GE C70 Instruction Manual page 29

CHAPTER 2: PRODUCT DESCRIPTION
Blocking (forward load, reverse fault): <8 ms, typically
NEUTRAL DIRECTIONAL OVERCURRENT
Directionality:
Polarizing:
Polarizing voltage:
Polarizing current:
Operating current:
Level sensing:
Restraint, K:
Characteristic angle:
Limit angle:
Angle accuracy:
Offset impedance:
Pickup level:
Dropout level:
Operation time:
NEGATIVE SEQUENCE DIRECTIONAL OC
Directionality:
Polarizing:
Polarizing voltage:
Operating current:
Level sensing:
Zero-sequence:
Negative-sequence:
Restraint, K:
Characteristic angle:
Limit angle:
Angle accuracy:
Offset impedance:
Pickup level:
Dropout level:
Operation time:
PHASE CURRENT UNBALANCE
Operation:
Auto-setting:
Number of elements:
Inherent unbalance factor:
Number of trip/alarm stages:
Pickup threshold:
Pickup level accuracy:
Hysteresis:
Pickup delay:
Timer accuracy:
Operate time:
NEUTRAL CURRENT UNBALANCE
Auto-setting:
Number of elements:
Inherent unbalance factor:
Number of trip/alarm stages:
Pickup threshold:
Pickup level accuracy:
Hysteresis:
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
Co-existing forward and reverse
Voltage, Current, Dual, Dual-V, Dual-I
V_0 or VX
IG
I_0
3 × (|I_0| – K × |I_1|), IG
Independent for forward and reverse
0.000 to 0.500 in steps of 0.001
–90 to 90° in steps of 1
40 to 90° in steps of 1, independent for forward and reverse
±2°
0.00 to 250.00 Ω in steps of 0.01
0.002 to 30.000 pu in steps of 0.01
97 to 98%
<16 ms at 3 × pickup at 60 Hz
Co-existing forward and reverse
Voltage
V_2
I_2
|I_0| – K × |I_1|
|I_2| – K × |I_1|
0.000 to 0.500 in steps of 0.001
0 to 90° in steps of 1
40 to 90° in steps of 1, independent for forward and reverse
±2°
0.00 to 250.00 Ω in steps of 0.01
0.015 to 30.000 pu in steps of 0.01
97 to 98%
<16 ms at 3 × pickup at 60 Hz
per phase
on demand from keypad, per phase
1 per CT bank, maximum of 3
–0.1000 to 0.1000 in steps of 0.0001, per phase
4 per phase with individual timers per stage
0.001 to 5.000 pu of split-phase CT nominal in steps of 0.001
0.002 pu for <1 pu current and <20 CT mismatch between phase and differential CT
3% or 0.001 pu, whichever is greater
0 to 600.00 s in steps of 0.01
±3% of operate time or ±35 ms, whichever is greater
<35 ms at 60 Hz
on demand from keypad
1 per CT bank, to a maximum of 3
magnitude of 0 to 0.1500 in steps of 0.0001, angle of 0 to 359° in steps of 1
4, with individual timers per stage
0.001 to 5.000 pu of ground input CT in steps of 0.001
0.002 pu for <1 pu current and < 20 CT mismatch between phase and neutral CT
3% or 0.001 pu, whichever is greater
SPECIFICATIONS
2
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