The setting of the
tEF
timer must cover, with sufficient margin, the opening time of
a circuit breaker and the dead-time of a single-phase autoreclosing together with
the breaker closing time.
7.2
Out-of-step protection OOSPPAM
GUID-8321AC72-187C-4E43-A0FC-AAC7829397C3 v1
7.2.1
Identification
GUID-BF2F1533-BA39-48F0-A55C-0B13A393F780 v2
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Out-of-step protection
OOSPPAM
<
78
7.2.2
Application
GUID-11643CF1-4EF5-47F0-B0D4-6715ACEEC8EC v6
Under balanced and stable conditions, a generator operates with a constant rotor
(power) angle, delivering an active electrical power to the power system, which is
equal to the mechanical input power on the generator axis, minus the small losses
in the generator. In the case of a three-phase fault electrically close to the generator,
no active power can be delivered. Almost all mechanical power from the turbine is
under this condition used to accelerate the moving parts, that is, the rotor and the
turbine. If the fault is not cleared quickly, the generator may not remain in
synchronism after the fault has been cleared. If the generator loses synchronism
(Out-of-step) with the rest of the system, pole slipping occurs. This is characterized
by a wild flow of synchronizing power, which reverses in direction twice for every
slip cycle.
The out-of-step phenomenon occurs when a phase opposition occurs periodically
between different parts of a power system. This is often shown in a simplified way
as two equivalent generators connected to each other via an equivalent
transmission line and the phase difference between the equivalent generators is 180
electrical degrees.
Section 7
1MRK 511 407-UEN C
Impedance protection
116
Phasor measurement unit RES670 2.2 IEC
Application manual
Summary of Contents for Relion RES670
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