Scalable switchyard for interconnecting direct current power networks

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.