Pure capacitive electromagnetic type voltage transformer induction withstand voltage tester

Abstract

The invention discloses a pure capacitive electromagnetic type voltage transformer induction withstand voltage tester. The pure capacitive electromagnetic type voltage transformer induction withstand voltage tester comprises a variable frequency power source, an isolation transformer, and a compensation inductor. Mains supply is connected to the variable frequency power source; the variable frequency power source rectifies the mains supply into direct current, and then performs inversion; frequency-adjustable alternating current of 0 to 150 V is output through a series of voltage stabilization control; the variable frequency power source outputs variable frequency alternating current to the isolation transformer; the isolation transformer adjusts an output voltage range; the isolation transformer is connected to a secondary winding a2*1 of an electromagnetic type voltage transformer; secondary windings a1*1 and a2*2 of the electromagnetic type voltage transformer are connected in series; a1 and x2 are short-circuited; the a2*1 is connected in parallel with the compensation inductor for reactive power compensation; and a high voltage tail end of the output of the isolation transformer is connected in series with an ampere meter for detecting output current of an instrument. The pure capacitive electromagnetic type voltage transformer induction withstand voltage tester carries a fixed inductor, has a small volume, and light weight, reduces loss, saves resources and can realizes multiple purposes.

Description

technical field [0001] The invention relates to an electromagnetic voltage transformer induction withstand voltage tester, in particular to a pure capacitive electromagnetic voltage transformer induction withstand voltage tester, which belongs to the technical field of electric detection instruments. Background technique [0002] The iron core of the electromagnetic voltage transformer induction withstand voltage tester is close to saturation at the power frequency rated voltage, and then the excitation voltage is raised to a voltage value that is more than twice the rated voltage to saturate the iron core, and the no-load current will increase sharply. To the extent that it cannot be allowed, the test frequency is generally selected to be about 150Hz; the traditional triple frequency frequency is fixed at 3 points. The disadvantage of the electromagnetic voltage transformer induction withstand voltage tester is that the inductance is not easy to configure to the optimal poin...

AI Technical Summary

Problems solved by technology

Of course, you can bring an adjustable inductor. For such a large current, the adjustable inductor is bulky, not easy to carry, and it is very noisy.

There must be errors in compensation, and it is not easy to make up to the best, which will increase the output power of the instrument

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