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Advantages of fiber optic temperature measurement and monitoring system for hydroelectric generators

Why do hydroelectric generators need temperature measurement

In hydroelectric power plants or other nuclear power plant equipment, a generator is required. The generator applies direct current to the rotor according to the law of electromagnetic induction, drives the rotor to rotate through the mechanical part, generates electromotive force, and converts mechanical energy into electrical energy. During the operation of the generator, a large amount of heat is generated. In order to ensure the safe and reliable operation of the generator, water cooling is used for the stator bars of large generators, and hydrogen cooling is used for the stator core and rotor. Therefore, temperature components such as the generator core, upper and lower coils, and outlet water temperature need to be introduced to the monitoring system to monitor the temperature changes in various parts of the generator during operation.

With the increasing capacity of hydroelectric generator units, their importance in the power system is becoming more and more prominent. The operating temperature of the unit is an important indicator of the operation of the hydroelectric generator, especially the temperature of the stator and rotor parts can better reflect the operating situation of the unit. How to monitor the operating temperature of key components in a long-term and accurate manner has always been a concern for hydropower plants. At present, most hydroelectric power plants use platinum resistors for stator temperature measurement, but platinum resistors have weak anti-interference ability in temperature measurement. After a long operation time of the unit, the temperature measurement is inaccurate and cannot be replaced during operation or maintenance (only during the stator renovation period), becoming a permanent problem that hydroelectric power plants cannot eliminate. In order to solve its stability and durability, a certain power plant compared various temperature measurement methods and ultimately selected fluorescent fiber optic temperature measurement, which was successfully applied to the stator of a hydroelectric generator.

The generator fiber optic temperature measurement monitoring system can be connected to the generator monitoring unit software analysis system. The generator state maintenance system should provide a unified data access model and analysis diagnosis model for different equipment, including data calling and processing, monitoring and early warning, status evaluation, predictive evaluation, risk assessment, fault diagnosis and maintenance strategy, etc. At the same time, it is responsible for the installation, adjustment, calibration, testing and testing of the state monitoring system.

The fiber optic temperature monitoring system collects the temperature of the unit through temperature measuring elements embedded in the stator and rotor of the generator – sensors. The testing components include stator winding, iron core, collector ring, upper and lower pressure fingers, excitation winding, sliding ring, damping bar, etc. The data is preliminarily analyzed to form a comprehensive on-site monitoring of the equipment. The signal regulator has the ability to communicate data with the power plant computer monitoring system, meeting the software and hardware requirements of the communication interface for the power plant computer monitoring system.

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