• The Transactions of the Korean Institute of Electrical Engineers C
• /
• v.51 no.2
• /
• pp.80-84
• /
• 2002

This paper presents some of the results of current research on 400kN Suspension Insulator Design. In this paper, authors carried out 2-dimensional field calculation in order to analyse dielectric characteristics of the insulator unit and 3-dimensional field calculation in order to analyse dielectric characteristics of the insulator strings. And the results of puncture tests of insulators were compared with the required field intensity of the insulator As results, it was found that electric field on the insulator unit is severest between two triple junctions, dielectric characteristics of insulator strings are much influenced by the surrounding configuration and the manufactured insulators have good results of puncture tests.

• The Transactions of the Korean Institute of Electrical Engineers C
• /
• v.52 no.8
• /
• pp.348-353
• /
• 2003

This paper was the research of high voltage suspension insulator (400 [kN]) including pottery stone, feldspar, clay and alumina of 17 [wt%]. The slurry was fabricated after ball milling mixed raw materials. Green compacts were made by the extrusion of jiggering method and were sintered at 1300[$^{\circ}C$] for 50 [min.] in the tunnel kiln. The sintered density was reached to 97% of theoretical density, and the bending strength was 1658 [k $g_{f}$/$\textrm{cm}^2$] and hardness and fracture toughness which was measured by ICL( indentation crack length ) method were 1658 (kgf/$\textrm{cm}^2$) and 27.5 [Gpa], respectively. In measurement of tana and insulation break voltage of 400 (kN) porcelain, tan$\delta$ took some numerical value between 17${\times}$10$_{-3}$ and 61${\times}$10$_{-3}$ and insulation break voltage value was 19.9$\pm$1.4 [㎸/mm]. The test was performed to research whether the shape of pin affect a overvoltage break load or not As a consequence, when a pin was designed a pin diameter 51 [mm] with the bottom form of two-step constructed with straight in the suspension insulator, Insulator showed overvoltage break load 52 [ton] of the highest value and reflected a fine characteristic in aged deterioration test which is one of the accelerated aging test. Also it could be confirmed a fine characteristic through performing the test that electrical property of insulator was established correctly in accordance with IEC 60383-1 standards.s.

• Proceedings of the KIEE Conference
• /
• 2002.07c
• /
• pp.1434-1436
• /
• 2002

The 400KN suspended insulator was fabricated with feldspar, quartz, clay and $Al_2O_3$ wt% for extra high voltage. These materials were grinded with ball milling for 25 hours after mixing them. The grinded materials were sintered at $1300^{\circ}C$ for 50 minutes in the tunnel kiln after mading with jiggering method. The sintered density of specimen was reached at 97% in comparison with that of theory. The specimen had the characteristic of temperature rise with the increase of electrical losses. Also, the flexural strength and the fracture toughness of sintered parts respectively were 1658 kg/$cm^2$ and 2.3 $MPa{\cdot}m^{1/2}$.

• Proceedings of the KIEE Conference
• /
• 2004.07c
• /
• pp.1637-1639
• /
• 2004

In order to analyze the physical and chemical characteristics of the home production porcelain insulators by change of the alumina addition amount, 36000lbs ball socket type suspension insulators which were manufactured in 1989, 1995 and 2001 removed in transmission line and an experiment was performed. By the result, 8 [wt.%] alumina that influences the mechanical properties and arc resistance properties in case of insulators that were manufactured in 1989 was contained, and the relative density and the fracture toughness of insulators appeared by 94.2% and 1.4 [MPa $M^{1/2}$], respectively. However, 12 [wt.%] alumina was contained in case of insulators that were manufactured in 1995, and the relative density and the fracture toughness of insulators appeared preferably lower by 92% and 1.3 [MPa $M^{1/2}$], respectively. Amount of alumina was contained most by 17 [wt.%] in case of insulators that were manufactured in 2001. It was confirmed that the electrical and mechanical characteristics such as the relative density and the fracture toughness appeared excellently by 96% and 1.7 [MPa $m^{1/2}$], respectively.