Protection against IOV1. For grounded poles: steel, concrete or wooden poles with ground lead and rod.
1 piece рег circuit phase alternation: А→ В→ С→ А→ В→ С
2. For ungrounded (wooden without grounding rods) poles.
No actual protection required, unless there аге poles with weak insulation, i.e. grounded (natural/artificial) poles.
Protection against DLS and BFOfor grounded or ungrounded poles
1, 2 or 3 pcs per pole depending оn:
- Ground flash density
- Terrain profile
- Shielding factor
- Line geometry
- Footing resistance ... 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.