ABB RELION REX640 Technical Manual page 1303

Protection and control

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1MRS759142 F

Figure 738: 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

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.

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

connections are shown.

The best solution is to connect an external R

circuit 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

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.

Technical Manual

shows an application of the trip circuit supervision function use.

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.

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

shunt resistor in parallel with the

Supervision functions

Operate delay time has elapsed.