JPS5943769Y2 - Grounding device for gas insulated electrical equipment - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to the improvement of grounding devices for gas insulated electrical equipment.

As is well known, gas insulated electrical equipment is provided with a grounding device for the convenience of inspecting the live parts inside the sealed container, and a pressure detection device to detect the voltage of the live parts.

By the way, in the past, the grounding device and the pressure testing device were provided separately and independently, which inevitably required a large amount of space and required a large amount of materials.

This proposal aims to eliminate the above-mentioned drawbacks by insulating the grounding contact and shield electrode in the grounding device, and using a single insulating bushing to lead them out from the end cap container through the free space. It is.

The following description will be made based on the embodiments shown in the drawings.

1 is a sealed metal container at ground potential; 2 is a cup-shaped metal end lid container that covers the cylindrical opening of the container 1; 3 is a live part conductor that connects the container with SF6 gas etc. sealed in the container. It is covered with insulating gas 4.

Reference numeral 5 denotes a movable grounding contact used for grounding the live part conductor 3, which is operated by a lever 6 and positioned approximately at the center of the end cover container 2.

T is a fixed contact for grounding provided on conductor 3, and 8
indicates a sliding contact.

Reference numeral 9 denotes shield electrodes of the contacts 5 and 8, and 8 and 9 are attached to the containers 1 and 2 insulated with an insulating spacer 10 and connected to the internal conductor of the insulating bushing 12 via a connecting lead 11. It is connected.

The insulating bushing 12 is led out from an idle space of the end cover container 2, that is, a space on the side opposite to the lever 6 when viewed from the contact 5.

The internal conductor of the bushing 12 has an external terminal 13 at its tip.
is installed.

The movable contact 5 is insulated from the operating lever 6 by an insulating iron 18.

A voltage detector, a ground terminal, a measuring device, etc. are connected to the external terminal 13 as necessary.

In the illustrated embodiment, a changeover switch 14 linked to the movable contact 5 is connected to the external terminal 13, and a switch 14 is connected to one contact side of the switch 14 between the shield electrode 9 and the electrode on the fixed contact 1 side. Capacitor capacitance C1 and capacitor C formed between shield electrode 9 and container 2
A voltage detector 15 using the terminal 2 is connected, and the other contact side is connected to a ground terminal 16.

The contacts of the voltage detectors 15g4Il in the changeover switch 14 are, for example, in the disconnected state shown by the movable contact 5, that is, the normal use state -cm path, and are open otherwise, and the contacts on the ground terminal 16 side are closed when the movable contact is in the closed state. Normally closed contacts and normally open contacts are used, respectively.

In the illustrated embodiment, the changeover switch 14 is used in conjunction with the operation of the movable contact 5, but it may also be used as an independent switch with a well-known interlock established between the movable contact 5 and the changeover switch 14. Of course.

Note that 17 is a removable grounding short-circuit piece provided as necessary, and 18 is an insulating iron.

Next, the operation will be explained.

In the above configuration, when the movable contact 5 is in an open state, the voltage of the shield electrode 9I/i charging part conductor 3 is changed to the capacitance C1.
*The voltage is divided by C2, and this voltage is led out to the external terminal 13.

At this time, the electrode 9 is connected to a voltage detector 15 by a changeover switch 14, and the voltage of the charged part conductor (main circuit) is applied to the voltage detector 15 and the voltage is measured.

□Also, when the movable contact 5 is in a closed state, the live part conductor 3 is connected to the external terminal 13.

Therefore, if the terminal 13 is grounded via the changeover switch 14 or the like, the main circuit can be inspected safely.

Furthermore, if the external terminal 13 is grounded, connecting a measuring device here will measure the insulation resistance of the live part (main circuit).

Can measure contact resistance, contact operation of circuit breaker contacts, etc.

In this way, the grounding contact 5 and the shield 9 are insulated from the container and led out all at once, so the external terminal 13
A voltage detector 15, a ground terminal 16, and a measuring device can be freely connected to the terminal.

As described above, in accordance with the present proposal, the grounding contact and this shield in gas-insulated electrical equipment are insulated from the container, and they are electrically led out from the idle space to the external terminal outside the container using a single insulating bushing. Therefore, the shield can be used also as a pressure-detecting electrode, and the insulating bushing for extraction can be removed with just one piece, making it possible to reduce the size of the device and simplify it, thereby saving on materials.

Further, using the external terminal, it is possible to detect the voltage of the charging part, measure the insulation resistance and contact resistance of the main circuit, and measure the contact operation of the circuit breaker.

Moreover, it has extremely practical effects as a grounding device for gas-insulated electrical equipment, such as making effective use of idle space and further promoting downsizing of the device.

[Brief explanation of drawings]

The figure is a side sectional view showing one embodiment of the present invention. 1.2... Sealed metal container, 3... Live part conductor, 4... Insulating gas, 5... Movable contact for grounding, 6... ...Lever, 1...
・Fixed contact for grounding. 8... Sliding contact, 9... Shield electrode for grounding section, 10... Insulating spacer, 11...
...Lead. 12... Insulation bushing, 13... External terminal, 14... Changeover switch, 15...
・Voltage detector. 16...Grounding terminal, 17...Grounding shorting piece, 18...Insulating rod -C1tC2...
...Capacitance.

Claims (1)

[Scope of utility model registration request] A gas-insulated electrical device characterized in that a grounding contact and its shield electrode are each insulated and attached to a closed container, and these are electrically led out from an idle space to the outside of the container using a single insulating bushing. Equipment grounding device.