Simple and Easy Way Calculate Bus Bar Size and Voltage Drop

In fact, a type of copper or aluminum conductor or rod that collects and distributes electrical energy through one or a single circuit.

Many connections in different establishments, factories, mill-factory electrical wiring Busbar Taken from. The drill machine is drilled into the busbar and the Lux is connected to the knot by connecting the nut.

Through this busbar, people can access electricity from one system to another, just as people use a bridge or bridge to cross over a river or lake.

In the industry HT side Electricity from the LT side, It can be accessed through this bus connection. Also, if there is an error in any part of the system through the bus active part Who faulty part Can be distinguished from Even if one system is shut down, the other system is still running.

The ideal busbar features are:

1)The material of the busbar is low resistance

2) The resistance of the busbar varies very little with temperature

3) High mechanical strength.

Use of busbar

  • The power connection can be given very easily in one or more places.
  • When a system is shut down, the rest of the system can be operated by the busbar.
  • Maintenance, In this case, one part can be operated with the help of Busbar, without having to shut down the whole system.
  • If any part of the system is found to be defective, it can be separated from the active part by busbar.

Busbar Usually they are of different sizes. Different size depending on the load or current capability Busbar  Is done The busbar leaves are usually wide 1/2 ”, 3/4”, 1 ”, 1.5” Or 2″There may be up and fulfillment 1/8″From1/2″ Or the current can be higher depending on the carriage capacity.

All the features of the busbar need to be:

  • In the case of the busbar, the material with less resistance should be used.
  • Resistance will not decrease with temperature and time changes.
  • For insulation as needed Busbar- There should be enough gaps between them.
  • Higher mechanical strength should be used with qualitative substances.
  • In the future, any changes to the system should be modified.

Types of living

Depending on the material, there may be two types of dwellings. Namely –

  1. Copper busbar
  2. Aluminum busbar

Also depending on the setup, the busbar can be of two types.

  1. Indoor busbar
  2. Outdoor Busbar

There are again five types depending on the composition. Namely:

  1. Open busbar
  2. Enclosed busbar
  3. World Driving Busbar
  4. Gas-insulated busbar
  5. Isolated phase busbar

Bus management

  • SingleBusbar
  • Sectional single Busbar
  • Sectional double Busbar
  • Double Busbar Single Brake System
  • Ring Busbar

Factors and things to consider when choosing a bus

  • In case of operation of the plant, complete or partial operation as required
  • Load quantity or load current
  • Local conditions
  • The initial cost of deployment.
  • Operating and maintenance costs
  • The benefits of expanding in the future
  • Busbar The shape is the direction of the shape
  • Safe areas remain specific
  • The shape of the busbar
  • The initial cost
  • Safe place

Busbar Size Calculations

busbar sizing calculations

Busbar  Can be very large or small. Busbar  Basically, how big and how thick it depends on the current ampere of the busbar.

One thing to keep in mind, Busbar  Height and width are very important in calculations. Measurements in millimeters must be calculated in millimeters.

Bas-bar calculations

Take us 450 There is a KVA transformer that has a line voltage VL = 400 Volts,

So the current,  I(A) = 1000 × S(kVA) / (√3 × VL )=1000*450/1.732*400=649.519 A

01) So, total umpire + 25% Have to take the extras.

(Coming from Transformer 649amp. And all the time 649mp  Cannot be found It may be less 25%Extras captured. Damage if the bus load is low. However, taking more is not harmful. If you take less, you will burn in extra umpires. No more damage if taken more. As mentioned above25% Have to take more What does that mean  649 More than that Then take more 0.25 If you do not multiply it 1.25 Multiplied down by?) 

So, (649.519 x 1.25) = 811.89A

If necessary 812A  Basar Formula:

2A = 1mm ^ 1A = 1/2 mm^

812A = 406mm^ (Need to stay)

B: Well, it’s good to say here 2 Hall Copper Density (1.7~2) So far

1.7 If you can catch the extras 25%No need to add.

It’s good to say here, Height x thickness Multiply 406mm^ Let’s take it closer.

Now we 80×5=400 Take it 

Size of the bus

19.05 MM*6.35MM = 100A

25.4MM*6.5MM = 200A/250A

30MM*10MM = 400A

40MM*10MM = 600A

44.45MM12.7MM = 800A

50.8MM*12.7MM = 1000A

2*63.5MM*9.525MM = 1600A

2*80MM*10MM = 2500A

Basar calculation 2:

Suppose, in my industry three phase 500 KVA One of them  11/.44 KV There are transformers. Now i’m her outgoing side  Let me choose the current bar for the current one that I own LT pannel Let’s set it up. Let’s calculate.

Current I (secondary)

= 500 x 1000/ (1.732 x 440)
= 656 Ampere

Now for more security  25% Extras should be added.

Then = 656 x 1.25 = 820 A

Now, if I use Copper busbar, per se 1A for this 0.5 sqmm busbar Should be used. And for aluminum  1.2 sqmm per ampere.

So if I use copper, mine  820 amps load for this 410 sqmm busbar Should be used.

But you have to keep in mind that this acute size busbar is available in the market ?? Typical size of the busbar available in the market:

25 x 5, 25 x 8, 25 x 10, 30 x 5, 30 x 8, 30 x 10,
40 x 5, 40 x 8, 50 x 5, 50 x 8, 50 x 10, 80 x 5, 80 x 8, 80 x 10, 100 x 20, 110 x 10 sqmm etc

So for our load 80 x 5 or 40 x 10 or
50 x 8 sqmm busbar  Enough is enough

Now you have to make a cable connection with Busbar. This connection can be made very easily by drilling screws on the busbar with cable screws.

Second Calculation Cartesi: Iqbal Mahmood




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Mani_S says:

Thank u for this useful information…I want to know what is the minimum size of busbar for 35kA,50kA,and 100kA busbar..what is the formula to calculate the busbar as per short circuit ratinge

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