Siemens 6SR41 series - Figure 5-8 Typical Geniv 4160 V, 200-260 a Transformer; Table 5- 6 Geniv Transformer Sizing and Derating Factors1*,2

Product Description
5.3 Cabinet Details
Product User Manual
68 Operating Instructions, Version AE 12/2009, A5E01454341C
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Figure 5-8 Typical GenIV 4160V, 200-260 A Transformer
The transformers are sized on a 1000 VA per Hp basis (as shown in Chapter 1, and further
shown below); however, other factors must be considered, such as motor lead length, motor
service factor, environment ambient and altitude, and power cell redundancy (N+1 3300 V
project). These factors may increase the kVA size of the Perfect Harmony transformer as
follows:
Table 5- 6 GenIV Transformer Sizing and Derating Factors1*,2*
1. Transformer initial sizing is based upon 1000 VA per Hp (including motor service
factor):
kVA
1
= Hp * Service Factor
2. If ambient temperature exceeds 45°C, then transformer size is increased by:
kVA
2
= kVA
1
* [175/(220-AMB)]^0.5
3. If altitude exceeds 3300 feet above sea level, then transformer size is increased by:
kVA
3
= kVA
2
* [1+0.00003*(ALT-3300)]