IEC 60230:2018 pdf download

IEC 60230:2018 pdf download.Impulse tests on cables and their accessories
1 Scope
This document defines the procedure for carrying out withstand lightning and switching impulse tests and withstand superimposed impulse test on cables and their accessories. This document applies solely to the methods of carrying out the tests as such, independently of the problem of selecting the test levels to be specified. The voltages pertaining to the system on which cables and accessories are to be used are given in IEC 601 83 or in the relevant product standard. This document specifies the following requirements: • the characteristics and state of the test installation and those parts of the procedure which are common to withstand tests and tests above the withstand level; • the procedure for carrying out withstand lightning and switching impulse tests and superimposed impulse test; • the procedure for carrying out tests above the withstand level which is intended for research purposes.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60060-1 :201 0, High-voltage test techniques – Part 1: General definitions and test requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in the relevant product standards and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 superimposed impulse voltage impulse voltage applied to a test object which is at the same time energized by a DC voltage Note 1 to entry: The superimposed impulse voltage falls under the definition of composite voltage given in IEC 60060-1 :201 0, 9.2.
8 Superimposed impulse voltage test
8.1 General The superimposed impulse voltage test shall be carried out on HVDC cable systems. The peak voltage level of the switching impulse is specified in the relevant product standard. When a superimposed impulse voltage test is required, Clause 8 shall be applied in addition to the other clauses of this document. 8.2 Test setup Some possibilities are given to apply an impulse voltage to a test object which is at the same time energized by a DC voltage; Annex C illustrates the possible superimposed impulse test circuit arrangements.
8.3 Time parameters The time parameters shall meet the requirements of Clause 6 or Clause 7 and shall be determined with the DC voltage source set to zero output or disconnected, i.e. without energizing the test object by a DC voltage and with the spark gap (as applicable) short-circuited. Once the time parameters have been determined, there shall be no changes to the test setup other than connecting the DC voltage source and removing the short-circuit across the spark gap. The time parameters are to be determined in this way because a base level around 0 kV is required by IEC 60060-1 . 8.4 Application of the DC voltage Before the impulses are applied to the test object, if required, the test object shall be energized by a DC voltage with a level and duration and polarity as specified in the product standard. The application of the impulses is given in Clause 1 0.
1 0 Application of the impulses
Both ends of the test object shall be connected to the impulse generator (via the spark gap or blocking capacitor in the case of a superimposed impulse test). For an impulse test, the test object shall be subjected to a series of 1 0 positive impulses and 1 0 negative impulses at the voltage and shape as specified. For a superimposed impulse test the polarity, method of application of impulses and rest periods between DC polarity changes shall be as given in the relevant product standard. As a means of conditioning the test object when using an approved measuring system, each series of 1 0 impulses may be preceded by one or more impulses of the same polarity at a level of approximately 50 %, 65 % and 80 % of the voltage and shape specified. At least the first and tenth impulses at the voltage and shape specified shall be recorded, in each series.