Current Sensors, As Specialized Devices For Current Measurement In Power Systems, Have Been Widely Applied In High-Current And High-Precision Measurement Fields. Real-Time Current Monitoring Not Only Reflects Grid Operation Status For Optimal Resource Allocation, But Also Enables Early Detection Of Fault Zones And Types To Prevent Major Accidents. In Recent Years, With The Development Of New Energy Sectors, Large-Scale Nonlinear Loads Connected To Power Grids Have Introduced Significant Harmonic Components. Coupled With Rapid Advancements In Power Electronics And Measurement-Control Technologies, The Time-Varying Characteristics Of Current Measurement Signals Have Intensified, Rendering Traditional Methods Inadequate. This Necessitates The Development Of Novel Current Measurement Solutions.

Current Sensors In Modern Power Systems Primarily Fall Into Four Categories:

1.Closed-Loop Feedback AC/DC Current Transformers

2.Ohm's Law-Based Shunt Devices (AC/DC Shunts, Impulse Shunts)

3.Magnetic Field Measurement Sensors (Rogowski Coils, Magnetoresistive Current Sensors)

4.Magneto-Optic Effect-Based Optical Current Transformers (e.g., Fiber Optic Current Sensors)

The Magnetoresistance (MR) Phenomenon Was First Observed By William Thomson In The Mid-19th Century, Where Permalloy's Resistance Changes Under Magnetic Fields. However, It Was The Giant Magnetoresistance (GMR) Effect That Initially Gained Research Momentum, With Tunnel Magnetoresistance (TMR) Technology Only Receiving Significant Attention In The Past Two Decades. Magnetoresistive Current Measurement Technologies Have Subsequently Evolved, Categorized Into Three Types Based On Sensing Unit Structures: Anisotropic Magnetoresistance (AMR), Giant Magnetoresistance (GMR), And Tunnel Magnetoresistance (TMR).

With The Expansion Of Smart Grids And Microgrids, Sensor Requirements Have Become More Stringent. TMR-Based Current Sensors Excel With Compact Size, High Accuracy, Excellent Linearity, Cost-Effectiveness, Wide Bandwidth, And Superior Performance - Making Them Ideal For Low-Current Measurements In Modern Power Systems. Continuous Optimizations Including Magnetic Tunnel Junction Materials, Integrated Flux Concentrators, Circuit Design Improvements, And TMR Array Configurations Have Significantly Reduced Measurement Errors While Enhancing Precision And Sensitivity. TMR Current Sensors Now Meet Most Power Industry Measurement Demands And Can Be Combined With Other Sensor Types For High-Voltage DC Transmission System Monitoring. (Source: Electrical Measurement & Instrumentation)

Guangdong ETCR Technology Co., Ltd. specializes in R&D and production of power testing instruments and power quality management solutions. With nearly two decades of expertise, the company prioritizes technological innovation and independent R&D, delivering meticulously crafted products and tailored services. ETCR supports OEM & ODM customization to maximize client value. As the manufacturer of the Microampere-Level Split-Type Current Sensor ETCR EM022KU and Flat-Mouth Leakage Current Sensor, ETCR is committed to excellence.
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