How Do You Calculate the Temperature Rise of a Bimetallic Strip in an MCB?

  • Thread starter Thread starter physiomaniac
  • Start date Start date
  • Tags Tags
    Calculation
AI Thread Summary
The discussion focuses on calculating the temperature rise of a bimetallic strip in a miniature circuit breaker (MCB) when a specific current is applied. The user has the necessary physical properties of the strip and has attempted to use the formula MC(dT)=I^2Rt to estimate temperature rise. However, they note that this formula only accounts for heat generated and does not consider heat loss to the environment or variations in resistivity over time. To improve accuracy, it is suggested to include a convective heat transfer term with an estimated heat transfer coefficient. This highlights the need for a more comprehensive approach to account for environmental factors in the calculation.
physiomaniac
Messages
1
Reaction score
0
I am studying the bimetallic strip used in MCB.
I am trying to theoretically calculate the temperature rise of the strip when 1.13In (safe value of current for which the MCB shouldnot trip) is passed through the bimetallic strip. I am having the dimensions, resistivity, modulus of elasticity, flexivity, density of the strip.

I even have the practical values with me for ever few secons of current passed.
I tried to use the relation MC(dT)=I^2Rt
that is all the heat generated is used in the temperature rise.
But practically other things need to be considered like heat loss with environment, also the above formula holds good for only few seconds and here the resistivity I have taken constant will also vary.
Please help me out with a relevant solution.
 
Physics news on Phys.org
To correct the equation being used, one would need to include a convective heat transfer term, using an estimated heat transfer coefficient to the surroundings.
 
Thread 'Question about pressure of a liquid'

Thread 'Question about pressure of a liquid'

I am looking at pressure in liquids and I am testing my idea. The vertical tube is 100m, the contraption is filled with water. The vertical tube is very thin(maybe 1mm^2 cross section). The area of the base is ~100m^2. Will he top half be launched in the air if suddenly it cracked?- assuming its light enough. I want to test my idea that if I had a thin long ruber tube that I lifted up, then the pressure at "red lines" will be high and that the $force = pressure * area$ would be massive...
View full post »

Thread 'Why is the 3 body problem unsolvable? And what will happen if someone solves it?'

I feel it should be solvable we just need to find a perfect pattern, and there will be a general pattern since the forces acting are based on a single function, so..... you can't actually say it is unsolvable right? Cause imaging 3 bodies actually existed somwhere in this universe then nature isn't gonna wait till we predict it! And yea I have checked in many places that tiny changes cause large changes so it becomes chaos........ but still I just can't accept that it is impossible to solve...
View full post »

Similar threads

I How to understand experiment to measure heat capacity of solid?
Replies
1
Views
2K
How does the rise in temperature of fuse wire depend upon its radius?
Replies
12
Views
1K
I How to Calculate electron temperature of Arc Plasma?
Replies
2
Views
2K
I Extremely strange consequence of the speed of heat value
Replies
19
Views
2K
How do you Calculate Ampacity of a Conductor Geometry?
2
Replies
64
Views
5K
Engineering Current density calculation in anisotropic ferromagnetic film
Replies
7
Views
2K
Why Did the Temperature Rise in a Sealed Automotive Cooling System?
Replies
18
Views
2K
B Troubleshooting Battery Internal Resistance Measurements
3
Replies
105
Views
10K
When air pressure drops in a pipe due to friction losses, how do you calculate the associated temperature drop?
Replies
8
Views
1K
I Calculation of temperature changes (heating a cube in a microwave oven)
Replies
9
Views
3K

Hot Threads

Recent Insights

Back
Top