Impulse current laboratory
The impulse current test system includes two exponential and a long-duration current impulse circuits.
Exponential current impulse circuit
The exponential impulse current test systems can be configured for lightning, switching, high and steep impulse currents, for example for measuring surge arrester or varistor characteristics. The tests are carried out in accordance with IEC 60099-4. The different current forms with the maximum possible current levels and residual voltages are listed below.
Technical data:
| Type | Current shape | Max. charging voltage | Current | Residual voltage |
|---|---|---|---|---|
| Lightning Current Impulse | 8/20 | 100 kV | 50 kA | 40 kV |
| Lightning Current Impulse | 8/20 | 500 kV | 10 kA | 300 kV |
| Switching Current Impulse | 30/70 | 100 kV | 7 kA | 40 kV |
|
High Current Impulse |
4/10 | 100 kV | 210 kA | 60 kV |
|
Steep Current Impulse |
1/<20 | 100 kV | 20 kA | 30 kV |
Long-duration current impulse circuit
The long-duration current impulse circuit is used to study the long wave strength respectively the charge transfer rating, which serve as measures of the single-pulse energy absorption capacity of surge arresters or varistors. The possible current forms are listed below.
Technical data:
| Type | Current shape | max. charging volt. | Current | Residual volt. |
|---|---|---|---|---|
| Long wave | 0,5 ms | 40 kV | (20 kA) | 25 kV |
| Long wave | 1 ms | 40 kV | (10 kA) | 25 kV |
| Long wave | 2 ms | 40 kV | 5,5 kA | 25 kV |
| Long wave | 2,4 ms | 40 kV | 25 kV | |
| Long wave | 2,8 ms | 40 kV | 25 kV | |
| Long wave | 3,2 ms | 40 kV | 25 kV | |
| Long wave | 4 ms | 40 kV | 2,5 kA | 25 kV |
| Long wave | 5 ms | 40 kV | 2 kA | 25 kV |
| Sinus half wave | 90/200 µs | 50 kV | 60 kA | 35 kV |
