The overall aim of this project is to quantify the potential range of TRV requirements at different voltage levels (33 kV, 132 kV, 275 kV and 400 kV) by considering the characteristics of the SPT, SPD, SPM, SHET and SHEPD networks. Based on the outcome, standard TRV requirements can then be established. Also, guidance will be formulated on how to identify cases where this standard TRV capability is insufficient and how to remedy the situation.

Objectives

The overall aim of this project is to quantify the potential range of TRV requirements at different voltage levels (33 kV, 132 kV, 275 kV and 400 kV) by considering the characteristics of the SPT, SPD, SPM, SHET and SHEPD   networks.  Based on the outcome, standard TRV requirements can then be established. Also, guidance will be formulated on how to identify cases where this standard TRV capability is insufficient and how to remedy the situation.  The aims of the project can be broken down as below:

·         Establish if the standard IEC 62271-100 TRV capabilities sufficiently cover the prospective TRV that circuit breakers will typically be subjected to in the SPT, SPD, SPM, SHET, SEPD and SHEPD networks (≥ 33 kV).

·         Investigate if SPEN and SSEN specifications should require increased TRV capabilities for any voltage level and what the enhanced rating should be.

·         Establish and provide guidelines that can be used to identify cases where the standard TRV capability is likely to be insufficient.
Investigate and report on cost-effective, practical mitigation options that could be deployed instead of installing a circuit breaker with an enhanced TRV capability.