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PEXLINK - Line Surge Arresters

PEXLINK is a concept of Line Surge Arresters (LSAs) for minimizing disturbances on overhead lines resulting from unforeseen impulse overvoltages. Based on Hitachi Energy's silicone-housed PEXLIM arrester, together with line-hardware and an automatic disconnecting device, the PEXLINK concept offers secure and robust performance to improve line availability and security of electricity supply.

The PEXLINK concept enables a reliable power grid by providing transmission line protection for a disturbance-free system operation up to 800 kV


  • Protection of over-head lines 
  • Lightning overvoltage protection 
  • Switching overvoltage control
  • Increasing line availability and reliability
  • Compact insulation lines
  • Upgrade of transmission lines
  • Extended station protection
  • Substitute for shield wires

Why Hitachi Energy?

  • Minimum maintenance cost
  • Customizable mechanical and electrical design
  • Robust installation hardware
  • Easy to install
  • Well-proven PEXLIM surge arresters
  • Automatic disconnecting device
  • Advanced wireless monitoring

Improving the reliability and availability of transmission lines

PEXLINK is Hitachi Energy concept for improving transmission line reliability and availability by providing protection of line insulation. In addition to using our well-proven polymer-housed arrester PEXLIM along with additional accessories for fixing the surge arresters across the insulators the PEXLINK concept utilizes a special disconnecting device for automatic disconnection of the arresters in the event of an overload of the arresters. The PEXLINK concept is a simple, cost-effective and proven method of increasing the performance of transmission lines.

The PEXLINK concept has traditionally employed Non-Gapped Line Arresters (NGLA) for protection of transmission lines as such solution offers several important advantages. For the system voltage of 765 kV Hitachi Energy is now also able to offer an innovative Externally Gapped Line Arrester (EGLA) solution that provides the user with many unique benefits previously reserved for NGLA solutions only like switching control.

Using Hitachi Energy's standard PEXLIM arrester

Hitachi Energy's philosophy is to provide protection for line insulation at selected locations. The main element of the PEXLINK concept is the gapless silicone polymer-housed arrester PEXLIM with metal-oxide (MO) active elements. The PEXLIM surge arrester have been used for many years for protection of equipment in sub-stations and their superior protective performances are well-known.

The low weight of the PEXLIM arrester permits installation on existing structures and the polymer housing gives increased reliability of the line equipment as well as safety for people and animals which may be in the vicinity of the lines during overstress conditions

Disconnecting Device

To ensure quick, safe, automatic and controlled disconnection of a failed arrester, Hitachi Energy uses a special disconnecting device and a suitable link in the ground circuit of the surge arresters.

PEXLINK Concept Solution

To achieve optimal placement and selection for a PEXLINK installation Hitachi Energy provides a service in which we conduct computer simulations of transmission lines to determine optimal installation strategy: e.g. installation locations, tower configuration and  arrester stress level at each of the chosen locations along a transmission line. This approach will ensure that the installation strategy is cost-efficient whilst maximizing the performance improvements.

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