The Calculation Of Protection For Oil Field Power System

With the development of the national economy in our country, the Power Systems are also developing rapidly and then the setting value calculation of protective relaying is becoming more and more complex. Conventional manual setting value calculation depends on individual technique of electrical worker and the reliability of which is poor. In order to enhance the reliability of protective relaying and the efficiency of setting value calculation, workers in such area are eager to believe that a practical arithmetic is a must. Thus, this dissertation researches and develops a setting value calculation system of protective relaying with computer technique.Taking example for the largest enterprise electric network in our country——Daqing oil field electric network, the analysis of 110kV and lower voltage level network is the emphasis of this dissertation. In describing"radial"network under normal condition, the viewpoint of"network model"is proposed, and a formal database of electric equipment and line parameter is made to convenience calculation and management. Then the computer algorithms are proposed in terms of the principle of dual protection setting value calculation and a setting value calculation scheme design of distribution network is made. The scheme design combines database, calculation of short circuit current with setting value calculation, successfully solves the problem how to describe and store"T"type network and parallel transmission line, etc and makes all kinds of protection match mutually. It also applies the self-adjusting principle and manual setting idea to optimize calculation and has a high bright prospect for spreading application.