Medium voltage technical guide electrical engineering portal. The option to size based harmonic spectrum is only enabled when bs 7671 17th edition or iec 60364 standards are selected for cable sizing. International electrotechnical commission publication iec 20a, 1978. Optimum sizing of offshore wind farm export cables. These sealing ends are also called terminations or terminals. The standard is applicable to all alternating current voltages and direct current cables up to 5kv.
Most often, the older relay gets replaced with a newer relay with the rest of the installation such as current transformer ct and lead. Multicorecables on racks or trays may be bunched in a maximum of two layers. The reporting function also provides a concise record of the cable size calculation work performed. Cable calculation software mvhv specific iet engineering. High voltage terminal boxes 01 high voltage terminal box. Feb 09, 2018 in case of lv system cable can be selected on the basis of its current carrying capacity and voltage drop but in case of mv hv system cable short circuit capacity is an importantdeciding factor. Dnvglst0359 subsea power cables for wind power plants. Is 7098 p3 or iec 60840 or iec 62067c radial water barrier lead alloy sheath is very. Also, check out our blog for news and discussion on cable sizing. Eland cables is a leading supplier of power cables to british, european and international standards, including iec 60502. Iec 60287 calculation of the continuous current rating of cables 100% load factor is the international standard which defines the procedures and equations to be used in determining the current carry capacity of cable.
The method uses as main input sitedependent time series of wind power generation and seabed temperature, in order to apply dynamic temperature estimation dte analysis using a thermoelectrical equivalent model tee, followed by an estimation of lossoflife fractions in the insulation. Ieee guide for the design and installation of cable systems. Cma power cables paper insulated, lead and aluminium sheathed cables up to 1933kv dated 12287. Control cable for high voltage ss laid in a cable tray in a trench, is it a must to be armored or not, and what does iec said in this issue. Iec 60287 current capacity of cables rated current by steven mcfadyen on february 18th, 20 this note looks at the formulae used to calculate the rated current capacity of a cable in line with iec 60287 calculation of the continuous current rating of cables 100% load factor. This guide is not intended for use in the design of wire and cable systems in generating stations, which is adequately covered in ieee std 4221986 and ieee std 6901984. Ieee guide for the design and installation of cable. Cable sizing methods do differ across international standards e.
Selection and erection of electrical equipment wiring systems is the iec standard governing cable sizing. For example if you are calculating the size of cable for a 1 kw single phase pump. A global solutions provider, prysmian offers a wide range of integrated. Iec 60183 guide to the selection of highvoltage cables iec 60502 power cables with extruded insulation and their accessories for rated voltages from. This calculation also could be used to determine the selection of the cable size for the high voltahge hv cable and the conductor could be copper or aluminium. At brugg cables, professional computer programs are in use for the calculation of the various cable. Cable sizes are typically decribed in terms of crosssectional area, american wire gauge awg or kcmil, depending on geographic region. Ieee std 525 2007 revision of ieee std 5251992incorporates ieee std 5252007cor1. This will help you with the calculations, and they have a cable pulling module although i have not used that particular module. Lt cable sizing cable size calculation pdf cable size calculation wire size ampacity chart mv cable sizing calculation pdf cable size calculation formula pdf. In view of sizing an lvhv electrical installation and the associated cable cleats, accessories and electrical equipment, as well as determining effective protection of both life and. Olex cables high voltage xlpe insulated cables 0882.
Etap also has an iec 60287 thermal calculation module should you need it. Iec 60332 tests on electric and optical fibre cables under fire conditions iec 60502. Introduction this reference is intended to give a basic overview of insulating materials that can be used during high voltage withstand testing, in particular cable testing. A high voltage insulated cable circuit consists of three singlecore cables or one threecore cable with high voltage sealing ends at each end. I use cable hv to calculate the permissible current rating of cables under different installation configurations. Sizing conductors and selecting protection devices legrand. As per iec standards following three classifications exist. Ieee guide for the design and installation of cable systems in substations. Cable or conductor sizing is the process of hv cable sizing scribd. Cablesizer cable sizing calculations to iec and nec standards. Gridcablemax hv cable sizing software made for engineers.
Cablesizer cable sizing calculations to iec and nec. Local and historical factors play a part, and limits are usually between 30 and 100 kv see iev 6010128. Testing and commissioning of extra high voltage cables 110kv consisting of. Technical specifications for ehv 110kv power cables. Hv cable sizing software in compliance with iec temperature rise and cable losses of high voltage power cables under multiple scenarios and installation high voltage cables prysmian group high voltage systems 04 high voltage xlpe cable production since the introduction of polymeric insulation, we have made an important contribution. A methodology for optimum sizing of offshore wind farms high voltage ac export cables is presented. Cable voltage drop should be less than defined voltage drop. Nec nfpa 70 2011 national electricity code is the equivalent standard for iec 60364 in north america and includes a section covering cable sizing in article 300. Iec 60840 or iec 62067 metal wire screen when a layer of copper wire screen is required, it shall be applied over the insulation screening. Now, we can consider these four points one by one and choose a cable which complies all these requirements. All raychem high voltage cable accessories products are subjected to extensive testing from the time they enter our plants as raw material until they leave as finished products. Iec 60502 cable global cables and cable accessories supplier. In accordance with icea, iec, ieee and other power cable consensus standards, testing can be performed by means of direct current, power frequency alternating current, or very low frequency alternating current. Cable sizing software cable sizing calculation etap.
I have tried grid cable max and heard of an autralian project called cable calc pro. Cable sizing calculator iec 60364 and hd 60364 jcalc. Economic optimization of power cable size iec 603001. Then, v is the cable rated voltage between phase conductors, expressed as.
For medium voltage cables, the calculations will be according to iec 60502. For underground cabling, the spacing between cable numbers along the route should not exceed 5 m, and for above ground cabling, 25 m. The calculation of cable rating follow t he derating factor method, see cable derating factors. Raychem high voltage cable accessories up to 245 kv. Catalog high voltage engineered induction motors technical.
One or more layers of suitable separator binder tape may be applied helically over the screen as applicable. V v3 v0 the exact rated voltage selection of power cable depends on earth fault withstand limits and specifications considerations that are made by the power system designers. Hi, i am hoping someone might be able to offer some opinions. The documents are available free of charge in pdf format. Dnvglst0359 edition june 2016 subsea power cables for wind power plants. Cable sizing groundingpe etap cable sizing for groundingpe conductor provides various options which can be used as design requirements. For technical support with your iec standard cable requirements, contact our technical engineers who have vast experience with their designs, manufacture and testing.
The following details are required for calculation. Our software has been designed to calculate the current rating, temperature rise and cable losses of high voltage power cables under multiple scenarios and installation conditions in accordance with iec standard 60287. A high voltage insulated cable circuit consists of three singlecore cables or one threecore cable with high. Cable or conductor sizing is the process of selecting appropriate sizes for electrical power cable conductors. How to calculate size of a cable for 11kv or 33kv line zxpress. Iec xlpe cable systems specified according to iec international electrotechnical commission are among many other standards accepted. There is also complicated software that develops by abb that could be used to determine the fault current and cable size. For the use of this standard, high voltage see iev 601. No signups or logins required, just click below to start sizing to either nec or iec standards. Figure f2 cable feed into conduit at floor level c from cable reel to cable tray, the cable is fed from the top of the reel to maintain required curvature. Iec 60364552 2009 electrical installations in buildings part 552. An example how to calculate voltage drop and size of.
The hv cbale size shall be base on the fault level on hv side. When the length of the circuit exceeds the capacity of a cable reel, joints are used to connect the unit. Prysmian cable cleats prysmian cleats hv 11kv 33kv. Iec 60287 current capacity of cables an introduction by steven mcfadyen on january 31st, 20 iec 60287 calculation of the continuous current rating of cables 100% load factor is the international standard which defines the procedures and equations to be used in determining the current carry capacity of cable. So in case of ht motor, the cable short circuit cap. Now, calculate the current that will be running in the circuit due. How to calculate size of a cable for 11kv or 33kv line. On high voltage circuits the prospective fault current and backup protection time is typically used i. The current carrying capacities shown in the electrical characteristics tables are calculated according to the internationally adopted method of the iec publication 60287 for a maximum core temperature of 90.
Iec, nec, bs, etc and some standards emphasise certain things over. Power cables with extruded insulation and their accessories for rated voltages from 1kv to 30kv iec 60702. Iec 60287 current capacity of cables rated current. These design requirements can be userdefined or automatically determined from short circuit and protective device calculation results. I found it to be an invaluable tool that guides my high voltage cable designs, as it is easy to use and quick to modify a design. Part 1 does not contain any current capacity sizing, as this is intended to be covered by iec 60364. Hv and lv single core cables shall be laid in trefoil groups with 150 mm clear spacing between trefoils. Allentown, pa abstract more and more substations are retrofitted with numerical relays, meters and monitoring devices. I will be carrying out a lot of cable calculations ratings, pulling tensions etc. Abb has always been a pioneer in the high voltage field and we have many. Cenelec guide r064003 gives a rigorous calculation method suitable for calculation software. This document has been developed as a guide for the design, installation, and protection of wire and cable systems in substations with the objective of minimizing cable failures and their consequences. Xlpe cable systems specified according to iec international. Cable high voltage electrotechnik pty ltdelectrical.
Cable short circuit capacity should be higher than system short circuit capacity at that point. Load the load of circuit is available in kw or watts. Testing of hv cables supplementary information page 1 of 24 reference sp0407r02 ver 2 ergon energy corporation limited abn 50 087 646 062 1. Cablesizer is an automated cable sizing and design calculation tool to iec and nec standards. All non electrical type tests as required by iec 60502 routine tests routine tests are carried out on each finished length of cable to control the overall quality of the. Other than that, you could try system analysis software like etap. The cable is fed from the bottom of the reel so that its curvature is continuous with no reversed bends. High voltage xlpe cable systems techincal user guide brugg cables page 6 2. Requalification testing is carried out on a regular basis with installed components.
Cable layout and system design the dimensioning of a high voltage cable system is always based on the specifications and demands of the project at hand. Gridcablemax is a user friendly program that determines cable ratings with total accuracy. Etap cable sizing module considers zero sequence triple harmonic constraints as well as other harmonic constraints based on correction reduction factors for other order of harmonics. Perform a shieldcontinuity test on each power cable. The cable sizing calculator considers current rating, voltage drop and short circuit current according to the iec 60364 and hd 60364 standards. High voltage xlpe cable systems technical user guide. Iec 60287 current capacity of cables an introduction. On trays or racks hv cables shall be segregated from the lv cables. During this phase, it is important to carry out calculations that assist in making the decisions and determine future performance.
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