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۱RECENT ADVANCES IN THE CONDITION MONITORING AND ASSESSMENT OF POWER TRANSFORMERS
نویسنده(ها): ،
اطلاعات انتشار: پانزدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۷
With ever increasing pressure on resources, achieving a safe and reliable power supply as efficiently and costeffectively as possible is a major goal for any organisation operating electricity transmission or distribution networks. Power transformers are normally very reliable items of electrical equipment, but when faults occur they can develop catastrophically, resulting in the loss of what is usually the most expensive item in the substation, with the likelihood of high forced outage costs and also possible collateral damage from any fire or explosion. Clearly then, despite' the generally good reliability of transformers, in view of the potentially serious consequences of failures it is important that effective condition monitoring techniques are employed so that faults can be detected at an early stage so as to improve the prospects for repairs and minimise the impact of any failures. A particular problem with transformers is that internal visual inspections are very expensive because of the oil handling required and are also often inconclusive because very little of the active part of the unit is accessible for inspection. Therefore condition monitoring of transformers has to be based on non–invasive techniques, which have to be sophisticated enough to take into account the complicated constructional aspects.
In addition to the basic need to detect faults at an early stage, there is increasing pressure for monitoring techniques that enable maintenance to be postponed, or a suspect unit to be left in service. There is also an increasing need for techniques to enable the condition of transformers to be assessed, in particular to determine the aged state of the equipment, to provide information on which
to base asset management decisions over the long term.<\div>

۲How to deal with gassing transformers
نویسنده(ها): ، ،
اطلاعات انتشار: شانزدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۱
Power transformers are generally reliable constituents of a transmission or distribution network. However, the cost of a transformer failure can be very high, not just the price of a new transformer but also the costs incurred by a forced outage and loss of security to the system. It is certainly, therefore, in the asset owner’s interest to take an informed interest in their condition. Condition assessment and monitoring techniques have received a technological boost in the last few years but at the heart of it is a technique dating back several decades. Dissolved gas analysis (DGA) is still the best technique for detecting abnormalities in transformers. The sampling of oil and subsequent analysis for dissolved gases is well defined in IEC60567 (1). The interpretation of the results is less straightforward; there are recognised standards (2,3) and other publications (4,5). Whilst they<\div>
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