3c Short Circuit Equipment Duty Interpretation.pdf
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- Solicitation number
- 36C25925Q0292
About this file
The document is an Equipment Duty Schedule, which provides a detailed guide for interpreting electrical equipment fault current analysis. The document explains the structure and meaning of various technical parameters in the schedule, including section headers, table headers, and key terminology related to electrical equipment ratings and duties.
The schedule covers critical technical details such as bus names, base kilovoltage, equipment identification, manufacturer information, and fault current ratings. It defines important terms like "½ Cycle kA" (momentary fault current), "Int kA" (interrupting fault current), and provides interpretation guidelines for "Violation" and "Warning" comments. These comments indicate whether equipment is exposed to fault currents that exceed its rated capacity, with a "Warning" status signifying the equipment is within 5% of its fault current rating and potentially at risk.
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Equipment Duty Schedule
Equipment Duty Schedule Page 1
The following is provides to aid in reading and understanding the information provided in the Equipment Duty Schedules.
SECTION HEADER
1st Line – Identifies Easy Power Software and Version #, Date of last entry or Creation date, and Path and electronic file name.
The right side of the page includes the current page number and the total number of pages included in this schedule.
2nd Line – Software Creator ESA, Inc 3rd Line – Comments Specific to this Report 4th Line – Identifies Fault Type and Per Unit Voltage
TABLE HEADERS
BUS – Includes Bus name and Base kV
Bus name uses the same naming convention as the one-line and short circuit analysis report which identifies equipment location within the system.
Base kV lists the bus and associate equipment operating voltage and in turn establishes the Standards governing equipment ratings.
EQUIPMENT – Includes entries for ID, manufacturer, style and test standard.
Equipment ID identifies the equipment being evaluated.
The term “Main” indicates the equipment has a main breaker.
The term “Lowest” indicates equipment evaluated on bus bracing only.
Equipment Manufacturer: Name of equipment manufacturer
Equipment Style: Lists equipment type and/or model.
RATINGS – Includes entries for ½ cycle kA, int kA, int cycles.
½ Cycle kA: available ½ cycle momentary fault current in kilo amps at this location.
Int kA: are the available interrupting fault current in kilo amps at this location.
Int Cycles: indicates the number of cycles after fault inception the interrupting fault current are calculated.
DUTIES – Includes ½ cycle kA, ½ cycle percent, int kA, int Percent.
½ Cycle kA: Lists the equipment’s momentary rating in kilo amps.
Equipment Duty Schedule Page 2
½ Cycle Percent: Lists in percent (above or below (minus)) the equipment’s rating versus exposure to available momentary fault currents.
Int kA: Lists the equipment’s interrupting rating in kilo amps.
Int Percent: Lists in percent (above or below (minus)) the equipment’s rating versus exposure to available interrupting fault currents.
COMMENTS:
“Violation” indicates a piece of equipment is exposed to fault currents which exceeds the equipment’s rating.
“Warning” indicates a piece of equipment rating is below but within 5% of the fault current rating based on calculation. Precision of the short circuit calculations could be viewed as not exact but with a tolerance of approximately +/- 5%. Therefore, equipment designated with a “Warning” could be exposed to its fully rating.
File details come from the government source that posted it. Updated .