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Installation of a generator for a house.

Tomgunn
Hello all,


I'm moving house, (been here for over 42 years'!!), and one of the first items on my mind is installing an electrical generator.


SO; I guess there will be contactors / switch gear etc as I would like it to be 'automatic', (OR, maybe 'manual' too), changing from incoming to the generator.


a; What would be the best type of generator to purchase? Load wise? I'm not too worried as the bigger the load the bigger the           generator would need to be as long as I could run the basics within the house.


b; What switch gear would be appropriate?


I would't fancy the idea of switching tails around on a Henley block each time I needed the generator to be in use!!


Thanks, in advance!


regards... Tom
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  • 0
     The output impedance of a generator, and so the Zs and PSSC, is a function of the current throttle setting, and in turn varies with the load. It is quite possible to stall a lightly loaded generator without operating any MCBs or fuses. 


    I'm interested in why a lightly loaded genny should have a lower PSSC.

    I would have thought that the instantaneous fault current depended on the inertia which doesn't change with load and the longer term fault current (more than 1 sec) would depend on how much spare capacity was left on the throttle so it would larger for low loads.

    Large UPS systems also have this problem and maybe the answer is to have an undervoltage relay that senses the fall in voltage from a larger fault.


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  • 0
     The output impedance of a generator, and so the Zs and PSSC, is a function of the current throttle setting, and in turn varies with the load. It is quite possible to stall a lightly loaded generator without operating any MCBs or fuses. 


    I'm interested in why a lightly loaded genny should have a lower PSSC.

    I would have thought that the instantaneous fault current depended on the inertia which doesn't change with load and the longer term fault current (more than 1 sec) would depend on how much spare capacity was left on the throttle so it would larger for low loads.

    Large UPS systems also have this problem and maybe the answer is to have an undervoltage relay that senses the fall in voltage from a larger fault.


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