Background of Technical Specifications for Substation Equipment exceeding 800 kV AC

TB 362 collates background information for UHV specifications and presents recommendations for the international specification and standardization of UHV equipment. Aspects such as insulation co-ordination (including the use of surge arresters), switching phenomena for circuit-breakers, disconnectors and earthing switches, and testing are addressed. Some subtle modifications to earlier conclusions and recommendations are incorporated in this document however these are both minor and limited.