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EMS-SCADA PC BASED ENERGY MANAGEMENT SYSTEM

NERGY is costly and scarce thesedays and is a major concern inevery industry today, and requiresmanagement and conservation of

the available energy resources effectivelyand efficiently. Lectrotek Systems, one ofthe major players in the Indian Industriesfor process control and instrumentation,had diversified into Energy Management &Control system. Lectrotek systemss EMS-SCADA Energy Management System is asophisticated yet cost effective solutionsfor Energy Management & Control. It isbased on Distributed Control Techniquesto offer a powerful and comprehendEnergy Monitoring & Control System.

Communication System

The backbone of the system is an RS 485 data bus, which can support up to a distance of 1 km and amaximum of 31 instruments. If your system is spread beyond this distance, it can be extended by RepeaterStations. Plants/Substations in different cities can be interconnected through dedicated/non-dedicatedtelephone lines through Modems. Computers located at remote station can dial up the Energy Management

System.

EMS-SCADA Components, architectureThe following Lectrotek instruments can be connected to the EMS-SCADA (besides third party PLCs etc.):

Static Energy Meters Series 9200 and Series 2000/PM2K9200-Series instruments are 3 PHASE AC Energy Metering Instruments for stand alone use or networked(through RS 485/RS 232 Port)in a Energy Metering system. The meters are CT/PT operated and areavailable in 3-wire or 4-wire versions, 0.2/0.5/1.0 accuracy class IEC 687. Model 2000/PM2K have LEDdisplays.

STATIC TRIVECTOR METERS SPMS 2000/PM2K Series

E

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DC Current/Voltage Transducers Eltran DTI

Eltran DTI are DC transducers whichgives a 4-20 mA DC corresponding to DCvoltages. These instruments are meant forDC measurement and can accept DCsignals up to 600 VDC. It provides a 2 kVDC or peak AC between inputs, Outputs

and Power Supply. The instrument ispacked in a moulded plastic case suitablefor surface mounting.

AC Power Transducers Eltran PTW

Eltran PTW provides a 4-20 mAproportional to the AC Power input, which

can be scanned through a GenieScanner on to the Computer. Thetransducers are available in single phase,

3 phase versions for balanced loadssuitable for 3W and 4 W systems.

Other Eltran Series AC Transducers that can be connected

Eltran type Measures Input Output

Eltran CTI AC Current CT 4-20 mA DCEltran VTI AC Voltage PT 4-20 mA DCEltran FTI Frequency Mains 4-20 mA DCEltran PTV Reactive Power CT/PT 4-20 mA DCEltran PTF Phase Angle CT/PT 4-20 mA DC

RTUs connectable to the EMS-SCADA - Genie Scanner

Genie Scanners are microprocessor based units suitable for scanning, displaying, monitoring of differentsignal inputs like RTDs, Thermocouples, mA, V etc. The RS 232 Port allows to communicate with RS 485Data bus and transfer the scanned data on to the Computer.

Programmable Controllers and other third party devoces

EMS-SCADA can be connected to PLCs of select makes (ask list) to derives demand side controland alarm/trip functions such as Maximum Demand control, PF control, under/overvoltage

protection etc.

User Friendly Software

The system is made so user friendly that by just a mouse click all the parameters will be on the PC Screen.The software is menu driven for operator ease of handling and runs on Windows for NT or in Windows95/98/ME etc. operating systems. The software opens a Mimic diagram which shows the locations where allwe need electrical parameter monitoring. By clicking on a particular location of your preference, a newwindow will be opened on the PC screen which shows the following sections (on the next page):

Billing Parameters

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Feeder/load centre wise energy parameters like KWh, KVAh, Maximum Demand, and Average Power Factoretc. These can be displayed and reported on hard copy as Daily/Monthly etc. with summation/subtraction.

Instantaneous Parameters

Includes parameters RMS Voltage Phase-wise, RMS Current Phase-wise,

Frequency, KW phase-wise & Total,KVAR phase-wise & total with SeparateLead/Lag Register

Alarm annunciation/logging

Able to generate alarms for Over Current,Over Voltage, Under Voltage, PF Fault,Circuit Brake etc. And also will be able torecord time of occurrence and number oftimes. Alarms can be acknowledgedindividually or as a group.

Monitoring through Genie ScannerRTUs

Level of oil in the transformer can bechecked and will be able to generate alarms if the oil level is low. Similarly surface temperature and windingtemperature of transformer can be continuously monitored and also can generate alarms when temperaturecrosses certain limit.

Status Monitoring

The on/off status of various field instruments like switchgear, earth fault relays, brakes etc. can be monitoredby accepting potential free contact closure inputs. The off status is displayed by a color change, for quickoperator attention.

Graphs

Graphical Display of billing as well as detailed parameters or any other parameters as you prefer.Daily/Monthly graphs of half hourly/daily values of PF, Kwh, KVARh, KVA, maximum demand etc.

Electrical Single Line Diagram(SLD)

Shows a birds eye view of theplant/substation. One can click to detailedinformation of any particular feeder,incomer etc.

Reports

The PC will be continuously monitoring theparameters from different RTUs and arestored in its memory. Reports can beconfigured as Periodic or event driven.Periodic Reports can be generated atregular intervals like hour, Shift, Day,Week, Month or Year.,

Historical Data Storage, EXCEL conversion

Alarms, Events, Trends & Reports are logged into the Hard Disk as files. These files can be retrieved at anytime and can be displayed on the screen. Files are convertible to MS-EXCEL files for further use.

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Energy Management

Demand Side Management

EMS--SCADA can achieve reductions in electricity costs through automated load shedding and all users ofelectrical energy are billed according to the total amount of energy used during each billing period. Thisstandard charge is specified as cost per Kwh of electricity used. In addition to standard charges,Utilities/SEBs frequently charge a surcharge too commercial/industrial users based on the peak demandduring the billing period.

EMS SCADA provides a means to prevent new peak demand levels from being set, thus reducing the peakdemand levels from being set, thus reducing the peak demand surcharges and hence energy costs. This isalso beneficial to utilities and SEB as they can sell the saved energy to other users and also avoid equipmenttripping due to overloading.

This software provides automated KVA, KW, KVAR or Amps control through the application of onboardpredictive demand control algorithm. This is achieved by monitoring real time power consumption, calculatingload trends and predicting the total power or energy used by the end of the demand time. Automated loadcontrol ensures energy consumption is maintained within user-definable peak demand limits.

Demand control is accomplished to using PLC relay outputs, which provide maximum demand setpointcontrol functions by tripping loads selectively. Thus, for instance, as maximum demand calculations exceedconsecutive set points, output loads can be tripped in sequence as per user defined priorities of the loadsand/or automatic start up and generators to be within the demand.

Power Factor Correction

To the power distributing company/Utility, control of power factor prevents imbalances in the system and lineloss, thus saving energy. For users, abnormal power factor invite stiff penalties from the power distributingcompany/SEBs and is desirable to control.

EMS-SCADA will be able to generate relay output through PLCs to switch banks of capacitance (in differentcombination) to ensure compliance with power factor maintenance requirement of local SEB authorities.

Load Programming

Load progaraming is for load dependant load switching on/off. Control is achived by EMS-SCADA throughPLCs which switch ON/OFF equipment in accordance with user defined time.

Voltage Correction

In installation where frequent voltage fluctuations occur, voltage correction can be achieved through EMS-SCADA. Tap change in the transformer can be achieved though PLCs.

Load Frequency Alarms

Load Frequency correlation has two major primary objectives - to maintain frequency at the scheduled rate tomaintain frequency at the scheduled rate and to maintain net power interchanges with neighbouring controlareas at the scheduled values.

Customization

This software is user configurable to a great extent. This also can be totally customized according to therequirement of the end user.Owing to continuous developments, specifications/features are subject to change and upgrades without notice.

LECTROTEK SYSTEMS PVT. LTD.

9 Electronic Co-op. Estate, Satara Road, Pune-411 009.Tel. 91-20-4220313/4220383 Fax 4223932Email lspl @ vsnl.com Website www . lectrotek.com