On-load tap changing and off-load tap changing

The difference between a on-load tap-changing transformer and an off-load tap-changing transformer is that the former is equipped with a tap-changing device that allows voltage adjustment while the load is still connected, whereas the latter can only adjust the voltage by changing the position of the tap changer when the power is shut off. On-load tap-changing transformers are used in applications where strict voltage quality requirements must be met. An automatic voltage regulation, detection, and control system can also be added to automatically adjust the voltage when it falls outside the specified range. Its main advantages are the ability to adjust the voltage under load within a rated capacity range, along with a wide voltage regulation range; this can reduce or prevent significant voltage fluctuations and ensure high-quality busbar voltage. However, it has a large size, complex structure, high cost, and requires stringent maintenance and servicing. No-load tap-changing transformers require power shutdown to change the position of the tap changer, and the range of adjustment is limited (a 2.5% or 5% voltage change per tap change). The quality of the output voltage is poor, but they are relatively inexpensive and compact in size.

The difference between a on-load tap-changing transformer and an off-load tap-changing transformer is that the former is equipped with a tap-changing device that allows voltage adjustment while the load is still connected, whereas the latter can only adjust the voltage by changing the position of the tap changer when the power is shut off. On-load tap-changing transformers are used in applications where strict voltage quality requirements must be met. An automatic voltage regulation, detection, and control system can also be added to automatically adjust the voltage when it falls outside the specified range. 8 D0 A) d’ _& J& u% E0 `8 E; P Its main advantages are the ability to adjust the voltage under load within the rated capacity range, along with a wide voltage regulation range. This helps to reduce or prevent significant voltage fluctuations, resulting in high-quality busbar voltage. However, it has a large size, complex structure, high cost, and requires meticulous maintenance. + For no-load tap-changing transformers, it is necessary to de-energize the transformer in order to change the position of the tap changer. The adjustment range is limited (each tap change results in a voltage adjustment of 2.5% or 5%). The quality of the output voltage is poor; however, these transformers are relatively inexpensive and compact in size.

This post was last edited by zhaohh3211 on 2011-3-8 21:34. The difference between the two is whether it is under load or not. The load refers to the issue of whether there is a load or not.

This post was last edited by zhaohh3211 on 2011-3-8 at 21:36. Purpose: Simply put, an on-load tap changer is a transformer that can adjust its voltage while under load (during operation). Structure: On-load voltage regulation is provided on the high-voltage side, with a load-bearing voltage regulation device that enables real-time adjustment of the number of turns in the high-voltage coil during operation, thereby maintaining stability in the voltage on the low-voltage side ； The turns ratio of a tap-changing transformer is fixed; the turns can only be adjusted using taps when the transformer is not in operation, in order to adjust the voltage. Uses: On-load tap changing is used in places where high requirements are placed on the quality of secondary voltage, such as large step-down substations; it is also utilized in enterprises with significant fluctuations in secondary voltage, like aluminum plants ； No-load voltage regulation is suitable for any location where there are no strict requirements regarding voltage fluctuations.