Resultant Short Circuit Forces on Adjacent Surge Arrester and Voltage Transformer Terminals

[NSheikh]

Hi everyone!

Is there any software that can calculate cancel down effect of short circuit forces on adjacent terminals of a single node connections. That is, connections that are in continuity like in the case of CSE then SA, then from SA to CVT, and then from CVT to WB. If there is any research paper on it, do share. Or any software to find out the resultant short circuit force on every node.

Please find attached the image. In this image, a = 2x240 sq.mm Cu conductor

Static & Short Circuit forces coming by AIS cable software are:
In between CSE and SA = 310N (Static), 2.32kN (Dynamic)
In between SA and CVT = 235N (Static), 2.238kN (Dynamic)
In between CVT and Wall Bushing = 73N (Static), 2.063kN (Dynamic)

The problem is my SA terminal, SLL = 1.43kN, SSL = 2.05kN
and my CVT terminal, Static = 1kN and Dynamic=1.4kN

I cannot change the connections from double copper conductor to tube, neither I can connect CSE with Wall Bushing directly and give jumper to SA and CVT. My equipments are already ordered.

Can you please suggest any solution. I have used T-type connector on SA and CVT. And their terminals bearing forces loads are less than the short circuit forces coming.

 

[7anoter4]

IEC 60865-1 and 2 for hand calculation.
For programming, the equations are given in annex A
For less than 0.1 fault clearing time -considering aperiodic component- see CIGRE SC23,WG02,

https://orbi.uliege.be/handle/2268/115127

In any case -in my opinion- you have to reduce the short-circuit current

 

[NSheikh]

Can forces cancel out at each terminal of parallel connection, like in the case of Surge Arrester
and CVT?

 

[cuky2000]

No, the force does not cancel out. In contrast with the rigid bus design, the installation with flexible conductors should be less of a concern from the electrodynamic forces point of view.
A loading combination with short circuit forces plus the wind forces and the seismic forces should be considered. Based on a similar experience, the vertical load (deadweight + snow + Seismic) appear to be the dominant factor for horizontally mounting equipment such as the surge arrester shown in your post.