DC voltage dip
DC voltage dip
(OP)
We have a bank of lead acid batteries providing substation dc power.
Recently, during an event, we had a dip in our station power, which of course caused a dip on the input voltage to the charger.
At the exact same time the station power dipped, our DC voltage dipped from 134v to 78v, but for only 10 cycles, then recovered to full voltage.
Comments?
HP
Recently, during an event, we had a dip in our station power, which of course caused a dip on the input voltage to the charger.
At the exact same time the station power dipped, our DC voltage dipped from 134v to 78v, but for only 10 cycles, then recovered to full voltage.
Comments?
HP






RE: DC voltage dip
RE: DC voltage dip
RE: DC voltage dip
yours
RE: DC voltage dip
Was the dip longer than 10 cycles? What kind of charger is it: switchmode or thyristor? The switchmode types are usually more forgiving of input disturbances because they can react very quickly and typically have very broad input voltage ranges.
Invest in a load discharge test for your battery. A fault in a substation whose breakers have no tripping power could turn ugly very easily. If people argue over cost of the test and probably a new battery too, enquire whether their budget stretches to a new substation.
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I don't suffer from insanity. I enjoy it...
RE: DC voltage dip
The bank was just recently tested and all was good. It was not however discharge tested or load tested.
Have any of you heard of the term " Coup De Fouet "
HP
RE: DC voltage dip
RE: DC voltage dip
Probably the insurance carrier told management that the batteries must be tested but did not specify the test procedure on the same page. Management issued a directive,
"Check the batteries but don't take too much time and don't take anything out of service."
I believe it's called "Checking the boxes."
I often don't know if I'm a cynic or a realist.
yours
RE: DC voltage dip
HP
RE: DC voltage dip
I apologise. I understand your restraints. Is it possible to turn off the battery charger and monitor the voltage for long enough to see if the voltage drop is excessive?
yours
RE: DC voltage dip
RE: DC voltage dip