I.S. EN 61325:1997

FOREWORD
SECTION 1: GENERAL
  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 SF6 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
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Applies to string insulator units of ceramic material or glass for use on d.c. overhead power lines with a nominal voltage greater than 1000 V.