CHAPTER 1: INTRODUCTION SPECIFICATIONS
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–11
RESTRICTED GROUND FAULT
Number of Elements: ........................................ 2
Pickup Level:.......................................................... 0.02 to 20.00 xCT in steps of 0.01
0.002 to 2.000 xCT (with sensitive CTs)
GND Supervision Level:.................................... 0.02 to 20.00 xCT in steps of 0.01
0.002 to 2.000 xCT (with sensitive CTs)
Dropout Level: ...................................................... 97% of Pickup
Slope Range: ......................................................... 0 to 100% in steps of 1
Pickup Delay: ........................................................ 0.00 to 600.0 s in steps of 0.01
Operate Time:....................................................... < 30 ms @ 0 ms time delay
Level Accuracy:.................................................... per current inputs
Metering
PHASE & GROUND CURRENT INPUTS
CT Primary: ............................................................1 to 6000 A
Range: ......................................................................0.02 to 20 × CT
Input type:..............................................................1 A or 5 A (must be specified with order P1G1 or P5G5)
Configurable 1 A or 5 A (must be specified with order P0G0)
Nominal frequency:...........................................50/60 Hz
Burden: ....................................................................<0.1 VA at rated load
Accuracy at nominal frequency:.................3%
±10 mA or ±20% of reading from 0.02 to 0.19 × CT, whichever
is greater
CT withstand: ........................................................1 second at 100 A (1 A option)
1 second at 400 A (5 A or universal CT option)
2 seconds at 40 × rated current
continuous at 3 × rated current
SENSITIVE GROUND CURRENT INPUT
CT Primary: ............................................................1 to 600 A
Range: ......................................................................0.002 to 3 × CT
Input type:..............................................................1 A or 5 A (must be specified with order P1S1 or P5S5)
Configurable 1 A or 5 A (must be specified with order P0S0)
Nominal frequency:...........................................50/60 Hz
Burden: ....................................................................<0.1 VA at rated load
Accuracy at nominal frequency:.................3%
±10 mA or ±20% of reading from 0.02 to 0.19 × CT, whichever
is greater
CT withstand: ........................................................1 second at 100 A (1 A option)
1 second at 400 A (5 A or universal CT option)
2 seconds at 40 × rated current
continuous at 3 × rated current
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