In this article, you will discover How does an OLTC work?, Which side is OLTC connected in transformer?, How does a tap changer regulate voltage?
How does an OLTC work?
An on-load tap changer (OLTC) operates by adjusting the number of turns in the transformer winding while the transformer is energized or loaded. It generally consists of a diverter switch mechanism and a tapping selector which allows the transformer winding to be connected at different tap positions. When the OLTC is activated, the diverter switch redirects current flow from the existing tap to the selected tap, thereby changing the turn ratio of the transformer and adjusting the output voltage.
Which side is OLTC connected in transformer?
The OLTC is usually connected to the high voltage winding of the transformer. This allows it to adjust the voltage output of the transformer by changing the number of turns in the winding while maintaining a constant primary voltage level. By varying the position of the tap, the OLTC can compensate for changes in load or incoming voltage to ensure that the desired output voltage level is maintained within acceptable limits.
How does a tap changer regulate voltage?
A tap changer, including OLTCs, regulates voltage by adjusting the number of turns in the transformer winding, thereby changing the transformer turns ratio and output voltage level. By selecting different TAP positions, the tap changer can compensate for variations in load, incoming voltage, or other factors that affect transformer voltage regulation. This allows the tap changer to maintain a stable output voltage within specified limits, ensuring the proper operation of the electrical equipment connected to the transformer.
While OLTCs offer several advantages, such as improved voltage regulation and flexibility to adjust the transformer output voltage, they also have disadvantages. A disadvantage is the complexity of the mechanism, which can increase the cost of the transformer and require additional maintenance. Additionally, OLTCs introduce additional electrical connections and components that can increase the risk of failure or malfunction, potentially leading to electrical power interruptions or transformer damage. Additionally, the switching operation of OLTCs can cause transient voltage spikes or harmonics, which can affect the performance of connected equipment or introduce additional stresses on the transformer windings. Overall, careful consideration of the specific application requirements and potential drawbacks is necessary when deciding whether to use an OLTC in a transformer design.
We hope this overview of How does an OLTC work? has made things clearer.
