•
Operation: With the setting Operation OOSPPAM function can be set On/Off.
•
OperationZ1: Operation zone 1 On, Off. If OperationZ1 = Off, all pole-slips with centre of
the electromechanical oscillation within zone 1 are ignored. Default setting =
On. More
likely to be used is the option to extend zone 1 so that zone 1 even covers zone 2. This
feature is activated by the input to extend the zone 1 (EXTZ1).
•
OperationZ2: Operation zone 2 On, Off. If OperationZ1 = Off, all pole-slips with centre of
the electromechanical oscillation within zone 2 are ignored. Default setting =
On.
•
tBreaker: Circuit breaker opening time. Use the default value tBreaker = 0.000 s if
unknown. If the value is known, then a value higher than 0.000 is specified, for example
tBreaker = 0.040 s: the out-of-step function gives a trip command approximately 0.040
seconds before the currents reach their minimum value. This in order to decrease the
stress imposed to the circuit breaker.
•
GlobalBaseSel: This setting identifies the Global Base Values Group where UBase and
IBase are defined. In particular: UBase is the voltage at the point where the Out-of-step
protection is connected. If the protection is connected to the generator output terminals,
then
UBase is the nominal (rated) phase to phase voltage of the protected generator. All
the resistances and reactances are measured and displayed referred to voltage
Ubase.
Observe that
ReverseX, ForwardX, ReverseR, and ForwardR must be given referred to
UBase.IBase is the protected generator nominal (rated) current, if the Out-of-step
protection belongs to a generator protection scheme.
•
InvertCTCurr: If the currents fed to the Out-of-step protection are measured on the
protected generator neutral side (LV-side) then inversion is not necessary (
InvertCTCurr =
Off), provided that the CT’s star point earthing complies with ABB recommendations, as it
is shown in Table
. If the currents fed to the Out-of-step protection are measured on the
protected generator terminals side, then invertion is necessary (
InvertCTCurr = On),
provided that the CT’s star point earthing complies with ABB recommendations, as it is
shown in Table
.
7.18
Automatic switch onto fault logic ZCVPSOF
SEMOD153633-1 v3
7.18.1
Identification
SEMOD155890-2 v4
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Automatic switch onto fault logic
ZCVPSOF
-
-
7.18.2
Application
M13830-3 v5
Automatic switch onto fault logic, voltage- and current-based function ZCVPSOF is a
complementary function to impedance measuring functions, but may use the information
from such functions.
With ZCVPSOF, a fast trip is achieved for a fault on the whole line when the line is being
energized. The ZCVPSOF tripping is generally non-directional to secure a trip at fault
situations where directional information cannot be established, for example, due to lack of
polarizing voltage when a line potential transformer is used.
Automatic activation based on dead-line detection can only be used when the voltage
transformer is situated on the line side of a circuit breaker.
When line side voltage transformers are used, the use of the nondirectional distance zones
secures switch onto fault tripping for close-in three-phase short circuits. The use of the
Section 7
1MRK 505 343-UEN B
Impedance protection
394
Application manual
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