GE C70

2-22 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 2: PRODUCT DESCRIPTION
2
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0 to 600.00 s in steps of 0.01
Reset delay: 0 to 600.00 s in steps of 0.01
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
Operate time: <30 ms at 1.10 × pickup at 60 Hz
NEGATIVE SEQUENCE OVERVOLTAGE
Pickup level: 0.004 to 1.250 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0 to 600.00 s in steps of 0.01
Reset delay: 0 to 600.00 s in steps of 0.01
Timer accuracy: ±3% of operate time or ±20 ms, whichever is greater
Operate time: <30 ms at 1.10 × pickup at 60 Hz
BREAKER FAILURE
Mode: 1-pole, 3-pole
Current supervision: phase, neutral current
Current supv. pickup: 0.020 to 30.000 pu in steps of 0.001
Current supv. dropout: 97 to 98% of pickup
Current supv. accuracy:
0.1 to 2.0 × CT rating: ±0.75% of reading or ±2% of rated (whichever is greater)
above 2 × CT rating: ±2.5% of reading
BREAKER ARCING CURRENT
Principle: accumulates breaker duty (I
2
t) and measures fault duration
Initiation: programmable per phase from any FlexLogic operand
Compensation for auxiliary relays: 0 to 65.535 s in steps of 0.001
Alarm threshold: 0 to 50000 kA
2
-cycle in steps of 1
Fault duration accuracy: 0.25 of a power cycle
Availability: 1 per CT bank with a minimum of 2
BREAKER FLASHOVER
Operating quantity: phase current, voltage, and voltage difference
Pickup level voltage: 0.004 to 1.500 pu in steps of 0.001
Dropout level voltage: 97 to 98% of pickup
Pickup level current: 0.020 to 1.500 pu in steps of 0.001
Dropout level current: 97 to 98% of pickup
Level accuracy: ±0.5% or ±0.1% of rated, whichever is greater
Pickup delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±42 ms, whichever is greater
Operate time: <42 ms at 1.10 × pickup at 60 Hz
BREAKER RESTRIKE
Principle: detection of high-frequency overcurrent condition ¼ cycle after breaker opens
Availability: one per digital signal processor (DSP)
Pickup level: 0.1 to 2.00 pu in steps of 0.01
Reset delay: 0.000 to 65.535 s in steps of 0.001
THERMAL OVERLOAD PROTECTION
Thermal overload curves: IEC 255-8 curve
Base current: 0.20 to 3.00 pu in steps of 0.01
Overload (k) factor: 1.00 to 1.20 pu in steps of 0.05
Trip time constant: 0 to 1000 min. in steps of 1
Reset time constant: 0 to 1000 min. in steps of 1
Minimum reset time: 0 to 1000 min. in steps of 1