GE 745 Instruction Manual page 136

S2 SYSTEM SETUP
5–40
• 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:
Table 5–3: RTD resistance vs. temperature
Temperature 100 Ω Platinum
–50°C
–40°C
–30°C
–20°C
–10°C
0°C
10°C
20°C
30°C
40°C
50°C
60°C
70°C
80°C
90°C
100°C
110°C
120°C
130°C
140°C
150°C
160°C
170°C
180°C
190°C
200°C
210°C
220°C
230°C
240°C
250°C
• AVERAGE AMBIENT TEMPERATURE (BY MONTH): This message is displayed only when
the
AMBIENT RTD TYPE
the calculation of Insulation Aging and must be enabled for the function to operate.
120 Ω Nickel
80.31 Ω 86.17 Ω
84.27 Ω 92.76 Ω
88.22 Ω 99.41 Ω
92.16 Ω 106.15 Ω
96.09 Ω 113.00 Ω
100.00 Ω 120.00 Ω
103.90 Ω 127.17 Ω
107.79 Ω 134.52 Ω
111.67 Ω 142.06 Ω
115.54 Ω 149.79 Ω
119.39 Ω 157.74 Ω
123.24 Ω 165.90 Ω
127.07 Ω 174.25 Ω
130.89 Ω 182.84 Ω
134.70 Ω 191.64 Ω
138.50 Ω 200.64 Ω
142.29 Ω 209.85 Ω
146.06 Ω 219.29 Ω
149.82 Ω 228.96 Ω
153.58 Ω 238.85 Ω
157.32 Ω 248.95 Ω
161.04 Ω 259.30 Ω
164.76 Ω 269.91 Ω
168.47 Ω 280.77 Ω
172.46 Ω 291.96 Ω
175.84 Ω 303.46 Ω
179.51 Ω 315.31 Ω
183.17 Ω 327.54 Ω
186.82 Ω 340.14 Ω
190.45 Ω 353.14 Ω
194.08 Ω 366.53 Ω
is set for "By Monthly Average". Ambient temperature is used in
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
100 Ω Nickel
71.81 Ω
79.13 Ω
84.15 Ω
89.23 Ω
94.58 Ω
100.00 Ω
105.60 Ω
111.20 Ω
117.10 Ω
123.01 Ω
129.11 Ω
135.34 Ω
141.72 Ω
148.25 Ω
154.90 Ω
161.78 Ω
168.79 Ω
175.98 Ω
183.35 Ω
190.90 Ω
198.66 Ω
206.62 Ω
214.81 Ω
223.22 Ω
243.30 Ω
252.88 Ω
262.76 Ω
272.94 Ω
283.94 Ω
294.28 Ω
305.44 Ω