Siemens Siprotec 7UM611 Manual page 184

Multi-functional generator protection relay 7um61 series
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2 Functions
184
Measured Value
I0
I0/I
N,sec
(Zero sequence
current system)
I1
I1/I
N,sec
(Positive sequence
current system)
I2
I2/I
N,sec
(Negative sequence
current system)
ϕ
ϕ/180° · 100 %
(Power angle)
Scaling
· 100 %
The zero sequence current is determined
from the phase currents on the basis of the
definition equation for symmetrical compo-
nents. The calculation is performed once per
cycle.
· 100 %
The positive sequence current is determined
from the phase currents on the basis of the
definition equation for symmetrical compo-
nents. The calculation is performed once per
cycle.
· 100 %
The negative sequence current is determined
from the phase currents on the basis of the
definition equation for symmetrical compo-
nents. The calculation is performed once per
cycle.
The power angle is calculated from the posi-
tive sequence voltage and the positive se-
quence current. The following definition ap-
plies:
ϕ = ϕU - ϕI (A positive angle will appear if the
current lags behind the voltage)
Explanation
7UM61 Manual
C53000-G1176-C127-3

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