Power Output Contacts - ABB RELION 620 Series Technical Manual

Protection and control

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Basic functions

The contacts used for external signalling, recording and indicating, the signal

outputs, need to adjust to smaller currents, but they can require a minimum current

(burden) to ensure a guaranteed operation.

The protection relay provides both power output and signal output contacts. To

guarantee proper operation, the type of the contacts used are chosen based on

the operating and reset time, continuous current rating, make and carry for short

time, breaking rate and minimum connected burden. A combination of series or

parallel contacts can also be used for special applications. When appropriate, a

signal output can also be used to energize an external trip relay, which in turn can

be confiugred to energize the breaker trip or close coils.

All contacts are freely programmable, except the internal fault output IRF.

Power output contacts

Power output contacts are normally used for energizing the breaker closing coil and

trip coil, external high burden lockout or trip relays.

Dual single-pole power outputs PO1 and PO2

Dual (series-connected) single-pole (normally open/form A) power output contacts

PO1 and PO2 are rated for continuous current of 8 A. The contacts are normally

used for closing circuit breakers and energizing high burden trip relays. They can be

arranged to trip the circuit breakers when the trip circuit supervision is not available

or when external trip circuit supervision relay is provided.

The power outputs are included in slot X100 of the power supply module.

Figure 36: Dual single-pole power output contacts PO1 and PO2

Using an external trip relay can require an external trip circuit supervision

relay. It can also require wiring a separate trip relay contact back to the

protection relay for breaker failure protection function.

1MRS757644 H

Technical Manual