What are the On Load and No Load Tap Changer?

What are the On Load and No Load Tap Changer?

Definition

The on-load tap-changer and no-load tap-changer of a transformer are devices used to regulate the output voltage of the transformer.

Load Tap Changer (LTC)

Effect

• Change tap position under load: The tap position can be adjusted when the transformer is under load without interrupting the power supply.

• Adjust the output voltage: Adjust the output voltage by changing the transformer ratio to adapt to different load requirements.

Peculiarity

• Flexible operation:the tap position can be adjusted without power failure.

• Automatic or manual control: Automatic or manual adjustment can be achieved to adapt to different application scenarios.

• Wide adjustment range: there are usually more tap positions to provide finer voltage regulation capabilities.

• High complexity: The structure is relatively complex and requires more maintenance.

Application scenario

• Power system: Widely used in power transmission and distribution networks to adapt to different load changes.

• Industrial sector: Used in factories and large facilities to ensure a stable voltage supply.

No-Load Tap Changer (NLTC)

Effect

• Change tap position when not under load: The tap position can only be adjusted when the transformer is not connected to the load.

• Adjust the output voltage: Adjust the output voltage by changing the transformer ratio, but it needs to be carried out under no-load conditions.

Peculiarity

• Simple structure: Compared with on-load tap-changer, the structure is simpler and the maintenance cost is lower.

• Easy operation: Usually manually operated by simple mechanical or electric means.

• Limited adjustment range: Few tap positions are provided and the adjustment range is relatively narrow.

Application scenario

• Small transformers: Suitable for small transformers or applications that do not require frequent adjustment of tap positions.

• Specific applications: In situations where frequent voltage regulation is not required, or in cost-sensitive applications.

Maintenance and inspection

• Regular inspection: Whether the tap-changer is loaded or unloaded, it needs regular inspection and maintenance to ensure that it works properly.

• Lubrication: Regularly lubricate the moving parts of the tap-changer to reduce wear.

• Clean: Remove dust and dirt around the tap-changer to avoid affecting operation.

• Electrical check: Check the electrical connection of the tap-changer to ensure good contact.

Matters needing attention

• Safe operation: When maintaining or adjusting the tap position, observe the safe operation rules.

• Environmental adaptability: Select the tap changer that is suitable for local environmental conditions.

Conclusion

By using on-load tap-changer and no-load tap-changer, the output voltage of the transformer can be adjusted according to actual needs, so as to ensure the stability and reliability of the power supply system.