Assembly for connection to a high-voltage system with adjustable impedance
An assembly for connection to a high-voltage system has multiple single-phase transformers each having a transformer tank which is filled with a fluid and in which a core with at least one winding is situated. At least some of the windings of the single-phase transformers are connected to one another, forming a neutral point. A short-circuit voltage curve or impedance of the assembly can be adapted to different requirements. The windings are each connected to the neutral point via a switchover unit and a choke winding. The choke winding has multiple tappings, and the switchover unit is configured to select the tapping via which the winding in question is connected to the neutral point.
1. An assembly for connection to a high-voltage system, the assembly comprising:
a plurality of single-phase transformers each having a transformer tank filled with a fluid and a core with at least one core winding disposed in said transformer tank;
a neutral point;
a switchover unit and a choke winding connecting said at least one core winding of each of said cores to said neutral point;
said choke winding having multiple tappings and said switchover unit being configured to select a respective one of said tappings through which the respective core winding of said core is connected to said neutral point; and
wherein each of said transformer tanks is fitted with at least one lead-through socket that holds a lead-through socket contact in an insulated manner at said transformer tank, and wherein a lead-through socket contact is connected via a terminal connection to said at least one core winding.
2. The assembly according to claim 1 , wherein said switchover unit is a power stepping switch or a load stepping switch.
3. The assembly according to claim 1 , wherein said switchover unit is a reconnection unit that can only be switched when not under load.
4. The assembly according to claim 3 , wherein said reconnection unit is configured for manual actuation.
5. The assembly according to claim 1 , wherein said switchover unit and said choke winding are situated outside said transformer tank and are connected to said at least one core winding via a cable connection.
6. The assembly according to claim 1 , wherein said switchover unit and said choke winding are situated inside said transformer tank.
7. The assembly according to claim 6 , wherein said switchover unit is a reconnection unit situated inside said transformer tank and is disposed to face an adjusting hand-hole in a lid of said transformer tank.
8. The assembly according to claim 1 , wherein said switchover unit is a reconnection unit configured for electronic actuation.
9. An assembly for connection to a high-voltage system, the assembly comprising:
a plurality of single-phase transformers each having a transformer tank filled with a fluid and a core with at least one core winding disposed in said transformer tank:
a neutral point;
a switchover unit and a choke winding connecting said at least one core winding of each of said cores to said neutral point;
said choke winding having multiple tappings and said switchover unit being configured to select a respective one of said tappings through which the respective core winding of said core is connected to said neutral point;
wherein each of said transformer tanks comprises a cable socket that holds a cable socket contact in an insulated manner at said transformer tank, and wherein said cable socket contact is connected to said at least one core winding.
10. An assembly for connection to a high-voltage system, the assembly comprising:
a plurality of single-phase transformers each having a transformer tank filled with a fluid and a core with at least one core winding disposed in said transformer tank:
a neutral point;
a switchover unit and a choke winding connecting said at least one core winding of each of said cores to said neutral point;
said choke winding having multiple tappings and said switchover unit being configured to select a respective one of said tappings through which the respective core winding of said core is connected to said neutral point;
wherein each said transformer tank comprises a neutral point socket that holds a neutral point contact in an insulated manner at the transformer tank, wherein the neutral point contact is connected to at least one of said core windings.
11. The assembly according to claim 1 , wherein each said single-phase transformer is a modular transformer having a plurality of modules, including a tank module, an expansion container module, and a cooling module, and wherein said modules are releasably connected to one another.