Mechanical Force in High Voltage Surge Arrester

There is minimal to no mechanical force imposed on the ground lead. The discharge current is an impulse; defined in the laboratory and in surge arrester standards as an 8-10/10-20 microsecond impulse current. It's essentially the result of a 1.2/50 impulse voltage applied between the arrester line and ground terminals.

It's not the same as a power frequency fault current which can result in significant mechanical force.

i am familiar with forces between conductors, contacts, etc, due to high currents. A good paper on this is ect162.pdf

However, only one conductor to earth ? i don't know how it can be subject to any mechanical force....

One guy is posting shnieder documents in every OP.......