CHAPTER 1: INTRODUCTION SPECIFICATIONS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–7
Specifications
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 TIME OVERCURRENT (51P/51N/51G)
Pickup Level:..........................................................0.05 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 (0.1 s base curve)
IEC Curve A/B/C/Short
IAC Extreme/Very/Inverse/Short
User Curve, FlexCurve™ A/B (programmable curves)
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 TIME OVERCURRENT (51SG)
Pickup Level:..........................................................0.005 to 3 x CT in steps of 0.001 x CT
Dropout Level: ......................................................97 to 99% of Pickup @ I > 0.1 x CT
Pickup - 0.002 x CT @ I < 0.1 x CT
Curve Shape:.........................................................ANSI Extremely/Very/Moderately/Normally Inverse
Definite Time (0.1 s base curve)
IEC Curve A/B/C/Short Inverse
IAC Extreme/Very/Inverse/Short Inverse
User Curve, FlexCurve™ A/B
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
PHASE/NEUTRAL/GROUND/NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT
(50P/50N/50G/50_2)
Pickup Level:..........................................................0.05 to 20 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
Time Delay:............................................................0.00 to 300.00 sec in steps of 0.01
Operate Time:.......................................................<30 ms @ 60Hz (I > 2.0 x PKP, No time delay)
<35 ms @ 50Hz (I > 2.0 x PKP, No time delay)
Time Delay Accuracy:.......................................0 to 1 cycle (Time Delay selected)
Level Accuracy:....................................................per CT input
Courtesy of NationalSwitchgear.com
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