Long-term electrothermal combined aging experiment device and method for transformer oil-paper insulation

Abstract

The invention discloses a transformer oil-paper insulation long-term electrothermal combined aging experiment device. The electrode plate of the high-voltage electrode is located in a sealed tank, the electrode rod of the high-voltage electrode protrudes from the upper cover plate of the sealed tank, and the electrode rod of the high-voltage electrode can be opposite to the The upper cover plate moves, the low-voltage electrode is set at the bottom of the sealed tank, an insulating sample is provided between the high-voltage electrode plate and the low-voltage electrode plate, and the side wall of the sealed tank has a temperature measurement conduit and a ground wire wiring conduit connected to the sealed tank. The temperature measurement conduit is blocked by the first rubber stopper, the ground wire wiring conduit is blocked by the second rubber stopper, the temperature sensor housing is embedded in the first rubber stopper, the sensing probe of the temperature sensor is placed at the bottom of the sealed tank, the ground wire is embedded and The low-voltage electrode is connected after passing through the second rubber plug, the oil bath heats the sealed tank through the internal heating oil, and the high-frequency current sensor is installed on the grounding wire. The invention can provide accurate data reference for the operation and maintenance decision 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 electric heating 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 tests , 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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