Section 7 Impedance Protection; Power Swing Detection Zmrpsb; Identification; Application - ABB RES670 Applications Manual

1MRK 511 407-UEN C
Section 7
7.1
7.1.1
7.1.2
7.1.2.1
Phasor measurement unit RES670 2.2 IEC
Application manual
Impedance protection

Power swing detection ZMRPSB

Identification

Function description
Power swing detection

Application

General

Various changes in power system may cause oscillations of rotating units. The most
typical reasons for these oscillations are big changes in load or changes in power
system configuration caused by different faults and their clearance. As the rotating
masses strive to find a stable operate condition, they oscillate with damped
oscillations until they reach the final stability.
The extent of the oscillations depends on the extent of the disturbances and on the
natural stability of the system.
The oscillation rate depends also on the inertia of the system and on the total
system impedance between different generating units. These oscillations cause
changes in phase and amplitude of the voltage difference between the oscillating
generating units in the power system, which reflects further on in oscillating power
flow between two parts of the system - the power swings from one part to another -
and vice versa.
Distance IEDs located in interconnected networks see these power swings as the
swinging of the measured impedance in relay points. The measured impedance
varies with time along a locus in an impedance plane, see figure 45. This locus can
enter the operating characteristic of a distance protection and cause, if no
preventive measures have been considered, its unwanted operation.
Impedance protection
IEC 61850 IEC 60617
identification identification
ZMRPSB
Zpsb
SYMBOL-EE V1 EN-US
Section 7
IP14499-1 v3
M14853-1 v3
ANSI/IEEE C37.2
device number
68
IP14969-1 v1
M13874-3 v3
107