PSPN */10/III - OVERVOLTAGE LIMITER – LINE DISCHARGE CLASS 3

PSPN */10/III - OVERVOLTAGE LIMITER – LINE DISCHARGE CLASS 3

PSPN */10/III is an overvoltage limiter designed for internal use to protect high-voltage transmission networks; transformers, switchgears, HV cable distribution systems and, in particular, cable heads of enclosed substations from the effects of atmospheric and switching overvoltage. The functional part of the limiters consists a column of varistors sized for max. continuous operating voltage UC, the outer insulating shell is made from silicon material (grey colour). The material of the shell shows high resistance to the effects of surface leakage currents and to electric arc, possesses hydrophobic properties and shows excellent resistance to weather effects, pollution and UV radiation. The cover caps, connecting screws, nuts and terminals are made of stainless steel. With their design and technical parameters, the overvoltage limiters of the PSPN series conform to the standards ČSN EN 60099-4 and IEC 60099-4.

PSPN 7/10/III is suitable e.g. for the protection of AC mining distribution systems of 6kVef networks.
 

Advantages

  • •  Long protective distance
  • •  High absorption capacity
  • •  Stable U-I characteristics even after repeated discharges
  • •  Resistance to ageing
  • •  Design resistant to explosion and bursting
  • •  Resistance to pollution and UV radiation
  • •  Resistance of the shell to rough handling
  • •  Maintenance-free design
  • •  Resistance to shocks and vibrations
  • •  High mechanical resistance


Transport and storage

The overvoltage limiters may not be exposed to strong shocks and impacts during transport. They should be stored in the long term in an indoor store.


Maintenance

No testing of the function or maintenance such as cleaning is necessary during the anticipated life of the limiter.