Power capacitor protector application skills

March 28, 2019

The power capacitor protector is a power capacitor control system that can be combined with switching capacitor contactors, reactive compensation controllers, fuses, etc. It is mainly used as overcurrent, short circuit, inrush current, harmonic wave, overvoltage in the power capacitor and compensation compensation circuit. Faults such as protection, power capacitor protector as a new product of over-current protection to fill the gap of domestic power capacitor protector, can be widely used in power factor automatic compensation control circuit.

Power capacitor protector Application of power capacitor protector Precautions 1. The protector operating power should be consistent with the nominal voltage.

2. The wiring of the protector terminal should be correct and the contact is good.

3, should be checked regularly to ensure reliable operation.

4. After the action of the protector is indicated, the type of the fault must be carefully observed, the cause of the fault must be carefully checked, and the fault can be re-executed only after the fault is correctly handled.

5. When the capacitor is put into operation, the running indicator light is in a flashing state. If the overcurrent trip occurs in a very short time, use a clamp ammeter to measure the capacitor current running time, if the current value exceeds 1.35 times the rated current. Explain the normal over-current action within the protection range. Otherwise, it may be caused by excessive harmonic content in the power grid.

6. Basic judgment on capacitor running current status: When the capacitor is normally put into operation, the operation indicator light has a certain frequency flicker. If the flicker frequency is very low or there is no flicker, it means that the capacitor running current is very small, or there may be no current. This situation may be that the contactor in the control circuit has not been put into operation or the capacity of the capacitor itself has been reduced.

7. The self-lock light is on after the protector moves to self-locking or fault alarm. It indicates that there is a large current fault in the capacitor circuit. It is necessary to carefully check the cause. After the fault is rectified, it can be reset and started, so as to avoid repeated expansion of the fault.

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