CHAPTER 5: SETTINGS SYSTEM SETUP
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-147
5
5.5.4 Transformer
5.5.4.1 Menu
SETTINGS SYSTEM SETUP TRANSFORMER
The T35 provides primary protection for medium to high voltage power transformers. It performs this function on a variety
of power transformer configurations with up to six sets of three phase inputs available.
5.5.4.2 General transformer settings
SETTINGS SYSTEM SETUP TRANSFORMER GENERAL
The general transformer settings apply to all windings. Settings specific to each winding are shown in the following
section.
NUMBER OF WINDINGS — Selects the number of windings for transformer setup.
REFERENCE WINDING — Reference winding is the winding to which all currents are referred. That is, the currents from all
other windings are normalized (magnitude compensation) to this winding, and the per unit value of the differential
currents, the restraint currents, and the corresponding differential characteristics (pickup, break points, and so on) are all
based on the CT Nominal of this winding. The reference winding can be selected either automatically or manually. When
TRANSFORMER
GENERAL
See below
WINDING 1
See page 5-149
WINDING 6
THERMAL INPUTS
See page 5-158
GENERAL
NUMBER OF WINDINGS:
2
Range: 2 to 6 in steps of 1
REFERENCE WINDING:
Automatic Selection
Range: Automatic Selection, Winding 1, Winding 2,...,
Winding 6
PHASE COMPENSATION:
Internal (software)
Range: Internal (software), External (with CTs)
LOAD LOSS AT RATED
LOAD: 100 kW
Range: 1 to 20000 kW in steps of 1
RATED WINDING TEMP
RISE: 65°C (oil)
Range: 55°C (oil), 65°C (oil), 80°C (dry), 115°C (dry),
150°C (dry)
NO LOAD LOSS:
10 kW
Range: 1 to 20000 kW in steps of 1
TYPE OF COOLING:
OA
Range: OA, FA, Non-directed FOA/FOW, Directed FOA/FOW
TOP-OIL RISE OVER
AMBIENT: 35°C
Range: 1 to 200°C in steps of 1
THERMAL CAPACITY:
100.00 kWh/°C
Range: 0.00 to 200.00 kWh/°C in steps of 0.01
WINDING THERMAL TIME
CONSTANT: 2.00 min
Range: 0.25 to 15.00 min. in steps of 0.01
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