JPS58222705A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a bushing retractable type gas insulated switchgear.

[Technical Background of the Invention] A gas-insulated switchgear in which a live part is housed in a metal cylindrical container filled with an insulating gas, such as SF6 gas, has an installation area that is comparable to that of a conventional switchgear. It is used in all fields around the world because of its ability to significantly reduce energy consumption and its reliability and other excellent properties.

When ultra-high voltage power transmission is carried out using such a gas-insulated switchgear, large capacity and high reliability will be required in each electric station facility. For this reason, a double bus system consisting of the first and second systems has been adopted as a bus configuration, so that if one bus breaks down, the other bus can be switched to receive and transmit power, and one bus can be inspected and repaired. When this happens, the reliability of the bus system is improved by switching loads and receiving and transmitting power without interruption. In addition, when taking out lines for line units, bank units, etc. from between double busbars, it is possible to remove the live parts of the switching equipment by using gas-insulated switchgear that uses insulating gas such as SF6 gas as the switching equipment. The aim is to improve the dielectric strength of the switchgear, thereby increasing the capacity and downsizing of switchgear equipment.

An example of a conventionally used bushing lead-in gas insulated switchgear will be explained with reference to FIGS. 1 to 4.
It is as follows.

In the conventional bushing retractable type gas insulated switchgear, the power transmission lines 3a and 3b of each phase of the first system and the second system, which pass through the transmission line tower 1 and are led in by the retracting tower 2, pass through the bushings 4a and 4b and are connected to the gas insulated switchgear. It is connected to two main busbars 6a, 6b of a first system and a second system via line units 5a, 5b of the insulated switchgear.

In this case, the main buses 6a and 5b of each system are both of the three-phase split type, and on the transmission line side of the main buses 6a and 6b, each phase forming the first system and the second system is connected. bushing 4
a, 4b are arranged in a straight line, and a three-phase split line unit 5a has switching equipment such as a circuit breaker and a disconnector according to the position of the bushings 4a, 4b of each phase,
5b are arranged for each bus system.

A three-phase split type tie unit 7 is provided between the main buses 6a and 6b of both systems to connect them, and a bank unit 8 is connected to the main buses 5a and 3b of both systems. Bank unit 8 is its cable head 9
connected to the transformer via.

[Problems in the Background Art] However, in the conventional gas-insulated switchgear having such a configuration, the bushings for each phase into which the power transmission lines 3a and 3b are drawn are air-insulated, and therefore the bushings for each phase for each system are The intervals between the bushings 4 must be sufficiently stepped, and as a result, the entire arrangement of the gas insulated switchgear has become elongated in the length direction of the main bus bar.

Furthermore, in the conventional gas insulated switchgear, the line units 5a and 5b of each system are arranged at both ends of the gas insulated switchgear,
Since the tie units 7 and Bankonits [-8 are arranged in a group for three phases each, there is an extra space 10a, 10b between the line units 5a, 5b and the center tie unit 7, etc. However, there was also the disadvantage that the main busbars 6a and 6b became longer.

[Object of the Invention] The present invention was proposed to solve the problems of the prior art as described above, and its purpose is to provide a gas-insulated switchgear that is more compact. It is in.

[Summary of the Invention] The gas insulated switchgear of the present invention secures air insulation distance between each bushing by arranging bushings for each system on both sides of the main bus bar of each system arranged in parallel. However, it is intended to reduce the size of the gas insulated switchgear by a3 in the length direction of the main bus bar.

[Embodiment of the Invention] Next, an embodiment of the present invention will be specifically described based on FIGS. 5 and 6. In this embodiment, the main bus, line unit, and bushing of each system are each of a three-phase split type.

As shown in the plan layout of FIG. 5, in this embodiment, lead-in steel towers 12a and 12b are arranged on both sides of the main busbars 5a and 6b of the first and second systems. The power transmission lines 3 drawn from the respective lead-in steel towers 12a and 12b are
Bushings 14a arranged on both sides like the retractable steel tower
, 14b, and is drawn into the line units 5a, 5b of each system. Here, the bushings 14a, 14b, which are arranged for three phases on both sides of each main bus bar 5a, 5b, are arranged alternately with the main bus bar in between, when viewed from the lead-in direction of the power transmission line. Therefore, these bushings 14
Line units 5a, 5 of each phase connected to a, 14b
In case b, the first system and the second system are alternately arranged along the length direction of the main bus bar.

Further, tie units 7 and bank units 8 of each phase are connected to the main buses 5a and 6b of each system in a three-phase split type.
are arranged between the line units 5a of the first system and the line units 5a of the second system which are arranged alternately.

The gas insulated switchgear of this example having such a configuration has J
3, the bushings 14a and 14b are connected to the main busbars ea and e.
Place it on both sides of b! As a result, the lengthwise dimension of the main busbar can be reduced to about half that of conventional devices. In addition, bushings 1 disposed on both sides of the main busbars 6a and eb
By arranging 4a and 14b alternately when viewed from the power transmission line lead-in direction, the length in the power transmission line lead-in direction can also be shortened. Furthermore, by arranging the tie unit 7 or bank unit 8 for each phase between the line units 5a and 5b of each system connected to the bushings 14a and 14b, it is possible to consolidate each unit, thereby reducing waste. Since there is no need to provide a large space, it is possible to further shorten the length of the gas insulated switchgear.

Note that the present invention is not limited to the illustrated embodiment, and if the air insulation distance between the bushings of each phase is relatively short, the line units of each system may be arranged adjacently, and the bank units or tie It is also possible to arrange the unit for three phases together on the outside. It is also possible to arrange a lead-in steel tower only on one side of the main bus, and to lead the power lines from there to the bushings of each system. Furthermore, three-phase all-in-one types are used as the main bus, bank unit, and tie unit.
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[Effects of the Invention] As shown in the above embodiments, according to the present invention, the main ffJ
This has the effect that the length of the gas insulated switchgear can be shortened in the line length direction and the power transmission line lead-in direction, and the installation area can be significantly reduced. Furthermore, there is an advantage that the main busbar can be shortened accordingly, and the connection busbars connecting each main device can also be shortened.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional gas insulated switchgear, Figure 2 is a front view of a conventional gas insulated switchgear with its line unit section, Figure 3 is a front view of the tie unit, and Figure 4 is a bank A front view of the unit, FIG. 5 is a plan view showing an embodiment of the gas insulated switchgear of the present invention, and FIG. 6 is a front view thereof. 1... Power transmission line tower, 2. 12a, 12b... Leading steel tower, 3... Power transmission line, 4a, 4b, 14a, 14b.
...Bushing, 5a, 5b...Line unit,
6a, 6b...Main bus bar, 7...Tie unit, 8
...Bank unit, 9...Cable head, 10
a. 10b...Space. . Figure 1

Claims (1)

[Scope of Claims] (1) In a gas-insulated switchgear with bushing lead-in, main busbars of two systems are similarly arranged in a direction orthogonal to the lead-in direction of the power transmission lines of the first and second systems, and both sides of these main busbars are arranged. A gas insulated switchgear characterized in that bushings for each system are arranged in the system, and these bushings and each main bus bar are connected via a line unit. (2) The main bus, line unit, and bushing of each system are of a three-phase split type, with the bushing of each phase arranged on both sides of the main bus, and the line unit of each phase connected to this bushing. The gas insulated switchgear according to claim 1, wherein the first system and the second system are arranged alternately across the main bus bar. 3) The scope of claims in which the first system line unit and the second system in-unit are such that bank units or tie units for each phase connected to the main bus are arranged between each line unit. The gas insulated switchgear according to item 2. (4) The transmission lines of the first system and the second system are connected to the bushing via a transmission line lead-in tower,
In addition, the power transmission line lead-in tower of the first system and the power transmission line lead-in tower of the second system are arranged opposite to each other on both sides with the main bus bar in the center. The gas insulated switchgear according to item 3.