Online fault detection system and method for rotating diode of AP1000 rod power supply unit

Abstract

The invention relates to the technical field of maintenance of AP1000 nuclear power station rod power supply units, in particular to an online fault detection system and method for a rotating diode ofan AP1000 rod power supply unit. The fault on-line detection system for the rotating diode of the AP1000 rod power supply unit comprises: an exciting current acquisition device which used for acquiring exciting current of the AP1000 rod power supply unit; an exciting current analysis platform which is used for acquiring the harmonic content of the acquired exciting current; and a harmonic contentfault comparison module which comprises a harmonic content fault comparison table which is used for judging whether the AP1000 rod power supply unit rotating diode has a fault or not according to theobtained harmonic content and judging the specific fault type. According to the system and the method, on the premise of not influencing the stable operation of the rod power supply unit and not changing the structure of the rod power supply unit, the fault online detection of the rotating diode of the rod power supply unit is achieved by measuring the exciting current of the rod power supply unit of the AP1000 nuclear power station and analyzing the harmonic content of the exciting current, so that the power supply reliability of the control rod of the AP1000 unit is ensured.

Description

technical field [0001] The invention relates to the technical field of maintenance of rod power units of AP1000 nuclear power plants, in particular to an online fault detection system and method for rotating diodes of AP1000 rod power units. Background technique [0002] As the key sensitive equipment of long-term nuclear power plants, the rotating diode of the AP1000 rod power unit not only withstands electrical conditions such as high current and frequent shutdown times, but also needs to withstand mechanical conditions such as large centrifugal force, large vibration, and dust accumulation, and there is a certain possibility of failure. sex. However, there is no online detection technology for the rotating diode of the rod power unit of the AP1000 nuclear power plant. [0003] At present, the fault detection method of the rotating diode of the rod power unit of the AP1000 nuclear power plant is to disassemble the end cover of the exciter after the shutdown, and measure t...

AI Technical Summary

Problems solved by technology

However, the rod power unit of the AP1000 nuclear power plant is shut down every 18 months, and the rotating diode is checked every 54 months for faults. The current detection method is obviously not time-sensitive.

[0004] At present, large-scale brushless excitation generators can use the diode non-conduction detection system to monitor the state of their rotating diodes, but due to the large difference in structure between the generator of the AP1000 nuclear power plant rod power unit and the generator of the brushless excitation generator, and Rotating diode faults have different effects on the excitation current and terminal voltage. Therefore, the existing diode non-conduction detection system cannot be used to detect the fault of the rotating diode of the AP1000 stick power unit.

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