Emerson JYM-II Detector

Part name: Emerson JYM-II Detector

Operation Principle of JYM-II (JYM-IIA ,JYM-I)

The operation principle of the IMS JYM-II is shown in the following diagram.

The work of an IMS comprises two parts: routine monitoring and branch polling. In routine monitoring, when the system is in normal operation, the detector real-time observes the to-ground voltage of the positive and negative buses and calculates the bus insulation resistance. Upon bus insulation deterioration, it will raise alarms, turn on the fault indicator, report the fault signal to the PCU, and send low-frequency signals to the branches. If the branch has grounding resistance, the local mutual inductor will induce a current signal, which will, after amplification, enter AD sampling circuit, where the grounding impedance of the branch can be figured out. Consequently, the grounding resistance can be figured out by separating the resistive current from capacitive current.

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