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A light shines where there was none
On Thu, 11 Sep 2003 12:23:38 GMT, Roland Perry wrote:
In message , Chris Game writes If the line went into overload protection at a fraction of what it should have done, a simple test of the line during commissioning (at 50% of rating) would have shown this. I wonder how you test 2500 amp circuits on load when a large section of south London only draws half of that. What's the dummy-load going to look like? You don't need 275,000v to inject a test current through the current transformers. Protection testing is done at both primary and secondary levels. A primary injection set may produce lots of amps, but at a relatively low voltage. Testing on the secondary side only uses a few amps. |
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