AS 1137.3-1981

1 - AS 1137.3-1981 INSULATORS - PORCELAIN AND GLASS INDOOR AND OUTDOOR STATION POST INSULATORS (FOR VOLTAGES GREATER THAN 1000 V
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE.
6 - 1.2 VALUES OF VOLTAGES.
6 - 1.2.1 System Nominal Voltage.
6 - 1.2.2 System Highest Voltage.
6 - 1.2.3 Test Voltages.
6 - 1.3 DEFINITIONS.
6 - 1.3.1 System with effectively earthed neutral
6 - 1.3.2 System with non-effectively earthed neutral
6 - 1.3.3 Post insulator
6 - 1.3.4 Post insulator unit
6 - 1.3.5 Outdoor post insulators or post insulator units
6 - 1.3.6 Indoor post insulators or post insulator units
6 - 1.3.7 Batch
6 - 1.3.8 Flashover
6 - 1.3.9 Puncture
6 - 1.3.10 Puncture voltage
6 - 1.3.11 Dry impulse withstand voltage
6 - 1.3.12 50 percent impulse flashover voltage
6 - 1.3.13 Dry or wet power-frequency withstand voltage
6 - 1.3.14 Dry or wet power-frequency flashover voltage
7 - 1.3.15 Mechanical failing load
7 - 1.3.16 Creepage distance
7 - 1.3.17 Protected creepage distance
7 - 1.4 CLASSIFICATION OF INSULATORS.
7 - 1.5 CLASSIFICATION OF TESTS.
7 - 1.5.1 Group I Tests-Type Tests.
7 - 1.5.2 Group II Tests-Batch Tests.
7 - 1.5.3 Group III Tests-Routine Tests.
7 - 1.6 STANDARD CONDITIONS FOR TEST.
8 - SECTION 2. INSULATOR REQUIREMENTS
8 - 2.1 MECHANICAL DESIGN.
8 - 2.1.1 General.
8 - 2.1.2 Precautions in Design and Manufacture.
8 - 2.1.3 Porcelain Insulators.
8 - 2.1.4 Glass Insulators.
8 - 2.2 CEMENT.
8 - 2.3 METAL FITTINGS.
8 - 2.4 PROTECTION OF FERROUS METAL PARTS AGAINST CORROSION
8 - 2.5 HEIGHT.
8 - 2.6 ALIGNMENT OF FITTINGS.
8 - 2.7 FIXING ARRANGEMENTS.
8 - 2.8 MARKING.
8 - 2.9 TESTS.
8 - 2.9.1 General.
8 - 2.9.2 Group I Tests-Type Tests.
9 - 2.9.3 Group II Tests-Batch Tests.
9 - 2.9.4 Group III Tests-Routine Tests.
10 - SECTION 3. STANDARD CHARACTERISTICS
10 - 3.1 APPLICATION.
10 - 3.2 POWER-FREQUENCY TEST WITHSTAND VOLTAGES.
10 - 3.3 IMPULSE WITHSTAND TEST VOLTAGES.
10 - 3.4 CREEPAGE DISTANCES.
10 - 3.5 MECHANICAL CHARACTERISTICS.
13 - SECTION 4. GENERAL REQUIREMENTS FOR TESTS
13 - 4.1 ARRANGEMENT OF INSULATORS FOR ELECTRICAL TESTS.
13 - 4.1.1 Condition of the Insulator.
13 - 4.1.2 Mounting.
13 - 4.2 IMPULSE TESTS.
13 - 4.3 POWER-FREQUENCY TESTS.
13 - 4.4 TIME INTERVALS BETWEEN FLASH-OVERS.
13 - 4.5 ATMOSPHERIC CONDITIONS FOR TEST.
13 - 4.5.1 General.
13 - 4.5.2 Correction of Test Voltages for Atmospheric Conditions
14 - SECTION 5. GROUP I TESTS-TYPE TESTS
14 - 5.1 GENERAL.
14 - 5.1.1 Arrangement.
14 - 5.1.2 Conduct of Tests.
14 - 5.1.3 Records.
14 - 5.1.4 Number of Tests.
14 - 5.2 IMPULSE TESTS.
14 - 5.2.1 Requirements.
14 - 5.2.2 Impulse Withstand Voltage Tests.
14 - 5.2.3 50 Percent Dry Impulse Flashover Test.
14 - 5.3 POWER-FREQUENCY VOLTAGE ONE-MINUTE DRY WITHSTAND TEST AND DRY FLASHOVER TEST.
14 - 5.3.1 Test Conditions.
14 - 5.3.2 Dry Withstand Test.
14 - 5.3.3 Dry Flashover Test.
14 - 5.4 POWER-FREQUENCY VOLTAGE ONE-MINUTE WET WITHSTAND TEST AND WET FLASHOVER TEST.
14 - 5.4.1 General.
14 - 5.4.2 Wet Withstand Test.
15 - 5.4.3 Wet Flashover Test.
15 - 5.5 RADIO-INFLUENCE VOLTAGE TEST (RIV)
15 - 5.6 CORONA-EXTINCTION VOLTAGE TEST
15 - 5.7 MECHANICAL STRENGTH TEST.
15 - 5.7.1 General.
15 - 5.7.2 Bending Test.
15 - 5.7.3 Torsion Tests.
15 - 5.7.4 Tensile or Compressive Test.
15 - 5.8 TEST FOR DEFLECTION UNDERLOAD.
16 - SECTION 6. GROUP II TESTS-BATCH TESTS
16 - 6.1 GENERAL.
16 - 6.1.1 Sampling.
16 - 6.1.2 Test Sequence.
16 - 6.1.3 Retests.
16 - 6.1.4 Tested Insulators Not to be Used.
16 - 6.2 VERIFICATION OF DIMENSIONS.
16 - 6.2.1 General.
16 - 6.2.2 Measurement of Height and Parallelism of Faces
16 - 6.2.3 Measurement of Eccentricity.
16 - 6.3 TEMPERATURE CYCLE TEST.
17 - 6.3.1 Test Applicable to Post Insulator Units of Porcelain or Toughened Glass
17 - 6.3.2 Test Applicable to Post Insulators or Post Insulator Units of Annealed Glass
17 - 6.3.3 Quantity of Water.
17 - 6.4 MECHANICAL STRENGTH TEST.
17 - 6.5 POWER-FREQUENCY PUNCTURE TEST
17 - 6.6 POROSITY TEST
17 - 6.7 THERMAL SHOCK TEST
17 - 6.8 GALVANIZING TEST.
18 - SECTION 7. GROUP III TESTS-ROUTINE TESTS
18 - 7.1 GENERAL.
18 - 7.2 VISUAL EXAMINATION.
18 - 7.2.1 General.
18 - 7.2.2 Post Insulators or Post Insulator Units with Porcelain Insulating Parts
18 - 7.2.3 Post Insulators or Post Insulator Units with Glass Insulating Parts
18 - 7.3 THERMAL SHOCK TEST
18 - 7.4 MECHANICAL STRENGTH TEST.
18 - 7.5 POWER FREQUENCY TEST.
19 - APPENDIX A - SELECTION AND APPLICATION OF STATION POST INSULATORS
19 - A1 GENERAL.
19 - A2 SYSTEM INSULATION LEVEL.
19 - A3 ATMOSPHERIC POLLUTION.
19 - A4 CONDITIONS OF CLEARANCES.
19 - A5 ALTITUDE.
19 - A6 MECHANICAL STRENGTH.
20 - APPENDIX B - ITEMS TO BE SPECIFIED BY THE PURCHASER
21 - APPENDIX C - IEC REPORT ON RADIO-INTERFERENCE (INFLUENCE) TEST ON HV INSULATORS
21 - C1 INTRODUCTION.
21 - C2 GENERAL.
21 - C3 CLASSIFICATION OF TEST.
21 - C4 APPLICABILITY OF TEST.
21 - C5 ARRANGEMENT OF INSULATORS FOR TEST.
21 - C6 TEST PROCEDURE.

Covers materials, characteristics, fixing arrangements, and type, batch and routine tests, for insulators and insulator units designed to provide rigid support for busbars, parts of isolators, parts of air-break switches and other conductors in stations and for similar applications, but does not apply to insulators for supporting overhead transmission line conductors nor to bushing insulators. An appendix deals with selection and application of post insulators.

This standard specifies requirements for post insulators and post insulator units, in which the insulating material is of porcelain, toughened glass or annealed glass, for use indoors and outdoors, at nominal voltages greater than 1000 V and a frequency not greater than 100 Hz.It applies to insulators designed to provide rigid support for busbars, parts of isolators, parts of airbreak switches and other conductors in stations, and for similar applications.It does not apply to insulators for supporting overhead transmission line conductors, nor does it apply to bushing insulators.NOTE: Appendix B lists information which should be specified by the purchaser of the insulators.