Double-shielded dry type mutual inductor

Abstract

The invention discloses a double-shielded dry type mutual inductor. The double-shielded dry type mutual inductor comprises an iron core, a sleeve, an insulating layer, an insulation sealing tube, a silicone rubber umbrella skirt, a grounding electrode, a shell, a secondary winding and an electric stress relieving layer. The electric stress relieving layer is arranged outside the insulating layer, the root portion of the electric stress relieving layer is connected with the grounding electrode, and at least one layer of shielded coil is arranged outside the secondary winding. By means of the double-shielded dry type mutual inductor, the problem that voltage distribution along the surface of a high-tension current inductor is uneven can be effectively solved, discharge voltages along the surface are increased substantially, the strong electromagnetic field interference problem of a large current main loop is solved, the structure is simple, the performance is reliable, by the adoption of the shielded coil, the shielding effect which is superior to the effect of a high conductivity metal shell abroad can be achieved only by using a common metal shell, and the function for protection of the mutual inductor can be further achieved through the metal shell.

Description

technical field [0001] The invention relates to a transformer, in particular to a double-shielded dry-type transformer. Background technique [0002] With the development of my country's electric power industry, due to the large loop current of this large-capacity generator set and the close spacing of each phase, a strong electric field will be generated. If the magnetic field cannot be shielded, it will not only seriously interfere with the transformer , and affect the measurement results. In order to solve the problem of strong electromagnetic field interference in the large current main circuit, some foreign manufacturers have begun to adopt protection measures on the outer layer of the current interconnection. For example, Westinghouse in the United States has added a metal shielding shell to the outer layer of the transformer. However, because this kind of shielding shell not only requires it to have high metal purity and conductivity, but also has an appropriate thick...

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Problems solved by technology

In this way, many capacitive screens need to be embedded in the insulation of the entire current transformer, which is not conducive to the mechanized production of current transformers

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