Line Lightning Protection Device - Overhead line lightning LLPD

For  over 20 years, LLPD, lightning lightning protection devices are protecting thousands of kilometers of overhead lines against lightning. With an installed based of 1.5 millions devices, utilities have increasing understood the benefits of their usage.   


OVERHEAD WITHOUT LLPD



WITH LLPD


HOW DOES IT WORK

EasyQuench is a unique technology, developed and being improved since 1996 by Streamer. Products featuring the EasyQuench technology protect overhead lines against direct and indirect lightning strikes, thus helping to prevent breakage of conductors, insulators and power outages. Due to their operating principle, line lightning protection devices (LLPDs) do not require any special grounding (e.g. a ground lead). Therefore, these devices are especially efficient in areas with high soil resistivity.

The Operating principle of LLPDs with the EasyQuench system is based on the following concepts:

1. Insulation coordination. Coordination of lightning protection devices with line insulation is necessary for ensuring proper operation and is achieved by adjusting BIL (CFO) of LLPD so that it is lower than those of the protected insulator. By fulfilling this requirement, it can be guaranteed that in case of a direct or an indirect lightning strike, the LLPD will operate faster this way protecting the line insulator from a flashover.

2. Follow current interruption. Since all power lines are connected to transformers, when there's a flashover of LLPD somewhere on the line, power frequency short-circuit current (or follow current) starts flowing immediately through it. Thanks to the EasyQuench system, LLPD can stop the fault current within one half of the period.




The EasyQuench system consists of a series of small discharge/arcing chambers, being formed by two adjacent metal electrodes placed in a silicone rubber body. Electrodes are separated from each other with tiny air gaps, that break down as soon as the LLPD is subjected to lightning overvoltage. When follow current starts flowing through the EasyQuench system, it immediately gets split into a series of small power arcs located inside the device. Each of the miniature arcs is then quenched individually. When power frequency follow current crosses zero, it is eliminated. The line then immediately gets back to normal operation, therefore no short circuit will be sensed by protection relays and there will be no outage or power supply interruption.


ADVANTAGES

  • Prevents outages on the line
  • No maintenance required
  • Quenches follow current in less than 10 ms
  • Protects overhead lines from direct lightning strike and induced overvoltage 
  • Works perfectly in areas with high soil resistivity
  • 20 years life expectancy


MORE INFO


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Posted by Matthieu
on January 7, 2020 at 11:14

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