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Installation Guide: Capstone C1000S/C800S/C600S with C1000 Series Controller
480064 Rev C (December 2018) Page 75 of 122
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7.4.3.1. Example 1 – 480V Operation
Figure 29. Typical Transformer Installation with Impedance Percentages – 480 V
Microturbine #1 (C600S with 666 kVA):
𝑍 = 4.7%(
666 𝑘𝑉𝐴
900 𝑘𝑉𝐴
) + 3.8%(
666 𝑘𝑉𝐴 + 888 𝑘𝑉𝐴 + 1110 𝑘𝑉𝐴
4500 𝑘𝑉𝐴
) + 3.5%(
666 𝑘𝑉𝐴 + 888 𝑘𝑉𝐴 + 1110 𝑘𝑉𝐴
5000 𝑘𝑉𝐴
) + 0.5%
Z = 8.09%
Microturbine #2 (C800S with 888 kVA):
𝑍 = 4.5%(
888 𝑘𝑉𝐴
1200 𝑘𝑉𝐴
) + 3.8%(
666 𝑘𝑉𝐴 + 888 𝑘𝑉𝐴 + 1110 𝑘𝑉𝐴
4500 𝑘𝑉𝐴
) + 3.5%(
666 𝑘𝑉𝐴 + 888 𝑘𝑉𝐴 + 1110 𝑘𝑉𝐴
5000 𝑘𝑉𝐴
) + 0.5%
Z = 7.94%
Microturbine #3 (C1000S with 1110 kVA):
𝑍 = 4.2%(
1110 𝑘𝑉𝐴
1300 𝑘𝑉𝐴
) + 3.8%(
666 𝑘𝑉𝐴 + 888 𝑘𝑉𝐴 + 1110 𝑘𝑉𝐴
4500 𝑘𝑉𝐴
) + 3.5%(
666 𝑘𝑉𝐴 + 888 𝑘𝑉𝐴 + 1110 𝑘𝑉𝐴
5000 𝑘𝑉𝐴
) + 0.5%
Z = 8.20%
Since the calculated inductive impedances are less than the 10% maximum listed in the
C1000S/C800S/C600S Technical Reference (Table 1), the system design is acceptable.