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当防爆电器测试台检测电流时,由于三相负载不同,常表现为三相电流不平衡,严重影响测试结果。为此,设计了基于PLC控制的防爆电器测试台稳流系统。该系统以PLC智能处理器为核心,利用积分分离PID控制斩控式调压电路,并采取各相分别独立调节电压措施,实现三相同步电流调节。试验结果表明,该系统具有电路结构简单、稳流精度高和自动化水平高等优点。
When the explosion-proof electrical test bed test current, due to the three-phase load is different, often manifested as three-phase current imbalance, seriously affecting the test results. To this end, designed based on PLC-controlled explosion-proof electrical test-bed steady flow system. The system uses PLC intelligent processor as the core, uses the integral separation PID control chopping voltage regulator circuit, and take each phase separately adjust the voltage measures to achieve three-phase synchronous current regulation. The experimental results show that the system has the advantages of simple circuit structure, steady current accuracy and high level of automation.