GE Multilin 745 User Manual

Overview
http://www.GEindustrial.com/multilin
2–5
GE Multilin
Specifications
745
Transformer Management Relay
Protection Elements PERCENT DIFFERENTIAL
Operating current pickup: 0.05 to 1.00 × CT
in steps of 0.01
Dropout level: 97 to 98% of pickup
Slope-1 range: 15% to 100% in steps of 1
Slope-2 range: 50% to 100% in steps of 1
KP (Slope-1 kneepoint): 1.0 to 20.0 × CT in
steps of 0.1
Harmonic restraint: 0.1 to 65.0% in steps of
0.1
Solid state output operate time:
at pickup < 1 × CT: 42 to 52 ms
at 1 × CT < pickup < 1.1 × kneepoint: 34 to
44 ms
at pickup > 1.1 × kneepoint: 26 to 36 ms
Relay outputs 2 to 5 operate time:
at pickup < 1 × CT: 46 to 56 ms
at 1 × CT < pickup < 1.1 × kneepoint: 38 to
48 ms
at pickup > 1.1 × kneepoint: 30 to 40 ms
INSTANTANEOUS DIFFERENTIAL
OVERCURRENT
Pickup level: 3.00 to 20.00 × CT in steps of
0.01
Dropout level: 97 to 98% of Pickup
Level accuracy: per current input
Solid state output operate time:
at 1.2 × pickup: 22 to 30 ms
at 2.0 × pickup: 18 to 26 ms
at 4.0 × pickup: 11 to 19 ms
Relay outputs 2 to 5 operate time:
at 1.2 × pickup: 28 to 36 ms
at 2.0 × pickup: 24 to 32 ms
at 4.0 × pickup: 17 to 25 ms
PHASE / NEUTRAL / GROUND /
NEGATIVE SEQUENCE TIME
OVERCURRENT
Pickup level: 0.05 to 20.00 × CT in steps of
0.01
Dropout level: 97 to 98% of pickup
Curve shapes: ANSI Extremely/Very/
Moderately/Normally Inverse;
Definite Time (0.1 s base
curve); IEC Curve A/B/C and
Short; FlexCurve™ A/B/C
(programmable curves); IAC
Extreme/Very/Inverse/Short
Curve multiplier: 0.5 to 30 for ANSI, IAC,
and FlexCurves™ in steps of
0.1 s; 0.05 to 100.00 for IEC
curves in steps of 0.01
Reset type: Instantaneous or Linear
Level accuracy: Per current input
Timing accuracy: ±3% of trip time or ±20
ms (whichever is greater) at ≥
1.03 × pickup
PHASE / NEUTRAL / GROUND /
NEGATIVE SEQUENCE
INSTANTANEOUS OVERCURRENT
Pickup level: 0.05 to 20.00 × CT in steps of
0.01
Dropout level: 97 to 98% of pickup
Time delay: 0 to 60000 ms in steps of 1
Level accuracy: Per current input
Solid state output operate time:
at 1.2 × pickup: 22 to 30 ms
at 2.0 × pickup: 18 to 26 ms
at 4.0 × pickup: 11 to 19 ms
Relay outputs 2 to 5 operate time:
at 1.2 × pickup: 28 to 36 ms
at 2.0 × pickup: 24 to 32 ms
at 4.0 × pickup: 17 to 25 ms
RESTRICTED GROUND FAULT
Number of elements: 2
Minimum pickup: 0.02 to 20.00 × CT in steps
of 0.01
Dropout level: 97 to 98% of Pickup
Slope range: 0 to 100% in steps of 1
Pickup delay: 0.00 to 600.00 s in steps of
0.01
Operating time: at 1.1 × pickup: 30 to 40 ms
at 10 × pickup: 20 to 30 ms
UNDERFREQUENCY
Number of elements: 2
Operating current pickup: 0.05 to 1.00 × CT
in steps of 0.01
Operating voltage pickup: 0.10 to 0.99 × VT
in steps of 0.01
Pickup level: 45.00 to 59.99 Hz in steps of
0.01
Dropout level: pickup + 0.03 Hz
Time delay: 0.00 to 600.00 s in steps of
0.01
Signal source: Winding 1 Phase A current /
voltage
Level accuracy: ±0.02 Hz
Solid state output operate time:
at 3% beyond pickup: 120 to 150 ms
Relay outputs 2 to 5 operate time:
at 3% beyond pickup: 125 to 155 ms
(delay set at 0.0 s)

GE Multilin 745 Specifications

General

Brand	GE
Model	Multilin 745
Category	Relays
Language	English