Sep 2018
Electricity Distribution
EDGE-FCLi (Embedded Distributed Generation Electronic Fault Current Limiting interrupter)
Sep 2018
Dec 2020
Western Power Distribution
Stavros Saouros
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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.
· To successfully design, manufacture, install, integrate into the network and energise the FCLi(s).

· To choose a generator(s) and network(s) that will provide instances for which the FCLi response can be assessed.

· To avoid delays and/or circumstances that would reduce the duration of the live trial period.

· To obtain positive results demonstrating the FCLi’s correct operation during the trial so that the device’s effectiveness and functionality can be established. 

· To have sufficient data and conclusive results by the end of the trial so that significant learning and knowledge can be gained and disseminated.