BS EN IEC 60099-8:2018 – TC:2020 Edition
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Tracked Changes. Surge arresters – Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 163 |
NEW!IEC 60099-8:2017 is available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60099-8:2017 covers metal-oxide surge arresters with external series gap (externally gapped line arresters (EGLA)) that are applied on overhead transmission and distribution lines, only to protect insulator assemblies from lightning-caused flashovers. This document defines surge arresters to protect the insulator assembly from lightning-caused over-voltages only. Therefore, and since metal-oxide resistors are not permanently connected to the line, the following items are not considered for this document: – switching impulse spark-over voltage; – residual voltage at steep current and switching current impulse; – thermal stability; – long-duration current impulse withstand duty; – power-frequency voltage versus time characteristics of an arrester; – disconnector test; – aging duties by power-frequency voltage. Considering the particular design concept and the special application on overhead transmission and distribution lines, some unique requirements and tests are introduced, such as the verification test for coordination between insulator withstand and EGLA protective level, the follow current interrupting test, mechanical load tests, etc. Designs with the EGLA’s external series gap installed in parallel to an insulator are not covered by this document. This second edition cancels and replaces the first edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: The Lightning discharge capability test has been completely re-written and re-named to Test to verify the repetitive charge transfer rating, Qrs with lightning discharges to reflect changes introduced in IEC 60099-4 Ed.3 (2014) regarding new methods for rating the energy and charge handling capability of metal-oxide arresters. In addition to testing to evaluate the performance of the MO resistors, procedures for evaluating the performance of the EGLA series gaps have been introduced. – Omissions from Ed. 1 of this standard have been included, notably an RIV test and a means for determining the thermal time constant of the SUV portion of the EGLA. – Definitions for new terms have been added – A number of NOTES in Ed. 1 have been converted to normative requirements Keywords: externally gapped line arresters (EGLA), lightning-caused over-voltages
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 91 | National foreword |
| 95 | CONTENTS |
| 99 | FOREWORD |
| 101 | INTRODUCTION Figures Figure 1 – Configuration of an EGLA with insulator and arcing horn |
| 102 | 1 Scope 2 Normative references |
| 103 | 3 Terms and definitions |
| 106 | 4 Identification and classification 4.1 EGLA identification 4.2 EGLA classification Tables Table 1 – EGLA classification – “Series X” and “Series Y“ |
| 107 | 5 Standard ratings and service conditions 5.1 Standard rated voltages 5.2 Standard rated frequencies 5.3 Standard nominal discharge currents 5.4 Service conditions 5.4.1 Normal service conditions 5.4.2 Special service conditions Table 2 – Steps of rated voltages (r.m.s. values) |
| 108 | 6 Requirements 6.1 Insulation withstand of the SVU and the complete EGLA 6.1.1 Insulation withstand of the housing of the SVU 6.1.2 Insulation withstand of EGLA with shorted (failed) SVU 6.2 Residual voltages 6.3 High current duty 6.4 Lightning discharge capability 6.5 Short-circuit performance of the SVU |
| 109 | 6.6 Mechanical performance 6.7 Weather aging of SVU 6.8 Reference voltage of the SVU 6.9 Internal partial discharges 6.10 Coordination between insulator withstand and EGLA protective level |
| 110 | 6.11 Follow current interrupting 6.12 Electromagnetic compatibility 6.13 End of life 7 General testing procedure 7.1 Measuring equipment and uncertainty 7.2 Test samples |
| 111 | 8 Type tests 8.1 General 8.2 Insulation withstand tests on the SVU housing and on the EGLA with failed SVU 8.2.1 General Table 3 – Type tests (all tests to be performed with or without insulator assembly; by manufacturer’s decision) |
| 112 | 8.2.2 Insulation withstand test on the SVU housing 8.2.3 Insulation withstand tests on EGLA with failed SVU |
| 113 | 8.3 Residual voltage tests 8.3.1 General 8.3.2 Procedure for correction and calculation of inductive voltages |
| 114 | 8.3.3 Lightning current impulse residual voltage test |
| 115 | 8.3.4 High current impulse residual voltage test 8.4 Standard lightning impulse sparkover test |
| 116 | 8.5 High current impulse withstand test 8.5.1 Selection of test samples 8.5.2 Test procedure |
| 117 | 8.5.3 Test evaluation 8.6 Test to verify the repetitive charge transfer rating, Qrs with lightning discharges 8.6.1 MO resistors |
| 118 | Figure 2 – Test procedure to verify the repetitive charge transfer rating, Qrs |
| 119 | 8.6.2 Series gap |
| 120 | 8.7 Short-circuit tests 8.7.1 General Figure 3 – Test procedure to verify the repetitive charge withstand of the series gap |
| 121 | 8.7.2 Preparation of the test samples |
| 122 | 8.7.3 Mounting of the test sample |
| 123 | 8.7.4 High-current short-circuit tests |
| 125 | 8.7.5 Low-current short-circuit test 8.7.6 Evaluation of test results |
| 127 | Table 4 – Test requirements |
| 128 | Table 5 – Required currents for short-circuit tests |
| 129 | Figure 4 – Examples of SVU units |
| 130 | Figure 5 – Short-circuit test setup |
| 131 | 8.8 Follow current interrupting test 8.8.1 General 8.8.2 "Test method A" Figure 6 – Example of a test circuit for re-applying pre-failing circuit immediately before applying the short-circuit test current |
| 133 | 8.8.3 "Test method B" |
| 135 | 8.9 Mechanical load tests on the SVU 8.9.1 General 8.9.2 Bending test |
| 139 | Figure 7 – Thermo-mechanical test |
| 140 | Figure 8 – Example of the test arrangement for the thermo-mechanical test and direction of the cantilever load |
| 141 | Figure 9 – Test sequence of the water immersion test |
| 144 | 8.9.3 Vibration test |
| 145 | 8.10 Weather aging tests 8.10.1 General 8.10.2 Sample preparation 8.10.3 Test procedure 8.10.4 Test evaluation |
| 146 | 8.10.5 Additional test procedure for polymer (composite and cast resin) housed SVUs 8.11 Radio interference voltage (RIV) test 9 Routine tests 9.1 General |
| 147 | 10 Acceptance tests 10.1 General 10.2 Reference voltage measurement of SVU Table 6 – Acceptance tests |
| 148 | 10.3 Internal partial discharge test of SVU 10.4 Radio interference voltage (RIV) test 10.5 Test for coordination between insulator withstand and EGLA protective level 10.5.1 General 10.5.2 Steep front impulse test Table 7 – Virtual steepness of wave front of steep front impulses |
| 149 | 10.5.3 Standard lightning impulse sparkover test 10.6 Follow current interrupting test 10.6.1 General |
| 150 | 10.6.2 Test procedure 10.6.3 Test sequence 10.6.4 Test evaluation 10.7 Vibration test on the SVU with attached electrode 10.7.1 General 10.7.2 Sample preparation 10.7.3 Test procedure and test condition |
| 151 | 10.7.4 Test evaluation |
| 152 | Annex A (informative) Example of a test circuit for the follow current interrupting test Figure A.1 – Example of a test circuit for the follow current interrupting test |
| 153 | Annex B (normative) Mechanical considerations B.1 Test of bending moment Figure B.1 – Bending moment – Multi-unit SVU |
| 154 | B.2 Definition of mechanical loads Figure B.2 – Definition of mechanical loads |
| 155 | B.3 Definition of seal leak rate Figure B.3 – SVU unit |
| 156 | B.4 Calculation of wind-bending-moment Figure B.4 – SVU dimensions |
| 157 | B.5 Flow chart – Procedures of tests of bending moment for porcelain/cast resin and polymer-housed SVUs Figure B.5 – Procedures of tests of bending moment for porcelain/cast resin and polymer-housed SVUs |
| 158 | Annex C (normative) Special service conditions C.1 General C.2 Temperature in excess of +40 °C or below –40 °C C.3 Application at altitudes higher than 1 000 m C.4 Fumes or vapours that may cause deterioration of insulating surface or mounting hardware C.5 Excessive contamination by smoke, dirt, salt spray or other conducting materials C.6 Excessive exposure to moisture, humidity, dripping water, or steam C.7 Live washing of arrester C.8 Unusual transportation or storage |
| 159 | C.9 Non-vertical erection and suspended erection C.10 Wind speed > 34 m/s C.11 Earthquake C.12 Torsional loading of the arrester |
| 160 | Bibliography |
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