역률각 θ항이 없는 수정된 등가저항법 공식을 이용한 배전선로의 전압계산 (Voltage Calculation of Distribution Line Using Modified Equivalent Resistance Method with no Angle θ Terms)

서지정보

· 발행기관 : 한국조명.전기설비학회
· 수록지 정보 : 조명.전기설비학회논문지 / 37권 / 5호 / 53 ~ 61페이지
· 저자명 : 김주철, 이상중

초록

The ‘Equivalent resistance method’ has been used in the field for a very long time to calculate the voltages in distribution power systems. IEC 60364 standard also recommends this method because it yields an approximate but a fairly reliable solution using a scientific calculator. Cosθ and sinθ terms of the complex line current are included in the ‘Equivalent resistance method’, however, the authors found out that there is an overlapping calculation between the magnitude of line current and its values of cosθ, sinθ. This paper proposes a modified formula in which the cosθ and sinθ terms included in the conventional formula are eliminated. An example calculation for a distribution line with two load points is illustrated to compare the results by modified formula with those by conventional formula, by which we can see the effectiveness of the proposed formula. It is expected that the simplified formula with no θ terms could help electrical engineers calculate the voltages of distribution power systems in a more convenient way using a scientific calculator.

영어초록

The ‘Equivalent resistance method’ has been used in the field for a very long time to calculate the voltages in distribution power systems. IEC 60364 standard also recommends this method because it yields an approximate but a fairly reliable solution using a scientific calculator. Cosθ and sinθ terms of the complex line current are included in the ‘Equivalent resistance method’, however, the authors found out that there is an overlapping calculation between the magnitude of line current and its values of cosθ, sinθ. This paper proposes a modified formula in which the cosθ and sinθ terms included in the conventional formula are eliminated. An example calculation for a distribution line with two load points is illustrated to compare the results by modified formula with those by conventional formula, by which we can see the effectiveness of the proposed formula. It is expected that the simplified formula with no θ terms could help electrical engineers calculate the voltages of distribution power systems in a more convenient way using a scientific calculator.

참고자료

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