From lab to track: substation communication technology to help protect new metro line in China

2015-12-15 - Innovative ABB technology to detect multiple faults has been adopted on a new metro line in Ningbo, China. Initial results have shown a major improvement in the reliability and stability of the power supply in the metro grid.

The Ningbo Metro Line 2 is currently in its test run and is expected to be operational by the end of the year. Ultimately it will have 22 stations connecting to the other metro lines in the Ningbo Rail Transit System and the city’s railway station and airport. The metro line will provide transportation service to about 1.5 million commuters.

Line 2 will run with the support of innovative ABB substation communication technology, which ABB has spent two years developing and simulation-testing and this is its first deployment. This communication technology, which is fully based on the IEC 61850 protocol standard, supports network protection and control and allows significantly shortened fault discovery times and faster recovery periods, and ultimately a more reliable train service for passengers.

Known as a smart selective trip solution, the technology went live on Line 2 in March this year, subsequently passing primary short-circuit fault simulation tests. Results have shown a major improvement in the reliability and stability of the power supply in the metro grid. Its successful implementation could eventually serve as a good reference for other metro lines and lead to the technology's wider use in other segments such as the power distribution network and industries.

Mastering the complexity of modern metro grids

The smart selective trip solution combines ABB's ZX2 40.5-kilovolt gas-insulated switchgear and REF620 relay with GOOSE-based communication technology. GOOSE (Generic Object Oriented Substation Events) is part of the IEC 61850 standard and uses Ethernet-based object-oriented communication technology for substation automation.

Under traditional setups, protection and control relays in substations could only communicate by hard-wired connections in linear sequence – a process that is not only time-consuming but also insufficient for handling multiple faults in increasingly complex modern metro grids. In contrast, the GOOSE-enabled smart selective trip function equips these relays with peer-to-peer information sharing on demand, leading to significantly shortened fault discovery times. Multiple faults in the power system are also detected with no dead zone, thus leading to faster recovery periods.

Located about 200 kilometers south of Shanghai, Ningbo is the second largest city in Zhejiang Province and has a history as a city of trade and transport. Known as a trade city on the Silk Road at least two thousand years ago, and then as a major port, it is now an important transportation and logistics hub in the Yangtze River Delta area. The new railway line is another modern addition to this heritage and it is being enhanced by ABB’s latest innovation in railway substation communication technology.

    •   Cancel
      • Twitter
      • Facebook
      • LinkedIn
      • Weibo
      • Print
      • Email
    •   Cancel
    seitp202 8e8717ad6350e7efc1257f01003eac2f