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.