Overview
The mho characteristics can be classified into Offset or Directional. The directional mho characteristics can be set to Offset, Forward or Reverse by the setting parameter DirMode. The offset mho characteristic can be set to Forward or Reverse or Non-Directional.
For more detailed information, refer to ABB, Relion 670 Series manuals.
To see other supported elements click here.
ZMHPDIS Identification
| Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
| Full-scheme distance protection, mho characteristic | ZMHPDIS | Z< | 21 |
Signals & Setting Parameters
ZMHPDIS function block
ZMHPDIS Input signals
| ZMHPDIS Input signals | |||
| Name | Type | Default | Description |
| I3P | GROUP SIGNAL | – | Connection for current sample signals |
| U3P | 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 |
| BLKTRIP | BOOLEAN | 0 | Blocks all operate output signals |
| BLKPE | BOOLEAN | 0 | Blocks phase-to-earth operation |
| BLKPP | BOOLEAN | 0 | Blocks phase-to-phase operation |
| EXTNST | BOOLEAN | 0 | External start |
| INTRNST | BOOLEAN | 0 | Internal start |
| DIRCND | INTEGER | 0 | External directional condition |
| STCND | INTEGER | 0 | External start condition (loop enabler) |
| LDCND | INTEGER | 0 | External load condition (loop enabler) |
ZMHPDIS Output signals
| ZMHPDIS Output signals | |||
| Name | Type | Description | |
| TRIP | BOOLEAN | Trip General | |
| TRL1 | BOOLEAN | Trip phase L1 | |
| TRL2 | BOOLEAN | Trip phase L2 | |
| TRL3 | BOOLEAN | Trip phase L3 | |
| TRPE | BOOLEAN | Trip phase-to-earth | |
| TRPP | BOOLEAN | Trip phase-to-phase | |
| START | BOOLEAN | Start General | |
| STL1 | BOOLEAN | Start phase L1 | |
| STL2 | BOOLEAN | Start phase L2 | |
| STL3 | BOOLEAN | Start phase L3 | |
| STPE | BOOLEAN | Start phase-to-earth | |
| STPP | BOOLEAN | Start phase-to-phase | |
| STTIMER | BOOLEAN | Start timer | |
ZMHPDIS Group settings (basic)
| ZMHPDIS Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off/On |
| DirMode | Off Offset Forward Reverse |
– | – | Forward | Direction mode |
| LoadEncMode | Off On |
– | – | Off | Load encroachment mode Off/On |
| ReachMode | Overreach Underreach |
– | – | Overreach | Reach mode Over/Underreach |
| ZnTimerSel | Timers seperated Timers linked Internal start Start from PhSel External start |
– | – | Timers seperated | Zone timer selection |
| OpModePE | Off On |
– | – | On | Operation mode Off / On of Phase- Earth loops |
| ZPE | 0.005 – 3000.000 | Ohm/p | 0.001 | 30.000 | Positive sequence impedance setting for Phase-Earth loop |
| ZAngPE | 10 – 90 | Deg | 1 | 85 | Angle for positive sequence line impedance for Phase-Earth loop |
| KN | 0.00 – 3.00 | – | 0.01 | 0.80 | Magnitude of earth return compensation factor KN |
| KNAng | -180 – 180 | Deg | 1 | -15 | Angle for earth return compensation factor KN |
| ZRevPE | 0.005 – 3000.000 | Ohm/p | 0.001 | 30.000 | Reverse reach of the phase to earth loop(magnitude) |
| tPE | 0.000 – 60.000 | s | 0.001 | 0.000 | Delay time for operation of phase to earth elements |
| IMinOpPE | 10 – 30 | %IB | 1 | 20 | Minimum operation phase to earth current |
| OpModePP | Off On |
– | – | On | Operation mode Off / On of Phase- Phase loops |
| ZPP | 0.005 – 3000.000 | Ohm/p | 0.001 | 30.000 | Impedance setting reach for phase to phase elements |
| ZAngPP | 10 – 90 | Deg | 1 | 85 | Angle for positive sequence line impedance for Phase-Phase elements |
| ZRevPP | 0.005 – 3000.000 | Ohm/p | 0.001 | 30.000 | Reverse reach of the phase to phase loop(magnitude) |
| tPP | 0.000 – 60.000 | s | 0.001 | 0.000 | Delay time for operation of phase to phase |
| IMinOpPP | 10 – 30 | %IB | 1 | 20 | Minimum operation phase to phase current |
ZMHPDIS Group settings (advanced)
| ZMHPDIS Group settings (advanced) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| OffsetMhoDir | Non-directional Forward Reverse |
– | – | Non-directional | Direction mode for offset mho |
| OpModetPE | Off On |
– | – | On | Operation mode Off / On of Zone timer, Ph-E |
| OpModetPP | Off On |
– | – | On | Operation mode Off / On of Zone timer, Ph-ph |
ZMHPDIS Non group settings (basic)
| ZMHPDIS Non group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| GlobalBaseSel | 1 – 12 | – | 1 | 1 | Selection of one of the Global Base Value groups |
Logics & highlights
Load encroachment influence on the offset mho characteristic
Mho, offset mho characteristic and the source impedance influence on the mho characteristic
Simplified mho characteristic and vector diagram for phase L1-to-L2 fault
Simplified offset mho characteristic and voltage vectors for phase L1-to-L2 fault
Simplified offset mho characteristic in forward direction for phase L1-to-L2 fault
Operation characteristic for reverse phase L1-to-L2 fault
Simplified mho characteristic and vector diagram for phase L1-to- earth fault
Simplified offset mho characteristic and voltage vector for phase L1-to- earth fault
Simplified characteristic for offset mho in forward direction for L1-to-earth fault
Simplified characteristic for offset mho in reverse direction for L1-to-earth fault
Simplified logic for release start signal
Composition of starting signals
Tripping logic for the distance protection zone
Zone timer logic
