Attention in Application of Power Capacitor Protector(2)

When the capacitor is put into operation, the operating indicator lamp is in flicker state. If overcurrent tripping occurs in a very short time, the clamp ammeter is used to measure the running current of the capacitor in time. If the current value exceeds 1.35 times the rated current. It indicates that the normal overcurrent action is within the protecting range. Otherwise, it may be caused by excessive harmonic content in the power network.

The basic judgment of the current state of capacitor operation: when the capacitor is put into normal operation, the operating indicator lamp will flicker at a certain frequency , if the scintillation frequency is very low or does not flicker, it shows that the capacitor running current is very low. Or maybe there’s no current. This may be the case where the contactor is not operational in the control circuit or the capacitance of the capacitor itself is reduced.

After self-locking or failure warning of protector , the self-locking lamp is on showing that there is a large fault of current in the capacitor circuit, so it is necessary to figure out the reasons carefully and wait for the fault to be removed before it can be reset and started, so as to avoid the repeated expansion of the fault.