ARC FLASH ANALYSIS ON A WINDFARM

This project involved an arc flash risk assessment on a 15MW wind farm in Ireland’s midlands. The wind farm was made up of five 3MW turbines. This arc flash project was the first of its kind for the client involved, who manage and operate 1500MW on onshore wind capacity across Ireland and the UK.

INDUSTRY SUCCESS

Renewable electricity accounts for

66

of renewable energy

Wind accounts for

85

of renewable electricity

By 2020

16

of energy consumption must be from renewables

THE CHALLENGE

This study was used to identify potential arc flash risk when electrical operatives manually switched and/or isolating the wind turbines from the distribution system. The project was used to assess the potential arc flash risk at the 15MW wind farms 20KV and 690V equipment. The wind energy convertors (WEC’s) on site generated power at 690V. The wind power generated by the turbines was then stepped up and exported to the distribution network at 20kV. The challenge here was to take into account multiple network feeding arrangements and the WEC’s contribution to the sites overall prospective arc incident energy levels.

HOW WE HELPED

Using an advanced power systems software package, SKM, the wind farm’s electrical network was modelled and scenario analysis was performed to simulate the worst case arc incident energy levels on site. Due to the nature of the network, significant time was spent reconfiguring the electrical model to ensure all potential network feeding arrangements were captured. Scenario analysis was imperative in identifying the worst case arc flash risk to electrical operatives.

THE RESULT

Arc flash hazard analysis demonstrated that there were several locations on site that were considered to be extremely dangerous. Due to the limited settings available on the WEC TXFR supply relay the high prospective arc incident energies could not be mitigated against through protection setting adjustments. Because protective setting adjustments could not be implemented, alternative control measures were recommended. This included remote switching and isolating the LV equipment through the upstream MV circuit breakers.

THE CLIENT

The company operating this wind farm is involved in the generation, transmission, distribution and supply of electricity across Ireland and UK. They employ 20,000 people across their business platforms.

"The results from this study showed that the risk to electrical operatives is as great on windfarms as it is in large manufacturing facilities. This was witnessed through the high prospective arc incident energies found at both MV and LV distribution levels."

George MoklElectrical Engineer

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