Category Archive for: «Cables»

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Test On 110kV Power Cable After Installation (3)

General description of site test procedure In previous two parts of this technical article first six procedures were explained. Now the last three (7, 8 and 9) will be explained in details: Phase indication test (part 1) DC conductor resistance measurement (part 1) Capacitance test (par 1) DC Sheath test on outher sheath (part 2) Insulation resistance […]

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Test On 110kV Power Cable After Installation (2)

General description of site test procedure In previous part of this technical article first three procedures were explained. Now the rest will be explained in details: Phase indication test (previous part) DC conductor resistance measurement (previous part) Capacitance test (previous part) DC Sheath test on outher sheath Insulation resistance measurement Cross bonding check Zero sequence and […]

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Test On 110kV Power Cable After Installation (1)

General description of site test procedure Site test procedure covers all necessary electrical testing for the 110 kV cable and accessories to be carried out during and after installation of the cable system. 110 kV, 115 kV and 132 kV XLPE Cables (Standard Reference is IEC 60840 and relevant SEC Transmission Specifications 11-TMSS-02, Rev. 0 […]

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Characteristics of XLPE insulated cables with reference to the UK standards

Cross-linking effect XLPE is the recognized abbreviation for cross-linked polyethylene. This and other cross-linked synthetic materials, of which EPR (ethylene propylene rubber) is a notable example, are being increasingly used as cable insulants for a wide range of voltages. Polyethylene has good electrical properties and in particular a low dielectric loss factor, which gives it […]

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4 ways in which noise can enter a signal cable and its control – Part 2

Continued from part 1… Read here. Electromagnetic induction and RFI In previous part of this technical article, I wrote about electrical noise occurs or is transmitted into a signal cable system in the following four ways: Galvanic (direct electrical contact) – part 1 Electrostatic coupling – part 1 Electromagnetic induction Radio frequency interference (RFI) 3. […]

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4 ways in which noise can enter a signal cable and its control – Part 1

Few words about interference… Noise, or interference, can be defined as undesirable electrical signals, which distort or interfere with an original (or desired) signal. Noise could be transient (temporary) or constant. Unpredictable transient noise is caused, for example, by lightning. Electrical noise occurs or is transmitted into a signal cable system in the following four […]

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What engineers should know about using conduits in power substation designs

Design challenges There are several locations where conduit is used in power substation designs. The most common one considered is conduit used to provide cable access to equipment, such as breakers, transformers, instrument transformers, and motor-operated disconnect switches located in the yard of the substation. Conduit can be a means by which direct buried cable […]

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Cable spacing as a means of noise mitigation

Separation distances In situations where there are a large number of cables varying in voltage and current levels, the IEEE 518-1982 standard has developed a useful set of tables indicating separation distances for the various classes of cables. There are four classification levels of susceptibility for cables. Susceptibility, in this context, is understood to be […]

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An example how to calculate voltage drop and size of electrical cable

Input information Electrical details: Electrical load of 80KW, distance between source and load is 200 meters, system voltage 415V three phase, power factor is 0.8, permissible voltage drop is  5%, demand factor is 1. Cable laying detail: Cable is directed buried in ground in trench at the depth of 1 meter. Ground temperature is approximate […]

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Underfloor Cable Systems

Power distribution It should be understood that the generic term ‘underfloor’ applies to products designed for such use but which may well be used in other environments where the protection is appropriate. There are two main types of such systems: Those designed for incorporation into the floor structure itself, such as trunking systems for casting […]

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