Oil Circuit Breaker Di-electric Results
Oil Circuit Breaker Di-electric Results
(OP)
I'm wondering if anyone can assist. I'm looking for typical di-electric test results for 11KV OCB oil. I am situated in Australia, and have checked the relevant standard, which provides good info for testing technique and equipment but nothing in regard to what breakdown voltage levels would be expected for used OCB oil.
Any help would be much appreciated.
Any help would be much appreciated.






RE: Oil Circuit Breaker Di-electric Results
RE: Oil Circuit Breaker Di-electric Results
RE: Oil Circuit Breaker Di-electric Results
The IEEE Std C57-106 suggest a DBV> 25 kV for aged oil circuit breaker in service measured using ASTM Std D 877. This standard consisting of disk electrode system of 25 mm diameter square-edged disks separated by 2.5 mm. For reference see column 9 on the enclose table http://www.nttworldwide.com/docs/nttdiag.pdf. Similarly the Western Area Power Administration use 25 kV as described on page 6 of the enclose publication http://www.wapa.gov/rm/psmmCHAP-07.pdf
On the other hand, the standard practice of the US Department of Interior- Bureau of Reclamation use a DBV> 20 kV for oil circuit breaker. They also recognize that some manufacturer's instructions even allow 16 kV. See page 6 in the enclose site http://www.usbr.gov/power/data/fist/fist3_16/fist3-16.pdf
Beware that oil is not necessarily in good condition even when the dielectric strength is OK because this do not count for carbon, acids, gases and metal particles in the oil.
There are other supplementary tests used to diagnostic OCB conditions such as DISSOLVED GASES IN OIL, PARTICLE COUNT, PARTICLE TYPE AND OIL QUALITY. For additional reference, consult NETA, Doble Test or similar organizations.
RE: Oil Circuit Breaker Di-electric Results
20kV should do you as a good start.
RE: Oil Circuit Breaker Di-electric Results
RE: Oil Circuit Breaker Di-electric Results