Surge arrester POLIM-H N
Silicone-housed surge arrester of IEC class station high (SH) for AC systems up to 72 kV
POLIM-H N is a surge arrester with metal-oxide (MO) resistors without spark gaps directly molded in silicone housing, grey color, designed and tested according to IEC 60099-4. POLIM-H N complies also with the following standards:
- Shock and vibration tested according to IEC 61373
- Fire and smoke behaviour tested and classified according to EN 45545-2
POLIM-H N is made fully in-house, using Hitachi Energy's trusted metal oxide resistors, since more than last forty years. This 100% in-house production enables Hitachi Energy to ensure high quality of the product. Safe, reliable and maintenance-free, POLIM-H N can be installed indoor as well as outdoor.
Applications
- Medium voltage terminal of power transformers, star point
- Large size power generators
- Arc furnace transformers
- Traction systems – fixed installations
- Rolling stock and high-speed trains
- Capacitors and capacitor banks, very high capacity
Brief performance data
| POLIM-H N | ||
| Maximum system voltage (Us) | kV | 72 |
| Continuous voltage through arrester (Uc) | kVrms | 4-44 |
| Rated voltage of arrester (Ur) | kVrms | 5-55 |
| Short-circuit current (Is) | kArms | 65 |
| Nominal discharge current (In) | kApeak | 20 |
| Repetitive charge transfer rating (Qrs) | As (C) | 2.8 |
| Thermal energy rating (Wth) | kJ/kV (Ur) | 12 |
| Specified short-term load (SSL) | Nm | 4000 |