Distribution Line Protection Question
Distribution Line Protection Question
(OP)
Hello,
It seems that the pickup setting for time-overcurrent relays protecting overhead distribution lines is typically well above the ampacity of the conductor. Can someone explain why this is?
Is the thermal capacity of the line greater than the ampacity given in tables?
Thanks for the help.
It seems that the pickup setting for time-overcurrent relays protecting overhead distribution lines is typically well above the ampacity of the conductor. Can someone explain why this is?
Is the thermal capacity of the line greater than the ampacity given in tables?
Thanks for the help.






RE: Distribution Line Protection Question
RE: Distribution Line Protection Question
I'm not aware of one.
Jim T
RE: Distribution Line Protection Question
RE: Distribution Line Protection Question
Rafiq Bulsara
http://www.srengineersct.com
RE: Distribution Line Protection Question
With a thermal time constant on the order of 15 minutes, operators often have an opportunity to move load around before the wires exceed the allowable temperatures.
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