During year 2000 CERN has installed the Electrical Network Supervisor (ENS) for the monitoring and control of the equipment of the electrical distribution network located in about 100 substations throughout the different sites. In the first phase the system has been installed in parallel with the original CERN-developed system and databases and mimic diagrams have been prepared to cover parts of the distribution network. The system has been integrated with the general ST supervision systems for alarms monitoring and measurement logging, and the data from the ENS are gradually being integrated. In the second phase an extension of the system has been tested to include a direct industrial interface with the electrical equipment without the need for the existing CERN equipment interfaces. During the 2000-2001 shutdown the supervision will be renovated in a number of zones to operate a complete industrial system covering all aspects of the supervision from equipment interfaces to end-user applications

Poulsen, S

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EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCHORGANISATION EUROPÉENNE POUR LA RECHERCHE NUCLÉAIRECERN - ST DivisionPresented at the 4th ST WorkshopChamonix, France, 30 January - 2 February 2001CERN-ST-2001-01830 January 2001ELECTRICAL NETWORK SUPERVISOR STATUS REPORTS. PoulsenAbstractDuring year 2000 CERN has installed the Electrical Network Supervisor (ENS) for themonitoring and control of the equipment of the electrical distribution network located in about100 substations throughout the different sites. In the first phase the system has been installedin parallel with the original CERN-developed system and databases and mimic diagrams havebeen prepared to cover parts of the distribution network. The system has been integrated withthe general ST supervision systems for alarms monitoring and measurement logging, and thedata from the ENS are gradually being integrated. In the second phase an extension of thesystem has been tested to include a direct industrial interface with the electrical equipmentwithout the need for the existing CERN equipment interfaces. During the 2000-2001shutdown the supervision will be renovated in a number of zones to operate a completeindustrial system covering all aspects of the supervision from equipment interfaces to end-user applications.21 INTRODUCTIONDuring the first half of year 2000 CERN installed a new SCADA system which will serve for thesupervision of the electrical distribution network. The new system was installed via a softwareinterface to the existing data acquisition system and did not require any hardware installations. Thissystem interfaces with several types of controllers and PLC types such as the MICENE system andSEPAM protection devices.It was not originally foreseen to renovate the data acquisition system, which is evolving anywayas a consequence of the electrical substation renovation programme. However, after the project wasstarted it became clear that a more complete system was needed which would also cover the dataacquisition system itself and could provide a replacement of the MICENE controller, which cannot bemaintained any longer.2 SCADA SYSTEM2.1 Data acquisitionThe new SCADA system was first installed with a software interface to the existing CERNsupervision system. The interface was designed by the supplier and implemented in a close co-operation between CERN and the supplier to provide a homogenous communication interface with 19types of controllers using five different serial protocols. The communication interface chosen is basedon an existing standardised communication protocol over TCP/IP. The interface is only responsible forthe event-driven data communication and the original CERN supervision system is still responsible forspecific controller management such as clock synchronisation, start-up configuration initialisation etc.2.2 Database configurationThe SCADA system is configured via an operational SCADA database defining the components of thesupervision system (e.g. PLC-type controllers) as well as the properties of the signals beingsupervised. This database is very general and can be applied to other domains of control than electricalnetworks. In the future it will also describe the electrical devices in terms of electrical properties andbe loosely integrated with the electrical installation and maintenance databases.An off-line “controls database” has been designed to assist with the definition of the SCADAdatabase and contains the description of the different electrical devices and their related controllers;each electrical devices is associated with its states, measurements, parameters and controls. A specialaspect of the database is the management of the interface to the MICENE controller with a descriptionof the wiring and card configuration. When new equipment is connected for supervision it is firstinserted into this database and the data is checked for correctness to facilitate the update of theoperational database. The update of the operational database is performed using an import tool whenthe data is completely defined. This procedure is illustrated in Figure 1.For each controller type (e.g. UPS system) it is decided which of the entities made available bythe controller are required for the supervision via the SCADA system. For most controllers thecomplete set of data is considered and the data attributes are defined once per type of equipment or pertype of utilisation. Most controllers have a very specific function and only one type of utilisation.Controls database(off-line)SCADA database(operational)Spread-sheetManual inputImportManual inputMinor UpdatesManual inputMajor updatesFigure 1 – Database configuration33 COMMUNICATION FRONT ENDThe new SCADA system has a distributed interface to the different controllers offeringcommunication capabilities. This is the communication Front End (FE). The FE is needed because thecontrollers installed today can only be interfaced via a serial communication link limited to a distanceof a few hundred meters without special equipment. It is estimated that about 20 of such FES arerequired to cover all electrical substations.The SCADA system was originally integrated with the existing CERN FES but a new FE hasbeen developed within the project to deal with all the different controllers in use at CERN (except theMICENE system). This FE will be based on standard hardware adapted to the potentially harshenvironment in the electrical substations. The software is designed specifically to support the existingcontrollers but new controllers can easily be interfaced if they use the same protocols and therefore itis important to standardise these. There will be a cost of integrating new controllers which use(currently) unsupported protocols and this cost should be taken into account in the overall costanalysis when purchasing new equipment.The complete set of FE driver software developed for CERN is currently undergoing SiteAcceptance Tests and only a reduced system is already installed for operational purposes in the firstrenovated substations. Later during the 2000-2001 shutdown it is planned to install up to 10 new FEcomputers. Ultimately this FE can be installed everywhere where there is no MICENE controller sincethis system will not be supported by the new FE. As a specific feature the FE can interface to severalsupervision systems and in a number of vital zones – such as the BE complex under renovation – alocal supervision display will be installed for operation in parallel with the remote SCADA systeminstalled in the TCR. This is illustrated in Figure 2.Communication Front EndConnection with SCADA (TCP/IP)Various controllers and protocolsSerial linksLocalsupervisiondisplayData Acquisition UnitsFigure 2 - Front End4 CONTROLLERSAt CERN the most important electrical general-purpose controller is the MICENE. There are up to120 MICENES installed and operational at the moment, which interface some 50000 digital signalsand measurements. The system was developed in-house for the LEP project when there was noindustrial data acquisition interface available to provide local and remote supervision of the electricalequipment. After a long period of operation there is a now a need to replace the system with modernequipment which is reliable, secure and precise.The eradication of the system will happen in two directions: Together with the substationrenovation programme the electrical devices will be equipped with communicating “intelligent”controllers and specialised PLCS thus reducing the need for the MICENES. In some cases there willstill be a need for an interface to digital and analogue signals and an industrial system – DataAcquisition Unit (DAU) - will be installed for this purpose. We will standardise on a few commonsignal types which means that special direct AC power measurements will not be supported in thefuture; instead industrial measurement devices will be used. Automation and regulation functions4which today are performed by the MICENE, will be performed by standard PLCS of the typesaccepted and operated at CERN. To reduce the cost and work required to perform these newinstallations the data quantity will be reduced significantly compared to the current situation to onlyinclude the minimum needed for operational purposes. In particular will less detailed information beacquired for non-essential low-voltage and low-consumption systems.The principles of this type of installation have been tested via a pilot project implemented in the1999-2000 shutdown and during the last months of LEP operation an 18KV substation was operatedwith this new fully industrial system. The next major installation of the system will happen togetherwith the renovation of the BE complex. This installation illustrates the principles described above:- The reactive power compensators will be controlled by a system of several PLCS. Ref. [1]- The high-voltage switch-gear will be installed with modern protection devices with integratedcommunication capabilities. Approximately 70 devices will be installed- The power measurements which are not made available by the protection devices will be acquiredby a number of specialised energy metering devices- The remaining equipment which is not completely renovated, will be equipped with DAUS forintegration with the SCADA system5 INTEGRATIONWITH THE TCR SUPERVISION INFRASTRUCTUREThe SCADA system has been integrated with the ST supervision systems via the TDS middlewaresystem based on the commercial Talarian SmartSockets® protocol. A specific software interface - theEquipment Controller (EC) - has been developed based on the infrastructure and programmingfacilities provided by the TDS project and is in operation since June, 2000. During the operation someproject specific changes have been introduced to the original SCADA system to better suit theoperational environment of the TCR and more modifications are being discussed and foreseen.A limited set of CAS alarms for the electrical network have been defined in co-operation withthe TCR. With the TCR it was decided to make just two alarms per electrical system per LHC Point,which makes less than 100 alarms per point. These alarms are groupings of equipment alarms asillustrated in Figure 3. This figure shows the SCADA alarms from “System X” (composed of fourpieces of equipment each having at least one warning) and the corresponding CAS alarm.. It has beendecided not to transmit the detailed equipment specific information to the TDS to avoid overloadingthe TCR with information. To provide the detailed information the SCADA system is available forconsultation on a dedicated console.System X - Equipment A - WarningSystem X - Equipment B - WarningSystem X - Equipment C - WarningSystem X - Equipment D - WarningDetailed SCADA Alarms – System XSystem X - WarningReduced CAS Alarm – System XFigure 3 - Reduced CAS alarmsA few measurements – primarily related to the energy consumption - which are needed outsidethe ENS are also transmitted via the TDS interface to the new TCR Event Logging System. Thephilosophy is to limit the data logging outside the ENS to the real needs of specific clients.The software installed for the TCR integration will also provide an interface from externalclients outside the ST division to the SCADA system. This may be needed when the future LHCexperiments will require limited monitoring and control of the electrical for which they are responsiblefor the operation.56 SCHEDULE6.1 Shut-down 2000-2001 activitiesDuring the shutdown of 2000-2001 the supervision system will be completely renovated in the LHCPoint 5 and BE areas in parallel with the electrical installation work. In the LHC Point 1, SM18 andMeyrin areas, where the electrical renovation has been performed in the previous years, the new FEwill be installed together with a number of DAUS to control equipment without specificcommunication capabilities. The configuration of databases and mimic diagrams for the remainingzones where no hardware installations are upgraded will continue to cover the major CERN sites andsubstations by the end of this shutdown.6.2 Long-term planningThe controllers of the LHC installation will be gradually renovated during the period 2001-2004. Upto a third of these will be removed together with the LEP dismantling and the rest will be renovatedtogether with the electrical installation of the respective LHC Points. A thorough renovation of theSPS network is also being planned to take place during this period and the controls will be upgraded inthe BA substations in parallel.7 MAINTENANCE AND HUMAN RESOURCESThe ENS project is implemented by an external supplier but CERN personnel has been involved in thedevelopment related to the integration of the SCADA system with the existing data acquisitiondevices. CERN staff and contractor personnel also perform the hardware maintenance of the existingMICENE system. The SCADA system still relies on some support from the IT and SL divisionsrelated to the original CERN-developed FES and operator terminals but this support will become lessneeded as CERN equipment is replaced with industrial equipment.In the future the supplier will perform corrective maintenance on all components of the newsystem but some limited non-corrective maintenance functions are to be performed regularly by on-site personnel. These functions include adaptive maintenance such as database updates required by theoperation and preventive maintenance primarily needed for hardware modules of the DAUS. Some ofthese interventions will be performed under the newly established contract for software support forindustrial controls. Ref. [2].8 CONCLUSION AND FUTUREThe supervision system for the electrical control is being upgraded in parallel with the electricalrenovation activities. An industrial SCADA system is the core of the ENS, which minimises thedevelopment effort, but some customisation of the standard system will always be required and cannormally be delivered with minor cost impact. In this way the system will be able to evolve and fit therequirements of the evolving electrical environment. To minimise the need for potentially expensiveand time consuming developments there will be an emphasis on standardisation of the interfaces to thesystem; however current industrial trends in substation communication technology will at some pointin time dictate important changes in the way new controllers are integrated.The operational environment within CERN and the TCR is developing as well and an effortmust be made to evolve the ENS in parallel. Some decisions must be taken regarding the distributionof supervision functionality between the specialised SCADA systems used by different equipmentgroups and the centralised TCR supervision services. The integration of different systems andarchitectures into a suitable supervision environment will be critical to the effective operationperformed by the TCR and the equipment specialists.9 REFERENCES[1] Reactive Power Regulation with PLC, G. Burdet, 4th ST Workshop, Chamonix, 2001[2] Software Support for Industrial Controls, E. Sanchez-Corral, 4th ST Workshop, Chamonix,2001

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