OM.R921-T Transformer Bushing Partial Discharge Online Monitoring System

Product Overview
The OM.R921-T transformer bushing partial discharge monitoring system uses the pulse current method, coupling signals from the high-voltage side bushing's end shield grounding wire via a Rogowski coil. At the same time, it employs a comprehensive approach to effectively filter out various types of interference signals, enabling accurate and reliable detection of partial discharges occurring inside the transformer and its bushings. This real-time monitoring provides valuable insights into the transformer's operational condition, helping to guide maintenance and repair recommendations for optimal equipment performance.

System Architecture
A pulse current sensor installed on the grounding wire of the bushing end shield of the transformer couples partial discharge signals originating from inside the transformer and its bushing. This signal is transmitted via a coaxial cable to a front-end terminal box for initial conversion, after which the converted signal is sent through an optical fiber Ethernet connection to a cabinet located in the main control room. Inside the cabinet, a rear-processing unit further analyzes the incoming signal. The terminal box also features a local display unit. Finally, the processed signal is routed to an industrial PC, where it undergoes detailed analysis, computation, and handling by the background server, ultimately yielding accurate partial discharge data.

Advantageous Features
● The partial discharge monitoring system features unique and effective sensor-based directional coupling software that accurately identifies pulse characteristics and incorporates advanced anti-interference technology, enabling strong on-site interference resistance while ensuring accurate and reliable monitoring data.
● Ultra-high-speed sampling, perfectly displaying the original pulse waveform
● Advanced virtual instrument technology, featuring a PC-DAQ system architecture, delivers powerful functionality, exceptional flexibility, and easy scalability for multi-parameter monitoring and cyclical monitoring of multiple devices—plus simplified maintenance and upgrades.
● It can simultaneously monitor multiple main transformers, and system data can be transmitted over the network to a remote host computer.
● Provides real-time display, partial discharge power frequency cycle analysis, 2D and 3D spectrum analysis, trend analysis, alarm settings, historical data queries, and report generation features.
● Highly automated, enabling network access; it supports scheduled, automatic, real-time online monitoring, as well as manual query and analysis. Data can be remotely transmitted via the network, allowing for remote status monitoring, analysis, and diagnostics of equipment.
● Extensive field operation experience: The system has been successfully deployed and is running on the grid at multiple power grid companies, demonstrating stable performance, high reliability, exceptional sensitivity, and strong adaptability—plus, it’s easy to operate and maintain on-site.

System Parameters

On-site Case

Fujian Changle 220kV Offshore Wind Power Integrated Control Center Project