GE 745 - Page 87

CHAPTER 4: INTERFACES ADVANCED ENERVISTA 745 SETUP FEATURES
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–33
• Currents/voltages:
– I
a
, I
b
, I
c
, I
n
, and I
g
currents for windings 1, 2, and 3
– Positive-, negative-, and zero-sequence currents for windings 1, 2, and 3
– I
a
, I
b
, and I
c
differential and restraint currents
– System frequency
– Frequency decay rate
• Harmonics:
– Total harmonic distortion (THD)
– Harmonic derating factor
• Temperature:
– Ambient temperature
– Hottest-spot winding temperature
– RTDs 1 through 12
• Demand:
– Current demand for Windings 1, 2, and 3
• Others:
– Analog inputs 1, 2, 3, and 4
– Accumulated loss-of-life
–Aging factor
– Tap changer position
 With EnerVista 745 Setup running and communications established,
select the Actual Values > Trending menu item to open the trending
window.
 To prepare for new trending, select Stop to stop the data logger and
Reset to clear the screen.
 Select the graphs to be displayed through the pull-down menu beside
each channel description.
 Select the sample rate through the pull-down menu.