Electromagnetic forces and installation methods
for single core cables.
(-)Abstract
Preliminary tests have been performed on trefoil and
flat foraations. Durinq these tests the coaaercial
cleats and ties proved to be inadequate indicatinq
the need for relevant testinq methods for sue~
equipment. Tests on sinqle phase runs SO and 240 aa
Al, 12 kV cables qave good coherence between electro•
agnetic forces and movements of cables.
Short-circuit tests on trefoil configurations with
total fault time of 1 sec. require very small tie
spacing to withstand the thermomechanical and
electromechanical forces. Test on single core cables
laid in trefoil with a peak value of 110 kA and
r.m.s. current of 56 kA for half a second indicated
that a tie spacinq of maximum 0.3 m is required.
Further tests are planned to provide background for
national guidelines for cable installations.
