Testing device for oiled paper compound insulation frequency domain dielectric spectrum and conductivity test

Abstract

The invention discloses a testing device for an oiled paper compound insulation frequency domain dielectric spectrum and conductivity test. The testing device comprises a high temperature resistance organic glass tank, an upper stainless steel sealing cover plate, a lower stainless steel sealing cover plate, electrode systems, an electric heating blanket, a temperature sensor, a temperature display and control device and the like. The upper end and the lower end of the tank are sealed with the stainless steel sealing cover plates, the tank is filled with transformer oil, the temperature sensor is arranged at the bottom of the tank, the temperature sensor is connected with the temperature display and control device, an air valve and an air pressure gauge are arranged on the upper cover plate of the tank, an oil valve is arranged on the lower cover plate, the electrode systems are arranged at the bottom of the tank, an insulation paper board is arranged between the upper electrode system and the lower electrode system, an upper electrode is connected with a thread micrometer, a measuring electrode in a lower electrode is insulated from a grounding electrode through a polytetrafluoroethylene casing pipe, and the grounding electrode is connected with the lower cover plate. According to the testing device for the oiled paper compound insulation frequency domain dielectric spectrum and conductivity test, a vacuum oiling way is adopted for achieving sufficient immersion of the insulation paper board and insulating oil, a heating device is applied outside the tank to set different environment temperatures, and the oiled paper insulation frequency domain dielectric spectrum and conductivity are accurately tested.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to a test tank body for testing frequency domain dielectric spectrum and conductivity of oil-paper composite insulation. Background technique [0002] Oil-paper composite insulation is the main insulation method of power equipment, and its insulation performance will inevitably decline during operation, which will directly affect the operation reliability of the equipment. In order to obtain the insulation status of oil-paper insulation, at present, the status evaluation is carried out after the AC or DC test with a power frequency of 50 Hz. However, with the improvement of the voltage level and capacity of the equipment, the status evaluation method based on a single insulation parameter can no longer accurately obtain the insulation system. The real status information of the oil-immersed equipment will significantly increase the risk of failure during the operation of the...

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Problems solved by technology

In order to obtain the insulation status of oil-paper insulation, at present, the status evaluation is carried out after the AC or DC test with a power frequency of 50 Hz. However, with the improvement of the voltage level and capacity of the equipment, the status evaluation method based on a single insulation parameter can no longer accurately obtain the insulation system. real status information, resulting in a significant increase in the risk of failure of oil-immersed equipment during operation

[0003] The measurement of electrical conductivity and frequency-domain dielectric spectrum can obtain comprehensive information on the conductance and polarization of oil-paper composite insulation under the action of an applied electric field, which can provide useful help for accurate evaluation of the state of oil-paper insulation, but the measurement results are often affected by ambient temperature, The influence of various factors such as the electrode structure, the contact degree between the electrode and the material, etc.

At present, the theory of dielectric response of oil-paper composite insulation is still relatively weak, and there is no mature test device suitable for joint testing of frequency-domain dielectric spectrum and conductivity of oil-paper insulation, which cannot meet the needs of in-depth research on the dielectric response characteristics of oil-paper composite insulation

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