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A Technique for Determining the Parameters of a Test Loop for Automated Tests of Electric Apparatuses

机译：一种用于电气设备自动测试的测试回路参数确定技术

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摘要

According to the standards of the International Electrotechnical Commission (IEC) and Russian national standards, test loop parameters (time constant or power factor) for testing electrical apparatuses in the three-phase short-circuit (SC) mode are determined by the graphic-analytical technique. This technique is not suitable for automated tests. In addition, the precision of measuring the loop parameters is largely determined by the instant of SC occurrence. The procedures proposed in this article to determine the test loop parameters do not possess the flaws typical of the graphic-analytical technique. These drawbacks restrict one to the algorithm of SC current analysis in the initial period, or the so-called "5 function" (the curve of the sum of the squared instant values of three-phase system currents), or the curve of the total instant power in the test circuit. A common feature of the indicated functions is autonomous behavior in the transient mode, as well as the instant of SC occurrence and informativity for determining the loop parameters. The proposed procedures make it possible to find, by mathematical processing of discrete current values, the power factor and the current value of the symmetrical test current component only 16 ms after the beginning of the transient process. The new procedures can be easily used in automated tests and will make possible more precise calculations of the test loop parameters.
机译：根据国际电工委员会（IEC）的标准和俄罗斯国家标准，通过图形分析确定用于在三相短路（SC）模式下测试电气设备的测试回路参数（时间常数或功率因数）技术。此技术不适用于自动测试。此外，测量回路参数的精度很大程度上取决于发生SC的瞬间。本文提出的确定测试回路参数的程序不具有图形分析技术的典型缺陷。这些缺点限制了最初阶段的SC电流分析算法或所谓的“ 5函数”（三相系统电流的瞬时值平方和的曲线）或总和的曲线。测试电路中的瞬时功率。所指示功能的共同特征是瞬态模式下的自主行为，以及出现SC的瞬间和确定回路参数的信息性。所提出的过程使得可以通过对离散电流值进行数学处理来找到瞬态过程开始后仅16 ms的功率因数和对称测试电流分量的电流值。新的过程可以轻松地用于自动化测试中，并将使测试回路参数的计算更加精确。

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