Monitored Data - ABB REG650 Technical Manual

1MRK 502 043-UUS B
7.3.6
7.3.7
Technical Manual

Monitored data

Table 59: OOSPPAM (78) Monitored data
Name Type
VOLTAGE REAL
CURRENT REAL
R REAL
X REAL
ROTORANG REAL
VCOSPHI REAL
Operation principle
General
Under balanced and stable conditions, a generator operates with a constant rotor angle
(power angle), delivering to the power system active electrical power which is
approximately equal to the mechanical input 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 is, the synchronizing power, 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 terminals of a power line connecting two
power sub-systems. This is shown in
Impedance protection
Values (Range) Unit
- kV
- A
- Ohm
- Ohm
- deg
- kV
Figure 68.
Section 7
Description
Magnitude of the measured
positive-sequence voltage, in
V
Magnitude of the measured
positive-sequence current, in
A
Real part of measured
positive-sequence impedance
% of VBase/(sqrt(3)*IBase)
Imaginary part of measured
positive-seq impedance % of
VBase/(sqrt(3)*IBase)
Rotor angle as estimated by
the out-of-step function
Estimated Ucos(Phi) voltage
during pole slip, in V
151