GE C70 User Manual

2-20 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 2: PRODUCT DESCRIPTION
2
Polarizing: Voltage, Current, Dual, Dual-V, Dual-I
Polarizing voltage: V_0 or VX
Polarizing current: IG
Operating current: I_0
Level sensing: 3 × (|I_0| – K × |I_1|), IG
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°
Offset impedance: 0.00 to 250.00 Ω in steps of 0.01
Pickup level: 0.002 to 30.000 pu in steps of 0.01
Dropout level: 97 to 98%
Operation time: <16 ms at 3 × pickup at 60 Hz
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°
Offset impedance: 0.00 to 250.00 Ω in steps of 0.01
Pickup level: 0.015 to 30.000 pu in steps of 0.01
Dropout level: 97 to 98%
Operation time: <16 ms at 3 × pickup at 60 Hz
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 nominal in steps of 0.001
Pickup level accuracy: 0.002 pu for <1 pu current and <20 CT mismatch between phase and differential 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, whichever is greater
Operate time: <35 ms at 60 Hz
NEUTRAL CURRENT UNBALANCE
Auto-setting: on demand from keypad
Number of elements: 1 per CT bank, to a maximum of 3
Inherent unbalance factor: magnitude of 0 to 0.1500 in steps of 0.0001, angle of 0 to 359° in steps of 1
Number of trip/alarm stages: 4, with individual timers per stage
Pickup threshold: 0.001 to 5.000 pu of ground input CT in steps of 0.001
Pickup level accuracy: 0.002 pu for <1 pu current and < 20 CT mismatch between phase and neutral CT
Hysteresis: 3% or 0.001 pu, whichever is greater
Slope: 0.0 to 10.0% in steps of 0.1
Pickup delay: 0 to 600.00 s in steps of 0.01
Timer accuracy: ±3% of operate time or ±35 ms, whichever is greater
Operate time: <35 ms at 60 Hz

GE C70 Specifications

General

Brand	GE
Model	C70
Category	Protection Device
Language	English