General Transformer Settings - GE T60 Instruction Manual

5.4 SYSTEM SETUP
5
The T60 Transformer Protection System has been designed to provide primary protection for medium to high voltage power
transformers. It is able to perform this function on 2 to 5 winding transformers in a variety of system configurations.
b) GENERAL TRANSFORMER SETTINGS

PATH: SETTINGS
 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: When set to Automatic Selection, a CT ratio mismatch can occur in firmware versions up to
7.1x that can cause signal clamping and misoperation on the differential element. To avoid this, manually select the
winding as outlined in the T35/T60 Reference Winding Selection and CT Ratio Mismatch Application Note (document
GET-8548). For releases subsequent to 7.1x, contact GE Digital Energy to inquire if this applies.
• PHASE COMPENSATION: Selects the type of phase compensation to be performed by the relay. If set to "Internal
(software)", the transformer phase shift is compensated internally by the relay algorithm. If set to "External (with CTs)",
the transformer phase shift is externally compensated by the CT connections.
• LOAD LOSS AT RATED LOAD: This setting should be taken from the transformer nameplate. If not available from the
nameplate, the setting value can be computed as
the three-phase series resistance. The setting is used as an input for the calculation of the hottest-spot winding tem-
perature.
5-108
 WINDING 4
MESSAGE

 WINDING 5
MESSAGE

 WINDING 6
MESSAGE

 THERMAL INPUTS
MESSAGE


SYSTEM SETUP TRANSFORMER
NUMBER OF WINDINGS:
2
REFERENCE WINDING:
MESSAGE
Automatic Selection
PHASE COMPENSATION:
MESSAGE
Internal (software)
LOAD LOSS AT RATED
MESSAGE
LOAD:
RATED WINDING TEMP
MESSAGE
RISE: 65°C (oil)
NO LOAD LOSS:
MESSAGE
10 kW
TYPE OF COOLING:
MESSAGE
OA
TOP-OIL RISE OVER
MESSAGE
AMBIENT:
THERMAL CAPACITY:
MESSAGE
100.00 kWh/°C
WINDING THERMAL TIME
MESSAGE
CONSTANT: 2.00 min
T60 Transformer Protection System
See page 5–110.
See page 5–110.
See page 5–110.
See page 5–119.

GENERAL
Range: 2 to 6 in steps of 1
Range: Automatic Selection, Winding 1, Winding 2,...,
Range: Internal (software), External (with CTs)
Range: 1 to 20000 kW in steps of 1
100 kW
Range: 55°C (oil), 65°C (oil), 80°C (dry), 115°C (dry),
Range: 1 to 20000 kW in steps of 1
Range: OA, FA, Non-directed FOA/FOW, Directed FOA/
Range: 1 to 200°C in steps of 1
35°C
Range: 0.00 to 200.00 kWh/°C in steps of 0.01
Range: 0.25 to 15.00 min. in steps of 0.01
2

P I R , where I
=
 
R n W n W
5 SETTINGS
Winding 5
150°C (dry)
FOW, Sealed Self Cooled, Vented Self Cooled,
Forced Cooled
is the winding rated current and R is
 
GE Multilin