September 22nd, 2008
You are currently browsing the articles from circuitmaniac.com written on September 22nd, 2008.
After completing the electrical installation works of a new HV/EHV installation or making additions to an existing HV/EHV installation, the electrical contractor who carried out the installation works shall conduct the necessary pre-commission checks and tests and prepare the completion report in the prescribed format. The completion report shall be signed by the electrical contractor [...]
Written by John on September 22nd, 2008 with no comments.
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8.1 Introduction Relays are devices intended to protect electrical systems and equipements against damages caused due to abnormal operating conditions. In more technical terms, relays are devices designed to produce sudden pre-determined changes in one or more physical systems on the appearance of certain abnormal conditions in the physical systems controlled by them. Protective relays [...]
Written by John on September 22nd, 2008 with 3 comments.
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7.1 Introduction Earthing is a general term broadly representing grounding of power systems and bonding of equipment bodies to grounded electrodes. Earthing associated with current carrying power conductors, usually neutral conductor, is normally essential for the stability of the system and is generally known as system earthing. Earthing of non-current carrying metal works of equipment [...]
Written by John on September 22nd, 2008 with 3 comments.
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6.1 Introduction Cables for power distribution are mainly characterised by the material of the conductor, voltage grade, type of insulation, type of sheathing, type of armouring etc. Cables are designed to safely carry the current it is required to carry under normal operating conditions as well as abnormal conditions. To carry a current safely means [...]
Written by John on September 22nd, 2008 with 3 comments.
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5.1 Introduction Switching centres are the nerve centres of any electrical distribution system. These centres generally comprise of power control devices, bus chambers, switchgear chambers, cable alleys, control bus chamber, control wiring and protective relays and devices. The switching centres in industrial power distribution are usually classified as (i) Power Control Centres (PCC) (ii) Motor [...]
Written by John on September 22nd, 2008 with 3 comments.
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4.1 Introduction Installation of generators involves coupling of rotating machines and hence requires high degree ofengineering skill and competence, both mechanical and electrical. In order to ensure long and satisfactory life, it is necessary that the machine foundations have adequate strength, there is perfect alignment between the prime mover and the alternator and that the [...]
Written by John on September 22nd, 2008 with 2 comments.
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3.1 Introduction The reliability and trouble free service of a motor depend on the superiority of its electrical and mechanical design, the accuracy and care with which the components are manufactured and assembled and on the stringency with which the motor is tested at the manufacturer’s works and at the site of installation. The operational [...]
Written by John on September 22nd, 2008 with 1 comment.
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