IEC 60343:1991 pdf download

IEC 60343:1991 pdf download.Recommended test methods for determining the relative resistance of insulating materials to breakdown by surface discharges.
IEC 60343 concerns endurance tests with surface discharges. It is intended to assess the relative resistance of solid insulating materials to breakdown when exposed to surface discharges.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards.
A cylinder of 6 mm leave a 1 mm radius. be normal to the su materials, a gap not specimen is permitted
± 0,3 mm diameter with the This electrode with a mass rface of the specimen and exceeding 100 pm between to avoid possible mechanical
sharp edge removed to not exceeding 30 g shall rest upon it. With soft this electrode and the damage.
It is convenient to introduce very thin specimens 100 pm) between electrodes fixed 100 pm apart.
(thickness less than
When necessary to reduce specimen capacitance and minimize thermal heating, cylindrical electrodes of less than 6 mm are permissible provided the radius of the electrode edge is maintained at 1 mm.
Figure 1 shows examples of two electrode arrangements which may be used. The arrangement shown in figure lb avoids the electrode being
The test is normally carried out on specimens without applied strain but specimens may be subjected to mechanical strain during exposure to discharges, either by applying tension or by bending sheet specimens over a curved plate electrode. Where mechanical strain is applied, 0,5 % deformation shall be used for rigid materials and 5 % for flexible materials.
Tests shall normally be made in air dried to a relative humidity not exceeding 20 % (relative humidity of 20 % or less can be obtained by passing the air through a drying column containing a suitable desiccant such as CaCl2).
The degree of dryness of the air and its rate of flow across the upper surface of the specimens shall be sufficient to ensure that under the test conditions the measured life is not influenced by local concentrations of degradation products (a flow rate of 0,5 1/mm per specimen has frequently been found satisfactory).
The test apparatus shall satisfy the criteria in clause 4.
Prepare the test specimen as described in 4.2 and place it on or between the electrodes as described in 4. 1. Using electrical apparatus satisfying the requirements of clause 5, apply a voltage between the electrodes. Measure the surface discharges by any one of the procedures described in IEC 270.
The specification of the test conditions shall include the following:
a) whether a full type test or a routine acceptance test is required;
b) the method for the measurement of specimen thickness;
c) the number of specimens to be tested at each voltage, if greater than nine.IEC-60343-1991

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