Bachelor of Engineering in Electrical & Electronics engineering, from Manipal University, (Karnataka), India in 2006. Presently involved in the design of EHV outdoor substation and coal fired thermal power plants for more than seven years. Electrical power cable engineering, edited by William A Thue, Publishers: MARCELD EKKER INC. NEW YORK 2. Resistivity is concerted into resistance by following formula: Where: ρ = Resistivity at 20 C L= 1 kM length A = Cross sectional area of conductor. Tell us what you're thinking... we care about your opinion! Nanotec #308 Power Cable and #777 Speaker Cables . Multiplying factor of √3 is to be taken for 3 phase system. The flux linking the conductor current in one conductor is distorted by the current in a nearby conductor which in turn causes a distortion of the cross-sectional current distribution. Also please note that for perfectly balanced load connected between line1 and neutral and line 2 and neutral of single phase 3 wire system this is true as there will not be any current through neutral. Many consultants recommend the use of above formula for exact calculation of voltage drop in cables meant for power plants. It is a requirement that the voltage at the equipment is greater than the lowest operating voltage specified for the equipment in the relevant equipment standard. A course that pays attention, detail and focuses on designing components of medium voltage power cables, as it makes you fully aware of knowledge of how to choose and use power cables in installations and how to know the technical specifications used internationally.In addition to that learn using tables of manufacturers at work. By this, we mean that they are most strongly influenced by what is connected very close to them in the circuit, such as the electrical power cables. L = length of cable = 150 Mtr N = Number of parallel runs of cable = 1. For 3 phases 4 wire system please do not consider it as three different single phase circuit the 3 phase line to line voltage drop will remain same. Even though all the electrical equipments are rated for negative tolerance of 10% in voltage, and system voltage variation allowed is also 10% on negative side than why do we design the cable from source to load for a voltage drop of 5% maximum, what is wrong if the cable is also designed for voltage drop of 10%? Same can also be done by motor starting studies. As its name implies, BLE is intended for such energy-constrained applications as a sensor or a disposable device. Where: XL = Ohms per 1000 feet S = Distance from the center of the cable conductor to the center of the neutral r = Radius of the center conductor S and r must be expressed in the same unit, such as inches. Dear Mr TK, Your basic doubt is about conversion factors given after table 3-12 of IEEE red book and after table 27 of IEEE grey book. I currently use three of his design along with three Zu Audio (2 - Birth and 1 - … My passion about Sales and Internet Marketing started early in 2015 when I launched my first online store after taking my B.Sc. 73 sold. Learn about power engineering and HV/MV/LV substations. The inductance of an electrical circuit consisting of parallel conductors, such as a single-phase concentric neutral cable may be calculated from the following equation: XL = 2π f (0.1404 log S/r + 0.153) x 10-3. However the formula mentioned in equation number -6 can be approximated as formula given in equation-7, if the vertical component of voltage drop. This power cable comes loaded with premium parts so you can have the ultimate maximum power on demand. Single phase system is of two types: Single phase two wire (which is derived from 3 phase 4 wire system) this system is widely used everywhere. Bluetooth Low Energy (Bluetooth LE, colloquially BLE, formerly marketed as Bluetooth Smart) is a wireless personal area network technology designed and marketed by the Bluetooth Special Interest Group (Bluetooth SIG) aimed at novel applications in the healthcare, fitness, beacons, security, and home entertainment industries. In this system the secondary winding of the supply transformer is center tapped and earthed, providing the neutral, while opposite ends of the secondary winding provide the two line conductors. However one can definitely check for any cable size and length, what value is obtained in terms of percentage? It’s not an easy task to put your expirience in words and pictures. However, the Exact modified formula I cannot get the same values as you and I cant figure out why. Posted by KanedaK (A ) on May 25, 2019 at 01:31:35 So, yesterday my cheap-out-of-ebay (audioconnections store from Germany) power strip arrived and last night I quickly proceeded to a little listening session. This cord is 17mm in its diameter, with 3 conductors within and a 10 AWG per conductor. As I told you before, thank you for sharing your expirience. As any motor is capable of starting properly if voltage available at its supply terminal is 85 to 80% of rated voltage, hence the selected cable size of single run of 3CX300 Sq mm Aluminum, XLPE insulated conductor is sufficient in all conditions of running and starting for motor rated at 160kW supplied by 415V and situated at 150Mtrs from the load center. The power sourcing device compliant to these standards deliver the power of 15 watts and 30 watts. So before starting with calculation for voltage drop let us first analyze that what is the permissible voltage drop as per relevant standards and guidelines and what is the possible logic behind selecting these values as the permissible values. I wonder if you could double check the exact formula to make sure it is right. Now, in technical articles part-2 and part-1 we had considered the sizing of cable for DOL motor feeder rated at 160kW supplied by 415V. ... We Design Custom Stereo Systems. The net driving emf at the center element is thus reduced with consequent reduction of current density. The high gauge size, high purity copper LIVE and NEUTRAL power conductors of THE FIERY are wound in a balanced power design. Now there is two more conversion factor given in IEEE which looks to be your concern. BJC Series-1 and Series-FE HDMI Cables: Different by Design As a general rule, HDMI cables are nearly identical to one another in their internal structure. Later the IEEE 802.3.bt developed two new standards for higher power delivery. It is prudent to make certain that the designed voltage drop does not exceed 5% to avoid problems after installation. Please note that IEEE simply means here that line to neutral voltage drop for three phase system or per phase voltage drop in three phase system has to be multiplied by 2 (circuit length getting doubled) and by 1.732 for line to line voltage drop. In simple terms the current tends to crowd toward the outer surface. Assuming a drop of 1.5% in the cable for incomer feeder, that is from (source) to load center (PCC) which we have not calculated here for sake of simplicity and space limitation. 0 bids. Now let us come back to the original topic that is voltage drop and its calculation. However as per IEEE-525, Guide for the Design and Installation of Cable Systems in Substations, equation number C.2b of Annexure C recommends the use of following formula: Since cable length is usually expressed in meters so before substituting in above expression proper unit conversion should be done. What are the permissible values of voltage drop in cables for different types of feeder? Now the voltage drop formula which I have derived and also given in IEEE is for three phase system and gives line to line drop. $20.95 to $64.95. Thus, the counter-emf is greater in the center of the element. However I suggest that the other two conversion factors for Single phase, three wire, line to line and single phase, three wires, line to neutral is not of much practical utility for design engineer practicing in Asia or Europe where there is only one single phase domestic supply of 240V. It is much more costly to remove and replace an existing cable or piece of equipment that is under rated versus the cost of equipment and cables designed with a degree of extra size and avoid problems due to inadequate voltage at the load. Indian standard-1255 (second revision). The development of offshore wind farms and oil and gas offshore platforms requires the installation of power, control and monitoring and communications cables between the platforms and the main land. This criterion is applied so that the cross sectional area of the cable is sufficient to keep the voltage drop (due to impedance of cable conductor) within the specified limit so that the equipment which is being supplied power through that cable gets at least the minimum required voltage at its power supply input terminal during starting and running condition both. Server:This is the device that exposes the data it controls or contains, and possibly some other aspects of server behavior that other devices may be able to control. These values are indicated diagrammatically below. Single phase three wires which is mainly used as North American residential supply system. The inductance of a multi-conductor cable mainly depends on the thickness of the insulation over the conductor. So approximating VS-Vdy almost equal to VS the formula in equation-6 will be reduced to formula in equation-7. So voltage between phase and neutral is 240V and this system is basically called single phase two wire. It is the device that accepts incoming commands from a peer device and sends responses, notifications, and indications.For example, a thermom… In closely spaced ac conductors, there is a tendency for the current to shift to the portion of the conductor that is away from the other conductors of that cable. 1. Since we calculate voltage drop in terms of percentage of source voltage, this clause is not very widely used in basic as well as detailed engineering fraternity. It helps you. pl help me in knowing whether voltage drop calculation for 3 ph 3 wire system and 3 ph 4 wire system uses same formulae. Those factors are for: • Single phase, three wire, line to line • Single phase, three wire, line to neutral Before trying to understand this I suggest you to read in totality, table 17 and explanation in grey book and clause 3.1.4 of IEEE red book. Ageing, quality assurance, testing, diagnostics and failures of power cables; Asset management, maintenance and remaining life of power cables; For more information and for registration, please refer to the brochure and the registration form. This power cable comes loaded with premium parts so you can have the ultimate maximum power on demand. The goal of a power cord is to act as a medium for delivering current – and isolating noise. • Voltage drop for 3 phase line to line is= x than as per equation-2 the voltage drop for 3 phase line to neutral will be x/√3 or 0.577 times x hence the conversion factor 0.577 • Voltage drop for 3 phase line to line is= x than as per equation-2 the line to line voltage drop for single phase, 3 wire system will be= 2x/√3 hence the conversion factor 1.15 (for extra 2 please note that circuit length will get doubled, please diagrammatically analyze the circuit for load connected across line in a single phase 3 wire system) • Voltage drop for single phase, 3 wire system line to line is= 2x/√3 than as per equation-3 & 4 the line to neutral voltage drop will be (2x/√3)/2= x/√3 hence the conversion factor 0.577. Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! BLE Design 16mm Hi-End Gold Plated Audiophile Audio Mains Power Cable 3 - 8 Ft Here's your chance to own our gold plated 5N OFC (99.999%) pure Hi-end power cable. A longitudinal element of the conductor near the center is surrounded by more magnetic lines of force than is an element near the rim. I know this is an older thread but I want to throw in more support for BLE Design power cables (available on EBAY - somebody already posted a link in this thread). Thanks for the article it really helped me! for more about my question pl refer IEEE redbook 141 page no 113 or Grey Book 241 page 70-75 these describes the derivation of the formula and multiplying factors and table for voltage drop calcualtion. Study specialized technical articles, papers, and electrical engineering video courses. The classic design for a power supply, and still the dominant one, consists of a transformer, a rectifier, and a filter; many modern supplies add to this a voltage regulator. Well answer to this lies in the fact that there is a rule of thumb that 2 percent of voltage is lost at terminations and other points like cable joints in a circuit between the power source and the load. Power Cable Design. So we get two different formulas for voltage drop from two standards of same code IEEE. What are primary and secondary feeders? Its new extension, Bluetooth Low Energy (BLE) is a hallmark in the Bluetooth 4.0 specification adapted last year. HB Cable Design is a very high end cable and power distribution design company from Germany. “If you have knowledge, let others light their candles with it, so that people who are genuinely interested in helping one another develop new capacities for action; it is about creating timeless learning processes". Contact us Today with your Questions ( 844 ) GOAUDIO - ( 462-8346 Sales! Simple terms the current tends to crowd toward the outer surface seven years time. 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