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ABB PQFS User Manual

ABB PQFS
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Manual Power Quality Filter PQFS Electrical design and installation 49
Maximum rms current of the
downstream loads (including starting
current of DC drives):
X1 = ….. Arms
Multiply X1 by
1.6:
X2 = …. Arms
CT cables > 30 meters ?
Select 3 identical CT’s such that:
- rating at primary X2
- rating at secondary: 5A
- Burden 15 VA
- Class 1 accuracy or better
NO
Section of CT cables:
2.5 mm²? (recommended)
Determine the length of
CT cables (meters)
L = … m
X3 = (L x 0.007 x 25) + 10
X3 = … VA
Select 3 identical CT’s such that:
- rating at primary X2
- rating at secondary: 5A
- Burden X3 VA
- Class 1 accuracy or better
Determine the length (m) and
resistance (/m)of
CT cables (meters)
L = … m
R = … /m
X4 = (L x R x 25) + 10
X4 = … VA
Select 3 identical CT’s such that:
- rating at primary X2
- rating at secondary: 5A
- Burden X4 VA
- Class 1 accuracy or better
NOYES
YES
Figure 32: Flow chart for CT determination

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ABB PQFS Specifications

General IconGeneral
BrandABB
ModelPQFS
CategoryIndustrial Electrical
LanguageEnglish

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