Low-pressure side on-load tap changer

Abstract

The invention provides a low-voltage side on-load tap changer, which is provided with a main transformer consisting of a high voltage coil and a low voltage coil, a voltage regulation coil, a reactance-typed switch, a reactor and a voltage regulation transformer consisting of a parallel coil and a serial coil. A voltage regulation coil is arranged between the low voltage coil of the main transformer and an iron core; the voltage regulation coil is provided with classification sections by two-crosspiece tapping; the voltage regulation coil is provided with 10 shunting taps which are respectively connected with the contacts of the reactance-typed switch; the reactance-typed coil is also connected with the contact of the reactance-typed switch; the parallel coil of the voltage regulation transformer is connected in parallel with the voltage regulation coil of the main transformer; the serial coil of the voltage regulation transformer is connected in series with the low voltage coil of the main transformer. The low-voltage side on-load tap changer has the advantages of reducing the insulation level of the voltage regulation coil of the transformer, reducing the current passing the reactance-typed switch and easily arranging the tapping turns which comply with the voltage precision.

Description

technical field

[0001] The invention relates to a low-voltage side on-load voltage regulating transformer, which belongs to the technical field of transformers. Background technique

[0002] In power systems, we use step-up and step-down transformers to transfer electrical energy from the power plant to the consumer. Due to the input or removal of the user's electrical equipment, the grid voltage often fluctuates, which affects the running electrical equipment. The solution is to use a voltage regulating transformer. When the voltage fluctuates, the gear of the transformer will be changed accordingly to ensure the voltage stability of the secondary side, thereby eliminating the influence of the grid voltage fluctuation on the running electrical equipment. In order to adapt to changes in the power grid more quickly, it is often necessary to increase the number of voltage regulation stages of the transformer to refine the voltage difference of each stage or directly set the v...

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