![]() ![]() At present, all load current flowing through the main contact U and there is no load in Main contact V. Due to the high resistive path of X, the resistive path is automatically bypassed.Īt this point, we need to change OLTC tap position from Tap-2 to Tap-3. The load current flows through the OLTC selector contact U. In the connection diagram of Fig-I, OLTC tap position is connected to the Tap-2. The following connection diagram of OLTC, it is explained the working principle of OLTC in Transformer. A resister unit is used in parallel with the main tap to avoid discontinuity during the changeover of the tap position. The diverter switch is filled with transformer oil and a separate conservatory is used for it.ĭuring changing of the tap from one tap position to another position, the neutral or phase connection can be discontinued for a moment. The diverter switch is a separate housing inside the transformer. OLTC consists of two separate sections, they are Diverter switch and Tap selection. Working Principle & connection diagram of OLTC or On-Load Tap Changer Variation of Transformer output voltage is also required for better stability of Transmission and distribution power grid. ![]() Grid Stability: The voltage of the power system also varies due to various reasons like long length transmission lines, use of FSC, and reactors in substations.For using Capacitive loads like capacitor banks, Synchronous motor, Buried cable, Radio circuits,s etc., the output voltage increased. Due to using of higher inductive load like Motor, Fan, Pump, Chocks, relay, contactors, etc., the output voltage dropped. ![]()
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