Summary
Today many online oil monitoring systems are available on the market, covering a huge range from low cost single-parameter detection systems up to costly multi-parameter analysers. Therefore, it needs to be decided case by case which system fits best to specific technical and economical requirements, which is often not a straightforward task, because various economical and technical aspects need to be considered. Therefore extensive investigations have been performed on different fluids in order to verify, which parameters need to be determined in which accuracy by a technical and economical reasonable online oil monitoring system. For these investigations diverse common faults have been simulated in a conventional insulating liquid. For each fault mode, the key gases have been determined, thus based on a key-gas evaluation the minimum number and accuracy of parameters could be defined, which are needed in order to identify the failure unambiguously. For the investigations the oil parameters have been determined using a high precision laboratory measurement equipment, and simultaneously a 3-parameter-detection online system has been used, in order to verify the potential of such online monitoring systems to detect malfunction of insulation systems inside power transformers. The performed investigations show that online oil monitoring systems have in general the capability to identify different failures in power transformers, thus measures can be initiated in time in order to prevent a breakdown. Based on the results described in this contribution it is possible to decide, which oil online monitoring system should be chosen under specific technical and economical requirements. Furthermore the results lead to a recommendation, which oil parameters should be detected and evaluated by an economically optimized online monitoring system.
Additional informations
| Publication type | ISH Collection |
|---|---|
| Reference | ISH2017_363 |
| Publication year | |
| Publisher | ISH |
| File size | 393 KB |
| Pages number | 6 |
| Price for non member | Free |
| Price for member | Free |
Keywords
Power Transformers, online monitoring, DGA, moisture content, IEC 60599, IEEE C57.104
