Isolated high-voltage leakage current measuring method and device

Abstract

The invention provides an isolated high-voltage leakage current measuring method. A high-voltage end current measuring module and a low-voltage end current display module of a high-voltage leakage current measuring device are connected with each other through an optical fiber. Measuring data of the high-voltage end measuring module is transmitted to the low-voltage end display module by the optical fiber so as to isolate the high-voltage end measuring module from the low-voltage end display module. The measuring data is transmitted by the optical fiber, so that the operator can keep away from the high-voltage output end to clearly read the measuring data. The invention also provides an isolated high-voltage leakage current measuring device.

Description

technical field [0001] The invention relates to the technical field of measurement and control of electric power system electronic instruments, in particular to an isolated high-voltage leakage current measurement method and device. Background technique [0002] In the power system, it is often necessary to measure the output current at the high-voltage output end of the high-voltage generator. For example, in the transfer and preventive tests of zinc oxide arresters, it is necessary to measure the output current at the high-voltage side of the DC high-voltage generator. In addition, in the leakage current test of oil circuit breaker and transformer winding, it is also necessary to measure the output current of the high voltage end. [0003] There are currently two ways to measure the output current: [0004] 1. Using a microammeter to measure [0005] Because the microammeter is in the high-voltage field when it works, it cannot be powered from the low-voltage side. Now i...

AI Technical Summary

Problems solved by technology

[0006] (1) The viewing angle of the display screen is not very large, and the operator needs to face up to the display screen of the microammeter to see clearly;

[0007] (2) When there is sunlight, it is basically impossible to see clearly, and the related operations are mostly carried out outdoors. In sunny weather, the readings cannot be seen clearly with the existing leakage current meter under sunlight;

[0008] (3) The display numbers are small, the brightness is low, and it is not easy to see clearly when the distance is greater than 2 meters. When doing the lightning arrester test, the maximum output voltage of the DC high voltage generator is above 150kV, and the safe distance should be at least 2 meters.

Due to the small leakage current, which belongs to the microampere level current, and the complex distribution parameters of the high-voltage generator, the accuracy of this indirect measurement method is very low, which affects the accurate judgment of the measurement status

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