What does an anti pump relay do?
The function of anti pumping relay is to cut off the supply to closing coil in case of TNC switch spring failure and prevent CB hunting effect (i.e. continuous closing, opening operation) and a person needs to attend the problem.
What is 52X relay?
▪ 52X relay provides Seal-In for closing.
How does a trip circuit supervision relay work?
Trip Circuit Supervision Circuit senses any fault either in the trip coil of breaker or trip circuit. On sensing a fault, Trip Circuit Supervision Relay changes its contact status to window annunciation on the panel. Here fault in the circuit means any break or open circuit.
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.
How do you test an anti pump breaker?
Connect the breaker to the circuit breaker test station. Turn on the control power. The breaker closing mechanism should charge when control power is applied. Press the electrical close button on the test station and maintain the pressure to hold it continuously closed.
What is a lockout relay?
Lockout relays are used by many utilities in electrical power transmission substations to trip and hold out of service a protection zone on the occurrence of a relay operation that requires inspection and/or repair before the zone may be safely placed back in service.
What is a 49 relay?
49 Machine or transformer thermal relay A relay that functions when the temperature of a machine armature winding or other load-carrying winding or element of a machine or power transformer exceeds a predetermined value.
What is master trip relay?
The master trip relay can operate as a hub of multiple protection relays trip commands and drive multiple subsequent contacts. This makes the relay a protagonist to execute simultaneous commands like breaker trips, interlocks, alarms, data display, SCADA extensions, and lockouts.
What is lockout relay?
What is the purpose of 52b contact?
The 52b contact allows or prevents the trip coil from operating. It closes when the Y coil is opened. The 52b contact allows or prevents the trip coil from operating. It closes when the Y coil is closed.
What does 86 mean on a relay?
The purpose of an 86 relay is to serve as an intermediary element between one or more protective relays and one or more control devices, both expanding the number of control elements actuated by any one protective function and also providing a “latching” function which must be intentionally reset in order to resume …
What is a 63 relay?
63 Pressure switch A switch that operates on given values, or on a given rate of change of pressure. 64 Ground detector relay A relay that operates upon failure of machine or other apparatus insulation to ground.
What is a 51 relay?
50/51 and 50/51N relays. Overcurrent relays are the most commonly-used protective relay type. Time-overcurrent relays are available with various timing characteristics to coordinate with other protective devices and to protect specific equipment.