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Replacing an on-load tap-charger

Reinhausen Asia-Pacific (RAP) has assumed the role of general contractor again. On request of Northern Utilities Resources (NUR), the company replaced an on-load tap-changer from Chang Zheng Electric Apparatus Works with a Vacutap VM.

(Photo: RAP)

AS THE GENERAL CONTRACTOR, RAP WAS RESPONSIBLE not only for the delivery and installation, but also for the entire project management. The project team, led by project managers Looi Peng Yong and Rosidi Mat Lazim, carried out the planning and technical preliminary work in advance in order to keep downtime to a minimum. This enabled the transition to the Vacutap VM with the motor-drive unit Tapmotion ED.

The replacement was carried out in accordance with the requirements and safety standards prescribed by NUR. NUR is a private utility, which provides power for the high-tech locations in the north of the Malaysian peninsula. The transformer was reconnected to the grid in ten days, following replacement and successful final testing, and the project was also completed within the stipulated budget.

The MR voltage regulator MK30 AVR (Photo: RAP)

An MK30 AVR type MR voltage regulator was already installed on the old tap changer and had worked reliably for more than 17 years. Now it was time to replace the old regulator with the Tapcon 230. An MK30 AVR was also connected to a second transformer. The RAP service specialists suggested upgrading both AMK30s and the parallel control unit SKS30 with two Tapcon 230s. By using the Tapcon 230, an additional parallel control unit would no longer be necessary. Its housing is the same size as the MK30 and can therefore be easily interchanged.

The MR voltage regulator MK30 AVR (Photo: RAP)

The most important requirement of NUR was for the second transformer to immediately switch up one step when the master transformer switches up one step (the same applies when switching down). All they needed to do was set up a CAN connection between the two Tapcon 230s to allow data to be transferred ("Master Follower" function).One of the challenges was the wiring scheme of the existing installation in regard to the current-transformer connection. That is why the service technicians decided to switch off only one transformer at a time during retrofitting. After many hours of planning and consultation, the work was carried out on 20 March 2014. Commissioning took place following routine tests. Both Tapcon 230s were then monitored for a day and no problems were found.

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