Transformer oil paper insulation long-time electric heating combined aging experiment device and method

Abstract

The invention discloses a transformer oil paper insulation long-time electric heating combined aging experiment device and method. An electrode plate of a high-voltage electrode is located in a sealing tank, an electrode stem of the high-voltage electrode extends out of an upper cover plate of the sealing tank, the electrode stem of the high-voltage electrode can move relative to the upper cover plate, and a low-voltage electrode is arranged at the bottom of the sealing tank. An insulation sample is arranged between the high-voltage electrode plate and the low-voltage electrode plate, the sidewall of the sealing tank is provided with a temperature measuring conduit and a ground wire wiring conduit which are communicated with the sealing tank, the temperature measuring conduit is blocked by a first rubber plug, the ground wire wiring conduit is blocked by a second rubber plug, and the temperature sensor shell is embedded into the first rubber plug. An inductive probe of the temperaturesensor is arranged at the bottom of the sealing tank, the grounding wire is embedded into and penetrates through the second rubber plug to be connected with the low-voltage electrode, the oil bath groove heats the sealing tank through heating oil in the oil bath groove, and the high-frequency current sensor is installed on the grounding wire. Accurate data reference can be provided for operationand maintenance decisions of the transformer.

Description

technical field [0001] The invention relates to the technical field of transformer aging experiments, in particular to a transformer oil-paper insulation long-term electrothermal combined aging experiment device and method. Background technique [0002] Power transformers, especially large oil-immersed power transformers, are important equipment for AC-DC transmission projects, and their reliability directly determines the stability and safety of AC-DC power transmission. The insulation system of a power transformer is the basic condition for the normal operation and operation of the transformer. The operating life of the transformer largely depends on the aging state of the oil-paper insulation system. Therefore, carrying out research on the aging of transformer oil-paper insulation is the key to improving the service life of transformers and improving the reliability of power supply. Accurately diagnosing the aging state of oil-paper insulation systems and predicting the l...

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Problems solved by technology

[0006] The patent "transformer oil-paper insulation electrothermal combined aging and partial discharge integrated experimental device" (application number CN201310016098.5 publication number CN103105568B) proposed earlier, this device can provide corona discharge in oil, creeping discharge and air gap discharge model test , the material of the sealed tank is stainless steel to ensure that the tank is at the same potential, but when performing a partial discharge detection test, the shielding effect of the stainless steel tank may make it impossible to detect a small partial discharge, thus reducing the accuracy of partial discharge detection In addition, it is impossible to implement high-speed cameras to shoot along the surface discharge process

The patent "A Transformer Oil-Paper Insulation Electric Heating Combined Aging Experimental Device" (Application No. CN201410341409.X Publication No. CN104076232B) has designed a tank structure with multiple openings, which can directly take out the aged transformer without opening the cavity. Oil sample and gas, and set the UHF sensor interface to detect partial discharge, the test operation is convenient, but the oil sample is heated by a thermocouple, and the heating uniformity cannot be guaranteed. The distance between the thermocouple and the UHF sensor is relatively close, and the cavity Influenced by the complex electromagnetic field in the body, the source of the UHF detection signal is not clear. If the UHF sensor is placed in a high temperature oil sample for a long time, the life of the sensor will also be shortened. In addition, the high heating temperature will also cause the sealing effect Deterioration, which is not conducive to carrying out long-term aging experiments

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