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Unbalanced/Single-Phase Study Module

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:

  • 1. Design better systems where single-phase distribution and unbalanced conditions may exist.
  • 2. Identify undersized circuits caused by unbalanced loads before problems occur.
  • 3. Set negative sequence relays based on unbalanced fault and load simulations to identify problems that would otherwise go undetected until damage occurs.
  • 4. Communicate designs more easily with professional reports and graphs.
  • 5. 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.