The High-Tech Research & Development Centre of Kim Il Sung University has recently developed 6kV and 10kV zinc oxide arresters with effective protection against overvoltage.
As a technical power control device to prevent damage from thunderbolt or impulse-wave voltage, the lightning arrester has a wide application.
Members of the electronic materials research group including Mun Chol Ho, PhD, buckled down to the research into the fourth-generation nonlinear resistance, an essential component of arrester, in order to develop a new one that suits the specific conditions of the country.
They deepened the research as they focused on reproducibility while meeting the technical indices conflicting with each other in the making of semiconductor ceramics.
In the course of this, they found out a new materials composition method of doubling the nonlinear zinc oxide resistance and established a technology of miniaturizing and lightening the arrester by making the particles smaller.
The new type of arrester which is less than half the size, weight and manufacturing cost as compared to the previous arresters has scientifically proved economical through the trial introduction and state certification.
“The application of 6kV zinc oxide arrester to our substation has remarkably reduced the rate of accident of peripheral electric equipment caused by thunderbolt as compared to previously and also improved the operational safety in the relevant voltage system,” said Kim Pyong Su, director of the Jongju City Power Distribution Station, North Phyongan Province.
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