Surge arrester POLIM-S..N
Silicone-housed surge arrester of IEC class station medium (SM) for AC systems up to 72 kV
POLIM-S..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; and it fulfills the requirements of ANSI/IEEE C62.11. POLIM-S..N also has other certifications:
- Shock and vibration tested according to IEC 61373
- Fire and smoke behavior tested and classified according to EN 45545-2
It is used for secure protection of medium voltage systems against overvoltages from atmospheric discharges and switching conditions.
Applications
- Power transformer, medium-voltage terminal, star point
- Arc furnace transformer
- Medium-voltage motor
- Large size power generator
- Traction systems – fixed installations
- Rolling stock and high speed trains
- Capacitors and capacitor banks, high capacity
Why Hitachi Energy?
- Over 100 years of experience in overvoltage protection and more than 30 years with silicone insulation
- Local and global Hitachi Energy application support
- Proven safe short-circuit current design
- Design life of more than 30 years
- Own production of metal-oxide (MO) resistors
- Excellent protection level with low residual voltage
- UV resistant silicone housing with excellent pollution performance
- Mechanically strong design
- Maintenance free
- Stable against shock and vibration
Brief performance data
| Polim-S..N | ||
|---|---|---|
| Maximum system voltage (Us) | kV | 72 |
| Continuous voltage through arrester (Uc) | kVrms | 4-44 |
| Rated voltage of arrester (Ur) | kVrms | 5-55 |
| Nominal discharge current (In) | kApeak | 10 |
| Short-circuit current (Is) | kArms | 50 |
| Thermal energy rating (Wth) | kJ/kV (Ur) | 8.0 |
| Specified short-term load (SSL) | Nm | 3840 |
For more details see the data sheet in downloads below.
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