I. Overview
BHG-IOM-L refers to the high-voltage cable partial discharge (insulation) on-line monitoring system produced by Haoguang Electrical.
※ Host Monitor: Refers to the core component of the system that collects, processes, and displays real-time environmental data transmitted by sensors, with the model being BHG-IOM-L.
Partial discharge: Refers to the electrical discharge phenomenon caused by uneven distribution of charges in the insulating medium of a power plant, leading to continuous accumulation and release of charges in localized areas of the insulating medium, where only a partial region between conductors is punctured (not through the conductor between which the voltage is applied).
※ Displacement sensor: BHGCT sensor with a type of BHGCT-C2000, installed in cable ground and receiving high-frequency pulse current signals generated by partial discharge of high-voltage cables during local discharge.
※ Power Frequency Phase Sensor: Through-core mounted on the cable to sense the time point of the AC zero crossing rising edge, providing the partial discharge main unit with a phase signal at 0 point, so that the data collection phase starts from 0 point, model BHGGP-T2000. ※ Host Computer: Refers to the computer installed with the upper driver software of this system, used for communication with the monitoring host, to synchronize display the field monitoring data in the control room or remote dispatch center, and to control the remote monitoring computer of the field equipment.
Digital Filtering: Utilizing custom filter programs written in software, digital signal processing is employed to retain only the specified frequency components, offering great flexibility compared to analog filtering.
Discharge Rate: The stable apparent discharge charge that appears within the measurement time.
The necessity of installing an online monitoring system for installation.
High-voltage cables are prone to gradual degradation of insulation performance during long-term operation due to factors such as raw materials, production processes, assembly techniques, and changes in external environments. This degradation can lead to reduced insulation performance and localized discharge phenomena. If localized discharge is not promptly detected and necessary emergency measures are not taken, the further decline in insulation performance may eventually result in cable insulation breakdown, causing major safety incidents such as power outages and explosions. The high-voltage cable partial discharge (insulation) online monitoring system, by installing sensors at cable joints, collects partial discharge signals, transmits them to the signal processing host, where multiple sensor node information is processed and analyzed uniformly, and early warnings are issued for nodes experiencing discharge. It can continuously predict cable conditions without interruption, preventing failures caused by insulation degradation and providing crucial assurance for the reliable operation of cables.
II. System Overview and Basis for the Development of This System
1. System Overview
BHG-IOM-L High Voltage Cable Partial Discharge (Insulation) On-line Monitoring System is a new generation, high-performance digital on-line partial discharge monitoring device developed by Haoguang Electrical based on years of field experience in partial discharge measurements. It employs sensor technology, signal processors, computers, and algorithms. The system utilizes partial discharge sensors and monitoring instruments that have been tested and proven in numerous substation and power stations over a long period.
Professional, intelligent, seeking common ground, and innovation-period operation tests (both indoor and outdoor) have consistently been reliable and stable. Furthermore, some products have been found in the field to have discharge faults in monitored equipment, which has prevented major accidents from occurring. Proven through practical application, the products provided by this system fully meet the on-site environmental requirements.
Insulation Monitoring Device
