Tap Changers Overview | Some Considerations of Location of LTC
There are two different tap changes that can be used to change transformer voltage. These are de-energized tap changers (DETC) and load tap changers (LTC). Transformers must be de-energized first before operating the DETC. LTCs can change the taps while the transformer is online without interrupting load. There are cases where the transformer could be operating at variable flux. Flux affects multiple things such as impedance, sound level, core losses, etc. These situations could arise when the LTC is located on the primary (high voltage) side while regulating the low voltage side.
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