ABB Relion 670 series, Руководство по применению, Страница: 377 / 760

then it is necessary to set the load argument in FDPSPDIS or FRPSPDIS function to not less
than equation 444 .
( ) ( )
tan tan 25
arc tan arc tan 37.5
0.61
é ù é ù °
³ = = °
ê ú ê ú
ë û ë û
PSD
PHS
ArgLd
ArgLd
kLdRFw
EQUATION1355 V1 EN-US
(Equation 444)
It is recommended to set the corresponding resistive reach parameters in reverse direction
(
RLdOutRv and kLdRRv) to the same values as in forward direction, unless the system
operating conditions, which dictate motoring and generating types of oscillations, requires
different values. This decision must be made on basis of possible system contingency studies
especially in cases, when the direction of transmitted power may change fast in short periods
of time. It is recommended to use different setting groups for operating conditions, which are
changing only between different periods of year (summer, winter).
System studies should determine the settings for the hold timer tH. The purpose of this timer
is, to secure continuous output signal from Power swing detection function (ZMRPSB) during
the power swing, even after the transient impedance leaves ZMRPSB operating characteristic
and is expected to return within a certain time due to continuous swinging. Consider the
minimum possible speed of power swinging in a particular system.
The
tR1 inhibit timer delays the influence of the detected residual current on the inhibit criteria
for ZMRPSB. It prevents operation of the function for short transients in the residual current
measured by the IED.
The
tR2 inhibit timer disables the output START signal from ZMRPSB function, if the measured
impedance remains within ZMRPSB operating area for a time longer than the set
tR2 value.
This time delay was usually set to approximately two seconds in older power-swing devices.
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.
7.15 Power swing logic PSLPSCH
SEMOD153597-1 v3
7.15.1 Identification
SEMOD175682-2 v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Power swing logic PSLPSCH - -
7.15.2 Application
SEMOD131359-4 v3
Power Swing Logic (PSLPSCH) is a complementary function to Power Swing Detection
(ZMRPSB) function. It enables a reliable fault clearing for different faults on protected lines
during power swings in power systems.
It is a general goal, to secure fast and selective operation of the distance protection scheme
for the faults, which occur on power lines during power swings. It is possible to distinguish
between the following main cases:
1MRK 505 343-UEN B Section 7
Impedance protection
371
Application manual