GE Multilin 745

S2 System Setup
745
Transformer Management Relay
Setpoints
http://www.GEindustrial.com/multilin
5–35
GE Multilin
Ambient Temperature PATH: SETPOINTS ! S2 SYSTEM SETUP !" AMBIENT TEMP
• AMBIENT RTD SENSING: Select “Enabled” to use an RTD to monitor ambient
temperature.
• AMBIENT RTD TYPE: The 745 provides an RTD input for monitoring the
ambient temperature. The three RTD types which may be used are 100 Ω
platinum, and 100/120 Ω nickel, the characteristics of which are as follows:
• AVERAGE AMBIENT TEMPERATURE (BY MONTH): 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.
! AMBIENT TEMP [!] AMBIENT TEMPERATURE
SENSING: Disabled
Range: Enabled, Disabled
MESSAGE
AMBIENT RTD TYPE:
100
Ω Platinum
Range: 100 Ω Platinum, 120 Ω Nickel,
100 Ω Nickel, By Monthly
Average
MESSAGE
AVERAGE AMBIENT TEMP
FOR JANUARY: 20°C
Range: –50 to 125°C in steps of 1
↓
MESSAGE
AVERAGE AMBIENT TEMP
FOR DECEMBER: 20°C
Range: –50 to 125°C in steps of 1
Table 5–3: RTD Resistance vs. Temperature
Temperature 100 Ω Platinum 120 Ω Nickel 100 Ω Nickel
–50°C 80.31 Ω 86.17 Ω 71.81 Ω
–40°C 84.27 Ω 92.76 Ω 79.13 Ω
–30°C 88.22 Ω 99.41 Ω 84.15 Ω
–20°C 92.16 Ω 106.15 Ω 89.23 Ω
–10°C 96.09 Ω 113.00 Ω 94.58 Ω
0°C 100.00 Ω 120.00 Ω 100.00 Ω
10°C 103.90 Ω 127.17 Ω 105.60 Ω
20°C 107.79 Ω 134.52 Ω 111.20 Ω
30°C 111.67 Ω 142.06 Ω 117.10 Ω
40°C 115.54 Ω 149.79 Ω 123.01 Ω
50°C 119.39 Ω 157.74 Ω 129.11 Ω
60°C 123.24 Ω 165.90 Ω 135.34 Ω
70°C 127.07 Ω 174.25 Ω 141.72 Ω
80°C 130.89 Ω 182.84 Ω 148.25 Ω
90°C 134.70 Ω 191.64 Ω 154.90 Ω
100°C 138.50 Ω 200.64 Ω 161.78 Ω
110°C 142.29 Ω 209.85 Ω 168.79 Ω
120°C 146.06 Ω 219.29 Ω 175.98 Ω
130°C 149.82 Ω 228.96 Ω 183.35 Ω
140°C 153.58 Ω 238.85 Ω 190.90 Ω
150°C 157.32 Ω 248.95 Ω 198.66 Ω
160°C 161.04 Ω 259.30 Ω 206.62 Ω
170°C 164.76 Ω 269.91 Ω 214.81 Ω
180°C 168.47 Ω 280.77 Ω 223.22 Ω
190°C 172.46 Ω 291.96 Ω 243.30 Ω
200°C 175.84 Ω 303.46 Ω 252.88 Ω
210°C 179.51 Ω 315.31 Ω 262.76 Ω
220°C 183.17 Ω 327.54 Ω 272.94 Ω
230°C 186.82 Ω 340.14 Ω 283.94 Ω
240°C 190.45 Ω 353.14 Ω 294.28 Ω
250°C 194.08 Ω 366.53 Ω 305.44 Ω