4.152
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
temperature trip if one or two of the healthy winding RTDs indicate a
temperature greater than their RTD trip temperature settings. Two winding
RTDs must indicate excessive temperature when the winding trip voting
setting equals Y. Only one excessive temperature indication is necessary if
winding trip voting is not enabled. Bearing trip voting works similarly.
The warning and trip temperature settings for bearing, ambient, and other
RTD types function similarly, except that trip voting is not available for
ambient and other RTDs.
To disable any of the temperature warning or trip functions, set the appropriate
temperature setting to OFF.
Only healthy RTDs can contribute temperatures to the warning and trip
functions. The relay includes specific logic to indicate if RTD leads are
shorted or open. Table 4.46 lists the RTD resistance versus temperature for the
four supported RTD types.
Table 4.46
RTD Resistance Versus Temperature
(Sheet 1 of 2)
Temp
(°F)
Temp
(°C)
100
Platinum
120
Nickel
100
Nickel
10
Copper
–58
–50.00
80.31
86.17
74.30
7.10
–40
–40.00
84.27
92.76
79.10
7.49
–22
–30.00
88.22
99.41
84.20
7.88
–4
–20.00
92.16
106.15
89.30
8.26
14
–10.00
96.09
113.00
94.60
8.65
32
0.00
100.00
120.00
100.00
9.04
50
10.00
103.90
127.17
105.60
9.42
68
20.00
107.79
134.52
111.20
9.81
86
30.00
111.67
142.06
117.10
10.19
104
40.00
115.54
149.79
123.00
10.58
122
50.00
119.39
157.74
129.10
10.97
140
60.00
123.24
165.90
135.30
11.35
158
70.00
127.07
174.25
141.70
11.74
176
80.00
130.89
182.84
148.30
12.12
194
90.00
134.70
191.64
154.90
12.51
212
100.00
138.50
200.64
161.80
12.90
230
110.00
142.29
209.85
168.80
13.28
248
120.00
146.06
219.29
176.00
13.67
266
130.00
149.83
228.96
183.30
14.06
284
140.00
153.58
238.85
190.90
14.44
302
150.00
157.32
248.95
198.70
14.83
320
160.00
161.05
259.30
206.60
15.22
338
170.00
164.77
269.91
214.80
15.61
356
180.00
168.47
280.77
223.20
16.00
374
190.00
172.17
291.96
231.80
16.39
392
200.00
175.85
303.46
240.70
16.78
410
210.00
179.15
315.31
249.80
17.17
428
220.00
183.17
327.54
259.20
17.56
Summary of Contents for SEL-700G Series
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