Showing papers on "VLF cable testing published in 1978"
TL;DR: In this paper, the authors describe the steps to be taken to optimize the design of oil-paper insulated power cable for high voltage dc operation, and the experimental data is presented on models to establish the steady-state dc dielectric strength.
Abstract: This paper describes the steps to be taken to optimize the design of oil-paper insulated power cable for high voltage dc operation. Experimental data is presented on models to establish the steady-state dc dielectric strength and the switching surge polarity reversal dielectric strength of oil-paper insulations. Laboratory data is presented on factory made prototype cables tested under voltage stress conditions applicable to a ±600 kV dc system. Optimized designs of high-pressure oil-filled pipe-type and medium-pressure oil-filled self-contained cables are presented.
12 citations
TL;DR: In this paper, the effect of cyclical cable movement on the paper-oil dielectric of Cable A, with conductor temperatures reaching as high as 130°C, has been investigated and no evidence of significant displacement or damage to the paper tapes which would affect the service life of the cable.
Abstract: There is growing evidence that some service outages, in or immediately adjacent to the splice sleeves of heavily loaded EHV pipe-type cable lines, were associated with thermo-mechanical bending. This evidence, plus an additional instance of trouble induced by a mechanical mechanism in the EPRI-Manufacturers 550-kV Waltz Mill test program1, prompted a follow-up study. This paper reports on a project designed to assess the effect of cyclical cable movement on the paper-oil dielectric of Cable A, with conductor temperatures reaching as high as 130°C. A detailed examination of the cable after the loading schedule had been completed, revealed no evidence of significant displacement or damage to the paper tapes which would affect the service life of the cable. This work has been funded by the Electric Power Research Institute as a portion of their comprehensive program on underground transmission.
7 citations
TL;DR: In this paper, a self-contained oil-filled cable has been developed to meet increasing power requirements both in terms of voltage and ampacity, and power transmission capability for 230, 345 and 525 kV cable systems for a variety of natural and forced cooled conditions.
Abstract: The self-contained oil-filled cable has been developed to meet increasing power requirements both in terms of voltage and ampacity. The paper gives details of power transmission capability for 230, 345 and 525 kV cable systems for a variety of natural and forced cooled conditions. The highest rating is obtained with internal oil cooling and at 525kV 4000 MVA can be transmitted using one cable per phase. Details are given of accessory design features that have been adopted to ensure that these components do not become a limitation to power transmission capability.
7 citations
TL;DR: In this paper, the broadband response of a VLF/LF dual-wire aircraft antenna is analyzed via a superposition procedure in which the original problem is split into two transmission-line (differentialmode current) problems and two antenna (common-mode current).
Abstract: The broad-band response of a VLF/LF dual-wire aircraft antenna is analyzed. The impedance properties and the induced currents on the two wires of different lengths are obtained via a superposition procedure in which the original problem is split into two transmission-line (differential-mode current) problems and two antenna (common-mode current) problems. Results for the input admittance and short-circuit current of a representative VLF/LF dual-wire antenna are presented.
6 citations