This standard specifies the measurement method for the dielectric loss factor, relative capacitance, and DC resistivity of liquid insulation materials at the test temperature. This standard mainly conducts reference tests on unused liquids, but also applies to liquids in transformers, cables, and other electrical equipment in operation. However, this standard is only applicable to single-phase liquids, and simplified methods and those described in Appendix C can be used for routine measurements. For non hydrocarbon insulating liquids, other cleaning methods are required 2 Normative References: The clauses in the following documents become the clauses of this standard through reference in this standard. For dated references, All subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, all parties who have reached agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version is applicable to this standard. GB/T 1409-2006 Recommended Methods for Capacitance and Dielectric Loss Factor of Solid Insulating Materials at Power Frequency, Audio, and High Frequency (including Meter Wave Wavelength) (IEC 60250:1969, MOD) GB/T 1410-2006 Test Methods for Volume and Surface Resistivity of Solid Insulating Materials (IEC 600931980, IDT) GB/T 21216-2007 Test Method for Determining Dielectric Loss Factor by Measuring Conductance and Capacitance of Insulating Liquids (IEC 61620; 1998, IDT) IEC60475- Sampling Method for Liquid Dielectric Materials
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