Installation methods

Protection against IOV

1. For grounded poles: steel, concrete or wooden poles with ground lead

Basic recommendations for using LLPD i-series:
Sections of an overhead line located on:
  • Line is surrounded by high objects shielding it from direct lightning strikes (forest, city, over lines, etc.)
  • Valley/ravine areas
  • Areas subjected to frequent lightning strikes
  • Areas with poor accessibility

llpd i-series.png

1 piece рег circuit phase alternation: А→ В→ С→ А→ В→ С 

2. For ungrounded (wooden without grounding) poles (for both bare and covered conductors)

Protection against DLS and BFO

For grounded or ungrounded poles

Basic recommendations for using LLPD d-series:
Sections of an overhead line located on:
  • Open areas without natural shielding
  • Hilly, mountainous areas
  • River crossings
  • Areas subjected to frequent lightning strikes 3-4 poles before substation (for nominal system voltage < 35kV - considering average span of 50-70 m; considering 35 kV average span
  • of 150-200 m)
llpd d-series.png
1, 2 or 3 pcs per pole depending оn:
  • Ground flash density
  • Terrain profile
  • Shielding factor
  • Line geometry
  • Footing resistance
  • BIL of the line presence of shielding wire
  • ... and other factors*

* Streamer offers а full range of services to choose optimal configuration of LLPDs installation via our own software.
Contact us for more details

Installation method for power transformer protection

It is necessary to protect not only the line and insulators from damage and unwanted outages but also the pole-mounted distribution transformers which are deployed along the line.
The main device for transformers protection from lightning surges is a surge arrester. Unfortunately, with frequent activations due to overvoltages, the arrester reaches the limit of its capability and is unable to damp pulses anymore which leads to breakdowns, leaving the transformer unprotected in case of new overvoltage. This is especially true for poles with high values of footing resistance. To avoid this situation, Streamer has developed a solution for protecting arresters and improving the reliability of the transformer.


Streamer recommends installing 3 LLPD d-series on poles adjacent to the transformer and to ground them. In case of DLS  or IOV, LLPD limits surge of overvoltage on both sides of the protected transformer, reducing the load on the arresters and preventing the arresters from breaking down.

Thus, the Streamer’s solution allows to extend the lifespan of the arresters and as a result provides protection of the transformer.

You can find more information about Installation methods in the LLPD catalog (page 12)

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