Category Archive for: «Energy and Power»

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Energy Efficiency Aspects of Electric Motors

Load Efficiency Three-phase squirrel-cage induction motors comprise a considerable percentage of the electrical load in the United States. Design, operation, and maintenance of these machines is well described in some of the articles already published. This technical article focuses on their energy efficiency aspects. Induction motors typically range in full load efficiency from about 87% […]

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Maintenance Management Of Electrical Equipment (Condition Monitoring Based) – Part 6

Read previous parts of this serie – Part 1 | Part 2 | Part 3 | Part 4 and Part 5 Content: Proper Use of Predictive Technologies Merits and Demerits of CDM program Advantages Disadvantages CDM is more than maintenance Conclusion Proper Use of Predictive Technologies System components, such as circuit breakers, transformers, cables, etc. are an integral part of the electrical system […]

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The need for electric energy is never ending

Distributed generation As you guess, yes, the need for electric energy is never ending. Along with the growth in demand for electric power, sustainable development, environmental issues, and power quality and reliability have become concerns. Electric utilities are becoming more and more stressed since existing transmission and distribution systems are facing their operating constraints with […]

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Rating Definitions Applied to Low Voltage Molded-Case Circuit Breaker (MCCB)

For system protection 600V and below The molded-case circuit breaker is the “workhorse” for system protection 600V and below. A circuit breaker is a device designed to open and close by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating. The following terms apply […]

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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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Maintenance Management Of Electrical Equipment (Condition Monitoring Based) – Part 5

Read previous parts of this serie – Part 1 | Part 2 | Part 3 | Part 4 Preliminary preparation phase for CDM in the working industry In case of new industry, it would be easy to implement Condition Monitoring based Maintenance Management (CDM) as apart of respective equipment or system itself after evaluating various factors discussed in previous part 4 of […]

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14 terms of particular importance when discussing arc flash hazards

Electrical arcs Electrical arcs form when a medium that is normally an insulator, such as air, is subjected to an electric field strong enough to cause it to become ionized. This ionization causes the medium to become a conductor which can carry current. The phenomenon of electrical arcing is as old as the world itself. Lightning is […]

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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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Maintenance Management Of Electrical Equipment (Condition Monitoring Based) – Part 4

Read previous parts of this serie – Part 1, Part 2 and Part 3 Implementation of Condition Monitoring based Maintenance (CDM) program After deciding to go for the implementation of CDM based on evaluation of various factors discussed in foregoing points and other factors, if any, as per the company policy, it is discussed hereunder how the industry […]

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Rating Definitions Applied to Medium Voltage Circuit Breaker

MV protection applications The medium voltage circuit breaker is the device of choice when sophisticated system protection at the medium voltage level is required. Most modern medium voltage circuit breakers use a vacuum as the interrupting means, although sulfur-hexafluoride (SF6) based units still exist and in use. Most modern medium voltage circuit breakers are rated on […]

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