Schweitzer Engineering Laboratories SEL-311C - Figure 12.5 Derivation of Phasor RMS Current Values from Event Report Current Values

12.26
SEL-311C Relay Instruction Manual Date Code 20060320
Standard Event Reports and SER
Example Standard 15-Cycle Event Report
Figure 12.5 Derivation of Phasor RMS Current Values From Event Report Current Values
= 38.2˚
= Arctan (1531/1945)
Angle = Arctan (Y/X)
Y = 1531
X = 1945
Magnitude =
Y = previous 1/4 cycle
X = present sample
= 2475
(1945)
2
+ (1531)
2
event report column
1945
1531
–1948
–1532
IB
t
1/4 cyc
IB