SIP_7UT_TRF
SIPROTEC-shaped two-winding transformer differential characteristic (ANSI 87T): per-phase dual-slope percentage restraint, an unrestrained high set, and second- and fifth-harmonic restraint for inrush and over-excitation.
When to use it
Use SIP_7UT_TRF when a two-winding transformer's differential characteristic has to be evaluated in the PLC — as a settings and stability study, as the protection model in a plant simulation or digital twin, as supervision beside the relay of record, or as the trip-matrix logic around a real 87T.
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 |
|---|---|---|
| Iw1a | REAL | x In |
| Iw1b | REAL | x In |
| Iw1c | REAL | x In |
| Iw2a | REAL | x In |
| Iw2b | REAL | x In |
| Iw2c | REAL | x In |
| ENABLE | BOOL | — |
| MEAS_OK | BOOL | — |
| HARM_OK | BOOL | — |
| H2_RATIO | REAL | p.u. |
| H5_RATIO | REAL | p.u. |
| IDIFF_MIN | REAL | x In |
| SLP1 | REAL | p.u. |
| SLP2 | REAL | p.u. |
| IREST_BP | REAL | x In |
| IDIFF_HS | REAL | x In |
| H2_LIM | REAL | p.u. |
| H5_LIM | REAL | p.u. |
| T_OP | TIME | — |
| BLK | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| TRIP | BOOL | — |
| Idiff | REAL | x In |
| inrush | BOOL | — |
| Irest | REAL | x In |
| TRIP_UNRES | BOOL | — |
| PICKUP | BOOL | — |
| PHASE | INT | — |
| BLOCKED | BOOL | — |
| ALM_MEAS_FAIL | BOOL | — |
| ALM_HARM_FAIL | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
SIP_7UT_TRF commands a real actuator. It is written to sit underneath your own interlock, permissive and protection logic — not to replace it. Commission it as you would any control block you wrote yourself.
Validation evidence
- Tests
- 11
- Simulated scans
- 100
- 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 SIP_7UT_TRF — 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.