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3-12 489 Generator Management Relay GE Multilin
3.2 SOFTWARE INTERFACE 3 USER INTERFACES
3
3.2.5 TRENDING
Trending from the 489 can be accomplished via the 489PC program. Many different parameters can be trended and
graphed at sampling periods ranging from 1 second up to 1 hour.
The parameters which can be Trended by the 489PC software are:
Currents/Voltages: Phase Currents A, B, and C Neutral Currents A, B, and C
Generator Load Negative Sequence Current
Ground Current Differential Currents A, B, and C
System Frequency Voltages Vab, Vbc, Vca Van, Vbn, and Vcn
Volts/Hz Neutral Voltage (fundamental)
Neutral Voltage (3
rd
harmonic) Terminal Voltage (3
rd
harmonic)
Power: Power Factor Real Power (MW)
Reactive Power (Mvar) Apparent Power (MVA)
Positive Watthours Positive Varhours
Negative Varhours
Temperature: Hottest Stator RTD Thermal Capacity Used
RTDs 1 through 12
Others: Analog Inputs 1, 2, 3, and 4 Tachometer
1. With the 489PC running and communications established, select the Actual > Trending menu item to open the trending
window.
2. Click Setup to enter the Graph Attribute page.
3. Select the graphs to be displayed with the pull-down menus beside each Description. Change the Color, Style, Width,
Group#, and Spline sections as desired. Select the same Group# to scale all parameters together.
4. Click Save to store the graph attributes and OK to close the window.
Figure 3–5: GRAPH ATTRIBUTE WINDOW – TRENDING