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Growler
- Thread starter wbd
- Start date
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- #3
candu6's definition of a 'growler' is accurate, in my experience.
Typically, ungrounded delta systems have had the 'three lamp' system, which shows if one phase has gone to ground. Each of the three lamps are connected between each phase and ground, and, for normal conditions, are all equally illuminated (dimly). If one phase goes to ground, that lamp will go out, and the other two lamps will illuminate brightly.
How to use a growler to find the connection to ground is not clear, since it is basically an induction coil.
There are other detection methods used for ungrounded systems. I have seen some GE switchboards with a 'pulse' system, though I am not familiar with the operation principle.
Typically, ungrounded delta systems have had the 'three lamp' system, which shows if one phase has gone to ground. Each of the three lamps are connected between each phase and ground, and, for normal conditions, are all equally illuminated (dimly). If one phase goes to ground, that lamp will go out, and the other two lamps will illuminate brightly.
How to use a growler to find the connection to ground is not clear, since it is basically an induction coil.
There are other detection methods used for ungrounded systems. I have seen some GE switchboards with a 'pulse' system, though I am not familiar with the operation principle.
Examples of pulsing systems for high-resistance-grounding:
There are low-range large-jaw clamp-on ammeters for fault tracing.
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- #7
RRaghunath
Electrical
"Biddle" has (used to?)an instrument for detecting earth faults in un-earthed DC systems. The name "Growler" reminds me of that.
RalphChristie
Electrical
wbd
I am not familiar with the name "growler" but to add to your and DanDel's comments:
We use a "thumper" (surge generator) to detect faults on buried MV cables. But sometimes, when there is a fault with a very low resistance, a thumper is not effective to find the location of the fault. Then we use an instrument called a burn-down (maybe a growler?) to circulate a high current through the cable to burn it, and to increase the resistance to find the fault with the "thumper"
Burn-down - Surge generator -
Regards
Ralph
I am not familiar with the name "growler" but to add to your and DanDel's comments:
We use a "thumper" (surge generator) to detect faults on buried MV cables. But sometimes, when there is a fault with a very low resistance, a thumper is not effective to find the location of the fault. Then we use an instrument called a burn-down (maybe a growler?) to circulate a high current through the cable to burn it, and to increase the resistance to find the fault with the "thumper"
Burn-down - Surge generator -
Regards
Ralph
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