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6.7
Power swing detection ZMRPSB (68)
6.7.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Power swing detection
ZMRPSB
Zpsb
SYMBOL-EE V1 EN
68
6.7.2
Functionality
Power swings may occur after disconnection of heavy loads, upon severe fault clearing or
after tripping of big generation plants.
Power swing detection function ZMRPSB (68) is used to detect power swings and initiate
block of all distance protection zones. Occurrence of ground-fault currents during a power
swing inhibits the ZMRPSB (68) function to allow fault clearance.
6.7.3
Function block
ANSI09000058-1-en.vsd
ZMRPSB (68)
I3P*
V3P*
BLOCK
BLK_SS
BLK_I0
I0CHECK
EXT_PSD
PICKUP
ZOUT
ZIN
ANSI09000058 V1 EN
Figure 82:
ZMRPSB (78) function block
6.7.4
Signals
Table 60:
ZMRPSB (68) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase group signal for current inputs
U3P
GROUP
SIGNAL
-
Three phase group signal for voltage inputs
BLOCK
BOOLEAN
0
Block of function
Table continues on next page
1MRK 506 335-UUS A
Section 6
Impedance protection
175
Technical manual
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