Manufacturer of magnetic pole temperature monitoring equipment for hydroelectric generator rotors

The best way to measure the temperature of the stator, rotor magnetic pole, and generator winding of a hydroelectric generator is to use fluorescent fiber optic temperature measurement, not thermal resistance temperature measurement, not wireless infrared temperature measurement, or gallium arsenide semiconductor temperature measurement.

Hydroelectric power generation accounts for a significant proportion in China’s energy industry. The increasing single unit capacity of hydropower units has a greater impact on the stable operation of the power grid. The stability and safe operation status of units are directly related to the safety of hydropower stations and have become important performance indicators for large and medium-sized hydropower units. A large number of facts have proven that the maintenance cost of the planned system is expensive, the maintenance time is too long, the degree of automation is low, and it cannot fully meet the growing maintenance needs of equipment. Realizing “unmanned” is the direction of modern management of power stations. How to ensure the safe and reliable operation of hydroelectric units under this management mode has been a technical problem that has been studied both domestically and internationally in recent years. Improving the pertinence of equipment maintenance, timely understanding the operating status of equipment, and improving equipment utilization are effective ways to solve this problem. Short circuit between turns of rotor winding is a common fault in generator sets. Short circuit between turns can form short circuit current, causing local overheating, reducing the reactive power of the generator, intensifying unit vibration, affecting motor life, and even burning the motor. Timely diagnosis of short circuit between turns of rotor winding is an important means to ensure the normal operation of the motor.

The magnetic poles of the rotor of a hydroelectric generator are mainly composed of an iron core, excitation winding, damping winding, upper and lower support plates, etc. The main function is to generate a magnetic field. In response to the problem of the inability to warn of inter turn short circuits in the rotor winding of a hydroelectric generator and the difficulty in finding fault points after short circuits, FJINNO has independently developed a fluorescence fiber optic monitoring system for the magnetic pole temperature of the rotor of a hydroelectric generator. The fiber optic temperature measurement system adopts a fluorescent fiber optic contact temperature measurement method to monitor the temperature of each magnetic pole in the rotor winding of a hydroelectric generator, and displays it in the form of numerical temperature. The fiber optic temperature measurement method is used to measure the temperature of the rotor. Real time temperature data was provided and analyzed. The analysis results show that the fiber optic temperature measurement system can monitor the temperature of each magnetic pole in the current rotor in real time, accurately locate the position of the magnetic pole coil with abnormal temperature in a timely manner, effectively saving time for troubleshooting and maintenance of faulty magnetic poles, improving work efficiency and economic benefits.

Insulation and unit temperature monitoring are important aspects of condition monitoring for hydroelectric generator units, which are of great significance for improving the reliability and stability of unit operation. Short circuit between turns of rotor winding is a common fault in generator sets. Short circuit between turns can form short circuit current, leading to local overheating. In the early stage of the fault, the number of short circuit turns is small, the rotor current is small, and the rotor temperature is low. Although the insulation layer is burned through, there are still small gaps that will not affect the normal operation of the unit. At the same time, the fault characteristics are not obvious, difficult to monitor in time, and are often ignored. The rotor of a hydroelectric generator is connected to the turbine through the main shaft and is an important component of the hydroelectric generator. A fluorescent fiber optic temperature measurement system is used to accurately measure the surface temperature of each rotor winding of the hydroelectric generator. It can accurately locate the faulty magnetic pole and provide real-time graphic display and data storage. The fluorescent fiber optic temperature sensor adopts a high voltage resistant, low power consumption, strong anti-interference ability, and fast response fluorescent fiber optic temperature sensor to measure and calculate the average temperature of the rotor winding.