Overview
The “Inrush current and 2nd harmonic detection” function recognizes an inrush process on transformers, generates a blocking signal for protection functions that protect the transformer (protected object) or for protection functions that are affected in undesirable ways when transformers are switched on, and allows a sensitive setting of the protection functions.
For more detailed information on “Inrush current and 2nd harmonic detection” 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 Inrush-Current Detection
| Addr. | Parameter | C | Setting Options | Default Setting |
| Inrush detect. | ||||
| _:1 | Inrush detect.:Mode | off on test |
on | |
| _:106 | Inrush detect.:Operat.- range limit Imax | 1 A @ 100 Irated | 0.030 A to 35.000 A | 7.500 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 37.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 7.500 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 37.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 7.500 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 37.500 A | ||
| _:111 | Inrush detect.:Blocking with CWA | no yes |
yes | |
| _:110 | Inrush detect.:Blocking with 2. harmonic | no yes |
yes | |
| _:102 | Inrush detect.:2nd harmonic content | 10 % to 45 % | 15 % | |
| _:112 | Inrush detect.:Cross- blocking | no yes |
no | |
| _:109 | Inrush detect.:Cross- blocking time | 0.03 s to 200.00 s | 0.06 s | |
| _:114 | Inrush detect.:Start flt.rec | no yes |
yes | |
Setting parameters for 2nd Harmonic Ground Detection
| Addr. | Parameter | C | Setting Options | Default Setting |
| 2.hrm.det. gnd | ||||
| _:1 | 2.hrm.det. gnd:Mode | off on test |
on | |
| _:9 | 2.hrm.det. gnd:Meas- ured value | 3I0 calculated IN measured |
IN measured | |
| _:102 | 2.hrm.det. gnd:2nd harmonic content | 10 % to 45 % | 15 % | |
Setting parameters for 2nd Harmonic Detection 1-Phase
| Addr. | Parameter | C | Setting Options | Default Setting |
| 2.hrm.det. 1ph | ||||
| _:1 | 2.hrm.det. 1ph:Mode | off on test |
on | |
| _:102 | 2.hrm.det. 1ph:2nd harmonic content | 10 % to 45 % | 15 % | |
Logic Diagrams & highlights
Basic Structure of the Inrush-Current Detection
Logic of the Harmonic Analysis Function (T = 1 Period)
Inrush-Current Characteristic
Logic of the CWA-Method Function (T = 1 Period)
Logic Diagram of the Inrush-Current Detection
Logic of 2nd Harmonic Detection Ground
Logic of the Harmonic Analysis Function
Logic of 2nd Harmonic Detection 1-Phase
Logic of the Harmonic Analysis Function
