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Old 04-03-2010, 06:47 PM   #1
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So does it hold true that each round nodule on high voltage insulators is equivalent to 10K per?
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Old 04-03-2010, 09:16 PM   #2
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So does it hold true that each round nodule on high voltage insulators is equivalent to 10K per?
No, there may be a few out there but the kV/ring depends on class, vintage, manufacturer, shape, and many other factors.

Different utilities in the past used thier own standard voltages and insulator style, so if you know the in and outs of your local grid you will be able to identify the voltage of each line.

Why do you ask?
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Old 04-03-2010, 09:19 PM   #3
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Hey Zog, Is there a rule of thumb what each insulator is good for? Like looking at a high tension line from a distance and knowing what voltage is on the lines?
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Old 04-03-2010, 09:54 PM   #4
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No, there may be a few out there but the kV/ring depends on class, vintage, manufacturer, shape, and many other factors.

Different utilities in the past used thier own standard voltages and insulator style, so if you know the in and outs of your local grid you will be able to identify the voltage of each line.

Why do you ask?
just curious...read that rule of thumb in an old electrical book I have.
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Old 04-03-2010, 10:20 PM   #5
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So does it hold true that each round nodule on high voltage insulators is equivalent to 10K per?
No. The voltage of the line is only a tiny portion of the information used when selecting the number of suspension insulators to use. There's a whole bunch of stuff that goes into the flashover calculation. For instance, there's a 230kv line near me that I count 15 bells on. The only thing that all suspension insulators have in common that has to do with 10kv is that they're tested at 10kv as part of quality control per ANSI 29.
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