Network Management on the Isles of Scilly Ben Godfrey Western Power Distribution Innovation and Low Carbon Networks Engineer /

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 Scheme St Mary’s Primary St Agnes – Lower Town 33kV 11kV 415V Gen Controller Synch Controller Synch Signal Bryer – The Quay 11kV 415V Gen Controller Synch Signal IoS Comms Network Synch Controller St 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 Godfrey Western Power Distribution Innovation and Low Carbon Networks Engineer / Thanks for listening