CHAPTER 4: INTERFACES
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 4–37
When the currents and voltages measured by the relay are zero, the angles displayed by
the relay and those shown by the EnerVista 489 Setup software are not fixed values.
4.6.4 Trending (Data Logger)
The trending or data logger feature is used to sample and record up to eight actual values
at an interval defined by the user. Several 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 EnerVista 489 Setup software are:
• Currents/Voltages:
Phase Currents A, B, and C
Generator Load
Negative-Sequence Current
Ground Current and Neutral Current
Differential Currents A, B, and C
System Frequency
Voltages Vab, Vbc, Vca Van, Vbn & Vcn
• Power:
Power Factor
Real (kW) Reactive (kvar), and Apparent (kVA) Power
Positive Watthours
Positive and Negative Varhours
• Temperature:
Hottest Stator RTD
Thermal Capacity Used
RTDs 1 through 12
• Demand:
Current
Peak Current
Reactive Power
Peak Reactive Power
Apparent Power
Peak Apparent Power
• Others:
Analog Inputs 1, 2, 3, and 4
Tachometer
Courtesy of NationalSwitchgear.com
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