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Kim D.S.,Korea Institute of Ceramic Engineering And Technology | Lee D.-H.,Korea Institute of Ceramic Engineering And Technology | Kim Y.J.,LS cable | Kim Y.J.,Korea Electronics Technology Institute | And 3 more authors.
Applied Mechanics and Materials | Year: 2014

MgO/XLPE composites, composed of micro- and nano sized MgO material havingdifferent particle size as inorganic filler and cross linked polyethylene (XLPE), were prepared andinvestigated to the space charge dynamics of these composites for high voltage DC insulation. AddedMgO material, having 50nm to 1μm in size, were synthesized from the calcination of Mg(OH)2nano-platelets which was controlled by potassium content in Mg(OH)2, varying the dilution volumeratio of distilled water/ Mg(OH)2 suspension. MgO/XLPE composites were obtained by thoroughlymixing LDPE and dicumyl peroxide (DCP) as the cross-linking agent and silane modified MgObefore kneading to enhance the dispersion degree of the composites. The space charge distributions ofthe composites were observed by controlling the particle size and content of a dispersed MgO inXLPE matrix. To prevent the breakdown under high DC stress, it was found that the reduction ofspace charge of MgO/XLPE composite depends upon the smaller size of MgO particle and the itscontent above 0.5 phr (per hundred part of resin, wt%). MgO material and MgO/ XLPE compositeswere characterized with TEM, XRD, BET, ICP, and the space charge properties of the compositeswere measured by a pulsed electro-acoustic method (PEA). © (2014) Trans Tech Publications, Switzerland. Source

Sim K.,Korea Electrotechnology Research Institute | Kim S.,Changwon National University | Jang H.-M.,LS cable | Lee S.K.,LS cable | And 2 more authors.
Journal of the Korea Institute of Applied Superconductivity and Cryogenics | Year: 2010

The renewable energy source is considered as a good measure to cope with the global warming problem and the fossil energy exhaustion. The construction of electric power plant such as an offshore wind farm is rapidly increasing and this trend is expected to be continued during this century. The bulky and long distance power transmission media is essential to support and promote the sustainable expansion of renewable energy source. DC power cable is generally considered as the best solution and the demand for DC electric power has been rapidly increasing. Especially, the high temperature superconducting (HTS) DC cable system begins to make a mark because of its advantages of huge power transmission capacity, low transmission loss and other environmental friendly aspects. Technical contents of DC HTS cable system are very similar to those of AC HTS cable system. However the DC HTS cable can be operated near its critical current if the heat generation is insignificant, while the operating current of AC HTS cable is generally selected at about 50~70% of the critical current because of AC loss. We chose the specifications of the cable core of 'Tres Amigas' project as an example for our study and investigated the heat generation when the DC HTS cable operated near the critical current by some electric and thermal analyses. In this paper, we listed some technical issues on the design of the DC HTS cable core and described the process of the cable core design. And the results of examination on the current capacity, heat generation, harmonic loss and current distribution properties of the DC HTS cable are introduced. Source

Choi S.,Yonsei University | Lee S.,Uiduk University | Sim K.,Korea Electrotechnology Research Institute | Cho J.,Korea Electrotechnology Research Institute | And 6 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2010

In Korea, the superconducting power cable has been developed since 2001, with the basic specifications of 22.9 kV/50 MVA. The superconducting power cable can carry more than 2 to 5 times higher electric power compared with conventional ones. It is important to test the DC critical current related with its power capacity before applying to the real power grid. In 1995, several international standards organizations including IEC, decided to unify the use of statistical terms related with accuracy or precision in their standards. It was decided to use the word uncertainty for all quantitative (associated with a number) statistical expressions. In this paper, we measured DC critical current of 22.9 kV/50 MVA superconducting power cable with several voltage tap and analyzed the uncertainty with these results. These analyzed results can be applied the standardization of the superconducting power cable © 2006 IEEE. Source

Sohn S.-H.,KEPCO E&C | Yang H.-S.,KEPCO E&C | Lim J.-H.,KEPCO E&C | Oh S.-R.,KEPCO E&C | And 4 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2012

Korea Electric Power Corporation (KEPCO) has a great interest on the application of HTS cable to its network to relieve power congestion and enhance the reliability of the power system. Down through the years from 2005 to 2010, the 22.9 kV, 50 MVA HTS cable has been demonstrated by field test, showing affirmative results. With the financial support of Ministry of Knowledge and Economy (MKE), the new project to install and operate the HTS cable in electrical network of Korea was launched in 2008. An HTS cable with the 22.9 kV, 50 MVA, and 410 m length was installed in the KECPO grid in the end of 2010. After the integration of the HTS cable system, the commissioning items of the DC withstand voltage test, DC critical current test, and heat loss measurements were conducted in accordance with the Korean industrial standard, and self-defined specifications. The HTS cable was energized on the 154 kV Icheon substation of KEPCO on August 19th, 2011. The details of the project description, onsite installation, and commissioning tests are presented in this paper. © 2002-2011 IEEE. Source

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