A_FAULT provides fault calculations in full compliance with the ANSI C37 standards.
It offers separate solutions for low, medium and high voltage systems and for symmetrical,
momentary and interrupting calculations as defined in the standards.
For medium and high voltage systems, the momentary and interrupting values may be
calculated using either the E/X or E/Z methods permitted by the standards. Both ac and
dc decrement curves required by the total current rated standard (C37.5) and the
symmetrical rated standard (C37.010) are used by the program.
Benefits:
Design safer power systems by calculating equipment ratings per ANSI standards.
Save time by automatically applying ANSI C37 and IEEE 141 multiplying
factors to generators and motors.
Increase efficiency with custom data reporting featuring X/R, E/X or E/Z methods
and values for the application of low, medium, and high voltage breakers.
Communicate effectively with quality reports.
Features:
Reports three-phase, single-line to ground, line to line, and double line to
ground fault values.
Reports values for both total current and symmetrical rated breakers.
Models transformer primary and secondary taps and o ff nominal rated voltages.
Use either ac/dc, dc only, interpolated or no ac decay options.
Reports calculated remote/local status for each generator.
Interrupting study reports total and symmetrical 2, 3, 5, 8 and 30 cycle values.
Complies with ANSI standards and IEEE recommended procedures.
Provides separate network solutions for reporting X/R values.
Momentary and interrupting studies can report E/X or E/Z values.
Low voltage study complies with ANSI C37.13.
Momentary and interrupting studies comply with ANSI C37.010 and C37.5.
Custom reports using datablocks or crystal reports.
Display study results on the one-line.
User defined pre-fault voltage.
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A_FAULT Versus DAPPER Traditional Fault Analysis
A_FAULT follows ANSI C37 standards for calculating
equipment ratings.
DAPPER follows a traditional Ohm’s Law calculation
for fault current.
For Low voltage systems (600V and below), the calculations
are the same except for two items:
1) A_FAULT calculates the X/R ratios based on separate
X and R networks whereas DAPPER uses a single complex
network.
2) A_FAULT uses the X/R/ ratio to adjust the calculated
short circuit value to compare directly with molded
case and power circuit breaker ratings based on ANSI
test power factor. In other words, the calculated
short circuit value is increased if the X/R/ ratio
is larger that the ANSI test power factor.
For Medium and High Voltage systems (above 600Volts):
The momentary calculations are similar. The largest
difference is in Interrupting Calculations: A_FAULT
uses the ANSI C37 tables and curves to simulate AC
and DC decay for interrupting calculations, whereas
DAPPER accounts for the system DC decay but ignores
the AC machine decay in all cases.
Click
here for a detailed comparison
