Method of connecting discharge resistors in series with low voltage capacitor banks

    The discharge resistor of the low-voltage capacitor bank generally uses a 220-volt incandescent bulb, which also serves as an operating indicator light.

    In order to extend the service life of the bulb and reduce power consumption, two bulbs of the same power can be connected in series and connected in a star shape. At this time, the voltage on each bulb is about 50% of the rated voltage and the power consumed is about 35% of the rated power.

    Here is how to wire it:

    In order to ensure reliable automatic discharge during power outage, the discharge resistor should be directly connected to the capacitor bank, and a circuit breaker or fuse should not be installed separately for the discharge resistor.

    In some cases, in order to reduce the power loss in the operation of the discharge resistor, an automatic device can also be used. When the capacitor bank grid is disconnected, the automatic device automatically puts the discharge resistor into the circuit.