Discussion on Anti-interference of Relay Protection Secondary Circuit in Power Plant

2021 ◽  
Keyword(s):  
Power Plant ◽  
Relay Protection ◽  
Secondary Circuit

An Evaluation on Corrosion Effect of Carbon Steel Using the NDT

2007 ◽  
Vol 353-358 ◽  
pp. 2411-2414
Author(s):  
Sang Ll Lee ◽  
Jin Kyung Lee ◽  
Joon Hyun Lee
Keyword(s):  
Acoustic Emission ◽  
Carbon Steel ◽  
Power Plant ◽  
Failure Mechanism ◽  
Attenuation Factor ◽  
Ultrasonic Test ◽  
Carbon Steels ◽  
Secondary Circuit ◽  
Acoustic Emission Technique ◽  
Corrosion Effect

The nuclear power plant has lots of pipes that the fluid of high temperature and high pressure flows. Among the pipe materials used at secondary circuit of the power plant the carbon steels are sensitive to corrosion due to their material properties. In this study, both ultrasonic test and acoustic emission test were used to study the corrosion effect for the carbon steel pipe nondestructively. The carbon steel specimens were in the pipe under 473K temperatures and 10MPa pressure conditions for corrosion processing. According to the degree of corrosion the strength of the specimen was evaluated, and the thickness of the corrosion specimens was also measured by using the ultrasonic wave. The experimental results showed that the attenuation factor was also increased as a depth of corrosion increased. The measured depth of the real corrosion by ultrasonic test shows the good agreement with that by an optical microscope. In order to understand the corrosion effect for the failure mechanism of carbon steel, a failure test on the specimen with various corrosion conditions was performed. An acoustic emission technique was also used to evaluate the degree of damage of corrosion specimen in real time. Acoustic emission technique is proved a useful method for on-line monitoring the microscopic failure mechanism and the damage location for the structures.

Risk Assessment of Relay Protection Setting Value in Power Plant

2013 ◽  
Vol 373-375 ◽  
pp. 1345-1348 ◽  
Author(s):  
Zong Jiang Mu ◽  
Yan Xu ◽  
Shao Bo Yan
Keyword(s):  
Risk Assessment ◽  
Power Plant ◽  
Potential Risk ◽  
Risk Evaluation ◽  
Evaluation Method ◽  
Relay Protection ◽  
Stable Operation ◽  
Protection Device ◽  
Safe Operation ◽  
Risk Assessment And Analysis

Power plant relay protection setting value of the hidden harm causes of relay protection device is not correct, safe and stable operation of the power plant. In this paper, from the angle of the safe operation of power plant, the hidden danger to plant with the protection setting is studied and then the risk evaluation method of power plant relay protection setting values of hidden trouble is proposed. From the power plant relay protection setting value considering two aspects of probability and consequences of potential outbreak of different values, value potential risk is considered, and of a certain power plant in Hubei was made the risk assessment and analysis, in order to verify the theoretical rationality and accuracy.

Research on Condition Evaluation Method of Relay Protection Based on Reliability Indices

2013 ◽  
Vol 373-375 ◽  
pp. 1509-1513
Author(s):  
Huan Ren ◽  
Yan Xu ◽  
Qing Jie Zhou
Keyword(s):  
Failure Rate ◽  
Evaluation System ◽  
Evaluation Method ◽  
Relay Protection ◽  
Protective Device ◽  
Secondary Circuit ◽  
Repair Work ◽  
Reliability Indices ◽  
Condition Evaluation

A method for condition evaluation based on reliability indices is proposed in this paper. The paper defines the reliability indices: failure rate, MTBF and availability. The condition evaluation system is proposed based on the contents of repair work and the structures of both protective device and the secondary circuit. The reliability indices are applied to evaluating the protection condition.

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