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Application of DHL waterproof displacement sensor in detection of guide vane opening of hydro-generator
Thermal power, hydropower, wind power, nuclear power and solar energy are the main sources of electric energy in China. The basic principle of hydroelectric power generation is to use water level drop and cooperate with hydro-generators to generate electricity, which is cheap and pollution-free. Power generation does not use fuel and will not produce greenhouse gases or other pollutants. The operating period of the power station is very long, and the operating cost is low. Hydropower is a good clean energy with cost competitive advantage, and it also has a good ability of peak shaving and frequency modulation, which is the basic condition to ensure the safe and stable operation of power system. The rod-type linear displacement sensor can be used in the hydro-generator speed control system to adjust the output power of the hydro-generator, and it is an important measurement and control component to ensure the safe and stable operation of the hydro-generator.
Hydraulic turbine governing system is an important control system for safe and stable operation of generating units, and the opening and closing of controllable guide vanes completes the start-up and emergency shutdown of hydraulic turbine generating units; When the unit is connected to the grid, the frequency of the power system will change due to the change of external load. The governor can monitor the frequency change in real time and control the opening of the guide vane to keep the generator set running near the rated speed and meet the requirements of primary frequency modulation of the power grid; The frequency of the power grid can be kept constant through the capacity of the unit and the adjustment rate; The output power of hydro-generator can be automatically adjusted according to the water quantity. On the premise of meeting the safety and frequency stability of power system, energy and equipment can be used reasonably, and more high-quality electric energy can be obtained at the lowest cost to ensure the economic and efficient operation of hydro-generator. According to the periodic characteristics of power system, it can generate electricity in peak period and store water in valley period, so as to improve the peaking capacity of power system.
Linear displacement sensor is used in hydro-generator speed regulation system, and its measurement accuracy, accuracy and response speed will directly affect the adjustment accuracy and comprehensive performance of the system. Principle of sensor potentiometer, its basic structure is very simple, mainly composed of resistance elements and brushes. When the displacement of the measuring rod changes, it can drive the brush to move, and output the resistance variation or voltage variation proportional to the displacement. Linear displacement sensor has the advantages of high precision, high resolution, good stability, long service life and low cost, which is especially suitable for application in hydraulic turbine governing system.
The relatively harsh service environment of hydro-generator requires high protection performance of linear displacement sensor. DHL waterproof linear displacement sensor adopts the patented multi-stage sealing technology, which greatly improves the dustproof, oil-proof and waterproof performance of the sensor, can ensure the long-term stable operation of the sensor in a relatively harsh environment without being affected, and is more suitable for the installation and use of the hydro-generator speed control system.
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