For a long time, China’s power system has implemented a periodic maintenance system for power equipment, that is, testing and maintenance of equipment according to the planned time period. This has the disadvantages of overhaul and overhaul. With the new changes in the form of power equipment defects, on-line monitors have begun to increase for on-line monitoring of partial discharges, chromatographic, and quality discharge counters. State Grid Corporation of China clearly stated that it is necessary to fully promote the implementation of equipment condition maintenance from 2010 onwards, comprehensively increase the level of equipment intelligence, promote the application of intelligent equipment and technologies, and realize online safety warning and intelligent monitoring of equipment.
The online monitoring technology of power equipment refers to the measurement and diagnosis systems and technologies that can be directly installed on the power equipment to record the characteristics of the equipment's operating status in real time. The online monitor is generally composed of advanced sensor technology, computer and information processing technology, communication system, expert analysis system and a relatively complete system data information library.
Take the primary arrester on-line monitor and discharge counter of the primary substation of a substation as an example, there are: on-line monitoring of the capacitance and dielectric loss of the capacitive device; on-line monitoring of the full-current and resistive current of the metal oxide arrester; Monitoring, on-line monitoring of optical fiber temperature measurement, on-line ultra high-frequency on-line monitoring, pipe placement, dielectric loss on-line monitoring, online monitoring of dynamic characteristics of on-load switch; GIS UHF Board on-line monitoring, micro-water on-line monitoring; switch Mechanical characteristics monitoring and on-line monitoring of optical fiber temperature of switchgear, on-line monitoring of gas density of electrical equipment, etc.
The value of investment in the field of power equipment on-line monitoring has been highlighted, and the high downstream demand for arrester on-line monitors and discharge counters can be maintained. First, the strategy for state-owned power grid companies to implement state maintenance and build smart grids has been determined, and grid reliability requirements have become more stringent. On-line monitoring of products has become an indispensable and important component; second, in addition to newly-increased transformer substations, there are even more existing stock transformations. Large space; Third, arrester on-line monitor and discharge counter have the trend from the single product monitoring to the substation integrated monitoring system development. In addition, with the increase in power equipment and the shortage of line workers, the power grid needs to rely on on-line monitoring of products to improve management.
Source: China Electric Network http://
Judging from the State Grid Corporation's tendering situation, the current market for arrester on-line monitors and discharge counters is mainly concentrated in the substation of the smart grid. State Grid Corporation of China has also made the status monitoring system of substations an important part of smart substations in the smart grid planning report. The intelligent substation can realize on-line monitoring of major equipment and important parameters such as transformer oil chromatography, partial discharge of the combination electric appliance, and full current of lightning arrester through the state monitoring unit, and provides basic data support for grid equipment management. The real-time status information can be used to make initial decisions after analysis and processing by the expert system to implement the self-diagnosis function of intelligent devices in the station.