A High Accuracy Rectangular Current Coil with Constant Proportion of Length and Width

Abstract

The invention relates to a high-accuracy rectangular current coil with a fixed length-width ratio. The high-accuracy rectangular current coil comprises four straight cylindrical coils; the four straight cylindrical coils form the entire current coil; the four straight cylindrical coils are connected with one another end to end; the single straight cylindrical coil is shaped to be a cylindrical hollow structure, and the frame of the single straight cylindrical coil is made of epoxy resin; the straight cylindrical coils are installed in a rectangular box; a plurality of clamping posts are arranged in the rectangular box and are used for clamping the four straight cylindrical coils, which enables quickness and convenience in installation; and the single straight cylindrical coil can be woundsimply, and can be wound by hundreds of turns under a condition of a length of 21 mm according to a winding diameter, and therefore, measurement accuracy can be effectively improved. As for a problemthat the edge corners of an entire current coil formed by straight cylindrical coils have no coil turns, the length-width ratio of the coil of the invention is properly designed, so that the influenceof factors such as adjacent phase current and conductor bias can be decreased, and therefore, the measurement accuracy of the rectangular current coil can be greatly improved.

Description

technical field [0001] The invention relates to a high-accuracy rectangular current coil with a constant ratio of length and width, which is used for real-time and accurate measurement of wire current. Background technique [0002] Current measurement is very important for judging the operating status of equipment connected to the line. Through the measurement of line current, parameters such as current amplitude, phase, waveform, and harmonic content can be obtained in a timely and accurate manner, which can reflect and evaluate the operating status of line equipment in real time, and then Propose reasonable maintenance or countermeasures. [0003] At present, there are generally several methods for monitoring line current: traditional electromagnetic transformers, optical sensors, and air-core coils. The traditional electromagnetic transformer is bulky, heavy, and has a narrow measurement frequency band, which limits its application; the optical sensor has complex manufac...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of small output signal, low signal-to-noise ratio, and being easily affected by adjacent phase current or wire eccentricity in the current air-core coil, the present invention provides a high-accuracy rectangular current coil with a fixed ratio of length and width.

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