Measurement method of operating current of DC transfer switch arrester in HV/UHV converter station

Abstract

The invention relates to a high voltageextra-high voltage converter station DC change-over switch lightning arrester action current measuring device, method and application. The measuring device comprises a precise current sensor, a high precision analog-to-digital converter, an automatic frequency calibration unit and a positioning navigation unit. The measuring device employs the measuring method of the invention to measure current, and realizes action current high precision sampling of a single lightning arrester among parallel lightning arresters; in addition, based on the positioning navigation unit, the measuring device realizes automatic frequency calibration, and guarantees current measurement synchronization of all lightning arresters.

Description

technical field

[0001] The invention belongs to the field of electronic technology, and in particular relates to a method for measuring the operating current of a lightning arrester of a DC transfer switch in a high-voltage / ultra-high voltage converter station. Background technique

[0002] The DC transfer switch is the key equipment of the DC field of the HV / UHV DC project. It is mainly used for the conversion of various operating modes of the DC transmission system, the conversion of the grounding system, and troubleshooting. Since the breaking of DC current does not take advantage of the zero-crossing point of AC current like that of AC current, the breaking of DC current must force zero-crossing. However, when the DC current is forced to cross zero, the DC system stores huge energy and needs to be released, and the released energy will generate overvoltage on the circuit, causing the arc between the breaker breaks to re-ignite, resulting in breaking failure .

[0003] ...

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