Table 5- 6 Geniv Transformer Sizing And Derating Factors1*,2; Figure 5-8 Typical Geniv 4160V, 200-260 A Transformer - Siemens 6SR41 series Product User Manual

Product Description
5.3 Cabinet Details
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
1. Transformer initial sizing is based upon 1000 VA per Hp (including motor service
2. If ambient temperature exceeds 45°C, then transformer size is increased by:
3. If altitude exceeds 3300 feet above sea level, then transformer size is increased by:
68
GenIV Transformer Sizing and Derating Factors1*,2*
factor):
kVA = Hp * Service Factor
1
kVA = kVA * [175/(220-AMB)]^0.5
2 1
kVA = kVA * [1+0.00003*(ALT-3300)]
3 2
Operating Instructions, Version AE 12/2009, A5E01454341C
Product User Manual