Woodward HighPROtec MCDLV4, Manual

Page: 1001 / 1275

Protective Elements
Pr
Testing the threshold values
(Example, Threshold 0.2 Pn)
Feed rated voltage and rated current with 180 degree phase shift between
voltage and current pointers to the measuring inputs of the relay.
The measured values for the active power „P“ must show a negative algebraic
sign.
Set the tripping threshold (e. g. 0.2 Pn).
In order to test the tripping thresholds feed 0.1 times rated current to the
measuring inputs of the relay. Increase the current slowly until the relay picks
up. Ensure that the angle between current and voltage remains constant.
Compare the tripping value to the parameterized.
Testing the tripping delay (Example, Threshold 0.2 Pn)
Feed rated voltage and rated current with 180 degree phase shift between
voltage and current pointers to the measuring inputs of the relay.
The measured values for the active power „P“ must show a negative algebraic
sign.
Set the tripping threshold (e.g. 0.2 Pn).
In order to test the tripping delay feed 0.1 times rated current to the measuring
inputs of the relay. Increase the current with an abrupt change to 0.3 In.
Ensure that the angle between current and voltage remains constant. Measure
the tripping delay at the output of the relay.
Successful test result
The measured total tripping delays or individual tripping delays, threshold values
and fallback ratios correspond with those values, specified in the adjustment list.
Permissible deviations/tolerances can be found under Technical Data.
1001 MCDLV4 DOK-HB-MCDLV4-2E