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1
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Mbrooke
Electrical
- Nov 12, 2012
- 2,546
An educational lesson from the 136th Protection Sub-Committee Meeting where a kite string resulted in the loss of five 400kv transmission lines, two compensation reactors, and three interconnecting auto transformers where at most only 4 elements would have cleared.
I think this is worth bringing into the engineering and design arena as a serious discussion in that all to often busbars end up being so physically close to each other such that an event on one results in others being effected- the most notable resulting in the 2003 Denmark Sweden Blackout.
Starting on page 9. Other cases of total voltage level clearing also documented.
Regarding the Denmark Sweden blackout, a pentograph disconnect on bus A failed drawing an arc which evolved into a two phase fault involving closely adjacent bus B clearing the entire station interrupting a vital flow path which ultimately resulted in 5 million customer losing power.
With this said please leave space between bars, at least that of the width of a whole set, or the maximum distance which a protracted fault can reach before having the ability to evolve into another zone of protection. In addition to taking work space into consideration, where a grounded bus can be serviced without violating work distances between equipment/persons and energized parts.
I think this is worth bringing into the engineering and design arena as a serious discussion in that all to often busbars end up being so physically close to each other such that an event on one results in others being effected- the most notable resulting in the 2003 Denmark Sweden Blackout.
Starting on page 9. Other cases of total voltage level clearing also documented.



Regarding the Denmark Sweden blackout, a pentograph disconnect on bus A failed drawing an arc which evolved into a two phase fault involving closely adjacent bus B clearing the entire station interrupting a vital flow path which ultimately resulted in 5 million customer losing power.

With this said please leave space between bars, at least that of the width of a whole set, or the maximum distance which a protracted fault can reach before having the ability to evolve into another zone of protection. In addition to taking work space into consideration, where a grounded bus can be serviced without violating work distances between equipment/persons and energized parts.