The importance of monitoring electrical equipment to ensure stable operation cannot be overstated, as it plays a crucial role in maintaining the reliability and safety of power systems. Over the years, with the continuous advancement and widespread application of online monitoring technology in China’s power system, condition-based maintenance has gradually replaced traditional periodic inspections. This shift is now widely accepted and recognized within the industry, marking a natural evolution in equipment maintenance strategies.
For many years, China's power system relied on a scheduled maintenance model, where equipment was tested and maintained at fixed intervals. However, this approach often led to unnecessary overhauls and inefficiencies. As the nature of equipment defects has evolved, online monitoring for partial discharges, chromatographic analysis, and SF6 gas quality has become increasingly important. Since 2010, the State Grid Corporation of China has emphasized the need to fully implement condition-based maintenance, enhance equipment intelligence, promote smart technologies, and achieve real-time safety alerts and intelligent monitoring of power equipment.
Online monitoring technology involves measurement and diagnostic systems that can be directly installed on power equipment to continuously record its operational status. These systems typically include advanced sensor technology, computer processing, communication networks, expert analysis tools, and a comprehensive data library. For example, in substation equipment, online monitoring covers capacitance and dielectric loss measurements, full-current and resistive current monitoring of surge arresters, transformer oil insulation monitoring, fiber-optic temperature sensing, UHF partial discharge detection, and more.
The investment value in the online monitoring field is becoming increasingly evident, with strong demand growth expected to continue. First, state-owned grid companies have set clear strategies for implementing condition-based maintenance and building smart grids, which has raised grid reliability standards. Online monitoring products are now essential components. Second, not only are new substations being built, but there is also significant potential from upgrading existing infrastructure. Third, the trend is shifting from individual product monitoring to integrated substation monitoring systems. Additionally, with the growing number of power devices and a shortage of skilled workers, grid operators rely more on online monitoring to improve efficiency and management.
From the perspective of State Grid Corporation tenders, the current market for online monitoring products is primarily focused on smart substation applications. The corporation has included substation condition monitoring systems as a key component of smart substation development in its smart grid planning. Intelligent substations can monitor critical equipment and parameters such as transformer oil chromatography, partial discharge in combined appliances, and lightning arrester currents through state monitoring units, providing essential data for grid management. Real-time status information, when analyzed by an expert system, supports initial decision-making and enables self-diagnosis capabilities in intelligent devices within the station.
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