On Load Tap Changer

On-load tap changers (LTC, or, OLTC) regulate the turns ratio and thus the voltage ratio of an electrical transformer. Unlike its no-load counterpart, on-load tap changers do this without interrupting the load current. There are two main load tap changer designs, the reactance and the resistive types. Load tap changers are often employed with conservator type transformers, but seldom with hermetic transformers


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