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Always powerlines. But it takes a visitor to remind me that Europeans wisely place all powerlines undergound and are therefore not accustomed to weather and other related power outages. Thanks Gabi.
HVDC Staged Line Fault On Ben-Hay-1
The pole 2 commissioning is coming to a very near end, so the time has come to start testing the way the poles react to line faults.
Using a pengalime attached to the tower, an electric fence wire is shorted from the tower to the live conductor.
This is done with the line at full voltage 350,000 Volts Direct Current and transferring about 350 Mega watts to the north (Benmore to Haywards)
This particular test, pole 3 was tripped and pole 2 took up the tripped value to keep the DC link running at around 700 Mega Watts. The short fault period carried about 6000 amps to ground but for only a few mille seconds..
Also part of this test is to check the function of the DC line Fault Locator. This equipment is capable of detecting a line fault and displaying a trace on a computer screen, giving the exact location of where the fault occurred. This is possible due to a GPS system and some sophisticated mathematics that detect the fault wave fronts from each end of the line.
The 138kv pass over the substation. This is the substation for the small town of Milton, LA. Notice the lean on the high line tower. All of the poles on this line lean in that direction.