GE 745 Instruction Manual page 252

METERING
7.4.5.3 Ambient Temperature by Monthly Averages
7.4.6 Analog outputs
7–14
Table 7–1: Measured RTD temperature
RTD type Ω
100 Platinum
resistance
120 Ω Nickel 86.17
120.0
157.74
200.64
248.95
303.46
366.53
100 Ω Nickel 71.81
100.00
131.45
167.20
207.45
252.88
305.44
 If the ambient temperature is entered as 12 monthly averages, program
the value for the month during which the relay is being commissioned.
 Examine the
TEMPERATURE
 Verify that values entered for other months do not affect the value for
the present month.
The analog output settings are located in the
setpoints section.
 Connect a milliammeter to the analog output contacts: COM on A5 and
analog output 1 on A6, analog output 2 on A7, analog output 3 on A8,
analog output 4 on A9, analog output 5 on A10, analog output 6 on A11,
or analog output 7 on A12.
 From the settings used for the tested analog output, determine the mA
range for the output and the driving signal and its range for the full
range of output current.
 Apply the input signal and vary its amplitude over the full range and
ensure the analog output current is the correct amplitude.
 Record the results in the table below.
 Duplicate as required for each analog output.
CHAPTER 7: COMMISSIONING
Expected RTD reading
°C °F
–50 –58
0 32
50 122
100 212
150 302
200 392
250 482
–50 –58
0 32
50 122
100 212
150 302
200 392
250 482
A2 METERING AMBIENT TEMP

actual value to verify the programmed temperature.
S2 SYSTEM SETUP
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Measured RTD temperature
____°C ____°F (select one)
AMBIENT

ANALOG OUTPUTS
