FactorCBopen: The setting FactorCBopen gives a constant to be multiplied to beta if
the generator circuit breaker is open, input 52a
is not active and CBexists is set to Yes .
VN3rdHPU: The setting VN3rdHPU gives the undervoltage operation level if
TVoltType is set to NoVoltage. In all other connection alternatives this setting is not
active and operation is instead based on comparison of the differential voltage DV3
with the bias voltage BV3. The setting is given as % of the rated phase-to-ground
voltage. The setting should be based on neutral point 3
rd
harmonic voltage
measurement at normal operation.
VNFundPU: VNFundPU gives the operation level for the fundamental frequency
residual voltage stator ground fault protection. The setting is given as % of the rated
phase-to-ground voltage. A normal setting is in the range 5 – 10%.
VT3BlkLevel:VT3BlkLevel gives a voltage level for the 3rd harmonic voltage level at
the terminal side. If this level is lower than the setting the function is blocked. The
setting is given as % of the rated phase-to-ground voltage. The setting is typically 1 %.
t3rdH: t3rdH gives the trip delay of the 3
rd
harmonic stator ground fault protection.
The setting is given in seconds. Normally, a relatively long delay (about 10 s) is
acceptable as the ground fault current is small.
tVNFund: tVNFund gives the trip delay of the fundamental frequency residual voltage
stator ground fault protection. The setting is given in s. A delay in the range 0.5 – 2
seconds is acceptable.
Section 10 1MRK 502 071-UUS A
Voltage protection
470 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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