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- Protective_relay abstract "A relay is a device which is operated by a variation in its electrical or physical conditions to effect the operation of other devices in an electric circuit. A protective relay is a relay, the principal function of which is to protect service from interruption or to prevent or limit damage to apparatus. In electrical engineering, a protective relay is a device designed to trip a circuit breaker when a fault is detected. The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over- and under- frequency. Microprocessor-based digital protection relays now emulate the original devices, as well as providing types of protection and supervision impractical with electromechanical relays. Electromechanical relays provide only rudimentary indications of involved phase and zone targets. In many cases a single microprocessor relay provides functions that would take two or more electromechanical devices. By combining several functions in one case, numerical relays also save capital cost and maintenance cost over electromechanical relays. However, due to their very long life span, tens of thousands of these \"silent sentinels\" are still protecting transmission lines and electrical apparatus all over the world. An important transmission line or generator unit will have cubicles dedicated to protection, with many individual electromechanical devices, or one or two microprocessor relays.The theory and application of these protective devices is an important part of the education of an electrical engineer who specializes in power systems. The need to act quickly to protect circuits and equipment as well as the general public often requires protective relays to respond and trip a breaker within a few thousandths of a second. In some instances these clearance times are prescribed in legislation or operating rules. A maintenance or testing program is used to determine the performance and availability of protection systems.Based on the end application and respective user geography, there are various standards such as ANSI C37.90, IEC255-4, IEC60255-3, IAC, etc. that govern the response time of the relay to the fault conditions that may occur.".
- Protective_relay thumbnail Protective_Relays_Hydroelectric_Station.JPG?width=300.
- Protective_relay wikiPageID "28691929".
- Protective_relay wikiPageLength "28687".
- Protective_relay wikiPageOutDegree "23".
- Protective_relay wikiPageRevisionID "707371303".
- Protective_relay wikiPageWikiLink ANSI_device_numbers.
- Protective_relay wikiPageWikiLink Category:Relays.
- Protective_relay wikiPageWikiLink Circuit_breaker.
- Protective_relay wikiPageWikiLink Current_transformer.
- Protective_relay wikiPageWikiLink Electric_power.
- Protective_relay wikiPageWikiLink Electrical_engineering.
- Protective_relay wikiPageWikiLink Electromagnetic_induction.
- Protective_relay wikiPageWikiLink Galileo_Ferraris.
- Protective_relay wikiPageWikiLink Galvanometer.
- Protective_relay wikiPageWikiLink International_Electrotechnical_Commission.
- Protective_relay wikiPageWikiLink Magnetic_circuit.
- Protective_relay wikiPageWikiLink Magnetism.
- Protective_relay wikiPageWikiLink Overcurrent.
- Protective_relay wikiPageWikiLink Power_engineering.
- Protective_relay wikiPageWikiLink Reed_relay.
- Protective_relay wikiPageWikiLink Relay.
- Protective_relay wikiPageWikiLink SCADA.
- Protective_relay wikiPageWikiLink Switch.
- Protective_relay wikiPageWikiLink Transistor.
- Protective_relay wikiPageWikiLink Vacuum_tube.
- Protective_relay wikiPageWikiLink File:Protective_Relays_Hydroelectric_Station.JPG.
- Protective_relay wikiPageWikiLink File:Protective_relay.jpg.
- Protective_relay wikiPageWikiLinkText "Differential Protective Relay".
- Protective_relay wikiPageWikiLinkText "Distance Relay".
- Protective_relay wikiPageWikiLinkText "Distance relays".
- Protective_relay wikiPageWikiLinkText "Protective device".
- Protective_relay wikiPageWikiLinkText "Protective relay".
- Protective_relay wikiPageWikiLinkText "protective relay".
- Protective_relay wikiPageWikiLinkText "protective relays".
- Protective_relay wikiPageWikiLinkText "relays".
- Protective_relay wikiPageUsesTemplate Template:Main.
- Protective_relay wikiPageUsesTemplate Template:R.
- Protective_relay wikiPageUsesTemplate Template:Refimprove.
- Protective_relay wikiPageUsesTemplate Template:Reflist.
- Protective_relay wikiPageUsesTemplate Template:See_also.
- Protective_relay subject Category:Relays.
- Protective_relay hypernym Device.
- Protective_relay type Device.
- Protective_relay type Switch.
- Protective_relay type Thing.
- Protective_relay comment "A relay is a device which is operated by a variation in its electrical or physical conditions to effect the operation of other devices in an electric circuit. A protective relay is a relay, the principal function of which is to protect service from interruption or to prevent or limit damage to apparatus. In electrical engineering, a protective relay is a device designed to trip a circuit breaker when a fault is detected.".
- Protective_relay label "Protective relay".
- Protective_relay seeAlso Power-system_protection.
- Protective_relay sameAs Q503732.
- Protective_relay sameAs Distanzschutzrelais.
- Protective_relay sameAs رله_حفاظتی.
- Protective_relay sameAs Protection_de_distance.
- Protective_relay sameAs रक्षी_रिले.
- Protective_relay sameAs m.09k6f2_.
- Protective_relay sameAs Reläskydd.
- Protective_relay sameAs Rơ_le_bảo_vệ.
- Protective_relay sameAs Q503732.
- Protective_relay sameAs 保护继电器.
- Protective_relay wasDerivedFrom Protective_relay?oldid=707371303.
- Protective_relay depiction Protective_Relays_Hydroelectric_Station.JPG.
- Protective_relay isPrimaryTopicOf Protective_relay.