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3 phase feeder calculation free download. Electrical.Tools
For 3-wire, 2-phase or 5-wire, 2-phase systems, the maximum unbalanced load shall be the maximum net calculated load between the neutral conductor and any one ungrounded conductor multiplied by percent. When calculating the neutral load, it is not necessary to include loads that do not contribute to the neutral current. Rule 2: Permitted Reduction in Neutral Load – 1. Rule 3: Permitted Reduction in Neutral Load – 2. Where the feeder or service is supplied from a three-wire DC or single-phase AC system; a four-wire, three-phase, three-wire, two-phase system; or a five-wire, two-phase system, it is permissible to apply a demand factor of 70 percent to that portion of the unbalanced load in excess of amperes [ This demand factor is also in addition to any demand factors that may have already been applied.
Rule 4: Prohibited Reduction in Neutral Load – 1. As per Rule 2 above, it is permissible to apply an additional demand factor of 70 percent to a feeder or service neutral supplying household electric ranges.
But, As per Rula 4, applying the 70 percent demand factor is not permissible if the ranges are supplied by a single-phase panel that is fed from a three-phase, four-wire, wye-connected system. Nonlinear Load: A load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage. Rule 5: Prohibited Reduction in Neutral Load – 2. As per Rule 3 above, where the feeder or service-neutral load exceeds amperes, it is permissible to apply an additional demand factor of 70 percent to that portion of the unbalanced load in excess of amperes.
If the neutral load calculated as per Compare the minimum size required for the neutral calculated load with the minimum size equipment-grounding conductor from table The neutral conductor must not be smaller than the required grounded electrode specified in table Email This BlogThis!
No comments:. Newer Post Older Post Home. Subscribe to: Post Comments Atom. Definitions: Neutral Conductor : is The conductor connected to the neutral point of a system that is intended to carry current under normal conditions. Four examples of a neutral point in a system see below image An example of the first system is a three-phase, four-wire wye-connected transformer.
An example of the third system is an ungrounded delta system which is a type of three-phase delta system that is sometimes used in industrial facilities An example of the fourth system is a direct current system used to supply power derived from batteries, power supplies, generators or other sources to the loads. The ampacity rating of a wire determines the amperage that a wire can safely handle. In order to properly size a wire for your application, the ampacity ratings for a wire must be understood.
However, many different external factors such as ambient temperature and conductor insulation play a part in determining the ampacity of a wire. Wire ampacity is calculated in such a way as to not exceed a certain temperature rise at a particular electrical load. The heating of a conductor can be directly attributed from its I 2 R losses in the circuit.
The length of a conductor is directly proportional to its resistance. However, the cross-sectional area of a conductor can also be changed to alter the conductor’s resistance. By increasing the cross-section of the conductor or increasing the size of the wire , the resistance decreases, and the allowable ampacity increases. Good judgement should be used when sizing conductors because large conductors can become costly and difficult to install, while small conductors can cause potential danger.
Use the calculator above to size wire for basic applications, or view some of the wire ampacity charts for wire ampacity values. Voltage drop can become an issue for engineers and electricians when sizing wire for long conductor runs. Voltage drop in a circuit can occur by using a wire gauge that is too small, or the length of the condcutor is too long. For long conductor runs where voltage drop may be an issue, use the Voltage Drop Calculator to determine voltage drop and the Circuit Distance Calculator to determine maximum circuit length.
There are many different types of electric motors ranging from single-phase to three-phase AC motors, low and high voltage DC motors, synchronous and asynchronous motors. When designing a feeder or branch circuit with one or more electric motors, there are several important things to account for. The inrush current of a motor can sometimes reach up to 7 times the full load amps of the motor.
The motor wire size should be designed to handle this in rush current, as well as handle a continuous full-load current of the motor. There are also motor winding protection and thermal considerations to design for when designing motor feeder and branch circuits. This site has many wire size calculators and wire size charts to aide you in properly sizing wire according to code.
Visit the Terms of Use and Privacy Policy for this site. Your feedback is greatly appreciated. Let us know how we can improve. Toggle navigation WireSizeCalculator. Home Calculators Tables. Wire Size Calculator Enter the information below to calculate the appropriate wire size.
Phases: Single-Phase Three-Phase. Conductor: Copper Aluminum.
3 phase feeder calculation free download. Electrical calculation tools
I want to save my time. Jignesh SIr ek din aisa aeyga jab apko crore people like kregi… kyonki ap ap m wo baat h…. Thank you very much for providing such useful personnel and professional information.
Any person can become elect engineer by using your resources. Please accept my heartiest thanks for your extra ordinary effort put on this blog. This is my first Visit to your site but its a blog of ample knowledge regarding, electrical Engineering. Keep it up. With reagrds Sanjay Patidar. Surely,I am one of the electrical personels that will benefit from your wealth of knowledge.
Hello Sir, I must say very useful n informative articles and tools for the ones working in this field. For this I need to prepare the Libraries for various Equipments in the Network.
Recently I am facing Problem in Cable Library. I have used your Excel for the same which help me upto an extent. Dear Sir, Thank you for sharing this superb electrical engineering tool. It is very helpful for us as a young practitioner. Your expertise is highly recommended. Dear sir, kindly says how to provide seeting for protection relays?
Great Work Dear …!!!! Keep it up.. I am Proud to be your Colleague…!!!!!! Dear Sir, i very thankfull to you for the ur web,.. Dear jignesh sir your sit is very useful thank you for it and can you tell me the software to calculate the location of a substation by calculating its load center. Dear Jignesh, I am curious to know the about the LV CB selection requirements for bus tie-in applications between Motor Control Centers, particularly the following scenario.
There is a trip logic controlling these CBs, as the permanent paralleling will be blocked by this logic and one out of the two Incomer CBs will be tripped in case of a permanent paralleling situation. However, whilst closing the bus-tie, Transfomer Neutrals will make a closed loop since there are no breaking of the neutrals on the CBs.
Anybody could tell me is there any international standards for selecting CBs for such applications? Is this scheme technically good? Is there any danger in connecting the neutrals together? Please advise…thanks in advance. How to calculate ground fault current of the equipment,transformer and generator in order to sizing the earth cable for them? You have done a great job and which is very useful for day to day Electrical transactions.
We give great appreciation to you. Dear jignesh, You are god of electrical engineer from india……………….. Dear Sir , I have a question ,suppose we are going to design a LT Panel Main switch board and acdb 3 phase for a control room of substation , so there will be lighting loads , ac , fan , and the Ac supply to the motors in isolator , and the OLTC of the transformer.. Please help me with this any help will be much appreciated. Can you provide the voltage drop calculator for Road Lighting Voltage Drop… i havent find a single voltage drop calculator for specifically street lighting on the web.
Your calculation sheets are very much useful,but i guess it would me more useful for freshers,if u give a demo video on how to use etc. Dear Mr. Jignesh, Thanks a lot.. Iam reading ur blogs its really very interesting and useful for us. I want to do a cable sizing for the DC supply of a SwGr considering all factors like CB closing ckt,tripping ckt,trip relays etc pls advice. Can u please provide excel tool for Maximum Demand calulation for a new project set up This will help is making proper decision on State electricity board contract demnad selection.
Jignesh please contact me as early as possible wants your article to publish in SPE-society of power engineers newsletter for publish in bimonthly newsletter. Many thanks this is the most comprehensive electrical engineering technical notes I have seen so far keep up the good work. Arif Mahdi. DOL only and absolutely no problem with soft starter mode. I reckon it may be high inrush current of vacuum pump high efficiency VSD motor.
Than u sir such a excellent Electrical information is uploaded for us. Earlier I had a communication with U, Pl. Jignesh, what is the difference between the documents of free downloading and the docs we have to pay USD 3. Dear sir, plz provide me NGR related doc. My self jayanta working In Gen set company. Dear sir, i didnot get any download sheets… pls tell me hw to download this calculation sheets… if i click free download, i see a new page and there given 2 options… i clicked first option and download process also going on… bt i didnot get download file… pls tell me sir.
Float Posting Calculation sheet of S. C Level and size of D. G synchronous Panel Today.. I am planning For Electrical space planning. So i have little bit confusion in distances mentioned below. What is distance between two tranformer dry and oil wall space etc.
Hi, This is Jignesh, BUsbar calculation sheet on excel is already ready and will be floated within one month.. Very good work… Keep it up….. Thank you so much. HI dear Jignesh Parmar, I am an electrical engineer from Pakistan and i really found for what i was searching from a long time. Dear Jignesh Parmar, Your knowledge and sharing it is of high praise. Thank You very much. Actually i work in a switchgear company as electrical switchgear design engineer and here only IEC standards are accepted.
Please tell me about this. Very………………very thanks sir provide a use full information. I am also an Electrical Design engineer but I am new in this field. I have read the articles of NEC but I am unable to understand that.
Could you please publish a complete substation sizing calculation with a typical example e. To mitigate this voltage drop it is recommended to use higher size cable. To find the desired cable size pump motor name plate details required i. Thank you very much sir, I love to be an electrical engineer, your work keeps me in heights. Hallo Sir, In Busbar current capacity is considered is in single busbar? Nice job. We are a fan of Excel too. Could you please active that.
The content has a very useful information and would help any serious engineer way to solve quick without struggle. Sirji, Please tell me steps included in lightning arrester design including reference charts and mathematical calculations. Hi Mr. Jignesh, I am interested in few calculations software and I want to buy that would you like to give me some information for the full version that what can i get in full version mean formulas details what will be in full version, your early reply will be appreciated.
Jignesh Parmar, Very nice your Excel programming, In my opinion there is a small mistake in your programming. Also in the new version the error is still there. I try to explain: C. In your calculation the result is 12 in stead of minimum The values of the range locked rotor code A till V is increasing and at the last selection V decreasing. I have changed the mistake and made some cosmetic changes. Where can I send the excel file?
Regards, Happy Harry. I am unable to purchase some of the tools, because it needs credit card and I have debit card only.. Hi jignesh Thank you for the support in sharing knowledge.. Transmission line length is 11km. Respected Sir, Plz help me about some points.
I am working on micro hydro power plant, which is from 15KW to KW in Pakistan, I have some issues If you solve these for me I will be great thankful to you.
In which rout will be suitable for it? In how many distances a transformer can be used and in which Generator can be used a transformer I mean above 75 KW or may be below.? I have 3 transformers each of following below specification. I have consider cable max. DC resistance at 20 degree celcious is correct or i have to take max AC resistance at 90 degree celcious. In old kVA calculation i have to right value of cable from DO fuse to transformer 2 times in HT side otherwise your calculator is not accepting the data.
In new kVA calculation sheet we have bus duct in secondary side of the transformer then how and what value of resistance and reactance to put. This calculator is useful if only one transformer but if we have two transformer in parallel or one transformer and one DG set in parallel then how to calculate. I am having one query. Many time in tender we come across term called solid earthing.
Pl let me know how it is different from normal earthing? Kind regards,. Great fan of yours..!!! In power factor correction , please let me know how the single phase sensing is effective compare to three phase sensing or which is the correct procedure to follow. Can you please elaborate by quoting any example with Calculations as to how the Consumer saves upon his Energy Bills? Jignesh, I would like to buy the 48nos of unlock electrical software.
Jignesh one more information required that after i purchased the 48nos of unlock electrical software. In case if any problems comes like if the software not working properly how can rectify? Jignesh, I would like to buy a Electrical excel tools software unlock version. Could you please tell me that after payment how i will receive the software from you? Awaiting your feedback. Jignesh, Do you have power and distribution transformer design tools software?
Please send me Electrical notes which help of for defind of electrical load with calculation of wire size and mcb. Thanks -Raghavan Siemens. The account that created this link has been terminated due to multiple violations of our Terms of Service. Hi Sir, I am really appreciate to you. I am intresting to buy your Electrical Notes and Excel tools after I had used the lock version.
Because the Excel sheets are very good but some factor are not comply with our local code. I would like to know how can I buy your Excel Tool. I am unable to download or purchase the link of 42 Calculate Bus bar Size for Panel so please check and reply sir. Hi sir, your website is very useful for electrical engineers.
I want zigzag winding calculations could you please attach. Dear sir i hope you are doing well, iam very happy to joint with you thanks alot from your good information, Dear sir i need to ACSR cable calculation if you have time please send me in these khoshhal. On each sheet there is a Free Download and one Paid Download. What is the difference between the two? Dear Sir, I am not able to get free download of No. Please guide. Dear sir I am a working in a solar installation company as a design engineer and I uses your various electrical calculation sheets and now I need different sheet in solar I want to calculate per string voltage drop of DC cable which is from pv module to inverter distance.
As of now, the free version only allows upto 3 nos of busbars per phase. We have taken the secondary output of 11 kV of each transformer to 11 kV panel with 2 input breakers and 1 Buscoupler in between. The polarities are same. I need Type 2 coordination chart along with cable size selection chart. I think you have to mention, what is the difference between free version and unlock version on site.
Why I should spend money for unlock version? It is FREE of cost for downloading or uses but sheets are pass protected, If you want to make any changes or need unlock version of Sheet than you have to buy it at nominal cost indicated on Site.
Or you may want to support developer? Could you please help me out or send me the correct one. Hi Jignesh, what is the difference between the free download version and the unlock version.
What am I getting more from the unlocked version? Really, the information in this site is very useful. Plz Keep continue effort if possible. Paise ke liye to sab kaam karte hai per aap jo kiya o silutable hai. Jignesh Parmar has completed M. Tech Power System Control , B. E Electrical. Membership No:F ,M He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India.
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Remember me on this computer. Enter the email address you signed up with and we’ll email you a reset link. Need an account? Click here to sign up. Download Free PDF. Alfred Waligo Ron Herman C. Gaunt Emmanuel Namanya. Abstract Increasing penetration of distributed or dispersed generation DG is transforming low voltage feeders from passive to active, increasing the complexity of ensuring operating conditions comply with regulatory standards for voltage magnitude.
Related Papers. Reliability constrained unit commitment problem incorporating demand response program. European Transactions on Electrical Power Quantification of economic, environmental and operational benefits due to significant penetration of Microgrids in a typical LV and MV Greek network. Electric Power Systems Research Energy losses in a distribution line with distributed generation based on stochastic power flow. The approach is essentially a voltage magnitude.
The Herman-Beta HB transform meets the growing need for tools that accurately replicate passive transform of the load and generator current PDF to a and active feeder systems with new types of loads and DG. It was developed and implemented The robust analytic-probabilistic calculation already initially on the Microsoft Excel platform and has been adopted as the standard for voltage drop calculations for extended to other software platforms like MATLAB and passive feeders in South Africa and Kenya has been C.
This paper extends the modified algorithms to a new C simple and comprehensive. It contains a graphical user platform, providing a stand-alone open-source program. Thus, the HBA all feeders, including multiple branches and up to nodes. The feeder performance output includes a voltage offers new possibilities for engineers to design and assess profile. Examples illustrate how the program simplifies the performance of LV feeders. The main systems.
Section 3 describes the implementation of an transform, low voltage distribution, voltage profile LV feeder calculation, explaining each data component.