Rockwell Automation 7703E Medium Voltage SMC OEM Components - 10-15 kV - Manual (Page 47)

Rockwell Automation Publication 7703E-IN001E-EN-P - July 2014 47
Appendix
A
Component Deratings
Deratings Specifications The components described in this publication may be applied in a wide variety of
situations. Some applications may require component derating. For example, at
altitudes above 1000 m (3300 ft), the maximum current and basic impulse level
(BIL) are reduced as shown in
Table 10 .
Table 10 - Component Derating Table
Altitude Rating
Reduce Max. Continuous Current Rating by: B.I.L. Withstand Rating
160 A c 340 A 580 A 12 kV 15 kV
0…1000 m
(0…3300 ft) — — 75 kv 95 kV
1001…2000 m
(3301…6600 ft) 5 A 10 A 15 A 66 kV 84 kV
2001…3000 m
(6601…9900 ft) 10 A 20 A 30 A 59 kV 74 kV
3001…4000 m
(9901…13,200 ft) 15 A 30 A 45 A 52 kV 66 kV
4001…5000 m
(13,201…16,500 ft) 20 A 40 A 60 A 46 kV 58 kV