ABB RELION REX640 Technical Manual page 1177

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1MRS759142 C

Technical Manual

This logic uses the start signal of the reverse-looking zone (Z3) connected to the IRV

input, which is used to recognize the fault in the reverse direction, that is, in the parallel

feeder. When the reverse zone is activated after a start delay (the Reversal time

setting), the logic is ready to issue an OPR_IRV output signal. The OPR_IRV signal

is connected to the BLK_CS_OPR input of DSOCPSCH in order to block the sending

of the carrier send signal (CS) and the activation of the OPERATE output of the

communication logic. The OPR_IRV signal has a drop-off delay defined with the

Reversal reset time setting.

An internal 10 ms drop-off timer enables the current reversal logic to

be activated for the short-duration input signals even if the Reversal

reset time setting is set to zero.

The BLK_IRV input is used to block the activation of the OPR_IRV output. The

BLK_IRV input is typically connected to the forward-looking zone start signals

within the terminal. General blocking is achieved by activating the BLOCK input.

Weak-end infeed logic

Weak-end infeed logic is used to activate the distance protection function when the

fault current infeed is too low due to, for example, high source impedance or fault

current distribution between sources. When activated, the CR signal is logically

combined with the local criteria to initiate the tripping of the weak-end breaker. The

received signal is echoed back to accelerate the tripping in the opposite end with the

stronger source.

GUID-5874AF6F-D7B5-405F-BA24-6260B1F2003A V1 EN

Functional module diagram of weak-end infeed logic

The WEI logic is enabled using the Wei mode setting.

If Wei mode= "Off", the WEI logic is disabled.

If Wei mode= "Echo", the WEI logic is enabled without Level detector.

If Wei mode= "Echo and Operate", the WEI logic is enabled with Level detector.

Protection related functions

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