The full scheme technique provides back-up protection of power lines with high sensitivity and low
requirement on remote end communication.
The zones have fully independent measuring and settings, which gives high flexibility for all types
of lines.
Built-in selectable zone timer logic is also provided in the function.
The function can be used as under impedance back-up protection for transformers and
generators.
7.3.3 Function block
SEMOD154705-4 v4
ZMHPDIS (21)
I3P*
V3P*
CURR_INP*
VOLT_INP*
POL_VOLT*
BLOCK
BLKZ
BLKZMTD
BLKHSIR
BLKTRIP
BLKPG
BLKPP
EXTNST
INTRNST
DIRCND
PHSEL*
LDCND
TRIP
TR_A
TR_B
TR_C
TRPG
TRPP
PICKUP
PU_A
PU_B
PU_C
PHG_FLT
PHPH_FLT
PU_TIMER
ANSI06000423-2-en.vsd
ANSI06000423 V2 EN-US
Figure 97: ZMHPDIS (21) function block
7.3.4 Signals
SEMOD154579-1 v2
PID-3552-INPUTSIGNALS v6
Table 99: ZMHPDIS (21) Input signals
Name Type Default Description
I3P GROUP
SIGNAL
- Connection for current sample signals
V3P GROUP
SIGNAL
- Connection for voltage sample signals
CURR_INP GROUP
SIGNAL
- Connection for current signals
VOLT_INP GROUP
SIGNAL
- Connection for voltage signals
POL_VOLT GROUP
SIGNAL
- Connection for polarizing voltage
BLOCK BOOLEAN 0 Block of function
BLKZ BOOLEAN 0 Block due to fuse failure
BLKZMTD BOOLEAN 0 Block signal for blocking of time domaine function
BLKHSIR BOOLEAN 0 Blocks time domain function at high SIR
Table continues on next page
Section 7 1MRK 502 066-UUS B
Impedance protection
216
Technical manual
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