High voltage power supply for direct current characteristics test of zinc oxide arrester

Abstract

The invention relates to a high voltage power supply for a direct current characteristics test of a zinc oxide arrester, comprising a control circuit module, a PWM generator, an MOSFET driver and a power tube, a high frequency transformer, a protective circuit and a voltage doubling rectifying circuit, wherein the low voltage output end of high frequency transformer is connected with a sampling resister, a current measurement terminal and a current feedback circuit; the output end of the voltage doubling rectifying circuit is connected with a voltage divider, the voltage measurement terminal and the voltage feedback circuit; the control circuit module is provided with a constant voltage control circuit, a constant current control circuit and a cascaded constant voltage / constant current change-over switch; the signal of the feedback circuit is compared with a set signal value, is input in an error amplifier in the constant current control module and enters into a closed loop control system to ensure stable output signals. The invention has stable performance, reliably operates among two modes of constant voltage and constant current, has a built-in protective circuit and can ensure power supply safe operation.

Description

technical field [0001] The invention relates to a high-voltage power supply, in particular to a high-voltage power supply for the DC characteristic test of zinc oxide arresters. Background technique [0002] For the testing of zinc oxide arresters in the power supply facility testing industry, the control box is usually used to control the pressure doubler to form a high-voltage generator, which generates adjustable high-voltage electricity and is applied to both ends of the zinc oxide arrester. The high-voltage generator using this device is complicated by wiring. , heavy weight and huge volume, which brings great inconvenience to the test. In the zinc oxide arrester test test, it is necessary to test the reference voltage U of the zinc oxide arrester under 1mA leakage current 1mA , it is often necessary to manually adjust the output voltage and monitor the output current value repeatedly, and gradually obtain U 1mA , The operation process is cumbersome and the test error...

AI Technical Summary

Problems solved by technology

[0002] The power supply facility testing industry usually uses a control box to control the pressure doubler cylinder to form a high-voltage generator to generate adjustable high-voltage electricity and apply it to both ends of the zinc oxide arrester. The high-voltage generator using this device has complicated wiring. , heavy quality and bulky volume, which brings great inconvenience to the test

In the zinc oxide arrester test, it is necessary to test the reference voltage U of the zinc oxide arrester under the leakage current of 1mA 1mA , it is often necessary to manually adjust the output voltage repeatedly and monitor the output current value to gradually obtain U 1mA , the operation process is cumbersome, and the test error is large. This process can also be completed semi-automatically by the microprocessor, but it is prone to overshoot, the output is not easy to stabilize, and there is even a risk of loss of control.

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