JPH02164207A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To reduce the size of a gas insulated switchgear by connecting first and second branch buses with first and second main buses and arranging a circuitbreaker and a disconnecting switch between the first and second branch buses while a metering transformer on the branch bus. CONSTITUTION:A bus section unit comprising a circuitbreaker 1 and disconnecting switches 2A, 2B is arranged between main buses 6C, 6D. Branch bus fixing sections 8A, 8B are arranged on the buses 6C, 6D and three branch buses 7E, 7F are arranged at each fixing section 8A, 8B. The bus 7E is coupled through the disconnecting switch 2A, the gas circuitbreaker 1 and the disconnecting switch 2B with the bus 7F. Furthermore, a metering transformer 4 is arranged on the buses 7E, 7F thus reducing the size of a gas insulated switchgear.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to improvements in gas insulated switchgear.

[Prior art] Fig. 2 shows a bus section unit and an instrument transformer that constitute a gas insulated switchgear (hereinafter abbreviated as GIS) according to the conventional technology disclosed in, for example, Japanese Unexamined Patent Publication No. 61-35772. FIG. 3 is a layout diagram of PT units (A) and (B). A branch bus (7A) is provided for each phase on the main bus (6A) that accommodates three-phase electrical circuits;
A) are each provided with an instrument transformer (4).

The instrument transformer (4) is for regulating the voltage of each line d(11).The part of the main bus bar where this instrument transformer is installed is called a PT unit.Same configuration as above. A main bus (6B) having a PT unit (B) is arranged opposite to the main bus (6A). Main bus (6A
) and the main generatrix (6B) at the bending part of the bidirectional generatrix,
Each phase is connected by a series connection of a branch busbar (7B), a disconnector (2A), a gas circuit breaker (1), a disconnector (2B), and a branch busbar (7C). This part is called the ugly section unit.

[Problems to be Solved by the Invention] In the conventional gas insulated switchgear configured as described above, when this is installed in a substation, the PT unit (A), the bus section unit, and the PT unit (B
) has a total length of several tens of meters, and there was a need to reduce these dimensions and make it more compact.

[Means for Solving the Problems] The gas insulated switchgear of the present invention connects a first branch bus to the electric circuits of each phase of the first main bus, and connects the first branch bus to the first main bus at a predetermined distance. A second circuit is connected to each phase of the opposing second main bus.
A disconnection means is provided, which has a first disconnector, a circuit breaker, and a second disconnector provided between the first branch busbar and the second branch busbar of the corresponding phase, respectively. The first branch busbar and the second branch busbar of the phases are each equipped with an instrument transformer.

[Function] By installing the instrument transformer in the bus section unit provided with the gas circuit breaker, there is no need for a space for installing the PT unit on the main bus bar.

[Example] Fig. 1 shows the configuration of a gas insulated switchgear according to the present invention. In the figure, a bus section unit consisting of a gas circuit breaker (1) and disconnectors (2A) and (2B) is provided between a main bus (6c) and a main bus (6D). Main bus (6C)
A branch busbar attachment portion (8A) bent at right angles is provided on the main busbar (6D), and a branch busbar attachment portion (8B) is similarly provided at right angles on the main busbar (6D). The branch busbar attachment part (8A) is provided with three branch busbars (7E) corresponding to each phase of the three-phase main busbar, and each branch busbar (7E)
An instrument transformer (4) is provided.

Each branch bus (7E) has a disconnect switch (2A), a gas circuit breaker (1
) and the branch busbar attachment part (8B) via the disconnector (2B)
It is connected to the branch busbar (7F) provided in the.

Each branch busbar (7F) is also provided with an instrument transformer (4). In the gas insulated switchgear configured in this way, the main bus electrical circuit is (6C), a branch bus (7E), a disconnector (2A), a gas circuit breaker (1), a disconnector (2B), and a branch bus (7F). ) and the main bus (6D).

[Effects of the Invention] In the gas insulated switchgear of the present invention, the instrument transformer (4) is connected to the branch bus bar attachment portion (8) of the bus section unit.
A) and (8B), so the main bus (6C
) and (6D) do not require space for installing the potential transformer (4). Therefore, the length of the gas insulated switchgear is shortened and the installation space within the substation is saved.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram of a gas insulated switchgear according to the present invention, and FIG. 2 is a layout diagram of a gas insulated switchgear according to the prior art. In the figure, (1) is a gas circuit breaker, (2^) and (2B) are disconnectors, (4) is a voltage transformer, (6C) and (6D) are main busbars, (7E) and (7F) is a branch bus.

Claims (1)

[Claims] (1) A first branch bus that is connected to the electrical circuits of each phase of the first main bus; A first branch bus that is connected to the electrical circuits of each phase of the second main bus that faces the first main bus at a predetermined distance. a second branch busbar, a disconnection means having a first disconnector, a circuit breaker, and a second disconnector provided between the first branch busbar and the second branch busbar of the corresponding phases, and a circuit breaker for each phase; A gas insulated switchgear having an instrument transformer provided in a first branch busbar and a second branch busbar.