This paper introduces a new methodology for settings of transmission system distance protection based on an intelligent analysis of events and their consequences. The output of the proposed methodology is comprehensive distance relay settings which include not only the zone reaches and zone time delays, as in the existing approaches, but also the optimal impedance operating characteristics, the fault detection settings, and the required relay sensitivities in terms of voltage and current. The need for this methodology is the result of the increased complexity of interconnected power systems protected with a large number of relays with different relay technologies, such as electromechanical, static, and numerical as well as diversity in their operating algorithms. The relay settings are automatically updated after every major change in the state of the network topology. Since it is not possible to include all design details of the proposed system, sample design events and rules are given to illustrate the proposed methodology.

Comprehensive transmission distance protection settings using an intelligent-based analysis of events and consequences

Proper coordination of the protective relays is one of the important conditions for power system security Settings of distance relays usually determined by heuristic rules may not satisfy the coordination requirements In this paper, the coordination behaviour of the setting rules of the distance relays is investigated Coordination conditions and properties are derived and the coordination region is introduced Efficient algorithms to identify the coordination status are presented together with its test results

Intelligent approach to coordination identification in distance relaying

The Tokyo Electric Power Co. Inc. (TEPCO) and Toshiba developed an energy management system that was put into operation in December 1988. The authors review the background of developing the new system and the concept underlying the development, with the aim of improving reliability and enhancing capability. They describe the system configuration, configuration control of the distributed subsystems, and the application software. To enhance system function, two subsystems (one composed of two computers and another composed of a single computer) were planned to be installed in February 1990. One unit will analyze and access the voltage stability of the power system on a real-time basis. The other will perform the monitoring and analysis of demand characteristics by collecting information on active as well as reactive power consumption of typical users. >

New energy management system for central dispatching center of Tokyo Electric Power Co., Inc

IEEE PSRC working group on Computer Aided Coordination of Line Protection Schemes was established in 1985 to investigate the application of computers to the task of setting and verifying the setting of line protective devices. This report provides the findings of the working group regarding functional requirements of the data base, software, and hardware for this system as well as the methods of presenting the results to the protection engineer.

Computer aided coordination of line protection schemes IEEE committee report

This paper describes the implementation of a Monte Carlo based short-circuit analysis package in a hypercube parallel computer. The program generates accurate estimates of short-circuit current probability distribution curves which can be used in a variety of planning and design studies. Both network modeling aspects, such as network reduced equivalencing and mutual coupling representation, as well as the impact of the sample sizes used in Monte Carlo simulations are fully analyzed and illustrated by numerical results obtained by testing on real-world systems. These examples clearly illustrate how computational efficiency in parallel machines varies with the ratio of communication to computation (communication over head) and of the load balancing among the parallel computer processors. >

Parallel implementation of probabilistic short-circuit analysis by the Monte Carlo approach

In this paper, discussion is carried about an CRT interactive computation system of distance relay setting for back-up protection.

Interactive Computation System of Distance Relay Setting for a Large Scale EHV Power System

In this paper, discussionis carried aboutan CRT interactivecomputationsystemof distance relaysettingfor back-upprotection. This computationsystemis one of sub-systemsin- cludedin a process controlmini-computerfor automatic dispatching. The objectof system development,the hardware configuration, man-machine communication usingCRTs and lightpens, faultcalculationmethod, and fundamentalconceptand methodof relay setting are described. Also some resultsof calculationare shown.

http://ieeexplore.ieee.org/iel5/10669/4113757/04113784.pdf

T. Iwamoto

Papers

Interactive Computation System of Distance Relay Setting for a Large Scale EHV Power System

Interactivecomputationsystemof distancerelaysetting for a largescaleehv powersystem