What is on load tap changing transformer?
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.
Why tap changing is generally performed on load and how?
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. As the HV winding is wound outside the LV winding, it is easier to get the tapping connections out to the tap changer.
Why are the tap changing transformer required explain the operation of no load tap changing transformer?
In order to maintain a constant voltage or to maintain within the prescribed limits transformer tap-changing is used. In tap-changing, the tappings on the coils of the transformer are placed so that by varying the turn-ratio voltage induced can be varied.
What voltage of on load tap changer is required for unit transformer?
On-load tap-changer is controlled by CBM IED (110 kV) or on-load tap-changer control IED (220 kV), (6) The on-load tap-changer control is implemented via the logical node ATCC.
On which side of transformer tap changer is provided?
high voltage side
The tap changer is placed on high voltage side because: 1. The HV winding generally wound over LV winding hence it is easier to access the HV winding turns instead of LV winding.
What is tap changing transformer What is the main purpose of providing tap in transformer?
A tap changer is a mechanism in transformers which allows for variable turn ratios to be selected in distinct steps. The tap selection on any tap changer may be made via an automatic system, as is often the case for OLTC, or a manual tap changer, which is more common for NLTC.
How do you tap Change transformers?
Tap changing in Transformers This can be done by changing the transformer turns ratio. The taps are leads or connections provided at various points on the winding. The turns ratio differ from one tap to another and hence different voltages can be obtained at each tap.
What does on load tap changing transformer do?
what is a tap changer
What is the effect of load on transformer?
– Copper Loss – Hysteresis loss – Eddy current Loss – Leakage flux in primary and secondary winding. – Magnetization current (Not loss but needed to produce flux)
Why is tap changer used in transformer?
The tap changer of the transformer performs this task to change the turn’s ratio. The tap changer basic function is that it removes or connects some portion of the winding to the load side or source side. Tap changer can be located on primary side or secondary side. However it will be placed on high voltage winding side.
What is off load tap changer?
Off-load tap changers for transformers (DETC) are used to change the transmission ratio in order to adjust the transformer to grid conditions. Therefore tap changer for transformers have several pins to connect with the coil windings.