JPS605709A - 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 [Field of Application of the Invention] The present invention relates to a switchgear, and particularly to a switchgear having a load current interrupting disconnector electrically in parallel with a breaker.

[Background of the invention]

In recent important circuits, a load current cutoff disconnector is connected electrically in parallel with the breaker, and when the breaker breaks down or is inspected for maintenance, the load current cutoff disconnector is closed and main circuit operation continues. , a system that allows the circuit breaker to be separated from the main circuit is desired.

[Purpose of the invention]

An object of the present invention is to provide a switchgear having a load current interrupting disconnector having a simple configuration.

[Summary of the invention]

Prior to the present invention, the present inventors considered the following switching device.

Disconnector 3 with one end connected to double main busbars 1 and 2
. The other end of the breaker 7 is connected to the breaker 1 via a current transformer 8.
Connected to one end of 0. Earthing switches 9 and 11 are provided at both ends of the disconnector 10, respectively. Such a circuit configuration is generally known, and even if one of the main busbars 1 should cause an accident, it is possible to continue operation by opening the disconnector 3 and closing the disconnector 4.

Since the load current cutoff disconnector is for bypassing the circuit breaker 7, as shown in FIG. The other end is connected to the insulation lead-out means 14 side of the disconnector 10.

When attempting to separate the breaker 7, use the breaker 3.4.
The operation can be continued by opening the circuit 10, closing the earthing switch 5.9, and closing the load current interrupting disconnector 12 or 13.

However, in this circuit system, two load current interrupting disconnectors 12 and 13 are added to a switchgear of standard configuration, so when configured as a gas-insulated switchgear, the configuration becomes complicated.

FIG. 2 shows a gas insulated switchgear constructed in accordance with FIG. 1. As can be seen from this plan view, two planes perpendicular to the main generatrices 1 and 2 are required.

A standard gas insulated switchgear configured in one plane has a standard configuration as shown in Figure 3 and is widely known, so equivalents to those in Figure 1 will be given the same reference numerals and detailed explanations will be provided. Omitted.

FIG. 4 is a diagram of another gas-insulated switchgear configured in one plane in FIG. 2, as seen along line mm. A connecting conductor 15 is provided with one end connected to the insulation lead-out means 14 side of the disconnector 10 .

A load current interrupting disconnector 12.13 is constructed above the main bus 1.2 in the same way as the disconnectors 3 and 4 shown in FIG. , is connected to the other end of the connecting conductor 15.

When making a gas insulated switchgear in this way, the main busbars 1 and 2
Two planes along the axis were required.

The present invention is characterized in that it can be configured in one plane. The present invention is not limited to gas insulated switchgear, but can also be applied to switchgears using an insulating medium such as insulating oil, but the embodiments shown below are applied to gas insulated switchgears.

[Embodiments of the invention]

First, the circuit configuration will be explained using FIG. 5. Disconnectors 3.4 are provided with one end connected to the main buses 1 and 2, respectively. The other ends of the two disconnectors 3 and 4 are electrically short-circuited, and the separating disconnector 1 is used as a short-circuit conductor between the disconnectors 7 and 7.
7 are connected in series. Further, one load current interrupting disconnector 12 is connected between the short circuit conductor and the insulation lead-out means 14 side of the disconnector 10. There are earthing switches 5 and 9 on both sides of the breaker 7, and there is also an earthing switch 11 on the insulation lead-out means 14 side of the breaker 10, as in the case of FIG. 1. One current transformer 6 is provided between the earthing switch 5 and the breaker 7, and the other current transformer 8 is provided with insulation derivation means from the connection between the disconnector 0 and the load current interrupter 12. It is provided on the 14 side. This current transformer 8 can be used for measuring current, voltage, etc. even when the load current interrupting disconnector 12 is operating.

According to this circuit configuration, only one load current cutoff disconnector 12 is required to have the ability to cut off the load current. A disconnector 17 for simple isolation is added, but this is smaller than one for interrupting load current and can be manufactured at a lower cost. Furthermore, this circuit configuration has a large structural effect as described later.

When separating the breaker 7, the breaker 7 is opened, the disconnectors 10 and 17 are opened, and the load current interrupter 12 is closed. This is the same as the example in Figure 1.

Such a circuit configuration can be used as a gas insulated switchgear as shown in FIGS. 6 and 7.

FIG. 6 is a plan view, and can be constructed of one substantially perpendicular plane orthogonal to the main generatrix lines 1 and 2, which are on the same level and parallel to each other. In detail in FIG. 7, the parts corresponding to the configurations shown in FIGS. 3 and 4 are combined into one.

On the insulation lead-out means side of the disconnector 10, there is a load current interrupting disconnector 12 branch-connected downward, and has a connecting portion reaching the same height as the lower electric circuit of the breaker 7. This connection part is connected to a short circuit conductor 18 that connects the side opposite to the main bus bar of the disconnector 3.4. A separating disconnector 17 is connected between the shorting conductor 18 and the earthing switch 5. In this way, the lower electric path connected to the lower terminal of the vertical breaker 7 has the current transformer 6, the shorting conductor 18, and one end of the load current interrupting disconnector 12 located in a straight line, and furthermore, Since it is arranged to be on the same plane as the upper electric circuit including the disconnector 10, the overall configuration is simplified.

Although in other embodiments the disconnector 10.13 can be vertical, it is preferable to have a flat configuration as described above.

〔Effect of the invention〕

As described above, the present invention connects the separation disconnector 17 between the breaker 7 and the main bus side disconnectors 3 and 4, and provides an insulation lead-out means between the main bus side of the separation disconnector 17 and the disconnector 10. Since the load current interrupting disconnector 12 is provided between the sides, an inexpensive switching device can be obtained with a simple configuration.

Further, the present invention provides an arrangement in which the upper electric circuit and the lower electric circuit of the vertical breaker are integrated into one.
The lower current path includes a current transformer 6 and a short circuit conductor 1.
8 and one end of the load current interrupting disconnector 12 are arranged substantially in a straight line, the whole can be constructed in a two-dimensional manner, resulting in a simple and inexpensive switchgear.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a switchgear according to the prior art, Figure 2 is a plan view of the switchgear corresponding to Figure 1, and Figure 3 is Figure 2 -
■ Linear view, Figure 4 is a ■-■ line view of Figure 2, Figure 5 is a circuit diagram showing one embodiment of the switching device of the present invention, and Figure 6 is the opening/closing device of the present invention corresponding to Figure 5. A plan view showing one embodiment of the apparatus, FIG. 7 is a front view of FIG. 6. 1.2...Main bus bar, 3,4...Disconnector, 6,8...
・Current transformer, 7... Breaker, 10... Disconnector, 12
... Load current interrupting disconnector, 14... Insulation lead-out means, 17... Separation disconnector, 18... Short circuit conductor. Agent Patent Attorney Akio Takahashi Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. One end of the circuit breaker is connected to the first. It is connected to the two main buses through a second disconnector, and the other end of the above-mentioned circuit breaker is connected to the third
In the device connected to the insulation lead-out means via a disconnector, the third disconnector is connected to the insulation lead-out means side end and the first. A load current cutoff disconnector is connected between the second disconnector and the breaker side end of the second disconnector. A gas insulated switchgear characterized in that a disconnector for disconnection is connected between the breaker side end of the second disconnector and the breaker. 2. Two main busbars arranged substantially in parallel, a vertical breaker arranged on one side of the main busbars, and first and second disconnectors each having one end connected to the upper part of the main busbar. and,
Above 1st. a short-circuit conductor connecting the other ends of the second disconnector;
A current transformer disposed between the lower terminal of the breaker and the short circuit conductor, and a third disconnector connected to the upper terminal of the breaker, wherein the opposite end of the third disconnector A load current interrupting disconnector is connected between the short circuit conductors, a separation disconnector is connected between the short circuit conductor and the lower terminal of the breaker, and the disconnector, the first to third disconnectors, and the current transformer are connected between the short circuit conductor and the lower terminal of the breaker. A switching device characterized in that the load current interrupting disconnector and the load current interrupting disconnector are arranged in one substantially vertical plane. 3. The switching device according to claim 2, wherein the connection portion between the current transformer, the short circuit conductor, and the short circuit conductor of the load current interrupting disconnector is arranged substantially linearly. .