Capstone Microturbine C1000 Series - Figure 30. Typical Transformer Installation with Impedance Percentages - 400 V

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Installation Guide: Capstone C1000S/C800S/C600S with C1000 Series Controller
480064 Rev C (December 2018) Page 76 of 122
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7.4.3.2. Example 2 – 400V Operation
Figure 30. Typical Transformer Installation with Impedance Percentages – 400 V
Microturbine #1 (C600S with 624 kVA):
𝑍 = 4.7%(
624 𝑘𝑉𝐴
900 𝑘𝑉𝐴
) + 3.8%(
624 𝑘𝑉𝐴 + 832 𝑘𝑉𝐴 + 1040 𝑘𝑉𝐴
4500 𝑘𝑉𝐴
) + 3.5%(
624 𝑘𝑉𝐴 + 832 𝑘𝑉𝐴 + 1040 𝑘𝑉𝐴
5000 𝑘𝑉𝐴
) + 0.5%
Z = 7.61%
Microturbine #2 (C800S with 843 kVA):
𝑍 = 4.5%(
843 𝑘𝑉𝐴
1000 𝑘𝑉𝐴
) + 3.8%(
624 𝑘𝑉𝐴 + 832 𝑘𝑉𝐴 + 1040 𝑘𝑉𝐴
4500 𝑘𝑉𝐴
) + 3.5%(
624 𝑘𝑉𝐴 + 832 𝑘𝑉𝐴 + 1040 𝑘𝑉𝐴
5000 𝑘𝑉𝐴
) + 0.5%
Z = 8.11%
Microturbine #3 (C1000S with 1040 kVA):
𝑍 = 4.2%(
1040 𝑘𝑉𝐴
1300 𝑘𝑉𝐴
) + 3.8%(
624 𝑘𝑉𝐴 + 832 𝑘𝑉𝐴 + 1040 𝑘𝑉𝐴
4500 𝑘𝑉𝐴
) + 3.5%(
624 𝑘𝑉𝐴 + 832 𝑘𝑉𝐴 + 1040 𝑘𝑉𝐴
5000 𝑘𝑉𝐴
) + 0.5%
Z = 7.04%
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.
TX1
TX2
TX3
TX4
TX5