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Harmonics 33433

Harmonic Analysis: A Detailed Procedure

Abstract – Power system harmonics can cause several problems including malfunctions of electrical equipment, premature equipment failures and unnecessary plant shutdowns. Therefore, harmonic mitigation is considered to be an important target, particularly for industrial applications where even a small downtime has the potential to lead to a significant economic loss. Harmonic analysis in such cases are […]

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Arc Flash Hazard Labeling

Arc Flash Hazard Labeling: The Do’s and Don’ts

With industry adopting NFPA 70E as the consensus electrical safety standard, Australian facilities and many of their counterparts worldwide are performing arc flash hazard studies to label their electrical equipment for safety. The requirement for arc flash hazard labelling is now found in AS3007 and is in line with the WHS regulations.. There are many […]

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Harmonics

Power System Harmonics

 New Technology Brings New Challenges Power system harmonics are the by-products of modern electronics. They are especially prevalent wherever a notable portion (25% and above) of the electrical load is nonlinear such as switched mode power supplies, variable speed drives, and other equipment that draws current in short pulses. While nonlinear equipment is designed to […]

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Protection and Control

Protection and Control

Equipment behaviour during short-circuits There are 2 types of system equipment, the type that intervenes and the type that does not intervene at the time of a fault. Passive equipment This category comprises all equipment which, due to its function, must have the capacity to transport both normal current and short-circuit current without damage. This equipment includes cables, lines, […]

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heat-most-common-cause-motor-failure

Heat – The most common cause of motor failure

Service life degradation Heat is known to be the most common cause of premature motor failure. As a rule of thumb, every 10 degrees centigrade of increase in the motor’s winding temperature, above the rated temperature , halves the life of the windings insulation system. This hold true even if the motor was temporarily subjected to such a […]

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short-circuit-switching-making-and-breaking-capacity

Short-Circuit Switching Capacity

Defining Switching Capacity The switching capacity is the r.m.s value of a current at a given power factor (cos φ) as well as a given rated voltage at which a switchgear or a fuse can still shut-off under specified conditions in an operationally safe way. Both the short-circuit making capacity as well as the short-circuit breaking capacity of circuit breakers must […]

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