9.19
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Reporting
Event Reports, Event Summaries, and Event Histories
Step 2. Calculate the immediate phase angle.
a. Select the same cycle of data from the IA column of the event
report as you did when finding the magnitude (Cycle [1] data for
this example).
b. Compute phasor angle using the following expression:
Equation 9.2
In Equation 9.2, Y is the first (or previous value) IA column
current of a data pair, and X is the present value of the pair.
For this example, the computation shown in Figure 9.8 yields
–105.9 degrees.
c. Compute phasor angles from the remaining data pairs for Cycle [1].
arctan
Y
X
----
Phasor==
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