SEQ_COMPONENTS
Symmetrical components from three phasors — positive, negative and zero sequence, with unbalance ratios and phase-rotation detection.
When to use it
Use SEQ_COMPONENTS when three-phase voltages are available as magnitude AND angle and the scheme needs the unbalance a generator actually feels — negative-sequence heating, a zero-sequence indication of an earth path, or proof that phase rotation is A-B-C before a set is paralleled.
Interface
The published port signature. This is the whole of what the block exposes to your program — the implementation body is not shown here and ships with the download.
Inputs
| Port | Type | Unit |
|---|---|---|
| VA | REAL | V |
| VB | REAL | V |
| VC | REAL | V |
| VA_ANG_DEG | REAL | deg |
| VB_ANG_DEG | REAL | deg |
| VC_ANG_DEG | REAL | deg |
| MEAS_OK | BOOL | — |
| V_NOM_LN | REAL | V |
| RATIO_MIN_PCT | REAL | % |
| UNBAL_LIM_PCT | REAL | % |
| UNBAL_DLY | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| V1 | REAL | V |
| V2 | REAL | V |
| V0 | REAL | V |
| V1_ANG_DEG | REAL | deg |
| V2_PCT | REAL | % |
| V0_PCT | REAL | % |
| PHASE_ROT_ABC | BOOL | — |
| VALID | BOOL | — |
| PCT_VALID | BOOL | — |
| ROT_VALID | BOOL | — |
| ALM_UNBAL | BOOL | — |
| ALM_ROT_REV | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 7
- Simulated scans
- 111
- Simulator
- v0.1.0
Complete IEC 61131-3 implementation with a published test suite that runs on the vplant simulator. The counts above are that suite, executed on this build.
- Conforms to IEC 61131-3
- Conforms to IEC 61499
Download SEQ_COMPONENTS — free
Create a free Ri Tech account to download the block. You get the Structured Text body, the Rockwell Add-On Instruction (.L5X), the Schneider Control Expert DFB (.XDB), PLCopen XML, the IEC 61499 function block type (.fbt) and the datasheet.
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Source is never published on this page. The implementation is released to a signed-in Ri Tech account — free of charge, but never anonymously.