JPH04317508A - Gas insulated switchgear directly coupled with transformer - Google Patents

Abstract

PURPOSE:To realize overall downsizing by eliminating branch bus from a gas insulated switchgear coupled directly with transformer. CONSTITUTION:The gas insulated switchgear comprises a transformer 7 filled with insulating oil, a gas side bushing container 16 coupled through an oil-gas bushing 6 with the transformer 7, a circuit breaker 3 connected through a disconnector 2 with a main bus 1, and an arrester 5 connected at one end with the joint of the bushing 6 and the circuit breaker 3, wherein a conductor lead-out port 16a lead out perpendicularly to the axial direction of the bushing container 16 also serves as a branch bus. Consequently, no branch bus is required and the gas insulated device directly coupled with transformer can be arranged compactly while furthermore reliability of the entire system is enhanced because the number of joints is decreased.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a lightning arrester, a circuit breaker, and a bushing container in a gas insulated switchgear directly connected to a transformer.

0002

[Prior Art] For example, FIG.
As shown in Figure 5. Figure 3 shows a single-line connection diagram for one phase, with a circuit breaker (3) connected to the main bus (1) via a bus disconnector (2) and a branch bus (4) for oil-gas separation. A transformer (7) is connected to the branch busbar (4) via a bushing (6), and a lightning arrester (5) is also connected to the branch busbar (4).

FIG. 4 shows a top view of the three-phase configuration of the connections of FIG. The transformer (7) filled with insulating oil and the gas side bushing container (16A) containing the oil-gas division bushing.
), (16B), (16C) are connected and arranged to the transformer (7), and the bushing containers (16A), (16B),
A branch busbar container (14A) on the axial extension of (16C),
(14B), (14C) to the circuit breaker container (13A)
, (13B), and (13C) are connected. FIG. 5 is a side view of FIG. 4, and the container (15) containing the lightning arrester (5) is arranged at right angles to the axial direction of the bushing (6).

0004

[Problems to be Solved by the Invention] Since the conventional transformer-directly connected gas insulated switchgear is constructed as described above, the oil
Container (16A) for storing gas bushing (6), (1
A branch busbar container (14) is required between the surge arrester (5) and the circuit breaker (3), and a branch busbar container (14) is required on the axial extension of the oil-gas bushing (6).
, the distance between the circuit breaker (3) and the transformer (7) becomes long.

[0005] The present invention has been made to solve the above problems, and by omitting the branch bus bar container (14), it is possible to reduce the overall size of the transformer-directly connected gas insulated switchgear. With the goal.

[0006]

[Means for Solving the Problems] A transformer-directly connected gas insulated switchgear according to the present invention includes a transformer filled with insulating oil,
A bushing container on the gas side connected to the transformer through an oil-gas bushing, a circuit breaker connected to the main bus through a disconnector, and a lightning arrester having one end connected to a connection point between the bushing and the circuit breaker. The present invention is characterized in that the conductor outlet is drawn out perpendicularly to the axial direction of the bushing container and the lightning arrester is directly connected to the conductor outlet, so that the conductor outlet also serves as a branch bus bar.

[0007]

[Operation] A conductor outlet (16a) is provided which is drawn out perpendicularly to the axial direction of the bushing container.
is also used as a branch bus bar. The branch busbar (4), which was conventionally provided as a separate unit, is not used.

[0008]

[Embodiment] Fig. 1 is a side view of a transformer-directly connected gas insulated switchgear according to the present invention, in which an oil-gas partition bushing (6) is attached to a transformer (7) filled with insulating oil and insulated. A bushing container (16) is connected thereto. The conductor outlet (16a) of the bushing container (16) is provided in a direction perpendicular to the axis of the bushing container (16).
) is arranged, and the lightning arrester (5) therein is connected to the conductor outlet (16a) in the lower part of the bushing container (16). A conductor outlet (15a) is provided in a direction perpendicular to the axis of the lightning arrester container (15), a circuit breaker container (13) is arranged at the bottom of the lightning arrester container (15), and the circuit breaker (3) is connected to the conductor outlet (15a). 15a).

FIG. 2 shows a cable head tank (8) connected in place of the circuit breaker (3) in FIG. 1, and a power cable (9) is drawn out from the cable head tank (8).

In the embodiment of FIG. 1, the bushing container (16)
The lightning arrester container (15) was placed at the bottom of the lightning arrester (5).
) may be replaced by a circuit breaker or other switch.

Although the embodiment of the present invention shows an example of a three-phase phase separation type, even in the case of a three-phase all-in-one type, the conductor outlet (16a) of the bushing container (16) is arranged in a direction perpendicular to the container axis. Similar effects can be obtained if the conductor outlet (16a) is also used as a branch bus bar.

0012

As described above, according to the present invention, the conductor outlet of the bushing container is provided in a direction perpendicular to the container axis, and the conductor outlet of the bushing container is configured to branch the busbar. This eliminates the need for a separate branch bus bar, allowing for a more compact arrangement, making it possible to create a transformer-directly connected gas-insulated switchgear at a lower cost, and reducing the number of connection points, which has the effect of increasing the reliability of the entire system.

[Brief explanation of drawings]

FIG. 1 is a side view of a transformer-directly connected gas insulated switchgear according to an embodiment of the present invention.

FIG. 2 is a side view of a transformer-directly connected gas-insulated switchgear according to another embodiment of the present invention.

FIG. 3 is a single-line diagram showing a transformer-directly connected gas-insulated switchgear.

FIG. 4 is a plan view showing a conventional example of a transformer-directly connected gas-insulated switchgear.

FIG. 5 is a side view of FIG. 2.

[Explanation of symbols]

1 Main bus line 2 Disconnector 3. Circuit breaker 5 Lightning arrester 6 Oil-gas division bushing 7 Transformer 16 Bushing container 16a Conductor outlet

Claims (1)

[Claims] 1. A transformer filled with insulating oil, a bushing container on the gas side connected to the transformer via an oil-gas bushing, a circuit breaker connected to the main bus bar via a disconnect switch, and the bushing. A lightning arrester whose one end is connected to the connection point with the circuit breaker and a conductor outlet drawn out perpendicularly to the axial direction of the bushing container and the conductor outlet connected directly to the conductor outlet allow the conductor outlet to connect the branch bus bar. A gas insulated switchgear directly connected to a transformer, which is characterized by its dual use.