JPS6046605B2 - How to clean gas insulated appliances - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for cleaning gas-insulated electrical appliances.

The line switchgear connected to the gas-insulated busbar is manufactured using dust-proof and dust-proof controls to ensure that the insulation performance of each part is not impaired.
It is assembled in a moisture-proof work room, and once completed, the switchgear for one or two circuits is transported to the site in a fully assembled state. At this time, the busbar to which the switchgear of each line is connected is also separated into the above transportation units, and the separated parts are reassembled on site. However, busbar reassembly is generally carried out outdoors or other places with poor environmental conditions.For this reason, conventionally, reassembly has been carried out in a simple dust-proof room such as a plastic greenhouse, but it is subject to the influence of weather and surroundings. Work is interrupted and cannot run smoothly.

In addition, it is not possible to completely prevent the intrusion of dust and moisture, so cleaning and dehumidification are performed by blowing in dry air after assembly, but it is difficult to completely clean and the work is time-consuming. There was a problem. The present invention has been made in view of the above-mentioned circumstances, and provides a method for cleaning gas-insulated electrical appliances that completely and easily removes dust, moisture, etc. that have entered during assembly.

The feature of the present invention is that the envelope of the assembled gas-insulated electrical appliance is filled with an evaporative cleaning liquid such as liquefied gas, and the interior of the appliance is cleaned by circulating the cleaning liquid inside the envelope through a filter using a pump. The purpose is to send it in and vaporize it.

The present invention will be explained below with reference to embodiments shown in the drawings.

The figure shows, as an example, a method of cleaning the connection part of a sealed bus bar, and shows I
IA and IIB are gas-insulated closed busbars connected via a connection busbar 12.

The hermetically sealed bus bar 11A has an outer sheath 1 whose inside is filled with insulating gas.
3A and a current conductor 14A passing through the jacket 13A. The end of the jacket 13A is sealed with an insulating spacer 15A, and one end of the current conductor 14A is connected to a connector 16A provided on the spacer 15A. Sealed busbar 11
Similar to the above bus bar 11A, B has an outer sheath 13B and this outer sheath 13.
The end of the jacket 13B is sealed with an insulating spacer 15B.
A current conductor 14B is connected to a connector 16B provided at B.

- The sealed busbars 11A and IIB are each transported in a fully assembled state, and are connected to each other by the connection busbar 12 during installation. The connecting bus 12 has an outer sheath 17 and a current conductor 1 provided within the outer sheath.
It has 8. Current conductor 18 is connected between connectors 16A and 16B of busbars 11A and 11B, and jacket 17 is connected between ends of insulating spacers 15A and 15B provided on the busbar jacket. Connection ports 19, 20, and 21 each having a valve are provided in the connecting busbar sheath 17, and a cleaning device described below is connected to these ports. As shown in the figure, the cleaning device 31 has a pump 33 and a filter 34 connected in the middle of a pipe line 32 connecting between the connection ports 19 and 20.
A dry air cylinder 37 is provided with branch pipes 35 and 36 in the pipe section between the pump 33 and the dry air cylinder 37, and one of the branch pipes 35 has a valve 37a.
and a cleaning liquid tank 38 having a valve 38a is connected to the other branch pipe 36.

For example, an evaporative cleaning liquid such as liquefied gas is used as the cleaning liquid.
A valve 33a is provided on the blowing side of the pump 33, and valves 34a are provided before and after a filter 34, and a bypass pipe 39 having a valve 39a is connected to the filter 34. Next, a cleaning method using the above apparatus will be explained.

First, the connection port 19, the dry air cylinder valve 37a, and the filter valve 34a are closed, and the connection ports 20, 21, the pump valve 33a, and the bypass valve 39a are opened, and the cleaning liquid from the cleaning liquid tank 38 is removed from the connection port 20 by the pump 33. 17 will be filled.

By filling the cleaning liquid inside the jacket in this manner, dust adhering to the insulating spacers 15A, 15B1 and the current conductor 18 in the jacket and the inner surface of the jacket floats in the liquid. Note that the connection port 21 must be left open as a fairly intense vaporization occurs at the beginning of filling the cleaning liquid! There is a point. Next, after filling the cleaning liquid, the cleaning liquid tank valve 38a1 bypass valve 39
A is closed, the connection port 19 is opened, and the cleaning liquid inside the jacket is continuously circulated from the connection port 19 through the filter 34 to the other connection port 20 by the pump 33 for an appropriate period of time. As a result of this drying process, the cleaning liquid inside the jacket flows and passes through the filter 34 one after another, and the dust in the liquid is captured by the filter and cleaned. After completing internal cleaning, close the pump valve 33a and close the dry air cylinder valve 37.
a and blows dry air into the outer cover 17 to vaporize the cleaning liquid and discharge it from the connection port 21. After the cleaning liquid has been discharged, the outer cover 17 is vacuum degassed and filled with insulating gas through the same assembly process as in the prior art.

According to this cleaning method, even if dust adheres to various parts inside the outer cover during assembly, it will float in the cleaning liquid that is filled, and the dust will be captured by the filter as the cleaning liquid is circulated by the pump. completely cleaned. Further, since the cleaning liquid is vaporized and discharged by dry air fed into the jacket and dehumidified at the same time, cleaning and dehumidification can be easily and completely carried out without the need for special equipment.

Since cleaning and dehumidification can be carried out completely in this way, the environmental conditions during assembly will not affect much, making the work easier and the construction proceeding smoothly.

As described above, according to the present invention, it is possible to provide a method for cleaning gas insulated electrical appliances that is completely cleansing and dehumidifying, has good workability, and is practical.

[Brief explanation of the drawing]

The figure is a sectional view of a sealed busbar showing an embodiment of the present invention.

Claims (1)

[Claims] 1 The process of filling the inside of the envelope of the assembled gas insulated electrical equipment with an evaporative cleaning liquid such as liquefied gas, the process of circulating the cleaning liquid inside the jacket to clean the inside of the jacket, and the process of discharging and vaporizing the cleaning liquid. A method for cleaning gas insulated electrical appliances, which comprises the step of drying the inside of the outer casing.