Power Equipment Online Monitoring Technology and Market Trends
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August 14 11:01:56, 2025
The importance of investing in online monitoring systems for power equipment is increasingly recognized, with strong and sustained demand expected from downstream markets. Ensuring the continuous and stable operation of electrical equipment through effective monitoring plays a critical role in enhancing the reliability and safety of power systems. As online monitoring technologies continue to advance and mature, their successful implementation in China’s power grid has transformed traditional maintenance approaches. Instead of relying on scheduled inspections, state-of-the-art condition-based maintenance has become widely accepted, marking a clear trend in modern power system management.
For many years, China's power grid has relied on periodic maintenance strategies, where equipment is inspected and maintained at fixed intervals. However, this approach often leads to unnecessary overhauls and inefficiencies. With evolving patterns of equipment defects, online monitoring solutions such as partial discharge detection, gas chromatography analysis, and SF6 quality monitoring have gained more attention. Starting from 2010, State Grid Corporation of China emphasized the need to fully implement condition-based maintenance, enhance equipment intelligence, and promote the use of smart technologies for real-time safety alerts and intelligent monitoring.
Online monitoring technology for power equipment involves systems and tools that can be directly installed on devices to continuously track their operational status. These systems typically integrate advanced sensor technology, computer processing, communication networks, expert analysis modules, and comprehensive data libraries to support accurate diagnostics.
An example of such a system includes online monitoring of capacitive devices for capacitance and dielectric loss, metal oxide surge arresters for full current and resistive current, transformer oil conditions, fiber-optic temperature, ultra-high-frequency signals, insulation resistance, and more. It also covers GIS monitoring for ultra-high-frequency signals and moisture levels, mechanical characteristics of switches, optical fiber temperature monitoring, and SF6 gas density tracking.
The investment value in power equipment online monitoring continues to grow, driven by several factors. First, state-owned grid companies are committed to implementing condition-based maintenance and building smart grids, leading to stricter reliability requirements. Online monitoring has become an essential part of this strategy. Second, there is significant potential not only in new substation construction but also in upgrading existing infrastructure. Third, the trend is shifting from individual monitoring products toward integrated substation monitoring systems. Additionally, as the number of power equipment increases and the availability of line workers decreases, the grid relies more on online monitoring to improve efficiency and reduce manual efforts.
From the perspective of State Grid Corporation’s procurement trends, the current market for online monitoring products is mainly focused on smart substations. In its smart grid planning report, State Grid has designated substation condition monitoring as a key component of smart substations. Intelligent substations can monitor major equipment and critical parameters like transformer oil chromatography, partial discharges in combined electrical appliances, and lightning arrester currents through condition monitoring units, providing essential data for grid management. Real-time status information, when analyzed by an expert system, enables initial decision-making and supports the self-diagnosis capabilities of intelligent devices within the substation.
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