Oct 2012
Electricity Transmission
Reliability Assessment of System Integrity Protection Schemes (SIPS)
NIA_NGET0019
Complete
Oct 2012
Mar 2014
National Grid Electricity Transmission
Ray Zhang
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Network Innovation Allowance
None
Protection
£125,000.00
The reliability of System Integrity Protection Schemes (SIPS) (called Operational Tripping Schemes (OTS) in National Grid) to manage circuit thermal and network stability issues, will become increasingly important, with the expansion and increased utilisation of the transmission network.

The reliability of System integrity Protection Schemes (SIPS) (called operational Tripping Schemes (OTS) in National Grid) to manage circuit thermal and network stability issues, will become increasingly important, with the expansion and increased utilisation of the transmission network.

Over the next 10 to 20 years, it is expected that the transmission system will grow and change significantly, as larger off shore renewable generation is connected, new and larger nuclear stations built to replace the existing fleet and many of the existing coal fired power stations close down. In addition, with more HVDC connections from off shore wind farms, connections to Europe and Scotland and with more use of dynamic reactive plant (such as series compensation), new system stability and circuit loading constraints could emerge. At the same time, significant substation and circuit asset renewal and upgrade programmes will take place which will require SIPS to be used more frequently used and the consequences of failure more significant.

The key objective of this project is to carry out a reliability assessment of existing System Integrity Protection Schemes (SIPS) (called Operational Tripping Schemes (OTS) in National Grid). The project will evaluate current architectures and technical solutions already deployed and the business and network impacts faced by the probabilistic risks in setting, arming and, failure to operate and mis-operation of these schemes.

This will support the development of policies and specifications to help direct future requirements for SIPS architectures, which may need to meet higher levels of security and dependability, in a more uncertain and flexible transmission network. 

This work will be successful if we deliver a reliability assessment of existing SIPS in National Grid.