A NEW SETTING PROTOCOL FOR DISTANCE RELAY PROTECTION SYSTEMS IN TRANSPOSED TRANSMISSION LINES WITH UNSYMMETRICAL IMPEDANCES

Abstract The influence and the potential risk due to hidden faults of a relay protection system on power supply in distribution systems are paid more and more attention to. A probability analysis method is used to analyse fault characteristics and action mechanism of dominant faults, hidden misoperation and non-operation of the relay protection systems, and failure probability model of relay protection system is constructed and simplified. The effects of dominant faults, hidden misoperation and non-operation of the relay protection systems on the reduced power supply load power are analysed, and a probabilistic model for reduced power supply load power is constructed by three parts corresponding to dominant faults, hidden misoperation and non-operation. A probability calculation method of power supply risk occurrence due to hidden faults of relay protecttion system is proposed considering the fault probability of the relay protection systems, the frequency of the hidden faults occurring in operation period, the reduced power supply load power or load power outage, and the connection mode of the in-lines, out-lines and transformers in a substation. The feasibility and applicability of the proposed method for estimation of risk value probability of the relay protection systems is verified by two studied examples.

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Differential Equation Based Adaptive Distance Relaying Setting Method for Series Compensated Line

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1044-1045.482 ◽

2014 ◽

Vol 1044-1045 ◽

pp. 482-485

Author(s):

Jin Hu Zhang ◽

Zhen Yu Xu ◽

Zhi Peng Su

Keyword(s):

Differential Equation ◽

Transmission Lines ◽

Distance Relay ◽

Iterative Calculation ◽

Simple Simulation ◽

Simulation Results ◽

Distance Relays ◽

Distance Relaying

The distance relays of transmission lines find limitations in the presence of series compensated capacitor. One of them is the distance relay setting issue, in which either over-reach problem or under-reach problem may occur. To deal with this issue, a differential equation based adaptive distance relaying setting method for series compensated line is proposed. As for it do not need to identify whether SC/MOV is in fault loop, not need to know the parameters and the operating states of SC/MOV/GAP, and furthermore, it can be realized without the iterative calculation, it is very suitable to be used for the distance relaying adaptive setting of series compensated line. Simple simulation results certificate the proposed adaptive setting method.

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Recommendations for Main Stages Setting-up of Line Distance Relay Protection

International Journal of u- and e- Service Science and Technology ◽

10.14257/ijunesst.2015.8.5.13 ◽

2015 ◽

Vol 8 (5) ◽

pp. 147-156 ◽

Cited By ~ 1

Author(s):

Tran Hoang Quang Minh

Keyword(s):

Relay Protection ◽

Distance Relay

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Relay protection and automation of electric power systems

10.12737/1048841 ◽

2021 ◽

Author(s):

Sergey Goremykin

Keyword(s):

Power Systems ◽

Electric Power ◽

Transmission Lines ◽

Power Supply ◽

Power Transmission ◽

Relay Protection ◽

Electrical Equipment ◽

Electric Power Systems ◽

Federal State ◽

Advantages And Disadvantages

The textbook describes the main issues of the theory of relay protection and automation of electric power systems. The structure and functional purpose of protection devices and automation of power transmission lines of various configurations, synchronous generators, power transformers, electric motors and individual electrical installations are considered. For each of the types of protection of the above objects, the structure, the principle of operation, the order of selection of settings are given, the advantages and disadvantages are evaluated, indicating the scope of application. The manual includes material on complete devices based on semiconductor and microprocessor element bases. The progressive use of such devices (protection of the third and fourth generations) is appropriate and effective due to their significant advantages. Meets the requirements of the federal state educational standards of higher education of the latest generation. It is intended for students in the areas of training 13.03.02 "Electric power and electrical engineering" (profile "Power supply", discipline "Relay protection and automation of electric power systems") and 35.03.06 "Agroengineering" (profile "Power supply and electrical equipment of agricultural enterprises", discipline "Relay protection of electrical equipment of agricultural objects"), as well as for graduate students and specialists engaged in the field of electrification and automation of industrial and agrotechnical objects.

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