# US 2017/0288560 A1 · Arrangement for connecting a railway power supply for a railway track to a three-phase supply network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288560 A1 - Document ID: US20170288560A1 - Status: Published application - Kind: A1 - Application number: 15/507,266 - Filed: 2015-07-14 - Published: 2017-10-05 - Earliest claimed: 2014-08-29 - Assignees: Siemens Aktiengesellschaft - Applicants: Siemens Aktiengesellschaft - Inventors: WOLFGANG BRAUN; RAINER GRUBER - Web page: https://patentgrep.com/patent/US20170288560A1 ## CPC - H02M 5/14: for conversion between circuits of different phase number - H02J 3/26: Arrangements for eliminating or reducing asymmetry in polyphase networks - H02M 5/10: using transformers - H02M 7/4835: {comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage} - B60M 3/00: Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power (controlling rail vehicles by varying voltage of power fed to vehicle B60L; power distribution in general H02J) - Y02E 40/50: Arrangements for eliminating or reducing asymmetry in polyphase networks - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B60M: POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES (control of points and safety arrangements along railway lines B61L; construction of rails and points in general E01B) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract An arrangement for connecting a railway power supply for a railway track to a three-phase supply network. The arrangement has a three-phase AC transformer and a balancing device for a uniform electric load of the three phases of the three-phase supply network. The three-phase AC transformer is configured for connecting to the three-phase supply network on the primary side and is connected to the balancing device on the secondary side. The three-phase AC transformer is configured for connecting to a railway power supply which has an autotransformer system with two contact lines and two conductors that are carried along the railway track in an insulated manner. ## Claims ### Claim at position 1 1-13. (canceled) ### Claim 14 An arrangement for connecting a railroad power supply for a railroad track to a three-phase supply network, the arrangement comprising: a balancing device for a uniform electric load of three phases of the three-phase supply network; a three-phase AC transformer having a primary side to be connected to the three-phase supply network and a secondary side connected to said balancing device; said three-phase AC transformer being configured for connection to a railroad power supply which has an autotransformer system with two contact lines and two conductors that are carried along the railroad track in an insulated manner. ### Claim 15 (depends on 14) The arrangement according to claim 14, wherein said three-phase AC transformer is a three-winding transformer. ### Claim 16 (depends on 14) The arrangement according to claim 14, wherein said three-phase AC transformer has a star connection on said primary side. ### Claim 17 (depends on 15) The arrangement according to claim 15, wherein said three-phase AC transformer has a first delta connection on said secondary side which causes a phase shift of a voltage of 150° with respect to said primary side. ### Claim 18 (depends on 17) The arrangement according to claim 17, wherein said three-phase AC transformer on said secondary side has a second delta connection which causes a phase shift of a voltage of 330° with respect to said primary side. ### Claim 19 (depends on 18) The arrangement according to claim 18, wherein a connection point of said first delta connection and said second delta connection is connected to ground potential and to said balancing device. ### Claim 20 (depends on 17) The arrangement according to claim 17, wherein said first delta connection of said three-phase AC transformer is connected to the balancing device and is configured for supplying said two conductors that are carried along the railroad track in an insulated manner. ### Claim 21 (depends on 18) The arrangement according to claim 18, wherein said second delta connection of said three-phase AC transformer is configured for supplying said two contact lines. ### Claim 22 (depends on 14) The arrangement according to claim 14, wherein said three-phase AC transformer comprises a vector group YNd5dll according to standard DIN VDE 0532. ### Claim 23 (depends on 14) The arrangement according to claim 14, which further comprises at least one of an additional three-phase AC transformer or an additional balancing device connected to enable the arrangement to supply energy to two electrically separate contact line sections, each having two contact lines. ### Claim 24 (depends on 23) The arrangement according to claim 23, wherein said additional three-phase AC transformer and/or said additional balancing device is configured to supply the two electrically separate contact line sections with energy if a three-phase AC transformer and/or a balancing device fails. ### Claim 25 (depends on 14) The arrangement according to claim 14, wherein said balancing device has a three-phase self-commutated voltage-controlled converter. ### Claim 26 (depends on 14) The arrangement according to claim 14, wherein said balancing device has a modular multilevel converter.