Research and Application on Successive Action Zone and Dead Zone of Transverse Differential Protection in Parallel Lines

2014 ◽  
Vol 556-562 ◽  
pp. 1614-1617
Author(s):  
Nan Nan Gao ◽  
Ying Pei ◽  
Jie Zhan ◽  
Hong Bo Li ◽  
Lin Niu
Keyword(s):  
Dead Zone ◽  
Relay Protection ◽  
Stable Operation ◽  
Differential Protection ◽  
Analysis Software ◽  
Regional Networks ◽  
Parallel Lines

This paper deeply researches on successive action zone and dead zone of transverse differential protection in parallel lines, and improves the existing analysis software for relay protection action. First determine which zone the fault point belongs to, and then analyze the protection action according to the different zone concretely. This improvement will greatly increase the accuracy to analyze the relay protection action, and will be significant to the safe and stable operation of regional networks.

Design and Application of Analysis Software for Relay Protection Action Based on PAS

2014 ◽  
Vol 543-547 ◽  
pp. 766-769
Author(s):  
Nan Nan Gao ◽  
Lin Niu ◽  
Ying Pei ◽  
Hong Bo Li ◽  
Jie Zhan
Keyword(s):  
Expert System ◽  
Relay Protection ◽  
Distance Protection ◽  
Analysis Software ◽  
Regional Networks ◽  
Backup Protection ◽  
Phase Current ◽  
Three Phase ◽  
Zero Sequence ◽  
Design And Application

This paper applies the theory of expert system to analysis for relay protection action based on PAS. And it also summarizes various rules according to the experience of operating personals and relay protection personals for several years. All these rules are suitable for 110kV and 66kV regional networks. This paper not only analyzes three-phase current protection, zero-sequence current protection, distance protection etc, but also discusses some special situations such as under voltage lockout over-current protection for transformer, remote backup protection etc.

Simulation Design of Transformer Differential Protection Based on Mat Lab

2013 ◽  
Vol 722 ◽  
pp. 282-286
Author(s):  
Hong Hua He
Keyword(s):  
Simulation Model ◽  
Relay Protection ◽  
Fault Current ◽  
Differential Protection ◽  
Protection Device ◽  
Simulation Design ◽  
Transformer Protection ◽  
Internal Fault ◽  
Simulation Results ◽  
Transformer Differential Protection

The microprocessor-relay protection device has gradually replaced regular simulation relay protection it is also difficult to visually determine protection device malfunction or tripping. Therefore, the use of the Mat lab toolbox to build transformer differential protection simulation model, the simulation results show that two-line ratio brake can correctly identify internal fault current, and rapidly remove fault, and the system also can provide convenient for microprocessor transformer protection.

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.

Study on Relay Protection Technology in Power System

2014 ◽  
Vol 521 ◽  
pp. 414-417 ◽  
Author(s):  
Yong Zhang
Keyword(s):  
Power System ◽  
Power Transmission ◽  
Simulation Analysis ◽  
Digital Simulation ◽  
Relay Protection ◽  
Simulation Models ◽  
Stable Operation ◽  
Transformer Protection ◽  
Depth Analysis ◽  
Protection Technology

Relay protection devices for safe and stable operation of the power system plays a vital role. In this thesis, the transformer protection principles, in-depth analysis of the various protection principles and constitutes a transformer, transformer protection built digital simulation model protection methods, and transformers of various simulation models for simulation analysis, the study showed that a new type of power system protection technology can effectively guarantee the safety performance of the power transmission system.

Research and Summary on Reliability of Relay Protection System

2012 ◽  
Vol 433-440 ◽  
pp. 6755-6759
Author(s):  
Jing Jing Zhang
Keyword(s):  
Power System ◽  
Telecommunication Network ◽  
Operation Mode ◽  
Relay Protection ◽  
Electric Power System ◽  
Protection System ◽  
Input Circuit ◽  
Stable Operation ◽  
Automatic Equipment ◽  
Research Survey

In electric power system, relay protection system can powerfully safeguard secure and stable operation of the first circuit equipment; it’s an important task to ensure reliable operation of protection system. Research on reliability of it now arises much attention at home and abroad. The paper carries out detailed research survey on reliability of relay protection system, which contains AC input circuit, digital relay protection equipment and operation output circuit. In general it also contains automatic equipment and telecommunication network etc. It belongs to repairable system; state-space method and fault-tree method are main analysis methods. Each protection has its own principle and structure, the modeling of which is different. The paper discusses the reliability modeling and index system of protection system from three aspects, whose failure models are hardware and software construction, main protection and backup protection construction and construction with relation to operation mode of power system. With the vigorous development of DG in smart grid, the prospects of reliability evaluation of wide area adaptive protection system are presented.

scholarly journals Analysis of Electromagnetic Compatibility of Microprocessor Relay Protection and Automation Devices

2021 ◽  
pp. 12-15
Author(s):  
Elena Zenina ◽  
Keyword(s):  
Power System ◽  
Electric Power ◽  
Electromagnetic Compatibility ◽  
Relay Protection ◽  
Electric Power Industry ◽  
Power Industry ◽  
Power Balance ◽  
Stable Operation ◽  
Special Role ◽  
Protection Devices

In the modern conditions of the development of the electric power complex, relay protection and automation devices play a special role related to protection against possible damage resulting from violations of normal operating modes, both of individual elements and the entire power system as a whole. This, in turn, directly affects the reliable and stable functioning of the main power elements and electrical equipment. Damage to the power part of the equipment of an electric grid complex can be caused by changes in the main parameters of the normal mode: a change (increase) in currents leads to overloads and, in the limit, to short circuits, a decrease in voltage leads to an avalanche of voltage and disruption of the operation of electric motors connected to the damaged section, and an increase in voltage leads to overvoltages in certain sections. In addition, violations associated with a decrease in the transmitted active power lead to a change in frequency, and a violation of the reactive power balance leads to a change in voltage in certain sections, which generally leads to noncompliance with the power balance and loss of stable operation of the power system. The main reasons for failures in operation, false and excessive triggering of microprocessor relay protection devices are considered. The main ways of solving the problem of electromagnetic compatibility in the electric power industry are identified. A solution is proposed to improve the reliability of the operation of microprocessor relay protection devices and the way of development of the problem of electromagnetic compatibility in the electric power industry is shown.

Hardware Design of Microcomputer Relay Protection Device Based on ARM&DSP

2013 ◽  
Vol 706-708 ◽  
pp. 814-817
Author(s):  
Li Xia Zuo ◽  
Rong Guang Di
Keyword(s):  
Electromagnetic Compatibility ◽  
Communication Protocol ◽  
Hardware Design ◽  
Relay Protection ◽  
Stable Operation ◽  
Protection Device ◽  
Hardware Circuit ◽  
Microcomputer Relay Protection

In order to ensure electrical railway’s safe and stable operation, a kind of microcomputer feeder protection device based on a double "ARM+DSP" CPU framework is designed. The hardware design can not only Improve protection performance, but also realize IEC61850 communication protocol. According to electromagnetic compatibility and anti-interference requirements, the whole hardware circuit is designed in detail, the debugging effect is good and can fully meet the demand of the system.

scholarly journals Generalized Proportional Model of Relay Protection Based on Adaptive Homotopy Algorithm Transient Stability

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 899 ◽  
Author(s):  
Feng Zheng ◽  
Jiahao Lin ◽  
Jie Huang ◽  
Yanzhen Lin
Keyword(s):  
Power Systems ◽  
Transient Stability ◽  
Relay Protection ◽  
Information Value ◽  
Normal Operation ◽  
Stable Operation ◽  
Operation Condition ◽  
Homotopy Algorithm ◽  
Newton Homotopy ◽  
Monitoring Information

Relay protection equipment is important to ensure the safe and stable operation of power systems. The risks should be evaluated, which are caused by the failure of relay protection. At present, the fault data and the fault status monitoring information are used to evaluate the failure risks of relay protection. However, there is a lack of attention to the information value of monitoring information in the normal operation condition. In order to comprehensively improve monitoring information accuracy and reduce, a generalized proportional hazard model (GPHM) is established to fully exploit the whole monitoring condition information during the whole operation process, not just the monitoring fault condition data, with the maximum likelihood estimation (MLE) used to estimate the parameters of the GPHM. For solving the nonlinear equation in the process of parameter estimations, the adaptive homotopy algorithm is adopted, which could ensure the reversibility of the Jacobi matrix. Three testing cases have been reviewed, to demonstrate that the adaptive homotopy algorithm is better than traditional algorithms, such as the Newton homotopy algorithm, regarding the calculation speed and convergence. Therefore, GPHM could not only reflect the real time state of the equipment, but also provide a sound theoretical basis for the selection of equipment maintenance types.

Analysis on Commutation Failure and DC Differential Protection Unwanted Action of Yunnan-Guangdong UHVDC

2013 ◽  
Vol 446-447 ◽  
pp. 784-789
Author(s):  
Hui Fan Xie ◽  
Guang Yuan Yang ◽  
Guang Qiang Peng ◽  
Xiao Peng Chen ◽  
Yan Zhou Chen ◽  
...  
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
Failure Process ◽  
Stable Operation ◽  
Differential Protection ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Commutation Failure ◽  
Dc Current ◽  
Differential Current

In order to reveal the commutation failure process and the reason for DC differential protection (87DCM) unwanted action of Yunnan-Guangdong UHVDC in 9.12th 2012, and to lessen the unnecessary outage and guarantee a safe and stable operation, the 9.12 outage is deeply studied, including commutation failure phenomena and equivalent circuit analysis, high voltage DC current, low voltage DC current and their differential current analysis and reason for 87DCM unwanted action, and the final conclusions come out that: (1) 9.12 commutation failure includes V1 failing to communicate to V3 of Y bridge and V2 failing to communicate to V4 of D bridge; (2) during commutation failure process, high voltage DC current and low voltage DC current all raise rapidly and both contain DC component, AC component and no-circle rising component, and theoretically high voltage DC current equals to low voltage DC current; (3) failure in low pass filter circuit of pole 1 low voltage CT leads to measuring differential current between high voltage and low voltage DC current, and finally leads to unwanted action of 87DCM.

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