IEC IEC60099-6 Edition 2.02019-05 INTERNATIONAL STANDARD NORME INTERNATIONALE INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.240.10 ISBN 978-2-8322-6919-0 Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agree. ? Registered trademark of the International Electrotechnical Commissior - 2 - IEC60099-6:2019IEC2019 FOREWORD. INTRODUCTION.. 9 Scope. 1 10 2 Normative references 10 3 Terms and definitions . 11 4 Identification and classification 4.1 Arrester identification..... .18 4.2 Arrester classification .. .18 5 Standard ratings and service conditions 19 5.1 Standard rated voltages. 19 5.2 Standard rated frequencies.. 19 5.3 Standard nominal discharge currents . 19 5.4 Service conditions........ 5.4.1 Normal service conditions... 5.4.2 Special environmental conditions.. 6 Requirements .. .20 6.1 Insulationwithstand.. 6.2 Residual voltages .. .20 6.3 Impulse protective levels.. .20 6.4 Internal partial discharges... .20 6.5 Seal leak rate 21 6.6 Thermal stability.. 21 6.7 Heat dissipation behaviour of test sample 6.8 Repetitive charge transfer withstand ... 6.9 Operating duty ....... ..21 6.10 Power-frequency voltage versus time characteristics of an arrester ..21 Short-circuit performance... .22 6.11 Disconnectors .. 6.12 .22 6.12.1 Disconnector withstand... .22 6.12.2 Disconnector operation. 6.13 Requirements on internal grading components. Power-frequency sparkover .22 6.14 .22 6.15 Mechanical loads, 6.15.1 General 6.15.2 Bending moment... 22 6.15.3 Resistance against environmental stresses .23 6.15.4 Insulating base and mounting bracket. 6.15.5 Mean value of breaking load (MBL) 6.16 Electromagnetic compatibility.. End of life .... 6.17 ..23 7 General testing procedures.. .23 7.1 Measuring equipment and accuracy. 7.2 Test samples . .23 7.2.1 General. .23 7.2.2 Samples for residual voltage tests ... 7.2.3 Samples for the test to verify the repetitive charge transfer rating, Ors ...24