Let's say a hydrogen fuel cell has an output of 200 amps at 24 volts. This output is supposed to be isolated from the chassis. Somewhere in the fc is a pinched wire. Measuring from the positive output to chassis thru a 2.5k ohm resister displays 10ma. What is the current rating of the actual short? |
by mu34tant
March 30, 2019 |
ground of 24v battery is connected to chassis. |
by wangwg88
April 01, 2019 |
yes, the test lead has a 2.5kohm resistor in series with the probe. the vmm reads 10ma. what is the actual short current? |
by mu34tant
April 01, 2019 |
24v/2.5k=10ma, so all short current goes through your 2.5k resistor. if you don't connect resistor on, there is no short current. |
by wangwg88
April 01, 2019 |
not true, there is always short current because there is a short |
by mu34tant
April 03, 2019 |
you need to prove that there is a short. otherwise, no short. |
by wangwg88
April 03, 2019 |
no. the short is always there. sometimes the resistor (load) is not present. what I am trying to figure is the maximum current draw across the pinched wire contacting the frame. some short draw more current than others. some draw 1 ma across the test resistor. how can i figure the max current the short will handle from my test? |
by mu34tant
April 04, 2019 |
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