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Monitoring system Office complex load
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Figure 1135 All capacitors are upstream from the monitoring location Therefore, the
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answer module should report upstream capacitor switching when such an event is captured
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Figure 1136 The output of the capacitor-switching answer module for the one-line diagram presented in Fig 1135
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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change is then compared to the actual or physical capacitor bank kvar supplied by a user If the expected kvar was not realized, the capacitor bank or its switching device may be having some problems Figure 1137 shows the application of the capacitor-switching operation inspector expert system in a commercial monitoring system The monitoring location is at the substation; thus, all capacitor banks along the feeders are downstream from the monitoring location The first capacitor-switching event indicates that two phases of the capacitor are out of service Either the fuses have blown or the switch is malfunctioning The second event shows a successful capacitor-switching operation
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Lightning correlation module The majority of voltage sags and outages
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in the United States are attributed to weather-related conditions such as thunderstorms For example, TVA has approximately 17,000 mi of transmission lines where lightning accounts for as much as 45 percent of the faults on their system The lightning correlation expert system module is designed to correlate lightning strikes with measured power quality events and make that information available in real time directly at the point of measurement Armed with the correlation results, engineers can evaluate the cause and impact of voltage sags for a specific customer at a specific monitoring point as well as evaluate the impact on all customers for a given event When the lightning correlation module detects a voltage sag or transient event, it queries a lightning database via the Internet The lightning data are provided by the US National Lightning Detection Network operated by Global Atmospherics, Inc If the query returns a result set, the lightning correlation module will store this information in the monitoring system database along with the disturbance data for information dissemination The lightning data include the event time of the strike, the latitude and longitude of strike location, the current magnitude, and number of strokes
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Figure 1137 Analysis results of the capacitor-switching inspector expert system
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Power Quality Monitoring 510 Eleven
The following example illustrates how the module performs its function On Easter Sunday, March 31, 2002, in Knoxville, Tennessee, the location of the Electrotek Concepts primary engineering office, thunderstorms moved through the area around 11:00 AM Figure 1138 shows the four lightning strikes in the Cedar Bluff area of Knoxville The office complex, marked as Electrotek, has a data acquisition node at the service entrance Another data acquisition node marked as Cedar Bluff Substation is connected at the 161/13-kV transformer on the 13-kV side at the substation that feeds the Electrotek office about 1 2 mi away During the time of the storm, the power monitoring system captured a number of events The strikes shown in Fig 1138 were all within several kilometers of the substation and are located directly on known distribution system right of way Specifically, there were two events that correlated within 100 ms of lightning strikes during the storm as shown in the output of the lightning correlation module in Fig 1139 Lightning strike data are summarized in Table 114
Figure 1138 Lightning strikes near a substation serving the Electrotek office on Easter
Sunday morning in 2002
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Power Quality Monitoring Power Quality Monitoring 511
Figure 1139 Outputs of the lightning correlation expert system module
TABLE 114
Lightning Stroke Data Mag Distance (kA) (km) Strokes 58 132 62 42 32 10 10 14 14 42 22 8 12 18 6 678 3 638 649 600 612 623 627 587 633 5 2 632 10 1 2 1 2 1 1 1 1 1 1 2 1 3
Time stamp 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002 3/31/2002
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