Design

IEC-IEEE

Comparison of IEC and ANSI Terminology

When performing designs where mixed standards are used, there will be lots of confusions along the process. These confusions will one way or another affect the result of the project in terms of delivery time,…

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Rotating-machine Reactance Multipliers

The momentary or first cycle current is used to evaluate the closing or latching of the high voltage circuit breaker. Other selection criteria are the interrupting and symmetrical short circuit currents. The sub-transient reactance of…


Advantages of Per Unit and Percent Calculations

Power System analysis software are very expensive beyond the reach of small and medium enterprises. The only option, when fault analysis is required, is to perform calculations manually using available resources such calculators or desktop…


Safety Against Overvoltages

Overvoltages are unwanted potentials occurring in electrical systems between a phase conductor and the earth or ground, or between phase conductors having a peak value greater than the peak of the largest nominal or RMS…


Motor Protection -Direct Temperature Sensing

The service life of electric motors is dependent on two (2) main components: Electrical components (i.e. windings & insulations); Mechanical components (i.e. core, shaft, bearings, frame and cooling system). The most common causes of electric…


Objectives of Grounding System

To ground or not to ground is a decision that an Electrical Engineer needs to make when planning or modifying an electrical power distribution system. The decision is dependent on the requirement of the loads….


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