Theoretical aspects of mechanical stresses in a paper-lapped cable insulation

Mechanical stresses in a paper-lapped insulation which arise from the bending of a cable around a drum immediately after the lapping process are considered theoretically, and an estimate is obtained for the stress arising from the contact of the insulation with the drum. A known relation between interfacial pressure and lapping tension is rewritten to give the tension explicitly in terms of a prescribed interfacial pressure distribution. Finally, a certain form of internal buckling which could be relevant to the problem is briefly discussed.