Transformer Elements - GE T35 Instruction Manual

CHAPTER 5: SETTINGS
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
 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
 PERCENT
 DIFFERENTIAL
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
 PERCENT

 DIFFERENTIAL
 INSTANTANEOUS

 DIFFERENTIAL
 HOTTEST-SPOT

 TEMPERATURE
 AGING FACTOR


 LOSS OF LIFE


PERCENT DIFFERENTIAL

FUNCTION: Disabled
PERCENT DIFFERENTIAL

PICKUP: 0.100 pu
PERCENT DIFFERENTIAL

SLOPE 1: 25%
PERCENT DIFFERENTIAL

BREAK 1: 2.000 pu
PERCENT DIFFERENTIAL

BREAK 2: 8.000 pu
PERCENT DIFFERENTIAL

SLOPE 2: 90%
INRUSH INHIBIT

FUNCTION: Adapt. 2nd
INRUSH INHIBIT

MODE: Per phase
INRUSH INHIBIT

LEVEL: 20.0% fo
OVEREXCITN INHIBIT

FUNCTION: Disabled
GROUPED ELEMENTS
See below
See page 5-205
See page 5-205
See page 5-206
See page 5-207
Range: Disabled, Enabled
Range: 0.050 to 1.000 pu in steps of 0.001
Range: 15 to 100% in steps of 1
Range: 1.000 to 2.000 pu in steps of 0.001
Range: 2.000 to 30.000 pu in steps of 0.001
Range: 50 to 100% in steps of 1
Range: Disabled, Adapt. 2nd, Trad. 2nd
Range: Per phase, 2-out-of-3, Average, 1-out-of-3
Range: 1.0 to 40.0% of f in steps of 0.1
0
Range: Disabled, 5th
5
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