2025-2026 New Technology Trends According to the latest industry reports, current PD detectors are undergoing a leap from "single detection" to "intelligent fusion": Multimodal Fusion Detection: Mainstream high-end instruments (such as new products from Wuhan UHV, Guoke Dianyan, etc.) have integrated UHF + TEV + Ultrasonic + HFCT multiple sensors into one unit. Advantages: Simultaneously collect multiple physical quantities, cross-validate through algorithms, significantly reducing false alarm rates. For example, use TEV to detect anomalies, then use ultrasonic for precise location. AI Intelligent Diagnosis and Pattern Recognition: Built-in AI algorithms automatically identify discharge types (e.g., corona discharge, floating discharge, surface discharge, internal void discharge). Automatically generate PRPD patterns (Phase-Resolved Partial Discharge patterns) and compare with standard databases, directly providing "health score" and maintenance recommendations, reducing reliance on expert experience. Acoustic Imaging Fusion Location: Handheld devices equipped with microphone arrays and HD cameras. Effect: Directly overlay the discharge source location as a heatmap on the screen video, achieving "what you see is what you get" precise location, greatly improving inspection efficiency. Wireless Connectivity and Cloud Management: Support WiFi/5G transmission, real-time data upload to cloud operation platforms. Achieve full lifecycle insulation status trend analysis of equipment, promoting the shift from "periodic maintenance" to "predictive maintenance". 3. Main Application Scenarios Table Application Object Recommended Detection Method Typical Scenario High Voltage Switchgear TEV + Ultrasonic Daily inspection of distribution stations, no outage required, quick screening of insulation defects. GIS (Gas Insulated Switchgear) UHF (Internal/External) Factory acceptance test, on-site commissioning test, online monitoring during operation. Power Transformer Pulse Current Method + UHF + Ultrasonic Routine factory test, acceptance after on-site overhaul, fault diagnosis. High Voltage Cable HFCT (High Frequency Current Transformer) Live detection of cable terminations and intermediate joints. Instrument Transformer/Bushing Pulse Current Method Laboratory precision measurement or on-site outage testing. 4. Selection Guide: How to Choose the Right PD Detector? When selecting equipment, the following indicators should be carefully considered: A. Detection Accuracy and Anti-interference Capability Sensitivity: Can it detect weak signals <1pC? Signal-to-Noise Ratio: In strong electromagnetic interference environments of substations (e.g., near operating busbars), can it effectively filter background noise? (2025 new models typically require SNR >70dB). Bandwidth: Does it support wideband adjustment to adapt to different equipment? B. Functional Integration Multi-channel Synchronization: Does it support multi-channel simultaneous acquisition (e.g., measuring A/B/C three phases simultaneously) to analyze discharge phase relationships? Sensor Compatibility: Are interfaces reserved to support external sensors (UHF, AE, HFCT, etc.)? C. Intelligence Level Pattern Analysis: Does it have standard pattern display functions such as PRPD, PRPS? Automatic Recognition: Is there AI-assisted diagnostic functionality to automatically determine discharge type? Report Generation: Can it generate test reports compliant with national/industry standards with one click? D. Portability and Compliance Weight and Battery Life: Handheld devices should be lightweight (<2kg), battery life >8 hours. Standard Compliance: Must comply with IEC 60270, GB/T 7354 and other domestic and international standards. 5. Usage Precautions Background Noise Measurement: Before formal testing, environmental background noise must be measured without applying voltage or without the device under test, to subtract interference later. Sensor Coupling: For ultrasonic detection, apply coupling gel to ensure tight contact between sensor and equipment surface. For TEV detection, ensure the sensor is tightly attached to the metal cabinet gaps. Safety Protection: During high voltage testing, strictly follow high voltage test safety regulations, set up barriers, and have dedicated supervision. During live detection, maintain sufficient safety distance and use insulating rods to operate sensors. Data Comparison: Single measurement values are for reference only; more important are horizontal comparisons (between similar equipment) and vertical comparisons (historical data trends of the same equipment). 6. Market Mainstream Brand Reference (2026 Edition) International Brands: Doble (USA), OMICRON (Austria, preferred for high-end laboratories), HVPD (UK). Leading Domestic Brands: Wuhan UHV Electric Power: Outstanding in multimodal fusion and online monitoring systems. Guoke Dianyan: High market share in handheld acoustic imaging fusion PD detectors. Wuhan Musen Electric: Provides complete high voltage test solutions with high cost performance. Shanghai Siyuan Hongrui: Deep accumulation in power grid online monitoring field.
