PD IEC 61956:2001

Foreword
Introduction
Clause
1 General
   1.1 Scope
   1.2 Normative references
   1.3 Definitions
2 Test method 1 (plaque test)
   2.1 Principle
   2.2 Test specimen
   2.3 Test apparatus
   2.4 Test procedure (ageing test)
   2.5 Examination after ageing
   2.6 Test report
3 Test method 2 (cup test)
   3.1 Object and principle of test
   3.2 Test specimen
   3.3 Test apparatus
   3.4 Test procedure (ageing test)
   3.5 Examination of unaged and aged test specimens
   3.6 Test report
Annex A (informative) Results and discussion of robin
        tests
Figures
Bibliography

Deals with test procedures for evaluating water treeing in polyethylene (PE) and crosslinked polyethylene (XLPE) compounds, as a way of assessing their relative performance under alternating electric stress, in the presence of water. The two methods covered are: method 1, which deals with evaluating insulating materials, and method 2, which deals with evaluating insulating sandwiches which consist of insulating material in close contact with semiconducting screens.

Prescribes methods of test for the evaluation of water treeing in polyethylene (PE) and crosslinked polyethylene (XLPE) compounds, as a means to assess their relative performance under alternating (a.c.) electric stress, in the presence of water. Two methods are described, method I covering the evaluation of insulating materials alone, and method II covering the evaluation of insulating sandwiches consisting of an insulating material in intimate contact with semiconducting screens.