Electrical calculation tools is a set of 7 computer aided online tools designed to help you. Shortcircuit current calculation of effects for the planning and. Shortcircuit analytic sca software performs available fault currents calculations in threephase electric power systems you are working with. Builtin intelligence allows the short circuit program to automatically apply all gost factors and ratios required for high voltage short circuit calculations. Overstressed device alarms are displayed on the oneline diagram and included in short circuit analyzer and study reports.
Voltage drop and short circuit calculations using etap. Fundamentals of calculating short circuit current everything you need to know about calculating fault currents, you learned in circuits 101, trigonometry, and basic math classes. The application of three or four fundamental concepts of circuit analysis will derive the basic nature of short circuit currents. Perform device duty calculations using etaps short circuit analysis software which allows you to determine fault currents and automatically compare these values against manufacturer short circuit current ratings. Calculated shortcircuit behaviour and effects of a duplex. Pdf study on the electromagnetic force affected by short. In addition, a 3phase short circuit can be considered a balanced load, which means you can use a singlephase circuit to analyze one of the phases and the neutral. Calculation tools for low voltage electrical network. The requirements of a short circuit study will depend on the objectives. Hence, the actual figures, if any, will be much better and safer compared to the. Short circuit forces cable cleats cmp products limited. Etap short circuit software calculation complies with gost r 52735 standards, in addition to ansi ieee and iec standards.
Mar 15, 2018 this data enables the calculation of the force between the cable conductors in a shortcircuit situation cable cleats installed to cable containment whether cable tray, ladder or basket are in turn specified at the correct spacing to contain potential shortcircuit forces generated by the lowhigh voltage power cable system. The results of the calculation can be output to an excel table. An equivalent voltage source and impedance at the short circuit location is determined and short circuit current is calculated from them. When short circuit occurs in a point along the transmission line, first the short circuit power at that point is calculated and then the short circuit current is calculated by using a simple formula. Fortunately, short circuit currents are relatively easy to calculate. To calculate the ip if the fixing centres were to be increased 600mm then ft would first need to be calculated. Transmission and distribution electromagnetic forces. The majority of short circuit studies in industrial and commercial power systems address one or. The 1998 equation eq 11 can be reworked into a similar form as the 2008 equation. The proposed algorithm converges very fast and is about 20 times faster than. Cable supported by heavy duty 316 grade stainless steel cable tie. Further further calculations for final result will be done by finite element method.
This method will reduce the effects of vibration due to continuous current but has very little effect on that due to short circuit forces. The result depict that the electromagnetic force due to the transient short circuit from simulation is agreed with the calculation. These values can be calculated on the load side of a transformer, at the end of a run of cable or at the end of a busway. Cmp products cable cleats have been tested and certified in accordance with iec 61914 for the worst case scenario, a three phase short circuit. Calculations can be made from the utility transformer. Short circuit calculations cable cleats cmp products limited. Ft is the maximum force on the cable nm ip is the peak short circuit current ka s is the centre to centre distance between two neighbouring conductors i.
Distribution equipment, such as circuit breakers, fuses, switchgear, and mccs, have interrupting or withstand ratings defined as the maximum rms values of symmetrical current. Verify equipment duty ratings instantly on the oneline. The first step to ensure that system protective devices have the prop. Easy and simple methods for calculating short circuit curr.
Motor short circuit contribution, if significant, may be added at all fault locations throughout the system. The short circuit forces have to be absorbed first by the conductor. Ieee recommended practice for calculating shortcircuit. Voltage drop and short circuit calculations using etap easily in english. The primtech tool shortcircuit current calculation of effects according to iec 608651. What structural engineers should know about substation rigid bus design. The cooper bussmann pointtopoint short circuit calculator is a simple, easytouse program that allows you to calculate prospective short circuit currents with a reasonable degree of accuracy. Comparing both units, the latter transformer can deliver five times as much short circuit current as the former unit. In this video, electrical fault level calculation for short circuit faults is shown. This webinar will present the new short circuit analyzer.
The stresses in the wooden beam are determined from the calculated values of the short circuit forces acting on them. This data enables the calculation of the force between the cable conductors in a short circuit situation cable cleats installed to cable containment whether cable tray, ladder or basket are in turn specified at the correct spacing to contain potential short circuit forces generated by the lowhigh voltage power cable system. Analyzers, plots and reports allow for quick determination of the worstcase fault current device duty. Short circuit current the most commonly occurring short circuit event is a singleline to earth fault in which. Study on the electromagnetic force affected by shortcircuit. Transformer short circuit current calculation and solutions.
Electrodynamic forces in a reminder on short circuit p. These concepts will be stated and utilized in a stepbystep development. Mechanical force on cables ipd industrial products. The forces calculated are short circuit tensile forces, drop forces and additionally occurring pinch forces in conductor bundles, as well as the resulting forces and bending.
The transformer short circuit current is calculated as follows. Hence, the actual figures, if any, will be much better and safer compared to the derived values. The method of images is used to account for the impact of the tank walls. The mechanical forces acting on busbar supports during short circuit are determined both by the magnitudes of the mutual electromagnetic forces exerted among the bus conductors and by the elastic properties of the supporting structure. In this paper, the electromagnetic forces affected by the short circuit current in threephase busbar conductor are calculated in vertical and horizontal arrangement. The discussion begins with a description of the short circuit current, the induced electromagnetic forces and finally methods of preventing transformer failure. Short circuit calculation short circuit software fault. Short circuit calculations short circuit calculations based on iec 60909 vde 0102 it can be applied to all networks radial or meshed up to 550 kv. F force on the current carrying conductor poundsfoot m multiplying factor. Iec shortcircuit short circuit calculation software. The elite software short circuit calculation dos based program is a powerful yet easy to use tool that allows the designer to quickly obtain the maximum potential short circuit current at each node bus in a radial electric power distribution system with up to 2,000 components.
The short circuit forces generated during fault conditions will be governed by a number of factors, and not just by the type of short circuit. An algorithm for fast calculation of short circuit forces. Electrical calculation tools schneider electric global. Themain goal of the short circuit study is to calculate the short circuit currents and voltages at various locations throughout the system. Fc2 mobile app quickly delivers fault current calculations in the palm of your hand. The iec short circuit calculator in the free simaris design software is a real productbased network calculation tool for easy shortcircuit current computation.
An algorithm for fast calculation of short circuit forces in. The programs take into consideration all of the key electrical parameters of power distribution system including power supply, cables, transformers, motors and generators. Breaking strain 1,112n this does not allow for impact strength or safety factor. At the same time, the electromagnetic forces generated will distort the softened conductors which may break free from their supports. In the case of a singlephase short circuit, the forces produced are unidirectional and are therefore more severe than those due to a threephase short circuit, which alternate in direction. Computation of short circuit current at all nodes, or computation of the effect of a fault applied at a given location. Keywordsbusbar, electromagnetic force, short circuit current. Electromagnetic forces are induced in conductors by the currents flowing through them. Or if you have the available fault current, either given to you from utility, or if you are using this program to calculate fault currents at other parts of the system where the aic ampere interrupting capacity is known, input this number and it will automatically override. Short circuit analytic sca software and mobile apps perform available short circuit fault current calculations in threephase electric power systems you are working with. Input the nameplate transformer impedance as a percentage, not a decimal i. Hi everybody i have developed a software to calculate short circuit currents and voltage drops in lowvoltage systems. What structural engineers should know about substation rigid.
Iec short circuit calculator tool with simaris design control. Segment base calculation for sub programs and exact calculation. Force on flat cables outer conductors force on flat cables center conductors enter 2. It is a customary practice for conventional threephase electrical systems to be.
Supply voltage 400v 50hz xc and rc values based on asnz3008. An easy way to calculate prospective short circuit current levels. The forces calculated are shortcircuit tensile forces, drop forces and additionally occurring pinch forces in conductor bundles, as well as the resulting forces and bending. Sample calculation now that we understand the basic variables that determine short circuit currents, lets do a sample calculation. Bussmann series fc2 calculatorfault current calculation. Easypower ansi shortcircuit software delivers intelligent, easytouse tools to.
Any combination of motors, generators, and capacitor banks up to a. Close bundling of multiple conductors, with a spacing between subconductors approximately. Calculate momentary close and latch, interrupting duty and relay currents for. Etap short circuit software makes it easy to go from selecting elements, from the comprehensive library of short circuit current ratings, to performing dozens of different types of short circuit analysis. Usually, the short circuit stresses decide their dimensions. Its a fast, comfortable and very easy to use, menu based software and i thought to ask is there any interest. Short circuit calculation software free download short. A software program is developed to find the worst conditions at which a maximum short circuit electromagnetic force occurs.
Cable sizing to withstand shortcircuit current youtube. Short circuit current calculation at various point of electrical circuits. Comply with ansi, nfpa 70e, nema, and nec standards and regulations. Fundamentals of calculating shortcircuit current everything you need to know about calculating fault currents, you learned in circuits 101, trigonometry, and basic math classes. The amount of data required will also depend on the extent and the nature of the study.
A novel analytical solution for electromagnetic force of busbars is presented. May 12, 2015 a short circuit causes very extreme stresses in a cable which are proportional to the square of the current. Introduction to short circuit analysis course content a short circuit is a lowresistance connection established by accident or intention between two points in an electric circuit. For practical situations, the short circuit force is three times greater than previous standard. Easypower iec shortcircuit delivers effortless, razorsharp tools to. Aframe, electromagnetic force, fem, hv substation, mechanical stress, shortcircuit, tubular. Pdf calculation of maximum short circuit electromagnetic forces. A temperature rise in the conducting components such as conductor, screen, metal sheath. Calculation of short circuit currents summary 1 introduction p. What structural engineers should know about substation. Short circuit calculations below is an explanation of how cmp products calculates peak ka current short circuit current ratings for each specific customer application and installation. These values can be calculated on the load side of a transformer, at the end of a run of cable or. Iec shortcircuit software short circuit calculations made easy. In the following calculations, weight age has not been given to this aspect.
This excessive electric current potentially causes circuit damage, overheating, magnetic stress, arcing, fire or explosion. A new algorithm for the calculation of short circuit forces in busbars of eaf transformers is proposed. Short circuit current calculation at various point of electrical. S space between centerlines of conductors inches note. This full function short circuit calculation program will help you comply with the national electrical code. The bussmann series pointtopoint short circuit current calculator is a simple, easytouse program that allows you to calculate prospective short circuit currents with a reasonable degree of accuracy. This timesaving feature compares and filters various short circuit reports in a single display. It will increase the stresses due to a short circuit current. Short circuit analysis short circuit software etap. Analyzing rigid bus system using fea software by checking insulator strengths bus stress and deflection. The electromagnetic forces exerted between two currentcarrying conductors is a function of the current, its decrement rate, the shape and arrangement of conductors, and the. Ieee recommended practice for calculating short circuit currents in industrial and commercial power systems chapter 1 introduction 1. Pdf engineering method for calculation of shortcircuit. Short circuit analysis uses the pointtopoint method to calculate fault currents at various points in an electrical system up to 600v.
Short circuit current calculation at various point of. This is basically a combination of the steps in the perunit calculation method. The primtech tool short circuit current calculation of effects according to iec 608651. Display the timecurrent curves of 1 to 8 circuit breakers.
Iv been using it for a years now and developing it continually. A practical estimate of motor short circuit contribution is to multiply the total motor current in amps by 4. Short circuit calculation, free short circuit calculation software downloads. Cmp products has carried out over 300 short circuit tests, however it is not viable to test for every fault current, cable cleat, cable sizetype and fixing. Find out how cmp calculates peak ka current short circuit current ratings for each. Jan 05, 2015 this webinar will present the new short circuit analyzer. These values can be calculated on the load side of a transformer, at the end of a. Or if you have the available fault current, either given to you from utility, or if you are using this program to calculate fault currents at other parts of the system where the aic ampere interrupting capacity is known, input this number and it will automatically override the. Formulas for calculating shortcircuit forces between. Transformer short circuit fault current calculator jcalc. This causes various problems related to substation layout and insulator hardware selection. The conventional short circuit calculation is a robust calculation algorithm that does not follow any particular standard. These values can be calculated on the load side of a transformer, at the end of a run. Library analyzing of transformer is a very powerful and flexible tool for refining and doing more calculation for.
After seeing this video, concept of fault level calculation for given single line diagram will be cleared. Normally in most busbar systems the forces are very small and can be neglected, but under short circuit conditions, they become large and must be taken into account together with the conductor material fibre stresses when designing the conductor insulator and its associated supports to ensure adequate safety factors the factors to be taken into account may be summarised as. Short circuit current calculations cooper industries. The forces calculated are shortcircuit tensile forces, drop forces and additionally occurring pinch. Method 1 substation with a single transformer when the plant foresees installation of an. Software automatically create segments corresponding to windings for exact calculation in short circuit forces, eddy losses of windings, etc. Makes pointtopoint fault current calculations easy. Ansi shortcircuit short circuit calculation software. Figure 1 illustrates a simple singleline diagram that very well could be your basic service entrance for a commercial or industrial installation. Transmission and distribution electromagnetic forces in.
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