IEC 60700-1-2021 pdf free download – 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 tests4.1.1 Evidence in lieu
Each design of valve shall be subjected to the type tests specified in this standard. If thevalve is demonstrably similar to one previously tested, the supplier may, in lieu of performinga 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 anddemonstrating how the referenced type test satisfies the test objectives for the proposeddesign.
4.1.2Test 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 valvesections 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 propermanufacture.
4.1.3Sequence of tests
The type tests specified can be carried out in any order.
NOTETests involving partial discharge measurement can provide added confidence if performed at the end of thedielectric type test programme.
4.1.4Test procedures
The tests shall be performed in accordance with lEC 60060,where applicable. Thecompetence oftestingand calibration laboratoriesshould correspondto thelsoiEc Guide 17025.
4.1.5Ambient temperature for testing
The tests shall be performed at the prevailing ambient temperature of the test facility,unlessotherwise specified.
4.1.6Frequency for testing
AC dielectric tests can be performed at either 50 Hz or 60 Hz.For operational tests, specificrequirements regarding the frequency for testing are given in the relevant clauses.
4.1.7Test reports
At the completion of the type tests， the supplier shall provide type test reports in accordancewith Clause 16.
4.2Atmospheric correction
When specified in the relevant clause, atmospheric correction shall be applied to the testvoltages in accordance with lEC 60060-1.The reference conditions to which correction shallbe made are the following.
– Pressure:
a) lf the insulation coordination of the tested part of the thyristor valve is based on standard rated withstand voltages according to lEC 60071-1,correction factors areonly applied for altitudes exceeding 1 000 m.Hence,if the altitude of the site ag atwhich the equipment will be installed is ≤1 000 m, then the standard atmospheric airpressure (b = 101,3 kPa) shall be used with no correction for altitude. lf ag >1 000 m,then the ‘standard procedure according to lEC 60060-1 is used except that thereference atmospheric pressure b is replaced by the atmospheric pressurecorresponding to an altitude of 1 0o0 m (b1o00 m);
b) lf the insulation coordination of the tested part of the thyristor valve is not based on standard rated withstand voltages according to lEC 60071-1,then the standardprocedure according to lEC 60060-1 is used with the reference atmospheric pressurebo(bo=101,3 kPa);
– Temperature: design maximum valve hall air temperature (°C).;-Humidity: design minimum valve hall absolute humidity (g/m3).The values to be used shall be specified by the supplier.
4.3Treatment of redundancy
4.3.1 Dielectric tests
For all dielectric tests between valve terminals，the redundant thyristor levels shall be shortcircuited,with the possible exception of the valve non-periodic firing test (see 8.4). Thelocation of thyristor ievels to be short circuited shall be agreed by the purchaser and supplier.IEC 60700-1 pdf download.