Dr I.B. Peshkov
, Prof., President of Electrocable Association
The state and prospects of aluminium usage in cable industry
The global and Russian aluminium markets are analyzed. Information on the volumes of aluminium processing at the cable plants of the Electrocable Association is given. The basic technical and economic characteristics of aluminium and copper are compared. Future trends of wider aluminium application in the production of cable and wire are discussed.
Aluminium, advantages, drawbacks, price, aluminium rod, volume of output, production output, recycling volume, copper replacement, bimetal conductor.
Science and technology
Leppanen J., Product Manager, Maillefer Extrusion Oy
Extra high voltage cable production with Maillefer catenary and vertical vulcanizing lines
The paper discusses the basic technical features of the insulating process in the medium, high and super-high voltage cable production with the use of Maillefer catenary and vertical vulcanizing lines. The authors describe the Entry Heat Treatment system incorporated in the catenary vulcanizing lines, the Post Heater conception and the МРН system applied in the vertical vulcanizing lines. The described technological decisions enable to increase the efficiency of power cable production and the product quality.
Medium-voltage cable, high-voltage cable, extra high-voltage cable, cross-linked polyethylene, vertical continuous vulcanization line, catenary continuous vulcanization line, preliminary thermal treatment, post heading.
V.F. Grafov, seniour lecturer; Irkutsk State Technical University;
S.M. Dedlovsky, Technical Director; OAO «Irkutskkabel»;
I.E. Kuklin, serviceman; OAO «Irkutskkabel»;
Dr Phys.-Math. Sc., Prof.; Irkutsk State Technical University;
Contact: firstname.lastname@example.org V.A. Temerov,
Manager of Technical Department; OAO «Irkutskkabel»;
S.I. Fadyushin, Engineer; OAO «Irkutskkabel»;
E.V. Fedotov, Manufacturing Engineer; OAO «Irkutskkabel»
Improvement of sector-shaped conductor insulating technology. Assurance of uniform insulation thickness around the conductor periphery.
The paper deals with the important problem of present-day cable production: application of uniform thickness insulation around the periphery of sector-shaped current-carrying conductors.
The authors suggested and tested under operating conditions a new method for stabilizing the insulation thickness around the conductor periphery: redistribution of the plastic compound melt over the sector elements and optimization of the relative position of the technological tooling and the conductor sector.
Insulation, current-carrying conductor, sector form, insulation thickness, thickness uniformity, core, mandrel, matrix, extrusion head.
V.V. Red’ko, Cand. Tech. Sc., Manager of High-Voltage Equipment Department;
OOO «NII ERMIS»
About the possibility of cable insulation testing by dc high voltage
In Russia dynamic tests of cable dielectric strength are carried out with a.c. high voltage, while in the USA and European countries d.c. high voltage tests are much more cost-effective and safer than a.c. voltage testing.
It has been proved experimentally that d.c. voltage test results in a number of cases are as reliable as a.c. voltage test results. Suggestions with regard to the test voltage value are given.
Cable insulation, voltage test, alternating current, direct current, value, test voltage, advantages, reliability.
S.H. Cree, T. Geussens, J.B. Kjellqvist, Dow Europe GmbH, Horgen, Switzerland;
A. Mendelsohn, Y. Gau
, The Dow Chemical Company, New Jersey, USA
Material Developments for High Voltage Cables
The paper presents the latest developments of Dow Wire & Cable intended for the manufacturers of high voltage power cables. Super-clean insulation materials of cross-linked polyethylene, as well as improved semiconducting screen materials for high and super high voltage cables are among these innovations. The paper also deals with other polymers applied in high voltage cable production: cable sheathing materials based on thermoplastic semiconducting compositions and improved high density polyethylene
Insulation, high voltage cable, power cables, semiconducting screen, cross-linked polyethylene, material purity, semiconducting compound, sheath, high density polyethylene.
Dr V.N. Korshunov
, Prof. of the Moscow Technical Communication and Informatics University
Optical cable carrying capacity
The cost of communication via optical cable (OC) is in reverse relationship with the general data transmission rate, which is in its turn limited by the OC transmission capacity.
The OC transmission capacity is determined by the number of optical fibers, total width of the transmission spectrum and limit spectral efficiency (the value of 6 b/s presented in the paper may be used for the latter). Formulas for calculating the OC transmission capacity are given.
Optical cable, data transmission rate, transmission capacity, bandwidth capability efficiency, spectral efficiency, optical fiber, distortion of a signal