TAMILNADU ELECTRICITY BOARD ,

WIRELESS COMMUNICATION AT

CHENNAI CITY

FOR AUTOMATION OF ELECTRICITY

DISTRIBUTION

Wireless communication link Details

CHALLENGES• Communication involves long distances communication at 400 MHz and 900 MHz frequency band.• Achieving Operating frequency redundancy for the project• Wireless link should be reliable, as continuous monitoring and controlling should be done in order to

maintain load distribution.

SYSTEM INTEGRATION DETAILS:• Prime Bidder: Siemens, Mumbai, India• Wireless installation: Sheetal wireless Tech. Pvt. Ltd.• End customer: TamilNadu Electricity Board Chennai, India• Type of system: Point to multipoint communication.(1 Master and 17 remote locations).• Operating frequency: 400 and 900 MHz• Operating frequency: 400 and 900 MHz• Maximum distance between locations: 18 Km without repeater.

PROJECT DETAILS:• Master Station has Computers with SCADA running on it. A 8 port RS232 multiplexer is used to

accumulate all remote station data. Master station communicates to remote stations within Chennaicity via 16 radio modems (8 radios with 400 MHZ and 900 MHz).

• At Master Station, Operating frequency Redundant System (Devices operating in 400 MHz and 900MHz are used.) is designed.

• System is designed with 8 wireless links operating at 400 MHz frequency and another 8 linksoperating at 900 MHz at Master station . If any of the link goes down the other link fetch the datafrom remote 17 locations.

• Remote locations consist of two radio modems with two antennas placed on the tower

AntennaAssembly

900 MHzOmni

Directional Antenna

400 MHzOmni

directional Antenna

AntennaAssembly

Master Control Station SCADA

MASTER STATION SYSTEM SCHEMATIC

400 MHz 8 No of

Radio ModemMake : MDSModel: 4701

900 MHz 8 no of

Radio ModemMake : MDSModel : 9701

Serial connections terminated

to Fiber optic Converter

Fiber optic to serial communication converters

Fiber optic Cable for 250 Meters

RS 2328 – PortMultiplexer

REMOTE LOCATION SYSTEM SCHEMATIC

400 MHz Directional Antenna Assembly

400 MHz Radio ModemMake MDS-

Co-axial cable

900 MHz Directional Antenna Assembly

Make MDS-Model - 4701

900 MHz Radio ModemMake MDS-Model - 9701

RS 232 Serial cable Assembly

Tower with required heightAt each location

Siemens RTU Model : TM 1703Protocol: ABB proprietary

ABB

RTU

LOCATION LAYOUT

CONTACT

Sheetal Wireless Technologies Pvt. Ltd.

Pune-411038, Maharashtra, INDIA

Mob: 09730069940

Ph. 91-20-25422941 / 25467179 / 64007732

sales@sheetalwireless.com