Sepam - HV/MV Protection and control units (ENG) - Trinet

I onA V/Hz W/ϕ Wh clear alarm resetI onO offO offMERLIN GERINA V/Hz W/ϕ Wh clear alarm resettriptripMERLIN GERINTime tagging of eventsPresentationThe Sepam 2000 communication system time tagsthe data processed by Sepam 2000. The time taggingfunction assigns a date and precise time to statuschanges so that they can be accurately classifiedwith respect to time.Time tagged data can be processed in the controlroom by the remote monitoring and control systemvia Jbus communication protocol for data loggingand chronological reports.Sepam 2000 time tags the following data:c logical inputs,c internal remote annunciation bits,c information pertaining to Sepam 2000 equipment(see Sepam check-word at Jbus address 0C8Fh),c oscillating status of logical inputs and KTS bits inorder to avoid saturation of the monitoring and controlsystem in the event of abnormally frequent statuschanges.At the time of commissioning, the user enablesthe logical inputs and the KTS that he wishes to timetag in Sepam 2000 using the setting terminal.Time tagging of these events is disabled by default.Chronological sorting of the time tagged events isperformed by the remote monitoring and controlsystem.Time taggingSepam 2000 time tagging uses absolute time (see section on date and time). Whenan event is detected, it is tagged with the absolute time given by Sepam 2000’sinternal clock.All the Sepam 2000 internal clocks must be synchronized so as to avoid drifts and toallow inter-Sepam 2000 chronological sorting.Sepam 2000 has two mechanisms for managing its internal clock:c time setting:for initializing or modifying the absolute time. A special Jbus message, called “timemessage”, is used to time-set each Sepam 2000,c synchronization:to avoid Sepam 2000 internal clock drifts and ensure inter-Sepam 2000synchronization.Internal clocks can be synchronized according to two principles:c internal synchronization:via the Jbus communication network without any additional cabling,c external synchronization:via a logical input with additional cabling.At the time of commissioning, the user sets the synchronization mode parameterusing the setting terminal.Jbus communicationSepam 2000 is always the slave with respect to the Jbus master, which means thatthe master station reads the events that are stored in Sepam 2000.Time tagged events are transferred between Sepam 2000 and the master by 4-eventblocks.A special acknowledgment procedure is used for data exchanges.Example of architecture“internal synchronization via the communication network” architecture.master computerSepam 2000Jbus/ModbusnetworkSepam 2000Architecture for “internal synchronization via the communication network”Jbus/Modbus communication19