Active, Reactive Power, And Cosj Metering - GE F650 User Manual

CHAPTER 6: COMMISSIONING
Percent of Load-to-Trip
The relevant actual values displays are shown below:
Actual > Metering > Primary Values > Current > % of Load-to-trip
Note Percent of load-to-trip is calculated from the phase with the highest current reading. It is the ratio of this current to
the lowest pickup setting among the phase time and instantaneous overcurrent protection features. If all of these features
are disabled, the value displayed is "0".
- Inject current of various values into Phase A.
- Verify that percent load-to-trip is calculated as the correct
percentage of the most sensitive operational Phase Overcurrent
element and displayed.
- Repeat for phases B and C.

6.8.3 Active, reactive power, and COSJ metering

Equations to be applied for powers in a wye connection are as follows:
Apply the following current and voltage values:
APPLIED VOLTAGE AND CURRENT VALUES PER PHASE
Phase a
VI = 50 V, 0º
Ia = 10∠45º
With the indicated voltage and current values, verify that the power measure corresponds to expected values indicated in
the following table:
EXPECTED POWER VALUES
Phase a
Pa = 353.55 MW
Qa = 353.55 MVAr
Maximum admissible error is ± 1% of the test value for P and Q, and 0.02 for cosj.
GEK-113000-AF
Power per phase
P=V*I*Cosϕ
Q=V*I*Senϕ
Phase b
VII = 50 V , 120º
Ib= 10∠165º
Phase b
Pb = 353.55 MW
Qb = 353.55 MVAr
F650 DIGITAL BAY CONTROLLER
Three-phase power
P=Pa+Pb+Pc
Q=Qa+Qb+Qc
Phase c V-I Angles
VIII = 50V, 240º ϕ=45º
Ic = 10∠285º Cosϕ= 0.707
Phase c Three-phase
Pc = 353.55 MW P = 1060.66 MW
Qc = 353.55 MVAr Q = 1060.66 MVAr
6.8 VERIFICATION OF MEASUREMENT
6-7