GE Multilin G650, Manual

Page: 38 / 639

GEK-113285A G650 Generator Protection & Control System 2-9
2 PRODUCT DESCRIPTION 2.4 TECHNICAL SPECIFICATIONS
2
2.4.1.4 SENSITIVE GROUND TIME OVERCURRENT (51SG)
2.4.1.5 PHASE AND GROUND INSTANTANEOUS OVERCURRENT (50PH50G)
Current Input Phasor (without harmonics) or RMS
Rated current For connection to 1 or 5 A CTs.
Pickup level 0.005 to 16.000 A in steps of 0.001 A
Dropout level 97% to 98% of the pickup level
Level Accuracy
Values at nominal frequency:
±
1.5% of the reading
±
1 mA from 0.005 to 16 A
Curve Shapes IEEE extremely / very / moderately inverse
IEC A/B/C/long-time inverse/short time inverse curve
IAC extremely / very / moderately inverse
ANSI extremely / very / normally / moderately inverse
I
2
t
Definite time
Rectifier curve
FlexCurve
™
A/B/C/D user curve
Curve Multiplier (Time Dial) 0.00 to 900.00 s in steps of 0.01 s
Reset type Instantaneous or time delayed according to IEEE
Timing accuracy Operate at > 1.03 times the pickup ±3% of operate time
or 50 ms. (whichever is greater)
Saturation Level 48 times the pickup level
Snapshot Events Selectable by setting
Current Input Phasor (without harmonics) or RMS
Rated current For connection to 1 or 5 A CTs.
Pickup level 0.05 to 160.00 A in steps of 0.01 A
Dropout level 97% to 98% of the pickup level
Level Accuracy
Values at nominal frequency:
±
0.5% of the reading
±
10 mA from 0.05 to 10 A
±
1.5% of the reading for higher values
Overreach < 2%
Trip delay 0.00 to 900.00 s. in steps of 0.01 s.
Reset delay 0.00 to 900.00 s. in steps of 0.01 s.
Operate time <50 ms at 3 x Pickup at 50 Hz, typically
Timing accuracy at 0 ms time delay (no intentional delay): 50ms
at non-zero time delay:
±
3% of operate time or 50 ms
(whichever is greater)
Snapshot Events Selectable by setting