Magnetically shielded structure for magnetically modulated voltage sensors

Abstract

The invention discloses a magnetic shielding structural part of a magnetic modulation voltage transducer. The magnetic shielding structural part comprises a base, a cover housing, an upper shielding plate, a shielding sleeve and a lower shielding plate. The base comprises a base plate, wherein a cylinder with an open upper end is fixed on the base plate, the lower shielding plate is fixed at the bottom in the cylinder, the upper shielding plate is fixed at the upper portion in the cylinder, and the lower shielding plate, the cylinder and the upper shielding plate define an internal cavity. The shielding sleeve is fixed outside the cylinder in a sleeved. The upper shielding plate, the lower shielding plate and the shielding sleeve are made from silicon steel. The cover housing is fixed with the base, the cover housing covers the cylinder and the shielding sleeve, and the top face of the cover housing is provided with a wire penetrating hole communicated with the internal cavity. The magnetic shielding structural part is provided with a shielding space defined by the upper shielding plate, the lower shielding plate and the shielding sleeve, prevents an external magnetic field from interfering magnetic circuit parts in the shielding space and is good in shielding effect, compact in shielding structure and low in manufacturing cost.

Description

technical field [0001] The present invention relates to a voltage sensor, in particular to a magnetic shielding structure for a magnetically modulated voltage sensor. Background technique [0002] The voltage sensor based on the principle of magnetic modulation is composed of a high-permeability annular nickel-iron alloy coil, an electronic circuit, etc., and uses the alternating saturation characteristics of the high-permeability core under the excitation of the internal square wave voltage to quickly convert the current generated by the primary side measurement voltage. The signal is quickly modulated to the secondary coil through the principle of equal ampere turns, so that the output current of the secondary coil can accurately follow the change of the primary voltage signal. [0003] Since the magnetic circuit part of the magnetic modulation voltage sensor is sensitive to the influence of the external magnetic field, the magnetic field shielding of the magnetic componen...

AI Technical Summary

Problems solved by technology

The general method of the existing magnetic modulation voltage sensor to solve the magnetic field interference is to spray the inside of the shield with the secondary coil installed with a paint layer with a shielding effect to make it have a shielding effect. However, after the radio frequency electromagnetic field space radiation immunity test, its The shielding effect is not ideal, and the shielding paint layer may couple the signal between the primary and secondary coils, affecting the measurement accuracy

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