IEC 61325:1995

FOREWORD
SECTION 1: GENERAL
Clause
1 Scope
2 Normative references
3 Definitions
SECTION 2: INSULATORS
4 Insulator classes and type
5 Insulating materials
6 Specified characteristics and features of a d.c.
   insulator unit
7 Identification of insulators
SECTION 3: CLASSIFICATION OF TESTS, SAMPLING RULES AND
           PROCEDURES
8 Classification of tests
   8.1 Type tests
   8.2 Sample tests
   8.3 Routine tests
9 Quality assurance
10 Procedures for type and sample tests
   10.1 Insulator selection for type tests
   10.2 Sampling rules and procedures for sample tests
   10.3 Re-test procedure for the sample tests
SECTION 4: TEST PROCEDURES FOR ELECTRICAL TESTS
11 General requirements for high-voltage tests
12 Standard atmospheric conditions and correction factors
   for electrical tests
   12.1 Standard reference atmosphere
   12.2 Correction factors for atmospheric conditions
13 Mounting arrangements for electrical tests
14 Lightning impulse voltage tests
   14.1 Test procedure
   14.2 Acceptance criteria
15 Dry d.c. voltage tests
   15.1 Test procedure
   15.2 Acceptance criteria
16 SFs puncture withstand test
   16.1 Test method
   16.2 Acceptance criteria
17 Impulse overvoltage puncture withstand test
18 Ion migration test
   18.1 Reference conditions used to calculate the
        expected charge
   18.2 Test validity
   18.3 Test procedure
   18.4 Acceptance criteria
19 Electrical body resistance test
   19.1 Test procedure
   19.2 Acceptance criteria
20 Thermal runaway test
   20.1 Duration
   20.2 Procedure
   20.3 Acceptance criteria
21 Routine electrical test
SECTION 5: TEST PROCEDURES FOR MECHANICAL AND OTHER TESTS
22 Verification of the dimensions
23 Electromechanical failing load test
   23.1 Test procedure
   23.2 Acceptance criteria
   23.3 Coefficient for type tests
   23.4 Coefficients for sample tests
24 Mechanical failing load test
   24.1 Test procedure
   24.2 Acceptance criteria
25 Thermal-mechanical performance test
   25.1 Test procedure
   25.2 Acceptance criteria
26 Residual mechanical strength test
   26.1 Previous tests
   26.2 Preparation of the test pieces
   26.3 Test procedure
   26.4 Test results
   26.5 Acceptance criteria for the type test
   26.6 Acceptance criteria for the sample test
   26.7 Comparison between type and sample test results
27 Verification of the axial, radial and angular
   displacements
   27.1 Test procedure
   27.2 Acceptance criteria for cap and pin insulators
   27.3 Acceptance criteria for long rod insulators
28 Verification of the locking system
   28.1 Conformity of the locking device
   28.2 Verification of locking
   28.3 Position of the locking device
   28.4 Procedure for the operation test
   28.5 Acceptance criteria for the operation test
29 Temperature cycle test
   29.1 Test procedure for string insulator units
        composed of ceramic material
   29.2 Special test procedure for insulators with thick
        sections or very large insulators
   29.3 Complementary specifications
   29.4 Acceptance criteria
30 Thermal shock test
   30.1 Test procedure
   30.2 Acceptance criteria
31 Porosity test
   31.1 Test procedure
   31.2 Acceptance criteria
32 Galvanizing test
   32.1 Test procedures
   32.2 Acceptance criteria
33 Routine visual inspection
   33.1 Insulators with ceramic insulating parts
   33.2 Insulators with glass insulating parts
34 Routine mechanical test
35 Zinc sleeve test
   35.1 General requirements concerning the zinc sleeve
   35.2 Type test procedure
   35.3 Sample test procedure
36 Zinc collar test
   36.1 General requirements for zinc collar
   36.2 Type and sample test procedure
SECTION 6: TESTS ON STRING INSULATOR UNITS
37 General
Tables
Figures
Annexes
A - Method of comparison of the results of the
    electromechanical or mechanical failing load type
    and sample tests
B - Bibliography

Is applicable to string insulator units of ceramic material or glass for use on d.c. overhead power lines with a nominal voltage greater than 1 000 V. This standard specifies: -the characteristics of insulators; -the conditions under which the specified values of these characteristics shall be verified; -acceptance criteria