mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Ok, bear with me.
Is there any special way- or rather how do you- distribute the MV circuits in to the LV system in an underground network? So far classical engineering text books typically show feeders A, B, C, D, E, F, G, H each supplying an individual network transformer sequentially one after another. All 8 feeders loop and siz zag around the LV mesh from start to finish with each segment or quadrant of that LV mesh receiving an equal input from all 8 feeders, (ie upper west zone 2 network transformers feeder A, 2 network transformers feeder B, 2 from C... middle north zone 2 network transformers feeder A, two B, two C, ect.
Now- another scenario.
Each quadrant is fed by only a few feeders rather than all of them. Ie North Quad 1 is fed via A, B, C, North Quad 2 B,C,D quad 3 C,D,E, North Quad 4 D,E,F, ; middle Quad 1 E, F, G middle quad 2 F, G, H, middle quad 3 G, H, A middle quad 4 H, A, B ; south quad 1 A,B,C and so forth...
The idea is that should the network ever exceeded N+2 or N+3 (such as a bus fault or serve vault/manhole fire) a certain LV area will always be deprived of an MV source. The intent here is that this will produce depressed secondary voltages reducing KW consumption for each building in turn protecting the remaining MV feeders from over load and prevent LV network cables from overheating.
Is this possible? Is it done in the real world?
I know people will bring up critical customers and that this will back fire on them due to being predominately motor and none linear based, however these will be fed from either dedicated spot network feeders (I, J, K, L) or be able to transfer from feeders A,B,C,D to E,F,G,H automatically being spared this operating procedure.
Is there any special way- or rather how do you- distribute the MV circuits in to the LV system in an underground network? So far classical engineering text books typically show feeders A, B, C, D, E, F, G, H each supplying an individual network transformer sequentially one after another. All 8 feeders loop and siz zag around the LV mesh from start to finish with each segment or quadrant of that LV mesh receiving an equal input from all 8 feeders, (ie upper west zone 2 network transformers feeder A, 2 network transformers feeder B, 2 from C... middle north zone 2 network transformers feeder A, two B, two C, ect.
Now- another scenario.
Each quadrant is fed by only a few feeders rather than all of them. Ie North Quad 1 is fed via A, B, C, North Quad 2 B,C,D quad 3 C,D,E, North Quad 4 D,E,F, ; middle Quad 1 E, F, G middle quad 2 F, G, H, middle quad 3 G, H, A middle quad 4 H, A, B ; south quad 1 A,B,C and so forth...
The idea is that should the network ever exceeded N+2 or N+3 (such as a bus fault or serve vault/manhole fire) a certain LV area will always be deprived of an MV source. The intent here is that this will produce depressed secondary voltages reducing KW consumption for each building in turn protecting the remaining MV feeders from over load and prevent LV network cables from overheating.
Is this possible? Is it done in the real world?
I know people will bring up critical customers and that this will back fire on them due to being predominately motor and none linear based, however these will be fed from either dedicated spot network feeders (I, J, K, L) or be able to transfer from feeders A,B,C,D to E,F,G,H automatically being spared this operating procedure.
