Transcription of 8 Protection: Signalling and Intertripping - …
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8 Protection: Signalling and Intertripping - …
Introduction protection schemes commands requirements media, interference and noise of Signalling 8 protection : Signallingand INTRODUCTIONUnit protection schemes, formed by a number of relayslocated remotely from each other, and some distanceprotection schemes, require some form of communicationbetween each location in order to achieve a unit protectionfunction. This form of communication is known asprotection Signalling . Additionally communicationsfacilities are also required when remote operation of acircuit breaker is required as a result of a local event. Thisform of communications is known as communication messages involved may be quitesimple, involving instructions for the receiving device totake some defined action (trip, block, etc.), or it may bethe passing of measured data in some form from onedevice to another (as in a unit protection scheme).
Introduction 8.1 Unit protection schemes 8.2 Teleprotection commands 8.3 Intertripping 8.4 Performance requirements 8.5 Transmission media, interference and noise 8.6
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