What is the function of on load tap changer?

The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. There are two types of transformer tap changers: an on-load tap changer (OLTC) and a deenergised tap changer (DETC).

What happens when off-load tap changer operated on load?

In case of Off-Load Tap Changer, it must be ensured that Transformer is de-energized as Off-Load Tap Changing is not Make Before Break type. If the Off-Load Tap Changer is used while the Transformer is energized, heavy sparking will take place which will damage the winding and insulation.

What is the difference between on load tap changer and off-load tap changer?

Unlike in on-load tap changing where the arc quenching is limited by oil when the transformer is on-load, the tapping with an off-load tap changer is only carried out when the transformer is in OFF-Switch condition.

Why OLTCs on load tap changer are used?

On-load tap-changers (OLTCs) are indispensable in regulating power transformers used in electrical en- ergy networks and industrial applications. OLTCs enable voltage regulation and/or phase shifting by varying the transformer ratio under load without interruption.

What is the need of tap?

Tap, a screwlike tool that has threads like a bolt and two, three, or four longitudinal flutes or grooves and that is used to cut screw threads in a nut or a hole.

On which side the tap changer is usually located and why?

On load tap changer is preferred on High Voltage Side: Mostly the power transformer is used for both step up and step down action. In that, the power transformer’s turns are in the high voltage side is higher than the low voltage side.

How does a no load tap changer work?

No-load tap changers (NLTC), also known as de-energized tap changers (DETC), off-load tap changers, and, off-circuit tap changers (OCTC), employ manually operated switching equipment that changes the transformer turns ratio of the three phases simultaneously and by the same amount.

How is tap changing achieved?

Tap changing may be achieved by three conditions. Explanation: Tapping can be done to either primary or secondary sides. The taps may be placed on the primary or secondary side which depends on construction. Tapping is thus so useful for various applications.

What are the disadvantages of tap changing transformers?

However, its major disadvantage is that although two thyristor are ON over short periods during the tap-changing process, it is permanently connected to the circuit of the deviation switches and it probably gets burnt. This may therefore reduce the reliability of the system.

In which up the tap changing transformer is used?

Off load tap changing is normally provided in low power, low voltage transformers. It is the cheapest method of tap changing. The tap changing is done manually though hand wheel provided in the cover. In some transformers arrangements to change the taps by simply operating the mechanical switches are also provided.

What is the function of the tap and tap wrench?

A tap wrench is a hand tool used to turn taps or other small tools, such as hand reamers and screw extractors.

What is the function of on load tap changer? The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. There are two types of transformer tap changers: an on-load…