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Disconnection times on a system if a stand by generator is used

Anthony Smith

On a fully designed power distribution system, clearly the fault levels, earth loop impedances and ultimately fuse disconnection times are determined by the system parameters Transformer %Z etc one or two in parallel for min and max fault levels levels. What needs to be considered when bringing on a stand-by generator, clearly all Fault levels, Earth loop impedances and consequently fuse disconnection times would change because of the Generator parameters. How would you design in these new parameters, bearing in mind that disconnection times on a large system may no longer be achievable 

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    There may be special cases, see BS 9991 and BS 9999, where in a fault (which could be L-N or L-L, and not related to ADS or other methods of protection against electric shock) it's better to keep a generator supply running - but these are special supplies to parts of safety services. And even there, the standards don't say it's acceptable to injure people by electric shock (which could be achieved by other means than ADS), and the measures would be part of wider risk assessments in any case.

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    There may be special cases, see BS 9991 and BS 9999, where in a fault (which could be L-N or L-L, and not related to ADS or other methods of protection against electric shock) it's better to keep a generator supply running - but these are special supplies to parts of safety services. And even there, the standards don't say it's acceptable to injure people by electric shock (which could be achieved by other means than ADS), and the measures would be part of wider risk assessments in any case.

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