An innovative online drying procedure for liquid insulated high voltage apparatus

authored by

V. Wasserberg, H. Borsi, Ernst Gockenbach

Abstract

Although solid and gaseous insulations have become increasingly important during the last decades the application of insulating liquids together with cellulosic paper is still essential for some kinds of applications like power transformers. A dominant risk, reducing the strength of such insulations, is water, thus drying procedures are required to extend lifetime and operation reliability. Actually transformer drying is in most cases performed as a maintenance action where it is tried to remove water by vacuum and heat. Such a procedure has to be performed offline and also comprises the risk of insulation endangerment. Such disadvantages can be avoided by an online drying procedure which is not only valuable for aged insulations where it increases the residual lifetime but also for new devices where it reduces the risk of early outages. In this contribution an innovative procedure for the dehydration of mineral insulating oils is presented, working online during transformer operation. This procedure not only performs a complete desiccation, it also purifies the liquid without influencing the dissolved gas analysis (DGA) or any other physical property. Herewith presented investigations on the operation parameters like temperature and flow rate have shown, that the procedure is beneficial for insulating liquids as well as for solid insulations immersed therein.

Organisation(s)

High Voltage Engineering and Asset Management Section (Schering Institute)

Type

Conference contribution

Pages

587-590

No. of pages

4

Publication date

2001

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Engineering, General Materials Science

Electronic version(s)

https://doi.org/10.1109/ISEIM.2001.973737 (Access: Closed)