Dynamic resistance measuring method of high-voltage circuit breaker

Abstract

The invention provides a dynamic resistance measuring method of a high-voltage circuit breaker. The dynamic resistance measuring method comprises the steps that: an industrial control computer controls a charging module to charge a supercapacitor to a specified voltage; the supercapacitor is used for supplying power to a circuit breaker, and acquiring voltages at both ends of a standard resistor and voltages at both ends of a circuit breaker; the circuit main loop is switched on and sends out a signal to control a thyristor to be conducted, and voltages at both ends of the circuit breaker anda voltage on a shunt are measured; a moment with the voltages at both ends of the standard resistor greater than 0 is regarded as a timing starting point, a moment with the voltages at both ends of the circuit breaker approximately equal to 0 is regarded as a timing end point, and a closing resistor pre-insertion time is calculated; and the industrial control computer displays a calculation resultby means of a display. The dynamic resistance measuring method adopts an impact heavy current to measure the dynamic resistance of the circuit breaker, and is very high in measuring precision; and the detection of a loop resistor and the closing resistor adopt the voltage ratio method, the closing resistor of the high-voltage circuit breaker, the loop resistor and the pre-insertion time of the closing resistor can be integrated, and the three parameter measuring results can be obtained with only one measurement operation.

Description

technical field [0001] The invention relates to the technical field of resistance detection of a high-voltage circuit breaker, in particular to a method for measuring the dynamic resistance of a high-voltage circuit breaker. Background technique [0002] In addition to transformers and generators, important primary components in high-voltage power systems also include various switchgears. High-voltage circuit breakers are the most important switching components in high-voltage power systems. Cut off the short-circuit current in the fault state, remove the faulty component from the system, and prevent the expansion of the fault. If a high voltage circuit breaker fails, the safe operation of the system is at great risk. Therefore, the performance of high-voltage circuit breakers is of great significance to the safe operation of high-voltage power systems. [0003] According to DL / T596-1996 "Preventive Test Regulations for Electric Power System", high-voltage circuit breakers...

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Problems solved by technology

[0006] Domestic instruments for measuring circuit breaker circuit resistance, closing resistance and closing resistance pre-insertion time are dazzling, but there are common problems such as single measurement fun...

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