Transmission Lines

Lightning Protection



A surge arrester is a device used on electrical power systems to protect all other equipment in a network system from the damaging effect of lightning, system faults or switching, the gapless type surge arrester having metal oxide varistors (MOVs) have been efficiently used for power system protection. The typical lightning arrester also known as surge arrester has a high voltage terminal and a ground terminal. When a lightning surge (either by direct stroke or induction from a nearby stroke) or switching surge travels down the power system to the arrester, the current from the surge is diverted around the protected insulation in most cases to earth.

With superior designed non-linear voltage-current characteristics, high quality, reliability MOVs type encapsulated in polymer housing surge arresters offer such special features inherent in gap-less structure as quick response to surge voltage, high energy dissipation capability, safe operation, compactness / lightweight and freedom from pollution and economy. By the same technology as distribution system, the low voltage gapless surge arrester with high quality of MOVs block are well proved to PEA low voltage system before supplying the electricity to residential customers.

As the use of products and equipment with components and insulation systems vulnerable to voltage surges and spikes continues to increase, the requirement for surge arresters to protect against the effects due to lightning strikes, switching phenomenon, etc., continues to extend from HV transmission and distribution systems to communication and computer network system as well.

The first class in lightning protection products, DAT-CONTROLLER PLUS had been designed to capture the lightning provided the protection system with ES LAT - Early Streamer Emission lightning conductors help the creation of the discharge path, receiving in this way the impact of the lightning stroke. Early Streamer Emission Lightning Conductor in characterized by its reaction to the lightning approach, being the first one to capture it in its radius of action, to conduct it to the ground in a safe way, immediate reaction, maximal resistance, non perishable, and performance under rain. Conventional Air Terminal product group can be designed in various patterns to protect from lightning damage, individual lightning rods are sometimes called Air Terminal, metal strip or rod, usually of copper or aluminum, installed on the top of the structures.


The equipment shall have successfully passed all the type tests or design tests in accordance with the Thai Industry Standards and the following international standards:

  • IEC Publication 60099-4: 1991 Surge arresters-Part 4: Metal-oxide surge arresters without gaps for ac systems.
  • IEC Publication 61109: 1992 Composite insulators for ac overhead lines with a nominal voltage greater than 1000 V. Definitions, test methods and acceptance criteria.
  • IEC Publication 61643-1:1998 Surge protective devices connected to low-voltage power distribution systems. Part 1: Performance requirements and testing methods.

All the products shall be completely passed the routine test before delivery to the local and oversea customers.


  • HV Surge Arrester (Up to 30 kV 5kA and 10 kA)
  • Lightning Protection Equipment (Air Terminal Base, Conventional Air Terminal, Early Streamer Emission Air Terminal, Ground Bar and Accessories, Lightning Cable/Tape Connector and Clamp, Lightning Conductor and Accessories)
  • LV Surge Arrester (Type NP, Type PMS)


The equipment shall have successfully passed all the type tests or design tests in accordance with the Thai Industry Standards and the following international standards: