# US 10,122,163 B2 · Scalable switchyard for interconnecting direct current power networks

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- Number: US 10,122,163 B2
- Document ID: US10122163B2
- Status: Granted
- Kind: B2
- Application number: 15/542,354
- Filed: 2015-01-30
- Published: 2018-09-27
- Granted: 2018-11-06
- Earliest claimed: 2015-01-30
- Assignees: ABB Schweiz AG
- Applicants: ABB Schweiz AG
- Inventors: Ritwik Majumder; Bertil Berggren; Giovanni Velotto; Tomas Jonsson; Soubhik Auddy; Jenny Josefsson
- Web page: https://patentgrep.com/patent/US10122163B2

## CPC

- H02J 1/10: Parallel operation of DC sources
- H02B 1/24: Circuit arrangements for boards or switchyards
- H02H 7/22: for distribution gear, e.g. bus-bar systems; for switching devices {(detecting mechanical or electrical defects in gas-insulated switchgears H02B13/065)}
- H01H 9/542: {Contacts shunted by static switch means}
- H01H 33/596: {for interrupting DC}
- H02H 7/268: {for DC systems}
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02B: BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

The invention concerns a switchyard for interconnecting direct current power networks and a direct current power transmission system comprising such a switchyard. The switchyard comprises a number of interconnected entities comprising at least two main circuit breakers and a number of transfer switches, where each network has two connections to the switchyard, at least one via a transfer switch, each main circuit breaker has four connections in the switchyard, two at each end of the main circuit breaker and at least one via a transfer switch, and each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers.

## Claims

### Claim 1

A switchyard for interconnecting at least three direct current power networks, the switchyard comprising a number of interconnected entities comprising:
at least two main circuit breakers, and
a number of transfer switches,
wherein
each network has two connections to the switchyard, each provided via a transfer switch,
each main circuit breaker has four connections in the switchyard, two at each end of the main circuit breaker each provided via a transfer switch, and
each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers,
thereby
each main circuit breaker is connected between two networks via two network interconnecting transfer switches, one on each side of the main circuit breaker, where there is at least one bypass branch in parallel with the main circuit breaker, which bypass branch comprises a bypass transfer switch and is connected between the two network interconnecting transfer switches, and
there is at least one circuit breaker interconnecting branch between the two circuit breakers and comprising a circuit breaker interconnecting transfer switch.

### Claim 2 (depends on 1)

The switchyard according to claim 1, wherein each network only has two connections to the switchyard and each main circuit breaker only has four connections in the switchyard.

### Claim 3 (depends on 1)

The switchyard according to claim 1, wherein a connection of one entity that is joined with a connection of another entity share transfer switch.

### Claim 4 (depends on 1)

The switchyard according to claim 1, wherein a first connection of a first network is joined with a first connection of a first main circuit breaker at a first end of the first circuit breaker.

### Claim 5 (depends on 4)

The switchyard according to claim 4, wherein a second connection of the first main circuit breaker at the first end is joined with a first connection of a second main circuit breaker at the first end of the second main circuit breaker.

### Claim 6 (depends on 5)

The switchyard according to claim 5, wherein a second connection of the first network is joined with a third connection of the first main circuit breaker at a second end of the first circuit breaker.

### Claim 7 (depends on 6)

The switchyard according to claim 6, wherein a fourth connection of the first main circuit breaker at the second end is joined with a first connection of a second network.

### Claim 8 (depends on 5)

The switchyard according to claim 5, wherein a first connection of a second network is joined with a third connection of the first main circuit breaker at a second end of the first circuit breaker and a second connection of the first network is joined with a second connection of the second network.

### Claim 9 (depends on 8)

The switchyard according to claim 8, wherein a fourth connection of the first main circuit breaker at the second end is joined with a second connection of the second main circuit breaker at the second end of the second main circuit breaker.

### Claim 10 (depends on 1)

The switchyard according to claim 1, wherein each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers when all main circuit breakers are operational.

### Claim 11 (depends on 1)

A direct current power transmission system comprising a switchyard according to claim 1.

### Claim 12 (depends on 2)

The switchyard according to claim 2, wherein a connection of one entity that is joined with a connection of another entity share transfer switch.

### Claim 13 (depends on 2)

The switchyard according to claim 2, wherein a first connection of a first network is joined with a first connection of a first main circuit breaker at a first end of the first circuit breaker.

### Claim 14 (depends on 3)

The switchyard according to claim 3, wherein a first connection of a first network is joined with a first connection of a first main circuit breaker at a first end of the first circuit breaker.

### Claim 15 (depends on 2)

The switchyard according to claim 2, wherein each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers when all main circuit breakers are operational.

### Claim 16 (depends on 3)

The switchyard according to claim 3, wherein each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers when all main circuit breakers are operational.

### Claim 17 (depends on 4)

The switchyard according to claim 4, wherein each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers when all main circuit breakers are operational.

### Claim 18 (depends on 5)

The switchyard according to claim 5, wherein each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers when all main circuit breakers are operational.

### Claim 19 (depends on 6)

The switchyard according to claim 6, wherein each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers when all main circuit breakers are operational.

### Claim 20 (depends on 7)

The switchyard according to claim 7, wherein each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers when all main circuit breakers are operational.