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345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS
CHAPTER 1: INTRODUCTION
Specifications
NOTE
NOTE:
Specifications are subject to change without notice.
Password security
PASSWORD SECURITY
Master Reset Password:..................................8 to 10 alpha-numeric characters
Settings Password:.............................................3 to 10 alpha-numeric characters for local and remote
access
Control Password: ..............................................3 to 10 alpha-numeric characters for local and remote
access
Protection
PHASE/NEUTRAL/GROUND/NEGATIVE SEQUENCE TIMED OVERCURRENT (51P/51N/51G/
51_2)
Ground Current:...................................................Fundamental
Pickup Level: .........................................................0.04 to 20.00 x CT in steps of 0.01 x CT
Dropout Level:......................................................97 to 99% of Pickup @ I > 1 x CT
Pickup - 0.02 x CT @ I < 1 x CT
Curve Shape:.........................................................ANSI Extremely/Very/Moderately/Normally Inverse
Definite Time
IEC Curve A/B/C/Short
IAC Extremely/Very/Inverse/Short
Curve Multiplier: ..................................................0.05 to 20.00 in steps of 0.01
Reset Time:............................................................Instantaneous, Linear
Time Delay Accuracy:.......................................±3% of expected inverse time or 1 cycle, whichever is
greater
Level Accuracy:....................................................per CT input
SENSITIVE GROUND TIMED OVERCURRENT (51SG)
Ground Current:...................................................Fundamental
Pickup Level: .........................................................0.005 to 3.000 x CT in steps of 0.001 x CT
Dropout Level:......................................................97 to 99% of Pickup @ I > 0.1 x CT
Pickup - 0.02 x CT @ I < 0.1 x CT
Curve Shape:.........................................................ANSI Extremely/Very/Moderately/Normally Inverse
Definite Time
IEC Curve A/B/C/Short
IAC Extreme/Very/Inverse/Short
Curve Multiplier: ..................................................0.05 to 20.0 in steps of 0.1
Reset Time:............................................................Instantaneous, Linear
Time Delay Accuracy:.......................................±3% of expected inverse time or 1 cycle, whichever is
greater
Level Accuracy:....................................................per CT input