Posted in Design on April 23rd, 2024
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 occurs when one compares the symmetrical short circuit current against the symmetrical short circuit current rating of the circuit breaker for the purposes of circuit breaker duty evaluation. This...
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 somewhat mystifying assignment. While in larger facilities, the design of a proper grounding system is certainly complex and should be left to a qualified engineer, the everyday grounding installations 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 IEC 60071. The insulation of equipment must be designed in such a way as to withstand all foreseeable voltage stresses or to limit the damage in insulation to the faulted...
Neutral Grounding
Introduction
In power system, grounding or earthing means connecting frame of electrical equipment (non-current carrying part) or some electrical part of the system (e.g. neutral point in a star-connected system, one conductor of the secondary of a transformer etc.) to earth. This connection to earth may be through a conductor or some other circuit element depending upon...
Posted in Design on April 15th, 2024
Understanding the Concept of Earthing In Electric Power System
Note: This is a paper published in the IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE), Volume 11, Issue 3 Ver. III (May. – Jun. 2016), pp. 29-33
Earthing is the concept of connecting a thing to the earth (or ground). In Power systems engineering, earthing is the one concept that cannot be dispensed with. Generators, reactors...