JPH11144969A - Dust removal in stationary induction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of dust removal in a stationary induction apparatus, by which dust removal in a stationary induction apparatus can be performed efficiently in a short period of time by reversing plural times in every specified period of time the liquid flow in a circulating circuit which is provided with a filter for dust removal in a stationary induction apparatus containing liquid cooling medium. SOLUTION: Liquid cooling medium circulated by operating a pump 42 while valves 51 and 52 are opened, and valves 52 and 54 are closed. In this situation, a filter 44 removes dust floating in the liquid cooling medium. Keeping the situation, the circulation is continued for about one hour. Then, after the pump 42 is stopped, the valves 51 and 52 are closed, and the vales 53 and 54 are opened, and the pump 42 is started to operate again. In this situation, a filter 44 removes dust floating in the liquid cooling medium, that is the dust removal inside apparatus is made by allowing the cooling medium to flow in the opposite direction to the former case. By repeating the procedure plural times, dust inside the stationary induction apparatus that cannot be removed with a unidirectional flow can be removed as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing method for a stationary induction device containing a liquid refrigerant such as oil.

[0002]

2. Description of the Related Art FIG. 3 is a schematic view for explaining a conventional dust removing method for a stationary induction device containing a liquid refrigerant such as oil. In the stationary induction electric tank 1, a stationary induction electric main body 2 and a liquid refrigerant 3 which is a cooling medium for cooling and insulating the stationary induction electric main body 2 are accommodated. The circulation circuit 4 for circulating the liquid refrigerant 3 includes a pipe 41 communicating with the upper part of the stationary induction tank, a pump 42 for oil circulation connected to the pipe, and a pipe 43 communicating with the lower part of the stationary induction tank. It is composed of a dust filter 44 connected to the pipe.

In such a configuration, by driving the pump 42 of the circulation circuit to circulate the liquid refrigerant in the static induction tank, the dust adhering to the surface of the static induction main body 2 is removed by the filter 44. In addition, the electric insulation performance inside the stationary induction device is ensured.

[0004]

The conventional dust-removing method for a stationary induction device containing a liquid refrigerant such as oil and the like is configured as described above, and only circulates in one direction in a circulation circuit. There is a problem that it is not possible to remove dust and dust, and it takes a very long time to remove dust from a specific place in oil and remove it.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and a method for removing dust from a liquid refrigerant-containing stationary induction device that can efficiently remove dust inside the stationary induction device in a short time. It is something to offer.

[0006]

In order to achieve the above object, the flow of a circulation circuit having a dust removing filter of a stationary induction induction device with liquid refrigerant is reversed a plurality of times at regular intervals.

[0007]

According to the present invention, by reversing the flow, the one-way flow is shaded by the flow, and the dust that cannot be released into the liquid is released into the liquid by the reverse flow. The dust trapped in the middle of the flow path can be released into the liquid by the reverse flow.

An embodiment of the present invention will be described below with reference to FIG. In this configuration, valves 51 to 54
And bypass pipes 45 and 46 are provided. The other configuration is the same as that of the conventional example.

In such a configuration, first, the valve 5
The pump 42 is operated by opening the valves 1 and 53 and the valves 52 and 54 are closed to circulate the cooling medium. At this time, the liquid refrigerant circulates from the pump 42 to the filter 44, the valve 51, the pipe 43 communicating with the lower part of the stationary induction device, the stationary induction body 2, the pipe 41 communicating with the upper part of the stationary induction apparatus, and the valve 53 in this order. The dust released in the refrigerant is removed by the filter 44. In this state, circulation is performed for several tens of minutes to one hour.

Next, after temporarily stopping the pump 42, the valve 5
1 and 53 are closed, the valves 52 and 54 are opened, and the pump 42 is started again. At this time, the liquid refrigerant flows from the pump 42 to the filter 44, the valve 52 and the bypass pipe 45, the pipe 41 communicating with the upper part of the stationary induction electric appliance, the pipe 43 communicating with the lower part of the stationary induction electric appliance 2, and the valve 54.
Then, the dust circulates in the order of the bypass pipe 46, and the dust liberated in the liquid refrigerant is removed by the filter 44. In other words, dust is removed by flowing backward in the stationary induction device. By repeating this operation a plurality of times, dust in the stationary induction device that cannot be removed by one-way flow is also removed.

FIG. 2 shows another embodiment of the present invention. In this configuration, a pump that can rotate in the reverse direction is used, and valves 55 to 58 and bypass pipes 47 and 48 are provided. When the pump 42 is rotating forward, the valve 5
5 and 56 are opened and the valves 57 and 58 are closed. In this case, the liquid refrigerant is supplied from the pump 42 to the valve 56 and the filter 4.
4, a valve 55, a pipe 4 communicating with the lower part of the stationary induction device
3, circulating in the order of the stationary induction device main body 2 and the piping 41 communicating with the upper portion of the stationary induction device, and removing the dust released in the liquid refrigerant by the filter 44. In this state, circulation is performed for several tens of minutes to one hour.

Next, after temporarily stopping the pump 42, the valve 5
The valves 5 and 56 are closed, the valves 57 and 58 are opened, and the pump 42 is again started to rotate in the reverse direction. At this time, the liquid refrigerant is pump 4
2, a pipe 41 communicating with the upper part of the stationary induction device, a stationary induction body 2, a pipe 43 communicating with the lower part of the stationary induction appliance, a valve 58 and a bypass pipe 47, a filter 44, a valve 57 and a bypass pipe 48 circulate in this order. The dust released in the liquid refrigerant is removed by the filter 44. Repeating this operation a plurality of times is the same as in the first embodiment. According to this embodiment, there is an effect that the length of the bypass pipe can be further shortened in addition to the dust removing effect.

[0013]

According to the dust removing method of the present invention described above,
Since the liquid refrigerant is reversed and circulated several times at regular intervals, in one-way circulation, dust or other foreign matter adhering to the surface of the stationary induction device body that has become stuck in the flow or stuck It can be released into the liquid, and the inside of the stationary induction device can be purified in a short time.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of a dust removing method for a stationary induction device according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of another embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a conventional example.

[Explanation of symbols]

1 ... stationary induction electric tank, 2 ... stationary induction electric appliance main body, 3 ...
Liquid refrigerant, 4 circulating circuit, 41, 43 pipe, 42 pump, 44 filter, 45, 46, 47, 48 bypass pipe, 51, 52, 53, 54, 55, 56, 57,
58 ... Valve.

Claims (1)

[Claims] A stationary induction electric appliance main body and an insulating liquid refrigerant are stored in a stationary induction electric tank, a circulating cooling circuit for the insulating liquid refrigerant is provided, and a filter for removing foreign substances is disposed in the circulation circuit. A dust removal method for a stationary induction electric device, wherein the dust removal is repeated by reversing the direction of flow of the insulating liquid a plurality of times at regular intervals during dust removal.