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Thermo-mechanical bending (TMB) of pipe cables has become a topic of interest since the appearance of numerous failures in the only extensive utility installation of 345 kV cable. Those failures occur in the unsupported span of cable within the joint casing; the question naturally arises whether TMB distress will occur within the line pipe if within-joint failures are prevented (by rigidizing the...
Last year at this conference we discussed various methods for measuring the gassing properties of cable oils under electrical stress and described a modification of the Pirelli test designed for rapid and convenient operation1. In using this apparatus on various natural and synthetic hydrocarbon oils, we have found a great diversity in gassing behavior, especially with changes in temperature. While...
Although the gassing of electrical oils under stress has been studied for many years and discussed by a number of authors (1–4, 6–8, 10,11), there appears to be no general agreement as to test methods nor even as to the influence of some of the major test variables. Recent work of Basseches and co-workers indicates that various free-radical reagents will greatly reduce the gassing of paraffinic oils...
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