KR101471341B1 - Method for calculating grounding resistance using neutral-returning current in transmission and distribution system - Google Patents

Method for calculating grounding resistance using neutral-returning current in transmission and distribution system Download PDF

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KR101471341B1
KR101471341B1 KR1020140148373A KR20140148373A KR101471341B1 KR 101471341 B1 KR101471341 B1 KR 101471341B1 KR 1020140148373 A KR1020140148373 A KR 1020140148373A KR 20140148373 A KR20140148373 A KR 20140148373A KR 101471341 B1 KR101471341 B1 KR 101471341B1
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transmission
calculating
resistance
line
neutral
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Korean (ko)
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이상중
이진규
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서울과학기술대학교 산학협력단
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18Measuring resistance to earth, i.e. line to ground
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing

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Abstract

The present invention relates to a method for calculating valid grounding resistance of a transmission and distribution line which receives 3-phase/4 wire type power to transmit and distribute power to a reception end from a sending end. The method for calculating valid grounding resistance of a transmission and distribution line includes: receiving 3-phase/4 wire type power to distribute one phase and a neutral line, and returning a sending end current to the transmission end from the reception end when a transformed voltage is distributed into the reception end; calculating impedance of the neutral line; and calculating valid grounding resistance using the returning current and the impedance of the neutral line. The present invention may easily and exactly calculate valid grounding resistance by calculating valid grounding resistance of a transmission and distribution system by measuring a returning current through a neutral line and a transmission current.

Description

송배전 시스템에서의 회귀전류를 이용한 송배전 선로의 유효 접지저항 계산 방법 {Method for calculating grounding resistance using neutral-returning current in transmission and distribution system}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for calculating effective ground resistance of a transmission line and a transmission line using a regenerative current in a transmission /

본 발명은 송배전 시스템에 관한 것으로서, 더욱 상세하게는 송배전 시스템에서 송배전 선로의 유효 접지저항 계산 방법에 관한 것이다.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission and distribution system, and more particularly, to a method for calculating an effective grounding resistance of a transmission and distribution line in a transmission and distribution system.

일반적으로 전기, 전자 및 통신설비 기기나 송전철탑 등의 전기 설비를 설치할 경우에 대지에 접지봉을 매설하여 접지전극을 형성하고, 그 접지전극에 전기 설비를 접지시켜 감전사고 등의 안전사고나, 시설물의 손상, 잡음(Noise) 및 오동작 등이 발생되지 않도록 예방하고 있다.Generally, when installing electric equipment such as electric, electronic, telecommunication equipment, transmission tower, etc., a grounding rod is embedded in the ground to form a grounding electrode and the electric equipment is grounded to the grounding electrode, Noise, malfunction, and the like of the display device.

송배전선로의 접지전극이란 송배전계통에서 발생하는 지락사고, 절연불량 및 자연뢰 등으로 인한 이상전류를 대지로 안전하게 방전하여 전력계통의 신뢰성을 확보하고, 상기와 같은 원인으로 발생할 수 있는 사고로부터 사람들을 보호할 수 있도록 하기 위한 것이다.The grounding electrode of the transmission and distribution line is to ensure the reliability of the power system by safely discharging the abnormal current caused by the ground fault, insulation failure and natural lightning caused by the transmission and distribution system to the earth, So that it can be protected.

일반적으로 정상상태 접지저항은 측정대상 접지전극에 접지전류가 흐를 수 있도록 공급한 후, 접지전극으로 유입되는 전류값과 그로 인해 발생하는 전위 상승값을 측정하여 접지저항값을 산출하여 측정하게 된다.In general, the steady-state ground resistance is measured by measuring the current value flowing into the ground electrode and the rising value of the potential after the grounding current is supplied to the ground electrode to be measured.

접지는 전기 설비와 대지에 확실히 전기적 접속을 실현하는 것으로서 이상적으로는 접지전극의 접지저항이 0Ω이 되도록 해야 된다.Grounding is to achieve a definite electrical connection to the electrical equipment and the ground. Ideally, the grounding resistance of the grounding electrode should be 0Ω.

그러나, 대지는 흙의 입자, 물 및 공기 등으로 이루어져 있고, 접지봉은 금속으로 대지와 전기적으로 접속되는 것으로서 대지와 접지봉의 사이에는 전기적 저항 즉, 접지저항이 존재하게 된다.However, the ground consists of particles of soil, water and air, and the ground bar is electrically connected to the ground with metal, and electrical resistance, that is, ground resistance, exists between the ground and the ground bar.

그리고, 동일한 부지 내에서도 동일한 크기 및 동일한 형상의 접지봉을 상호간에 인접된 위치에 매설한 경우에도 이들의 접지저항 값은 서로 상이하게 나타나는 것으로서 접지봉을 매설하여 접지전극을 형성할 경우에 접지 저항이 미리 설정된 값 이하가 되도록 규정하고 있다. 이에 따라 최근, 접지저항을 측정하는 방법에 대한 연구가 진행 중에 있다.
Also, even when grounding rods having the same size and shape are buried in positions adjacent to each other even in the same site, their grounding resistance values are different from each other. In the case where grounding rods are embedded to form a grounding electrode, Of the total amount. Accordingly, a method for measuring the grounding resistance has been under development in recent years.

대한민국 등록특허 10-0725857Korean Patent No. 10-0725857

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 송배전 시스템에서 송배전 선로의 유효 접지저항을 용이하게 계산할 수 있는 방법을 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for easily calculating an effective ground resistance of a transmission / distribution line in a transmission / distribution system.

본 발명의 목적은 이상에서 언급한 목적으로 제한되지 않으며, 언급되지 않은 또 다른 목적들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.
The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

이와 같은 목적을 달성하기 위한 본 발명은 3상 4선식 방식의 전력을 공급받아 송전단에서 수전단으로 전력을 송배전하는 송배전 시스템에서의 송배전 선로의 유효 접지저항 계산 방법에 있어서, 상기 송전단에서 3상 4선식 방식의 전력을 수전하여 어느 한 상과 중성선(Neutral line)을 분기하여 변압된 전압을 상기 수전단에 배전할 때, 상기 송전단 전류와 상기 수전단에서 상기 송전단으로 회귀하는 회귀전류를 측정하는 단계, 상기 중성선의 임피던스를 계산하는 단계 및 상기 회귀전류와 상기 중성선의 임피던스를 이용하여 상기 송수전단의 유효 접지저항을 계산하는 단계를 포함한다. In order to accomplish the above object, the present invention provides a method for calculating an effective grounding resistance of a transmission / distribution line in a transmission / distribution system that receives and supplies power from a transmission end to a reception end in a three-phase four- And a regenerative current regenerating circuit for returning to the power supply end from the power supply end current when the transformed voltage is distributed to the preceding power supply by branching a neutral phase and a neutral phase by receiving power of an upper four- Calculating the impedance of the neutral line, and calculating the effective ground resistance of the previous transmission line using the regression current and the impedance of the neutral line.

상기 중성선의 임피던스를 계산하는 단계에서, 상기 중성선의 임피던스를 계산하고, 상기 송수전단의 유효 접지저항을 계산하는 단계에서, 상기 회귀전류와 상기 중성선의 임피던스를 이용하여 상기 송수전단의 유효 접지저항을 계산할 수 있다. Calculating the impedance of the neutral line in the step of calculating the impedance of the neutral line and calculating the effective ground resistance of the neutral point by using the impedance of the regression current and the neutral line to calculate the effective ground resistance of the neutral point, Can be calculated.

상기 송수전단의 유효 접지저항을 Rg라 하고, 상기 중성선을 통하지 않고 접지를 통해 회귀하는 전류를 Ig라 하고, 상기 중성선의 저항을 Rl이라 할 때,

Figure 112014104152035-pat00001
의 수학식으로 상기 송수전단의 유효 접지저항을 계산할 수 있다. The effective resistance of the ground water supply front end la and R g, when the current to return via the ground without passing through the neutral I g LA, and be referred to as the resistance of the neutral R l,
Figure 112014104152035-pat00001
The effective ground resistance of the previous transmission and reception can be calculated.

단,

Figure 112014104152035-pat00002
[pu]이다.
only,
Figure 112014104152035-pat00002
[pu].

본 발명에 의하면 회귀전류를 실측하여 송배전 시스템의 선로 유효 접지저항을 계산함으로써, 보다 용이하고 정확한 유효 접지저항을 계산할 수 있는 효과가 있다. 따라서, 본 발명에서는 감전사고 등의 안전사고나, 시설물의 손상, 잡음 및 오동작 등이 발생하지 않도록 예방할 수 있는 효과가 있다.
According to the present invention, it is possible to calculate the effective ground resistance more easily and accurately by calculating the effective ground resistance of the transmission and distribution system by measuring the regression current. Therefore, the present invention has an effect of preventing a safety accident such as an electric shock accident, a damage of a facility, a noise and a malfunction.

도 1은 본 발명의 일 실시예에 따른 송배전 시스템의 배전선로를 도시한 도면이다.
도 2는 본 발명의 일 실시예에 따른 송배전 시스템에서의 유효 접지저항 계산 방법을 보여주는 흐름도이다.
1 is a view illustrating a distribution line of a transmission and distribution system according to an embodiment of the present invention.
2 is a flowchart illustrating a method of calculating an effective grounding resistance in a transmission and distribution system according to an embodiment of the present invention.

본 발명은 다양한 변경을 가할 수 있고 여러 가지 실시예를 가질 수 있는 바, 특정 실시예들을 도면에 예시하고 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다.While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

본 출원에서 사용한 용어는 단지 특정한 실시예를 설명하기 위해 사용된 것으로, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 본 출원에서, "포함하다" 또는 "가지다" 등의 용어는 명세서상에 기재된 특징, 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

다르게 정의되지 않는 한, 기술적이거나 과학적인 용어를 포함해서 여기서 사용되는 모든 용어들은 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 일반적으로 이해되는 것과 동일한 의미를 갖고 있다. 일반적으로 사용되는 사전에 정의되어 있는 것과 같은 용어들은 관련 기술의 문맥 상 갖는 의미와 일치하는 의미를 갖는 것으로 해석되어야 하며, 본 출원에서 명백하게 정의하지 않는 한, 이상적이거나 과도하게 형식적인 의미로 해석되지 않는다.Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted in an ideal or overly formal sense unless expressly defined in the present application Do not.

또한, 첨부 도면을 참조하여 설명함에 있어, 도면 부호에 관계없이 동일한 구성 요소는 동일한 참조부호를 부여하고 이에 대한 중복되는 설명은 생략하기로 한다. 본 발명을 설명함에 있어서 관련된 공지 기술에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다.In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

본 발명은 3상 4선식 방식의 전력을 공급받아 송전단에서 수전단으로 전력을 송배전하는 송배전 시스템에서의 송배전 선로의 유효 접지저항 계산 방법에 대한 것이다. The present invention relates to a method for calculating an effective grounding resistance of a transmission / distribution line in a transmission / distribution system that receives and supplies power from a transmission terminal to a receiver terminal in a three-phase four-wire system.

도 1은 본 발명의 일 실시예에 따른 송배전 시스템의 배전선로를 도시한 도면이다.1 is a view illustrating a distribution line of a transmission and distribution system according to an embodiment of the present invention.

도 1에서 송배전 시스템은 송전단(100)과 수전단(200)을 포함하여 이루어진다. In FIG. 1, the transmission / distribution system includes a transmission terminal 100 and a reception terminal 200.

송전단(100)은 주상 변압기(110)와 제1 분전반(120)을 포함한다.The transmission terminal 100 includes a pillar transformer 110 and a first distribution panel 120.

수전단(200)은 제2 분전반(210)을 포함한다. The receiving end 200 includes a second distribution board 210.

도 1은 어느 지역의 22.9kV/380V 주상 변압기(110)로부터, 제1 분전반(120)을 통하여 3상 4선 방식의 380V를 수전하고, 그 중 한 상과 중성선(Neutral line)을 분기하여 약 600 m 떨어진 수전단(200)에 220V를 공급하는 배전선로를 도시한 도면이다. 주상 변압기(110)와 제1 분전반(120)은 정해진 규정에 따라 접지되어 있다. FIG. 1 shows a three phase four-wire system of 380 V from a 22.9 kV / 380 V pillar-form transformer 110 through a first distribution panel 120, and one of the three phases is connected to a neutral line And a power distribution line for supplying 220 V to the power receiving end 200 at a distance of 600 m. The pillar transformer (110) and the first distribution panel (120) are grounded according to prescribed regulations.

수전단(200) 부하의 대부분은 조명 부하이고, 일부는 음향장치 부하이다. 수전단(200) 지점의 전신주에서 접지봉을 이용하여 중성선(Neutral line)을 접지하고, 수전단(200)의 제2 분전반(210)과 부하(조명등 외함, Amp 부하)가 접지봉을 통하여 접지되어 있다.Most of the load front stage 200 load is the lighting load, and some is the sound system load. A neutral line is grounded using a grounding bar at a power pole of the power receiving end 200 and the second power distributing panel 210 of the power receiving end 200 and a load such as a lighting lamp enclosure and an Amp load are grounded via a ground bar .

본 발명에서는 송전단(100)의 송전전류와 제1 분전반(120)으로 회귀하는 중성선 전류의 실측을 통하여 220 V 선로의 유효 접지저항을 계산하고자 한다.
In the present invention, the effective ground resistance of the 220 V line is calculated through actual measurement of the transmission current of the transmission terminal 100 and the neutral line current returning to the first distribution board 120.

표 1은 2013년 10월 10일 22시 35분에 송전단(100)의 전류와 중성선으로 회귀하는 전류를 측정한 결과이다. Table 1 shows the results of measuring currents flowing back to the transmission line (100) and the neutral line at 22:35 on October 10, 2013.

Hot line [A]Hot line [A] Neutral [A]Neutral [A] DifferenceDifference 1One 11.9411.94 11.5311.53 0.410.41 22 12.0312.03 11.5011.50 0.530.53 33 11.8011.80 11.3011.30 0.500.50 평균Average 11.9611.96 11.4811.48 0.480.48

표 1을 참조하면, 조명부하를 100% 가까이 사용하고 있으며, 음향기기도 온(on)된 상태이다. 측정 결과, Neutral current 가 Hot line 에 비해 480 mA 정도 적음을 알 수 있다. 이는 4 % 정도의 전류가 대지를 통하여 회귀하고 있음을 의미한다.
Referring to Table 1, the lighting load is used close to 100%, and the sound device is also turned on. As a result, it can be seen that the Neutral current is about 480 mA less than the hot line. This means that about 4% of the current is returning through the earth.

도 2는 본 발명의 일 실시예에 따른 송배전 시스템에서의 유효 접지저항 계산 방법을 보여주는 흐름도이다. 2 is a flowchart illustrating a method of calculating an effective grounding resistance in a transmission and distribution system according to an embodiment of the present invention.

도 2를 참조하면, 송전단(100)에서 3상 4선식 방식의 전력을 수전하여 어느 한 상과 중성선(Neutral line)을 분기하여 변압된 전압을 수전단(200)에 배전할 때, 송전단 전류와 수전단(200)에서 송전단(100)으로 회귀하는 회귀전류를 측정한다(S210).Referring to FIG. 2, when power is supplied from the power feeding terminal 100 to a three-phase four-wire system to branch a neutral line and a neutral line to distribute the transformed voltage to the receiving end 200, Current and the regression current returning from the receiving end 200 to the transmitting end 100 are measured (S210).

그리고, 중성선의 임피던스를 계산한다(S220).Then, the impedance of the neutral line is calculated (S220).

그리고, 회귀전류와 중성선의 임피던스를 이용하여 송수전단의 유효 접지저항을 계산한다(S230). Then, the effective ground resistance of the previous stage is calculated using the impedance of the regression current and the neutral line (S230).

S230 단계의 중성선의 임피던스를 계산하는 단계에서, 중성선의 임피던스를 계산하고, S230 단계의 송수전단(200)의 유효 접지저항을 계산하는 단계에서, 회귀전류와 중성선의 임피던스를 이용하여 송수전단의 유효 접지저항을 계산할 수 있다.In the step of calculating the impedance of the neutral line in step S230, the impedance of the neutral line is calculated. In the step of calculating the effective ground resistance of the transmitting and receiving stage 200 in step S230, the impedance of the regenerative current and the neutral line is used to calculate the effective The ground resistance can be calculated.

송수전단의 유효 접지저항을 Rg라 하고, 접지저항을 통하여 흐르는 전류를 Ig [pu]라 하고, 중성선의 저항을 Rl이라 할 때, 다음 수학식과 같은 관계가 성립한다. When referred to the effective resistance of the ground water supply shear R g and be referred to as a current flowing through the ground resistance I g [pu] la, and R l of the neutral resistor, the following is established a relationship such mathematical expressions.

Figure 112014104152035-pat00003
Figure 112014104152035-pat00003

수학식 1을 유효 접지저항 Rg에 대해 정리하면 다음과 같다. Equation 1 can be summarized as follows with respect to the effective ground resistance R g .

Figure 112014104152035-pat00004
Figure 112014104152035-pat00004

본 발명에서는 수학식 2를 이용하여 송수전단의 유효 접지저항을 계산할 수 있다.In the present invention, it is possible to calculate the effective ground resistance at the previous stage of transmission and reception using Equation (2).

예를 들어, 표 1을 이용하여 송수전단의 유효 접지저항의 크기를 계산하는 과정을 설명하면 다음과 같다. For example, the process of calculating the effective ground resistance of the previous stage of transmission and reception using Table 1 will be described.

중성선을 통한 회귀전류를 실측한 결과로부터, Ig=0.04 [pu]를 얻는다. I g = 0.04 [pu] is obtained from the result of measuring the regression current through the neutral line.

따라서,

Figure 112014104152035-pat00005
의 관계를 얻을 수 있다.therefore,
Figure 112014104152035-pat00005
Can be obtained.

송전단(100)와 수전단(200)의 거리가 600 m 이고, 중성선은 38 mm2 경동선(0.502Ω/km)을 사용한다고 하면, 중성선의 저항 Rl은 약 0.3012 Ω이 된다.Assuming that the distance between the power feeding end 100 and the receiving end 200 is 600 m and the neutral line is 38 mm 2 tilting line (0.502? / Km), the resistance R 1 of the neutral line is about 0.3012?.

따라서, 송전단(100)의 접지공사, 수전단(200)의 전주에 시공된 봉접지, 송수전단의 분전반 접지 및 부하(조명, 음향, 기타설비)의 개별접지를 합한 합성 유효 접지저항은, Therefore, the combined effective grounding resistance, which is the sum of the grounding work of the power feeding end 100, the rod ground installed on the front end of the power receiving end 200, the distribution board ground of the transmitting and receiving end and the individual grounding of the load (illumination, sound,

Figure 112014104152035-pat00006
Figure 112014104152035-pat00006

로 추정할 수 있다.
.

이상 본 발명을 몇 가지 바람직한 실시예를 사용하여 설명하였으나, 이들 실시예는 예시적인 것이며 한정적인 것이 아니다. 본 발명이 속하는 기술분야에서 통상의 지식을 지닌 자라면 본 발명의 사상과 첨부된 특허청구범위에 제시된 권리범위에서 벗어나지 않으면서 다양한 변화와 수정을 가할 수 있음을 이해할 것이다.
While the present invention has been described with reference to several preferred embodiments, these embodiments are illustrative and not restrictive. It will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention and the scope of the appended claims.

100 송전단 110 주상 변압기
120 제1 분전반 200 수전단
210 제2 분전반
100 Transformer 110 pole transformer
120 1st distribution board 200 number of sheets
210 The second distribution board

Claims (3)

3상 4선식 방식의 전력을 공급받아 송전단에서 수전단으로 전력을 송배전하는 송배전 시스템에서의 송배전 선로의 유효 접지저항 계산 방법에 있어서,
상기 송전단에서 3상 4선식 방식의 전력을 수전하여 어느 한 상과 중성선(Neutral line)을 분기하여 변압된 전압을 상기 수전단에 배전할 때, 송전단전류 및 상기 수전단에서 중성선을 통해 상기 송전단으로 회귀하는 회귀전류를 측정하는 단계;
상기 중성선의 임피던스를 계산하는 단계; 및
상기 회귀전류와 상기 중성선의 임피던스를 이용하여 상기 송수전단의 유효 접지저항을 계산하는 단계
를 포함하는 송배전 시스템에서의 송배전 선로의 유효 접지저항 계산 방법.
A method of calculating an effective grounding resistance of a transmission / distribution line in a transmission / distribution system that receives power from a three-phase four-wire system and transmits /
Wherein when the transformed voltage is supplied to the preceding power stage by branching one phase and the neutral line by receiving the power of the three-phase four-wire type at the power feeding end, Measuring a regression current returning to the power feed end;
Calculating an impedance of the neutral line; And
Calculating an effective ground resistance of the previous transmission and reception using the regression current and the impedance of the neutral line
And calculating the effective ground resistance of the transmission / distribution line in the transmission / distribution system.
청구항 1에 있어서,
상기 중성선의 임피던스를 계산하는 단계에서, 상기 중성선의 임피던스를 계산하고,
상기 송수전단의 유효 접지저항을 계산하는 단계에서, 상기 회귀전류와 상기 중성선의 임피던스를 이용하여 상기 송수전단의 유효 접지저항을 계산하는 것을 특징으로 하는 송배전 시스템에서의 송배전 선로의 유효 접지저항 계산 방법.
The method according to claim 1,
Calculating an impedance of the neutral line, calculating an impedance of the neutral line,
Calculating an effective ground resistance of the transmission / distribution system in the transmission / distribution system using the impedance of the regenerative current and the neutral line in calculating the effective ground resistance of the transmission / reception front end .
청구항 2에 있어서,
상기 송수전단의 유효 접지저항을 Rg라 하고, 상기 접지저항을 통하여 흐르는 전류를 Ig라 하고, 상기 중성선의 저항을 Rl이라 할 때,
Figure 112014104152035-pat00007

의 수학식으로 상기 송수전단의 유효 접지저항을 계산할 수 있는 것을 특징으로 하는 송배전 시스템에서의 송배전 선로의 유효 접지저항 계산 방법.
The method of claim 2,
The effective resistance of the ground water supply shear R g LA, and the current flowing through said ground resistance I g LA, and when the resistance of the neutral conductor to be referred to as R l,
Figure 112014104152035-pat00007

And calculating the effective ground resistance of the transmission / distribution line in the transmission / distribution system.
KR1020140148373A 2014-10-29 2014-10-29 Method for calculating grounding resistance using neutral-returning current in transmission and distribution system KR101471341B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240076083A (en) 2022-11-23 2024-05-30 한국전력공사 System and Method for analyzing real time effective ground by distributed generation and load characteristics

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60155981A (en) * 1984-01-25 1985-08-16 Toyo Commun Equip Co Ltd Insulation resistance measurement
JPH05157783A (en) * 1991-05-21 1993-06-25 Merlin Gerin Apparatus for monitoring and measuring insulation of power supply system
JPH09284984A (en) * 1996-04-08 1997-10-31 Mitsubishi Electric Corp Ground detection circuit and circuit breaker having ground detection circuit
JPH09304453A (en) * 1996-05-17 1997-11-28 Mitsubishi Electric Corp Simple measuring equipment and method for impedance of low voltage distribution line

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60155981A (en) * 1984-01-25 1985-08-16 Toyo Commun Equip Co Ltd Insulation resistance measurement
JPH05157783A (en) * 1991-05-21 1993-06-25 Merlin Gerin Apparatus for monitoring and measuring insulation of power supply system
JPH09284984A (en) * 1996-04-08 1997-10-31 Mitsubishi Electric Corp Ground detection circuit and circuit breaker having ground detection circuit
JPH09304453A (en) * 1996-05-17 1997-11-28 Mitsubishi Electric Corp Simple measuring equipment and method for impedance of low voltage distribution line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240076083A (en) 2022-11-23 2024-05-30 한국전력공사 System and Method for analyzing real time effective ground by distributed generation and load characteristics

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