Alstom SHPM 101 - On Load Check Exporting Power with a Lagging Power Faction

SERVICE MANUAL R5888B
QUADRAMHO Chapter 5
Appendix A
Page 16 of 18
Figure 11a: On load check exporting power with a lagging power faction
Lead
Lag
RCA
V
A
Operation
Measured at relay with
phase angle meter
I
A
V
C
V
B
θ
PH
θ
I
NOTE:
On load checks only involve
operation of phase -phase
compararors for simplicity these
diagrams are drawn on a single
phase basic
Power system information
MW
= θ
2
Load angle = Tan
–1
MVAR
θ
1
must show reasonable agreement with θ
2