CEE Relays Ltd

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Power*Tools for Windows (PTW) Software
PTW is a market-leading power systems analysis software package developed by SKM Systems Analysis Inc.  
CEE is the official distributor in the United Kingdom and Ireland and can offer sales, software rental, over-the-phone support and training.

Already a PTW user?  See our User Resources page for FAQs, downloads, training and more.

CEE can also perform systems studies of your network on your behalf, or verify a PTW model you have created. Click here for more information.
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Who uses PTW?  Click here for a list of some of our clients.  

PTW version V9.0 is now available!  Existing PTW users can download the full program on our User Resources page.  For a downloadable brochure explaining the difference between PTW V8.0 and V9.0, click here. 
PTW is a modular program with different components performing specific power systems analysis functions.  Users can customise their PTW license depending on which modules they need; additional modules can be added later if necessary.  A complete list of these modules is provided below.  We can also offer standalone software for certain specific tasks which are not part of the PTW suite. 
Select a module for a brief summary of its function and a link to a full description and downloadable brochure:
CAPTOR produces time versus current coordination drawings with single-line drawings (SLDs) and setting reports. It lets you coordinate protective devices with interactive on-screen graphics, and provides a comprehensive library. 

CAPTOR may be used on any electrical power system including utility, industrial, commercial, manufacturing, and process systems. Devices may be plotted at any voltage, current or application frequency. A comprehensive library containing protective devices from all of the popular equipment manufacturers is included. CAPTOR's advanced device modelling and curve fitting techniques make library additions fast and easy.

Click here for more information

Do you need a system to automatically evaluate coordination between protective devices?  Also consider the Coordination Evaluation module.
DAPPER is an integrated set of modules for three-phase power system design and analysis including rigorous load flow and voltage drop calculations, impact motor starting, traditional fault analysis, demand and design load analysis, feeder, raceway and transformer sizing, and panel, MCC, and switchboard schedule specification.

Click here for more information.
Example on the left: Calculations in DAPPER can be added to single-line diagrams (or used in reports or other calculations).  In this case, single- and three-phase short-circuit contributions from each generator and motor are shown on an SLD, along with fault levels for a bus-bar and a cable. 
PTW IEC_60909 calculates short-circuit currents using the equivalent voltage source as required by the IEC60909 standard. With PTW IEC_60909, three-phase and unbalanced fault duties for electrical power systems are calculated in compliance with the IEC60909 standards for low, medium, and high voltage systems.

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The IEC_61363 Short Circuit Study module calculates the current that flows in an electrical power system under abnormal conditions. These currents must be calculated in order to adequately specify electrical apparatus withstand and interrupt ratings and selectively coordinate time current characteristics of electrical protective devices. 
The IEC_61363 Short Circuit study represents conditions that may affect typical marine or offshore installations more significantly than land-based systems, including more emphasis on generator and motor decay.

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A_FAULT provides short-circuit 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.

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The Transient Motor Starting Analysis module (TMS) is a state-of-the-art time simulation program to analyse all aspects of motor starting problems accurately. 

TMS models up to 1,500 motors dynamically throughout starting, stopping or reacting to load changes. In order to completely examine motor starting problems, TMS has the capability to dynamically represent motors which are already on line at the beginning of the simulation. 

The complete network is continuously modelled throughout the time simulation in order to properly represent the interactions between motors and to be able to examine the effects of static loads, transformer taps, generator voltage set-points, and all other network parameters.
The Equipment Evaluation Study module compares protective device ratings with short-circuit calculations. The program also checks for missing input data and compares continuous ratings to calculated design and operating conditions. Any equipment that fails the evaluation is reported in tabular form and colour-coded on the SLDs. Equipment Evaluation uses the same project database as all other PTW study modules, integrating all balanced and unbalanced/single-phase study modules, and allowing you to examine existing projects without additional input requirements.

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The DC System Analysis modules include Battery Sizing, DC Load Flow, DC Short Circuit (ANSI), and DC Short Circuit (IEC).

The DC Systems Analysis tools are ideal for modelling both large- and small-scale direct current distribution and transmission.  

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PTW I*SIM is a program for transient stability analysis. It is designed to simulate system response during and after transient disturbances such as faults, load changes, switching, motor starting, loss of utility, loss of generation, loss of excitation, and blocked governor events. I*SIM is designed to study today's most challenging simulation problems in one convenient and easy-to-use program. 
HI_WAVE simulates resonance and harmonic distortion in industrial, commercial, and utility power systems. 
Harmonic current and voltage sources may be defined at multiple locations in the power system. Capacitor banks, single tune filters and high pass filters may be included in the voltage and current distortion evaluation, impedance resonance scans, and in harmonic load flow results. 
Any type of system design, with any combination of voltage levels may be evaluated with this highly interactive, user friendly software. 
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.  

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Distribution Reliability calculates reliability indices and cost effects for alternative system designs. Calculations include alternative supplies, alternative network configurations, spare equipment, time to repair, and cost impact of lost production. Libraries for time-adjusted component failure rates and costs are provided to save time and simplify system modeling.

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PTW Arc Flash Evaluation calculates the incident energy and arc flash boundary for each location in a power system. Arc Flash saves time by automatically determining trip times from the protective device settings and arcing fault current values. Incident energy and arc flash boundaries are calculated following the NFPA 70E, IEEE 1584 and NESC standards. Clothing requirements are specified from a user-defined clothing library. Arc clearing times can be automatically reduced based on current-limiting capabilities.

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Updated in 2019 in line with the latest IEEE / NFPA standards (PTW V8.0.3.3 onwards)
Do you need reliable tripping devices to mitigate arc faults?
Consider CEE's range of protection relays with built-in arc detection.
Designed to enhance the functionality of CAPTOR, the PTW Auto Coordination and Evaluation module is designed to instantly identify coordination and protection issues by evaluating each equipment for adherence to basic coordination and protection rules established by the US National Electric Code (NEC) and recommended industry standard practices. 
The software is designed to evaluate the entire system and identify violating equipment. Quickly view TCC plots to determine the cause of the miscoordination with a single mouse click to efficiently make changes to improve coordination. 
PTW Auto Coordination and Evaluation is a powerful and time saving tool for power system evaluation and operation.
PTW Cable Ampacity module is for accurate calculation of rating and temperature rise in various power cable installations, which is an important part of power system design and analysis. The calculation determines the proper cable sizes to carry specified loads in designing new systems and upgrading power cable installations.

The software examines cable temperature and rating in performing analysis of existing systems. The accuracy of the calculation provides increased confidence in the design, upgrading, and analysis projects.

The Cable Ampacity module is an efficient tool for making complex calculation tasks straightforward and easy.

Click here for more information. 
The Data Exchange Module enables electrical engineers to import SmartPlant Electrical (SPEL) or Autodesk REVIT electrical equipment data and connections into PTW projects conveniently and accurately. Once imported, engineers can then conduct various complex analyses using PTW’s calculation engine. The results are saved in the project database and can be exported back to the originating database. 
This module is invaluable to leverage the power of PTW, SPEL and REVIT software for planning, designing, maintaining and operating a complex electrical distribution system.

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The IEE Wiring Regulations Cable Sizing study module is based on the British Standard BS 7671 "Requirements for Electrical Installations". This standard is the national standard in the United Kingdom for electrical installation and the safety of electrical wiring in domestic, commercial, industrial, and other buildings.

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Cut hours of design work!

Automatically sizes Cables, Transformers, Buses, and Protective Devices to achieve proper size and ratings that meets criteria limits set by the Equipment Evaluation study. This software is best suited for new system designs or to resolve undersized and/or overdutied equipment for existing systems. Includes user-defined Design libraries to specify equipment that is often purchased. 

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Standalone Software Packages
The following software packages are standalone items which do not require the main PTW program to operate.  
Select a program for a brief summary of its function and a link to a full description and downloadable brochure:
PTW Viewer is the perfect tool to provide an interactive electrical model to your customers. Rather than paging through long reports, your customers can display results on the interactive one-line, view time-current curves, print arc flash labels, and many other activities. With the Viewer there is no chance of inadvertent modifications to the power system model.

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Accurate data collection is critical for any successful project. PTW Data Collection is a standalone program for engineers who need to capture equipment data electronically whilst working in the field. Technicians may also use this program to transfer hand written data into the software for more experienced engineers to review and analyse.

Put simply, the Data Collection program can create or update a PTW model but cannot perform studies.  It is similar to the PTW Viewer program except that it allows users to enter new model parameters

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ArcCalc calculates the incident energy and arc flash boundary for any point in a power system. 
Minimum and maximum arcing short circuit currents are calculated using broad tolerances to provide conservative results with estimated system data. ArcCalc saves time by automatically determining trip times from the protective device settings. Incident energy, arc flash boundaries and PPE are calculated following the NFPA 70E and IEEE 1584 standards.

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SKM GroundMat is a program for substation earth grid design and analysis. It is designed to help optimise grid design or reinforce existing grids of any shape. It uses a general-purpose finite element algorithm for potential analysis and graphical facilities to validate ground system efficiency.

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CABLE quickly solves complex three-dimensional cable pulling tension and sidewall pressure calculations, allowing you to make rapid and accurate design decisions. Don't leave installation to chance.

See a three-dimensional graphical representation of your cable route as well as pass / fail notification for each bend

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