GE C70 Instruction Manual page 47

2 PRODUCT DESCRIPTION
NEGATIVE SEQUENCE TOC
Pickup level: 0.000 to 30.000 pu in steps of 0.001
Dropout level: 97% to 98% of pickup
Level accuracy: ±0.5% of reading or ±0.4% of rated
(whichever is greater)
from 0.1 to 2.0 x CT rating
±1.5% of reading > 2.0 x CT rating
Curve shapes: IEEE Moderately/Very/Extremely
Inverse; IEC (and BS) A/B/C and Short
Inverse; GE IAC Inverse, Short/Very/
Extremely Inverse; I
(programmable); Definite Time (0.01 s
base curve)
Curve multiplier (Time dial): 0.00 to 600.00 in steps of 0.01
Reset type: Instantaneous/Timed (per IEEE) and Lin-
ear
Curve timing accuracy
at 1.03 to 20 x pickup: ±3.5% of operate time or ±½ cycle
(whichever is greater) from pickup to
operate
NEGATIVE SEQUENCE IOC
Pickup level: 0.000 to 30.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
0.1 to 2.0  CT rating: ±0.5% of reading
Level accuracy:
or ±0.4% of rated (whichever is greater);
2.0  CT rating: ±1.5% of reading
2%
Overreach:
Pickup delay: 0.00 to 600.00 s in steps of 0.01
Reset delay: 0.00 to 600.00 s in steps of 0.01
<20 ms at 3  pickup at 60 Hz
Operate time:
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
PHASE DIRECTIONAL OVERCURRENT
°
Relay connection: 90 (quadrature)
Quadrature voltage: ABC phase seq.: phase A (V
B (V ), phase C (V
CA
seq.: phase A (V
phase C (V
Polarizing voltage threshold: 0.000 to 3.000 pu in steps of 0.001
Current sensitivity threshold: 0.05 pu
Characteristic angle: 0 to 359
Angle accuracy: ±2°
Operation time (FlexLogic operands):
Tripping (reverse load, forward fault):
12 ms, typically
Blocking (forward load, reverse fault):
8 ms, typically
GE Multilin
2
t; FlexCurves™
), phase
BC
); ACB phase
AB
), phase B (V ),
CB AC
)
BA
°
in steps of 1
C70 Capacitor Bank Protection and Control System
NEUTRAL DIRECTIONAL OVERCURRENT
Directionality: Co-existing forward and reverse
Polarizing: Voltage, Current, Dual, Dual-V, Dual-I
Polarizing voltage: V_0 or VX
Polarizing current: IG
Operating current: I_0
3  (|I_0| – K  |I_1|), IG
Level sensing:
Independent for forward and reverse
Restraint, K: 0.000 to 0.500 in steps of 0.001
Characteristic angle: –90 to 90° in steps of 1
Limit angle: 40 to 90° in steps of 1, independent for
forward and reverse
Angle accuracy: ±2°
0.00 to 250.00  in steps of 0.01
Offset impedance:
Pickup level: 0.002 to 30.000 pu in steps of 0.01
Dropout level: 97 to 98%
<16 ms at 3  pickup at 60 Hz
Operation time:
NEGATIVE SEQUENCE DIRECTIONAL OC
Directionality: Co-existing forward and reverse
Polarizing: Voltage
Polarizing voltage: V_2
Operating current: I_2
Level sensing:
Zero-sequence:|I_0| – K  |I_1|
Negative-sequence:|I_2| – K  |I_1|
Restraint, K: 0.000 to 0.500 in steps of 0.001
Characteristic angle: 0 to 90° in steps of 1
Limit angle: 40 to 90° in steps of 1, independent for
forward and reverse
Angle accuracy: ±2°
0.00 to 250.00  in steps of 0.01
Offset impedance:
Pickup level: 0.015 to 30.000 pu in steps of 0.01
Dropout level: 97 to 98%
<16 ms at 3  pickup at 60 Hz
Operation time:
PHASE CURRENT UNBALANCE
Operation: per phase
Auto-setting: on demand from keypad, per phase
Number of elements: 1 per CT bank, maximum of 3
Inherent unbalance factor:–0.1000 to 0.1000 in steps of 0.0001,
per phase
Number of trip/alarm stages: 4 per phase with individual timers per
stage
Pickup threshold: 0.001 to 5.000 pu of split-phase CT nom-
inal in steps of 0.001
Pickup level accuracy: 0.002 pu for <1 pu current and <20 CT
mismatch between phase and differen-
tial CT
Hysteresis: 3% or 0.001 pu, whichever is greater
Pickup delay: 0 to 600.00 s in steps of 0.01
Timer accuracy: ±3% of operate time or ±35 ms, which-
ever is greater
Operate time: <35 ms at 60 Hz
2.2 SPECIFICATIONS
2
2-15