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- Protective_relay abstract "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. 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 these cases it is critical that the protective relays are properly maintained and regularly tested.".
- Protective_relay thumbnail Protective_Relays_Hydroelectric_Station.JPG?width=300.
- Protective_relay wikiPageExternalLink index.htm.
- Protective_relay wikiPageID "28691929".
- Protective_relay wikiPageRevisionID "604395016".
- Protective_relay hasPhotoCollection Protective_relay.
- Protective_relay subject Category:Relay_switches.
- Protective_relay type Artifact100021939.
- Protective_relay type Control103096960.
- Protective_relay type Device103183080.
- Protective_relay type Instrumentality103575240.
- Protective_relay type Mechanism103738472.
- Protective_relay type Object100002684.
- Protective_relay type PhysicalEntity100001930.
- Protective_relay type RelaySwitches.
- Protective_relay type Switch104372370.
- Protective_relay type Whole100003553.
- Protective_relay comment "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.".
- Protective_relay label "Distanzschutzrelais".
- Protective_relay label "Protection de distance".
- Protective_relay label "Protective relay".
- Protective_relay sameAs Distanzschutzrelais.
- Protective_relay sameAs Protection_de_distance.
- Protective_relay sameAs m.09k6f2_.
- Protective_relay sameAs Q503732.
- Protective_relay sameAs Q503732.
- Protective_relay sameAs Protective_relay.
- Protective_relay wasDerivedFrom Protective_relay?oldid=604395016.
- Protective_relay depiction Protective_Relays_Hydroelectric_Station.JPG.
- Protective_relay isPrimaryTopicOf Protective_relay.
