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figure 8-14 LV Bushing
8.7 Off-Load Tap Changer
The tap changer is a device that allows making windings adjustments to compensate
deviations in nominal voltage.
The tap changer operation could be made with hot-line tool or using the operation handle.
To operate the tap changer, you must follow the next instructions:
1. De-energize the Transformer and prove that there is not voltage in low and high voltage
bushings.
2. Remove the screw which is used to lock the operation handle.
3. Attach the hot line tool to handle eye tap changer.
4. Place the handle in the desired position. To increase the voltage in the low voltage
terminal it is required to rotate it in clockwise.
5. Replace the screw to lock the operation handle.
6. Once finished the above mentioned, proceeds to energize the transformer.
7. Finally, it should be verified that the voltage value is inside of the design values indicated
in the nameplate, typically +/-5% about the nominal value. Superior values can generate
transformer over-heating, increment the noise level, or a bad operation of the equipment
that the transformer feeds.
Never try to put the tap changer in intermediate positions or any other position that is not
clearly indicated in the nameplate.
8 Components and Accessories User Manual
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