power cable


Also found in: Dictionary, Thesaurus, Wikipedia.

power cable

A metal wire that provides electricity to a unit of equipment. Contrast with "signal cable," which is used to transfer data. See molex connector.

Power Cable

 

an electric cable designed to transmit electric power from the place where it is produced or converted to industrial enterprises, stationary power and lighting installations, transportation installations, and public utilities. The term “power cable” in the generally accepted sense refers to cables designed to carry voltages up to 35 kilovolts (kV), usually with paper insulation impregnated with a viscous insulating compound. A cable with oil under pressure is used for higher voltages (seeOIL-FILLED CABLE).

The most extensively used power cables are designed to carry voltages up to 10 kV. They contain three aluminum or, less often, copper sector-shaped conductors, with a cross section up to 240 sq mm. The primary insulation on such power cables consists of paper tapes applied in a spiral around each conductor; the tapes are impregnated with a viscous insulating compound of 75 to 85 percent mineral oil and 15 to 25 percent rosin. The thickness of the insulation around each conductor depends on the nominal voltage of the cable and varies from 0.75 mm for 1 kV to 2.75 mm for 10 kV. The insulated conductors are twisted together and surrounded by an insulating paper covering approximately half the thickness of the insulation around each conductor. An airtight metal sheath made of lead or aluminum (the latter material is becoming predominant) is pressed onto the paper covering, followed by a protective jacket.

Power cables designed to carry voltages of 20 to 35 kV have round conductors with individual insulation up to 9 mm thick. Each conductor has an individual metal sheath or a covering made of metal foil.

In the operating temperature range of 50° to 80°C, the viscosity of the oil-rosin compound is lowered. As a result, on inclined portions of a power cable run the uppermost parts of the cable can become unserviceable because of the gradual flow of the liquid insulation. Therefore, the difference between the heights of the upper and lower points in a cable run is strictly limited to maximum permissible values of 5 to 25 m for cables carrying voltages of 35 to 1 kV, respectively.

One of the principal trends in improving power cables is the expansion of the output of cables having a nonflowing impregnating compound, which permit cable runs with steeply inclined and vertical segments. Another trend is the changeover from paper insulation to insulation made from polymers, such as polyvinyl chloride and polyethylene. The use of improved types of insulation results in significant savings in deficient paper, oils, and rosin and reduces labor expenditures and production time. The use of such insulation materials makes cables lighter and increases the permissible operating temperature. For example, a power cable with insulation made of cross-linked polyethylene maintains a high resistance to deformations even at temperatures up to 150°C over a limited time. This property is very important during short circuits.

REFERENCES

Privezentsev, V. A., and E. T. Larina. Silovye kabeli i vysokovol’tnye kabel’nye linii. Moscow, 1970.
Belorussov, N. I. Elektricheskie kabeli iprovoda. Moscow, 1971.
Barnes, C. Silovye kabeli. Moscow, 1971. (Translated from English.)

V. M. TRET’IAKOV

power cable

An assembly of one or more electric conductors with one or more of the following protective coverings: insulation, inner jacket, protective armor, and outer jacket.
References in periodicals archive ?
Shandong Yanggu has three power cables manufacturing plants, employing 1,200 staff in northern China, with CNY1.
Norwegian engineering, construction and technology group Aker Kvaerner ASA said on Wednesday (24 October) that it has received an order for subsea power cables and control umbilicals from Petrobras Americas Inc.
According to court records, a company specialising in power cables informed the Abu Dhabi Prosecution on Financial Crimes that one of its employees abused his position and stole cables from a power station.
The contract covers the delivery of power cables to the Rhyl Flats offshore wind farm in North Wales.
Use tie wraps, NSN 5975-00-074-2072, to secure the grounding wire to the power cable.
Norwegian pipelines, umbilicals and power cables contractor Oceanteam Power & Umbilical ASA (Oceanteam) said on Wednesday (14 March) that it has signed a long-term cooperation agreement with ABB Power Technologies AB, part of Swiss-Swedish power and automation group ABB (NYSE: ABB).
The US power cable market is the second largest in the world, and we believe it is poised for growth as the need for alternative energy and increased energy efficiency converges with an economic recovery," said Stephen Carter, CEO of Superior Essex Inc.
Although some countries such as Turkey still use multipolymer (PVC and PE) solutions in power cables, major parts of European distribution and transmission system operators have shown a clear preference for crosslinked low-density polyethylene-based materials (XLPE) for power cable insulation systems and polyethylene for jacketing.
The contract, valued at GBP10m, is part of the Angel Gas Project offshore Dampier on the Australian North West Shelf, and involves the installation of a 51-kilometre power cable linking the existing North Rankin A platform with the Angel Platform.
We are happy to support LS Cable's growth plans for the global superconductor power cable market.
NORDIC BUSINESS REPORT-8 December 2006-Oceanteam Power & Umbilical AS charters DP2 Power Cable Lay Vessel(C)1994-2006 M2 COMMUNICATIONS LTD http://www.
Companies Jointly Seeking More Than 50 Kilometers of Commercial Superconductor Power Cable Deployments Over the Next Five Years