Specifications; Protection Elements - GE T35 UR Series Instruction Manual

2 PRODUCT DESCRIPTION
2.2SPECIFICATIONSSPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
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
NOTE
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
nd
2 harmonic inhibit level: 1.0 to 40.0% in steps of 0.1
nd
2 harmonic inhibit function: Adaptive, Traditional, Disabled
nd
2 harmonic inhibit mode: Per-phase, 2-out-of-3, Average
th
5 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
<20 ms at 3 × pickup at 60 Hz
Operate time:
GE Multilin
PHASE/GROUND TOC
Current:
Pickup level:
Dropout level:
Level accuracy:
0.1 to 2.0 × CT:
> 2.0 × CT:
Curve shapes:
Curve multiplier:
Reset type:
Curve timing accuracy
at 1.03 to 20 x pickup:
Voltage restraint:
BREAKER ARCING CURRENT
Principle:
Initiation:
Compensation for auxiliary relays: 0 to 65.535 s in steps of 0.001
Alarm threshold:
Fault duration accuracy: 0.25 of a power cycle
Availability:
THERMAL OVERLOAD PROTECTION
Thermal overload curves: IEC 255-8 curve
Base current:
Overload (k) factor:
Trip time constant:
Reset time constant:
Minimum reset time:
Timer accuracy (cold curve): ±100 ms or 2%, whichever is greater
Timer accuracy (hot curve): ±500 ms or 2%, whichever is greater
T35 Transformer Protection System

2.2 SPECIFICATIONS

2.2.1 PROTECTION ELEMENTS

Phasor or RMS
0.000 to 30.000 pu in steps of 0.001
97% to 98% of pickup
±0.5% of reading or ±0.4% of rated
(whichever is greater)
±1.5% of reading > 2.0 × CT rating
IEEE Moderately/Very/Extremely
Inverse; IEC (and BS) A/B/C and Short
Inverse; GE IAC Inverse, Short/Very/
2
Extremely Inverse; I t; FlexCurves™
(programmable); Definite Time (0.01 s
base curve)
Time Dial = 0.00 to 600.00 in steps of
0.01
Instantaneous/Timed (per IEEE)
±3.5% of operate time or ±½ cycle
(whichever is greater) from pickup to
operate
Modifies pickup current for voltage in the
range of 0.1<V<0.9 VT Nominal in a
fixed linear relationship
2
accumulates breaker duty (I t) and mea-
sures fault duration
programmable per phase from any Flex-
Logic operand
0 to 50000 kA2-cycle in steps of 1
1 per CT bank with a minimum of 2
0.20 to 3.00 pu in steps of 0.01
1.00 to 1.20 pu in steps of 0.05
0 to 1000 min. in steps of 1
0 to 1000 min. in steps of 1
0 to 1000 min. in steps of 1
for I < 0.9 × k × I and I / (k × I ) > 1.1
p b b
2
2-9