The impedance measurement is used for LEXPDIS function. Its operating
characteristic is designed as two zone, offset mho circles and a directional element
restrain line.
7.3.3
Function block
IEC07000031_2_en.vsd
LEXPDIS
I3P*
U3P*
BLOCK
BLKTRZ1
BLKTRZ2
TRIP
TRZ1
TRZ2
START
STZ1
STZ2
XOHM
XPERCENT
ROHM
RPERCENT
IEC07000031 V2 EN
Figure 70:
LEXPDIS function block
7.3.4
Signals
Table 62:
LEXPDIS Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Current group connection
U3P
GROUP
SIGNAL
-
Voltage group connection
BLOCK
BOOLEAN
0
Block of function
BLKTRZ1
BOOLEAN
0
Block trip of zone Z1
BLKTRZ2
BOOLEAN
0
Block trip of zone Z2
Table 63:
LEXPDIS Output signals
Name
Type
Description
TRIP
BOOLEAN
Common trip signal
TRZ1
BOOLEAN
Trip signal from impedance zone Z1
TRZ2
BOOLEAN
Trip signal from impedance zone Z2
START
BOOLEAN
Common start signal
STZ1
BOOLEAN
Start signal from impedance zone Z1
STZ2
BOOLEAN
Start signal from impedance zone Z2
XOHM
REAL
Reactance in Primary Ohms
XPERCENT
REAL
Reactance in percent of Zbase
ROHM
REAL
Resistance in Primary Ohms
RPERCENT
REAL
Resistance in percent of Zbase
Section 7
1MRK 502 048-UEN A
Impedance protection
154
Technical manual
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