Tap Changers For Electric Transformers

Tap Changers For Electric Transformers

Tap changers for electric transformers are devices that allow the adjustment of the turns ratio of the transformer by changing the position of the tap on the winding. This is achieved by connecting the winding to a series of taps, which are located at different points along the winding. The tap changer can be operated manually or automatically, depending on the design of the transformer and the requirements of the application. The main purpose of tap changers is to maintain the output voltage of the transformer at a constant level, even when the input voltage fluctuates. This is important because many electrical devices are sensitive to changes in voltage, and a stable voltage supply is essential for their proper operation. By adjusting the turns ratio, the tap changer can compensate for changes in the input voltage and maintain a constant output voltage. There are two main types of tap changers: on-load tap changers (OLTC) and off-circuit tap changers (OCTC). On-load tap changers allow the tap to be changed while the transformer is energized, which is useful for applications where a continuous power supply is required. Off-circuit tap changers, on the other hand, require the transformer to be de-energized before the tap can be changed. This is a slower process, but it is safer and more reliable. Tap changers are commonly used in power distribution systems, where they are used to regulate the voltage of the power supply. They are also used in industrial applications, such as motor control and lighting systems, where a stable voltage supply is essential for proper operation.

transformer, turns ratio, voltage regulation, on-load tap changer, off-circuit tap changer

— Christopher White