Low voltage at transformers, Electrical Engineering

Low Voltage at Transformers

While the voltage applied to induction motor varies from the rated voltage, its performance is affected. Against permissible voltage variation of ± 6%, in practice, the supply voltage varies through more than 10% in several distribution systems. A decreased voltage in the case of an induction motor results in higher currents drawn for the similar output. For a voltage drop of 10%, the full load current drew through the induction motors increases through about 10% to 15%, the starting torque decreases through nearly 19% and the line loss in the distributor increases by about 20%. As the bulk load of rural areas and little scale industrial areas consists of induction motors, the line losses within the concerned distribution systems might even touch 20%.

The above situation is corrected through operating an "on-toad-tap changing" in the power transformer situated at high voltage substations, 66/11 kV and 33/11 kV substations and giving on the 11 kV feeders, a merge of switched capacitors and automatic voltage regulators. In addition, if the off- load tap changing gear is available, a "off load tap changing" in distribution transformers is adjusted prior to the commencement of agricultural load season. This is readjusted before the on-set of monsoons while the rural load is small.

Posted Date: 2/6/2013 5:39:47 AM | Location : United States

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