Woodward HighPROtec MCDLV4, Manual

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Protective Elements
A minimum current supervision (I1) in the positive phase sequence system prevents a hyperfunction of the reactive-
power supervision at lower power levels.
For the power angle supervision, the minimum current supervision is always active. For the pure reactive-power
supervision the minimum current supervision is optional.
When using the power angle supervision (method 1):
Set the power angle »
Phi-Power« (Default setting 3°).
Select a suitable minimum current » I min QV« (Default setting 0.1 In) which prevents false tripping.
When using the pure reactive power supervision (method 2):
Set the reactive-power threshold
»Q min QV«(Default setting 0.05 Sn).
Optionally select a suitable minimum current »
I min QV« (Default setting 0.1 In) to prevent false tripping.
Two timer elements are available »
t1-QV« and »t2-QV«. Both timer elements will be started at pick-up of the
Q->U< module.
First timer element (Decoupling of the power generation unit)
When several mains parallel power generation units feed one PCC, the first timer element can give a trip
command to the generator circuit breaker of the power generation unit (Default setting 0.5 s)
Second timer element (Decoupling at the PCC)
For the case, that tripping of the first timer element (decoupling of a certain power generation unit) does not
have the expected effect the second timer element can give a trip command to the circuit breaker at the PCC
(Default setting 1.5 s). This decouples the entire DER from the grid.
908 MCDLV4 DOK-HB-MCDLV4-2E