A virtual medium loss device and its detection method

Abstract

The invention relates to a virtual dielectric loss device and a detecting method thereof. The virtual dielectric loss device comprises a voltage proportion conversion module, a precise phase shifting module, a precise current amplifying module and a control module. The voltage proportion conversion module, the precise phase shifting module and the precise current amplifying module are connected in sequence, and the control module is respectively connected with the precise phase shifting module and the precise current amplifying module. The method comprises the steps that firstly, a high-voltage signal output from the high-voltage end of a dielectric loss tester to be detected is converted into a low-voltage signal; secondly, the converted voltage signal is processed through the phase shifting module to obtain a needed phase position; thirdly, the signal output through the phase shifting module is output to become a current signal amplified through the precise current amplifying module according to the demands; fourthly, the output current signal is input to the measuring end of the dielectric loss tester to be detected; fifthly, different dielectric loss factors are simulated through phase shifting, and different capacitances are simulated through current amplifying. The virtual dielectric loss device is fast and convenient to operate, and the dielectric loss tester is effectively detested / corrected.

Description

technical field [0001] The invention relates to an electric power test device and a method thereof, in particular to a virtual medium loss device and a detection method thereof. Background technique [0002] To judge the insulation state of capacitive equipment in the power system is to detect the dielectric loss factor. The degradation of insulation performance, such as insulation damp, insulation oil pollution and insulation aging, will directly lead to the increase of dielectric loss factor. While detecting the dielectric loss factor, the data of the capacitance change reflecting the fault state of the equipment can be obtained. The existing method of detecting the dielectric loss factor generally applies a test voltage of 10kV, which cannot truly reflect the insulation condition of the equipment during operation. Dissipation factor detection test qualified equipment under operating conditions sometimes have faults, not only that some defects can not be found through the...

AI Technical Summary

Problems solved by technology

The disadvantage of the standard produced by this method is: when the high-voltage standard capacitor has a large capacity, the capacitance value is unstable, resulting in an unstable value of the dielectric loss factor, and the value of the capacitance is single, so it is difficult to increase the rated voltage of the standard.

Due to the manufacturing process of high-voltage standard capacitors, as the capacitance increases, the stability becomes more and more difficult to guarantee

It is very difficult to make a dielectric loss factor standard with a rated voltage of 10kV and a capacitance of more than 10nF by using a capacitor in series with a resistor, and it is even more difficult to achieve the calibration of a rated voltage dielectric loss tester.

[0004] To sum up, the current traditional dielectric loss factor standard has obvious deficiencies in the working principle and calibration method, and it is difficult to meet the detection / calibration requirements of the dielectric loss tester

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