GE Multilin
T35 Transformer Protection System
2-9
2 PRODUCT DESCRIPTION
2.2 SPECIFICATIONS
2
2.2SPECIFICATIONS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
2.2.1 PROTECTION ELEMENTS
The operating times include the activation time of a trip rated form-A output contact unless otherwise indicated.
FlexLogic operands of a given element are 4 ms faster. Take this into account when using FlexLogic to interconnect
with other protection or control elements of the relay, building FlexLogic equations, or interfacing with other IEDs or
power system devices via communications or different output contacts. If not specified, operate times are given
here for a 60 Hz system at nominal system frequency. Operate times for a 50 Hz system are 1.2 times longer.
PERCENT DIFFERENTIAL
Characteristic:
Dual slope percent differential
Minimum pickup:
0.05 to 1.00 pu in steps of 0.001
Slope 1 range:
15 to 100% in steps of 1%
Slope 2 range:
50 to 100% in steps of 1%
Kneepoint 1:
1.0 to 2.0 pu in steps of 0.0001
Kneepoint 2:
2.0 to 30.0 pu in steps of 0.0001
2
nd
harmonic inhibit level: 1.0 to 40.0% in steps of 0.1
2
nd
harmonic inhibit function: Adaptive, Traditional, Disabled
2
nd
harmonic inhibit mode: Per-phase, 2-out-of-3, Average
5
th
harmonic inhibit range: 1.0 to 40.0% in steps of 0.1
Operate times:
Harmonic inhibits selected: 20 to 30 ms at 60 Hz;
20 to 35 ms at 50 Hz
No harmonic inhibits selected: 5 to 20 ms
Dropout level:
97 to 98% of pickup
Level accuracy:
±0.5% of reading or ±1% of rated
(whichever is greater) for two windings
setup
INSTANTANEOUS DIFFERENTIAL
Pickup level:
2.00 to 30.00 pu in steps of 0.01
Dropout level:
97 to 98% of pickup
Level accuracy:
±0.5% of reading or ±1% of rated
(whichever is greater) for two winding
setup
Operate time:
<
20 ms at 3
×
pickup at 60 Hz
PHASE/GROUND TOC
Current:
Phasor or RMS
Pickup level:
0.000 to 30.000 pu in steps of 0.001
Dropout level:
97% to 98% of pickup
Level accuracy:
0.1 to 2.0
×
CT:
±0.5% of reading or ±0.4% of rated
(whichever is greater)
> 2.0
×
CT:
±1.5% of reading > 2.0
×
CT rating
Curve shapes:
IEEE Moderately/Very/Extremely
Inverse; IEC (and BS) A/B/C and Short
Inverse; GE IAC Inverse, Short/Very/
Extremely Inverse; I
2
t; FlexCurves™
(programmable); Definite Time (0.01 s
base curve)
Curve multiplier:
Time Dial = 0.00 to 600.00 in steps of
0.01
Reset type:
Instantaneous/Timed (per IEEE)
Curve timing accuracy
at 1.03 to 20 x pickup:
±3.5% of operate time or ±½ cycle
(whichever is greater) from pickup to
operate
Voltage restraint:
Modifies pickup current for voltage in the
range of 0.1<V<0.9 VT Nominal in a
fixed linear relationship
BREAKER ARCING CURRENT
Principle:
accumulates breaker duty (I
2
t) and mea-
sures fault duration
Initiation:
programmable per phase from any Flex-
Logic operand
Compensation for auxiliary relays: 0 to 65.535 s in steps of 0.001
Alarm threshold:
0 to 50000 kA2-cycle in steps of 1
Fault duration accuracy: 0.25 of a power cycle
Availability:
1 per CT bank with a minimum of 2
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
Timer accuracy (cold curve): ±100 ms or 2%, whichever is greater
Timer accuracy (hot curve): ±500 ms or 2%, whichever is greater
for
I
p
< 0.9 ×
k
×
I
b
and I / (
k
×
I
b
) > 1.1
NOTE
Summary of Contents for T35 UR Series
Page 10: ...x T35 Transformer Protection System GE Multilin TABLE OF CONTENTS ...
Page 48: ...2 18 T35 Transformer Protection System GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Page 314: ...5 192 T35 Transformer Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 338: ...6 24 T35 Transformer Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 350: ...7 12 T35 Transformer Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Page 366: ...8 16 T35 Transformer Protection System GE Multilin 8 2 CYBERSENTRY 8 SECURITY 8 ...
Page 406: ...A 14 T35 Transformer Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 540: ...D 10 T35 Transformer Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIX D D ...
Page 552: ...E 12 T35 Transformer Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 560: ...F 8 T35 Transformer Protection System GE Multilin F 3 WARRANTY APPENDIX F F ...
