Temperature Rise
In many cases it is desirable to limit the temperature rise of a shunt for increased accuracy and stability or to protect other equipment near it. A satisfactory de-rating factor “K2” may be obtained from:
K2 = 1 – t / 125
where “t” is the difference between the rated and the newly imposed rise limit.
Example:
Suppose
100°C is 75 degrees above the ambient, so T = 75°C, and the rated rise A is 100°C.
Therefore:
Pout = Pmax x (1-75 / 100) = Pmax x 0.25
Pmax = 0.66 x Prated = 0.66 x (150 x 0.05) = 4.95 watts
Pout for an ambient of 100°C is Pout = 4.95 x 0.25 = 1.23 watts,
60 Amps will be the maximum load.
Canadian Shunt Industries Inc.
80 Bullock Drive, Unit 1
Markham, ON L3P 3P7
Canada
1.800.433.5604
T 905.294.5274
F 905.294.5096
Posted by cshunt 
