Technical Characteristics –
- This surge arrester is a metal oxide varistor surge arrester in an elbow configuration.
- Each arrester is tested for AC withstand and partial discharge prior to leaving the factory
Design –
Surge arrester comprising:
- Bail restraint.
- Conductive EPDM insert.
- Type A – 250 A interface as described by CENELEC EN 50180 and 50181.
- Pin contact.
- Contact disc.
- Copper shunt.
- Metal oxide valve elements.
- Aluminium spacer.
- Steel cap.
- Earth connection.
- Insulating EPDM layer moulded between the insert and the jacket.
- Conductive EPDM jacket.
| Surge arrester type | Nominal discharge current In (kA) | Rated voltage Ur (kV) | Max continuous operating voltage Uc (kV) | Steep current residual voltage @ 5 kA (1/20 µs) [kV] | Lightning current residual voltage @ 5 kA (8/20 µs) [kV] | High current impulse withstand (kA) |
|---|---|---|---|---|---|---|
| 156SA-12 | 5 | 15 | 12.5 | 62.5 | 54.5 | 40 |
| 156SA-15 | 5 | 19 | 15.5 | 77.0 | 69.0 | 40 |
| 156SA-18 | 5 | 22 | 18.0 | 87.0 | 79.0 | 40 |
| 156SA-21 | 5 | 26 | 21.0 | 101.5 | 93.5 | 40 |
| 156SA-24 | 5 | 30 | 24.5 | 116.5 | 108.5 | 40 |
