Category Archive for: «Cables»

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Electrical Design Project Of a Small Bakery (1)

Electrical System of Bakery A small bakery with just a counter and storage areas is simple to design. The electrical design follows the layout for a house, but care must be taken on loading factors if direct-acting electric heaters are switched on all day. These days, many shops and stores have specialised equipment for cooking food or providing other […]

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Few Aspects of Copper versus Aluminium

Conductor connections and terminations The constructions of aluminum wire and terminals have both been revised from past years. At one time the conductor was nearly pure aluminum, now they are all much stronger 8000 series alloys, with physical characteristics similar to copper. The wire terminations also have much more severe UL test requirements, resulting in […]

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General Guidelines for Online Partial Discharge Testing of Power Cables

Faults in the cable insulation Online PD testing is becoming the topic of interest for power cable owners to ensure the safe and continuous operation of power cables. If PD source is detected timely in the cable system, it could save the huge cost of unplanned outage to Plant owners. Regular periodic or continuous monitoring […]

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4 Practical Approaches To Minimize Voltage Drop Problems

What NEC states for max. voltage drop? The NEC states in an Informational Note that a maximum voltage drop of 3% for branch circuit conductors, and 5% for feeder and branch circuit conductors together, will provide reasonable efficiency of operation for general use circuits. For sensitive electronic loads, circuits should be designed for a maximum […]

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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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