The typical application of sensors is to carry out a lot of research on sensing power grid, collecting grid operation parameters, obtaining equipment operation status and protecting the stable operation of power system in the power industry. Effective and feasible sensor application solutions are proposed for important equipment and systems in power system.
The application of sensors in power grid is mainly concentrated in substation automation, power equipment condition monitoring and optical cable line fault monitoring and positioning. Voltage and current transformer and measuring unit are typical electromagnetic sensors, which mainly use Rogowski coil to measure high voltage and large current; in power plant and power station, resistance strain sensor, thermoelectric sensor and flow sensor are mainly used to realize overheat monitoring and diagnosis of generator.
In the field of power transmission and transformation, it mainly uses temperature and humidity sensor, tension sensor, three-dimensional acceleration sensor, wind speed sensor and vibration sensor to realize line state measurement; in substation system, it mainly uses magnetoelectric sensor, temperature sensor, voltage sensor and liquid level sensor to realize transformer oil measurement, core temperature measurement, closing and opening coil current monitoring Etc.
At present, the optical fiber sensor has developed a series of current measurement equipment at home and abroad, which can be used for the parameter measurement of power grid with voltage level below 500kV and current range of 35ka. Optical fiber sensors are also used in high voltage transmission network fault diagnosis. With the development of optical fiber sensing technology, the measurement of displacement, stress, strain, temperature and other physical quantities can be realized by using distributed optical fiber sensing technology. It has been applied in the condition monitoring of generator sets, large-scale transformers and switchgear in power grid.
The optical fiber transmission network online monitoring system manages and monitors all optical devices, ODF ports, optical fibers and fusion points in the joint box of the transmission network, and analyzes the performance and transmission quality of optical fiber. The vision of smart grid construction means that the information perception depth and monitoring range of power grid need to be expanded.
In addition to enhancing the original automation business, protection business and equipment operation status maintenance and other business types, the power system also needs to improve the information requirements of new functions such as management automation, operation and maintenance automation, intelligent facilities protection, intelligent fault location and three-dimensional monitoring space.