t could the heating be due to? 0

2021/05/21

What could the heating be due to? 0000052104 00000 n 0000001854 00000 n Maximum current 400 A on 8 ~ 10 V DC. 0000002933 00000 n I'm a new plating learner. Here in the USA and in the electroplating industry, the nice round number of 1000 Amps per square inch for open bus bar was universally accepted long before I entered the industry, and that was over 60 years ago :-) I don't have any knowledge of busbar size calculation; please send me choice of a correct busbar sizes for required current rating. : I have copper bus bar width = 14 mm, thickness= 6 mm, temperature 100 degrees -- so how to calculate current carrying capacity. 0000034399 00000 n 0000001572 00000 n Best Regards But in my own experience, plating shops rarely use plated ends or buss bar clamps: they just drill holes, and wire brush No-Ox-Id compound onto the joint area before bolting together. A. Hi Mike. So basically I will be making up the busbars myself with a whole lot of 3/8 bolts. 0000000776 00000 n 0000023458 00000 n I think the correct answer will be slightly more than 1/10 of a square inch for a peak load for only one second, but I can't say for sure, and feel that the codes probably want you to size things based on maximum-ever loads for safety, not usual loads. Welding cable is often used because it's both flexible and designed to carry substantial currents. endstream endobj 55 0 obj<> endobj 57 0 obj<>/XObject<>/ProcSet[/PDF/Text/ImageC]>>>> endobj 58 0 obj[59 0 R 60 0 R 61 0 R 62 0 R] endobj 59 0 obj<> endobj 60 0 obj<> endobj 61 0 obj<> endobj 62 0 obj<> endobj 63 0 obj<> endobj 64 0 obj<> endobj 65 0 obj<> endobj 66 0 obj<> endobj 67 0 obj<> endobj 68 0 obj<>stream A. Hi TJ. A. Hello again, Petr. 0000008826 00000 n For example: A DC busbar with 38000A current, 200 v dc Thanks again, Kurt.

This gives you measurable but not excessive voltage drops, and warm but not hot bus bars. 0000003864 00000 n Related to the thread, if I intend to use DC cables instead of Copper Bar for connecting rectifiers to the anode and cathode bars, how should I go about deciding what size and kind of cables to buy. Hi, Sujin. Thank you for very useful information; I have question as I work only in AC and I'm managing project for DC busbar with the following data: length 100 m, Current 2000 A, Voltage 48 V, size 1600 mm2. How to calculate copper bus size for the Continuous DC load of 100A & a peak load of 200A for 1 Sec. 3bi50PK k`eiWj. Would appreciate some help. 0000001593 00000 n BBat)[9L(y]1Vu5r7xnGY/ I have been going back and forwards with this for weeks. And V = I x R, so I get: I think that we can see from Ohm's Law that the knife-edge contact is not causing a significant resistance, and we can see (with a thermal scanner if not by hand) that there is no dangerous heat buildup at the knife edge. The bars are run with their long axis vertical. free & open in air. So, how about if Im using trips 10mm wide, 40mm long and 2mm tick? Bus bars are also supposed to be clamped together rather than bolted, I believe. I think you may need to retain an experienced electrician, electrical engineer, or plating consultant -- someone who has worked with this stuff and is familiar with the concepts being discussed. To me, I think it is under size since the current ampacity of it should be around 2600A (in AC, DC should be less). 0000002904 00000 n Q. As you see, we appended your inquiry to a thread which I think will answer it for you: the copper needs 1 inch of cross sectional area for every 1000 amps. I know that the surface corrosion will have a very small impact but that the connections could be significant. To the degree that they suggest that copper can only carry 70 to 87 percent of what we know for a fact that it has safely and reliably carried in tens of thousands of plating and anodizing installations over 5 or more decades, I think it is they who need to go back to the drawing board :-).

I would, however, like to make a suggestion. The ampacities that follow are from Table 5 of Standard T1.311, and are reproduced here solely for the convenience of the viewer. Drew, "No-Ox-Id" Compound That's a lot, and it would apply to each pole if they're both 100 m long. That means I'd go with 100 Amps/sq.in. 54 0 obj <> endobj I want to measure the end resistance and inductance of a bus bar. Z ig[c7y6tl6 Q"*&}w ]BSA!(jB%[3HRe0%>C\~KyIwz[ q54fZ=6a7fv.ES:ElG5v_1*bTc1N1VI5McnlRI36VN46jehA Nn~Od[JnMqQ-cp_XdcJr,Ri}v9l/)fohp:=?H'L}NxT Fp0ZF0T=T&Cnq3~*Bg8Q):NTwO e?=P'Iti`=);F&!x}6~! So you will see that empirical numbers are used instead. It is enough dimension for new copper ? Ampacity rating to be used when the long axis of the bars is in the horizontal plane, or when the spacing between bars is less than the thickness of the bars, or when the bars are run in a vertical direction. V = 2000 A x 1.05 x 10-3 Ω = 2.1 Volts. %%EOF 0000004455 00000 n 0000026542 00000 n Thanks & Regards. 0000001240 00000 n 0 To measure the resistance of a bus bar you can use Ohm's Law. 0000012757 00000 n 0000005512 00000 n You can measure the amperage along the length of the cathode bar on each rack/fixture with a tong tester/ammeter to verify the amperage is consistent.

Save my name, email, and website in this browser for the next time I comment. 0000020523 00000 n 56 0 obj<>stream Q. Hi. Are these results based on peak current capability or sustained current capability? if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'electrical4u_net-banner-1','ezslot_11',126,'0','0'])};if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-electrical4u_net-banner-1-0')}; Very useful information, but confusing one thing It says that to calculate amps need to know only width and thickness (in my case copper strips). My question are: Q. 0000009080 00000 n The resistivity of copper bus bar is about 1.68 x 10-8 ohm-m, so I get as the resistance of your bus bar:

Ceiling Fan Power Consumption Calculation, Power Saving Tips, What is Busbar Current Carrying Capacity Calculation 5 Types of Busbar, AP Electricity Bill Calculator & Rate Per unit Cost 2022, Karnataka Bescom electricity bill calculator & Latest Tariff 2022, DHBVN Electricity Calculator & Per Unit Rate DHBVN, IDMT Tripping Time Calculator, Formula, Calculation, Battery Life Calculator, Formula, Example, Formula, Torque conversion Calculation, Formula, Example, T-Match Impedance Matching Calculation, Formula, Example, Strip line Trace Width Calculation, Formula, Example, Circular Waveguide Calculation, Formula, Example, VSWR Return Loss Calculation, Formula, Example, Trace resistance Calculation, Formula, Example, Tank circuit resonance Calculation, Formula, Example, T-Pad Attenuator Calculation, Formula, Example, Skin Depth Calculator, Calculation With Example, ITI Electrician Whatsapp Group Links Join, 1500+ Active Electrical Engineering WhatsApp Group Links Join, Top 10 Electrical Website for Electrical Engineering Students, Copper bar carries 4500Amps (1.2 x 150 x 25) current, Aluminium Carries 3000 Amps (0.8 x 150 x 25) Current, GI Bus Bar Carries 2250 Amps (0.6*150*25) Current. 0000070357 00000 n Hopefully someone who knows will help us. As R=rho*length/Cross-Sectional Area wouldn't there be a high amount of resistance near the joins due to the area being so small (as the contact is on top resulting in an edge contact, rather than contacting the entire cross-section at the end)? There should be no decline. Huh? During plating the cathode bar gets so hot you cannot touch it. www.stormcopper.com/design/Buss-Bar-Ampacities.htm. The spacing between bars is equal to or more than their thickness, and the bars are run in a horizontal plane. 1/4" x 3" bus bar is rated 750 Amps, not 1500 Amps, based on 1000 A/sq.in. There should be no spot on the switch where the cross sectional area of the copper is less than 1/5 in2 because the current carrying capacity of copper is 1000 A/in2. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful. 0000012868 00000 n Q. If you are leading each end of your cathode/anode bars from the MAIN busbar, I found that these leads from the MAIN busing should be of the same length. Thanks! For example, For 1500 Amps Which size Copper Bars I have to use Terminal box i.e. The minimum bending radius for copper is equal to the thickness of the bar. 0000012813 00000 n plating on plastics - New Delhi, India. 0000002007 00000 n In other words, how large does the cross section of the steel fixture have to be in to facilitate proper current flow or at least so that it does not overheat and fail mechanically. Will connecting both ends of the cathode bar decrease the resistance through the cathode bar to the 40 plating racks evenly spaced on the bar? xref I have a rectifier it gives output 24 volts DC and 15000 amps at source to load in distance 6 m, 5 m, 2 m, 1 m. At what size of busbar(or) cables are taken my application and what type of insulation I prefer to the bus bus at safe conditions. Now I have a rectifier which the rating the output rating is 12VDC, 4000A. But please keep the discussion moving forward by trying your very best to phrase ongoing questions in terms of the answers that have already been offered. Please get tables from suppliers like stormcopper or consult the National Electrical Code. 3) Will the size be different for DC and AC 50 Hz? Sunny. I have never claimed to be an electrical engineer, but have run a lot of wire in my day. I think that page should be fine for AC current calculations. xb```b``vc`e` |@QYAUVMom;xvPZk'm\2k`` AE+20EXN[AyR~`?e?k1@U ' Copyright 2022 Copper Development Association Inc. All Rights Reserved. I have a question for you: what's the whole voltage drop, cross section and short circuit current computing procedure of a DC busbar? Parts are hung in the tank using steel fixtures with copper strips to aid the current flow as far as it is possible. Sorry that it's hard to be of much more help from such a distance.

Length here absolutely doesnt make any difference when comes to calculations? ; J My own thumb rule, which was already a well established guideline at the plating equipment manufacturer I went to work for in 1967 is simply 1 square inch (645 square millimeters) of cross sectional area in the bus bars for every thousand amps you want to carry. 30E&J@1"+O'+=J

Aren't the connections coming out of the rectifier implying that four or five 6 x 100 mm bars are suggested? No abstract questions. Fits your number perfectly. Enter the breadth and thickness of the busbar; do not enter the length of the busbar. Affiliate Link when submerged, even if the particular steel were a little lower in conductivity. If these charts indicated higher ampacity than the simple old-fashioned method, I'd want to go along with them. DC causes greater heating of the bus. Bus bar connections are actually supposed to be silvered or tinned. Q. Hi to all, I want to know all types of Copper bars Current calculations. I feel you can proceed with what you have. Also do you have an example of how long peak would be measured using your calculations? <]>>

Good question. I will appreciate any help you can provide. I need to reinstall some bus-bars in our factory. Obviously, this is a suggestion only applicable to submerged plating jigs, and not to be extrapolated that it's okay to figure steel as 10 percent of copper in all applications :-). Are you sure the copper is all hard drawn electrolytically pure? 0000005266 00000 n

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But whether you should proceed or start over may be a different question, and I suspect that most people would advise you to just continue :-). Our maintenance people make the fixtures, but sometimes they are not sized properly so they overheat and parts end up at the bottom of the tank. And I understand that a 1/4 x 4 bar has greater surface area and cooling, and consequently higher current carrying capacity, than a 1/2 by 2 bar. In same current, copper which apply to DC circuit should be larger than AC 50Hz circuit? How to calculate the copper busbar size for a given DC current rating ? @ |Kj ;!EGK#&0l"W^Ui0o?wYlnd)Ffvk3mm3;0UE$00b-+fBf[ mKnw'k1Ke/e{SE(Y9k>.VE/xqEaBIM}y7:7"{88Q(Q.PrC(!y$-?^DR Sorry, I don't know the codes regarding short circuit protection (if any) in your situation, and my main experience is with low voltage busbar, not 200 V busbar. But figure it is about 10 percent of copper. Q. Hello, I need to know the calculation for DC bus bars Size for Copper and Aluminium. I think that's the case with the triangular bus bars, which are intended to deliver a knife-edge (and therefore better) contact surface. A metal tool accidentally shorting out a 15,000 Amp power supply can be a spectacular event! and as stated above it's in line with 1000 Amp/sq.in. There is a resistance due to the contact of the two pieces (header bar-busbar) and this can be calculated using Holm's equation (is an inverse function of the square root of load), however I have differing ideas in how to calculate the resistance through the buswork (through the triangular bar) as the contact is initially on the edge, rather than the end of the triangle. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. I don't see how the voltage drop and cross section calculation you wish to do is any different than Khaled's example which I just worked for you. After calculating voltage drop (V 10.2, please correct me if I'm wrong) the loss in voltage first will result in not getting required voltage at the bus end and heat dissipation will be high (about 20.4 KVA again correct me if I'm wrong) even if I adjusted the source voltage to compensate for the voltage drop the heat is high. 0000014437 00000 n I dont think the busbars are sufficient to carry that current but these are the standard busbars they send to everyone?? For DC bussing for a rectifier, however, I think the standard number used for decades, 1000 amps/square inch for open air bussing, is an easier and safer approach. f8\rb;5ezI>KW_~{/b2\Sw91ZO[7_I`69?p_bCxT,(z'A>*p/P~Sq Good day Mihai. 3. I believe de-rate AC values around 30%. I cannot reuse them and I don't want to.

As in whether it is better or worse. Sincerely yours, A. Hi cousin Hojat. trailer A. Hi Ajay. If you didn't understand something and want clarification, that's fine -- people will try explaining it in different words but few readers will even read let alone try to answer a question that was already answered and is then simply repeated :-). resistance specific dc formula wire physics conductor current solving volume circuits electric