prov:value
| - See, e.g., U.S. Pat. No. 5,648,888, Jul. 15, 1997, titled Power Distribution Substation, for background information regarding such substations.) For example, separate devices have been used to monitor a power system to determine when an event, such as loss of power, reduction in supplied voltage, distortion of the voltage or current waveform, or the like, has occurred on the system.
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