• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.53-54
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• 2017

In this paper, we have studied the electrostatic discharge test for the battery protection circuit module in the lithium ion battery used as a smartphone battery which is used to prevent the explosion hazard due to overcharge, over discharge, and short-circuit. A lithium ion battery of S company was used as an experimental sample, and an ESD gun simulator compliant with IEC 61000-4-2 standard was used for electrostatic discharge injection. The contact discharge was applied to the various pins of the battery protection circuit module in increments of 2 kV in the range of 2 kV to 10 kV and in 5 kV increments in the range of 10 kV to 30 kV.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.3
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• pp.101-106
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• 2003

The high temperature superconductor transformers gain interests from the industries. This paper described construction and test results of 10㎸A HTS transformer Three phase transformer with double pancake windings were constructed. To reduce the leakage magnetic field, secondary coil were placed between the two primary coils. BSCCO-2223 wire. silicon sheet steel core and FRP cryostats were used to construct the transformer. Three coils were stacked in one cryostat. Two double pancake coils were connected in series for the primary coil and one double pancake coil was used for the secondary coil. Total number of turns of the primary winding and the secondary winding were 112turns and 98urns, respectively, The rated voltages of each winding were 440/220V. The rated currents of each winding were 13.1/26.2A. After the tests of basic properties of the three phase HTS transformer using no-load test, short-circuit test and full-load test, continuous operation of 100 hours with pure resistive load has been carried out. Test results proved over-load capability and reliability of the HTS transformer.

• Proceedings of the KIEE Conference
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• 2000.07a
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• pp.567-569
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• 2000

대전력시험 설비 중 단락발전기는 시험에 필요한 에너지를 발생시키는 근원으로서 시험하고자 하는 피시품의 시험용량에 따라 설계되고 제작되어야 한다. 본 논문에서는 LG산전 대전력시험 설비 중 단락발전기에 대한 설계 개념, 전기적 및 기계적인 특성, 또한 일반 발전기와는 다르게 특별히 설계된 주요 특징 등에 대하여 기술하며, 피시품의 단락시험 중에 발생하는 시험 시퀀스 및 이에 대한 기술적인 내용을 기술한다. 또한, 단락발전기의 시운전 및 성능 확인 시험 결과에 대한 내용을 기술하고, 시험 중 발생할 수 있는 내용에 대하여 고찰하여 본다.

• Progress in Superconductivity and Cryogenics
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• v.5 no.2
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• pp.30-35
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• 2003

The inductive superconducting fault current limiter (SFCLJ limits the fault current with its dc reactor. To fabricate the optimal dc reactor for inductive SFCL, several design and manufacturing technologies are necessary. In this paper, the manufacturing technology for dc reactor and cryogenic cooling method are described in detail. GM-cryocooler was used enlarge the critical current of dc reactor by cooling down the temperature of dc reactor about 20 K. Moreover, the results of short circuit test were described. Finally, the thermal characteristics of conduction-cooled system were discussed and then, sub-cooled nitrogen system was proposed to enhance the thermal stability of dc reactor.

• Progress in Superconductivity
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• v.5 no.2
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• pp.136-140
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• 2004

We fabricated and tested a resistive superconducting fault current limiters (SFCL) operated at 3.8 ㎸ based on YBCO thin films. The SFCL was composed of 7 components connected in series. Each component was designed to be capable of current limiting at 600 V, and has a SiC shunt resistor ( $R_{s}$) of 40 Ω in Parallel. Short circuit tests were carried out fur 0 and 90 degree faults lasting fur 5 cycles. The test results showed that the 7 components were quenched simultaneously under the safe quenches and evenly shared the applied voltage. The SFCL successfully suppressed the fault currents below 94 $A_{peak}$ within the quarter cycle after fault.t.t.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2000.11a
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• pp.251-256
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• 2000

The assessment of the condition of a transformer winding which is suspected of having suffered short circuit damage can be difficult. Conventional test such as winding resistance, magnetisation current or insulation resistance will only detect damage if a permanent electrical fault exists. Visual inspection of windings necessitates the removal of oil and in many cases only a very small proportion of the winding can be seen. We describe the characteristics. As the front rise time of recurrent-surge generator pulse less than 1000ns and the peak value of pulse is about 500V, we have the good results of detecting winding deformation in the LVI test of transformers.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.5
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• pp.430-436
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• 2008

This paper proposes a way to predict electrical lifetime of a relay using Accelerated Life Testings (ALTs). The relay of interest mounting on printed circuit boards is usually under an inrush current stress. The inrush current is generated and accelerated through controlling a lamp switching device in the ALT. We find that the dominant failure mechanism under high levels of inrush current would be contact welding in the contact surface of the relay and the contact welding process is accelerated according to increase in inrush current. The electrical lifetime model based on Inverse Power Law in term of inrush current is proposed, and parameters characterizing relay's lifetime distribution are statistically estimated using ALTA 6 PRO software.

• Proceedings of the KIEE Conference
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• 2002.07c
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• pp.1804-1806
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• 2002

KEPCO has a plan to operate 765kV electric power network from June, 2001, by the KEPCO's plan. We have developed the extra-high voltage class equipments for 765kV substation. Inpecial, we have proceeded the developments of 800kV Gas Insulated Switchgear from January 1998 to now. Until now we completed the test of a general characteric tests of GIS, the short-circuit test of GCB. DS. ES. HSGS.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.33-35
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• 1999

This paper describes the test results of the single phase 3kVA high temperature superconducting power trans-former. The tapes are made with Bi-2223 and have silver alloy as the matrix. Four double pancake windings are used in total. Among them two double pancake windings are connected in series for high voltage winding and two double pancake windings are connected in parallel for low voltage winding. The rated voltages of each winding are 220/110 V. Fundamental characteristics are obtained through short circuit and no load tests. The over load capability and characteristics are investigated.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.12a
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• pp.58-62
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• 2006

The purpose of this paper is characteristic analysis of permanent magnet generator (PMG) for automatic voltage regulator (AVR)power of brush less synchronous generator. However, this PMG has a spoke type permanent magnet rotor with large overhang for high power density, characteristic analysis considering concentration effect of air-gap flux density due to the overhang should be performed. 30 transient finite element method (FEM)analysis is good solution for overhang parameter, but this method needs too much calculation time. In this paper, we examined the overhang effects based on overhang length and material of rotor core by using 20 and 30 static FEM analysis, and proposed 20 dynamic FEA model considering overhang parameter which gives good and rapid results. The proposed method is verified by the test results of no load, load and short circuit test.