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Network Management on the Isles of Scilly
Ben GodfreyWestern Power DistributionInnovation and Low Carbon Networks Engineer01332 827447/[email protected]
The Isles of Scilly
• 40 km off Lands End
• 5 inhabited
• Only these 5 have electricity supplies
• Population approximately 2000 people
• Supplies by a 33kV undersea cable from the mainland
• 11kV submarine cables interconnect and feed the islands
• 64 substations with a mix of overhead and underground network
• Back up diesel generation to secure supplies
Electrical Network
LV monitoring has been installed on the 64 substations supplying customers
Network Management Project
Battery
Broadband over Powerline Modem
Rack-mounts for Radios
RCDs
Heater
Serial acquisition device
Smart Meter
Main Supply& Battery Changeover
AC/DC Converter
Main Fuses
TCP/IP-based network which uses three technologies:
• GE SD4 radios – 400MHz – 19.2kbps• GE Entranet radios – 2.4Ghz – 106kbps• PPC Broadband over Powerline – BPL –
50Mbps
A 150Mbps microwave link connects to the mainland
Communications Backhaul
Typical Radio Sites
Typical BPL Sites
• Trending of individual substation in NMS
• Metered values stored on a central server
• Greater visibility of asset capacity and utilisation
• Enables automation roll-out
• Comparison of communication systems
Benefits
• 2 x 200kVA peak diesel generators have been installed on both St Agnes and Bryer
• FG Wilson P200-2 generators with ComAp InteliGen-NT controllers
• Remote control and additional automation installed
• Star-Star transformers installed to provide HV neutral earth
Generator Installation
Proposed SchemeSt Mary’s Primary
St Agnes – Lower Town
33kV
11kV11kV 415V
Gen Controller
Synch Controller
Synch Signal
Bryer – The Quay
11kV 415V
Gen Controller
Synch Signal
IoS CommsNetwork
Synch ControllerSt Buryan Primary
33kV
11kV
Mainland Comms Network
• Automated blackstart restoration
• Ability to switch over to generator supply and back without short interruptions
• Reduce issues with frequency control on a weakly connected network
• Allow a larger amount of embedded generation without introducing frequency oscillation issues
Key Benefits
Ben GodfreyWestern Power DistributionInnovation and Low Carbon Networks Engineer01332 827447/[email protected]
Thanks for listening