Online partial discharge sensors
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Introduction
Partial discharge (PD) sensors are crucial for monitoring the insulation condition of high-voltage electrical equipment. Online PD sensors enable real-time detection and localization of PD events, which helps in preventing equipment failures and ensuring the reliability of power systems.
Key Insights
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Noise Reduction and Signal Processing:
- Online PD sensors often incorporate advanced noise reduction techniques and digital signal processing to improve detection accuracy and reliability .
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Sensor Types and Technologies:
- Various sensor technologies are used for online PD detection, including Fabry-Pérot optical fiber sensors, piezoelectric sensors, ultrasonic sensors, and transient earth voltage (TEV) sensors. Each type offers unique advantages such as high sensitivity, immunity to electromagnetic interference, and ease of installation .
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Localization Capabilities:
- Accurate localization of PD sources is achieved using sensor arrays and algorithms like the steered response power algorithm. This is essential for identifying the exact location of insulation defects .
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Wireless and Remote Monitoring:
- Wireless sensor networks (WSNs) and remote monitoring capabilities are increasingly being integrated into PD detection systems. These technologies facilitate easy deployment, reduce maintenance costs, and enable real-time monitoring from remote locations .
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Applications in Different Equipment:
- Online PD sensors are applied in various high-voltage equipment, including gas-insulated switchgear (GIS), transformers, underground cable joints, and rotating machines. Each application benefits from tailored sensor designs and monitoring strategies .
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Economic and Practical Considerations:
- Cost-effective and easy-to-operate PD sensors are essential for widespread adoption. Innovations in sensor design and data processing have made online PD monitoring more accessible and practical for routine maintenance .
Conclusion
Online partial discharge sensors are vital for the real-time monitoring and maintenance of high-voltage electrical equipment. Advances in sensor technology, noise reduction, and signal processing have significantly improved the accuracy and reliability of PD detection. The integration of wireless and remote monitoring capabilities further enhances the practicality and cost-effectiveness of these systems, making them indispensable tools for ensuring the safe and efficient operation of power systems.
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