JPH0740764B2 - Gas insulated switchgear - Google Patents

Description

The present invention relates to a gas-insulated switchgear, and more particularly to an improved connection and layout of a reactor line for adjusting power drawn by a power cable.

(Prior Art) In the substation or switching station which is installed in large cities around Toka waterfront area, for reasons of obtaining difficulty Toka salt damage in land, the electric devices constituting the substation Toka switchyard SF ₆ gas A gas-insulated switchgear sealed with an insulating gas such as

In this type of gas-insulated switchgear, a circuit breaker, a disconnecting switch, and other required equipment are arranged three-dimensionally, the distance between the equipment is narrowed, and the site area is greatly reduced. Also, especially in the central areas of the city, the use of overhead lines has become less common, and networks using electric power cables have been introduced in most of them. In such a network, a reactor is installed to improve the power efficiency in order to reduce the reactive power. Furthermore, the connection to such a reactor has also come to be constituted by a gas-insulated switchgear.

The general structure of such a gas-insulated switchgear is shown in FIGS. 10 (a) and 10 (b) as a single-line diagram and FIG. 11 (a).
Each will be described with reference to sectional views of (b). Note that FIG. 10 (a) shows a single line connection diagram in which the reactor line is taken from the main bus, and FIG. 10 (b) is a single line connection diagram in which the reactor line is taken from the lead-in point. Here, description will be given based on the single line diagram of the system shown in FIG. 10 (b) in which the reactor line is taken from the lead-in point. That is, as shown in FIG. 11 (a), the conventional power receiving line is connected to the circuit breaker 5 from the main bus 1 through the disconnector 2, the earthing switch 3, and the current transformer 4 for the instrument, and further for the instrument transformer. It reaches the power receiving cable head 7 through the current transformer 4, the disconnector 2, the grounding switch 3 and the instrument transformer 6. Further, in order to connect to the gas insulated switchgear of the reactor line, a cable line 8 for connection of the reactor line is arranged in parallel with the cable head 7 for power reception. Further, as shown in FIG. 11 (b), the conventional reactor line is pulled into the cable head 9 by the power cable from the connecting cable head 8 of the reactor line arranged in the power receiving line, and the disconnector 2 and the grounding switch are connected. Connected to the circuit breaker 5 via the device 3 and the instrument current transformer 4, and further connected from the circuit breaker 5 to the instrument current transformer 4 and the grounding switch 3 to the reactor by the power cable from the reactor connection cable head 10. Has been done.

(Problems to be solved by the invention) By the way, conventionally, as described above, the gas-insulated switchgear of the reactor line is arranged in a place distant from the gas-insulated switchgear of the substation, and the two are connected by a power cable. There were many cases. However, in the conventional arrangement example as described above, in addition to the installation location of the gas-insulated switchgear in the substation, another site must be secured in order to install the gas-insulated switchgear for the reactor. It was very difficult to secure. Also, since the gas insulated switchgear at the substation and the gas insulated switchgear for the reactor are connected by a power cable, a power cable for connecting the reactor line and a cable for connecting the power cable and the gas insulated switchgear. A head was required, and it was not desirable because it was costly and time-consuming for cabling for cable construction and cable connection work.

The present invention has been made in view of the above points, and an object thereof is to improve the arrangement configuration of a gas insulated switchgear which is drawn in by a power cable and has a reactor line, which reduces the site area and the number of parts. An object of the present invention is to provide a gas-insulated switchgear capable of reducing the cost and having excellent workability.

[Structure of Invention]

(Means and Actions for Solving Problems) In order to achieve this object, according to the present invention, a branch connection point is provided between the cable head of the power receiving line and the breaker of the power receiving line, By arranging the device adjacent to the power receiving line and connecting the branch connection point and the reactor line with a connecting bus bar, and effectively arranging the device, unnecessary parts such as cable heads and power cables are unnecessary. The installation area can be reduced, and the work can be easily performed when the cable head is constructed.

(Embodiment) An embodiment of the gas-insulated switchgear of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in single-line diagram of FIG. 1, the power receiving line A is the main bus 1 _-1 disconnector 2 from being connected to the breaker 5a through earthing switch 3a, a current transformer 4a meter, varying further meter It is connected to a power receiving cable head 7 via a current transformer 4a, a disconnecting switch 2, a grounding switch 3a and an instrument transformer 6.

Further, the equipment of the reactor line B is directly connected from the branch connection point 13 between the disconnector 2 of the power receiving line A and the circuit breaker 5a. That is, the current transformer 4b of the reactor line B is connected to the branch connection point 13 between the current transformer 4a of the power receiving circuit breaker 5a and the disconnector 2 on the power receiving side, and the circuit breaker 5b,
It is connected to the reactor 11 through the instrument current transformer 4b and the grounding switch 3b by the reactor-connecting cable head 10.

The layout of the equipment based on this single line connection diagram is shown in FIGS. In this embodiment, the circuit breaker is a U-shaped circuit breaker. In addition, a connecting busbar 12 parallel to the main busbar is arranged in the upper part of the power receiving line A at the connecting portion between the power receiving line A and the reactor line B, and a measuring instrument is provided at the upper outlet of the reactor circuit breaker 5b adjacent to the power receiving line A. It is connected through the current transformer 4b. In the gas-insulated switchgear of this embodiment having such a configuration, since the gas-insulated switchgear for power reception and the gas-insulated switchgear for reactors are arranged adjacent to each other, no extra space is required, and Since they are in the same place, maintenance and inspection work of equipment can be performed efficiently.

Further, since the gas-insulated switchgear for power reception and the gas-insulated switchgear for reactors are directly connected, the connection-use cable head and power cable, which were conventionally required, are no longer required, and the circuit breaker 5a and the disconnector 2 of the power receiving line A are not required. By branching the reactor line B from the branch connection point 13 between the two, it is possible to reduce the number of disconnectors and grounding switches for the reactor line, and it is possible to significantly reduce the cost. Further, since the reactor-connecting cable head is disposed adjacent to the power-receiving cable head, there is also an advantage that the cable cavern can be shared and the cable construction can be performed very easily.

Next, a first other embodiment of the present invention will be described with reference to FIGS. The same parts as those in FIGS. 1 to 4 are designated by the same reference numerals. As shown in single-line diagram of FIG. 5, the power receiving line A is the main bus 1 _-1, 1 _-2 than disconnector 2,2,
It is connected to the circuit breaker 5a through the earthing switch 3a, and further, the earthing switch 3a, the disconnector 2, the current transformer 4a for the instrument, and the earthing switch.
3a, from the instrument transformer 6 to the power receiving cable head 7
It is connected to the. Also, the disconnector 2 on the power receiving side of the power receiving line A
And the reactor current B are branched from the branch connection point 13 between the current transformer 4a and the current transformer 4a. This reactor line B is connected to a reactor 11 by a cable head 10 for connecting the reactor from the earthing switch 3b through a disconnector 2b, a grounding switch 3b, a current transformer 4b for an instrument, a circuit breaker 5b and a current transformer 4b for an instrument. It is connected. The arrangement of the equipment based on this single line diagram is shown in FIG. FIG. 6 shows the case where a U-shaped circuit breaker is used. And power receiving line A and reactor line B
A connection busbar 12 parallel to the main busbar is arranged at a branch connection point 13 between and above the power receiving line A, and a disconnector 2b and a ground switch are provided at the upper outlet of the reactor circuit breaker 5b adjacent to the power receiving line A.
3b and a current transformer for instrument 4b. In the gas-insulated switchgear having such a configuration, since the gas-insulated switchgear for power reception and the gas-insulated switchgear for reactors are arranged adjacent to each other, no extra space is required and they are in the same place. Therefore, maintenance and inspection work of equipment can be efficiently performed. In addition, since the gas-insulated switchgear for power reception and the gas-insulated switchgear for reactors are directly connected, the connection-use cable head and power cable that were required in the past are no longer required, and the disconnector on the power-receiving side of the power receiving line and the current transformer By branching the reactor line from the reactor, it is possible to reduce the number of bus line disconnectors for the reactor line and current transformers for measuring instruments on the bus line for the power receiving line. Is possible.

Further, since the reactor-connecting cable head is disposed adjacent to the power-receiving cable head, the cable cavern can be shared, and cable head construction can be performed very easily. Moreover, by arranging the power receiving side disconnector of the power receiving line between the breaker of the power receiving line and the branch connection point of the reactor line,
Even if the circuit breaker and bus side equipment of the power receiving line are stopped due to inspection work, etc., with the disconnector on the power receiving side of this power receiving line in the "open" state, the opposite transformer connected to the power receiving cable head side It is possible to connect the reactor line to each load such as a place, and the range of utilization of the reactor can be greatly expanded. Also, by arranging the current transformer for the power receiving side of the power receiving line between the branch connection point of the reactor line and the power receiving side cable head, the reactor can monitor the current of the power receiving line even when using the reactor, It becomes possible to protect against ground faults. If the current transformer for the instrument on the power receiving side is installed on the power receiving side ahead of the branch connection point, the current can be monitored in any case, but the grounding switch on the power receiving side or the instrument transformer It is desirable to treat a ground fault accident, etc. at the same time as a ground fault accident and to monitor and protect with this current transformer for the instrument on the power receiving side. It is optimal and more effective to arrange the mounting position at the position closest to the branch connection point of the reactor line.

The embodiment of the present invention and the first other embodiment are not limited to the embodiments shown in FIGS. 2 to 8, and as shown in FIGS. 9 (a) and 9 (b), a circuit breaker is provided. As a matter of course, a Z-type circuit breaker may be used, and the connecting bus bar may not be slightly parallel to the main bus bar.

〔The invention's effect〕

As described above, according to the present invention, the equipment of the reactor line is arranged adjacent to the power receiving line, so that the branch connecting point of the power receiving line and the connecting bus line connecting the reactor line are arranged not slightly parallel to the main bus line. Even if the site area can be reduced and the number of parts such as cable heads, power cables, disconnectors and current transformers for instruments can be reduced, an economical and workable gas insulated switchgear can be provided, and a reactor line can be provided. There is an advantage that the range of utilization of can be greatly expanded and the range of monitoring by the current transformer for instruments can be improved.

[Brief description of drawings]

FIG. 1 is a single wire connection diagram of the gas insulated switchgear of the present invention, and FIG.
Fig. 1 is a plan view showing the arrangement of devices based on the single line connection diagram of Fig. 1, Fig. 3 is a sectional view taken along the line III-III of Fig. 2, and Fig. 4 is a sectional view taken along the line IV-IV of Fig. 2. FIG. 5 is a single line connection diagram of the first other embodiment of the present invention, FIG. 6 is a plan view of arrangement of equipment based on the single line connection diagram of FIG. 5, and FIG. 7 is VII-VII of FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6, and FIGS. 9A and 9B are FIG. 6 and FIG. 6 of the second embodiment of the present invention, respectively. Sectional view corresponding to FIG. 7, FIG. 10 (a),
(B) is a single wire connection diagram of the conventional gas insulated switchgear, respectively.
11 (a) and 11 (b) are sectional views of the conventional gas-insulated switchgear of FIG. 10 (b), respectively. 1 _-1 , 1 _-2 ...... Main bus, 2 ...... Disconnector, 3a, 3b ...... Grounding switch, 4a, 4b ...... Current transformer for instrument, 5a ...... Receiver circuit breaker, 5b ...... Circuit breaker for reactor line, 6 ... Transformer for instrument, 7 ... Cable head for receiving power, 10 ... Cable head for connecting reactor, 11 ... Reactor, 12 ... Connection busbar, 13 ... Branch connection point, A …… Power receiving line, B …… Reactor line.

Claims (4)

[Claims] 1. A gas insulated switchgear having a power receiving line which is drawn in by a power cable and connected to a main bus and a reactor line, wherein a branch connection point is provided between a cable head of the power receiving line and a circuit breaker of the power receiving line. And a device for the reactor line is disposed adjacent to the power receiving line, and the branch connection point and the reactor line are connected by a connecting bus bar. 2. The power receiving line is a power receiving line having a disconnector between the cable head and the circuit breaker, and the branch connection point is a branch connection point provided between the disconnector and the circuit breaker. The gas-insulated switchgear according to claim 1, wherein 3. The power receiving line is a power receiving line having an instrument current transformer and a disconnector in order from the cable head side between the cable head and the circuit breaker, and the branch connection point is the instrument transformer. The gas insulated switchgear according to claim 1, which is a branch connection point provided between the flow switch and the disconnector. 4. The gas insulated switchgear according to claim 1, wherein the connecting bus bar is arranged in parallel with the main bus bar.