What is the function of anti pumping relay in CB?

What is the function of anti pumping relay in CB?

The function of Anti Pumping relay is to cut off the supply to CB closing coil in case of TNC switch spring failure and prevent CB hunting effect i.e. continuous closing, opening operation. Anti pumping is also called Trip Free Mechanism of any Circuit Breaker.

What is anti pumping feature?

Anti pumping is also called trip free mechanism of any circuit breaker. Meanwhile a fault has taken place and relay closes the trip circuit of breaker. The trip free mechanism/ Anti pumping feature permits the circuit breaker to be tripped by protective relay even if it is under process of closing.

What is meant by anti pumping function in closing the circuit breaker?

Definition: A feature incorporated in a Circuit Breaker or re-closing scheme to prevent repeated operation where the closing impulse lasts longer than the sum of the relay and CB operating times.

What is a 52y relay?

February 24, 2020 adminPower Engineering. Anti-Pump relay is used in medium voltage power circuit breaker closing circuit to ensure that if breaker receives simultaneous open and close commands it does not indefinitely keep closing and opening.

What is a trip free circuit breaker?

• In the most general definition of “Trip-Free,” the contacts of the circuit breaker must return to the open position and remain there when an opening operation follows a closing operation, regardless of whether the closing signal, force, or action is maintained.

What are 52a and 52b contacts?

52a a circuit breaker operating mechanism actuated switch that is closed when the main contacts are closed. 52b a circuit breaker operating mechanism actuated switch that is closed when the main contacts are open.

What is pole discrepancy in a circuit breaker?

Pole discrepancy usually refers to differences in operating times between the 3 phases or poles of a switching device within the same operation.

What is circuit breaker with diagram?

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected.

What is 52b contact?

52a means it is an AC Circuit Breaker which contact mimics the breaker (contact is closed when breaker is closed) and 52b means the contact is in the opposite position of the breaker. A MOC is a mechanism-operated cell which also mimics the position of the breaker.

Why the auxiliary relay is required along with the main relay?

Hence it is called auxiliary. Auxiliary relays are used in protection system to provide isolation of primary and back-up relaying. This is to isolate them from unnecessary signals in the form of current especially during tripping.

What are the applications of MCB?

MCB or Miniature Circuit Breaker is a circuit breaker which is used for protection where current ratings are lower. It can be used upto 125A circuits & like MCCBs it also offers protection against overload & short circuit through bimetal & solenoid.

What is the purpose of the 52a contact?

The 52a contact prevents or allows the trip coil from operating. It closes when the circuit breaker opens. The 52a contact prevents or allows the trip coil from operating. It closes when the circuit breaker closes.

What causes a breaker to trip on an anti pumping relay?

For instance, if the operator gives the closing command to the breaker by pressing the close button and the breaker closes. However, a fault in the system causes the breaker to trip. Since the close command is still in the pressed condition, there is a chance of the breaker closing again and being tripped by the relay multiple times.

Why is anti pumping relay used in a TNC switch?

It is classified as an auxiliary relay. Why Antipumping relay is used? Anti pumping relaying is done primarily to indicate the spring failure of TNC switch and a person need to attend the problem.

How to reset an anti pump circuit breaker?

To reset the anti-pump circuit, close switch has to be released and a new close command has to be provided. This is the operating sequence of Anti-Pump relay. A desirable characteristic of medium voltage circuit breaker is to have ‘Trip-Free’ operation.

Can a 86 lockout relay be used for anti pumping?

After resetting its status will be NC and a closed command will be extended to closing coil without any human interface which is a mal function. So an 86 lockout relay cannot fulfill the purpose of anti pumping relay.