davezawadi (David Stone):
If you really think that there are 2 options: one is a much larger generator than you need, say 1MVA for a 100 kVA supply. This is very expensive. The second option is to understand that the likely risk of supply failure is very small, much less than a fault at the same time. This means that having any supply is better than nothing, so you accept that a fault could occur but is very unlikely. Simple risk assessment to use the modern term. If an MCB fails to open what is the risk? Very small as the power available is also small. This is very important to understand.
Do you really want to black out a building or hospital because of a fault in single 16 amp circuit due to a light fixture?
I'm thinking that with knowing the behavior of the alternator and engine some basic equations can lead to sizing the circuits such that a fault will not clear the generator.
davezawadi (David Stone):
If you really think that there are 2 options: one is a much larger generator than you need, say 1MVA for a 100 kVA supply. This is very expensive. The second option is to understand that the likely risk of supply failure is very small, much less than a fault at the same time. This means that having any supply is better than nothing, so you accept that a fault could occur but is very unlikely. Simple risk assessment to use the modern term. If an MCB fails to open what is the risk? Very small as the power available is also small. This is very important to understand.
Do you really want to black out a building or hospital because of a fault in single 16 amp circuit due to a light fixture?
I'm thinking that with knowing the behavior of the alternator and engine some basic equations can lead to sizing the circuits such that a fault will not clear the generator.
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