbars. By arranging them, the arrangement of the devices of the gas insulated switchgear can be made compact, and the length of the pipe busbar can be greatly shortened compared to the conventional one.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. The same members as those of the conventional type shown in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, as shown in FIG.
The bushing connecting pipe bus bars 20 of the respective phases are arranged in parallel with each other in accordance with the distance between the corresponding bushings 12. Then, the shunt reactor 1 is provided between each pipeline bus 20.
1 is arranged. In addition, the shunt reactor 11 of each phase
Are arranged parallel to the main bus 1. Further, other configurations are similar to those of the conventional type shown in FIGS. 4 and 5.

In the gas-insulated switchgear arranged as described above, the line bus bushing connecting bus bar 20 is connected.
Are arranged in parallel according to the separation distance between the phases of the bushings, and the shunt reactor 11 is installed in the empty space between the phases, so that not only the bushing connection pipeline bus 20 but also the shunt reactor connection pipeline The bus bar can also be shortened. Moreover, since the empty space between the pipeline bus lines of each phase can be effectively used, the space of the gas insulated substation can be reduced.

[0018]

As described above, according to the gas-insulated switchgear of the present invention, the line lead-out portion is provided in the direction perpendicular to the main bus axis, and each phase connecting the line lead-out portion and the line line bushing is connected. The pipe busbars of are arranged in parallel with each other according to the separation distance between the phases of the bushings, and the shunt reactors of each phase are installed in the space between the busbars to connect the bushing and the shunt reactor. It is possible to provide a gas-insulated switchgear that shortens the road busbar as much as possible and reduces the installation space.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a gas-insulated switchgear of the present invention.

FIG. 2 is a side view of FIG.

[Fig. 3] Single line connection diagram of UHV system line circuit

FIG. 4 is a plan view showing an example of a conventional gas-insulated switchgear.

FIG. 5 is a plan view showing another example of a conventional gas-insulated switchgear.

[Explanation of symbols]

 1 ... Main bus 2 ... Connecting bus 3 ... Bus side disconnecting switch 4 ... Measuring current transformer 5 ... Circuit breaker 6 ... Track side disconnecting switch 7 ... Track side high-speed grounding switch 8 ... Bushing connecting conduit bus 9 ... Min Switch for road reactor 10 ... Lightning arrester 11 ... Shunt reactor 12 ... Bushing 13 ... Pipeline bus for connecting shunt reactor 20 ... Pipeline bus for connecting bushing

Claims (1)

[Claims] 1. In a gas-insulated switchgear in which a circuit such as a circuit breaker is a single-phase device in a line circuit of a gas-insulated substation, a line lead-out portion is provided in a direction perpendicular to a main bus axis, and the line lead-out portion is provided. The line busbars of each phase that connect the line and the bushing of the line are arranged in parallel with each other according to the separation distance between the bushings, and the shunt reactor of each phase is installed in the space between the line busbars. Gas insulated switchgear characterized by the above.