redox
Electrical
- Nov 6, 2002
- 17
We are using diesel-electric trucks in our mine. (open-pit) When the trucks take some inclines, they use overhead lines, or pantograph lines, to supply them with electricity.
It is 1600V DC, and it is supplied through 1440kW 11kv/1200V 3ph transformers, and then rectified with a three phase bridge rectifier to 1600V. (six diodes) Some of the lines is almost a kilometer long, and have up to seven substations.
I have noticed that the transformers is in a certain order: Dd0 - Yd1 - Dd0 - Yd1 etc.
Firstly, is there any reason for this arrangement?
Secondly, does the phase shift (of different transformers) has any affect?
It is 1600V DC, and it is supplied through 1440kW 11kv/1200V 3ph transformers, and then rectified with a three phase bridge rectifier to 1600V. (six diodes) Some of the lines is almost a kilometer long, and have up to seven substations.
I have noticed that the transformers is in a certain order: Dd0 - Yd1 - Dd0 - Yd1 etc.
Firstly, is there any reason for this arrangement?
Secondly, does the phase shift (of different transformers) has any affect?