Surge arrester POLIM-H..-..
Silicone-housed surge arrester of IEC class station high (SH) for AC systems up to 72 kV
POLIM-H ..-.. 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-H ..-.. 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
This surge arrester is used for protection of medium voltage systems against overvoltages from atmospheric discharges and switching conditions.
Applications
- Power transformer, medium-voltage terminal, star point
- Arc furnace transformer
- 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
- High energy withstand capability
- UV resistant silicone housing with excellent pollution performance
- Maintenance free
- Mechanically strong design
- Stable against shock and vibration
- High speed train tested
Brief performance data
| POLIM-H..-.. | ||
| 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 |
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