On Load Tap Changer OLTC in Transformer: Everything you need to know about Transformer on-load tap changer in Substation
This is your One-stop Guide on On-Load Tap Changer (OLTC) in Power Transformer. It Includes Construction, Working & Advantages of OLTC.
What is Tapchanger?
Tap Changer is used to adjust the Secondary Voltage of Transformers by changing the Turns Ratio of the Transformer.
Why is Tapchanger provided to HV Winding of the Transformer?
Ans: 1) Higher Number of turns in HV Winding facilitates better voltage variation and fine voltage regulation.
2) It is uneconomical to interrupt High Current on the LV Side.
3) LV Winding is nearer to the core and HV Winding on the Outer side, it’s easier to take tapings from the HV Winding.
What is OLTC in Power Transformer ?
On Load Tap Changers (OLTC) are used in power transformers to regulate the Output voltage of the transformer, so as to match the changing load conditions in the network., to the levels set by the power grid.This is done by altering the transformation ratio of a transformer by varying its winding turns ratio, either Manually or Automatically.
It is either manually or automatically operated to OLTCs to provide the transformer with the flexibility to adapt to different voltage requirements, and can help to reduce energy losses and increase energy efficiency. OLTCs are especially useful in large power transformers, as they can help to lower the cost of energy by ensuring optimal voltage levels.
What are the Types of OLTC?
On Load Tap Changers (OLTC) are used in power transformers to regulate the voltage output of the transformer to the levels set by the power grid. There are two main types of OLTC available: single-phase and three-phase. Single-phase OLTCs are more suitable for small to medium-sized transformers, while three-phase OLTCs are better suited for larger transformers.
What are the Functions of OLTC?
The OLTC has three main functions: adjusting the voltage, regulating the load, and providing protection of the transformer.
The OLTC is responsible for adjusting the voltage of the transformer. This is done by connecting the transformer winding to taps on the secondary side of the transformer, allowing the voltage to be shifted up or down depending on the needs of the system.
The OLTC also regulates the load on the transformer. By connecting the transformer winding to various taps, the OLTC is able to control the amount of current that flows through the transformer, allowing the transformer to be in balance and operate efficiently.
Lastly, the OLTC provides protection of the transformer by detecting any imbalances in the load, and disconnecting the transformer if necessary. This ensures the transformer and its components are protected from damage.
What are the Advantages of using OLTC ?
- Improved energy efficiency: OLTCs allow for precise control of the voltage of the transformer, which helps it to operate more efficiently, thereby reducing energy losses.
- Improved safety: By controlling the voltage of the transformer, OLTCs help to keep the voltage steady and within acceptable limits, thereby reducing the risk of an overload and potential fire.
- Reduced maintenance: Since OLTCs help to reduce the frequency of maintenance, they help to reduce the overall cost and time associated with maintaining the transformer.
- Reduced downtime: The precise control of the voltage helps to reduce the downtime of the transformer, which helps to reduce overall costs.
How is the Maintenance of OLTC carried out?
electrical components. Additionally, preventive maintenance should be performed at regular intervals in order to detect any potential problems. By taking the necessary steps to maintain your OLTCs, you can extend the life of your transformers and ensure their continued profitability.
Explain the OLTC Working ?
On Load Tap Changer, OLTC is the Make Before Break type which ensures that no sparking will take place while operating OLTC. During the operation of On Load Tap Changer, OLTC following two things shall be taken care:
- The main circuit shall not be opened else heavy sparking will take place.
- No part of tapped winding shall be shorted.