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What are the voltage regulators for high voltage transformers?
Apr 16, 2018

      

         What are the voltage regulators for high voltage transformers?


A high-voltage transformer is a commonly used electronic device for electronic products and is an electromagnetic induction device that converts low-frequency low-voltage to low-frequency high-voltage. When the primary winding passes through the alternating current, the transformer generates an alternating magnetic field. By the induction of the alternating magnetic field, the secondary winding also generates an alternating magnetic field correspondingly to generate the alternating current electromotive force, the voltage level of the secondary winding and the number of turns of the secondary winding. Than the relationship, that is, the voltage is proportional to the number of turns, the main role of high voltage is to convert the low voltage into the required high voltage insulation is particularly important in the production process, many manufacturers of product quality is mainly reflected in the insulation process, do Good insulation is the top priority for high voltage transformers.


There are two types of transformer voltage regulation, on-load voltage regulation and no-load voltage regulation. On-load voltage regulation refers to: the transformer can adjust the tap position of the transformer during operation, thus changing the transformer ratio to achieve the purpose of pressure regulation. In the on-load voltage regulator transformer, there are two methods of adjusting the voltage at the wired end and regulating the neutral point, that is, the difference between the transformer tap at the high winding end or the high voltage winding neutral side. The tap can reduce the insulation level of the transformer tap at the neutral point side, which has obvious advantages, but requires the transformer to be directly grounded at the neutral point during operation.

With on-load voltage regulation and no-load voltage regulation, the on-load tap-changer is used to change the tapping of the transformer under load conditions to achieve the purpose of adjusting the voltage. When there is no field voltage regulation, it is not the secondary load of the transformer, but the transformer is disconnected from the power grid on all sides, and the tap of the winding is changed under the condition of no excitation of the transformer. On-load voltage regulation and no-load voltage regulation, on-load voltage regulation is generally 19 files, each file is 1.25%, and no-load pressure control is generally 1.5% or 2.5%. No load voltage regulators need to stop the transformer, there is no load.


Transformer off-circuit tap-changers have a narrow range of rated voltage and fewer adjustment stages. The rated voltage regulation range is expressed as a percentage of transformer rated voltage of ±5% or ±2×2.5%.

Generally, large-scale power transformers use on-load tap-changers, and small-sized distribution transformers are generally unloaded.


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