IEC 61325 : 1.0

INSULATORS FOR OVERHEAD LINES WITH A NOMINAL VOLTAGE GREATER THAN 1000V - STRING INSULATOR UNITS OF CERAMIC MATERIAL OR GLASS FOR DC SYSTEMS - DEFINITIONS, TEST METHODS AND ACCEPTANCE CRITERIA

International Electrotechnical Committee

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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

Abstract

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. This standard specifies the characteristics of insulators; the conditions under which the specified values of these characteristics shall be verified; acceptance criteria.