Vacuum bottle in gas insulated switchgear
Vacuum bottle in gas insulated switchgear
(OP)
I was asked to have the vacuum circuit breaker tested during routine maintenance process in the MV gas insualted switchgear. But there is no access to do the test on vaccum CB in these Siemense 8DA10 series GIS. The insulation testing, hi-pot test can be done at main circuit level with CB closed. Does have any experience on this? How to check the VCB on routine base.






RE: Vacuum bottle in gas insulated switchgear
if the hipot test set does not trip-out, the bottle is good.
Test value as per manufacturer's recommended level, or as per NETA standard in its absence. Test values the same for acceptance or maintenance and they are at .75 of factory test level.
RE: Vacuum bottle in gas insulated switchgear
RE: Vacuum bottle in gas insulated switchgear
RE: Vacuum bottle in gas insulated switchgear
Yes you have to place the breaker in the Open state snd configure the bus such as that you can energized one side of the breaker with the AC hipot test set.
The leakage current through the vacuum medium is then measured at the opposite terminal to ground. You csn either do this will a micro-ammeter or use the guard leaf from the test set. If provisioned with fisterer connectors, you need the mating end for proper connection.
Depending on the KV class you may need special connectors if your gear is provisioned with fisterrer connector, else if I am correct from a quick google of your breaker, isolate the cables and make connection there. The other side could probably be connected to the grounding switch provided there is an external connection to ground to break where leakage current can be taken. Switch is grounded so it connects to the bus side as in a feeder breaker, else you need an outage where the main bus needs to be energized and the leakage measurement taken at the load side breaker connection point.