ABB RELION 620 Series Technical Manual page 874

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Supervision functions

A070785 V2 EN

Functional module diagram

This module receives the trip circuit status from the hardware. A detected failure in the

trip circuit activates the timer.

Once activated, the timer runs until the set value of Operate delay time has elapsed.

The time characteristic is according to DT. When the operation timer has reached the

maximum time value, the ALARM output is activated. If a drop-off situation occurs

during the operate time up counting, the fixed 0.5 s reset timer is activated. After that

time, the operation timer is reset.

The BLOCK input can be controlled with a binary input, a horizontal communication

input or an internal signal of the relay program. The activation of the BLOCK input

prevents the ALARM output to be activated.

TCSSCBR detects faults in the electrical control circuit of the circuit breaker. The

function can supervise both open and closed coil circuits. This supervision is

necessary to find out the vitality of the control circuits continuously.

shows an application of the trip circuit supervision function use. The best

solution is to connect an external R

internal contact. Although the circuit breaker internal contact is open, TCS can see the

trip circuit through R

through the resistance remains small, that is, it does not harm or overload the circuit

breaker's trip coil.

shunt resistor in parallel with the circuit breaker

resistor should have such a resistance that the current

1MRS757644 F

Technical Manual

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