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...

AI Technical Summary

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 function, low measurement accuracy, complicated operation process of the instrument, and excessive weight of the instrument. very expensive problem

These problems will greatly reduce the labor efficiency of power grid staff

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