Overview
The “Thermal overload protection with user defined characteristic curve” function is used to protect the equipment (motors, generators, and transformers) against thermal overloads. It realize a manufacturer specific overload characteristic curve for specific equipment, for example, shunt
reactors, and monitor the thermal state of motors, generators, and transformers.
For more detailed information on “Thermal overload protection with user defined characteristic curve” 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 with user defined characteristic curve
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:1 | User charact.#:Mode | off on test |
off | |
| _:2 | User charact.#:Operate & flt.rec. blocked | no yes |
no | |
| _:102 | User charact.#: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 | User charact.#:Threshold thermal warn. | 50 % to 100 % | 90 % | |
| _:105 | User charact.#:Dropout threshold operate | 50 % to 99 % | 90 % | |
| _:106 | User charact.#:Emerg. start T overtravel | 0 s to 15000 s | 300 s | |
| _:107 | User charact.#:Imin cooling | 1 A @ 100 Irated | 0.000 A to 10.000 A | 0.500 A |
| 5 A @ 100 Irated | 0.00 A to 50.00 A | 2.50 A | ||
| 1 A @ 50 Irated | 0.000 A to 10.000 A | 0.500 A | ||
| 5 A @ 50 Irated | 0.00 A to 50.00 A | 2.50 A | ||
| 1 A @ 1.6 Irated | 0.000 A to 1.600 A | 0.500 A | ||
| 5 A @ 1.6 Irated | 0.000 A to 8.000 A | 2.500 A | ||
| _:108 | User charact.#:Cool- down factor Tau | 0.5 to 20.0 | 7.0 | |
| _:109 | User charact.#:Storage of thermal replica | no yes |
no | |
| _:110 | User charact.#:Imax thermal | 1 A @ 100 Irated | 0.030 A to 35.000 A | 2.500 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 12.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 2.500 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 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 | ||
| _:111 | User charact.#:Behav. at I> Imax therm. | current limiting freeze therm. rep. |
current limiting | |
| _:112 | User charact.#:Operate char. curve | Setting options depend on configuration | 1.1 p.u., 600 s | |
| _:101 | User charact.#:Curve based on preload | 0 % to 100 % | 100 % | |
Logic Diagrams & highlights
Logic Diagram of the Function Block Filter
Logic Diagram of the Thermal Overload Protection, User-Defined Characteristic Curve Function
Logic Diagram of the Stage Control
User-Defined Characteristic Curve with Replica of Standard Characteristics
Temperature History for Different Overload Currents ( K-factor = 1.1)
Example of the User-Defined Characteristic Curve
