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Inspection of electrical installations in home (2)
Inspection of electrical installations in home Continued from part I – Inspection of electrical installations in home (part 1) Is a Periodic Inspection Needed?Every installation deteriorates with use...
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Measurement of insulation resistance (IR) – Part 2
Fluke insulation resistance tester up to 10kV - Allows testing of high voltage systems such as control gears, engines, generators and cables. It can be adjusted to all testing voltages that are...
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Meggering (insulation resistance testing) of dry-type power transformer
MEGGER - Insulation resistance test deviceThe insulation resistance test (meggering) is of value for future comparison and also for determining if the transformer is to be subjected to the applied...
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Fundamental Concepts of Insulation Testing
Fundamental concepts of insulation testing (on photo Digital Surge/ HiPot / Resistance Tester on site) IntroductionProbably 80% of all testing performed in electrical power systems is related to the...
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Basics of 3-phase Induction Motor (part 2)
Basics of 3-phase Induction Motor (part 2) Continued from first part – Basics of 3-phase Induction Motor (part 1)For the purpose of standardization, the preferred rated voltages of three phase...
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Right Choice of Dry Type or Liquid-Filled Transformer
Right Choice of Dry Type or Liquid-Filled Transformer (on photo Dynapower Corporation transformers)Content1. Two Types of Transformers 2. Cooling and insulating system 3. Losses 4. Operating Life of...
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Definition of Basic Insulation Level (BIL)
Definition of Basic Insulation Level (BIL) - photo by bob1217 @ FlickrIntroduction to BILInsulation levels are designed to withstand surge voltages, rather than only normal operating voltages. Since...
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Inspection and Test Procedures for Metal-Enclosed Busways
Inspection and Test Procedures for Metal-Enclosed BuswaysContentVisual and Mechanical InspectionElectrical TestsTest ValuesTest Values – Visual and MechanicalTest Values – ElectricalTables:TABLE 100.12...
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Differences Between Earthed and Unearthed Cables
Differences Between Earthed and Unearthed CablesIntroductionIn HT electrical distribution, the system can be earthed or unearthed.The selection of unearthed or earthed cable depends on distribution...
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Selection of Induction Motors for Industrial Applications (part 2)
Selection of Induction Motors for Industrial Applications (part 2) - photo by TCD Systems Continued from first part: Selection of Induction Motors for Industrial Applications (part 1) Design...
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Electrical Preventive Maintenance of Air Circuit Breakers
Electrical Preventive Maintenance of Air Circuit BreakersRecommended minimum practice for preventive maintenanceInsulationRemove and clean interphase barriers. Clean all insulating materials with...
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Why is Continuous On-line Monitoring of Partial Discharge in the Switchgear...
Why is Continuous On-line Monitoring Partial Discharge in the Switchgear Necessary? (on photo: 11kV voltage transfromer spout failure in progress – Located by Partial Discharge survey; by...
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4 Essential Qualities Of Electrical Protection
4 Essential Qualities Of Electrical Protection (on photo protection relat panel by powersystemsmasters.com)Fundamental Protection RequirementsIn generating stations, all electrical circuits and...
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Degradation of Insulation in Switchgear (What’s Really Happening)
Degradation of Insulation in Switchgear (why you should take it seriously); photo credit: Schneider ElectricPartial Discharge (PD)Electrical insulation is subjected to electrical and mechanical stress,...
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6 Transformer Types You Can See In Commercial Installations
6 Transformer Types You Can See In Commercial Buildings (photo credit: iml.bg)Transformer Types and their CharacteristicsTransformers in commercial installations are normally used to change a voltage...
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5 Components of Current Drawn by the DC Voltage Testing of Insulation
Current drawn by the insulationWhen DC voltage is applied to an insulation, the electric field stress gives rise to current conduction and electrical polarization. Consider an elementary circuit as...
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7 Methods To Avoid Insulator Flashovers
Transmission Line Insulator FlashoversContamination caused insulator flashovers produce frequent outages in severely contaminated areas. Lines closer to the ocean are in more danger of becoming...
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Where Do Electrical Faults Occur The Most?
Causes of electrical faults // A fault is not a natural occurrence. It is an unplanned event which occurs unexpectedly. Electrical faults in an electrical installation or piece of equipment may be...
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Better understanding of transformer failures and maintenance necessity
Transformer failures Generally speaking, the transformer requires less care compared to other electrical equipment. But, as I already stated in some of the earlier technical articles, transformer...
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What Would Be The Best Conductor Material for Electrical Cables
Al or Cu conductor… The conductivity of copper is 65% higher than that of aluminium which means that the conductor size of similarly rated cables is proportionately smaller. Correspondingly less...
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