Overview
The “Thermal overload protection, 1-phase” function is used to protect the equipment (reactors or resistors in the neutral point of a transformer) from thermal overload.
For more detailed information on “Thermal overload protection, 1-phase” 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 Thermal overload protection, 1-phase
| Addr. | Parameter | C | Setting Options | Default Setting |
| 49 Th.overl. # | ||||
| _:1 | 49 Th.overl. #:Mode | off on test |
off | |
| _:2 | 49 Th.overl. #:Operate & flt.rec. blocked | no yes |
no | |
| _:101 | 49 Th.overl. #:Threshold current warning | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.000 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 5.00 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.000 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 5.00 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.000 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 5.000 A | ||
| _:104 | 49 Th.overl. #:Threshold thermal warn. | 50 % to 100 % | 90 % | |
| _:105 | 49 Th.overl. #:Dropout threshold operate | 50 % to 99 % | 90 % | |
| _:106 | 49 Th.overl. #:K-factor | 0.10 to 4.00 | 1.10 | |
| _:110 | 49 Th.overl. #:Thermal time constant | 10 s to 60000 s | 900 s | |
| _:107 | 49 Th.overl. #:Imax thermal | 1 A @ 100 Irated | 0.030 A to 10.000 A | 2.500 A |
| 5 A @ 100 Irated | 0.15 A to 50.00 A | 12.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 10.000 A | 2.500 A | ||
| 5 A @ 50 Irated | 0.15 A to 50.00 A | 12.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 2.500 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 12.500 A | ||
| _:109 | 49 Th.overl. #:Tempera- ture rise at Irated | 40 K to 200 K | 70 K | |
| _:113 | 49 Th.overl. #:Storage of thermal replica | no yes |
no | |
| _:114 | 49 Th.overl. #:Behav. at I> Imax therm. | current limiting freeze therm. rep. |
current limiting | |
| _:118 | 49 Th.overl. #:Default temperature | -55°C to 55°C | 40°C | |
| _:117 | 49 Th.overl. #:Minimal temperature | -55°C to 40°C | -20°C | |
| _:44 | 49 Th.overl. #:Tempera- ture sensor | Setting options depend on configuration | ||
Logic Diagrams & highlights
Logic Diagram of the Thermal Overload Protection Function
Temperature History for Different Overload Currents (K-factor = 1.1)
