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Tap Changers Are Divided Into Two Types On-Load (OLTC) and Off-Load/de

Tap changers come in two types: on-load (OLTC) which allows changing the ratio while the transformer is energized, and off-load/de-energized (DECT) which requires the transformer to be de-energized for a ratio change. Vector groups categorize transformer winding configurations using IEC notation, denoting high voltage and low voltage winding types and phase shift between them, such as a wye HV winding and delta LV winding with a 30-degree lead denoted as Yd11.

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70 views1 page

Tap Changers Are Divided Into Two Types On-Load (OLTC) and Off-Load/de

Tap changers come in two types: on-load (OLTC) which allows changing the ratio while the transformer is energized, and off-load/de-energized (DECT) which requires the transformer to be de-energized for a ratio change. Vector groups categorize transformer winding configurations using IEC notation, denoting high voltage and low voltage winding types and phase shift between them, such as a wye HV winding and delta LV winding with a 30-degree lead denoted as Yd11.

Uploaded by

abbutalibb
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Tap changers are divided into two types; On-load (OLTC) and Off-load/de-

energized (DECT). The OLTC allows selection of ratio change while


thetransformer is in service. This means that the ratio of a transformer can be
changed while power (current) is still passing through it.

In electrical engineering, a vector group is the International Electrotechnical


Commission (IEC) method of categorizing the high voltage (HV) windings and low
voltage (LV) winding configurations of three-phase transformers. ... For example, a wye
HV winding and delta LV winding with a 30-degree lead is denoted as Yd11.

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