Current transformer capable of collecting sine waves and half-wave rectified current

Abstract

A current transformer capable of collecting sine waves and half-wave rectified current comprises a shell, a protection box, a protection box cover, an ultra-crystalline iron core, a nano-crystalline iron core, a coil, a pair of line connection nuts, an anti-theft transparent cover and fixing feet. The middle of the shell is provided with a through hole, the protection box is provided with a coil placement position, and the ultra-crystalline iron core and the nano-crystalline iron core are coplanar and sleeve a primary line via hole. The current transformer has advantages that the high-quality ultra-crystalline iron core has great electrical properties, highest initial permeability, low coercivity and high maximum permeability, the high-quality nano-crystalline iron core has great electrical properties, low coercivity and high direct-current saturation resistance, and under the joint action of the two iron cores, capabilities of accurately sensing power-frequency alternating current and half-wave direct current under an electromagnetic mutual inductance form are achieved, and metering accuracy of the current transformer is improved.

Description

Technical field [0001] The invention relates to the field of electric power measurement in the electric power industry, in particular to a current transformer capable of collecting sine wave and half wave rectified current. Background technique [0002] The current transformer is based on the principle of electromagnetic induction. The primary and secondary wires are wound on the same closed core. When a current appears on the primary wire, an induced current will appear on the secondary wire. Connect the measuring instrument to the secondary wire. By measuring the current on the secondary line, the current on the primary line can be calculated. [0003] The traditional current transformer can work normally when measuring ordinary alternating current, but when it is used to measure half-wave direct current: a current passes through a diode to produce a half-wave direct current pulsating current, and the half-wave direct current generated in the iron core is not alternating current....

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the current electromagnetic transformer cannot accurately measure the half-wave DC power, without changing the conventional measurement method, this technical solution uses two iron cores of different materials as the magnetic core, and uses their different magnetic properties to solve the magnetic problem. The core is saturated by the magnetic field generated by the half-wave DC current. On the premise of having the electrical performance of the traditional transformer, it also has the ability to resist DC even-order harmonic saturation. It can work under both power frequency AC and half-wave DC current. Ability to measure accurately

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