Hydrogen humidity exceeds the standard. When the humidity of hydrogen reaches the maximum value, the dew point temperature exceeds 5 degrees Celsius. Therefore, it is generally stipulated that the humidity of hydrogen in the generator should not be lower than -25 degrees Celsius. at the dew point temperature of -25~5, which will specifically affect the generator. The following structures will develop. Stress corrosion has three necessary conditions: material, greater stress, and a corrosive environment. When relative humidity is above 50%, the crack growth rate increases exponentially.
2. Abnormal hydrogen humidity has an impact on insulation performance.
Excessive hydrogen humidity in the generator reduces the electrical resistance of the stator insulation and easily causes short- circuits between the weak parts of the stator. isolationn. There are two weak links in the stator end insulation of the 200 MW generator: the water seal and the connection wire, both of which have high potential. If the hydrogen contains water or water vapor to a significant extent, the weak insulation layer will break and vent to other steel bars.
If the relative humidity of hydrogen exceeds a certain limit (80%), the development of stator insulation defects will be accelerated. Hydrogen has high humidity, with relative humidity above 75%, which will reduce the rotor insulation resistance and even cause startup failure.
3. Low hydrogen humidity impacts certain parts of the generator.
Low hydrogen humidity can have adverse effects on certain parts of the generator, such as pad shrinkage and support end of the stator. ring cracking, relative humidity is less than 0,5% and can be considered a dry gas.
Reference materials:
Baidu Encyclopedia - Hydrogen HumidityReference materials: < /p>Baidu Encyclopedia – Electricity Generation