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SHORT CIRCUIT & OVERCURRENT PROTECTIVE
DEVICES COORDINATION STUDY
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ARC FLASH HAZARD ANALYSIS
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The Three-Phase Alternator, Lab Reports of Electric Machines
The terms alternating current generator, synchronous generator, synchronous alternator and alternator are commonly used interchangeably in engineering literature. Because synchronous generators are so much more commonly used than induction generators, the terms alternator, as often used, and as used here, applies only, to synchronous generators.
Typology: Lab Reports
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SHORT CIRCUIT & OVERCURRENT PROTECTIVE
DEVICES COORDINATION STUDY
ARC FLASH HAZARD ANALYSIS
Introduction :
According to NFPA 70E (the relevant standard from the National Fire Protection Association), Arc Flash is a dangerous condition associated with the release of energy caused by an electrical arc. It is measured in terms of arc flash incident energy E (AFIE), which is used to determine the level of Personal Protective Equipment (PPE), and in terms of an arc flash protection bound- ary (FPB).
CSA Z462, Workplace Electrical Safety Standard is a standard of the Canadian Standards Asso- ciation. It is based on and was developed in parallel with U.S. National Fire Protection Associa- tion (NFPA) standard NFPA 70E, Standard for Electrical Safety in the Workplace. Attempts have been made to harmonize Z462 with NFPA 70E as much as practicable for Canadian work- places.
NFPA 70E and IEEE 1584 Standards provide the formulas for calculation of the flash protection boundary and the incident energy , which defines the minimum PPE requirements.
Scope of Work: The power system study consisted of a fault current study, a protective device coordination study with associated suggested device settings (if applicable), an arc flash study, and any comments and recommendations where necessary.
Using Etap Software Version 12.6 , a computer model of electrical distribution system was cre- ated based on the information gathered by drawings and site measurements .This model was then used to study the electrical system and run various calculations. The results of the calculations are contained in this report.
Assumptions and clarifications :
1- The Medium Voltage load flow and Hydro transformer details are not available, hence the fol- lowing input were assumed : MVA SC = 500MVA X/R = 8 Zsc =5.75%
2- The Provided single load diagram illustrate the total connected load, the demand load were not provided , hence the demand load for dwelling units are calculated according OESC 16th^ edi- tion section 8.
3- The main cable from Hydro Transformer details are not available, the size assumed according OESC tables.
Despite the above inputs are not available, the assumption were made as per applicable standards and common practice similar to previous approved job, therefor the results and outputs of this study are accurate.
Appendix A :
A- System Modelling using Etap :
B- Load Flow results :
C- Short Circuit Report
G- Arc Flash Labels :