Super Conducting Fault Current Limiters Dr Geraldine Bryson Future Networks Technical Manager

Connecting the North West £8 billion of network assets 5 million 2.4 million 25 terawatt

Location 33/11kV primary substation at Bamber Bridge in Lancashire

Bamber Bridge Primary s/s Site details BS 33kV T2 11kV 11/4.2kA 22/8.4kA Transformers upgraded  Switchgear rated 150MVA @ 11kV  Make 19.7kA peak Break 7.87kA rms

Bamber Bridge Primary s/s Solution – Fit SCFCL T1 BS 33kV T2 11kV 11/4.2kA 11 + I lim peak =18.7 I lim peak = 7.7 4.2 +I lim rms = 7.5 I lim rms = 3.3

Policy development No existing policies or procedures Ensure SCFCL did not reduce reliability of existing protection scheme Ensure any faults external to Bamber Bridge could be managed Satisfy normal operating parameters and not undermine confidence in SCFCL Ensure the SCFCL did not reduce the reliability of the existing protection scheme at Bamber Bridge Ensure that any faults external to Bamber Bridge could be managed according the Security of Supply Standards Design a protection scheme that would satisfy the normal network operating parameters and would not cause spurious trips to undermine confidence in the SCFCL

Network Protection Scheme Protection Installed T1 BS 33kV T2 11kV Directional OC/EF Unit Differential Bus Bar Blocking 7

Systems Integration Overview of SCFCL

Installation Site installation

Commissioning Site commissioning

Learning points (1) Installed proof of concept Used our installation to make DNO ready Not intended to operate for a fault ASL proved long-term stability Commissioned for a few months only Parts from Bamber Bridge used to build SPEN unit

Learning points (2) Issue with noise Very cold winter Unbalanced load Compressor bolted to container caused excessive vibration Design altered to bolt to concrete plinth Very cold winter Inlet water temperature too cold Unit tripped Unbalanced load Issue with noise Compressor initially bolted to container Caused excessive vibration Altered design to bolt to concrete plinth Very Cold Winter Inlet water temperature too cold Unit tripped Unbalanced load Section A and B not equally loaded Caused current flow through device Caused heating and unit tripped Re-configure network Section A and B not equally loaded Caused current flow through device Caused heating and unit tripped Re-configure network

QUESTIONS & ANSWERS

Thank you for your time and attention Want to know more? futurenetworks@enwl.co.uk www.enwl.co.uk/thefuture 0800 195 4141 @ElecNW_News linkedin.com/company/electricity-north-west facebook.com/ElectricityNorthWest youtube.com/ElectricityNorthWest geraldine.bryson@enwl.co.uk e e Thank you for your time and attention