The selector type on-load tap changer combines the diverter switch and tap selector into one simple switch. The system consists of one fixed and one moving contact unit. Each fixed contact has two contact paths on each side, one for the main moving contact and another for the switching contacts. The drive system can be built as one rigid unit rotated by a common drive shaft. This system is for on-tank , and intank tap changers. The Type motor drive comes as an integral part of the on-tank type tap changer and requires no additional transformer wall space. This allows for quick and easy installation while lowering the cost for field service.
Active component construction can be either of the diverter or selector type switching principle. The diverter type is built of two separate sections with the diverter part having its own compartment while the tap-selector shares oil with the transformer. The tap-selector is mounted below the diverter switch housing and has two moving arms with one carrying the current and the other free to pre-select the next tap position.
The diverter switch moves from left to right and transfers current to the other tap position (selector
pre-selection) via the transition resistors. All arcing takes place from within the diverter compartment.The complete unit is suspended from the transformer tank cover, and this system for its in-tank Type tap changer.
awesumm.... good answer
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