IEC 60970 Ed. 2.0 b:2007

Current Revision
Insulating liquids - Methods for counting and sizing particles

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Insulating liquids - Methods for counting and sizing particles

PUBLISH DATE 2007
PAGES 40

Insulating liquids - Methods for counting and sizing particles

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.
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