EN 60099-9:2014

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Typical HVDC converter station schemes,
   arrester types, locations and operating voltage
5 Identification and classification
6 Service conditions
7 Requirements
8 General testing procedure
9 Type tests (design tests)
10 Routine tests and acceptance test
11 Test requirements on different types of arresters
Annex A (normative) - Test to verify thermal equivalency
        between complete arrester and arrester section
Annex B (normative) - Determination of the start
        temperature in the thermal recovery test
Annex C (normative) - Mechanical considerations
Annex D (informative) - Different circuit configurations
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

IEC 60099-9:2014 applies to non-linear metal-oxide resistor type surge arresters without spark gaps designed to limit overvoltages in HVDC converter stations of two terminal, multiterminal and back-to-back type up to and including an operating voltage of 1 100 kV. The standard applies in general to porcelain-housed and polymer-housed type arresters but also to gas-insulated metal enclosed arresters (GIS-arresters) solely used as d.c. bus and d.c. line/cable arresters. Arresters for voltage source converters are not covered. Arresters applied on the a.c. systems at the converter station and subjected to power-frequency voltage of 50 or 60 Hz principally without harmonics are tested as per IEC 60099-4. The arresters on a.c.-filters are tested according to this standard. Keywords: testing of gapless metal-oxide surge arrestors for HVDC converter stations