Dry type air reactor turn-to-turn insulation performance detection system and method

Abstract

The invention discloses a dry type air reactor turn-to-turn insulation performance detection system and method. The system comprises a high-voltage switch cabinet, a variable-frequency test power supply, a test transformer, a reactive power compensation unit, a partial discharge monitoring unit and a tested product unit. 380V three-phase AC current is accessed to the high-voltage switch cabinet. The high-voltage switch cabinet, the variable-frequency test power supply, the test transformer, the reactive power compensation unit, the partial discharge monitoring unit and the tested product unit are connected in turn. The partial discharge monitoring unit comprises a coupling capacitor, measurement impedance and a partial discharge tester. The test product unit comprises a dry type air reactor and an AC voltage measurement unit. The dry type air reactor and the AC voltage measurement unit are connected in parallel. The test transformer excites a resonant loop. The reactive power compensation unit and the tested product unit in the loop are enabled to generate parallel resonance through output frequency of the variable-frequency test power supply. Onsite induced voltage withstanding testing can be performed on the 35kV dry type air reactor so that onsite voltage boosting operation of the reactor can be completed.

Description

technical field [0001] The invention relates to the technical field of dry-type air-core reactors, in particular to a system and method for detecting inter-turn insulation performance of dry-type air-core reactors. Background technique [0002] With the continuous development of my country's electric power industry, how to improve the quality and reliability of power supply has become an important issue that needs to be considered by the power supply system. Reactive power compensation devices play an important role in improving the quality of power supply and have been developed rapidly in recent years; and in order to ensure the reliability of power supply and protect transformers from short-circuit current impact, short-circuit current limiting devices are also widely used. [0003] As a representative device in reactive power compensation device and short-circuit current limiting device, dry-type air-core reactor has the advantages of low loss, low noise, small maintenan...

AI Technical Summary

Problems solved by technology

Most of the reactor failures are short-circuits between turns, which cause the reactor to catch fire and burn, which has a great impact on the safe and stable operation of the power system.

[0005] For the test research on the inter-turn insulation of dry-type air-core reactors, the research methods of domestic scholars can be roughly divided into the following types: one is the induction withstand voltage test method, which directly applies power frequency voltage to the first and last ends of the reactor, It is the closest to the actual operating condition of the reactor, and can effectively assess the ability of the reactor inter-turn insulation to withstand overvoltage, but the reactive power required by this method is very large, and it is difficult to have a test device that can meet the capacity requirements of the test, so that This method is very limited

One is the lightning impulse voltage test method. Due to the limitations of the induction withstand voltage test method, this method is used instead to assess the withstand capacity of the inter-turn insulation of the reactor. However, this method has a relatively short action time and low energy. Difficult to distinguish, and the change of electrical parameters caused by inter-turn short circuit is small, and it is also difficult to distinguish from the lightning impulse waveform

[0006] There is also a high-frequency pulse oscillation method. The research of this method is based on the reactor parameter change phenomenon when the inter-turn insulation breaks down and short-circuits. A high-frequency voltage is applied to the reactor, and the normal reactor and the fault reactor are compared. The applied voltage presents different attenuation constants, so as to judge the inter-turn insulation state of the reactor. This method is only effective for reactors with inter-turn insulation defects, but for reactors with inter-turn insulation hazards but no insulation breakdown. The device cannot realize the detection function

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