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Related Concept Videos

Overcurrent Relays01:26

Overcurrent Relays

64
Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
64
Power System Distribution01:25

Power System Distribution

224
Power system distribution involves delivering electrical energy from power plants to consumers through a network of transmission and distribution systems. The process begins at power plants, where energy from coal, gas, nuclear, water, and wind is converted into electrical energy. These plants use three-phase generators, typically rated between 50 to 1300 MVA, with terminal voltages ranging from a few kV to 20 kV, depending on the size and age of the units.
The transmission system is designed...
224
Secondary Distribution01:25

Secondary Distribution

75
Secondary distribution systems provide electrical energy at the utilization voltage levels from distribution transformers to customer meters. Typical secondary voltages in the United States include 120/240 V for residential use, 208Y/120 V for residential and commercial use, and 480Y/277 V for industrial and high-rise commercial use.
In residential areas, 120/240 V single-phase, three-wire service is commonly used for lighting, outlets, and large appliances. Urban areas with high-density loads...
75
Instrument Transformers01:23

Instrument Transformers

63
Instrument transformers, comprising voltage transformers (VTs) and current transformers (CTs), play crucial roles in power substations by providing isolated replicas of current or voltage for measurement and protection purposes. Voltage transformers reduce the primary voltage to levels suitable for relay operation and measurement, while current transformers scale down the primary current. The primary winding of a current transformer often consists of a single turn, achieved by threading the...
63
Directional Relays01:25

Directional Relays

84
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
84
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

61
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
61

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High-Precision, Self-Powered Current Online Monitoring System Based on TMR Sensors Array for Distribution Networks.

Zhengang An1, Lei Zhang1, Zhi Wang1

  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.

Sensors (Basel, Switzerland)
|March 17, 2025
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Summary

This study introduces a self-powered system for precise, real-time current monitoring in power distribution networks. The innovative solution uses TMR sensors and a neural network to ensure high accuracy and stability for smart grid applications.

Keywords:
TMR sensorcurrent online monitoring systemcurrent sensorpower distribution networkself-powered

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Area of Science:

  • Electrical Engineering
  • Smart Grid Technology
  • Sensor Networks

Background:

  • Smart grids require comprehensive real-time monitoring for efficient operation.
  • Distribution networks (DNs) often lack adequate current monitoring due to complexity.
  • Existing systems face challenges with accuracy and power supply in DNs.

Purpose of the Study:

  • To develop a high-precision, self-powered online current monitoring system for distribution networks.
  • To address limitations in current sensing within complex DN environments.
  • To enable reliable wide-area online monitoring for smart grid advancement.

Main Methods:

  • Integration of a Tunnel Magnetoresistance (TMR) sensor array, main control module, and Current Transformer (CT) power harvesting module.
  • Development of a neural network-based algorithm to correct for wire eccentricity errors in TMR sensors.
  • Wireless data transmission via 4G for remote monitoring and continuous 24-hour validation.

Main Results:

  • The TMR sensor array achieved a measurement range of 0-300 A with a sensitivity of 25.38 mV/A.
  • The neural network correction algorithm reduced average error to 1.23%, enhancing measurement accuracy.
  • The self-powered system demonstrated high precision and stability during continuous 24-hour monitoring of DNs.

Conclusions:

  • The proposed system offers an effective solution for high-accuracy online current monitoring in distribution networks.
  • The integration of TMR sensors, neural network correction, and self-powering addresses key challenges in DN monitoring.
  • This technology facilitates the realization of a more robust and intelligent smart grid infrastructure.