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Related Concept Videos

Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

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Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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Primary Distribution01:28

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Primary distribution systems deliver electrical power from substations to consumers through various voltage classes, with 15-kV class voltages being predominant among U.S. utilities. Older 2.5- and 5-kV classes are being replaced by 15-kV primaries, while higher 25- to 34.5-kV classes are used in high-density urban areas and rural regions with long feeders. Three-phase, four-wire multigrounded systems are widely employed for balanced power delivery, using the neutral wire as a grounding point.
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Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

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Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
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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.
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Reclosers and Fuses01:26

Reclosers and Fuses

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Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
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Differential Relays

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Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
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Related Experiment Video

Updated: Jan 13, 2026

Author Spotlight: Enhancement of Salient Object Detection for Smart Grid Applications
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PBZGNet: A Novel Defect Detection Network for Substation Equipment Based on Gradual Parallel Branch Architecture.

Mintao Hu1,2, Yang Zhuang2,3, Jiahao Wang2

  • 1College of Computer and Information Engineering (College of Artificial Intelligence), Nanjing Tech University, Nanjing 211816, China.

Sensors (Basel, Switzerland)
|January 10, 2026
PubMed
Summary

PBZGNet enhances substation equipment defect detection by improving small target identification and precise localization. This new network significantly outperforms existing models like YOLOv11 and YOLO-SD, boosting grid reliability.

Keywords:
attention mechanismdefect detectionfeature fusionsubstation equipment

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Area of Science:

  • Electrical Engineering
  • Computer Vision
  • Artificial Intelligence

Background:

  • Substation equipment operation is crucial for grid reliability.
  • Existing deep learning detectors face challenges with small targets, multi-scale features, and precise localization in cluttered substation scenes.

Purpose of the Study:

  • To introduce PBZGNet, a novel defect-detection network designed to overcome limitations in current substation equipment monitoring.
  • To improve the detection accuracy and localization precision of defects in complex substation environments.

Main Methods:

  • Developed PBZGNet featuring a gradual parallel-branch backbone (BiCoreNet), a zoom-fusion neck (ZFusion, Concat-CBFuse), and a global channel-recalibration module.
  • Integrated an attention-guided decoupled detection head (ADHead) and employed Generalized Focal Loss with a quality rating scheme and distribution regression.

Main Results:

  • PBZGNet demonstrated superior performance compared to YOLOv11 across all scales.
  • The lightweight PBZGNet-n achieved 83.9% mAP@50 with 2.91 M parameters, outperforming YOLOv11-n by 9.3%.
  • The full PBZGNet surpassed the YOLO-SD model by 7.3% mAP@50, establishing a new state-of-the-art.

Conclusions:

  • PBZGNet effectively addresses the challenges of small target detection, multi-scale feature fusion, and precise localization in substation defect detection.
  • The proposed network sets a new state-of-the-art in substation equipment defect detection, enhancing overall grid reliability.