Reliability of HVDC Converter Stations, including stations that are "back-to-back" for connection of AC systems, and DC transmission terminals. The proposed Guide will give uwers reliability design evaluation criteria, and methods for assessing the reliability of the stations. The benefit will be assessment of the relative reliability of alternate equipment and station designs, and the determination of the appropriate balance of cost and reliability for a particular application. The intended users are electric power engineers in electric utilities, engineering services firms, design/construction contractors, independent power developers, and equipment manufacturing companies. New IEEE Standard - Inactive-Reserved. Reaffirmed March 2012. This guide is intended to serve high-voltage direct current (HVDC) converter station reliability by suggesting significant objectives, design, operation, monitoring, and specification details. This guide includes the CIGRE performance protocol and reliability-related mathematical concepts.