Sub-station Feeder Monitoring
Collects data from the different feeders of the substations and transmits to central monitoring unit
Sub-station will have both incoming and out-going feeders and have multiple meters to collect data from and transfer to central server. Linkwell Telesystems with its innovative technology has devised and successfully implemented the solution using RF and GPRS technology on sub-station feeder metering involving Data concentrator units and Meter interface units.
The methodology adopted has done away the need for modems for each of the individual feeder meters. In place of individual modems, Meter Interface units are used to interface with meter for collection of data. These MIU's have RF modules built-in to communication with DCU's. MIU's collect the data at periodic intervals and transfers over RF to DCU. One DCU can handle a maximum of 8 Meter Interface Units.
Number of DCU's depends on the number of installed feeder meters in a given sub-station . DCU has RF & GPRS modules built in to communicate with MIU over RF on one end and use GPRS for transfer of data to central server on the other end.
Solution Architecture - Using GPRS Technology
At Field/sub-station locations, design involves Meter Interface Units (MIU) which collect data from respective meters and store. As per schedule, Data Concentrator Unit (DCU) polls each MIU as configured and transfers the data to the Meter Data Management Server at the data centre. Each MIU is connected to the meter through an optical port.
- Design enables capture of feeder meter data from more than one feeder locally and transferring using a Data Concentrator unit.
- Regional(Zone/Circle/Division/Sub-Division) heirarchy in the data captured enables easy Energy Accounting.
- Wireless transfer of data between feeder meter units and Data Concentrator enables clean and trouble free installations and avoids problems due to surges in wired (CAT 5 cable) installations.
- Accurate monitoring and recording of feeder interruptions through direct interface with auxilliary contacts using I/O port in the Meter Interface Unit.
- Monitoring of Feeder supply & Interruptions
- Effective load management and supply of quality power
- Enabling decision making mechanisms through supply of data on feeder supply and quality of power
- Identification and enabling mechanism for reduction in AT&C losses