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

A technology of DC characteristics and high-voltage power supply, which is applied in the direction of instruments, measuring electricity, and measuring electrical variables. It can solve problems such as complicated wiring, overshoot, and cumbersome operation process, and achieve overcurrent protection, constant voltage signal stability, and constant current. The effect of signal stabilization
CN101887073BInactive Publication Date: 2012-07-25武汉特试特电气有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
武汉特试特电气有限公司
Publication Date
2012-07-25
Estimated Expiration
Not applicable · inactive patent

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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 ensurepower supply safe operation.
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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 a zinc oxide arrester. Background technique

[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 is complicated due to the wiring , heavy quality, bulky, bring 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-aut...

Claims

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