Sealing leakage test device for oil-immersed transformer

Abstract

The invention discloses a sealing leakage test device for an oil-immersed transformer. The device comprises an oil pump, a control unit, a pressure gauge and a remote control switch, wherein an oil tank is connected with the oil pump of the sealing leakage test device through a pipeline; the control unit is arranged on the oil pump; valves are mounted at outlets of both the oil pump and the oil tank; the pressure gauge is arranged on the pipeline; the control unit comprises two outgoing lines, one of the outgoing lines is connected with a power supply, the other outgoing line is connected with an oil pump motor, and the control unit controls the working state of the oil pump according to a standard product leakage test pressure value or the pressure of a pressure relief valve; and the remote control switch is mounted at a power supply input end. The sealing leakage test device has the advantages of simplicity and flexibility in operation, high detection rate, adjustable test pressure, automation in control, remote power interruption and wide application range and is low in investment, applicable to products of all voltage classes and beneficial to the improvement on the product quality.

Description

[0001] technical field [0002] The invention relates to a sealing leak test device for an oil-immersed transformer, which belongs to the technical field of transformer manufacturing. Background technique [0003] Most conventional oil-immersed transformers are leak-tested by air pressure leak test or oil tank static pressure leak test. 35KV and below low-voltage transformer seal leak test adopts two methods of air pressure and static pressure leak test. The national standard of 110KV and above transformer products has the requirement of partial discharge capacity. Air pressure leak test will increase the gas content in the transformer, which can cause partial discharge In order to avoid the possibility of increasing the quantity, the method of static pressure leak test is generally not used for air pressure leak test. The national standard of static pressure leak test stipulates that the 10KV seal test time is 12 hours without leakage, the 35KV seal test time is 24 hour...

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Problems solved by technology

[0004] Purpose of the invention: Aiming at the above two sealing leak testing methods, there are many problems in the process of use. The air pressure leak test is relatively simple and can only be used for low-voltage products. When the box edge is an air cushion, the leakage point cannot be found, causing no Qualified products leave the factory, static pressure leak test is suitable for products of all voltage levels, the pipeline is longer, the occupied area is larger, the degree of oil pollution is greater, and the work intensity is also greater. For the same model, at least three static pressure oil tanks should be built. Conventional transformer oils are No. 10, No. 25, and No. 45. In addition, users have special requirements for oils from different manufacturers, and the number of static pressure oil tanks will be more. The product is sealed and tested for leaks at the same time, so there are more ground pipelines, the operation is very difficult, and it is easy to make mistakes

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