AUTOMATIC FILTER RE-DRYING
A key advantage of the Trojan is the automatic Filter Re-Drying. The water removal filters only require changing every 18 months. The Filters are large capacity and have a high attraction to water, and will consistently remove water to under 2 ppm. The filters can be Re-Dried hundreds of times without any effect on performance, allowing a large number of transformers to be dried without the need for Filter replacement. This significantly reduces the cost per litre of water removed compared to other adsorbent systems.
The water removed during the Re-Dry process cannot re-enter the transformer. At the end of the Filter Re-Dry, the Trojan checks the hoses and pipe work of any bubbles before re-starting Filtering for the hours entered, to collect more water. These cycles of Filtering and Filter Re-Dry continue until the Trojan is stopped.
As filtering progresses, the transformer oil and insulation cellulose become dryer. The Trojan compensates by drying the Filter to even lower levels, which ensures that no matter how low the water in the oil ppm value, the Trojan will always remove water. The Filters will always be dryer than the water level in the transformer.
Fig.1 is an example of three 20 hour Filtering periods and two Filter Re-Dry cycles. Although the Filters gradually become near saturated (indicated by the Filter outlet ppm), water removal efficiency is restored following the Re-Dry and the improved is evident.
We are happy to provide comparative water removal costs to other adsorbent systems.
