Overview
The “Unbalanced load protection” function detects unbalanced loads or line interruptions of electrical machines (generators and motors). Unbalanced loads create a counter-rotating magnetic field at double frequency in the rotor, and also overheat the damper winding.
For more detailed information on “Unbalanced load protection” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Setting Parameters
Setting parameters for Unbalanced Load Protection
| Addr. | Parameter | C | Setting Options | Default Setting |
| Therm. Stage 1 | ||||
| _:11011:1 | Therm. Stage 1:Mode | off on test |
off | |
| _:11011:2 | Therm. Stage 1:Operate & flt.rec. blocked | no yes |
no | |
| _:11011:101 | Therm. Stage 1:Max. continuously perm. I2 | 3.0 % to 30.0 % | 10.0 % | |
| _:11011:102 | Therm. Stage 1:Unbalanced load factor K | 1.0 s to 100.0 s | 15.0 s | |
| _:11011:103 | Therm. Stage 1:Cooling time therm.replica | 0 s to 50000 s | 1500 s | |
| _:11011:104 | Therm. Stage 1:Warning delay | 0.0 s to 60.0 s;∞ | 15.0 s | |
Logic Diagrams & highlights
Logic Diagram of the Unbalanced-Load Protection Function
Operate Curve of the Unbalanced-Load Protection
Calculation of functional measured value ΘI2/Θop
Example of an Unbalanced-Load Characteristic Specified by the Machine Manufacturer
