GE T60, Instruction Manual

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GE Multilin T60 Transformer Protection System 5-333
5 SETTINGS 5.9 TRANSDUCER INPUTS AND OUTPUTS
5
• If the
RRTD 1 APPLICATION
setting is “Group 1” or “Group 2”, then a value of “Other” is written to the RRTD device.
An RRTD actual value of –43°C implies that the
RRTD 1 FUNCTION
setting is “Enabled” but the corresponding
RRTD 1 APPLI-
CATION
setting is
“
None
”
.
If the RRTD communication link with the T60 is broken, then the last temperature actual values are retained until the RRTD
communication failure is detected. When this occurs, a RRTD COMM FAILURE self-test alarm and target message is gen-
erated, and an event is logged in the event recorder and the temperature actual values reset to 0. When the link is re-estab-
lished, the
RRTD 1 APPLICATION
and
RRTD 1 TYPE
settings are read from the RRTD to re-synchronize the device.
• RRTD 1 FUNCTION : This setting enables and disables the remote RTD. If set to “Disabled”, no actual value is created
for the remote RTD.
• RRTD 1 ID : This setting is used to assign alphanumeric ID is assigned to the remote RTD. This ID will be included in
the remote RTD actual values. It is also used to reference the remote RTD input to features using the remote RTD.
• RRTD 1 TYPE : This setting specifies the remote RTD type. Four different RTD types are available: 100
Ω
Nickel, 10
Ω
Copper, 100 Ω Platinum, and 120 Ω Nickel.
The RRTD converts resistance to temperature as per the values in the following table. The T60 reads the RTD temper-
atures from the RRTD once every five seconds and applies protection accordingly. The RRTDs can be used to provide
RTD bias in the existing thermal model.
An RRTD open condition is detected when actual RRTD resistance is greater than 1000 ohms and RRTD open is dis-
played as “250°C” in the T60.
Table 5–39: RTD TEMPERATURE VS. RESISTANCE
TEMPERATURE RESISTANCE (IN OHMS)
°C °F 100 OHM PT
(DIN 43760)
120 OHM NI 100 OHM NI 10 OHM CU
–40 –40 84.27 92.76 79.13 7.49
–30 –22 88.22 99.41 84.15 7.88
–20 –4 92.16 106.15 89.23 8.26
–10 14 96.09 113 94.58 8.65
0 32 100 120 100 9.04
10 50 103.9 127.17 105.6 9.42
20 68 107.79 134.52 111.2 9.81
30 86 111.67 142.06 117.1 10.19
40 104 115.54 149.79 123 10.58
50 122 119.39 157.74 129.1 10.97
60 140 123.24 165.9 135.3 11.35
70 158 127.07 174.25 141.7 11.74
80 176 130.89 182.84 148.3 12.12
90 194 134.7 191.64 154.9 12.51
100 212 138.5 200.64 161.8 12.9
110 230 142.29 209.85 168.8 13.28
120 248 146.06 219.29 176 13.67
130 266 149.82 228.96 183.3 14.06
140 284 153.58 238.85 190.9 14.44
150 302 157.32 248.95 198.7 14.83
160 320 161.04 259.3 206.6 15.22
170 338 164.76 269.91 214.8 15.61
180 356 168.47 280.77 223.2 16
190 374 172.46 291.96 231.6 16.39
200 392 175.84 303.46 240 16.78