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 On tank – UZE/UZF |
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The UZ types of on-load tap-changers are of the single compartment on-tank type. The selector and switching mechanisms are combined (selector switch) and are located in the main compartment, with the motor-drive mechanism welded to the outside. The unit is supplied ready to mount on the outside of the transformer tank. |
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In tank – UBB/UC |
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When the on-load tap-changer operates, arcing occurs in the tap-changer. To avoid contamination of the transformer oil, the tap-changer is housed in its own oil compartment separated from the transformer oil. All components that make or break the current during the operation of the tap-changer are located in the tapchanger compartment. The UB range of on-load tapchangers operates according to the selector switch principle, that is, the tap selector and diverter switch functions are combined in one. The UB type of on-load tap-changer is mounted on the inside of the transformer tank. Both cover-mounting and yoke-mounting may be specified. The tap-changer comes ready for mounting on the inside of the transformer tank, which simplifies installation procedures. All of the equipment necessary to operate the tapchanger is contained in a cylinder of glass fibre reinforced plastic, the selector switch housing. Driving is from a separate motor-drive mechanism, fitted to the side of the transformer tank, and connected by means of drive shafts and bevel gears. | |
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When the on-load tap-changer operates, arcing occurs in the diverter switch. To avoid contamination of the transformer oil, the diverter switch has its own housing separate from the rest of the transformer. The tap selector, which is mounted beneath the diverter switch housing, consists of the fine tap selector and usually also of a change-over selector. The operating principle for the UC range of on-load tap-changers is called the diverter switch principle. The UC types of on-load tap-changers are usually mounted inside of the transformer tank, suspended from the transformer cover. Drive to operate the on-load tapchanger is supplied from the motor-drive mechanism, which is mounted on the outside of the transformer tank away from the on-load tap-changer. The drive is transmitted by means of shafts and bevel gears. The UC types of on-load tap-changers come in a wide range of models with a rating suitable for every application. |
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