JPH05304703A - Gas insulated switchgear - Google Patents

Abstract

(57) [Summary] [Purpose] Contributing to the reduction of the installation space of the entire equipment by allowing the shunt reactor circuit to be installed in a small installation space without affecting the layout of adjacent transmission line circuits. A gas-insulated switchgear capable of being provided. [Structure] A shunt reactor 11 is connected to a bushing connection bus 6 that connects a main bus 1 side and a bushing 7 via a shunt reactor switch 9. The shunt reactor switch 9 is arranged so that the first outlet 9a faces upward at the lower part of the bushing connecting busbar 6, and the second outlet 9b faces the direction orthogonal to or parallel to the bushing connecting busbar 6. It is arranged coaxially or orthogonally to the connecting busbar 6, is connected to the bushing connecting busbar 6 by the first outlet 9a, and is connected to the shunt reactor 11 by the second outlet 9b.

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 suitable for a backbone system in an ultra high voltage (UHV) power transmission system.

[0002]

2. Description of the Related Art UHV power transmission solves various technical problems such as long-distance and large-capacity power transmission, high-power transmission such as backbone outer ring system, and increase in system stability and system short-circuit current. As an effective power transmission method that can reduce the number and the transmission loss, it has been developed and put into practical use in Japan and other countries.

In the UHV system, it is extremely important to suppress the overvoltage generated in the system in order to reduce the size of the equipment. At a high voltage such as UHV, the charging current due to the capacitance between the electric wires and between the electric wires and the ground increases, and a phenomenon that is relatively unaffected in a system of 550 kV or less becomes apparent.

In the UHV system, the make-and-break surges are effectively suppressed by adopting a high-performance lightning arrester and a breaker resistance make-and-break system, but especially when charging a no-load transmission line. In addition, it is conceivable to install a reactor to reduce the reflection coefficient at the open end with respect to surges that occur when the voltage on the power source side enters the transmission line through the circuit breaker. That is, in order to excessively 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 offsets with the capacitance (C) of the transmission line.・ Compensation is effective.

However, the inductance (L) of the reactor and the capacitance (C) of the power transmission line form a resonance circuit depending on the operation aspect of the power transmission line and the compensation rate, and a persistent overvoltage is generated, which causes the transmission of the UHV substation. This may lead to thermal destruction of the arrester installed at the wire entry port.
Therefore, it is important to properly grasp this resonance phenomenon and appropriately select the compensation method and the compensation degree with the shunt reactor.

On the other hand, at the time of a power line accident, a system (high-speed reclosing system) is employed in which only the accident phase is interrupted, the arc current at the time of the accident disappears, and the accident phase is automatically turned on again. Especially for 2-line transmission lines, 2 lines total 6
If two different phases are healthy, perform reclosing,
The so-called "high-speed multiphase reclosing system" is adopted. However, in the UHV transmission line, since the transmission voltage is high, the current continues to flow through the arc at the accident point due to the induced voltage from the sound phase even after the breaker in the accident phase is opened after the accident or after the occurrence of the accident. This may cause a serious situation in which the arc is not extinguished, reclosing fails, and the entire transmission line route is stopped.

Therefore, in the UHV system, a high-speed grounding switch is provided between the circuit breaker and the bushing on the line side of the system, the fault phase is grounded immediately after switching, and the arc-to-arc voltage is reduced to almost zero. The so-called "high-speed automatic grounding method" is adopted, which cuts off the supply of energy to extinguish the arc.

As described above, a shunt reactor and a line side high-speed grounding switch are indispensable in a UHV system transmission and transformation substation, and the gas-insulated switchgear used in this type of transmission and transformation substation also has these requirements. Arrangement and connection configuration of equipment are important.

FIG. 6 is a single line connection diagram showing the above UHV system line circuit, and FIG. 7 is a conventional example of a gas-insulated switchgear in which the single line connection diagram of FIG. 6 is constituted by specific equipment. It is a top view shown. First, as shown in FIG. 7, the main busbar 1 is pulled out in the orthogonal direction via the busbar side disconnector 2 and connected to the circuit breaker 3. A line side disconnector 4 and a lightning arrester 5 are sequentially connected to the other end of the circuit breaker 3, and are connected to a bushing 7 via a bushing connection bus bar 6 and another lightning arrester 5.

Further, a shunt reactor line is arranged on the side of the bushing connecting bus bar 6 which constitutes the transmission line line as described above. That is, the bushing connection bus bar 6 is provided with a branch, the auxiliary bus bar 8 is drawn out in a direction orthogonal to the bushing connection bus bar 6, and the shunt reactor switch 9 is coaxially connected to the other end of the auxiliary bus bar 8. Has been done. The shunt reactor 11 and the lightning arrester 5 are connected to the other end of the shunt reactor switch 9 via the shunt reactor connection bus bar 10. In this case, the shunt reactors 11 of each phase are arranged in a line in the direction orthogonal to the bushing connection bus bar 6.

[0011]

The conventional gas-insulated switchgear having the above-mentioned structure has the following problems. That is, the shunt reactor switch 9 must switch the current of the UHV shunt reactor 11, and a general disconnector cannot withstand its duty. Therefore, it is necessary to apply a switch equivalent to a circuit breaker. There is
A fairly large piece of equipment will be used. for that reason,
A large installation space extending in a direction orthogonal to the bushing connection bus bar 6 is required for the shunt reactor circuit on the side of the bushing connection bus bar 6 between the power transmission line circuits.

However, since the installation space of the entire gas-insulated switchgear is generally limited, the space between the transmission line circuits is limited. Therefore,
When the installation space of the shunt reactor circuit installed between the transmission line and the transmission line becomes large as described above,
The shunt reactor circuit will interfere with the adjacent transmission line circuit. In order to solve this problem, as shown in FIG. 7, the bending portion 12 is provided in the bushing connection bus bar 6 of the adjacent transmission line circuits, which affects the arrangement of the adjacent transmission line circuits. In other words, in the gas-insulated switchgear shown in FIG. 7, since the shunt reactor circuit is provided, the space between the bushing connection busbars 6 of the adjacent transmission line circuits is forcibly widened, while the adjacent transmission lines are arranged. A wasteful space is left between the line-side disconnectors 4 of the electric wire line and between the circuit breakers 3.

The present invention has been proposed in order to solve the problems of the prior art as described above, and an object thereof is to provide a shunt reactor line without affecting the arrangement of adjacent transmission line lines. The present invention is to provide a gas-insulated switchgear that can contribute to a reduction in the installation space of the entire device by enabling the installation in a small installation space.

[0014]

A gas-insulated switchgear according to the present invention is a gas-insulated switch in which a shunt reactor is connected to a bushing connection bus connecting a main bus side and a bushing through a shunt reactor switch. In the switchgear, the shunt reactor switch has a first outlet that is pulled out from one end in the axial direction and a second outlet that is pulled out in the direction orthogonal to the first outlet from the other end in the axial direction. And, the switch for the shunt reactor, the first mouthpiece is directed upward, the second mouthpiece is oriented in a direction orthogonal to or parallel to the bushing connection busbar, below the bushing connection busbar. It is arranged coaxially or orthogonally to this bushing connection busbar, is connected to the bushing connection busbar by a first outlet, and is connected to the shunt reactor by a second outlet. It is characterized in that.

[0015]

In the gas-insulated switchgear of the present invention having the above-described structure, the shunt reactor switch is arranged below the bushing connecting busbar, so that both are three-dimensionally arranged on the same installation surface. Therefore, the installation space for the shunt reactor line can be reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Three embodiments of the gas insulated switchgear according to the present invention will be described below with reference to FIGS. In this case, FIG. 1 is a plan view showing the first embodiment of a gas insulated switchgear in which the single wire connection diagram of FIG. 6 is constituted by concrete equipment according to the present invention, and FIG. 2 is a gas insulated switchgear of FIG. It is a figure which shows arrangement | positioning / connection structure of the switch for shunt reactors in an apparatus, (A) is a side view, (B) is a A arrow view of (A). In addition, FIG. 3 is a single line connection diagram of FIG.
FIG. 4 is a plan view showing a second embodiment of a gas insulated switchgear constituted by concrete devices according to the present invention, and FIG. 4 shows an arrangement / connection configuration of shunt reactor switches in the gas insulated switchgear of FIG. It is a side view. Further, FIG.
FIG. 11 is a plan view showing a third embodiment of a gas insulated switchgear constructed by concrete equipment according to the present invention, in the single wire connection diagram of FIG. The same parts as those of the conventional technique shown in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted.

First, the first embodiment shown in FIGS. 1 and 2 will be described. That is, as shown in FIG. 1 and FIG.
The shunt reactor switch 9 is arranged below the bushing connecting bus bar 6 and coaxially with the bushing connecting bus bar 6. As shown in FIG. 2, the shunt reactor switch 9 includes a first outlet 9a drawn from one axial end thereof in a direction orthogonal to the axial direction, and an other axial end thereof orthogonal to the axial direction. Direction, and a second lead-out 9b that is pulled out in a direction orthogonal to the first lead-out 9a is provided, the first lead-out 9a faces upward, and the second lead-out 9b faces the direction orthogonal to the bushing connection bus bar 6. Are arranged as follows. Then, the switch 9 for the shunt reactor is the first outlet 9a.
Is connected to the bushing connection bus bar 6 by the second outlet 9b, and is connected to the shunt reactor connection bus bar 10 by the second lead 9b.
The shunt reactor 11 and the lightning arrester 5 are connected via the.

Further, as shown in FIG. 1, the switch 9 for the shunt reactor of each phase is sequentially displaced in the axial direction of the bushing connecting bus 6 so as not to interfere with the shunt reactor connecting bus 10 of the other phase. Are arranged. Further, the shunt reactor connection bus bars 10 of the respective phases are sequentially arranged so as to be sufficiently spaced from each other. The shunt reactors 11 are arranged in a line in the axial direction of the bushing connecting bus bar 6.

In the gas-insulated switchgear of the present embodiment having the above-mentioned structure, the shunt reactor switch 9 is provided.
Are arranged below the bushing connection bus bar 6, so that they can be three-dimensionally arranged on the same plane. In particular, in this embodiment, since the shunt reactor switch 9 is arranged coaxially with the bushing connection bus bar 6, the installation space of the shunt reactor switch 9 can be significantly reduced. Moreover,
Since the auxiliary busbar 8 that connects the bushing connection busbar 6 and the shunt reactor switch 9 can be shortened to the minimum, the installation space for the shunt reactor circuit can be significantly reduced compared to the conventional case. That is, the dimension in the direction orthogonal to the bushing connection bus bar 6 in the installation space required for the shunt reactor line can be significantly reduced. Therefore, unlike the conventional case, there is no possibility of interfering with the adjacent transmission line circuit and the arrangement thereof is not affected.

Further, as described above, in this embodiment, the installation space of the switch 9 for the shunt reactor can be greatly reduced, so that as shown in FIG.
1 can be arranged in a line in the axial direction of the bushing connecting bus bar 6. That is, the line-side disconnector 4 which was a wasted space in the conventional technique shown in FIG.
Since the shunt reactor 11 can be arranged in the space between the circuit breakers and the circuit breaker 3, the bushing connecting busbar 6 is shortened by that amount, and as a result, the bushing 7 and the main busbar 1 are
The dimension between and can be shortened.

As described above, in the present embodiment, in the installation space required for the shunt reactor line,
Since the dimension in the direction orthogonal to the bushing connection bus bar 6 can be significantly shortened, and the bushing connection bus bar 6 can be shortened to reduce the dimension between the bushing 7 and the main bus bar 1, the installation space for the entire gas insulated switchgear can be reduced. The size can be greatly reduced compared to the past.

Next, a second embodiment shown in FIGS. 3 and 4 will be described. That is, as shown in FIGS. 3 and 4,
The shunt reactor switch 9 is arranged below the bushing connecting bus bar 6 in a direction orthogonal to the bushing connecting bus bar 6. As shown in FIG. 4, this shunt reactor switch 9 has a first outlet 9a drawn from one axial end thereof in a direction orthogonal to the axial direction, and an axial exit (a) extending from the other axial end thereof. Therefore, it is provided with a second lead-out 9b that is drawn out (in a direction orthogonal to the first lead-out 9a), the first lead-out 9a faces upward, and the second lead-out 9b faces in a direction orthogonal to the bushing connection bus bar 6. Are arranged as follows. Then, the shunt reactor switch 9 is connected to the bushing connection bus bar 6 by the first outlet 9a, and
Is connected to the shunt reactor 11 and the lightning arrester 5 via the shunt reactor connection bus bar 10.

Further, as shown in FIG. 3, the shunt reactor switch 9 of each phase is sequentially displaced in the axial direction of the bushing connection bus 6 so as not to interfere with the shunt reactor connection bus 10 of another phase. Are arranged. Further, the shunt reactor connection bus bars 10 of the respective phases are arranged so as to be appropriately displaced so as to have a sufficient space between the phases. The shunt reactors 11 are arranged in a line in the axial direction of the bushing connecting bus bar 6.

In the gas-insulated switchgear of the present embodiment having the above-mentioned structure, the switch 9 for the shunt reactor is arranged below the bushing connecting bus bar 6 in the same manner as in the above-mentioned embodiment so that both of them can be connected. It can be placed three-dimensionally on the same plane.
In particular, in this embodiment, since the shunt reactor switch 9 is arranged in the direction orthogonal to the bushing connection bus bar 6, the auxiliary bus bar 8 and the shunt reactor connection bus bar 10 can be shortened to the minimum. The installation space for the shunt reactor line can be significantly reduced. That is, similarly to the above-described embodiment, the dimension in the direction orthogonal to the bushing connection bus bar 6 in the installation space required for the shunt reactor line can be significantly reduced. Therefore, as in the past,
There is no risk of interference with adjacent transmission line circuits, and their placement will not be affected.

Further, as described above, in this embodiment, the installation space of the switch 9 for the shunt reactor can be greatly reduced, so that as shown in FIG.
1 can be arranged in a line in the axial direction of the bushing connecting bus bar 6. That is, the line-side disconnector 4 which was a wasted space in the conventional technique shown in FIG.
Since the shunt reactor 11 can be arranged in the space between them, the bushing connecting busbar 6 can be shortened by that amount, and as a result, the dimension between the bushing 7 and the main busbar 1 can be shortened.

Therefore, also in this embodiment, as in the case of the above-described embodiment, in the installation space required for the shunt reactor line, the dimension in the direction orthogonal to the bushing connecting bus bar 6 can be markedly shortened and the bushing connecting bus bar can be shortened. 6
Since the distance between the bushing 7 and the main bus 1 can be shortened, the installation space of the entire gas-insulated switchgear can be significantly reduced as compared with the conventional case.

In the third embodiment shown in FIG. 5, the second outlet 9b of the one-phase shunt reactor switch 9 arranged on the bushing 7 side in the configuration of the second embodiment is
This is a modified example in which the bushing connection bus bar 6 is drawn out in parallel. In the case of such a configuration, the shunt reactor switch 9 of this phase can be brought closer to the bushing connection bus bar 6 than in the second embodiment, and as much as that, between the adjacent transmission line circuits. The space can be expanded. The space thus expanded can be effectively used as a carrying-in space for heavy equipment.

[0028]

As described above, in the present invention, the switch for the shunt reactor is arranged below the bushing connecting bus bar, so that both are three-dimensionally arranged on the same installation surface, and the shunt is formed. Since the reactor line can be placed in a small installation space without affecting the placement of adjacent transmission line lines, it is possible to provide a gas-insulated switchgear that can contribute to a reduction in the installation space of the entire device. ..

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a gas-insulated switchgear in which the single wire connection diagram of FIG. 6 is configured by concrete equipment according to the present invention.

2A and 2B are diagrams showing the arrangement and connection configuration of a switch for a shunt reactor in the gas insulated switchgear of FIG. 1, where FIG. 2A is a side view and FIG.

FIG. 3 is a plan view showing a second embodiment of the gas insulated switchgear in which the single wire connection diagram of FIG. 6 is configured by concrete equipment according to the present invention.

FIG. 4 is a side view showing an arrangement / connection configuration of shunt reactor switches in the gas insulated switchgear of FIG. 3;

FIG. 5 is a plan view showing a third embodiment of a gas insulated switchgear in which the single wire connection diagram of FIG. 6 is configured by concrete equipment according to the present invention.

FIG. 6 is a single line connection diagram showing a UHV system line circuit.

FIG. 7 is a plan view showing a conventional example of a gas insulated switchgear in which the single wire connection diagram of FIG. 6 is configured by a specific device.

[Explanation of symbols]

 1 ... Main bus 2 ... Bus side disconnector 3 ... Circuit breaker 4 ... Track side disconnector 5 ... Lightning arrester 6 ... Bushing connection busbar 7 ... Bushing 8 ... Auxiliary busbar 9 ... Shunt reactor switch 10 ... Shunt reactor connection busbar 11 ... Shunt reactor 12 ... Bending part

Claims (1)

[Claims] 1. A gas-insulated switchgear in which a shunt reactor is connected to a bushing connection bus connecting a main bus side and a bushing via a shunt reactor switch, wherein the shunt reactor switch is: The switch for a shunt reactor is provided with a first outlet drawn out from one end in the axial direction and a second outlet drawn out in the direction orthogonal to the first outlet from the other end in the axial direction. A first lead-out is directed upward and a second lead-out is oriented in a direction orthogonal or parallel to the bushing connection bus bar, below the bushing connection bus bar, and is arranged coaxially or orthogonally to the bushing connection bus bar. A gas insulated switchgear connected to the bushing connection busbar by a first outlet and connected to the shunt reactor by a second outlet.