Electric Motors Derating factors
Like any other power system equipment, motors need to be derated to suit a high ambient temperature. Equipment that are usually manufactured in America, UK and Europe are based on …
Transients In Low Voltage Electrical Systems
This paper provides a comprehensive review on the types of transients that may affect low voltage electrical systems and discusses various characteristics of lightning, switching, nuclear and intentional microwave impulses …
Power System Overvoltages and Insulation Coordination – Part 2
This is Part 2 of this series, the first part could be found here. Insulation coordination is the “selection of the dielectric strength of equipment in relation to the voltages …
Role of X/R Ratio in Circuit Breaker Short Circuit Duty Evaluation
Circuit breaker nameplates sometimes indicate only rating on symmetrical short circuit current. In such cases, the rating only reflects the AC component of the short circuit current. A common misinterpretation …
Practical Guide to Electrical Grounding
About the Book This book is designed for the contractor who finds that installing grounding systems, which are in compliance with all relevant codes and standards, is a complex and …
Power System Overvoltages and Insulation Coordination – Part 1
Note: This is the first part of power system voltages and insulation coordination. Insulation coordination is dealt with for three phase AC systems with nominal voltages Un > 1kV in …