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김태훈(Tae-Hoon Kim),박준열(Jun-Yeal Park) 대한전기학회 2014 전기학회논문지 Vol.63 No.7
As the various kinds of load who generate higher harmonics increases according as the power electronics technology develops, harmonic treatment standard is proposed by IEEE and IEC. Because establishment of harmonic reduction device is required for existent installment to satisfy harmonic treatment standard, the problem of investment charge and installation space increasing may be occurred. In order to solve these problems, a novel transformer connection method using principles of PCT and ZED is suggested.
모선 및 TR Bank 구성방식에 따른 TRV 특성에 관한 연구
조계술(Kyeh-Sool Cho),최홍규(Hong-Kyoo Choi),박준열(Jun-Yeal Park),서범관(Beom-Gwan Seo),조시현(Shi-Hyun Cho),장래창(Rae-Chang Jang),이강수(Kang-Soo Lee) 한국조명.전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
전력설비의 고장 시 신속하고 안전하게 고장회로를 분리하기 위한 차단기는 선정 시 고장전류의 크기와 함께 과도회복전압(TRV : Transient Recovery Voltage)이 검토되어야 한다. 차단기별 적합한 과도회복전압(TRV)의 평가는 과도회복전압파고치(U0)와 초기상승률(RRRV)를 검토하여야 하며, 국제적으로 IEC 62271-100 기준에 따른다. 본문에서는 전압 22.9[㎸], 수전용량 6[MVA]의 설비를 기준으로 Cable의 길이변화, 변압기의 Bank 구성방식, 계통 구성방식을 달리하여 과도회복전압(TRV)의 발생 유형 및 특성을 검토하였으며, IEC 62271-100기준과 비교 검토하였다.
김종수(Jong-Soo Kim),최홍규(Hong-Kyoo Choi),박준열(Jun-Yeal Park),심용식(Yong-Sik Shim),김태훈(Tae-Hoon Kim),신혜영(Hye-Young Shin) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
Grounding electrodes with higher burial depths are evaluated to have better performance, due to the domestic practice that puts the grounding resistance as the standard of performance evaluation, while grounding resistance decreases as the burial depth increases. However, the performance evaluation of mesh grounding electrodes for uses in power stations and substations should include not only grounding resistance but also the dangerous voltage(mesh voltage and step voltage) in precaution towards the increase of land-voltage at the occurrence of ground-fault. This article investigates on the changes in grounding resistances and dangerous voltage(mesh voltage and step voltage) according to the changes in burial depths of mesh grounding electrode.
朴俊烈 嶺南大學校 工業技術硏究所 1977 연구보고 Vol.5 No.1
The work trip characteristics of an area were an industrial complex is developed are investigated in termsl of work trip pattern and the balance between work trip volume and person trip volume within the area. a. Work Trip Pattern The area where the workers are distributed is divided into 5 zones, A through E, according to seven governing factors. Person-Kilometers are calculated as the Products of the numbers of workers living in the given zones and the average trip distances between the zones and the site of industry, and are grouped for comparison, which defines the work trip pattern: Concentrated type, where the sum A+B dominates Close dispersed type, when the sum C+D prevails Urban dispersed type, E being the largest. The first type is the most preferred as a work trip pattern; the last type causes work trip problems. b. Balance between work trip volume and person trip volume The following formula is proposed to define a balanced model: F=( P₁L₁+βP₂L₂t₁/t₂)(t₂- t₁) / αt₁{P₂L₂(1-βt₁/t₂)+P₃L₃} Where P₁: Work trip volume per mode of transit L₁: Average work trip distance P₂: Person trip volume per mode of transit L₂: Average person trip distance P₃: Workers' non-work trip volume and L₃: Workers' non-work trip distance t₁: Length of time period work trips occur t₂: Length of time period person trips occur α : Ratio of overloading of transit media during work trip hours β : Ratio of portion of person trips during work trip hours The value of F given by the formula above indicates the balancing of the two types of trip: F≤1: The development of transit media appropriate for person trips also remedies work trip problems F>1: The development of transit media appropriate for person trips does not remedy work trip problems; ones suitable for the latter result in the idling of such systems during non-worktrip hours. The above two define the work trip characteristics of an industrially built-up area. The basic solution of work trip problems within such an area consists in the determination of the optimal size of the area's population, which may be given by the following formulla: P = Pi+(P₂-P₂´)γ/ P₂= K₁P₁L₁(t₂-t₁)-αt₁K₁P₃L₃/ L₂{t₁(α- β) + β(t₁²/t₂ (1-α)} where all the symbols are as defined above, except the following: P : Future population in the area Pi : Number of workers who will remain in the area γ : Rate of future traffic volume generated by population in the area K₁: Rate of increase in the number of workers P₂´: Future trafic volume facreated by people in the neighborhood The application of the preceding propositions to Kumi Industral Complex has given an indication of their validity.