Device for testing high voltage large-capacity electrical apparatus dielectric loss tangent value

Abstract

The invention discloses a device for measuring the dielectric loss angle tangent value of high-voltage high-capacity electric equipment. The device comprises a voltage-applying device, a transformer and an electric reactor which are connected in series, wherein the three devices are connected in series with tested electric equipment and a standard capacitor which are connected in parallel to form a serial LC resonance circuit; the tested electric equipment is a tested product; the tested product and the standard capacitor in the serial LC resonance circuit are respectively connected in series with a current transformer; and the current transformer is connected with a testing analysis system which carries out detection, analysis and processing of the current signal collected by the current transformer. The device has simple and reasonable structure and simple use and operation, and can greatly reduce the power capacity of a high-voltage voltage-applying device used in testing; moreover, the device can carry out direct, convenient and accurate testing of the dielectric loss angle tangent value of high-voltage high-capacity electric equipment on the spot.

Description

technical field [0001] The invention relates to a test device for high-voltage aspects of electrical equipment, in particular to a device capable of directly and conveniently testing the dielectric loss tangent value of high-voltage and large-capacity electrical equipment on site. Background technique [0002] For the installed or running high-voltage electrical equipment (or on-site electrical equipment), the relevant electrical regulations stipulate that various electrical parameters of the electrical equipment should be tested or tested on a regular or irregular basis. Among them, the dielectric loss angle The test of the tangent value, namely tanδ value, is one of the important electrical parameters tested. [0003] At present, the usual method for testing the tanδ value is: use a set of 50Hz AC voltage device with a large capacity that can output a large power and a sufficiently high voltage, and apply a voltage from 0V to the rated voltage of the electrical equipment t...

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Problems solved by technology

However, this ultra-low frequency pressurization device with a frequency of 0.1 Hz has the following two disadvantages: ① At present, the test voltage V can only reach a maximum of about 100 kv, which cannot be higher; ② The value of tanδ at a frequency of 0.1 Hz is different from that of people It is not yet determined whether the tan value measured at the customary frequency at 50Hz corresponds exactly, lacking theoretical basis and more actual data

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