Dear All,
We are also going to have exactly same situation of two zig zag transformer at 33 kv bus working in parallel to increase the ground fault level. I would like to know explanation of higher harmonic levels. So far I know, one of the purposes of putting zig zag is to limit the harmonic...
We are using zig-zag transformer for system earthing in 33 kV, 6.6 kV system in an Oil and Gas Industry. Zig-zag transformer is earthed via a resistor to limit the fault current to 200 A. Now, we want to increase fault current to 400 A. Proposal is to connect another zig-zag transformer. This...
Please refer to page number 325 of 7SA513 V3 manual where storage criterian is writen.
I am mentioning some salient points:
It is recommended to reduce storage temperature to the range +10 deg cent to +35 deg cent this prevents from early aging of electrolytic capacitors which are contained in...
Dear All,
We want to use same CT core for low impedance transformer differential protection as well as high impedance REF protection. That is, both low impedance transformer differential relay and high impedance REF relay is in series with phase CT core.
Does it work?
What is the use of earthing one end of tertiary delta winding of an auto transformer? Does it help to detect earth fault in tertiary winding? If tertiary winding is not loaded is it necessary to earth tertiary winding?
