Arc Protection Relay REA 10_ - APE Distribuidor ABB

Arc Protection Relay REA 10_1MRS750929-MBGOptolink communicationThe REA 101 relay contains two communicationlinks: Optolink 1 and Optolink 2.The selection switches are used to select thelinks to be used, and the messages to be communicatedbetween them.The purpose of thecommunication link is to communicateON/OFF type messages between the centralunits over the signal transfer fiber. The messagecan be:• Light signal• Overcurrent signal• Trip signalOnly one type of message per optolink can betransmitted between the central units. Thedata to be communicated depends on the systemdesign.To monitor the connection, a test pulse is sentthrough the signal transfer fiber at regularintervals. If the test pulse is not received atthe specified time, the optolink fault LED(“Optolink 1 Fault” or “Optolink 2 Fault”)and the “IRF” LED of the central unit is lit,and the IRF relay resets.Circuit-breaker failure protectionThe circuit-breaker failure protection (CBFP)is enabled, when the Trip Condition keyswitch is in “Current&Light” position.The circuit-breaker failure protection isimplemented by delaying either the HSO2output or the TRIP3 output, or when required,both the outputs. Note that if both the outputsare used, the delay time is the same, but thepick-up time of the relay (5...15 ms) is addedto the TRIP3 relay.The selection switches are used to select thewanted alternative.The selected delay time, 100 ms or 150 ms,starts running once the HSO1 is activated.Delayed tripping does not take place if theovercurrent signal disappears before the specifiedtime delay elapses.When the circuit-breaker failure protection isnot in use, all the trip outputs operate in parallel.Self-supervision unitIn addition to that mentioned in the abovesections, the self-supervision unit (IRF) monitorsthe operating voltage of the relay. If afault is detected in the operating voltages, theself-supervision unit prevents the relay fromoperating. In addition, the “IRF” LED of thecentral unit is lit, and the IRF relay resets.The self-supervision signal output operateson the closed circuit principle as presented inthe figure below. Under normal conditions,the output relay is energized and the contactgap between 8 and 10 is closed. If the auxiliarypower supply fails, or an internal fault isdetected, the contact gap between 8 and 10 isopened.IRFFig. 3Self-supervision output (IRF)10A050349Extension unit REA 103The Arc Protection Module REA 103 is anextension unit designed to be used togetherwith the central unit REA 101.The function of the REA 103 unit is to detectlight and to provide the REA 101 relay withinformation about this.The use of the extension unit allows the protectionarea to be extended and the protectedobject to be divided into smaller areasFeatures:Normal condition8910• Two sensor fibers for arc detection; loop orradial arrangement• Two signal relays for each sensor fiber• Relays activated by light detected by thesensor fiber• Two RJ-45 ports for connecting REA 101relay and extension units• Self-supervision unit monitoring operatingvoltages and sensor fiber loops.Extension unit REA 105The Arc Protection Module REA 105 is anextension unit designed to be used togetherwith the central unit REA 101.IRFFault conditionThe function of the REA 105 unit is to detectlight and to carry out tripping, if the REA 101relay provides an overcurrent signal at thesame time, or delivers a trip command.The use of extension units allows the protectionarea to be extended and the protectedobject to be divided into smaller areas. Thus amore selective system is obtained.896