IEC 60700-1-2015 pdf download.Thyristor valves for high voltage direct current (HVDC) power transmission – Part 1: Electrical testing.
This part of IEC 60700 applies to thyristor valves with metal oxide surge arresters directly connected between the valve terminals, for use in a line commutated converter for high voltage d.c. power transmission or as part of a back-to-back link. It is restricted to electrical type and production tests.
The tests specified in this standard are based on air insulated valves. For other types of valves, the test requirements and acceptance criteria can be agreed.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60060, High-voltage test techniques
IEC 60060-1 , High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60071 -1 , Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60099 (all parts), Surge arresters
IEC 60270, High-voltage test techniques – Partial discharge measurements
IEC 61 803:1 999, Determination of power losses in high-voltage direct current (HVDC) converter stations
IEC 61 803:1 999/AMD 1 :201 0 1
ISO/IEC Guide 25, General requirements for the technical competence of testing laboratories 2
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1 Insulation co-ordination terms
3.1 .1 test withstand voltage
value of a test voltage of standard waveshape at which a new valve, with unimpaired integrity, does not show any disruptive discharge and meets all other acceptance criteria specified for the particular test, when subjected to a specified number of applications or a specified duration of the test voltage, under specified conditions
3.1 .2 steep front impulse
fast-front voltage impulse whose time to peak is less than that of a standard lightning impulse but not less than that of a very-fast-front voltage as defined in IEC 60071 -1
Note 1 to entry: For this standard, the steep front impulse voltage for test purposes is as shown in Figure 1 .
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.IEC 60700-1 pdf download.