CT-100/CT-150 Series User’s Manual
The self-threading screws can have a maximum length of 15 mm, diameter of
2.9 mm, and the types that can be used are hereafter listed:
•
UNI 8119
•
DIN 7504 - P
•
ISO 15482
2.3
Primary Current Path
A non-symmetrical layout of the primary current return path may degrade the
accuracy and the noise of the current transducer. A cross section of the transducer
plastic case illustrates what happens if the primary current is not equally distributed
over the perimeter of the current transducer head.
Figure 8:
Primary current path
; non-recommended layout (left)
and recommended layout (right)
(left) shows what happens if the primary current is routed over one side
of the DCCT head: the Magnetic flux density is higher in the area between the “U” path.
If the current path return is split in two or more paths over the DCCT Head, the
magnetic flux density is more homogenous over the perimeter and the resulting
measurement will be more accurate. If the split return path is not possible, it is
preferable to keep the retuning cable as far as possible from the DCCT Head.
2.4
Full-Scale Current
Rated full-scale primary current can be easily changed by carrying out multiple
turns on the primary conductor hole.
The full-scale current can then be scaled by a factor of
N
, with
N
= number of
turns of the primary conductor around the hole.
As an example, in the CT-100 a primary current full-scale of 50A and of 33.3A
respectively is obtained by connecting primary conductor as shown in
. Using
DCCT Head
Primary Current
Summary of Contents for Flucs CT -100
Page 28: ...DC User s Manual...
