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220V DC System at Thermal Power Station
UPS Battery & Critical Reserve Power (photo by Infinity Power Solutions) The 220V DC system supplies direct current as source of operating power for control, signaling, relays, tripping and...
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Sudden pressure relay in oil-filled power transformer
Figure 1 - Sudden pressure relay in oil-filled power transformer Internal arcing in an oil-filled power transformer can instantly vaporize surrounding oil, generating gas pressures that can cause...
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Inspection of electrical installations in home (part 1)
Electrical installations in home Europe has an ageing housing stock. There are many homes with outdated wiring. This wiring is deteriorating, has been inappropriately amended, or is insufficient for...
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Inspection of electrical installations in home (part 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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Direct On Line (DOL) Motor Starter
Direct Online Motor Starter - Square DDifferent starting methods are employed for starting induction motors because Induction Motor draws more starting current during starting. To prevent damage to...
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Measurement of insulation resistance (IR) – Part 1
Megger MIT1020 10-kV insulation resistance testers are all designed specifically to assist the user with the testing and maintenance of high voltage equipment. IntroductionThe measurement of...
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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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How to Maximize Chiller Efficiency?
How to Maximize Chiller Efficiency? (on photo Carrier Chiller Water Cooled)IntroductionChillers are the single largest energy-using component in most facilities, and can typically consume over 50% of...
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How to Predict Life Span of the Switchgear?
How to Predict Life Span of the Switchgear? (photo by Milos Diskovic)Load and Number of Switching CyclesThe life span of switchgear basically depends on the size of the load and the number of...
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Defining Size and Location of Capacitor in Electrical System (2)
Defining Size and Location of Capacitor in Electrical System (2) Continued from part 1: Defining Size and Location of Capacitor in Electrical System (2) Content Size of circuit breaker (CB), fuse and...
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Guidelines For The Construction And Maintenance Of Transmission Lines
Guidelines For The Construction And Maintenance Of Transmission Lines (photo by Mike Lawrence: An S64F Erickson Air-crane flies off with a section of lattice tower that will be transported to a...
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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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An example of calculating transformer size and voltage drop due to starting...
Medium-voltage motor starting transformer (man. J. Schneider Elektrotechnik; photo credit: DirectIndustry)ExampleLet’s calculate voltage drop in transformer 1000KVA, 11/0.480 kV, impedance 5.75% due to...
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The most common accessories you can find on oil filled transformer
The most common accessories you can find on oil filled transformerAccessoriesEvery oil filled transformer has a variety of accessories for different purposes. Here, I’ll try to name the most common of...
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A transformer is only as strong as its weakest link
Electric arc furnace transformer – AlstomTransformer ratingCapacity (or rating) of a transformer is limited by the temperature that the insulation can tolerate. Ratings can be increased by reducing...
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Maintenance and inspection of the transformer bushings
Maintenance and inspection of the transformer bushings (photo credit: Bradley Woods via Flickr)Six different inspectionsThere are six different inspections to be performed on the bushings of the power...
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Maintenance Management Of Electrical Equipment (Condition Monitoring Based) –...
Condition monitoring based maintenance management of electrical equipment (on photo: Performing the manufacturer’s recommended maintenance and testing of a circuit breaker will extend the equipment’s...
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Maintenance Management Of Electrical Equipment (Condition Monitoring Based) –...
Maintenance Management Of Electrical Equipment (Condition Monitoring Based) – Part 2 (photo credit: fluke.com) Continued from the first part of this technical article… Read it here. Predictive...
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Maintenance Management Of Electrical Equipment (Condition Monitoring Based) –...
Maintenance Management Of Electrical Equipment – Condition Monitoring Based, part 3 (photo credit: armcoilafrika.co.za Read previous parts of this serie – Part 1, Part 2 Decision for Condition...
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Maintenance Management Of Electrical Equipment (Condition Monitoring Based) –...
Maintenance Management Of Electrical Equipment (Condition Monitoring Based), Part 4 – on photo: Testing and maintenance at 500kV power plant Read previous parts of this serie – Part 1, Part 2 and Part...
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