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FAQs: What has changed in V4.5?
Note: This FAQ is a legacy from older updates to PTW.  For the very latest version of PTW, click here. 

Users of PTW version V4.5 will notice a lot of changes since the previous releases of PTW.  These are summarised below:
 
New Features: General PTW 
  1. Import/Export Function: A datablock-style interface was developed to facilitate importing and exporting data to and from PTW project files. The Import/Export utility can be used to integrate PTW with other databases. 
  2. Energised/De-energised Display: An optional setting to display all de-energised branches in a different colour on SLDs was added. When breakers are opened and closed different parts of the system will become energised or de-energised. 
  3. Dynamic ATS Symbol: A new Automatic Transfer Switch (ATS) component is available on SLDs. 
  4. Dynamic Transformer Connection Symbol: Transformer symbols can be configured to display Delta , Wye, and Wye-Earth connection symbols automatically. 
  5. Parallel Branches: Implemented support for parallel branches in all study modules. 
  6. Power Factor Default: Added power factor field to Demand Load Library and function to pass the default power factor to Loads and Schedule Circuits when load type is selected. 
  7. User-defined Defaults: User-defined defaults are now available for all component data. The defaults are stored in a default project in the Library folder. 
  8. SLD Enhancement: Improved line routing on SLDs. 
  9. Zoom Previous: Added icon for zoom previous on SLDs. 
  10. Auto-Scroll: Expanded hit area of auto-scroll feature on SLDs so it now works when cursor is anywhere beyond the edge of drawing area. 
  11. Name Tag Location: New feature to re-set component Name Tag to default position on SLDs was added. A new feature to re-set the datablock position relative to the name tag was also added. 
  12. Expanded Group Print: Expanded Group Print to print an unlimited number of Documents. The previous limit was 500 documents. 
  13. Regenerative Drives: Expanded load component allowing negative kW entries to represent regenerative drives. 
  14. Spreadsheet Operation: Modified default behaviour of all spreadsheet entry to replace existing field rather than append to existing field when typing. 
  15. Datablock Selection: Modified default behaviour of datablock selection so that a double-click will apply selected datablock rather than edit datablock. 
  16. Datablock Append: New option to append multiple datablock fields together on a single line. For example: (1-185mm2, 60m) displays the quantity, size and length on SLDs. 
  17. Unlink Library: Added a check box to link or unlink component data with the library. Breaking the link with the library allows direct access to all component fields. 
  18. Transformer FLA: Added display fields for primary and secondary full load amp ratings calculated automatically from transformer kVA ratings. 

New Features: Panel Schedules 
  1. Power Factor Defaults: Panel loads now read default power factors from load type in demand load library. 
  2. Sequential Circuits: Panel now has option to display Alternating (1-3-5) or Sequential (1-2-3) Circuit numbers. 
  3. Circuit Start Number: Panel now has option to display circuit numbers starting with a user-defined number.
 
New Features: CAPTOR 
  1. New Library Entries: Over 200 new library entries are included in PTW V4.5 including devices from: Federal Pioneer, Merlin Gerin, Square D, GE, GEC and Multilin. 
  2. TCC Fault: New feature that displays coordination based on branch currents for a fault at one location. Device curves are terminated at the fault current each device sees for the specified fault location. 
  3. Distance Report: When the TCC Fault option is used the TCC report includes the fault current through each device and the associated trip time for each device. 
  4. Auto-Redraw: Modified interface to automatically redraw TCC curves when a device setting change is made, eliminating the need to click the redraw button. 
  5. SC Flag: Modified SC Flag to have the flag height based on a percentage of the Time Axis rather than a percentage of the lowest time axis value. 
  6. Global Label Change: New option to globally turn device name labels on and off on each TCC or for the entire project. When using datablocks on the TCC, it is better to include the device name in the datablock and turn the standard name labels off. 
  7. Reports: New title block selection for report name and improved report pagination options. 
  8. Disassociate: New option to disassociate SLD from TCC. 
  9. TCC Flags: New option to display pickup name with short circuit flag in amps. Previously the pickup and short circuit flags were both displayed in amps or by name. 

New Features: Arc Flash 
  1. IEEE 1584 Standard: New option to follow calculations as described in IEEE Standard 1584 in addition to earlier NFPA 70E-2000 calculations. 
  2. Motor Decay: New option to remove motor contribution from flash energy calculations after a user-defined time. 
  3. Energy Accumulation: Modified calculations to accumulate energy at each bus as branch contributions trip and when motor contributions are removed. Motors contributions can now be included, excluded, or included for a user-defined time. 
  4. Expanded Search: Expanded search to 5-branches for locating protective devices to determine trip times. 
  5. Label Printing: New option to group-print labels to 4-different Avery label sheet formats (1x1, 1x2, 2x2, 2x3). 
  6. Global Changes: New option to a selected group of arc flash entries. The global change is useful for changing working distance, breaker opening time, etc. 
  7. Improved Defaults: Implemented default values suggested in the IEEE 1584 Standard for working distances and bus bar gaps based on voltage level and equipment type. 
  8. Unlink: Buses on the Arc Flash Spreadsheet can be "unlinked" from the study results allowing you to enter fault currents and trip times manually. 

New Features: Equipment Evaluation 
  1. Switch Library: Added new Switch category in PTW library. 
  2. Bus Rating: Added option to specify series rating for bus components. 
  3. Multiple Functions: Evaluation checks were expanded to include all functions defined for each protective device. Previous versions only checked the first function defined for each device. 
  4. Marginal Classification: Added a new classification state of "Marginal" to the equipment evaluation report. Separate levels can now be specified for Marginal and Fail. 
  5. Branch Currents: A new option allows comparison of equipment ratings to ANSI and IEC branch currents. Previously the ANSI and IEC bus values were always used. 
  6. Study Specific Use: Fault rating comparisons may be run separately from Continuous rating comparisons. Previously the Pass/Fail was based on both Fault and Continuous rating comparisons. 
  7. Input Evaluation Report: A new report is available listing missing or invalid input data. The report lists the components that fail the input checks and provides details about what data are missing or invalid. 

New Features: Fault Analysis 
  1. Branch Arrows: Added branch arrows for all fault modules 
  2. Datablocks: Added datablock fields to store branch results for faults at either end of each branch. 
  3. IEC 60909 Datablocks: Added branch current datablocks for unbalanced fault conditions (SLE, LL, LLE faults). 
  4. IEC 60909 Summary Report: Removed detailed contribution data from standard IEC 909 fault report providing a more efficient summary format. The detailed report still lists detailed individual contribution information. 
  5. IEC 60909 - 2001 Revisions: Updated IEC 60909 fault module to comply with latest standard revision including: 
    • Added Kg factor for generators and synchronous motors. 
    • Changed motor q-factor to use motor kW-input rating instead of kw-output. 
    • Added modelling of off-nominal voltage and c-factor adjustment for Utility. 
    • Changed generator excitation selection (series 1, series 2) to be based on '< 1.6' (2.0 for salient pole) instead of '<= 1.6' (2.0 for salient pole). (small effects to Ik only). 
    • Removed all induction motor effects from Ik calculation (affects Ik only). 
    • Modified transformer factor to be applied only to transformer impedance calculation rather than being applied to the current calculation. 
    • Fixed problem related to excluding directly fed generators when combined with parallel groups of generators in Ik calculation (affects Ib and Ik calculation). 
    • Modified some internal calculations from scalar to vector addition. 
    • Added option to calculate Ik using Lambda x Ir method (Eq. 78), or modified Ib method (Eq. 75 w/o induction motors). 

New Features: Reliability 
  1. Switch Components: Added representation of disconnect switch components in reliability model. 
  2. Cost Units: Added cost units to library and project with consistency check. 

PTW V4.5 New Optional Study Modules 
 
IEC Standard 61363 Fault Analysis Module 
 
The IEC 61363 standard provides a short circuit calculation procedure intended for use on independent power systems fed from local generation including ships and off-shore installations. The methodology is designed to more accurately account for generator and motor contributions and decay rates than traditional fault calculations. 
 
DC System Analysis 
 
The DC Analysis modules include DC Load Flow, DC Short Circuit (ANSI & IEC), and Battery Sizing.
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