Voltage sag and short interruption lead to the tripping of sensitive equipment and cause the economic loss of the industry users. A programmable logic controller (PLC) is essential equipment used in the industrial process. However, there is no detailed understanding of the sensitivity of PLC under voltage sag and short interruption. The response characteristic of PLC under voltage sag is studied. This study proposes a new testing method, called the dichotomy test method (DTM) to do the test. This study builds the testing platform and tests the sensitivity of six PLCs from five famous PLC manufacturers. The testing considers the characteristics of voltage sag, including magnitude, duration, point-on-wave, phase-angle-jump, different supply voltage, slow recovery voltage sag, multiple voltage sags and so on. The tests prove that DTM has the advantage of accuracy, robustness and workload, compared with the traditional test method. The quantitative and qualitative response characteristics of PLC under voltage sag are obtained.

中文翻译：

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可编程逻辑控制器对电压骤降和短时中断敏感性的实用测试方法

电压骤降​​和短暂中断会导致敏感设备跳闸，并给行业用户造成经济损失。可编程逻辑控制器（PLC）是工业过程中必不可少的设备。但是，对电压骤降和短时中断下PLC的灵敏度没有详细了解。研究了PLC在电压骤降下的响应特性。这项研究提出了一种新的测试方法，称为二分法测试方法（DTM）来进行测试。本研究构建了测试平台，并测试了来自五家著名PLC制造商的六台PLC的灵敏度。该测试考虑了电压骤降的特性，包括幅度，持续时间，波上点，相角跳跃，不同的电源电压，缓慢恢复的电压骤降，多个电压骤降等。测试证明，与传统测试方法相比，DTM具有准确性，鲁棒性和工作量优势。获得了电压骤降下PLC的定量和定性响应特性。