Hi, I have a 22kV source transformer 66/22 Dyn3, and downstream of the 22 I have a 22/11 grounded auto-transformer Yna0. If I have a single phase to ground fault on the 11kV side of the auto-transformer of magnitude (say) 100A, how many earth fault amps will the 22kV relay back at the source...
Hi
What are the advantages and disadvantages of solidly grounding the negative pole of a substation DC system. The DC system would be operating at 48V DC and would be used for protection & control systems. The ground/earth would rise as a result of AC system ground faults and the likes, but...
The problem,
Pole Mounted Transformer (Delta-Star), 22000/415V.
Proposal is to install lightning arresters on 22kV side, mounted to tank.
Tank earthed to pole earth, LV cable also connected to same earth.
If lightning arrester discharges then possibility that HV voltage transferred into LV...
Here's the picture. An 11kV 3 phase overhead system is supplied from a 33/11kV Dyn transformer. All along the route of the 11kV line are Dyn connected distribution transformers 11/0.4kV. A few kilometres down the 11kV line is connected an auto transformer with ratio 2:1 to step the 11kV voltage...
I have to apply protection to an 11/22 kV step up 3 phase auto transformer. The protection relay is a MiCOM with basic OC & EF elements. The autotransformer is solidly grounded so there is in effect a zero sequence source in front of thew relay. The source side is solidly earthed i.e the 33/11...
A 33kV feeder of ours connects to a remote substation B with a single 33/11kV Dyn11 transformer connected at B, and an 11kV distribution board at B. The relay on the 33kV feede CB at Substation A has Overcurrent & Earth Fault protection. There was a phase to phase fault and the 11kV CB at...
What are the advantages & disadvantages of solidly earthing one pole of a 48VDC substation battery? I have a system that i'd like to tie the positive to the substation earth mat, is this a good or bad idea?
