vacuum bottle failure
vacuum bottle failure
(OP)
Anyone who knows on how to evaluate the vacuum bottle integrity for 13.8kV VCB?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: vacuum bottle failure
RE: vacuum bottle failure
Whose breaker is it?
Be aware of possibility of emitting x-ray radiation when high-potting vacuum bottles.
RE: vacuum bottle failure
RE: vacuum bottle failure
Thanks Dpc, i will be cautious about x-ray radiation. But i think, it depends on the test voltage exceeding the latter will emit intolerable radiation and also with the distance of the personnel upon testing, the closer he is, the higher the radiation he have.
Dpc, it is a Westinghouse VCP - W.. Do you know the standard hi-pot testing procedure of this unit? I badly need it, since we haven't enough manual on this. So with, the vacuum replacement procedure manual.
Anyone can give me infos about his matter is highly appreciated!!
Im also thankful to the contributors of this thread!
RE: vacuum bottle failure
sorry for this..
RE: vacuum bottle failure
RE: vacuum bottle failure
If you care to buy them visit www.netaworld.org and look into 'publications'.
RE: vacuum bottle failure
PWR, "You apply the potential to the top stab of a given pole and ground the other 5 stabs to the frame and the frame to an external ground (such as is available in the cubicle the breaker was removed from)."
Do you mean there will be a three sets of testing as 1 test per pole? and obviously, does the interrupter contact is open while carrying the test? how i wish you further elaborate the procedure...
rbulsara, im glad you give me a copy of that stuff..
guys, how thankful i am with your contribution to this thread..
RE: vacuum bottle failure
RE: vacuum bottle failure
RE: vacuum bottle failure
Test procedure is outlined in manual as follows:
With the breaker element open, connect all top primary
studs (bars) together and to the high potential machine
lead. Connect all bottom studs together and ground
them along with the breaker frame. Start the machine at
zero potential, increase to appropriate test voltage and
maintain for one minute.
A successful withstand indicates that all interrupters
have a satisfactory vacuum level. If there is a breakdown,
the defective interrupter or interrupters should be
identified by an individual test and replaced before placing
the breaker in service.
After the high potential is removed, discharge any electrical charge that may be retained. To avoid any ambiguity in the ac high potential test due to leakage or displacement (capacitive) current, the test unit should have
sufficient volt-ampere capacity. It is recommended that
the equipment be capable of delivering 25 milliamperes
for one minute.
Although an ac high potential test is recommended, a dc
test may be performed if only a dc test unit is available.
RE: vacuum bottle failure
NETA ATS and MTS both recommends insulation resistance and overvoltage testing in strict accordance with manfacturer's recommendations with contacts open. Advises to take safeguard against X-radiation.
If this for a company or business, I suggest you have them buy the standards. If you let me know your email/fax I may be able to fax a page or two relevant to VCB testing.
RE: vacuum bottle failure