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3.5.3.
Accuracy
The CTs are able to measure with enough accuracy from 0.9xIsmin:
Taped CT
Epoxy CT
Is setting
CT008-5
CT008-5
8-28 A
CT016-5
CT016-5
CT016-10
16-56 A
CT032-5
32-112 A
CT064-5
64-224 A
CT128-5
128-448 A
CT256-5
256-896 A
I<Is
→
Accuracy >5%
0.9xIsmin< I < 1.2xIsmin: <12.5%
I>1.2xIsmin: <5%
3.5.4.
How to select the correct CT
To select the CT correctly it is necessary to consider different parameters:
1.
Power CT primary nominal current:
It will be selected the CT with a range where this
nominal current (
In
) is included:
CT type
In (Primary nominal current)
CT008-5
3-33 (A)
CT016-5
CT016-10
6-65 (A)
CT032-5
12-130 (A)
CT064-5
25-260 (A)
CT128-5
51-520 (A)
CT256-5
102-1040 (A)
Summary of Contents for SIA-B
Page 9: ...www fanox com Rev 32 9 114 The dimensions are in mm Cut out pattern ...
Page 11: ...www fanox com Rev 32 11 114 Cut out pattern 2 3 Striker dimensions 2 3 1 PRT 15 ...
Page 12: ...www fanox com Rev 32 12 114 2 3 2 PRT A 44 5 B 49 5 C 56 5 D 64 5 E 42 5 ...
Page 19: ...www fanox com Rev 32 19 114 3 3 Functional Diagram ...
Page 24: ...www fanox com Rev 32 24 114 Dimensions ...
Page 27: ...www fanox com Rev 32 27 114 Dimensions Model CT16 5 Model CT08 5 ...
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Page 101: ...www fanox com Rev 32 101 114 Trip Voltage Level 17 Vdc C Nominal current 8 C CT type CT008 ...
Page 113: ...www fanox com Rev 32 113 114 NOTES ...
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