Trace UL and stupidity [RE-wrenches]

[Drake Chamberlin - Electrical Energy]

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Wrenches,


These inverters have been getting installed on grid interactive systems for 
years.  Have there been any problems?  (Trace-Xantrex doesn't seem to think 
so).  Have any linemen been hurt?  Don't the standard safety procedures of 
grounding power lines, before working on them, negate any potential 
islanding hazard?

The required, lockable utility disconnect switch is supposed to be a fail 
safe against any problems resulting from the possibility that an inverter 
might not de energize when the grid goes down.  They are theoretically 
required as a remedy for this specific issue.  Isn't this a simple 
mechanical solution, implemented specifically to address this potential hazard?

Does anyone know how long an inverter can island under perfect, f"balanced 
load" conditions?  How long are such conditions likely to last in real 
installations?

Thanks,

Drake

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