GE T35 User Manual

2-20 T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 2: PRODUCT DESCRIPTION
2
BREAKER ARCING CURRENT
Principle: accumulates breaker duty (I
2
t) and measures fault duration
Initiation: programmable per phase from any FlexLogic operand
Compensation for auxiliary relays: 0 to 65.535 s in steps of 0.001
Alarm threshold: 0 to 50000 kA
2
-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
TRIP BUS (TRIP WITHOUT FLEXLOGIC)
Number of elements: 6
Number of inputs: 16
Operate time: <2 ms at 60 Hz
Timer accuracy: ±3% or 10 ms, whichever is greater
2.5.2 User-programmable elements
FLEXLOGIC
Programming language: Reverse Polish Notation with graphical visualization (keypad programmable)
Lines of code: 1024
Internal variables: 64
Supported operations: NOT, XOR, OR (2 to 16 inputs), AND (2 to 16 inputs), NOR (2 to 16 inputs), NAND (2 to 16 inputs),
latch (reset-dominant), edge detectors, timers
Inputs: any logical variable, contact, or virtual input
Number of timers: 32
Pickup delay: 0 to 60000 (ms, sec., min.) in steps of 1
Dropout delay: 0 to 60000 (ms, sec., min.) in steps of 1
FLEXCURVES™
Number: 4 (A through D)
Reset points: 40 (0 through 1 of pickup)
Operate points: 80 (1 through 20 of pickup)
Time delay: 0 to 65535 ms in steps of 1
FLEX STATES
Number: up to 256 logical variables grouped under 16 Modbus addresses
Programmability: any logical variable, contact, or virtual input
FLEXELEMENTS™
Number of elements: 16
Operating signal: any analog actual value, or two values in differential mode
Operating signal mode: signed or absolute value
Operating mode: level, delta
Comparator direction: over, under
Pickup Level: –90.000 to 90.000 pu in steps of 0.001
Hysteresis: 0.1 to 50.0% in steps of 0.1
Delta dt: 20 ms to 60 days

GE T35 Specifications

General

Brand	GE
Model	T35
Category	Relays
Language	English