GE Multilin G650, Manual

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9-8 G650 Generator Protection & Control System GEK-113285A
9.7 VERIFICATION OF MEASUREMENT 9 COMMISSIONING
9
9.7.3 ACTIVE, REACTIVE POWER, AND COS
ϑ
METERING
Equations to be applied for powers in a wye connection are as follows:
Apply the following current and voltage values:
With the indicated voltage and current values, verify that the power measure corresponds to expected values indicated in
the following table:
Maximum admissible error is ± 1% of the test value for P and Q, and 0.02 for cos
ϕ
.
9.7.4 FREQUENCY
Frequency measure on channel VII (terminals A7-A8):
Apply 50 Vac at 50 Hz on channel VII. Maximum admissible error:± 10 mHz.
Apply 50 Vac at 60 Hz on channel VII. Maximum admissible error: ± 12 mHz.
Frequency measure on channel Vx (terminals A11-A12):
Apply 50 Vac at 50 Hz on channel Vx. Maximum admissible error:± 10 mHz.
Apply 50 Vac at 60 Hz on channel Vx. Maximum admissible error: ± 12 mHz.
Results:
POWER PER PHASE THREE-PHASE POWER
P=V*I*Cos
ϕ
P=Pa+Pb+Pc
Q=V*I*Sen
ϕ
Q=Qa+Qb+Qc
APPLIED VOLTAGE AND CURRENT VALUES PER PHASE
PHASE A PHASE B PHASE C V-I ANGLES
VI = 50 V, 0º VII = 50 V , 120º VIII = 50V, 240º
ϕ
=45º
Ia = 10
∠
45º Ib= 10
∠
165º Ic = 10
∠
285º
Cos
ϕ
= 0.707
EXPECTED POWER VALUES
PHASE A PHASE B PHASE C THREE-PHASE
Pa = 353.55 MW Pb = 353.55 MW Pc = 353.55 MW P = 1060.66 MW
Qa = 353.55 MVAr Qb = 353.55 MVAr Qc = 353.55 MVAr Q = 1060.66 MVAr
CHANNEL VOLTAGE (V) SET FREQUENCY (HZ) MEASURED FREQUENCY (HZ)
VII 50 50 Hz
60 Hz
VX 50 50 Hz
60 Hz