Category Archive for: «Energy and Power»

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Miniature Circuit Breakers (MCBs) For Beginners

Dual functions of a switch and a fuse This technical article focuses on the widely used miniature circuit breakers rated for 240 V or less. These are smaller and lower-rated versions of industrial-grade molded-case circuit breakers rated for 600 V or less. These miniature breakers, called air circuit breakers, are based on thermal, magnetic, or […]

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Sizing a Static UPS System In Data Center

UPS system serving a data center Choosing the power of a static UPS system serving a data center is a decision that involves various elements and which cannot be made before, or independently from, the choice of distribution scheme. The main elements to consider can be summarised as follows: Two from the following parameters of the […]

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The Most Common LV/MV Motor Starting Devices

Two-state ON-OFF device The most common motor starting device is the low voltage motor-starting contactor. A contactor is defined as “a two-state ON-OFF device for repeatedly establishing and interrupting an electric power circuit.” Contactors are designed for optimum performance and lifetime when switching loads; they are not designed for interrupting short-circuit currents and therefore motor circuits require separate […]

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The Consumer Power Substation With Metering On Medium Voltage Side

Nominal voltage 1kV – 35kV A consumer power substation with metering on medium voltage side is an electrical installation connected to a utility supply system at a nominal voltage usually between 1kV – 35kV, which for example may supply a single MV/LV transformer (exceeding generally 1250 kVA), several MV/LV transformers or one or several MV/LV secondary […]

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4 Types of DC Motors and Their Characteristics

Characteristics As you already know, there are two electrical elements of a DC motor, the field windings and the armature.The armature windings are made up of current carrying conductors that terminate at a commutator. DC voltage is applied to the armature windings through carbon brushes which ride on the commutator. In small DC motors, permanent […]

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Hey engineers, wish you all the best in 2015!

At your service! Well, it’s been a long year with a lot of published technical articles and gained knowledge in the field of electrical engineering. EEP’s team payed special attention to the technical articles related to power substations and industry automation from the point of practical experience. Also, many useful engineering guides and tools were […]

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Factors Affecting Transient Stability

Transient System Stability A power system may be said to have transient stability if the various generating stations will regain equilibrium following a periodic system disturbances. System disturbances which cause the greatest trouble are those due to line faults. Transient stability studies are essentially a study of the momentary-speed changes of rotating equipment, which are functions of their […]

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8 NEC Basic Feeder Circuit Sizing Requirements

Feeder circuit loads Once the branch circuit loads are calculated, the feeder circuit loads may be calculated by applying demand factors to the branch circuit loads. General Lighting Loads (Article 220.42) Show window or track lighting (Article 220.43) Receptacles in other than dwelling units (Article 220.44) Motors (Article 220.50) Fixed Electric Space Heating (Article 220.51) […]

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Danger And Control Of Static Electricity Buildup

Troubles that you can run into… The following are the dangers posed by static electricity: Ignition causing fire or explosion Damage to sensitive electronic components Electric shock to humans followed by accidents such as a fall Damage to mechanical components such as bearings due to sparking through the oil films on bearing surfaces. It is necessary […]

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Bonding of isolated, common and integrated grounding systems as a means of surge proofing

Clean vs Dirty Ground In this article we covered in detail the physics related to lightning phenomenon and how the surges due to lightning strokes are safely conducted to ground using a lightning protection system consisting of air terminations, down conductors and grounding electrodes. Both these grounding systems are inherently noise prone, since conduction of […]

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