What is on load tap changer in transformer?
What is on load tap changer in transformer?
The purpose of a tap changer is to regulate the output voltage of a transformer by altering the number of turns in one winding and thereby changing the turns ratio of the transformer.
Do auto transformers have tap changers?
In autotransformers, tap-changers are connected on either the HV winding or the LV winding.
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.
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 does on load tap changing transformer do?
Definition: An On-Load Tap Changing Transformer (OLTC) consists of an open load tap changer, it is also known as an on-circuit tap changer (OCTC). They are used in areas where there is an interruption in the power supply due to an unacceptable tap change. The ratio of the number of turns can be changed without breaking the circuit.
How does on load tap changer work?
On-load tap changers (or circuit tap changers), as the name suggests, permit tap changing and hence voltage regulation with the transformer on-load. Tap changing is usually done on the HV winding for two reasons: Because the currents are lower, the tap changer contacts, leads, etc., can be smaller.
What is a no load tap changer?
No-load tap changer. No-load tap changer (NLTC), also known as Off-circuit tap changer (OCTC) or De-energized tap changer (DETC), is a tap changer utilized in situations in which a transformer’s turn ratio does not require frequent changing and it is permissible to de-energize the transformer system.
What is transformer tap changing?
A tap changer is a mechanism in transformers which allows for variable turn ratios to be selected in distinct steps . This is done by connecting to a number of access points known as taps along either the primary or secondary winding.