JP7448363B2 - How to reuse insulation oil - Google Patents

Description

The present invention relates to a method for reusing insulating oil used in oil-filled electrical equipment such as transformers.

Conventionally, when overhauling oil-immersed electrical equipment such as oil-filled power transformers, the insulating oil is first extracted from the electrical equipment, maintenance and inspection of the electrical equipment is performed, and then the insulating oil extracted from the electrical equipment is purified. It is now back to electrical equipment again. (See Patent Document 1 below)

JP2002-15922

However, the device described in Patent Document 1 circulates the insulating oil between the oil collection tank 12 and the purification tower 16 to purify it, so metal powder, sludge, etc., which tend to settle, accumulate at the bottom of the oil collection tank 12, so that it cannot be completely cleaned. cannot be removed. Furthermore, since the connecting pipe 10 is shared for oil removal and oil return, there is a possibility that metal powder and sludge may adhere during oil removal. Therefore, when the purified insulating oil in the oil collecting tank 12 is returned to the overhauled electrical equipment, there is a possibility that sludge adhering to the connecting pipe 10 or sludge accumulated at the bottom of the oil collecting tank 12 may be mixed in. There is.

The present invention can solve the above-mentioned problems and provides a method that can reliably purify sludge and the like in insulating oil.

The invention according to claim 1 provides a step of transferring insulating oil stored in a tank of an existing oil-filled electrical device from the tank to an oil treatment tank by an oil supply pipe whose pressure is reduced by a vacuum pump ; A removal process in which water and cracked gas are removed by spraying insulating oil from a nozzle attached to the tip of the oil pipe in the oil treatment tank, and the insulating oil contained in the insulating oil is reduced by reducing the pressure inside the oil treatment tank with a vacuum pump. A degassing step to further remove water and cracked gas , and after the degassing step, the insulating oil and new insulating oil for replenishment are fed with an oil pump to remove solids contained in the insulating oil. 1. A method for reprocessing insulating oil, the method comprising: filtering the insulating oil with a filter, and then pouring the oil into a tank of the oil-filled electrical equipment.

According to the invention as claimed in claim 1, after water and cracked gas are removed in a degassing step, electrical equipment is filled with insulating oil that has been filtered to remove solids such as carbon and sludge using an oil pump. This prevents the contamination of solids such as metal powder, carbon, and sludge.

FIG. 2 is a configuration diagram of an insulating oil reprocessing process according to an embodiment of the present invention.

An embodiment of the present invention will be described using FIG. 1. FIG. 1 shows the configuration of an insulating oil reprocessing process according to an embodiment of the present invention. In FIG. 1, A is an oil-filled electrical device such as a transformer, 1 is a case of the oil-filled electrical device A, and the case 1 houses an electrical device body including a coil, an iron core, etc., and insulating oil.

When overhauling the oil-filled electrical equipment A, put the oil pipe 2 into the case 1, open the valve 3, and drive the vacuum pump 4 to reduce the pressure inside the oil treatment tank 5. By opening the connected valve 6, the insulating oil in the case 1 is transferred to the oil treatment tank 5. At that time, the water contained in the insulating oil is removed by spouting the insulating oil in the form of a shower or mist from the nozzle 7 attached to the tip of the oil supply pipe 2 (insulating oil discharge part) in the oil treatment tank 5. Decomposition gases are removed. After the transfer of the insulating oil is completed, the main body of the electrical equipment consisting of the case 1, coil, iron core, etc. is overhauled.

After the insulating oil in the case 1 is transferred to the oil treatment tank 5, the valve 6 is closed and the pressure inside the oil treatment tank 5 is reduced to a predetermined pressure using the vacuum pump 4. By continuing to reduce the pressure with the vacuum pump 4, moisture, cracked gas, etc. contained in the insulating oil in the oil treatment tank 5 are further removed from the insulating oil. A pressure gauge 8 attached to the oil treatment tank 5 can measure the pressure inside the oil treatment tank 5.

After the removal of moisture, cracked gas, etc. from the insulating oil is completed, when filling the oil-filled electrical equipment A that has been overhauled with the insulating oil, the valve 9 is opened and the inside of the oil treatment tank 5 is brought to atmospheric pressure. After that, the flow path from the oil treatment tank 5 to the filter 11 of the three-way valve 10 is opened, the valves 12 and 13 are opened, and the oil feed pump 14 is driven to reduce the insulation inside the oil treatment tank 5. The oil is filtered by a filter 11 to remove solids such as carbon and sludge.

Subsequently, the insulating oil from which the solid content has been removed by the filter 11 is poured into the case 1 through the oil supply pipe 15. In addition, due to adhesion to the electrical equipment body including the iron core, the oil treatment tank 5, each piping, etc. during the insulating oil extraction process to the oil treatment tank 5, the amount of filtered insulating oil is less than the amount of oil injected into the case 1. Therefore, the flow path from the new oil tank 16 of the three-way valve 10 to the filter 11 is opened, and the oil feed pump 14 is driven to filter the new insulating oil in the new oil tank 16 through the filter 11 and lubricate it. This will replenish the shortage.

As explained above, the insulating oil from which water and decomposed gas have been removed is filtered to remove fixed components such as carbon and sludge, and the oil is directly poured into the case 1 of the overhauled oil-filled electrical equipment. , it is possible to prevent fixed components such as carbon and sludge from being mixed in during the reprocessing process of the insulating oil.

Furthermore, the oil treatment tank 5 is equipped with a heating device such as a heater, and the vacuum pump 4 reduces the pressure inside the oil treatment tank 5 while heating the insulating oil in the oil treatment tank 5 to a predetermined temperature. Moisture, cracked gas, and the like contained in the insulating oil can be efficiently removed without being affected.

It can be applied to reuse insulating oil used in oil-filled electrical equipment such as transformers.

1 Case 2 Oil supply piping 3, 6, 9, 12, 13 Valve 4 Vacuum pump 5 Oil treatment tank 7 Nozzle 8 Pressure gauge 10 Three-way valve 11 Filter 14 Oil supply pump 15 Oil supply piping 16 New oil tank A Oil-filled electrical equipment

Claims (1)

A step of transferring insulating oil contained in a tank of an existing oil-filled electrical device from the tank to an oil treatment tank by an oil supply pipe whose pressure is reduced by a vacuum pump, and an oil supply pipe in the oil treatment tank . A removal step in which water and decomposed gas are removed by spraying insulating oil from a nozzle attached to the tip of the insulating oil, and water and decomposed gas contained in the insulating oil are further removed by reducing the pressure inside the oil treatment tank with a vacuum pump. After the deaeration process and the deaeration process are completed, the insulating oil and new insulating oil for replenishment are sent with an oil pump, and after being filtered with a filter that removes solids contained in the insulating oil , A method of reusing insulating oil by including an oil purification process that lubricates the tank of oil-filled electrical equipment.

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