electricalperson
Senior Member
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- massachusetts
how does someone do a zero sequence test?
zero sequence
- Thread starter electricalperson
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peter d
Senior Member
- Location
- New England
OK, I'll bite. I have no clue what you're talking about. More information is needed as to what you're trying to accomplish.
mdshunk
Senior Member
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- Right here.
You doing some work in a powerhouse?
- Location
- Massachusetts
mdshunk
Senior Member
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- Right here.
Best I got:
electricalperson
Senior Member
- Location
- massachusetts
i was just curious because i heard people talking about doing a zero sequence test to find a problem and i was wondering what that test is used for and how to do it
mdshunk
Senior Member
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- Right here.
Really? Are you sure they didn't mean fall of potential test?electricalperson said:
Perhaps you're thinking about the zero sequence GFPE mehtod to operate the GFP relay?
electricalperson
Senior Member
- Location
- massachusetts
maybe thats what it ismdshunk said:
electricalperson
Senior Member
- Location
- massachusetts
mentioned by brian john in this thread http://forums.mikeholt.com/showthread.php?t=95584&highlight=sequence
mdshunk
Senior Member
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- Right here.
Oh, okay. That clears it up.electricalperson said:
Put an amprobe around all the hots and the neutral for each feeder. It should read 'zero'. If it doesn't, then current is passing someplace other than the neutral for that feeder.
electricalperson
Senior Member
- Location
- massachusetts
so take a flexible amprobe CT and wrap it around all the feeder conductors? sounds easy..just now i need to buy an amprobe that can take a flexible lead:grin:mdshunk said:
mdshunk
Senior Member
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- Right here.
If you ever tear out an old switchboard with GFP, save some of the stuff and make your own go/no-go rig.
brian john
Senior Member
- Location
- Leesburg, VA
The test is performed when trying to locate the source of neutral to ground connections. When taking measurements on all four conductors the reading should equal "0" (zero) or close to this. When there is ground current, taking these readings at each panel can help isolate the source.
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