If a DETC is not exercised on a regular basis, there is increased risk that the switch contacts will not make properly when next moved. The de-energized or off-load tap changer is normally mounted on the main transformer tank and is set to match the high voltage network supplying the transformer. Adjustments on a DETC are typically only made for seasonal weather changes and require an electrical outage. Photo: EATON.Īs the de-energized name implies, these voltage adjustments can only be made when the transformer windings are isolated because the switch is not designed or rated to interrupt high voltage electrical loads. Transformer De-energized Tap Changer Switch Example. Transformer De-energized Tap Changer Switch Example 702×650 47.1 KB This switch allows operators to change the number of turns in the high voltage winding based on the connected system input. Many electrical transformers are equipped with a manually operated tap changer switch on the high voltage winding known as a DETC or de-energized tap changer. Tap changer switches provide an external means to accomplish this voltage adjustment. The easiest way to change the output of a transformer is by either changing its input voltage or by changing the number of turns in the windings. Each phase of a transformer is composed of two separate coil windings wound on a common core. Transformers efficiently transfer electrical energy from one circuit to another by means of magnetic induction. As a result, transformers must adapt to rapidly changing conditions on power grids by regulating their voltage output. Transformer Tap Changers: Basic Principles and Testing Explained 978×600 110 KBĮlectrical energy is unique in that it must constantly be produced at a rate that meets instantaneous demand.
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