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The UHF Online PD Monitoring System for GIS Switchgear is a cutting-edge solution designed to detect and analyze Partial Discharge (PD) activity in Gas Insulated Switchgear (GIS) systems. By leveraging Ultra High Frequency (UHF) technology with a detection bandwidth of 500–1500 MHz and a dynamic range of -70–10 dB , this system provides real-time insights into the insulation integrity of GIS components, enabling proactive maintenance and minimizing downtime. Partial discharges, often precursors to catastrophic failures in high-voltage equipment, are detected through UHF sensors that capture electromagnetic signals emitted during discharges . The system is engineered to operate in extreme environmental conditions, with a temperature range of -40°C to 85°C and humidity tolerance of 0–100% RH , ensuring reliable performance in both indoor and outdoor substations.
The system’s 500–1500 MHz UHF detection range aligns with industry standards (300 MHz–3 GHz) , allowing it to capture a broad spectrum of PD signals generated by common GIS defects, such as free metal particles, insulator cracks, or floating potentials. This wide bandwidth ensures high sensitivity to incipient faults, even in noisy electromagnetic environments.
With a dynamic range of -70–10 dB, the system distinguishes between weak PD signals and background noise, providing accurate and reliable data for diagnostic purposes. This capability is critical for identifying low-level discharges that may escalate into major failures if left undetected .
Built to withstand harsh conditions, the system operates seamlessly across -40°C to 85°C with ±0.5°C accuracy and 0–100% RH with ±2% RH precision . This makes it suitable for applications in extreme climates, including desert regions, coastal areas, and high-altitude locations.
The system supports both battery (5+ years standby) and wired power , ensuring continuous operation even during power outages. The long-lasting battery eliminates the need for frequent replacements, reducing maintenance efforts.
Equipped with wireless 433 MHz and RS485 interfaces , the system enables remote data transmission to centralized monitoring platforms. This feature facilitates real-time analysis and integration with existing SCADA systems, enhancing operational efficiency.
Measuring 121mm × 121mm × 55mm , the system's compact design allows for hassle-free installation using magnetic suction mounting. This non-invasive method ensures quick deployment without disrupting GIS operations, making it ideal for retrofitting existing infrastructure.
The system is widely used in HV/MV substations to monitor GIS equipment, including circuit breakers, busbars, and insulators. By detecting PD at early stages, it helps utilities prevent unexpected outages and extend equipment lifespan.
In solar and wind power plants, where grid stability is critical, the system ensures reliable operation of GIS switchgear connected to step-up transformers. It mitigates risks associated with voltage fluctuations and environmental stressors.
Heavy industries, such as mining and manufacturing, rely on GIS for high-power distribution. The system’s ability to detect PD in real time supports predictive maintenance strategies, reducing production downtime and operational costs.
For long-distance power transmission, the system monitors GIS components in HVDC and HVAC networks, ensuring compliance with strict safety and performance standards. Its UHF technology effectively identifies PD sources in complex grid environments .
Q: How does the UHF Online PD Monitoring System differ from other PD detection methods?
A: Unlike traditional methods (e.g., ultrasonic or TEV), UHF technology offers broader bandwidth and higher sensitivity to PD signals, making it more effective for detecting internal defects in GIS. Its immunity to electromagnetic interference ensures accurate results in high-noise environments .
Q: Can the system be installed without disconnecting the GIS?
A: Yes. The system uses magnetic suction mounting, allowing non-invasive installation on the exterior of GIS enclosures. This eliminates the need for system shutdowns, minimizing operational disruption .
Q: What environmental conditions can the system tolerate?
A: The system operates reliably in temperatures ranging from -40°C to 85°C and humidity levels up to 100% RH . It is designed for outdoor use and complies with IP65 standards for dust and water resistance.
Q: How is data from the system analyzed?
A: Data is transmitted via wireless 433 MHz or RS485 to a centralized monitoring platform. Advanced algorithms process the data to identify PD patterns, severity levels, and potential fault locations, generating actionable insights for maintenance teams .
Q: What is the typical lifespan of the battery power supply?
A: The battery provides 5+ years of standby operation , ensuring continuous monitoring even during extended power outages. Wired power options are available for permanent installations.
