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IEC 60970:2007 ED2

Insulating liquids - Methods for counting and sizing particles

Jul 16, 2007

General information

60.60     Jul 16, 2007

IEC

TC 10

International Standard

17.220.99     29.040.10  

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Scope

Describes the sampling procedures and methods for the determination of particle concentration and size distribution. Three methods are specified. One uses an automatic particle size analyser, working on the light interruption principle. The other two use an optical microscope, in either the transmitted light or incident light mode, to count particles collected on the surface of a membrane filter. The optical microscope methods are described in ISO 4407. All three methods are applicable to both used and unused insulating liquids. Annex A contains an alternative sampling procedure using a syringe and Annex B reports a reference for the calibration of automatic particle counters. The significant technical changes with respect to the previous edition are as follows: - new calibration procedures for automated laser particle; - three figures contamination code; - new procedure of sample pre-treatment when automated laser counter method are used.

Life cycle

PREVIOUSLY

WITHDRAWN
IEC 60970:1989 ED1

NOW

PUBLISHED
IEC 60970:2007 ED2
60.60 Standard published
Jul 16, 2007