Ambient Temperature - GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual

5.4 S2 SYSTEM SETUP
PATH: SETPOINTS S2 SYSTEM SETUP
AMBIENT TEMP
[ENTER] for more
• AMBEINT 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, 120 Ω nickel, and 100 Ω nickel, the characteristics of which are as follows:
Table 5–3: RTD RESISTANCE VS. TEMPERATURE
TEMP
PLATINUM
–50°C
5
–40°C
–30°C
–20°C
–10°C
0°C 100.00
10°C 103.90
20°C 107.79
30°C 111.67
40°C 115.54
50°C 119.39
60°C 123.24
70°C 127.07
80°C 130.89
90°C 134.70
100°C 138.50
• AVERAGE AMBIENT TEMPERATURE (BY MONTH): This message is displayed only when the
set for "By Monthly Average". Ambient temperature is used in the calculation of Insulation Aging and must be enabled
for the function to operate.
5-34
Courtesy of NationalSwitchgear.com
AMBIENT TEMP
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AMBIENT TEMPERATURE

ENTER
SENSING: Disabled
ESCAPE
AMBIENT RTD TYPE:
ESCAPE
100 Ω Platinum
MESSAGE
AVERAGE AMBIENT TEMP
ESCAPE
FOR JANUARY: 20°C
MESSAGE
AVERAGE AMBIENT TEMP
ESCAPE
FOR DECEMBER: 20°C
MESSAGE
100 Ω 120 Ω 100 Ω
NICKEL NICKEL
80.31 86.17 74.25
84.27 92.76 79.13
88.22 99.41 84.15
92.16 106.15 89.30
96.09 113.00 94.58
120.00 100.00
127.17 105.55
134.52 111.24
142.06 117.06
149.79 123.01
157.74 129.11
165.90 135.34
174.25 141.72
182.84 148.25
191.64 154.94
200.64 161.78
745 Transformer Management Relay
Range: Enabled, Disabled
Range: 100 Ω Platinum, 120 Ω Nickel, 100 Ω Nickel,
By Monthly Average
Range: –50 to 125°C in steps of 1. Only seen if
AMBIENT RTD TYPE is "By Monthly Average"
↓
Range: –50 to 125°C in steps of 1. Only seen if
AMBIENT RTD TYPE is "By Monthly Average"
100 Ω
TEMP
PLATINUM
110°C 142.29
120°C 146.06
130°C 149.82
140°C 153.58
150°C 157.32
160°C 161.04
170°C 164.76
180°C 168.47
190°C 172.46
200°C 175.84
210°C 179.51
220°C 183.17
230°C 186.82
240°C 190.45
250°C 194.08
5 SETPOINTS
5.4.8 AMBIENT TEMPERATURE
120 Ω 100 Ω
NICKEL NICKEL
209.85 168.79
219.29 175.98
228.96 183.35
238.85 190.90
248.95 198.66
259.30 206.62
269.91 214.81
280.77 223.22
291.96
303.46
315.31
327.54
340.14
353.14
366.53
AMBIENT RTD TYPE
GE Multilin
is