摘要
瞬态恢复电压(TRV)是电力网络中存在的固有特性之一,是影响断路器开断性能的重要因素,因此在IEC、GB以及DL的相关标准中都对此做出了明确的规定。为了获得满足标准要求的试验回路预期参数,需要采用低压模拟的方法来测取TRV波形,因此参照相关标准中推荐的直接短路开断法、工频电流注入法、电容电流注入法等几种方法,经过分析比较,选定基于“电容电流注入法”的原理研制出了一套操作简便的低压模拟装置,使用该装置可快速实施对试验回路预期TRV波形的测取。装置研制成功后已投入课题的调试工作,进行了数百次低压模拟试验,取得了很好的预期效果。
As one of inherent characteristics in power system, TRV is an important factor affecting switching course of test circuit breaker, it has been clearly defined in IEC, GB, DL. In order to obtain prospective parameters of the test circuit which meet the standards, it is necessary to utilize simulation method to acquire prospective TRV waveform. Comparing and analyzing several methods recommended in standards is carried out, for examples, direct short-circuit breaking, power-frequency current injection, capacitive current injection, methods of calibration, model networks, calculation from circuit parameters and no load switching of test circuit including transformers. Irrespective of the method used, the actual values measured in the test plant for the prospective TRV shall be in accordance with the values specified in the standards. For some circuit-breakers the characteristics for short-line faults are also specified, and during short-line fault tests the corresponding resulting TRV has been specified. Local capacitance between the circuit-breaker and the line will also produce a time delay in the line side TRV component. During testing, it is desirable to measure and record the line side time delay and the method used should be suitable for evaluating this. Finally, method of capacitive current injection is selected on account of its convenience and accuracy, authors of this paper devises a set of low-voltage simulation apparatus which can be easily operated. By using the apparatus, waveform of prospective transient recovery voltage in test circuit can be quickly and accurately measured. The apparatus has been applied to some tasks after being successfully developed, and hundreds of low-voltage simulation tests have been conducted and expected results have been obtained.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第8期33-35,共3页
High Voltage Engineering
关键词
开断试验
预期瞬态恢复电压
低压模拟
断路器
电容电流注入法
switching test
prospective transient recovery voltage
low-voltage simulation
circuit breaker
method of capacitive current injection
