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Line Trap Positioning 2

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luiscunha1978

luiscunha1978

Mechanical
Feb 8, 2019
21
Hi everyone!

I need help to understand how the below line trap (LT) positioning/mounting will allow the correct functionality of the PLC system. As you can see this is a suspended mounted LT and bellow we have a CCVT:

LT_fzxmi0.png



From my understanding, since the LT blocks the carrier frequency by present a high impedance and a low impendance at the power frequency, the CCVT/Coupling Capacitor should be placed downstream from the LT.

So, I cannot undestand how the depicted picture could allow the correct functionality of the system. Perhaps this is a silly question but I need help to understand this suspension mounted assembly.

Thank you in advanced
 
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As far as I understand the system, the coupling connection needs to be on the line side of the trap. What is the unlabeled device that is connected to the line side? If the device labeled as the CCVT is only for voltage sensing and the other device is the signal coupling device all is well. If the other device is an arrestor, it is also not properly connected as it has far too long a lead.
 
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That won't work if the connections are as they appear in the drawing.

The CVT has to be on the line side of the line trap. That drawing shows the CVT connected on the station side of the line trap, which is wrong.

CVTs don't need to be protected by arresters, so the correct arrangement would be to switch the CVT and arrester position in the drawing.

 
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Thank you davidbeach and scottf for your support. That is clear now!

That drawing was issued by my client and the unlabeled device is in fact a Surge Arrester. The CCVT is coupling capacitor voltage transformer.
 
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