Su-Yeon Choi's research while affiliated with Korea Maritime and Ocean University and other places
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Publications (12)
This paper focuses on the frequency analysis of acoustic signals produced by partial discharges (PDs) in insulation oil and the positioning of the PD occurrence for application in the diagnosis of oil-insulated transformers. Three types of electrode systems; the needle–plane, the plane–plane, and the wire–wire structures were assembled to simulate...
The object of this paper is to acquire the data related to insulation evaluation of hybrid vehicle traction motors. We made a comparative analysis on Insulation Resistance (IR), Dielectric Absorption Ratio (DAR), and Polarization Index (PI) of the motor stators. The experiment was carried out according to IEEE Std. 43 and IEC 60085-1 for insulation...
This paper dealt with the frequency analysis of acoustic signals generated by partial discharge (PD) in insulation oil and the positioning of PD occurrence to apply in the diagnosis of oil insulated transformers. We assembled three types of electrode system; the needle-plane, the plane-plane, and the floating to simulate partial discharge in insula...
This paper dealt with the detection algorithm of series arcing, which is a cause of electric fires in low-voltage wiring systems. To find the distinguished electrical features of series arc, we simulated series arcing by the arc generator specified in UL1699. An electric heater, an inverter-controlled vacuum cleaner, and a phase-controlled incandes...
In this paper, we studied on the detection of series arcing which is a main cause of electrical fires in low-voltage indoor wiring system. To distinguish series arcing state from normal one, we proposed a detection method based on that the magnitude of arc voltage included in AC voltage varies at random during series arcing. We designed and fabrica...
An objective of this paper is to develop a partial discharge (PD) measurement device for monitoring gas insulated switches installed in power distribution system. A capacitive voltage probe was studied and designed to detect PD pulse without an electrical connection. The PD measurement device consists of the capacitive voltage probe attached outsid...
Lightning warning system plays an important role in protecting human life and other facilities from lightning return strokes. This paper dealt with lightning positioning algorithms and circuits as a main function of lightning warning system, which monitor movements and activities of thunderclouds. Electric field component produced by lightning disc...
Recently, ubiquitous sensor network(USN) techniques have been applied to electric power facility management. This paper dealt with the designed and fabricated ubiquitous sensors which monitor transformers and lightning arresters installed in overhead distribution systems. The sensors consist of a 8-[bit] microprocessor unit, a wireless communicatio...
This paper dealt with the frequency spectrum analysis of acoustic signal produced by partial discharge (PD) in insulation oil and the positioning of PD occurrence to apply in diagnosis of oil insulated transformers. Three types of electrode system ; the needle-plane, the plane-plane, and the wire-wire structure were assembled to simulate partial di...
This paper described the measurement of acoustic signal generated by partial discharge in insulation oil and analysis of their frequency spectrum to acquire information for diagnosing oil insulated transformers. We designed a decoupler and a low-noise amplifier to detect acoustic signals with high sensitivity. Also, three types of electrode system;...
In this paper, we simulated series arc on electric heaters, vacuum cleaners and incandescent lamps controlled by a dimmer to analyze the characteristics of series arc that causes electric fires. A high pass filter (HPF) was designed to detect arc signal only. The HPF consists of 2-stage coupling capacitors and detection impedance, and its low cut-o...
This paper dealt with the frequency analysis of acoustic signal produced by partial discharge (PD) in insulation oil and the positioning of PD occurrence to apply to diagnose oil insulated transformers. We assembled three types of electrode system; the needle-plane, the plane-plane, and the void to simulate partial discharge in insulation oil. A lo...
Citations
... Many studies have been conducted to measure and test the arc due to electrical failure. Park et al. [30] developed an algorithm to measure the series arc for preventing electrical fires. They proposed a method of measuring the AC voltage that includes the arc voltage in order to distinguish a series arc in a normal state and used a phase shift algorithm for applications with a non-linear load. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/463468760440834-1487510971786_Q64/Gyung-Suk-Kil.jpg)
... The common approaches used for PD localization based on acoustic technique are the Time Difference of Arrivals (TDOA) and Time of Arrival (TOA) [8] [9]. TOA is based on observation of first peak or the earliest point at which the amplitude of acoustic signal approaches the maximum value [10] [11][12] [13]. ...
... The frequency response of the low-noise amplifier was analyzed by the ratio of the output voltage to the sine-wave input voltage from 11 kHz to 4 MHz using a signal generator. It has a low cut-off frequency of 11 kHz and a high cut-off frequency of 4 MHz at −3 dB [25,26]. Figure 3 shows the designed low-noise amplifier with the circuit and the frequency response characteristics. ...
... Liquid insulations are widely used in high voltage equipments such as transformers and capacitors. In particular condition and due to high electric stress and the existence of defects, partial discharges may take place in the liquid insulation [2][3][4]. The appearance of partial discharges in the insulation may degrade the insulation condition. ...
... The acoustic diagnosis technology of transformer is developing continuously. At present, the main applications are noise analysis method [3][4][5][6] , acoustic emission analysis technology and ultrasonic analysis method [7] . Audible diagnosis technology is a new diagnosis technology developed in recent years. ...
