MA-041
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DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1
4-Mar-22
Page 18 of 99
Figure 6-1: Thermal Models wiring
Figure 6-2 to Figure 6-4 below show the temperature sensors and CT in detail.
6.3
Temperature Sensors
The temperature sensors measure the top and bottom oil temperatures of the main tank
and the OLTC temperature. An example is shown in Figure 6-1 and comprises of a self-
contained PT100 with a built-in 4-20 mA transmitter which is powered from the
monitoring unit and provides a 4-20 mA output that is read by the analogue input card.
The temperature sensor is enclosed in a plastic weatherproof housing and magnetically
mounts to the side wall of the transformer main tank or the OLTC side wall.
