負荷壓力 피이드 백을 이용한 電氣-油壓 서어보系의 角荷變動 補償에 관한 硏究 : 부하압력 피이드 백을 이용한 전기-유압 서어보계의 각하변동 보상에 관한 硏究

김종겸 釜山大學校 工科大學 1989 工科大學 硏究 報告 Vol.38 No.-

유도전동기 기동시 전압강하와 변압기 용량 및 임피던스에 관한 연구

김종겸 대한전기학회 2022 전기학회논문지 Vol.71 No.4

Induction motors have the disadvantage of generating a voltage drop due to a high current during startup. This voltage drop may have a bad effect on other loads, so the voltage drop must be reduced within a certain range. The improvement of the starting method is also important to reduce the voltage drop, but the contents of the transformer's capacity and percent impedance are also very important. Transformers have different percent impedance depending on their capacity and voltage. The percent impedance is also related to the voltage drop. The higher the capacity of the transformer, the higher the percent impedance, and the lower the capacity, the lower the percent impedance. In this study, in order to limit the voltage drop to within the allowable range when starting the induction motor directly, the transformer capacity was calculated by considering the percent impedance together.

1선 지락 사고시 배전선로 접지저항에 따른 유도전동기 토크 특성 변화에 관한 연구

김종겸 대한전기학회 2022 전기학회논문지 Vol.71 No.10

Customers should be provided with good quality of electricity for stable load operation. Various failures can occur from substations and distribution lines to consumers. The most common failure in distribution lines is single-line ground fault. For distribution lines, grounding resistance is stipulated according to the length of the line and installation conditions. When single-line ground fault occurs, the magnitudes and phase angles of voltage and current change asymmetrically, resulting in unbalance. Three-phase induction motors among customer facilities are greatly affected by these voltage and current imbalances. Imbalance of current and voltage caused by a fault can have a great effect on the torque of the motor. In this study, we analyzed how the pulsating torque of an induction motor appears according to the ground resistance of the line during single-line ground fault in a distribution line. It was confirmed that the higher the ground resistance of the distribution line, the lower the amplitude of the pulsating torque.

50 마력 유도기의 전동기 운전 및 발전기 운전시의 특성 분석

김종겸 대한전기학회 2022 전기학회논문지 P Vol.71 No.3

The induction machine can be operated with a motor or a generator before and after the synchronous speed. The induction machine uses the same equivalent circuit diagram for both the motor and the generator. Therefore, the value obtained through the factory test can be applied as a parameter of the same equivalent circuit diagram. The output of the induction motor corresponds to 100% operation of the load connected to the shaft at the rated rotation speed, but the output of the induction generator corresponds to the active power obtained through the stator by mechanical input to the shaft. Therefore, even with the same equivalent circuit, the efficiency may be different because the electric power is different when operating with a motor or a generator. In this study, we analyzed the efficiency with input power by voltage and current and mechanical output by angular speed and torque when driving a motor with a 50㏋ induction machine, and also the efficiency of stator electrical output for mechanical input during generator operation also analyzed.

수로식 마이크로 수력설비 구축에 대한 고찰

김종겸 대한전기학회 2022 전기학회논문지 P Vol.71 No.1

As the importance of de-carbonization increases, interest in the development of clean energy is gradually expanding. New and renewable energy is the basis of clean energy. Among renewable energies, the oldest, well-established energy conversion technology, and the highest efficiency is hydroelectric energy. Hydropower is classified into large hydropower, medium hydropower, small hydropower, micro hydropower, and pico hydraulic power according to the power generation output. In the case of Korea, the target of output that can still be developed is micro-scale hydropower. In particular, there are many places in the small rivers and mountainous areas where the water of the rivers flowing through the road can be used. In such a place, it is possible to construct a run of river type power generation facility. In order to expand the supply of micro hydroelectric power generation, there are various considerations during construction. Intake weir and a water tank are required to secure a certain amount of water, a hydraulic tube is required to convert this into potential energy, and water turbine is required to convert potential energy into kinetic energy. In order to convert mechanical energy due to aberration into electrical energy, a generator is required. In this paper, we introduce a method for reducing construction cost and convenient maintenance without changing the flow of water through the change of the waterway type compared to the existing run of river type hydroelectric power generation.

역률 변화에 따른 유도전동기의 기동 특성 해석

김종겸,박영진,김일중 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.3

컨베이어 벨트용 유도전동기의 전압강하 및 역률에 관한 연구

김종겸,박영진 한국조명.전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.3

In the logistics system, a conveyor system that converts linear motion into rotational motion is widely applied. Induction motors are mainstream in the operation of these conveyor systems. The conveyor uses a deceleration device to make the conveying speed of the object proper. The load of the conveyor connected to the speed reducer is generally lower than that of the motor. Conveyor installations are usually located far from the power supply, so the voltage drop is high. If the voltage drop is high when power is supplied to the load, the current will increase and the conductor will generate more heat than specified. In this study, we proposed a method to solve various problems such as heat generation and power factor compensation when the power factor is lowered and the voltage drop is high when operating at a lower value than the specified load condition.

1,500 ㎾ 유도발전기를 배전선로에 연결할 때 발생하는 전압강하에 대한 분석

김종겸 대한전기학회 2022 전기학회논문지 Vol.71 No.9

Induction generators, like induction motors, have a disadvantage in that a voltage drop occurs due to a high current during starting. Induction generators are often connected to the ends of distribution lines. When the induction generator is started and connected to the distribution line through the generated transformer, a voltage drop occurs in the distribution line as well as the transformer terminals. When an induction generator is applied to a hydroelectric power plant, it is necessary to accurately consider substations, distribution lines, loads, transformers for generators, and induction generators to know whether the voltage drop allowed by the system is satisfied. In this paper, we analyzed the application of induction generators with accurate data on substations, underground and overhead distribution lines, customer loads, transformers, and generators for power plants currently installed and operating in Korea. As a result of the analysis, the voltage drop was high in the premises of the power plant, but the voltage drop was low in the distribution line, confirming that it is possible to apply the induction generator to the distribution line.

유도전동기를 발전기로 운전할 경우 동작 특성 분석

김종겸,박영진,류연수,김영국 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4

In small-scale hydroelectric power plants, the induction generator and synchronous generator has been used a lot. The case of synchronous generator, that can be applied to if the capacity is large, the case of the induction generator, has been used mainly in power generation when the output is small. Generators of small capacity have been applied primarily to small-scale hydroelectric power plant may be used as a generator to drive in more than synchronous speed induction motor. In this study, we attempt to interpret the change in the characteristics that occur when operating in the induction generator based on the parameters that have been designed and manufactured as an induction motor.

진공차단기 써지 특성 해석

김종겸,김일중 한국조명·전기설비학회 2012 한국조명·전기설비학회 학술대회논문집 Vol.2012 No.10

진공차단기는 산업현장에서 고압 설비의 전원 개폐장치로서 가장 많이 사용되고 있다. 이 차단기는 개폐시 발생하는 아크를 소호하는 과정에서 높은 급준파 써지전압이 발생할 수 있다. 이 급준파 써지전압이 전동기의 권선에 전달될 경우 권선 절연 열화로 이어져 전동기의 절연파괴와 소손의 주요 원인으로 작용하고 있다. 그래서 중요 설비에서는 차단기 2차측 또는 전동기 입구단에 써지 저감장치를 사용하고 있다. 본 연구에서는 차단써지의 크기를 분석하고 이 써지전압의 크기에 대해 ZnO 소자를 가진 써지 흡수기와 RC 성분으로 이루어진 써지흡수기를 차단기 2차측과 전동기 입구단에 설치할 경우 써지전압의 크기 변화를 분석하였다.