OM.R922 High-Voltage Cable Partial Discharge Online Monitoring System

Product Overview
The OM.R922 High-Voltage Cable Partial Discharge System detects real-time partial discharge signals occurring inside high-voltage cables by installing high-frequency HFCT sensors and a partial discharge detection host on the grounding wires of cable joints and terminals. These partial discharge signals are transmitted via optical fiber to the substation monitoring server at the cable centralized control center, where an analysis system evaluates the type and level of partial discharge, assesses its impact, determines the insulation condition of the equipment, and provides corresponding maintenance and repair guidance plans.

System Architecture
Perception Layer: Localized partial discharge pulse current signals within the cable body are coupled via high-frequency HFCT sensors installed on the grounding wire of the cable joint.
Node aggregation layer: The coupled pulse signals are transmitted via coaxial cables to the front-end monitoring device, where analog signals are amplified and converted into digital format before being sent as data signals through fiber optics to the monitoring host computer.
Comprehensive Diagnostic Layer: The host monitors signals from various sensors, performing distinct analyses and calculations for each. The resulting partial discharge signal data is then written into the database. After multiple data acquisitions—typically spanning 50 power-frequency cycles—the data is retrieved from the database for spectral analysis and report generation, ultimately displayed on the background system software.

Advantageous Features
● Equipped with an open-and-close clamp-type sensor, featuring a compact design, easy disassembly and installation, and eliminating the need for power outages.
● Employs a high-performance FPGA processor to achieve high-speed sampling and storage with 100 Msps and 12-bit resolution.
● Achieve real-time filtering and simultaneously eliminate two types of interference.
● Equipped with unique synchronous acquisition technology and partial discharge localization algorithms, it can pinpoint the cable joint experiencing the most severe partial discharge.
● The combined application of band-pass filtering technology with noise identification and removal algorithms enables effective identification of partial discharge signals.
● The measurement system can monitor parameters such as the discharge amplitude, phase, and frequency of cables; it can display power-frequency cycle discharge patterns and two-dimensional discharge spectra (e.g., q-Φ, N-Φ, N-q); and it also offers features like discharge trend charts, alarm settings, historical data queries, and report printing.
● Minimum measurable discharge of 3 pC, significantly higher than the national standard of 50 pC

System Parameters

On-site Case

CNOOC Ningbo Daxie Petrochemical 220kV Substation		China National Nuclear Corporation Henan Xinyang Wuyue 500kV Pumped Storage Power Station