MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1 4-Mar-22 Page 13 of 99
5 TRANSFORMER MONITORING SYSTEM (TMS)
A fully integrated TMS is illustrated in Figure 5-1. In addition to the analytics performed
on dissolved gases, the DGA 900 Plus accepts multiple inputs from an array of sensors.
Figure 5-1: TMS inputs overview
These sensors gather operational data on the internal workings of a transformer that
allow the DGA 900 Plus to:
▪ produce thermal models on key aspects of a transformer’s condition
▪ monitor and model the cooling status of fans and pumps
▪ monitor the condition of the OLTC mechanism
▪ monitor 3/6 bushings
These capabilities are delivered by several TMS option packs that are installed in the Hub
module and are field retrofittable. Each pack has dedicated PCB card options and are
supplied with the relevant sensors (unless otherwise stated). These cards receive the
sensor data and process it according to advanced algorithms. Some interdependencies
do exist between the various cards with some inputs and outputs feeding into other
models as illustrated by the relationship schematic shown in Figure 5-2.
Note: Consult with your GE representative to ensure that the correct option pack(s)
are part of your installation.
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