基于无量纲化处理的直接试验回路两参数TRV计算方法研究

Research on two parameter TRV calculation method of direct test circuit based on non-dimensional processing

大容量试验站的直接短路开断试验回路通常用于中压配电网断路器的短路开断能力考核,直接试验回路的预期瞬态恢复电压(Transient recovery voltage,TRV)波形具有两参数特征。针对TRV参数计算和调试的复杂性,该文通过将TRV变量u tr的解析表达式中两个有量纲量δ和ω0经过无量纲化处理,使得u tr表达式中仅有一个无量纲量d S,从而使得TRV参数计算过程得到简化。最后,应用该无量纲化处理的两参数TRV计算方法,以额定电压12 kV,额定短路开断电流31.5 kA的S1级断路器短路开断试验方式T100s为例,验证了计算方法的实用性和有效性,试验波形和试验参数均满足标准要求。

The direct short-circuit breaking test circuit of the high power test station is usually used for assessing the short-circuit breaking capacity of the circuit breaker of the medium voltage distribution network,and the prospective transient recovery voltage(TRV)waveform is composed of two parameter characteristics.In view of the complexity of TRV parameter calculation and debugging,this paper simplifies the calculation process of TRV parameters by making two dimensional variablesδandω0 to one non-dimensional variable d S in the analytical expression of variable u tr.Finally,using the non-dimension two parameter TRV calculation method,taking the short-circuit breaking test type T100s of S1 circuit breaker with rated voltage of 12 kV and rated short-circuit breaking current of 31.5 kA as an example,the practicability and effectiveness of the calculation method are verified,and the test waveform and test parameters meet the standard requirements.