1、HOKv power supply system relay protection function brief analysisNot only the HOKv power supply system relay protection function brief analysis electrical power system security and the rel iabi 1 i ty relate electrical power system itself the movement, similarly relates in the power transmission scope the factories and mines, the enterprise, whether the inhabitant uses electricity normally. Because simultaneously the electrical power system has the strong connectivity, electrical power system in
2、terior any barrier all possibly affects the overal 1 system normal operation, thus we must complete the power supply system practically the relay protection question.First, the HOKV power supply systemGenerally speaking electrical power system including the electricity generation, changes the electricity, the electric transmission, the power distribution and uses electricity and so on five links, between five links restricted mutually, cooperates mutually has facilitated the electrical power sys
3、tem stability together. But in fact, because these five links not always in the identical place, the identical time complete, the electric transmission must surmount the vast area, simultaneously the electrical power system must not carry on the connection with the equipment, thus strengthened its movement environment complexity, causes electrical power system the zero failure rate to guarantee with difficulty. The 1 lOKv power supply system is in the entire electrical power system important con
4、stituent, it whether safe, stable, reliable movement, not only relates the system own movement quality, whether moreover relates in its power transmission scope general user normal prompt using electricity, it the economical normal development and the society is stably taking on the important energy safeguard duty to the power transmission scope in. Therefore the 11OKV power supply system design and the movement management must observe national comprehensively the related standard and the standa
5、rd, as well as correlation area specifically standard standard. Tn the 1lOKv power supply system is containing a subsystems and two subsystems. Two subsystems were opposite in a subsystems are complex, violate the subsystems to include the relay protection instal Iment, the automatic device and the secondary circui t. The relay protection installment is uses for in the power supply system to a subsystems to carry on the surveillance, the survey, the control and the protection, is composed set of
6、 special automatic devices by the relay. The reasonable relay protection installment correct establishment to guarantees the HOKv power supply system the normal operation to have the positive function.Second, the relay protection digs reads and the related principleElectrical power system rapid development to the relay protection to propose unceasingly the new request, the electronic technology, the computer technology and the communication rapid development unceasingly has poured into the new v
7、igor for the relay protection technology development.The relay protection is refers when in the electrical power system electric power part (for example generator, line and so on) or electrical power system itself has occurred the breakdown endangers the electrical power system safe operation, can to the attendant promptly send out the warning signal, or directly to the circuit breaker which controls sends out the trip order to terminate one kind of automated protection which these events develo
8、p, the relay protection equipment can monitor the electrical equipment the normal work situation, and sends out the prompt signal differently according to the normal work situation and the equipment movement maintenance condition, in order to the attendant carries on prompt processing, either carries on the adjustment automatically by the protective device, either continues these to move possibly can cause the accident electrical equipment to excise. Response normal work situation relay protecti
9、on equipment common belt certain time-lag action.The relay protection principle of work mainly has used in the electrical power system the part has when the short circui t or the unusual si tuation the electrical quantity (electric current, voltage, power, frequency and so on) change as well as in transformer fuel tank when breakdown occurs the massive gas and the oil stream speed increase or the flowing tubing head pressure intensity increase the higher condition. The electrical power system request provides the safekeeping of security for it to continue the electricity instalIment to have following performance:(1) reliability. The reliability is refers to the protection to be supposed to move time the body should act reliably. Should not when the movement should reliable not act.The reliability is to the relay protection installment performance most basic request.(2) selectivity. The selectivity is refers first by the breakdown equipment logical OR circuit itsel
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