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Tap-changer overhaul and upgrade

Proper Load and/or On-Load Tap-Changer (LTC / OLTC) maintenance has become increasingly complex even for the best utility and industrial managers. Factors resulting from interconnections and power networks to aging equipment and the declining pool of technical experts add to the challenge.

Tap-changers are very important components in transformers and the power grid. As they are of mechanical construction, they cause concern due to their maintenance needs and their failure probability. It is therefore important to be able to assure the integrity of tap-changers as cost effective and reliably as possible. Moreover, reports from international studies made by for example CIGRE shows that faults associated to tap-changers are the origin of up to one third of the transformer failures in service.

When you evaluate the liability of a single tap changer failure at today’s costs, establishing an effective maintenance strategy becomes a matter no one can ignore. Hitachi Energy offers a comprehensive and systematic approach to effectively maintain many manufacturers’ tap changers, including Hitachi Energy, Westinghouse, Reinhausen, Moloney, GE, National Industri and others. Our tap changer maintenance package can supplement existing in-house programs or work independently to satisfy the total maintenance need.

TXLife – Tap Changer service packages

Our tap changer service packages include required inspection and testing to accurately determine the condition of your tap changer, maintaining the drive system and replacing contacts as required. Following recommended factory test protocols and fully supported by factory experts, our local trained service teams can fully maintain your tap changer with factory supplied parts to ensure long-term safe and reliable operation. 

Tap Changer monitoring

Our tap-changer services increase transformer life, reliability, and lower overall maintenance and operating costs. In order to further assist our customers, Hitachi Energy offers a wide range of monitoring and diagnostic tools from the simple way to monitor the temperature difference between the LTC/OLTC and the transformer main tank up to the most advanced solutions on the market for example CoreTec. This will allow more refined diagnosis of LTC/OLTC problems to predict maintenance/overhaul needs based on actual condition and not on the number of switching operations.

Tap Changer retrofit

In order to further lower the maintenance and operating cost, Hitachi Energy have introduced plug-and-play concept. This means the possibility to upgrade an old oil-breaking tap changers type UCG, UCL, UCB, UCC and UCD to vacuum technology. A work that is as easy as a normal maintenance.

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