| Unbalanced/Single-Phase
Study Module |
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PTW
Unbalanced Studies simulates systems with single-phase,
two-phase and unbalanced three-phase load conditions.
Phase and sequence currents can be displayed for different
operating and load conditions including open-phase
and simultaneous faults. Studies include demand load
analysis, sizing, load flow/voltage drop and short
circuit. Reports also include three-phase and single-phase
panel schedules. Modeling includes single-phase, two-phase
and three-phase lines, transformers, loads, and capacitors
as well as single-phase mid-tap transformers.
Benefits:
Design better systems where single-phase distribution
and unbalanced conditions may exist.
Identify undersized circuits caused by unbalanced
loads before problems occur.
Set negative sequence relays based on unbalanced fault
and load simulations to identify problems that would
otherwise go undetected until damage occurs.
Communicate designs more easily with professional
reports and graphs.
Evaluate alternatives quickly and easily to establish
an optimal design.
Interface Options:
Display phase or sequence values with magnitude only,
magnitude and angle, magnitude and power factor, or
real and imaginary.
Display individual phase values, maximum phase, or
phase summation.
Represent any combination of 1-phase, 2-phase and
3-phase systems including systems with mid-tap transformers.
Shares common interface with balanced DAPPER studies,
harmonic analysis, transient stability, equipment
evaluation, reliability, and CAPTOR protective coordination
modules.
Analysis Options:
Connected, demand and design load analysis for each
phase.
Cable and transformer sizing based on design load
of largest phase.
Load flow and voltage drop through each 1-phase, 2-phase,
and 3-phase branch.
Representation of transformer automatic Load-Tap-Change
(LTC) options.
Representation of mid-tap transformers.
Representation of transformer no-load losses.
Short circuit calculations including individual or
simultaneous faults at different locations and on
any phase combinations.
Optional capacitance to earth representation.
Unbalanced load representation in three-phase and
single-phase panels and sub-feeds.
Cable parameter calculator.
Sequence to Phase and Phase to Sequence impedance
conversions.
Transmission line parameter calculator including multiple
circuits, bundling, transposition, and line sag effects.
Typical Applications:
City distribution systems with three-phase and single-phase
feeds.
Rural utility distribution systems with three-phase
and single-phase feeds.
Campus distribution systems.
Industrial plants to identify normal and abnormal
unbalanced conditions.
Commercial and institutional buildings with three-phase
and single-phase loads and panels.
Setting negative sequence relays to detect abnormal
unbalanced conditions.
Windows Software and Hardware
Requirements
Windows 95, 98, ME, NT, 2000, or XP;
500 MHz processor or better;
500 MB hard disk space;
128 MB of RAM (512 MB for projects with 2000+ buses);
CD-ROM drive;
Printer or plotter recommended.
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