1、附录： 110Kv power supply system relay protection function brief analysis Not only the 110Kv power supply system relay protection function brief analysis electrical power system security and the reliability relate electrical power system itself the movement, similarly relates in the power transmission
2、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 interior any barrier all possibly affects the overall system normal operation, thus we must complete
3、 the power supply system practically the relay protection question. First, the 11OKV power supply system Generally speaking electrical power system including the electricity generation, changes the electricity, the electric transmission, the power distribution and uses electricity and so on five lin
4、ks, between five links restricted mutually, cooperates mutually has facilitated the electrical power system 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 t
5、he 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 110Kv power supply system is in the entire electrical power system important co
6、nstituent, 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 energ
7、y safeguard duty to the power transmission scope in.Therefore the 110KV power supply system design and the movement management must observe national comprehensively the related standard and the standard, as well as correlation area specifically standard standard.In the 110Kv power supply system is c
8、ontaining a subsystems and two subsystems.Two subsystems were opposite in a subsystems are complex, violate the subsystems to include the relay protection installment, the automatic device and the secondary circuit.The relay protection installment is uses for in the power supply system to a subsyste
9、ms to carry on the surveillance, the survey, the control and the protection, is composed set of special automatic devices by the relay.The reasonable relay protection installment correct establishment to guarantees the 110Kv power supply system the normal operation to have the positive function. Sec
10、ond, the relay protection digs reads and the related principle Electrical 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 vigo
11、r 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
12、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 develop, the relay protection equipment can monitor the electrical equipment the normal work situation, and
13、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 ca
14、n cause the accident electrical equipment to excise.Response normal work situation relay protection 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 circuit or the unusual situation the el
15、ectrical 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
16、 provides the safekeeping of security for it to continue the electricity installment 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 reliabili
17、ty is to the relay protection installment performance most basic request. (2) selectivity. The selectivity is refers first by the breakdown equipment logical OR circuit itself protection excision breakdown, when the breakdown equipment logical OR circuit itself protection or the circuit breaker resi
18、st moves, only then allows by the neighboring equipment to protect, the line protection or the circuit breaker malfunction protection excision breakdown.In order to guarantee has in the coordinate request protection and the identical protection has the coordinate request two parts (for example start
19、 and trip part or block system and movement part) the selectivity to the neighboring equipment and the line, its sensitivity coefficient and the operating time, should coordinate mutually in the ordinary circumstances. (3) sensitivity. The sensitivity is refers when the equipment logical OR circuit
20、occurs by the extent of protection in the metallicity short circuit, the protective device should have the essential sensitivity coefficient, each kind of protection smallest sensitivity coefficient has the specific stipulation in the regulations.Selectivity and sensitive request, through relay prot
21、ection installation realization. (4) speed. The speed is refers to the protective device to be supposed to excise the short circuit breakdown as soon as possible, its date enhances the system stability, reduces the breakdown equipment and the line damage degree, reduces the breakdown to affect the s
22、cope, enhances automatic switches on again with the emergency power supply or the emergency apparatus automatic investment effect and so on. Third, relay protection in 11OKV power supply system Chen Ai function 1. The guarantee continues the electricity system the reliability is plays the relay prot
23、ection installment role the premise. Continues the electricity system the reliability is plays the relay protection installment role the premise.Generally speaking the relay protection reliability mainly by the disposition reasonable, the quality and the technical performance fine relay protection i
24、nstallment as well as the normal movement maintenance and the management guaranteed. 2. Relay protection in electrical power system safe operation function. The relay protection mainly has following two points in the electrical power system safe operation function: (1) safeguard electrical power sys
25、tem security.When is protected when the electrical power system part breaks down, should rapidly accurately for be separated from the breakdown part recent circuit breaker by this part relay protection equipment to send out the trip order, causes the breakdown part to interrupt promptly from the ele
26、ctrical power system, by maximum limit reduces to the electrical power system part itself damage, reduces to the electrical power system safe power supply influence, and satisfies the electrical power system certain specific requests (for example maintenance electrical power system transition condit
27、ion stable and so on). （ 2） pair of electrical power system normal work carries on the prompt.Responded the electrical equipment the normal work situation, (whether there is and different e.g. frequent attendant) does send out the signal according to the normal work situation and the equipment movem
28、ent maintenance condition, in order to the attendant carries on processing, either carries on the adjustment automatically by the equipment, either continues these to move can cause the accident electrical equipment to excise.Response normal work situation relay protection installment permission bel
29、t certain time-lag action. (3) pair of electrical power system movement carries on the monitoring.The relay protection is not merely an accident processing and the response installment, simultaneously also is monitors the electrical power system normal operation the installment. The relay protection
30、 is the electrical power system safe normal operation important safeguard, at present oneself after obtained the widespread application, along with the science and technology unceasing progress, the relay protection technology presents day by day to the microcomputer, the network, the intellectualization, protects, the control, the survey and the data communication integration development tendency.
