Dynamic performance is meant to include those events and phenomena whose characteristic frequencies or time domain ocver the range between transient conditions and steady state. Diode valves are not considered in this specification. This specification is accompanied by publications for stead-state (part 1) and transient (part 2) performance. All three aspects should be considered when preparing two-terminal HVDC system specifications. This report should not be used directly as a specification for a specific project. Does not intend to discriminate between the responsibility of users and manufacturers for the work specified.