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The basic technical parameters are complied with the technical specification of IEEE and IEC60099-4
S/N | TECHNICAL DETAILS | UNITS | DATA | |
1. | Type | 33kV gapless type metal oxide surge arrester – Distribution class |
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2. | Nominal system voltage | kV | 33 | |
3. | Highest system voltage | kV | 36 | |
4. | Power frequency | Hz | 50 | |
5. | Basic Insulation Level (BIL) | kV | 170 | |
3. Ratings and type of surge arrester |
||||
6. | Specification to which surge arrester complies | IEC 60099 | ||
7. | Rated voltage of surge arrester | kV | 29 | |
8. | Nominal, 8/20 µs, discharge current rating of surge arrester | kA | 10 | |
9. | Maximum continuous operating voltage of surge arrester | kV | 22 | |
10. | Gapless or gapped type metal–oxide surge arrester | Gapless | ||
11. | Insulation Material | Silicon rubber | ||
12. | Cantilever strength of surge arrester | Nm | 300 | |
13. | Rated frequency of surge arrester | Hz | 50 | |
14. | Design altitude of surge arrester (above sea level) | m | 1 400m | |
15. | Design ambient temperature of surge arrester | oC | –1 to 40 | |
16. | Minimum phase–to–ground specific creepage distance of surge arrester |
.mm/kV | 25 | |
Automatic earth lead disconnectors requirements | ||||
17. | Automatic earth lead disconnectors fitted | Yes/No | Yes | |
18. | Corrosion protection of metal and alloy parts: galvanising | To SABS 763, 316 |
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