Current sensor

Abstract

The invention discloses a current sensor, which comprises a current sampling wireless emission system (10) and a wireless receiving displaying communication system (20), wherein the systems (10, 20) are connected wirelessly, the system (10) comprises serially connected an input unit (11), a single-chip computer system (15) and a data wireless emitter (16), the input unit (11) uses a nanometer magnetic tunnel magnetic sensor (12) to sample signal. The invention has accurate measurement, high safety and reliability, wide application and strong adaptability, which is suitable for the application in high-voltage large-current condition. The invention has compact structure, low weight, low cost, easy installment and maintenance, which is suitable for network measurement and can meet the demands of modern electric power system as intelligentization, modularization, datamation, maintenance-free, miniaturization and multifunction.

Description

technical field [0001] The invention relates to a current sensor, in particular to a current sensor using nanoscale magnetic tunnel junction technology. Background technique [0002] Electromagnetic transformers have been fully developed for quite a long period of time, but some of their inherent weaknesses are difficult to meet the development needs of automation and digitalization of modern power systems. This has become the bottleneck of the rapid development of the power industry. [0003] The traditional electromagnetic transformer mainly has the following disadvantages: [0004] 1. Large size, heavy weight and high price. [0005] 2. The current transformer has an iron core, and the output current is non-linear. [0006] 3. High-amplitude currents are prone to magnetic saturation, which seriously distorts the secondary current, causing malfunction and refusal of relay protection devices. [0007] 4. The measurement range is small, the frequency band used is narrow,...

AI Technical Summary

Problems solved by technology

[0004] 1. Large size, heavy weight and high price

[0005] 2. The current transformer has an iron core, and the output current is non-linear

[0006] 3. High-amplitude currents are prone to magnetic saturation, which seriously distorts the secondary current, causing malfunction and refusal of relay protection devices

[0007] 4. The measurement range is small, the frequency band used is narrow, and there are many varieties and specifications

[0008] 5. The measurement error is large, and the phase deviation is an inherent defect of the traditional transformer

[0009] 6. The cost of insulation is high, and the original air insulation, oil-paper insulation, gas insulation and cascaded insulation can no longer meet the requirements of ultra-high voltage insulation

[0010] 7. Electromagnetic resonance, flammable and explosive, etc.

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