A high voltage two-stage voltage transformer

Abstract

The invention discloses a high-voltage double-stage voltage transformer, comprises a first stage core C1, second stage core C2, Proportional winding N1, Proportional winding N2, excitation winding N3,excitation winding N4, A first-stage core C1 and a second-stage core C2 are enclosed in rectangular frames, the rectangular frame surrounded by the second core C2 is smaller than the rectangular frame surrounded by the first core C1, the second stage core C2 is located in the interior space of the frame surrounded by the first stage core C1, the rectangular frame surrounded by the second-stage iron core C2 is parallel to each side of the rectangular frame surrounded by the first-stage iron core, The direction of the first stage core C1 and the magnetic field line coincides with the directionof the magnetic field line of the second stage core C2, N3 and N4 are wound around the first stage core C1 to form a first stage voltage transformer, and N1 and N2 are wound around the first stage core C1 and the second stage core C2 to form a second stage voltage transformer. The first stage core C1 and the magnetic field line direction coincide with the direction of the magnetic field line of the second stage core C2. The insulation problem between high voltage windings is solved, and the problems of low accuracy and poor carrying capacity are also solved.

Description

technical field [0001] The present application relates to the technical field of high-voltage testing, in particular to a high-voltage double-stage voltage transformer. Background technique [0002] The double-stage voltage transformer has the advantages of high accuracy, good stability, and strong load capacity, and is used as a standard instrument for power frequency voltage ratio. A typical application is an inductive voltage divider, such as a 1kV inductive voltage divider, with an uncertainty of 10 -7 . The double-stage voltage transformer has two primary windings, the first-stage winding must pass through the second-stage winding, and the insulation between the windings is difficult to design, so the rated voltage of the double-stage voltage transformer generally does not exceed 35kV. In order to solve the insulation problem under high voltage conditions, the structure can be improved, and the low voltage excitation method is adopted, which is composed of two transfo...

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Problems solved by technology

[0003] This application provides a high-voltage double-stage voltage transformer, which is used to solve the insulation problem between high-voltage windings, and at the same time solve the problems of low accuracy and poor load capacity

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