High-frequency micro-electric protection mutual inductor

Abstract

The invention relates to a high-frequency micro-electric protection mutual inductor. The mutual inductor comprises a closed iron core formed by two magnetic cores made of a high-frequency ferrite softmagnetic material. A primary coil and a secondary coil are arranged on the two magnetic cores, and two leading-out ends of the primary coil are connected with a high-resistance resistor in series. The primary coil and the secondary coil are formed by winding enamelled copper wires in a multilayer mode, and the number of winding turns is larger than 4000. Enamelled copper wires used by the primarycoil and the secondary coil adopt a same specification, a diameter is less than 0.1 mm, and three strands of stranded wires are led out in the last circle during wire leading. And the resistance value of the high-resistance resistor is 330 kiloohms. And the two magnetic cores made of the high-frequency ferrite soft magnetic material adopt ER magnetic cores. The inductor is high in anti-electromagnetic interference capability, power grid pollution such as a surge current generated in power generation and the like is prevented, the inductor is widely used for micro-power protection of wind power generation, electrical transmission, subways and the like, and an electromagnetic noise and jitter are effectively prevented.

Description

technical field [0001] The invention relates to the technical field of voltage transformers, in particular to a high-frequency microelectric protection transformer. Background technique [0002] The basic structure of a voltage transformer is similar to that of a transformer, including two windings: a primary winding and a secondary winding, both of which are installed or wound on the iron core. There is insulation between the two windings and between the winding and the iron core, so that there is electrical isolation between the two windings and between the winding and the iron core. When the voltage transformer is running, the primary winding is connected to the line in parallel, and the secondary winding is connected to the instrument or relay in parallel. The number of turns in the primary winding is relatively large, and the number of turns in the secondary winding is relatively small. The primary voltage is high and the secondary voltage is low. [0003] In the pri...

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Problems solved by technology

[0003] In the prior art, the iron core of a voltage transformer is generally composed of silicon steel superimposed, and the transformer is prone to electromagnetic noise and jitter during long-term operation and frequent harsh environments; the surge voltage applied in the power generation system is prone to damage to the mutual inductance Damage to the device and circuit system

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