A Method of Calculating Waveform Parameters of Transient Recovery Voltage

Abstract

The invention relates to a method for calculating a transient recovery voltage (TRV) waveform parameter. A plurality of tangent lines required in a standard are calculated through TRV waveform rotation, so that the parameter of a TRV waveform is obtained, human errors are reduced, the primitiveness of data is ensured, and the accuracy of test data analysis is increased. The method has the advantages of intuition and visualization of a graphic-art technique, and has the advantages of convenience and high efficiency simultaneously; the test efficiency is increased. The accurate TRV parameter obtained through the method can be taken as a reference for test personal to adjust a test loop parameter, so that the breaking property of a tested circuit breaker can be checked more accurately, and technical support is provided for the safe running of an electric power system.

Description

【Technical field】 [0001] The invention relates to the technical field of high-voltage circuit breaker testing, in particular to a method for transiently recovering voltage waveform parameters. 【Background technique】 [0002] When a short-circuit fault occurs in the power system, the circuit breaker opens and breaks the short-circuit current. After the contacts of the circuit breaker are separated, an arc is generated between the contacts. When the arc current crosses zero and the arc is extinguished, due to the existence of capacitance and inductance in the circuit, the arc gap voltage needs to go through a recovery process to rise to the power supply voltage. During this recovery process, The first generated voltage is the transient recovery voltage (Transient Recovery Voltage, TRV). The time of TRV is very short, only tens of microseconds to several milliseconds. A large number of research and experimental analysis show that the rate of rise and amplitude of TRV are the ...

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Problems solved by technology

At present, the methods for calculating two or four parameters of TRV include manual method and polynomial fitting method. The manual method is that technicians manually draw each tangent line of TRV on the waveform diagram to obtain the corresponding parameters, which is not only time-consuming and inefficient, but also due to subjective factors. Infiltration, the accuracy of the obtained parameters cannot be guaranteed; the polynomial fitting method is to obtain F(x)=Σa by performing polynomial fitting on the collected discrete data i x i , on the basis of F(x), solve the polynomial equations to calculate the corresponding parameters, but after verification, it is found that this method has contradictions in the selection of polynomial fitting order when fitting the TRV waveform of the four-parameter method, and the order is low The coincidence of F(x) and TRV waveforms on the whole cannot be guaranteed, and the high order will cause the "Runge" phenomenon in the F(x) and TRV waveforms locally, which will affect the accuracy of parameter calculation

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