Jun 2017
Electricity Transmission
Transmission System Fault Level Monitoring
Jun 2017
Dec 2018
Scottish and Southern Electricity Networks and Scottish Hydro Electric Transmission
SSEN Future Networks Team
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Network Innovation Allowance
ET - Network improvements and system operability
Network Monitoring
The scope of the project will include the following:
  • The development of a passive fault level monitoring programme across six transmission substations providing good coverage of the fault levels across the SHE Transmission system in the North of Scotland.
  • To compare the current transmission model and fault current calculation method (ER G74) against observed values across a range of system backgrounds from the monitoring programme by using off-line analysis.

1. Carry out an initial validation exercise to confirm the accuracy of the passive fault level estimation technique against a known active method. Should this have a positive outcome, the project will continue, with the following further objectives:
2. Implement a programme of passive fault level monitoring across the SHE Transmission system at several locations, which delivers measured fault level values collected through seasonal and other variations.
3. Carry out regular off-line calculations based on the SHE Transmission GB system model to cross check against the monitored values, delivering an improved understanding of the range of actual fault levels and the behavior of the system model, and improved confidence in decisions made on the basis of the model.

The project will be judged to be a success based on the following criteria:
  1. That sufficient evidence is collected to establish the effectiveness of passive fault level monitoring techniques within the transmission system, to enable a decision to be made on long term BAU adoption
  2. The comparisons of measured data with off-line analysis supports ongoing industry efforts to validate or improve short-circuit calculation methodologies.
  3. A specification is developed which can be used for the competitive procurement of further fault level monitoring equipment