May 2020
Electricity Distribution and Electricity Transmission
Real Time Fault Level Monitoring Stage 2
NIA_SPEN_0050 RTFLM Stage 2
May 2020
May 2023
SP Energy Networks, Eastern Power Networks, London Power Networks, South Eastern Power Networks, SP Distribution, SP Manweb, SP Transmission and UK Power Networks
SP Energy Networks - Ralph Eyre-Walker. UK Power Networks - John Moutafidis.
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Network Innovation Allowance
ED - Network improvements and system operability, ED - Transition to low carbon future, ED - New technologies and commercial evolution, ET - Network improvements and system operability, ET - Transition to low carbon future and ET - New technologies and commercial evolution
Fault Level
Fault Level is already one of the greatest network challenges. The network has a safe fault level design limit which cannot be exceeded without splitting up the network, reducing the fault in-feeds or adding new equipment. Generation growth is expected to continue and accelerate as UK generation decentralises to meet net zero 2050 targets. Innovation is needed to avoid fault level becoming a barrier to the low carbon transition.

RTFLM Stage 1 project demonstrated a proof-of-concept design to measure fault level in real time.  This has been successful, with changes in network fault level registering within a number of seconds.  Two prototype devices were built with measurements taken at both 11kV and 33kV in SPEN’s SPM network.  As SPM run an interconnected network, this also demonstrated success with this network type.

RTFLM Stage 2 will extend the trials across multiple networks and network locations.  Trials will be extended to include 132kV, split board configurations, and different substation design scenarios.  SPEN also intend to undertake a combined trial with a separately NIA funded project looking at Active Network Management based on Fault Level.
-          To progress the device from a working prototype design to a fully tested and ratified device for use on the GB electricity networks.

-          Complete trials on various network configurations and demonstrate potential benefits.

-          Develop and produce a system for measuring fault level in real time across split busbar configurations

-          Develop and produce a portable “traveler” version of the device

-          Undertake a live trial combining with Active Fault Level Management (SPEN only)

-          Disseminate results to the industry
Potentially identify available capacity on the network by providing more accurate fault level assessments in real time.