Experiences With IEC 62271-200  In Case Of Internal Arc Testing Of Medium Voltage Switchgear

Experiences With IEC 62271-200 In Case Of Internal Arc Testing Of Medium Voltage Switchgear PowerPoint PPT Presentation


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Experiences With IEC 62271-200 In Case Of Internal Arc Testing Of Medium Voltage Switchgear

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1. Experiences With IEC 62271-200 In Case Of Internal Arc Testing Of Medium Voltage Switchgear 19th International Conference on Electricity Distribution Vienna 21 - 24 May 2007

2. INTRODUCTION EXPERIENCES WITH IEC 62271-200 IN CASE OF INTERNAL ARC TESTING DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS ACCORDING TO IEC 62271-200 SUMMARY

3. History 1990: IEC 60298, edition 3.0 2000: Modification of IEC 60298, ed. 3.0, by SC17C, maintenance team 14 2002: Publication of committee draft for voting (CVD) 2002: Vote closing of final draft international standard (FDIS) 2003: Publication of IEC 62271-200, ed. 1.0 2006: Preparation of IEC 62271-200, ed. 2.0 Target IEC 62271-200, ed. 2.0 2007: ? Committee draft (CD) 2008: ? Committee draft for voting (CDV) 2009: ? Final draft international standard (FDIS) 2009: ? International Standard Publication in December Introduction

4. Introduction Main modification due to internal arc testing Main causes of an internal arc : Operation and maintenance faults Atmospheric and switching overvoltages Dielectric faults / insulation, esp. VT and cable terminations Overload of switches, circuit breakers and fuses Target Improvement of personal safety for operators and general public

5. INTRODUCTION EXPERIENCES WITH IEC 62271-200 IN CASE OF INTERNAL ARC TESTING DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS ACCORDING TO IEC62271-200 SUMMARY

6. Major Changes Introduction of Internal Arc Class (IAC) Clear setup definitions for internal arc type testing: Test arrangement / Room simulation: floor, ceiling and two walls perpendicular to each other Test object: minimum 2x panels Placement and arrangement of indicators Energy feeding direction Arc ignition conditions and position Exhaust ducts Insulating fluid: replacement of SF6 with air is permitted Not standardized: Assessment of stresses on surrounding walls EXPERIENCES WITH IEC 62271-200 IN CASE OF INTERNAL ARC TESTING

7. Practical Experiences Insulating fluid: Replacement of SF6 by air with respect to environment ? Increased pressure rise dP/dt ? Increased compartment overpressure ? Guarantee of maximum protection with respect to rupture and deformation of the tested compartment Test arrangement / Room simulation: Buildings or substations in utilities or industries are optimised to minimum dimensions with heights of less than 2500 mm The standardised distance of 600 mm between ceiling and upper part of the switchgear does not meet the technical requirements of the national and international market ? Modification of this specification may be reasonable Exhaust ducts: An additional remark on security of the personal protection near the output is missing ? Definition for hot gas emission conditions with respect to personal safety desirable EXPERIENCES WITH IEC 62271-200 IN CASE OF INTERNAL ARC TESTING

8. INTRODUCTION EXPERIENCES WITH IEC 62271-200 IN CASE OF INTERNAL ARC TESTING DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS ACCORDING TO IEC62271-200 SUMMARY

9. Studies on internal arc tests A new developed gas-insulated switchgear generation for primary distribution Rated voltage up to 40.5 kV Rated current up to 2500 A STC and breaking/making current up to 40 kA Single and double busbar Internal arc testing according to IEC 62271-200 Class IAC AFL / AFLR Internal arc 104 kApeak / 40 kArms 1 s DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS

10. Internal arc test: Simulation in container Two functional units Pressure relief channel and exhaust duct Class IAC AFLR Ignition in cable compartment Two phase 87 % of 40 kArms DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS

11. 3-D CFD Internal Arc Modelling Arc representation as volume heat source Electric power fit function (prev. tests) Effective volume of wall stabilized arc Gas enthalpy with cp(T) (plasma properties) Shear-Stress-Transport turbulence model Full 3-D geometry representation DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS

12. IAC AFLR 40 kA / 1s test in container DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS

13. Comparison of test and simulation results DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS

14. INTRODUCTION EXPERIENCES WITH IEC 62271-200 IN CASE OF INTERNAL ARC TESTING DEVELOPMENT OF A NEW GIS GENERATION IN THE CONTEXT OF INTERNAL ARC TYPE TESTS ACCORDING TO IEC62271-200 SUMMARY

15. Summary Arc-proof MV switchgear with Internal Arc Classification guarantee Highest personal safety Standardised definition of test arrangement / room simulation and distances do not meet all technical requirements of the national and international market Calculations can simulate the effects of internal faults and support switchgear development

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