Voltage

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Well i would say just about everything switching ,a lighting strike ,a recloser of a transmission line ,lose connections could yes high resistance to low resistance voltage can change load swing and a swing in a high voltage line just about anything now iam just thinking i maybe wrong ? best to yas
 
I have no scenario. In terms of power quality I just would like to know what to look for if for example I notice a voltage spike reading from test equipment.
 
Jakewhis said:
I have no scenario. In terms of power quality I just would like to know what to look for if for example I notice a voltage spike reading from test equipment.
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Any type of heavy loads starting and stopping at the same time can cause dips/swells. This is very common in the summer during peak hours when a/c useage is high. This is why POCO's use tap changers...which brings me to another point...damaging spikes/swells can be caused by POCO tap changers that malfunction.

Fluke has a forum that deals specifically with PQ that is very informative. Check it out.
 
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Use a 6 V battery to force a current thru an inductor. Open the circuit with current flowing in the inductor. The inductor will generate a voltage large enough to maintain the same current flowing that existed just before the circuit was opened. Theoretically this could be millions of volts. But in reality it may be several thousand volts breaking down the air gap in the switch, or somewhere else.

This is how many automotive ignition systems work.

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I've seen loose connections on inductive(motor) loads that cause current spikes on the pre-ceeding phase, as it tries to pick up and re-gain its correct slip.
 
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