hi,
I am working on 66kV switchgear maintenance. I like to know what is the minimum requirement for the SF6 purity (% volume). I cannot find it on the manual, it only give dew point requirement like -5 degree C for switchgear and -10 degree C for circuit breaker. Thank you.
We have 3 66/11 kV system transformers (18.8/27MVA) connected in parallel. Each transformer 11kV side have tap changer to keep the voltage at 11kV. I am wondering why some of automatic voltage regulator (MK 30) failed (indicated on it display screen), hence no automatic voltage regulation if the...
Hi,
I have this relay at site which may be more than 15 years old. The relay type is CDG31EG2012JD5. This relay is 3 poles Standard Inverse curve from the number 31 but is it 1.3s/10x curve, 3s/10x curve or other?
Thank you.
Hi,
Anyone have trip curve for Mitsubishi Electric No-Fuse Breaker NFE 800-s and Merlin Gerin Selpact In=1600A with protection type DN2 characteristic? I have try on the internet but cannot find. I suppose it is very old type.
Thank you.
Hi,
I have NZM12-1000 MCCB at site which I do not know much about. How to know the setting for overload time Tr is ON or OFF? This is a thermomagnetics type.
Thank you.
Dear all,
Where can I find the time/current characteristics for the 800A type J fuse used in Merlin Gerin LV SAIF feeder pillar (Type 1601). I have try the fuse manufacturer site - Lawson Fuses but did not find one.
Hope someone can help me on this? Thank you.
Hi,
A new 3 phase 110V VT circuit with earthed neutral, the cables and instruments connected to it have been meggered and found to be earth-free. Why 48V is measured when voltmeter is applied across the top and bottom of each of the three fuse holders? The three core cable is about 250m long. Is...
