3b Short Circuit LV Monentary Report Interpretation.pdf
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- 36C25925Q0292
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The document is a Low Voltage Momentary Report Interpretation guide that provides detailed explanations of technical parameters and table headers for electrical fault analysis. The guide breaks down key sections including the Section Header, which identifies software details and page information, and Table Headers that explain complex electrical engineering metrics such as Faulted Bus, Fault Duties, Asymmetrical Current, and Fault Contributions. Specific technical definitions are provided for terms like Thevenin Equivalent fault current, voltage per unit, power factor phase angle, and sequence resistance/reactance, which are used to analyze electrical system fault characteristics and impedance at specific locations.
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Low Voltage Momentary Report
Low Voltage Momentary Report Page 1
The following is provides to aid in interpreting and understanding the information provided in the Low Voltage Momentary Report.
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
TABLE HEADERS
FAULTED BUS – Includes Bus name, Base kV, 3 Phase and Voltage per unit value Bus name: uses the same naming convention as the one-line and short circuit analysis report which identifies faulted bus location within the system.
Base kV: lists the bus and associate operating voltage.
3 Phase: identifies the fault type as being a 3 phase bolted fault.
Vpu:-voltage per unit expresses the system voltage as fractions of the base unit.
This simplifies calculations where different voltages are present in a system.
FAULT DUTIES – Includes entries for E/Z (kA), MVA, Degree, X/R, R1 (pu), X1 (pu), R0 (pu), and X0 (pu).
E/Z (kA): The Thevenin Equivalent (symmetrical) fault current in kilo amps at this location.
MVA: The Thevenin Equivalent MVA fault value at this location.
Degree: The voltage to current phase angle. This is used to determining the power factor (P.F.).
X/R: The ratio of reactance and effective resistance of the effective system fault impedance at this location.
R1 (pu): Positive sequence resistance from the point of the fault.
X1 (pu): Positive sequence inductive reactance from the point of the fault.
R0 (pu): Zero sequence resistance from the point of the fault.
X0 (pu): Zero sequence inductive reactance from the point of the fault.
ASYM CURRENT – Includes entries for kA (1.6*Isym) and kA (based on X/R).
Low Voltage Momentary Report Page 2 kA (1.6*Isym): Maximum asymmetrical current based on a factor of 1.6 times the symmetrical fault current.
kA (based on X/R): Asymmetrical fault current based on the fault impedance X/R ratio.
CONTRIBUTIONS in kA – Includes entries for the “from bus”, “to bus”, kA, Deg, device and Branch.
From Bus: list the adjoining buses directly contributing to the faulted bus.
To Bus: list the faulted buses.
kA: Fault current in kilo Amps contributed by “from bus”.
Deg: The power factor phase angle for contributed fault current.
Device: Indicates the type of contributing source.
Branch: Indicates the name of the adjoining equipment feeder (conductors, cables, busways, etc.)
Definitions:
BWY designates busway in this report.
File details come from the government source that posted it. Updated .