Defines terms of insulation co-ordination and valve construction. Describes methods for type tests carried out to verify that the valve design will meet the specified requirements. Covers production tests carried out to verify proper manufacture. Production tests consist of routine tests (on all valves, modules or components) and sample tests (on a small number taken at random from a batch). Appendix gives guidance for the choice of test safety factor.
Applies to thyristor valves with metal oxide surge arresters directly connected between the valve terminals, for use in a line commuted commutated converter for high voltage d.c. power transmission or as part of a back-to-back link. Retricted to electrical type and production tests. Tests are based on air insulated valves.
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