GE T35 User Manual

CHAPTER 5: SETTINGS GROUPED ELEMENTS
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-199
5
Each of the six setting group menus is identical. Setting group 1 (the default active group) is active automatically when no
other group is active.
If the device incorrectly switches to group 1 after power cycling, upgrade the firmware to version 7.31 or later to correct
this issue.
5.7.3 Transformer elements
5.7.3.1 Menu
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  TRANSFORMER
This menu contains the settings for the transformer differential elements and the transformer thermal elements.
The thermal elements include hottest-spot temperature, aging factor and loss of life. The computation of these elements
follows IEEE standards C57.91-1995: “IEEE Guide for Loading Mineral-Oil-Immersed Transformers” and C57.96-1989: “IEEE
Guide for Loading Dry-Type Distribution Transformers”. The computations are based on transformer loading conditions,
ambient temperature, and the entered transformer data.
5.7.3.2 Percent differential (ANSI 87T)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  TRANSFORMER  PERCENT DIFFERENTIAL
 TRANSFORMER


 PERCENT
 DIFFERENTIAL
See below

 INSTANTANEOUS
 DIFFERENTIAL
See page 5-205

 HOTTEST-SPOT
 TEMPERATURE
See page 5-205

 AGING FACTOR

See page 5-206

 LOSS OF LIFE

See page 5-207
 PERCENT
 DIFFERENTIAL

PERCENT DIFFERENTIAL
FUNCTION: Disabled
Range: Disabled, Enabled

PERCENT DIFFERENTIAL
PICKUP: 0.100 pu
Range: 0.050 to 1.000 pu in steps of 0.001

PERCENT DIFFERENTIAL
SLOPE 1: 25%
Range: 15 to 100% in steps of 1

PERCENT DIFFERENTIAL
BREAK 1: 2.000 pu
Range: 1.000 to 2.000 pu in steps of 0.001

PERCENT DIFFERENTIAL
BREAK 2: 8.000 pu
Range: 2.000 to 30.000 pu in steps of 0.001

PERCENT DIFFERENTIAL
SLOPE 2: 90%
Range: 50 to 100% in steps of 1

INRUSH INHIBIT
FUNCTION: Adapt. 2nd
Range: Disabled, Adapt. 2nd, Trad. 2nd

INRUSH INHIBIT
MODE: Per phase
Range: Per phase, 2-out-of-3, Average, 1-out-of-3

INRUSH INHIBIT
LEVEL: 20.0% fo
Range: 1.0 to 40.0% of f
0
in steps of 0.1

OVEREXCITN INHIBIT
FUNCTION: Disabled
Range: Disabled, 5th

GE T35 Specifications

General

Brand	GE
Model	T35
Category	Relays
Language	English