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The field achieved in these screened cables is radial and generally a weakly nonuniform field. For making cable joints and terminations, the screen is extended in the form of a cone, known as “stress cone”. 10 Photographs of stress control arrangements in HV dc test equipment, courtesy Highvolt, Dresden, Germany (a) Dome and toroid shaped electrodes (b) Large shaped bodies with segmented electrodes. 11. It is a common practice to use bundles of two or more conductors at the same potential instead of a single conductor in transmission lines and bus bars above 220 kV.

11]. Electrodes at high potentials in the laboratory are given large, smooth, domelike bodies or other shapes, like toroid rings, to bring down the electric stress on the atmospheric air (dielectric). The modern trend in such electrode design includes “segmented electrodes”. These constitute a number of small, identical, smooth discs brought together to give rise to a large desired continuous shape as per requirement. The curvatures of the individual segment discs are worked out by optimization of the suggested profiles.

17. The fundamental condition of the field remains unchanged on either side of the interface. This leads to an undisturbed distribution of potential as well as field intensity in the two dielectrics. Let us consider the breakdown/flashover in such a multi-dielectric system of two dielectrics. Ideally the breakdown should always occur in the dielectric having lower breakdown strength. For an undisturbed field distribution, the breakdown voltage should be measured the same as for the weaker single dielectric system.

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