IEC 60700-1-2021 Thyristor valves for high voltage direct current (HVDC) power transmission – Part 1: Electrical testing.
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.
4.1 .4 Test procedures
The tests shall be performed in accordance with IEC 60060, where applicable. The competence of testing and calibration laboratories should correspond to the ISO/IEC Guide 1 7025.
4.1 .5 Ambient temperature for testing
The tests shall be performed at the prevailing ambient temperature of the test facility, unless otherwise specified.
4.1 .6 Frequency for testing
AC dielectric tests can be performed at either 50 Hz or 60 Hz. For operational tests, specific requirements regarding the frequency for testing are given in the relevant clauses.
4.1 .7 Test reports
At the completion of the type tests, the supplier shall provide type test reports in accordance with Clause 1 6.
4.2 Atmospheric correction
When specified in the relevant clause, atmospheric correction shall be applied to the test voltages in accordance with IEC 60060-1 . The reference conditions to which correction shall be made are the following.
a) If the insulation coordination of the tested part of the thyristor valve is based on standard rated withstand voltages according to IEC 60071 -1 , correction factors are only applied for altitudes exceeding 1 000 m. Hence, if the altitude of the site a s at which the equipment will be installed is ≤1 000 m, then the standard atmospheric air pressure (b 0 = 1 01 ,3 kPa) shall be used with no correction for altitude. If a s >1 000 m, then the standard procedure according to IEC 60060-1 is used except that the reference atmospheric pressure b 0 is replaced by the atmospheric pressure corresponding to an altitude of 1 000 m (b 1 000 m );
b) If the insulation coordination of the tested part of the thyristor valve is not based on standard rated withstand voltages according to IEC 60071 -1 , then the standard procedure according to IEC 60060-1 is used with the reference atmospheric pressure b 0 (b 0 =1 01 ,3 kPa);
– Temperature: design maximum valve hall air temperature (°C).;
– Humidity: design minimum valve hall absolute humidity (g/m 3 ).
The values to be used shall be specified by the supplier.IEC 60700-1 pdf download.