GE L90

5-424 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
TRANSDUCER INPUTS/OUTPUTS CHAPTER 5: SETTINGS
5
Settings are automatically generated for every channel available in the specific relay as shown above for the first channel
of a type 5C transducer module installed in the first available slot.
The function of the channel can be either “Enabled” or “Disabled.” If “Disabled,” there is not an actual value created for the
channel. An alphanumeric ID is assigned to the channel; this ID is included in the channel actual values. It is also used to
reference the channel as the input parameter to features designed to measure this type of parameter. Selecting the type of
RTD connected to the channel configures the channel.
Actions based on RTD overtemperature, such as trips or alarms, are done in conjunction with the FlexElements feature. In
FlexElements, the operate level is scaled to a base of 100°C. For example, a trip level of 150°C is achieved by setting the
operate level at 1.5 pu. FlexElement operands are available to FlexLogic for further interlocking or to operate an output
contact directly.
See the following table for reference temperature values for each RTD type.
Table 5-44: RTD temperature vs. resistance
Temperature Resistance (in ohms)
°C °F 100  Pt
(DIN 43760)
120  Ni 100  Ni 10  Cu
–50 –58 80.31 86.17 71.81 7.10
–40 –40 84.27 92.76 77.30 7.49
–30 –22 88.22 99.41 82.84 7.88
–20 –4 92.16 106.15 88.45 8.26
–10 14 96.09 113.00 94.17 8.65
0 32 100.00 120.00 100.00 9.04
10 50 103.90 127.17 105.97 9.42
20 68 107.79 134.52 112.10 9.81
30 86 111.67 142.06 118.38 10.19
40 104 115.54 149.79 124.82 10.58
50 122 119.39 157.74 131.45 10.97
60 140 123.24 165.90 138.25 11.35
70 158 127.07 174.25 145.20 11.74
80 176 130.89 182.84 152.37 12.12
90 194 134.70 191.64 159.70 12.51
100 212 138.50 200.64 167.20 12.90
110 230 142.29 209.85 174.87 13.28
120 248 146.06 219.29 182.75 13.67
130 266 149.82 228.96 190.80 14.06
140 284 153.58 238.85 199.04 14.44
150 302 157.32 248.95 207.45 14.83
160 320 161.04 259.30 216.08 15.22
170 338 164.76 269.91 224.92 15.61
180 356 168.47 280.77 233.97 16.00
190 374 172.46 291.96 243.30 16.39
200 392 175.84 303.46 252.88 16.78
210 410 179.51 315.31 262.76 17.17
220 428 183.17 327.54 272.94 17.56
230 446 186.82 340.14 283.45 17.95
240 464 190.45 353.14 294.28 18.34
250 482 194.08 366.53 305.44 18.73