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873EC-JIPFGZ FOXBORO模块
873EC-JIPFGZ-FOXBORO模块
作用:主要用于当发生人身触电或漏电时，能迅速切断电源，保障人身安全，防止触电事故。有的漏电保护器还兼有过载、短路保护，用于不频繁起、停电动机。
工作原理:当正常工作时，不论三相负载是否平衡，通过零序电流互感器主电路的三相电流相量之和等于零，故其二次绕组中无感应电动势产生，漏电保护器工作于闭合状态。如果发生漏电或触电事故，三相电流之和便不再等于零，而等于某一电流值1s。ls会通过人体、大地、变压器中性点形成回路，这样零序电流互感器二次侧产生与Is对应的感应电动势，加到脱扣器上，当Is达到一定值时，脱扣器动作，推动主开关的锁扣，分断主电路。
873EC-JIPFGZ FOXBORO模块
873EC-JIPFGZ-FOXBORO module
Function: It is mainly used to quickly cut off the power supply when personal electric shock or leakage occurs, to ensure personal safety and prevent electric shock accidents. Some leakage protectors also have overload and short circuit protection, which are used for infrequent starting and power failure motors.
Working principle: When working normally, regardless of whether the three-phase load is balanced, the sum of the three-phase current phasors through the main circuit of the zero-sequence current transformer is equal to zero, so no induced electromotive force is generated in the second winding, and the leakage protector works in the closed state. If a leakage or electric shock occurs, the sum of the three phases of the current is no longer equal to zero, but equal to a certain current value 1s. ls will form a loop through the human body, the earth and the neutral point of the transformer, so that the induced electromotive force corresponding to Is will be generated on the secondary side of the zero-sequence current transformer and added to the trip device. When Is reaches a certain value, the trip device will act to push the lock of the main switch and break the main circuit.
Function: It is mainly used to quickly cut off the power supply when personal electric shock or leakage occurs, to ensure personal safety and prevent electric shock accidents. Some leakage protectors also have overload and short circuit protection, which are used for infrequent starting and power failure motors.
Working principle: When working normally, regardless of whether the three-phase load is balanced, the sum of the three-phase current phasors through the main circuit of the zero-sequence current transformer is equal to zero, so no induced electromotive force is generated in the second winding, and the leakage protector works in the closed state. If a leakage or electric shock occurs, the sum of the three phases of the current is no longer equal to zero, but equal to a certain current value 1s. ls will form a loop through the human body, the earth and the neutral point of the transformer, so that the induced electromotive force corresponding to Is will be generated on the secondary side of the zero-sequence current transformer and added to the trip device. When Is reaches a certain value, the trip device will act to push the lock of the main switch and break the main circuit.
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