Test device and test method for high-voltage dielectric loss

Abstract

The invention discloses a test device for high-voltage dielectric loss, and relates to a test device. The test device comprises a sine wave output variable frequency power source, a voltage boosting device, a high-voltage standard capacitor, non-grounded test equipment, a high-voltage current sampling isolation unit, a dielectric loss measuring unit, grounded and tested equipment and a display control unit, wherein the sine wave output variable frequency power source can output 0 to 300V and 40 to 70Hz sine waves; the voltage boosting device is used for boosting voltage and connected with the sine wave output variable frequency power source; the high-voltage standard capacitor, the non-grounded test equipment and the high-voltage current sampling isolation unit are connected with the voltage boosting device respectively and are mutually connected in parallel; the dielectric loss measuring unit is simultaneously connected with the high-voltage standard capacitor, the non-grounded test equipment and the high-voltage current sampling isolation unit and is used for amplifying, filtering, synchronously sampling and calculating a tested signal; the grounded and tested equipment is connected with the high-voltage current sampling isolation unit; and the display control unit is respectively connected with the dielectric loss measuring unit and the sine wave output variable frequency power source and is used for controlling a user operation instruction and displaying a measurement result. Due to the structure, the high-voltage dielectric loss test device can have the function of testing the dielectric loss of positive / negative wires at the same time.

Description

【Technical field】 [0001] The invention relates to a test device and a corresponding test method, in particular to a high-voltage dielectric loss test device and a test method for measuring the high-voltage dielectric loss of electric equipment. 【Background technique】 [0002] In order to check the operation status and installation quality of power equipment and ensure the safe and normal operation of power equipment, the measurement of high-voltage dielectric loss must be carried out during the handover test, preventive test and maintenance process of the project, so the high-voltage dielectric loss test is a guarantee. Important measures for the quality and safe operation of power equipment transportation, installation, and maintenance. [0003] At present, due to the limitations of high-voltage isolation technology, the dielectric loss test of the grounded test product at the rated voltage can only be conducted in the positive connection method, so that the field equipment...

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Problems solved by technology

[0003] At present, due to the limitations of high-voltage isolation technology, the dielectric loss test of the grounded test product at the rated voltage can only be conducted in the positive connection method, so that the field equipment must open the grounding switch, which brings cumbersome and unsafe operations to the field. When overhauling a generator in a power plant, a dielectric loss test must be done on the stator of the generator. The tester needs to lift the core of the generator, and then conduct a dielectric loss test using the positive connection method. This requires a lot of manpower and material resources and prolongs the entire overhaul project. duration

There are also a small number of dielectric loss testers on the market that can perform positive / reverse connection tests, but this dielectric loss tester can only perform positive / reverse connection tests at voltages below 10kV, and reverse connection tests cannot be performed at test voltages exceeding 10kV, so , when the test voltage exceeds 10kV for high-voltage dielectric loss test, usually only positive wiring measurement can be done, so that many grounding equipment on site cannot be used for dielectric loss test at rated voltage

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