By Xu Z., Yang X.
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Among 1993 and 2000, a chain of groundbreaking experiments published dramatic proof of an internet of strength that connects every thing in our lives and our world—the Divine Matrix. From the therapeutic of bodies, to the good fortune of our careers, relationships, and the peace among international locations, this new facts demonstrates that we every one carry the ability to talk on to the strength that hyperlinks all of construction.
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Note that if the fault is still there and lies beyond the pulled back-reach, then tripping cannot be initiated at that terminal unless a form of backup protection is applied to remove the fault. For a fault that occurs beyond the remote terminal but within reach of the extended Zone 1 reach, all line sections adjacent to the fault (and utilizing this scheme) will be tripped. However, this will cause the reach to be pulled back so that when the breaker is reclosed, the fault (if it still exists) will be beyond the pulled back reach so that automatic reclosing will be successful.
In some applications, these relays may be applied only at the terminal with the higher fault current source. Copyright © 2000 IEEE. All rights reserved. 2 - Time overcurrent curve shape comparison Figure 24—Time overcurrent curve shape comparison In a few cases, nondirectional overcurrent relays can be applied on long transmission lines. On such lines, the contribution of fault current to faults in the reverse direction (behind the terminal) is limited by the impedance of the long line. Also, in the forward direction, close-in faults are much higher in magnitude than faults beyond the remote terminal.
Then, the line will still be energized by this source; however, no appreciable current can flow due to the delta transformer winding. The delta will remain a source of positive and negative-sequence current flow if the ground source remains on the line (such as a wye grounded/delta transformer tapped to the line) after the main transmission line terminals open. The positive and negative-sequence source of backfeed must be eliminated for multiphase faults and for single line-to-ground faults to ensure arc extinction.