• The Transactions of the Korean Institute of Electrical Engineers B
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• v.49 no.9
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• pp.572-577
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• 2000

This paper describes the test results of a single phase 3kVA high temperature superconducting power transformer. The tapes are made with Bi-2223 and have silver alloy as the matrix. Four double pancake windings are used. Among them two double pancake windings are connected in series for high voltage winding and the others are connected in parallel for low voltage winding. The rated voltage and current of primary winding and secondary winding are 220/110V. 13.7/27.3A. Fundamental characteristics are obtained through short circuit and no load test. The over load capability and characteristics are investigated.

• Journal of Advanced Marine Engineering and Technology
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• v.24 no.6
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• pp.34-42
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• 2000

In this paper conventional technique will be described, which can be used for the measuring various parameters of induction motor. This is followed by presenting some other, alternative, techniques. The two tests are described which are suitable to obtain the electrical parameters of symmetrical 1hp three-phase squirrel-cage induction motor. These are the blocked rotor test and no load test. By the application of these, it is possible to determine the parameters which are presented in the steady-state equivalent-circuit of determining an induction motor. One conventional method of determining the inertia of an induction motors is obtained by performing retardation tests. The angular rotor speed of the motor is monitored, following its disconnection from the stator supply. Since the inertia torque J dw/dt contains the inertia coefficient J and the friction and windage torque Bw contains the coefficient B, then J and B can be determined by performing retardation tests.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.516-517
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• 2013

신재생 에너지의 비중 확대와 보급이 늘어남에 따라, 국가 간, 도시 간의 송전이 중요한 이슈로 대두 되고 있다. 위와 같은 요구 조건을 만족시키기 위해서 초고압 직류 송전의 개발이 필요하다. 초고압 직류송전(HVDC)에는 전류형과 전압형으로 나뉘는데. 각 HVDC에서 사용되는 Valve는 실제 운전 전에 여러 가지 방법으로 검증이 필요하다. 합성 시험회로 설비(Synthetic Test Circuit = 이하 STC)는 전류형 HVDC에서 사용되는 주요 전력변환 장치로, Thyristor Valve의 동작을 실제 동작 조건에 맞추어 동작을 시켜, 동작의 신뢰성을 검증하는 시험 설비이다. 본 논문에서는 전류형 HVDC Valve의 Operational Test를 위한 STC의 보호기능에 대해 기술하고 있다. 합성시험회로는 2상 초퍼와 6 펄스 사이리스터 컨버터를 사용하였고 설계된 보호기능은 PSCAD를 사용하여 검증하였다. HVDC Valve Operational Test시 합성시험회로 내에서 발생할 수 있는 사고 상황을 상정하고 그에 따른 보호 기능을 모의하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.5
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• pp.885-892
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• 2017

In this paper, we proposed a novel crowbar circuit for high-speed discharge charge switching to solve discharge charge-time delay of supply voltage in the conventional crowbar circuit. The proposed circuit is designed to increase the charge-speed after high-speed discharge of supply voltage, thereby reducing the time exposed to radiation damage and, the normal operation time of electronic system after passing the pulse radiation. The simulation of the discharge charge-times before the implement of the hardware is conducted using Cadence's pspice tool, and DUT (Device Under Test) board is fabricated in the device level. The comparison measurement of the crowbar circuits is performed on the satellite-electronic device for 24V. As the result, we confirmed the high-speed function of the proposed circuit by improvement of the discharge-speed 96.8% and the charge-speed 27.3% as compared with the conventional circuit.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.1
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• pp.125-130
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• 2007

Single-phase is used widely power of field of appliance because can use commercialized power directly without power transform. Specially, because condenser nu-drive style single-phase induction motor efficiency is excellent, and most suitable in embodiment as economical. It is established true that method by crossing self-discipline and method by revolving magnetic field are interpretation of net single-phase induction motor, but method to calculate electric motor inside proper move in existent theory or method is some complex. That arbor in the law of circuit constant that combine equivalent circuit law with numerical analysis law according to development of the latest computer or microprocessor is suggested and does the calculation processing fast and correct. In this paper, measurement wishes to present method that calculate after calculate digital measurement that measures correctly and measures impossible the first and the second leakage reactance and no-load test locked-rotor test, DC test and resistance measurement of stator winding in circuit parameter calculation program that is had for MatLab program individually in single-phase power.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.64 no.3
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• pp.130-137
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• 2015

This study is about the controller development of the Electric Operating Cell(EOC) which will replace the Mechanical Operated Cell(MOC) of the vacuum circuit breaker which has been used in the power plant and the performance test for the developed controller. The controller developed through this study was manufactured considering the harsh installation environment and electrical condition of the power plant, and the controller performance certification test for confirming the product reliability was taken to know whether or not to withstand fully in various electrical and mechanical problems. Items for performance certification test were AC power frequency voltage withstand test, combined surge immunity test, 1 [MHz] oscillatory SWC test, fast transient SWC test, radiated electromagnetic interference test, vibration test. As a result, all tests has passed an examination without malfunction.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.357-360
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• 2000

This paper describes a parameter extraction method for HBT(Heterojunction Bipolar Transistor) equivalent circuit model without measurements of special test structures or numerical optimizations. Instead, all equivalent circuit parameters are calculated analytically from small-signal S-parameters measured under different bias conditions. These values being extracted from the cutoff mode can be used to extract intrinsic parameters at the active mode. This method yields a deviation of about 1.3 % between the measured and modeled S-parameters.

• ETRI Journal
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• v.8 no.1
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• pp.44-52
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• 1986

The main features of HILO-3 logic simulator are introduced. It is regarded as one of the most powerful logic simulator available now in electronic industry. The major functions and concepts are reviewed with some examples; circuit description using HDL (Hardware Description Language), waveform description using WDL (Waveform Description Language) and fault-free simulation for static RAM circuit. This program is expected to help the system designers, integrated circuit designers and test engineers.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.147-150
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• 2002

This paper describes the work performed by computer simulation to achieve a satisfactory method of predicting the short circuit withstand strength of transformer which, may be too big for test due to physical or economic reasons. In fact, the windings of power transformer are subjected to extremely severe stresses under short-circuit condition. From our work, however, were computed such stresses as buckling, tending and compression occurring in transformer windings.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.40 no.7
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• pp.474-480
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• 2003

We designed and tested a new scan driver output stage. Compared to conventional CMOS structured scan driver IC′s, the new NMOSFET-only scan driver circuit can reduce the chip area and therefore, the chip cost considerably. We confirmed the circuit operation with open drain power NMOSFET IC′s by driving 2"PDP test panel. We defined critical device parameters and their optimization methods lot the best circuit performance.