IEC 60700-1 :2015 pdf download – Thyristor valves for high voltage direct current (HVDC) power transmission – Part 1: Electrical testing.
3.1.3 internal and external insulation air external to the components and insulating materials of the valve, but contained within the profile of the valve or multiple valve unit is considered as part of the internal insulation system of the valve Note 1 to entry: The external insulation is the air between the external surface of the valve or multiple valve unit and its surroundings. 3.1.4 valve protective firing means of protecting the thyristors from excessive voltage by firing them at a predetermined voltage 3.2 Valve construction terms 3.2.1 valve support that part of the valve which mechanically supports and electrically insulates from earth the active part of the valve which houses the valve sections Note 1 to entry: A part of a valve which is clearly identifiable in a discrete form to be a valve support may not exist in all designs of valves. 3.2.2 valve structure physical structure holding the thyristor levels of a valve which is insulated to the appropriate voltage above earth potential 3.2.3 redundant thyristor levels maximum number of thyristor levels in a thyristor valve that may be short-circuited externally or internally during service without affecting the safe operation of the thyristor valve as demonstrated by type tests, and which if and when exceeded, would require shutdown of the converter to replace the failed thyristors or acceptance of increased risk of failures 3.2.4 valve base electronics electronic unit, at earth potential, which is the interface between the control system for the converter and the thyristor valves
3.3 Terms related to type tests NOTE Those tests which are carried out to verify that the valve design will meet the requirements specified. In this standard, type tests are classified under two major categories: dielectric tests and operational tests. 3.3.1 dielectric tests tests which are carried out to verify the high voltage characteristics of the valve 3.3.2 operational tests tests which are carried out to verify the turn-on, turn-off and current related characteristics of the valve 3.4 Terms related to production tests NOTE Those tests which are carried out to verify proper manufacture, so that the properties of a valve correspond to those specified. 3.4.1 routine tests production tests which are carried out on all valves, valve sections or components 3.4.2 sample tests production tests which are carried out on a small number of valves, valve sections or components taken at random from a batch 4 General requirements 4.1 Guidelines for the performance of type tests 4.1.1 Evidence in lieu Each design of valve shall be subjected to the type tests specified in this standard. If the valve is demonstrably similar to one previously tested, the supplier may, in lieu of performing a type test, submit a test report of a previous type test for consideration by the purchaser. This should be accompanied by a separate report detailing the differences in the design and demonstrating how the referenced type test satisfies the test objectives for the proposed design.
4.1.2 Test object Test object should meet the following requirements: a) Certain type tests may be performed either on a complete valve or on valve sections, as indicated in Table 2. For those type tests on valve sections, the total number of valve sections tested shall be at least as many as the number in a complete valve. b) The same valve sections shall be used for all type tests unless otherwise stated. c) Prior to commencement of type tests, the valve, valve sections and/or the components of them should be demonstrated to have withstood the production tests to ensure proper manufacture. 4.1.3 Sequence of tests The type tests specified can be carried out in any order. NOTE Tests involving partial discharge measurement can provide added confidence if performed at the end of the dielectric type test programme.