GE 745 TRANSFORMER MANAGEMENT RELAY

GE Power Management 745 Transformer Management Relay 5-39
5 SETPOINTS 5.4 S2 SYSTEM SETUP
5
5.4.8 AMBIENT TEMPERATURE
The 745 provides an RTD input for monitoring the ambient temperature. The three RTD types which may be
used are 100
Ω
platinum, 120
Ω
nickel, and 100
Ω
nickel, the characteristics of which are as follows:
There is a display for each month similar to the box above.
Table 5–4: RTD RESISTANCE VS. TEMPERATURE
Temperature
(° Celsius)
100
Ω
Platinum
(DIN 43760)
120
Ω
Nickel
100
Ω
Nickel
Temperature
(° Celsius)
100
Ω
Platinum
(DIN 43760)
120
Ω
Nickel
100
Ω
Nickel
–50 80.31 86.17 71.81 110 142.29 209.85 174.87
–40 84.27 92.76 77.30 120 146.06 219.29 182.75
–30 88.22 99.41 82.84 130 149.82 228.96 190.80
–20 92.16 106.15 88.45 140 153.58 238.85 199.04
–10 96.09 113.00 94.17 150 157.32 248.95 207.45
0 100.00 120.00 100.00 160 161.04 259.30 216.08
10 103.90 127.17 105.97 170 164.76 269.91 224.92
20 107.79 134.52 112.10 180 168.47 280.77 233.97
30 111.67 142.06 118.38 190 172.46 291.96 243.30
40 115.54 149.79 124.82 200 175.84 303.46 252.88
50 119.39 157.74 131.45 210 179.51 315.31 262.76
60 123.24 165.90 138.25 220 183.17 327.54 272.94
70 127.07 174.25 145.20 230 186.82 340.14 283.45
80 130.89 182.84 152.37 240 190.45 353.14 294.28
90 134.70 191.64 159.70 250 194.08 366.53 305.44
100 138.50 200.64 167.20
y AMBIENT TEMP
y [ENTER] for more
This message indicates the start of the
AMBIENT TEMP
section. To continue
these setpoints press , or press to go to the next section.
AMBIENT TEMPERATURE
SENSING: Disabled
Range: Disabled / Enabled
Enter
Enabled
to use an RTD to monitor ambient temperature.
AMBIENT RTD TYPE:
100
Ω
Platinum
Range: 100
Ω
Platinum / 120
Ω
Nickel / 100
Ω
Nickel / By Monthly Average
Enter the RTD sensor type being used.
AVERAGE AMBIENT TEMP
FOR JANUARY: 20ºC
Range: –50ºC to 125ºC (steps)
This message is displayed only when the
AMBIENT RTD TYPE
is set for
By
Monthly Average
. Ambient temperature is used in the calculation of Insulation
Aging and must be enabled for the function to operate.
ENTER
MESSAGE
NOTE