SIPROTEC 4 7SJ63 Multifunction Protection Relay - Siemens

5 Overcurrent Protection / 7SJ63CommunicationIn terms of communication, the units offersubstantial flexibility in the context of connectionto industrial and power automationstandards. Communication can be extendedor added on thanks to modules for retrofittingon which the common protocols run.Therefore, also in the future it will be possibleto optimally integrate units into the changingcommunication infrastructure, for examplein Ethernet networks (which will also be usedincreasingly in the power supply sector in theyears to come).System interface protocols (retrofittable)IEC 61850 protocolAs of mid-2004, the Ethernet-basedIEC 61850 protocol is the worldwide standardfor protection and control systems usedby power supply corporations. Siemens is thefirst manufacturer to support this standard.By means of this protocol, information canalso be exchanged directly between bay unitsso as to set up simple masterless systems forbay and system interlocking. Access to theunits via the Ethernet bus will also be possiblewith DIGSI.5Serial front interfaceThere is a serial RS232 interface on the frontof all the units. All of the unit’s functions canbe set on a PC by means of the DIGSI 4 protectionoperation program. Commissioningtools and fault analysis are also built into theprogram and are available through this interface.IEC 60870-5-103 protocolThe IEC 60870-5-103 protocol is an internationalstandard for the transmission of protectivedata and fault recordings. All messagesfrom the unit and also controlcommands can be transferred by means ofpublished, Siemens-specific extensions to theprotocol.Fig. 5/122IEC 60870-5-103: Radial fiber-optic connectionRear-mounted interfaces 1)A number of communication modules suitablefor various applications can be fitted inthe rear of the flush-mounting housing. Inthe flush-mounting housing, the modulescan be easily replaced by the user.The interface modules support the followingapplications:• Time synchronization interfaceAll units feature a permanently integratedelectrical time synchronization interface.It can be used to feed timing telegrams inIRIG-B or DCF77 format into the unitsvia time synchronization receivers.• System interfaceCommunication with a central controlsystem takes place through this interface.Radial or ring type station bus topologiescan be configured depending on the choseninterface. Furthermore, the units canexchange data through this interface viaEthernet and IEC 61850 protocol and canalso be operated by DIGSI.• Service interfaceThe service interface was conceived for remoteaccess to a number of protectionunits via DIGSI. On all units, it can be anelectrical RS232/RS485 or an optical interface.For special applications, a maximumof two temperature monitoring boxes(RTD-box) can be connected to this interfaceas an alternative.PROFIBUS-FMSPROFIBUS-FMS is an internationally standardizedcommunication system (EN 50170)for efficient performance of communicationtasks in the bay area. SIPROTEC 4 units use aprofile specially optimized for protection andcontrol requirements. DIGSI can also workon the basis of PROFIBUS-FMS. The unitsare linked to a SICAM automation system.PROFIBUS-DP protocolPROFIBUS-DP is the most widespread protocolin industrial automation. ViaPROFIBUS-DP, SIPROTEC units make theirinformation available to a SIMATIC controlleror, in the control direction, receive commandsfrom a central SIMATIC. Measuredvalues can also be transferred.MODBUS RTU protocolThis uncomplicated, serial protocol is mainlyused in industry and by power supply corporations,and is supported by a number of unitmanufacturers. SIPROTEC units function asMODBUS slaves, making their informationavailable to a master or receiving informationfrom it. A time-stamped event list is available.Fig. 5/123PROFIBUS: Fiber-optic double ring circuit1) For units in panel surface-mounting housingsplease refer to note on page 5/148.Fig. 5/124Bus structure for station bus with Ethernet andIEC 61850, fiber-optic ring5/128Siemens SIP · 2006