GE T60 Instruction Manual page 597

CHAPTER 5: SETTINGS
An RRTD actual value of –43°C implies that the
setting is "None."
APPLICATION
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
generated, an event is logged in the event recorder, and the temperature actual values are reset to 0. When the link is re-
established, the
RRTD 1 APPLICATION
— This setting enables and disables the remote RTD. When disabled, no actual value is created for the
RRTD 1 FUNCTION
remote RTD.
— Assign an alphanumeric ID to the remote RTD. This ID is included in the remote RTD actual values. It is also used
RRTD 1 ID
to reference the remote RTD input to features using the remote RTD.
— This setting specifies the remote RTD type. Four different RTD types are available: 100 Ω Nickel, 10 Ω Copper,
RRTD 1 TYPE
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 temperatures
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.
Table 5-46: RTD temperature vs resistance
Temperature Resistance (in ohms)
°C °F 100 ohm Pt
(DIN 43760)
–40 –40 84.27
–30 –22 88.22
–20 –4 92.16
–10 14 96.09
0 32 100
10 50 103.9
20 68 107.79
30 86 111.67
40 104 115.54
50 122 119.39
60 140 123.24
70 158 127.07
80 176 130.89
90 194 134.7
100 212 138.5
110 230 142.29
120 248 146.06
130 266 149.82
140 284 153.58
150 302 157.32
160 320 161.04
170 338 164.76
180 356 168.47
190 374 172.46
200 392 175.84
An RRTD open condition is detected when actual RRTD resistance is greater than 1000 ohms and RRTD open is displayed
as "250°C" in the T60.
An RRTD short condition is detected when actual RRTD temperature is less than –40°C and RRTD short is displayed as is "–
50°C" in the T60.
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
setting is "Enabled" but the corresponding
RRTD 1 FUNCTION
and settings are read from the RRTD to re-synchronize the device.
RRTD 1 TYPE
120 ohm Ni 100 ohm Ni
92.76 79.13
99.41 84.15
106.15 89.23
113 94.58
120 100
127.17 105.6
134.52 111.2
142.06 117.1
149.79 123
157.74 129.1
165.9 135.3
174.25 141.7
182.84 148.3
191.64 154.9
200.64 161.8
209.85 168.8
219.29 176
228.96 183.3
238.85 190.9
248.95 198.7
259.3 206.6
269.91 214.8
280.77 223.2
291.96 231.6
303.46 240
TRANSDUCER INPUTS/OUTPUTS
RRTD 1
10 ohm Cu
7.49
7.88
8.26
8.65
9.04
9.42
9.81
10.19
10.58
10.97
11.35
11.74
12.12
12.51
12.9
13.28
13.67
14.06
14.44
14.83
15.22
15.61
16
16.39
16.78
5
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