The series parallel construction comprises individual surge arrester modules rated between 30 and 45kV interconnected by means of corona free aluminium alloy cross arm.

Each surge arrester module is completely impervious to the ingress of moisture and utilises the high mechanical strength properties of the ZnO varistors bonded by cured resin impregnated glass fibre.

The seismic performance of the 500kV arrester has been proven in two leading test facilities. Bonneville Power USA performed at Portland State University and NEL East Kilbride UK.

  No air gap therefore no internal ionisation
  Light weight compared to porcelain
  Ease of installation
  Non shattering housing
  Optimised voltage stress grading eliminates need to oversize stress grading ring, therefore the compact series parallel can be installed in tight spaces without infringing electrical or surge safety clearances.
  The diameter of the series parallel design has been calculated to reduce the radial field stress to a minimum, even under adverse environmental conditions.

Electrical Performance

  Specification: IEC60099-4
  Classification: 2PH Class 3 10kA, 3P Class 3 & 4 10/20kA, 4P Class 4 & 5 20kA and 5P Class 5 20kA
  High Current Performance: 100kA
  Energy Capability: according to IEC60099-4 (Clause 8.4.2 table 5 and 8.5.5) 2PH Class 3 7.0kJ/kV at Ur/3P Class 3 9.4kJ/kV at Ur/3P Class 4 10.8kJ/kV at Ur/4P Class 4 12.5kJ/kV at Ur/5P Class 5 16.4kJ/kV at Ur
  Voltage Rating: 2PH Rated Voltage from 15kV to 168 kV, 3P Rated Voltage from 60kV to 360 kV, 4P Rated Voltage from 96kV to 468 kV, 5P Rated Voltage from 288kV to 525 kV
  Insulation: Silicone Rubber Housing

Typical Applications

  Substations
  Capacitor Banks
  DC Inter-Connections
  Power Transformers
  Cable Terminations