Application - ABB RELION REX640 Technical Manual

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Supervision functions

GUID-147DACFF-C3A6-4874-A08F-6387EF323097 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.

Application

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. Example

of both mechanical (on the left) and static (on the right) outputs TCS connections are

The mechanical outputs (PODPx) are used in both AC or DC circuits,

and polarity is insignificant. The static outputs (SPOx) can be used in

DC only and polarity must be correct.

The best solution is to connect an external R

breaker internal contact as shown with the dashed line. This way, although the circuit

breaker auxiliary contact is open, TCS can see the trip circuit through R

resistor should have such a resistance that the current through the circuit breaker coil

remains small, that is, it does not harm or overload the circuit breaker's trip coil if the

trip is latched/locked-out.

shunt resistor in parallel with the circuit

1MRS759142 C

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