SinceSKM has been the software of choice of over 45, engineers worldwide. SKM is the leader in power systems analysis and design software for fault calculations, load flow, coordination, arc flash hazards, motor starting, transient stability, reliability, harmonics, grounding, cable pulling, and more.
SKM software has been used in commercial, light and heavy industrial, institutional, utility, and petrochemical sites and facilities worldwide. We pride ourselves on being the best in the industry with top-notch products, unparalleled customer support, and hands-on practical training. 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.
See how our products can help you save time, ensure, compliance, and save lives. Fault analysis, coordination, and Arc Flash are just a few features in our software suite. Our products are backed by a world class technical support staff that is comprised entirely of electrical engineers. SKM is committed to providing unprecedented training quality and hands-on applications to real-world situations. Securely access software downloads, purchase new studies, renew maintenance, and more at the new My SKM portal!
April 7, Read our latest Newsletter! New Auto Design software! Interface with Autodesk Revit! Follow our new Facebook page!If you are the main registered user, an account has been created for you. Click on "Forgot your password? If you do not receive an email from My SKM within 1 minute, this means that your email is not linked to your license.
Please contact the main registered user so that they can create an account for you. Email sales skm. Please do not register for a new account if you are a current SKM user. If you have issues logging into the download area or have any questions or concerns, email us at sales skm. Be sure to include your serial number. This 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 National Electric Code NEC and recommended industry standard practices.
The auto coordination feature will attempt to make the minimum amount of changes to the existing coordination and resolve the violations by changing protective equipment settings or frame sizes.
New settings can be reviewed or reverted back to the original settings. Training more than 5 engineers? Email training skm. The software will automatically create Panel schedules and assign circuits to the Panel. The results are saved in the SKM project and can be exported back to the Revit project.
This is a very useful tool for electrical engineers planning, designing, maintaining and operating a complex electrical distribution system. The diagram shown below illustrates the data flow process. December Auto Design Module. Autodesk Revit - SKM. Starting with PTW Version 8. The new standard comes 16 years after the original edition and add additional parameters and processes to accurately assess Arc Flash hazards.
VCBB — Vertical electrodes terminated in a barrier inside a metal box enclosure. HCB — Horizontal electrodes inside a metal box enclosure. VOA — Vertical electrodes in open air.
HOA — Horizontal electrodes in open air. Typical dimensions are selected based on the bus voltage and equipment type.
See Table 7 of the standard for typical enclosure sizes. Auto Design Module! Automatically sizes Cables, Transformers, Buses, and Protective Devices to achieve proper size and ratings that meets criteria limits set by the Equipment Evaluation study. Includes user-defined Design libraries to specify equipment that is often purchased.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.
With DAPPER, users can calculate the voltage drop on each feeder and transformer branch, voltage on each bus, projected power flow, and losses in the power system. This program may be used for conventional voltage drop analysis, loss analysis, power factor studies, capacitor placement, long-line charging effects, impact loading for motor starting studies, generator sizing, and for cogeneration analysis. The DAPPER Comprehensive Fault Analysis program provides a network solution of three-phase, single-line to ground, line-to line, and double line to ground fault currents; RMS momentary fault currents; asymmetrical fault duties at three, five, and eight cycles; the positive, negative, and zero sequence impedance values between each fault location, and contributions from utilities, generators, and motors.
DAPPER will size feeder cables, ground wires, raceways, bus ducts, duct banks and transformers throughout the power system to the load requirements calculated by the Demand Load Analysis program. Feeders are selected to meet user-defined criteria for conductor material, voltage level, insulation type, and environmental conditions. Transformer primary and secondary feeders are sized to the transformer full load as specified by the user.
Feeders and transformers may be included, excluded or evaluated in the sizing study. Input is simplified through the use of libraries and copy and paste functions. The schedules can be displayed, printed, and exported in a variety of different formats. Chosen by the top 40 Electrical Engineering Firms in the world. Benefits: 1. Generate better designs by comparing alternatives quickly. Save time by sharing a common project database and interface. Improve consistency with standard design libraries.
Design safer systems by comparing calculations with short circuit and continuous ratings. Communicate designs effectively with presentation quality graphics, reports, and equipment schedules.
Features: Models radial, loop, and multiple independent systems. Models utility and generator equivalent impedance calculated from short circuit duty.
Models up to regulated and unregulated co-generators. User definable per unit driving voltage at each utility and swing bus generator.
Models transformer primary and secondary taps and off nominal rated voltages. Full transmission line modeling with built in line parameter calculators. Models any combination of constant kVA, constant impedance and constant current loads.
Reports bus voltage, voltage angle, and voltage drop at each bus. User definable report criteria for bus and branch voltage drops. Percentage voltage drops based on system voltage per ANSI standards. Double precision calculations improve solution accuracy. Rapid solution convergence.New PTW software features accelerated tasks, enhanced reporting, increased equipment libraries, improved workflow, addition of new study options and more to meet challenging industry demands.
Back To. The SKM Suite includes the following tools:. CAPTOR produces time versus current coordination drawings with one-line diagrams and setting reports. It lets you coordinate protective devices with interactive on-screen graphics, and provides a comprehensive library.
You can print on preprinted graph paper or on plain paper with custom grids and layouts. 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 of application frequency. The most comprehensive library containing protective devices from all of the popular equipment manufacturers is included.
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.
Clothing requirements are specified from a user-defined clothing library. Clearing times can be automatically reduced based on current-limiting capabilities. 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. It offers separate solutions for low, medium and high voltage systems and for symmetrical, momentary and interrupting calculations as defined in the standards.
Both ac and dc decrement curves required by the total current rated standard C 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 calculation methods are intended for use on unmeshed three-phase a. 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. Equipment that fails the evaluation are reported in table form and color-coded by the one-line diagrams.
The Transient Motor Starting Analysis module TMS is a state-of-the-art time simulation program to analyze all aspects of motor starting problems accurately. TMS models up to 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 modeled 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 setpoints, and all other network parameters.
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.
Existing power systems may be studied and corrective filter designs evaluated before they are installed. Every bus and branch in the power system may be quickly evaluated for harmonic content and for resonant impedance characteristics. 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.
Reports also include three-phase and single-phase panel schedules.Log In. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action. Click Here to join Eng-Tips and talk with other members! Already a Member? Join your peers on the Internet's largest technical engineering professional community. It's easy to join and it's free. Register now while it's still free! Already a member?
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Thread starter dabatman Start date Apr 5, Status Not open for further replies. I think this has been discussed before but I can't locate the thread to answer my question so I thought I would post this. Essentially I have a power supply that can run off V-1ph.
My load is Watts. I agree this is what you should see if you measure with an amp clamp on the conductor on say the A phase at the load.
My question comes from when you actually figure a panel schedule. I have 10 of these in a system and so looking at choosing a service, I believe with I've seen before that actual load on the system is calculated differently. From above, you actually have So do I end up with Watts but VA in the panel schedule? I usually would show VA on my panel schedule but this problem has me a little bit confused on what the correct answer actually is.
I would also welcome anybody's suggestion on an actual text that would show this calculation to see it more in depth. Hameedulla-Ekhlas Senior Member.
Location AFG. Location Seattle, WA. Presuming that the overall power source is a three phase system, here is your mistake: dabatman said:.
Hameedulla-Ekhlas said:. Switch to V Switch to V What I meant to show was that if you balance the loads across the phases evenly then you end up with If you calculate the watts based on that, then it ends up being Back-calculating if you will.
I may be wrong but that's what I'm asking the question for. Last edited: Apr 5, Understanding and Using the "Maintenance Mode Function for Main Device" Option Arc flash incident energy mitigation is an important part of an arc flash hazard analysis. The high incident energies identified at these locations, could be mitigated using many methods and technologies.
The preferred method is to change the settings of existing circuit breakers so the arcing current will be cleared faster without any costly changes. But these setting changes could - and normally do - upset the coordination of the system making it more susceptible to partial or total blackouts.
The ARMS device is normally a specialized circuit breaker with two independent functions. In the phase normal function, the settings of the ARMS device are chosen for protection and coordination of the electrical system during normal operations. In the ARMS maintenance function, the settings of the ARMS device are chosen to have a very fast response no intentional delay to the expected arcing current not the available short circuit current.
This fast response substantially diminishes the trip time and therefore the incident energy at the protected equipment. The drawback for this gain in safety is the loss of coordination while the ARMS function is active. It is important that the ARMS device should be located one level upstream from the equipment to be protected. For example, if the equipment to be protected is a power panel with or without a main overcurrent protection devicethe ARMS device should be installed in the upstream feeder panel.
It is not recommended to install the ARMS device as the main overcurrent protection device at the protected power panel. See Figure 1. If the ARMS device is installed as the main overcurrent protection device, the load-side incident energy will be substantially reduced, but the more dangerous line-side AFIE will not be affected. In contrast, when the ARMS circuit breaker is installed in a separate enclosure, upstream from the equipment to be protected, the line-side and load-side incident energies are reduced.
The scope of this article does not cover how to add this new function.
We assume in this paper that the ARMS function already exists. Since the ARMS device has two functions each with its own settingsthe Arc Flash module in SKM needs to know which of the two functions is active before running the study.
To do so, you have two options. This opens the Protection Functions screen. Then click on the OK button. This will take you back to the Component Editor subview. See sequence of Figure 2A and Figure 2B. Note that from this moment on, all arc flash calculations will be based on the ARMS function settings. If you want to calculate the incident energy using the normal phase function settings, it will be necessary to revert his procedure.
This is a tedious process. When this option is activated in the Arc Flash — Study Options Report Options tab screen, the arc flash study will use the maintenance function settings if the checkbox Maintenance Mode in the Protection Function screen is checked for the ARMS device.
See Figure 3. If you want to calculate the incident energies without the ARMS maintenance function settings active i. This procedure is much simpler than going to the Component Editor of the overcurrent protection device, then to the Protection Function screen and finally unchecking the Used in Arc Flash checkbox for the ARMS function and checking the Used in Arc Flash checkbox for the Phase function.