GE 850 - Page 388

6–120 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
ADMITTANCE CHAPTER 6: PROTECTION SETPOINTS
ANGLE CORRECTION
Range: 0.0 to 359.0° in steps of 0.1°
Default: 0.0°
This setting specifies the correction angle between current and voltage.
In addition, this setting can be used to correct the relative polarity of the ground current
with respect to voltage. If the polarity of the current is reversed or not relative to voltage,
this setting can be used to change the polarity. When “180 deg” is selected, the
measured admittance Y0 is multiplied with -1 which corresponds to a 180 degree shift in
current direction.
Secondly, this angle can also be used to eliminate the angular errors of the voltage
transformer and/or current transformers (CT); measured phase angle deviations caused
by measuring inaccuracy of voltage transformers, can be eliminated by properly setting
this value.
jB
G
)(
00
0
0
0
VI
V
I
Y 
)( 180
00
0
0
0
 VI
V
I
Y
jB
G
Y0
Y0"
Y0'
Y0-ƀc
Y0+ƀc