-
#GridAsia
Communication Issues in Distribution Automation the CESC
experience
Debasis GuptaDCE (Distribution Automation)
CESC Limited, [email protected]
www.cesc.co.in
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 2
CESC Limited - Powering Kolkata since 1899
Year ending 31.3.11
Units Sold: 8135 MU (HT 36%, LT 64%)System Met: 1657 MWT&D
Losses : 13 %Energy Generated = 7995 MUEnergy Imported = 1485
MUEnergy Exported = 110 MU
HT Consumers: 1763LT Consumers: 2.48 Million
Licensed Area: 567 Sq Kms
Installed Generation Capacity: 1225 MW
India's first fully integrated electrical utility, generating
and distributing electrical power in Kolkata and Howrah since
1899.
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 3
6 kV
11 kV
33 kV
132 kV
220 kV
Substations19 Nos
Distribution Stations100 Nos
DTs7000+
5 ImportPoints
4 CESC Gen StnsInstalled Capacity= 1225 MW
400 /230 VMV / LV
Transmission SCADA Distribution SCADA/DMS system
RMUAutomation
AMR DTs
AMR High end Tariff Meters & Street Lights
RMUs3500+
Distribution Automation Activities in CESC
Communications: WirelineFibre Optic Transmission System
Communications: WirelessGPRS/ CDMA
Excellent communications- SDH STM4- Gigabit Ethernet- CESC owns
500 Kms of OF lines
POOR throughputOK for AMR applicationsNOT yet suitable for
Feeder Automation
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 4
Working well SCADA Systems on Fibre Optic Communications
Transmission SCADA MCC Distribution SCADA/DMS MCC RTU & MDF
at a Distribution Station
PDH / SDH (STM4) Panels PDH / SDH NMS Data Centre with Gigabit
Ethernet
Mostly from Siemens, Sinaut-Spectrum, AK1703 & TM 1703 RTUs
IEC 870-5-101 & IEC-870-5-104 protocols Tight response times on
Fibre Optic Transmission Systems
CESCs own OF cables ~ 500 Kms including OPGW SDH/PDH from ABB At
35 Nodes - Fox 515, Fox 515T Gigabit Ethernet At 100 Nodes - CISCO
products
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 5
Working reasonably well AMR systems on GSM/ GPRS
Mostly from Secure Meters & Genus Majority on GPRS, some on
GSM
More than 8000 meters read at present GPRS throughputs better
than GSM, but re-runs required at times
Communicable Meters being tested Tariff Meter at HT Consumer
premises Meter Reading Setup for GSM Modems
Street Lighting AMR/ Controller Meter Reading Setup for GPRS
ModemsAMR at DTs
GPRS
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 6
Problem Area RMU (Feeder) Automation on GPRS/ CDMA
ABB Areva Schneider
Over 3500 Nos 11 kV & 6 kV RMUs commissioned in CESC network
over the last 3 years.
Installation of RMUs has reduced restoration time on HT faults
to < 1 hour:3-way and 4-way Ring Main UnitsIsolators not CBs in
legs: load-break, fault-makeFault Passage Indicators (FPIs) fitted
on all legsRestoration time of 11 kV & 6 kV Feeders already
reduced from 4 hours to less than 1 hour by installing &
manually operating the RMUs
Automation will further reduce restoration time to 15
minutes:Status of FPIs to be transmitted to SCADA/ DMSRetro-fitting
of Motors to remotely operate Isolators through SCADA/ DMS. 24V DC
Motors used.IEC-870-5-104 protocol
Issues:In CESC, all RMUs installed outdoorson roadsidesPoor,
unreliable cellular data communications
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 7
HMIClient Initiated VPN: Preferred SIMs can be from any
service
provider Security/ Encryption in our control Dynamic IPs M2M
technology used
through Internet
Service Provider Initiated VPN
HMI
SIMs must be from any ONE service provider
Security/ Encryption in Service Providers control
Static IPs no Internet needed
We have commissioned pilot projects using both options Facing
major communications issues with poor throughputs
VPN
VPN
LL
IEC 104
Static IP
FRTUModem
RMU
RMUStatic IP
RMU
Static IP
HMI
CDMA/ GPRS
VPN
M2M Server
Public Static IP
VPN
VPNVPN
IEC 104
LL
Dynamic IP
VPN
RMU
FRTUModem
RMU
Dynamic IP
RMU
Dynamic IP
Problem Area RMU (Feeder) Automation on GPRS/ CDMA
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 8
Problem Area RMU (Feeder) Automation on GPRS/ CDMA
Equipment INTERNALLY mounted Equipment EXTERNALLY mounted
SchematicDiagramIssues:
Internally mounted arrangement impracticalPoor, unreliable
cellular data communications using IEC-870-5-104 protocol
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 9
Problem Area RMU (Feeder) Automation on GPRS/ CDMA
Sample throughputs shown
Continuous efforts by all our partners to fine-tune system/
communication network
Dis-satisfied end users: we have put large-scale deployment on
hold till more reliable solutions are available
Path forward ?
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 10
Problem Area RMU (Feeder) Automation on GPRS/ CDMA
We are automating RMU clusters where possible on Fibre Optic
cables.
This will be possible only in limited locations.
RMU cluster at Writers Building area communication using Fibre
Optics
GridWeek Asia 2012
-
#GridAsia Mumbai, India Jan 16-18, 2012 11
Thank You
GridWeek Asia 2012
