ABB RELION REX640 Technical Manual page 967

Protection and control

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1MRS759142 F

blocked when the ratio between residual current of the parallel line and protected

lines exceeds the

Figure 539: Operation principle of parallel line compensation functionality

The operation time delay is defined with the

The timer can be disabled with the

blocks the OPERATE_Zx (x = 1...5) output of the phase-to-earth measuring elements.

Phase-to-phase impedance measuring elements

The phase-to-phase distance protection is suitable as a basic protection function

against two-phase short circuit faults in various networks, regardless of the

treatment of the neutral point. The short circuit fault protection is enabled with

The reach of the phase-to-phase measuring elements is based on the loop

Technical Manual

Fact EF current Bal configuration setting.

The parallel line compensation functionality is only used with single

phase-to-earth faults. Parallel line compensation is not used if multiple

phases are included into fault (more than one single earth fault releases).

Parallel lines are mutually coupled

Op Mod PP loops Znx (x = 1...5) = "True" setting.

Gnd operate Dl Znx (x = 1...5) setting.

Gnd Op Dl mode Znx = "False" setting. This

Protection functions

(Equation 268)