How does the energy storage motor of the circuit breaker work

How does a circuit breaker work?

The control circuit’s logic is served by the anti-pump relay (Y), which prevents a continuous electrical close signal from causing the circuit breaker to repeatedly close after receiving a trip signal. Solenoids are used to power the breaker’s electrical operation.

What is the function of a charging motor?

The function of the charging motor (M) is to compress the main closing spring which is the mechanical stored energy mechanism. The energy required to trip or open the circuit breaker is provided by the tripping spring, while the energy required to close the circuit breaker is supplied by the closing spring.

How does a medium voltage breaker work?

While the protective relay in medium voltage applications requires control power, the typical medium voltage breaker is closed and opened via mechanical springs in the breaker and there is a manual close and trip button on the face of the breaker along with a flag indicating breaker status. The operating mechanism is a stored-energy mechanism.

How does a breaker close?

The force is transmitted from the operating mechanism to the pole assemblies via operating levers. To close the breaker, the closing spring can be unlatched either mechanically by means of the local “ON” pushbutton or electrically by remote control. The closing spring charges the opening or contact pressure springs as the breaker closes.

When a circuit breaker is energized?

The close coil (CC) is energized if the 52/b contact, LS contact, LCS contact, and Y contact are all closed. The 52/b contact automatically opens when the breaker closes, cutting off power to the close coil. Figure 3 shows the typical trip control circuit of a circuit breaker.

How does a motor cutoff switch work?

When the main closing spring has been fully charged and the stored energy mechanism is prepared for a closing operation, the motor cutoff switch (LS) creates an electrical break in the control circuit supplying the charging motor (M).