Transformer Partial Discharge Online Monitoring Device

Product Introduction

Our company created the Transformer Partial Discharge Online Monitoring System in accordance with the pertinent online monitoring technical requirements outlined in State Grid's "Technical Specifications for Live Testing of Power Equipment" and "General Technical Specifications for Online Monitoring Devices of Substation Equipment." The system uses high-frequency pulse current partial discharge detection technology, external ultra-high frequency partial discharge detection technology, and contact-type ultrasonic partial discharge detection technology. Power transformers rated at 110 kV and higher can use it for real-time monitoring and anomaly alerts of partial discharge signals. It has several communication channels, excellent anti-interference capabilities, and great sensitivity.

Product Parameter (specification)

Scope of Application
Enables live testing of equipment without power interruption, suitable for online monitoring of ultra-high frequency (UHF), high-frequency partial discharge signals, and ultrasonic signals in transformer equipment.
△ Environmental Conditions
Ambient temperature	-30°C to 60°C;
Relative humidity	≤95%;
△ Power Supply	External AC 220V supply;
△ Sensor	High-frequency partial discharge detection Detection frequency band;300kHz to 30MHz; Signal transmission method;50Ω coaxial cable; Gain;72dB; Sensor mounting method;Clamp-on; High-frequency filter;Bandpass 3MHz to 30MHz, 300kHz to 30MHz, 100kHz to 30MHz (selectable) Ultra-high frequency partial discharge detection
Detection frequency band	300MHz–1500MHz;
Signal transmission method	50Ω coaxial cable;
Amplification	≥40dB;
Ultra-high frequency filter	Band-reject
690–960MHz, Effect	≥50dB;
Contact ultrasonic detection
Detection Bandwidth	20kHz–300kHz;
Signal Transmission Method	50Ω coaxial cable;
Preamplifier	20–80dB adjustable;
Spectrum Display
Multiple spectrum display modes	Trend line graph, PRPD, PRPS, phase line graph, four-element diagram, flight spectrum, etc.

Product feature and application

● Distributed Layout with Strong Scalability

The monitoring terminals are networked. When adding or removing terminals from the existing layout, the system automatically identifies and configures them without requiring additional setup.

● Real-Time Monitoring

The system records real-time data from each monitoring node, with flexible monitoring cycle settings.

● High Sensitivity

Minimum detectable discharge signal is 5 pC.

● Timely Alerts

When a node detects abnormal partial discharge levels, it rapidly feeds back to the monitoring server. Server software logs essential information and issues alerts to users.

● Shock Resistance

Withstands 600kV flashover impacts without damaging terminal equipment or losing data.

● Interference Resistance

Features time-domain and frequency-domain signal analysis technology to effectively separate interference signals from partial discharge signals, while preventing interference at the instrument's power supply end.

● Edge Computing

Aligns with current IoT terminal design principles, processing data locally at the edge while enabling remote analysis and data replay/retrieval mechanisms.

● Stable Transmission

Leverages robust mobile networks for direct, reliable long-distance data transmission to servers with minimal latency.

● Secure Integration

System integration does not compromise transformer sealing or insulation integrity, ensuring uninterrupted safe operation of equipment.

Prodection details

Suitable for power transformers rated at 110kV and above, this system enables online monitoring of ultra-high frequency (UHF), high-frequency (HF) partial discharge signals, and ultrasonic signals for equipment at substations, power plants, and other sites without power interruption. It facilitates defect diagnosis and anomaly alerts.

Company Qualifications

FAQ

1)What are the core detection technologies of the transformer partial discharge online monitoring system?

Answer: The system employs three core detection technologies: contact ultrasonic partial discharge detection, external ultra-high frequency partial discharge detection, and high-frequency pulse current partial discharge detection. These technologies are integrated to comprehensively capture transformer partial discharge signals.

2)Does installing the transformer partial discharge online monitoring system affect the original performance of the transformer?

Answer: No. System integration does not alter the transformer's sealing or insulation properties, nor does it impact safe operation. Installation is simple and convenient, suitable for on-site deployment on main transformers without modifying existing functional components.

3)How does the transformer partial discharge online monitoring system achieve anomaly early warning?

Answer: The system continuously monitors partial discharge data at all nodes. When abnormal discharge levels are detected at any node, the signal is rapidly relayed to the monitoring server. The server software records critical information and promptly alerts users. Simultaneously, the software periodically stores monitoring data, providing long-term trend graphs of partial discharge signals to aid in the early prediction of potential risks.

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