7.2.6
Monitored data
PID-3539-MONITOREDDATA v8
Table 89:
OOSPPAM (78) Monitored data
Name
Type
Values (Range)
Unit
Description
CURRENT
REAL
-
A
Magnitude of the measured
positive-sequence current, in
A
VOLTAGE
REAL
-
kV
Magnitude of the measured
positive-sequence voltage, in
V
R
REAL
-
%
Real part of measured
positive-sequence impedance
% of VBase/(sqrt(3)*IBase)
X
REAL
-
%
Imaginary part of measured
positive-seq impedance % of
VBase/(sqrt(3)*IBase)
SLIPFREQ
REAL
-
Hz
Slip frequency in Hz
ROTORANG
REAL
-
deg
Rotor angle as estimated by
the out-of-step function
VCOSPHI
REAL
-
kV
Estimated Ucos(Phi) voltage
during pole slip, in V
7.2.7
Operation principle
GUID-787EEB01-B760-4D4B-AB4E-1DCD6ABFFF5E v6
General
Under balanced and stable conditions, a generator operates with a constant rotor angle
(power angle), delivering active electrical power to the power system, which is
approximately equal to the input mechanical power on the generator axis.The currents
and voltages are constant and stable. An out-of-step condition is characterized by
periodic changes in the rotor angle, that leads to a wild flow of the synchronizing
power; so there are also periodic changes of rotational speed, currents and voltages.
When displayed in the complex impedance plane, these changes are characterized by a
cyclic change in the complex load impedance Z(R, X) as measured at the terminals of
the generator, or at the location of the instrument transformers of a power line
connecting two power subsystems. This is shown in
Section 7
1MRK 511 408-UUS A
Impedance protection
158
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Summary of Contents for Relion RES670
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