Calculation of nominal cross sectional area of the high voltage cable high voltage cable. Examples of non critical circuit are general lighting, windlasses, bait pumps, general appliances. Fault level withstand is calculated and cable size increased if necessary tip. This usually occurs when you have three or more individual conductors lying side by side in a single plane. How to calculate lt cable size and voltage drop in electrical. 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 mvhv system cable short circuit capacity is an importantdeciding factor. However the general principles underlying any cable sizing calculation do not change. Cable size calculations calculations based on motor horse power hp and specified current. Cables covers all electric cables up to 245 kv, communications cables copper and optical fiber in addition to a wide variety of special cables manufactured on customer request. Gridcablemax hv cable sizing software made for engineers. Calculate voltage drop and size of electrical cable for following data. Isbn 9780738155296 stdpd95629 no part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior. Based on feedback from our users, now is the time to expand and develop the calculation further. Cable size calculation for 350 kw ht motor in case of lv system cable can be selected on the basis of its current carrying capacity and voltage drop but in case of mvhv system cable short circuit capacity is an importantdeciding factor.
Feb 08, 2014 calculate cable size and voltage drop. Cablesizer cable sizing calculations to iec and nec standards. Excel containment sizing calculator excel networking. Where a cable is totally surrounded by thermal insulation for a distance greater than 0. How to calculate cable size based on ampere or load current 12. The purpose of this document is lay to down the guidelines and design procedure for performing the lv cable size and voltage drop calculation. These spreadsheets below will make your job much more easier, alowing you to shorten the time used for endless calculations of cables, voltage drop, various selections of circuit breakers, capacitors, cable size and so on. K factor taking account of the resistivity, temperature coefficient, heat capacity of the conductor material, initial and final temperature. Operating current a, 125% current per nec a, zero length cable size, acceptable voltage drop v, actual. The cross sectional area of high voltage cable where calculated shall not be less the value determined by following formula. As you pull the conductors through a bend, the curvature of the. Other companies produce their own software tools some free, some you need to pay for. How to calculate ht xlpe cable for 11 kv 433 v, how to calculate ht xlpe cable for 11 kv 433 v, 1500 kva oil type transformer system.
The heat output of vsx ht cable varies in response to the surrounding temperature by reducing its thermal output. Amps aluminums conductor copper conductor aluminums copper ground duct. The group is a global player in the infrastructure, industry, building and local. How to calculate voltage drop and size of electrical cable 6. Information center tools applications catalogues library medium voltage. Generally ht cable sizing is not done based on the full load current of the equipment but based on the prospective fault level. Allentown, pa abstract more and more substations are retrofitted with numerical relays, meters and monitoring devices. Power cable installation guide figure f5 multiple sheaves figure f6 sheave arrangements for feeding into cable tray training radius the training radius is the final positioning of cable ends after the cable has been placed in the raceway.
Sizing calculation of cable for short circuit, voltage drop, ampacity 8. Sep 12, 2017 cable sizing is done based on three parameters. Formula used is, cable size fault currentin kafault clearing timek. Next, find the cable size for the short circuit capacity of the system. Now, we can consider these four points one by one and choose a cable which complies all these requirements. Cable sizing calculationhow to select cable sizeelectrical. The required cable size is the largest size from shortcircuit, overload, and shock requirements. Electrical tools ms excel spreadsheets this section is dedicated to tools every electrical engineer can use in daily work.
For example if you are calculating the size of cable for a 1 kw single phase pump. Calculation to perform electrical cable sizing as per iec 60364552. High voltage xlpe cable systems techincal user guide brugg cables page 2. Dc amps locate the current flow in amps of your circuit along the top of the chart below. It considers current rating, voltage drop and short circuit current. This article examines the sizing of electrical cables i. Fictitious calculation method for determination of dimensions. Electrical load of 80kw, distance between source and load is 200 meter, system voltage 415v three phase, power factor is 0.
Voltage drop is calculated and cable size increased if necessary 3. Gridcablemax is a user friendly program that determines cable ratings with total accuracy. How do we calculate the size of three phase cables from kw. A range of reliable, safe and non hazardous ht power cables ideal for carrying current at high voltage, the ht cable range from havells are manufactured at the largest integrated cable unit in india and use high quality copper and aluminium conductors. I need the quotation of, your name is, your email is, your phone number is, message. Seriously, depending on the application this could be very dangerous. How to calculate ht xlpe cable for 11 kv 433 v, 1500 kva. Home information center tools applications medium voltage calculation. For ht side cable 16 sqmm xlpe cable is required,but i dint think wolvarine need this cable because he is asking for trafo to lt panel only. An example how to calculate voltage drop and size of electrical cable photo credit. No signups or logins required, just click below to start sizing to either nec or iec standards. Next comes the short circuit current of the system, for a 240 volts single phase system, design short circuit is 6ka, for 11kv it is up to 25 ka and 33 kv it is up to 70 ka. Cable size calculations electrical engineering portal. In case of lv system cable can be selected on the basis of its current carrying capacity and voltage drop but in case of mvhv system cable short circuit capacity.
The development of high voltage xlpe cable systems goes back to the since then production and material technology have improved significantly, providing reliable and maintenancefree products to the utility industry. Technical specification for 112233 kv nominal voltage ht xlpe power cables 1. So in case of ht motor, the cable short circuit capacity alone is enough to determine the cable size as rest two parameters will automatically follow. How to calculate size of a cable for 11kv or 33kv line zxpress. Cablesizer is an automated cable sizing and design calculation tool to iec and nec standards. Technical topic student minimising voltage differences short. Using a volt drop formula to calculate the correct cable size for a marine electrical installation. Cable solutions to ensure the reliability of your energy network with energy as the basis of its development, nexans, the worldwide leader in the cable industry, offers an extensive range of cables and cabling systems.
Cable or conductor sizing is the process of selecting appropriate sizes for electrical power cable conductors. Power cable installation guide cables installed into conduits or trays have installation parameters such as maximum pulling tensions, sidewall pressure, clearance, and jamming, which must be considered. Ieee guide for the design and installation of cable systems. Cables are sized based on ampacity considerations, voltage drop considerations and short circuit considerations. When sizing your raceway system, you should always consider the possibility of cables jamming or wedging. Apr 24, 2011 dear jignesh, your cable selection table is very helpful. Load the load of circuit is available in kw or watts. Cable sizing software cable sizing calculation etap. Our cable sizing calculation has been here for some time. An example how to calculate voltage drop and size of. How to calculate ht xlpe cable for 11 kv 433 v, 1500 kva oil type transformer system.
Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. At present, numerous high voltage xlpe cable systems with nominal voltages up to 500 kv and. Generally ht cable sizing is not done based on the full load current of. Ieee guide for the design and installation of cable systems in substations. Other installations, such as buried and aerial, have different installation parameters.
Load current, short circuit current carrying capacity, voltage drop. See also cable sizing calculators for nec, iec 60364 and hd 60364 standards. The following conditions have been assumed to calculate the current ratings. How to calculate cable size for motor, cable size for load, cable size for 3 phase motor. Cablesizer cable sizing calculations to iec and nec. High quality cables, continuous developments of the production range, direct and fast shipments have contributed in rendering liban cables an important. Below are given simple steps for performing cable sizing calculations. Cable size and voltage drop calculation for lt lv low tensionlow voltage pu r pose. Calculate cable size and voltage drop electrical notes. High performance vsx ht selfregulating heating cables are designed specifically for process temperature maintenance or freeze protection applications where high maintain temperatures or high temperature exposures are required. To know how to calculate the voltage drop in a cable you can read our blog how to create cable schedule for a project.
The cookies settings on this website are set to allow all cookies to give you the very best experience. Calculation of nominal cross sectional area of the high voltage cable. Along with the cable sizing calculation results, this section also displays the required cable sized, cable ampacity, percent of voltage drop, and percent of starting voltage if cable sizing options for the corresponding requirements are checked. Home technical articles sizing calculations for 203. Calculating the right size there are five steps to calculating the right size of cable for a particular load. Ieee guide for the design and installation of cable systems in substations sponsor substations committee of the. In case of lv system cable can be selected on the basis of its current carrying capacity and voltage drop but in case of mvhv system cable short circuit capacity is an importantdeciding factor. How to calculate size of a cable for 11kv or 33kv line. Correct cable size select the correct circuit type. Cable sizing methods do differ across international standards e.
The cable sizing calculator calculates the required cable size according to asnzs 3008 australia and new zealand standard. Fault level withstand is calculated and cable size increased if necessary. Calculating correction factor of cable from following data. High voltage xlpe cable systems technical user guide. At myelectrical we have put together a series of free software tools to assist our users in carrying out their work. Calculating wire cable size formula for three phase circuits. Bs 7671, iee wiring regulations cable size is selected as follows. How to calculate ht xlpe cable for 11 kv 433 v, 1500. How to calculate ht xlpe cable ct sizing calculation of 11kv systemrev0ver3. Oct 26, 20 this is the general methodology for sizing cables for any electrical systems. These limits should not be used for cables subjected to pulling tensions during installation. The following calculator computes the resistance, inductance, inductive reactance, capacitance, charging current, and surge impedance for medium voltage shielded power cables. When sizing conductors, calculations limits wire size to voltage drop and nec ampacity.
Cable sizes are typically decribed in terms of crosssectional area, american wire gauge awg or kcmil, depending on geographic region. Southwires voltage drop calculator is designed for applications using awg and kcmil sizes only. This calculator provides a good estimate based on industry standard calculation methods and cable manufacturing data. And for lt side cable as per current rating 695a, it should be a 400 sq. If you continue without changing these settings, you consent to this. 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. Iec, nec, bs, etc and some standards emphasise certain things over others. An example how to calculate voltage drop and size of electrical cable.
K90 for al cables, k140 for cu cables step 2 is normally done for ht cables. Ieee guide for the design and installation of cable. Iec xlpe cable systems specified according to iec international electrotechnical commission are among many other standards accepted. I think, calculation of nominal cross sectional area of the high voltage cable. For technical queries with regards to your warranty application please. If the calculated value of voltage drop is greater than the value calculated in step 1 maximum allowable voltage drop, than calculate voltage drop for the next greater in size cable and so on until the calculated value of voltage drop became less than the maximum allowable voltage drop calculated in step 1.
483 76 1428 1315 672 159 745 1347 997 880 634 499 1435 534 601 924 761 1289 775 461 1086 760 1443 320 220 444 1111 1036 1141 1308 402 121