scholarly journals Research on the Process Layer and Substation Layer Relay Protection in Smart Substation Relay Protection

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Kong Hai Bo
Keyword(s):  
Power Plant ◽  
Information Transmission ◽  
Relay Protection ◽  
Base Station ◽  
Backup Protection ◽  
Ping Pong ◽  
Variable Power ◽  
Disposable Equipment ◽  
Smart Substation ◽  
Plant Components

The intelligent substation relay protection facility is a fundamental element in construction of modern power system, based on the principles of flexibility, security and accuracy, and it can be divided into process layer and substation layer according to specific equipment. The former is suitable for individual sampling of disposable equipment, can be separated from the base station synchronization sampling, with the help of synchronous digital system and ping-pong algorithm to achieve synchronization of the overall sampling, that is to take the distribution protection components, through the separate transmission medium to realize the information transmission; the latter is for variable power plant components centralized backup protection, taking online real-time tuning technique.

scholarly journals Study on Relay Protection of Process Layer and Substation in Relay Protection of Intelligent Substation

1970 ◽  
Vol 1 (1) ◽  
Author(s):  
KONG Hai-bo
Keyword(s):  
Power System ◽  
Information Transmission ◽  
Real Time ◽  
Relay Protection ◽  
Base Station ◽  
Digital System ◽  
System Construction ◽  
Ping Pong

The relay protection facilities of the intelligent substation are the basic elements of modern power system construction. Based on the principles of flexibility, safety and accuracy, it can be divided into process layer and substation layer according to specific equipment. The former is suitable for single sampling of disposable equip-ment, which can be separated from the base station synchronization sampling, with synchronous digital system and ping-pong algorithm to achieve the overall sampling of synchronization, that is, the distribution configuration to protect the various components, through a separate transmission medium to achieve information transmission; For the substation components centralized backup protec-tion, take the online real-time tuning technology.

Human reliability in non-destructive inspections of nuclear power plant components: modeling and analysis

2019 ◽  
Vol 7 (2B) ◽  
Author(s):  
Vanderley Vasconcelos ◽  
Wellington Antonio Soares ◽  
Raissa Oliveira Marques ◽  
Silvério Ferreira Silva Jr ◽  
Amanda Laureano Raso
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Human Factors ◽  
Nuclear Power ◽  
Power Plants ◽  
Failure Modes ◽  
Cooling System ◽  
Human Reliability ◽  
Non Destructive ◽  
Plant Components

Non-destructive inspection (NDI) is one of the key elements in ensuring quality of engineering systems and their safe use. This inspection is a very complex task, during which the inspectors have to rely on their sensory, perceptual, cognitive, and motor skills. It requires high vigilance once it is often carried out on large components, over a long period of time, and in hostile environments and restriction of workplace. A successful NDI requires careful planning, choice of appropriate NDI methods and inspection procedures, as well as qualified and trained inspection personnel. A failure of NDI to detect critical defects in safety-related components of nuclear power plants, for instance, may lead to catastrophic consequences for workers, public and environment. Therefore, ensuring that NDI is reliable and capable of detecting all critical defects is of utmost importance. Despite increased use of automation in NDI, human inspectors, and thus human factors, still play an important role in NDI reliability. Human reliability is the probability of humans conducting specific tasks with satisfactory performance. Many techniques are suitable for modeling and analyzing human reliability in NDI of nuclear power plant components, such as FMEA (Failure Modes and Effects Analysis) and THERP (Technique for Human Error Rate Prediction). An example by using qualitative and quantitative assessesments with these two techniques to improve typical NDI of pipe segments of a core cooling system of a nuclear power plant, through acting on human factors issues, is presented.

Prediction of Stress Relaxation in Power Plant Components Based on a Constitutive Model

2017 ◽  
Author(s):  
Y. Kostenko ◽  
K. Naumenko
Keyword(s):  
Power Plant ◽  
Stress Relaxation ◽  
Constitutive Model ◽  
Evolution Equations ◽  
Material Behavior ◽  
Assessment Procedure ◽  
Reliable Prediction ◽  
Inelastic Material ◽  
Plant Components

Many power plant components and joint connections are subjected to complex thermo-mechanical loading paths under severe temperature environments over a long period. An important part in the lifetime assessment is the reliable prediction of stress relaxation using improved creep modeling to avoid possible integrity or functionality issues and malfunction in such components. The aim of this work is to analyze the proposed constitutive model for advanced high chromium steels with the goal of predicting stress relaxation over the long term. The evolution equations of the constitutive model for inelastic material behavior are introduced to account for hardening and softening phenomena. The material properties were identified for 9–12%CrMoV steels in the creep range. The model is applied to the stress relaxation analysis of power plant components. The results for long-term assessment, which are encouragingly close to reality, will be presented and discussed. An outlook on further developments of the model and assessment procedure is also provided.

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