GE 745 - 6.3.6.3 Current Demand; 6.3.7 Ambient Temperature; 6.3.8 Loss of Life

6–14 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
A2 METERING CHAPTER 6: ACTUAL VALUES
6.3.6.3 Current Demand
PATH: ACTUAL VALUES
 A2 METERING  DEMAND  W1(3) CURRENT DEMAND
The current demand for winding 1 phases A through C are displayed in these messages.
The maximum current demand, the phase in which it occurred, and the date and time it
occurred are also shown. If the date has never been programmed, the default values
shown above appear. These messages are repeated for windings 2 and 3.
6.3.7 Ambient Temperature
PATH: ACTUAL VALUES  A2 METERING  AMBIENT TEMPERATURE
Ambient temperature is monitored via an RTD connected to the 745.
6.3.8 Loss of Life
PATH: ACTUAL VALUES  A2 METERING  LOSS OF LIFE
The HOTTEST-SPOT WINDING TEMPERATURE is calculated from the ambient temperature
and the highest-load winding current. The INSULATION AGING FACTOR is calculated from
the hottest-spot temperature. The TOTAL ACCUM LOSS OF LIFE value displays the total
equivalent service hours of the transformer.
 W1 CURRENT []
DEMAND
W1 PHASE A CURRENT
DEMAND: 0 A
MESSAGE
W1 PHASE B CURRENT
DEMAND: 0 A
MESSAGE
W1 PHASE C CURRENT
DEMAND: 0 A
MESSAGE
MAXIMUM W1 DEMAND:
0 A in phase A
MESSAGE
MAXIMUM W1 DEMAND
DATE: Jan 01 1996
MESSAGE
MAXIMUM W1 DEMAND
TIME: 00:00:00.000
 AMBIENT []
TEMPERATURE
AMBIENT TEMPERATURE:
0°C
 LOSS OF LIFE [] HOTTEST-SPOT WINDING
TEMPERATURE: 1°C
MESSAGE
INSULATION AGING
FACTOR: 0.0
MESSAGE
TOTAL ACCUM LOSS OF
LIFE: 0.00 hours