ABB APC Series, Инструкции по установке, эксплуатации и обслуживанию

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APC - Chapter 3. Installation 15
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APCL1 APCL2
Figure 3.4. P
ower cables connection to the incoming power terminals for boxes
3.4.3.2. APCM1, APCM2 and APCR cubicles
The APCM and APCR cubicles are available in bottom or top cable entry. By default, the bottom cable entry
is applied.
The plate at the bottom left of the cubicle is provided to allow cable entry (see Figure 3.1.) In case of top
cable entry, use the two other plates at the top of the cubicle.
Run the power cable through a gland of a suitable diameter in order to keep the protection level of the
cubicle.
APCM1 APCM2 APCR
(bottom cable entry on the picture) (bottom cable entry on the picture) (top or bottom cable entry)
Figure 3.5. Power cables connection to the incoming power terminals for cubicles
3.4.4. Current transformer connection
Current transformers of Class 1 accuracy and appropriate burden with secondary current 5A will normally be
used. In case CT and the automatic capacitors are close to each other a 5VA burden is sufficient if no other
loads are connected to the CT.
The current transformer must be sited in a position to monitor the total load (i.e. inductive load and
capacitive load). This will normally be close to the incoming supply metering position. A range of ring and
split core CTs exists on the market to ease installation.
Current transformers are normally marked P1/P2 and S1/S2 and should be positioned so that P1 faces
the incoming supply while P2 faces the load side.
Control wires from S1 terminal go to terminal marked
k
on the circuit diagram and from S2 to
terminal marked
l
on the diagram. Once the connection is made, the shorting link (gray jumper)
must be removed for proper operation.
To easy guide control wires, a cable profile is fixed in each box.
Each cubicle has several base supports on its central frame to receive cable ties.