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The zinc oxide-based varistors is a polycrystalline ceramic with a highly non-linear current- voltage characteristic. The conventional chemical composition of this material contains several metallic oxides such as the Bi/sub 2/O/sub 3/, Sb/sub 2/O/sub 3/, Mn/sub 2/O/sub 3/, Cr/sub 2/O/sub 3/...etc. With these oxides commercialised varistors with a threshold(More)
The present article describes an experimental apparatus for the measurement of low-loss dielectric material under conditions of high pressures (maximum pressure 1500 bars) and high frequencies (1-15 MHz.) The measurements of these losses are based on the classical method of the Q-meter with a general Radio type 1690-A sample holder, located in a(More)
The dielectric loss measurements of submarine telecommunication cables can be determined under use conditions with our experimental apparatus. The principle of measurement is based on the air substitution technique, using a Hewlett Packard 4342 Q meter and a General Radio 1690 A dielectric sample holder. The later is located within a hydrostatic pressure(More)
Low density Polyethylene (LDPE) plays an important part in high voltage cable insulation, particularly in submarine d.c power transmission lines. In this particular case, it is worth observing the behaviour of this material under conditions similar to its real application. Conductivity measurements of LDPE as a function of hydrostatic pressure helps us(More)
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