Sep 2018
Electricity Distribution
EDGE-FCLi (Embedded Distributed Generation Electronic Fault Current Limiting interrupter)
Sep 2018
Mar 2022
Western Power Distribution and London Power Networks
Yiango Mavrocostanti - Western Power Distribution, Jack McKellar - UK Power Networks
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Network Innovation Allowance
ED - New technologies and commercial evolution
Fault Level and Fault Management
The ever increasing penetration of embedded generation coupled with recent improvements in network interconnectivity, have led to rising distribution network fault levels, close to the rated capability of existing equipment, and pose several challenges to both DNOs and independent power producers (IPPs). More specifically, connection requests by IPPs are often rejected by DNOs due to lack of fault current headroom in their networks. In some cases, connections are made possible through conventional resource-intensive and often disruptive network reinforcement, with substantial cost and delays to the IPPs. This leaves available generation capacity underutilised, inhibiting in this way the further decarbonisation of the network.

In order to enable a scalable and long term path for such connections, the fault current contribution from new generators needs to be reduced to near zero. While some generation sources contribute little fault current (inverter based generation like solar), synchronous ones (such as CHP) contribute significant fault current.
  • Design an 11kV FCLi for a <=5MW generator.
  • Manufacture the FCLi.
  • Perform detailed testing on the manufactured FCLi including Factory Acceptance Testing, external lab testing and ‘soak’ testing.
  • Complete Internal Arc Testing of a prototype device.
  • Provide learning and recommendations for the suitability of such a device for implementation in the distribution network.