Hydroelectric power station stator temperature measurement, generator rotor magnetic pole fiber optic temperature measurement, fluorescence fiber optic temperature measurement sensor

The temperature of the stator core, stator winding, and stator pressure index of a hydroelectric power station generator are important indicators that are of concern during generator operation. Their variation patterns reflect the degree of aging of the generator throughout its entire life cycle, and play a crucial guiding role in the operation and maintenance of the generator. Fiber optic temperature sensing technology is applied to measure the stator temperature of generators. Fluorescent fiber optic temperature measurement technology can accurately measure the internal temperature at different positions of the generator stator, and it also has many advantages such as insulation, high temperature resistance, corrosion resistance, electromagnetic interference resistance, and simple wiring.

The principle of fluorescence fiber optic temperature measurement is to use the characteristic of fluorescence material emitting light to coat the end of the fiber with fluorescent material. When the fluorescent material is excited by a certain wavelength of light such as ultraviolet or infrared, it radiates fluorescent energy. The energy generated by stimulated radiation of this fluorescent substance decays exponentially, and the decay time constant changes with temperature. The temperature of the measurement point can be obtained by measuring the decay time.

Compared with other temperature sensing technologies, fiber optic temperature sensing has many advantages such as corrosion resistance, electromagnetic interference resistance, low energy consumption, electrical insulation, and easy layout, which shows us the space for improving the temperature measurement accuracy of hydropower station generators. Fiber optic temperature measurement is widely used in transformers, and the technology is relatively mature. It is suitable to use fluorescent fiber optic temperature measurement when considering the operating environment of the generator during the operation of hydropower stations.

In addition, fluorescence fiber temperature measurement is a single point temperature measurement using fiber optics. The sensor has a small size, high long-term reliability, moderate price, and can not only achieve single-sided cabinet configuration, but also build a temperature monitoring system. The construction and debugging process is convenient and fast.

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