KR100918515B1 - Method for measuring earth resistance of a single ground in active state - Google Patents

Method for measuring earth resistance of a single ground in active state Download PDF

Info

Publication number
KR100918515B1
KR100918515B1 KR1020090002278A KR20090002278A KR100918515B1 KR 100918515 B1 KR100918515 B1 KR 100918515B1 KR 1020090002278 A KR1020090002278 A KR 1020090002278A KR 20090002278 A KR20090002278 A KR 20090002278A KR 100918515 B1 KR100918515 B1 KR 100918515B1
Authority
KR
South Korea
Prior art keywords
ground
resistance
electrode
grounding
measuring
Prior art date
Application number
KR1020090002278A
Other languages
Korean (ko)
Inventor
조승기
임창희
조상범
Original Assignee
조승기
조상범
주식회사 테스트파워
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 조승기, 조상범, 주식회사 테스트파워 filed Critical 조승기
Priority to KR1020090002278A priority Critical patent/KR100918515B1/en
Application granted granted Critical
Publication of KR100918515B1 publication Critical patent/KR100918515B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE: A method measuring ground resistance of single ground for an auxiliary electrode is provided to measure the ground resistance of single ground electrode in an active state without separating the ground electrode and a protection apparatus. CONSTITUTION: A method measuring the ground resistance of the single ground is as follows. The single electrode is contacted by connecting to the ground line of low voltage line(S302). The earthed line of 220V convenience outlet is used as the ground conductor of the low voltage line. The ground conductor of the low voltage cable is installed in the power of the earth leakage breaker installed in the low voltage cable. The earth resistance of the single ground in which becomes the hook earth tester with the multiple earth is measured.

Description

단독접지의 접지저항을 측정하는 방법{METHOD FOR MEASURING EARTH RESISTANCE OF A SINGLE GROUND IN ACTIVE STATE}METHOD FOR MEASURING EARTH RESISTANCE OF A SINGLE GROUND IN ACTIVE STATE}

본 발명은 접지저항 측정방법에 관한 것으로서, 특히 보조전극을 타입 할 필요 없이 용이하게 단독접지저항을 측정하는 방법에 관한 것이다.The present invention relates to a method for measuring ground resistance, and more particularly, to a method for easily measuring a single earth resistance without having to type an auxiliary electrode.

전기설비에서 감전사고와 전력설비의 재해를 방지하기 위하여 접지 공사를 시행하고 있다. 그러나 접지개소의 경연 열화로 접지저항이 규정치를 초과하게 되면 안전사고의 위험이 있으므로 전기설비기술기준에 정기적으로 전기설비에 따라서 2-5년/회씩 접지저항을 측정하도록 되어 있다. In order to prevent electric shock accidents and disasters in electric power facilities, grounding works are being carried out. However, if the ground resistance exceeds the specified value due to deterioration of the grounding point, there is a risk of safety accident. Therefore, the ground resistance should be measured every 2-5 years / time according to the electrical equipment technical standards.

이때 모든 공장이나 빌딩 내에 설치된 전동기와 같은 전기기기의 외함에 설치된 접지는 단독접지로 시공되어 있으므로 접지저항을 측정하려고 하는 경우에는 3 전극법에 의한 전위차계식 접지저항계를 사용하는 방법(또는 전위강하법)을 이용하고 있다. 도 1은 종래의 단독접지저항 측정방법인 전위강하법을 설명하는 도면이고, 도 2는 종래의 전위강하법으로 단독접지저항을 측정하는 상태를 설명하는 도면 이다. 도 1에서 전극(E)은 측정의 대상이 되는 접지전극이고, 전극(C)과 전극(P)은 측정용의 보조전극으로서 전극(E)로부터 적당한 거리에 박는다. 전극(C)은 전류보조전극이고 전극(P)은 전위보조전극이다. In this case, the ground installed in the enclosure of electrical equipment such as electric motors installed in all factories or buildings is constructed as a single ground. Therefore, if you want to measure the ground resistance, use a potentiometer-type ground resistance meter by the three-electrode method (or the potential drop method). Is using. 1 is a view for explaining a potential drop method, which is a conventional single ground resistance measurement method, and FIG. 2 is a view for explaining a state for measuring a single earth resistance with a conventional potential drop method. In Fig. 1, the electrode E is a ground electrode to be measured, and the electrodes C and P are driven at an appropriate distance from the electrode E as auxiliary electrodes for measurement. The electrode C is a current auxiliary electrode and the electrode P is a potential auxiliary electrode.

도 1에 도시된 바와 같이, 접지전극(E)와 보조전극(C) 사이에 전원을 구비하고 전류 I[A]를 접지전극(E)에 인가한 후 보조전극(P)을 접지전극(E)로부터 보조전극(C) 방향으로 점진적으로 진행시키면서 접지전극(E)와 보조전극(P) 사이의 대지전위를 측정한다. 측정 시에 전극(E)와 전극(C) 간에 전원을 이어서 대지에 전류를 흘리는데 이 전류에는 교류를 쓴다. 그 이유는 직류를 쓰면 전기화학작용이 생기기 때문이다. 또한 교류의 주파수로는 전력계통으로부터의 유도신호를 분리하기 쉽도록 상용 이외의 주파수를 쓰고 있으나, 교류의 주파수로서 너무 높은 것을 쓰면 리드선의 인덕턴스나 정전용량의 영향을 받게 되므로 1[kHz] 이하가 바람직하다. As shown in FIG. 1, a power source is provided between the ground electrode E and the auxiliary electrode C, and a current I [A] is applied to the ground electrode E, and then the auxiliary electrode P is connected to the ground electrode E. FIG. The ground potential between the ground electrode (E) and the auxiliary electrode (P) is measured while gradually progressing toward the auxiliary electrode (C). At the time of a measurement, a power is connected between the electrode E and the electrode C, and an electric current flows to earth, and an alternating current is used for this electric current. This is because direct current causes electrochemical action. In addition, the frequency of alternating current is used for non-commercial frequency so that it is easy to separate the induced signal from the power system. However, if the frequency of alternating current is too high, the inductance or capacitance of the lead wire may be affected. desirable.

아래 그래프에서 전위의 변화가 평행한 지점에서의 접지전극(E)와 보조전극(P) 사이의 전위 Ep[V]를 전류 I[A]로 나눈 값이 접지전극(E)의 접지저항이 된다.In the graph below, a value obtained by dividing the potential Ep [V] between the ground electrode E and the auxiliary electrode P by the current I [A] at the point where the change of potential is parallel is the ground resistance of the ground electrode E. .

그러나 이러한 3 전극법에 의한 접지저항 측정에서는 다음과 같은 여러 문제점이 있다. 첫째로, 접지저항 측정 시에는 전위전극과 전류전극으로서 길이가 50Cm이고, 직경이 1Cm인 보조전극을 15 Cm 이상 땅에 타입(打入)하여야 하는데, 콘크리트나 아스팔트로 포장되어 있는 장소에서는 박기가 매우 어렵다. 둘째로, 보조전극의 타입은 측정 대상인 접지전극(또는 피측정 접지전극)으로부터 전위보조전극은 5m 이상, 전류보조전극은 10m 이상 거리를 유지하여야 하는데 건물 내에서 이와 같 은 직선거리는 확보하기가 어렵다. 셋째로, 접지저항 측정 시에는 측정 대상인 접지전극과 보호기기를 분리하고, 접지저항 측정 후에 다시 연결하여야 하는데 이를 위해 많은 시간이 소요되고 안전사고의 위험이 있다. 넷째로, 측정 대상인 접지전극의 주위에 수도관과 같은 도전성 매설물이 설치되어 있는 경우에는 보조전극의 타입 위치에 따라 접지저항의 측정 오차가 심하게 발생한다. 다섯째로, 측정 대상인 접지전극과 접지저항측정계의 전위 전극을 연결하는 경우에 그 사이에 전위차가 발생하여 접지저항을 측정하지 못하는 경우가 많다.However, the ground resistance measurement by the three-electrode method has a number of problems as follows. First, when measuring ground resistance, auxiliary electrodes with a length of 50 cm as a potential electrode and a current electrode and a diameter of 1 cm should be typed on a ground of 15 cm or more. Very difficult. Second, the auxiliary electrode should be kept at least 5m from the potential auxiliary electrode and at least 10m from the current auxiliary electrode from the ground electrode (or the measured ground electrode) to be measured. . Third, when measuring ground resistance, the grounding electrode and the protective device to be measured must be disconnected and reconnected after the ground resistance measurement. Fourth, in the case where a conductive embedding material such as a water pipe is provided around the ground electrode to be measured, the measurement error of the ground resistance is severely generated depending on the type position of the auxiliary electrode. Fifth, when the ground electrode to be measured and the potential electrode of the ground resistance measuring system are connected to each other, a potential difference occurs between the ground resistances.

따라서 본 발명은 이러한 종래 기술의 문제점을 해결하는 것을 목적으로 하여, 보조전극을 타입 할 필요 없이 용이하게 단독접지저항을 측정하는 방법을 제공하는 것을 일 목적으로 한다.Accordingly, an object of the present invention is to provide a method for easily measuring a single earth resistance without having to type an auxiliary electrode for the purpose of solving the problems of the prior art.

또한, 본 발명은 접지전극과 보호기기를 분리하지 않고, 활선 상태인 접지전극의 접지저항을 측정하는 방법을 제공하는 것을 다른 목적으로 한다.Another object of the present invention is to provide a method for measuring the ground resistance of the ground electrode in a live state without separating the ground electrode and the protective device.

본 발명의 목적들은 앞에서 언급한 목적으로 제한되지 않는다. 본 발명의 다른 목적 및 장점들은 아래 설명에 의해 더욱 분명하게 이해될 것이다. The objects of the present invention are not limited to the above-mentioned objects. Other objects and advantages of the invention will be more clearly understood by the following description.

이러한 목적을 달성하기 위한 본 발명은 단독접지의 접지저항을 측정하는 방법에 있어서, 측정 대상인 단독접지를 저압선로의 접지선과 연결하여 다중접지화 하는 단계와, 다중접지 계통에서만 접지저항을 측정하는 후크식 접지저항계를 이용하여 상기 다중접지화 된 단독접지의 접지저항을 측정하는 단계를 포함하는 것을 일 특징으로 한다. In order to achieve the above object, the present invention provides a method of measuring grounding resistance of a single ground, comprising: connecting a single ground to be measured with a ground line of a low voltage line and multi-grounding the hook, and measuring a grounding resistance only in a multi-grounding system. It characterized in that it comprises the step of measuring the grounding resistance of the multi-grounded single ground using an expression grounding resistance meter.

또한, 본 발명은 단독접지의 접지저항을 측정하는 방법에 있어서, 저압선로에 설치된 누전차단기의 전원 측의 접지선에 제1 단독접지를 연결하여 상기 제1 단독접지를 다중접지화 하는 단계와, 다중접지 계통에서만 접지저항을 측정하는 후크식 접지저항계를 이용하여 상기 다중접지화 된 제1 단독접지의 접지저항을 측정하는 단계와, 상기 제1 단독접지와 제2 단독접지를 전기적으로 연결하는 단계와, 상기 전기적으로 연결된 제1 단독접지와 제2 단독접지의 직렬합성 저항을 상기 후크식 접지저항계를 이용하여 측정하고 상기 제2 단독접지의 접지저항을 계산하는 단계를 포함하는 것을 다른 특징으로 한다. In addition, the present invention provides a method for measuring the ground resistance of a single ground, comprising the steps of connecting the first single ground to the ground line on the power supply side of the earth leakage breaker installed in the low-voltage line to multiple ground the first single ground; Measuring a ground resistance of the multi-grounded first single ground by using a hook type ground resistance meter measuring ground resistance only in a ground system, and electrically connecting the first single ground and the second single ground; And measuring the series synthesis resistance of the electrically connected first single ground and the second single ground using the hook-type ground resistance meter and calculating the ground resistance of the second single ground.

본 발명에 의하면, 보조전극을 타입 할 필요 없이 용이하게 단독접지저항을 측정할 수 있으며, 또한 접지전극과 보호기기를 분리하지 않고 활선상태에서 단독접지전극의 접지저항을 측정할 수 있다. According to the present invention, the single grounding resistance can be easily measured without having to type the auxiliary electrode, and the grounding resistance of the single grounding electrode can be measured in a live state without separating the grounding electrode and the protective device.

상술한 목적, 특징 및 장점은 첨부된 도면을 참조하여 상세하게 후술되어 있는 상세한 설명을 통하여 보다 명확해 질 것이며, 그에 따라 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 용이하게 실시할 수 있을 것이다. 또한, 본 발명을 설명함에 있어서 본 발명과 관련된 공지 기술에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에 그 상세한 설명을 생략하기로 한다. 이하, 첨부된 도면을 참조하여 본 발명에 따른 바람직한 실시 예를 상세히 설명하기로 한다.The above objects, features, and advantages will become more apparent from the detailed description given hereinafter with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains may share the technical idea of the present invention. It will be easy to implement. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명의 일 실시 예에 의한 단독접지저항 측정방법을 설명하는 흐름도이다. 3 is a flowchart illustrating a method of measuring a single ground resistance according to an embodiment of the present invention.

먼저, 측정 대상인 단독접지를 저압선로의 접지선과 연결하여 다중접지로 만든다(S302). 공장이나 빌딩에 설치되어 있는 저압선로의 접지선은 배전선로의 중성선에 연결되어 있다. 저압선로의 접지선으로서 220V 콘센트의 접지된 선로를 이용한다. 다음에는 후크식 접지저항계를 이용하여 측정 대상의 접지저항을 측정한다(S304). 후크식 접지저항계는 다중접지 계통에서만 접지저항을 측정한다.First, a single ground to be measured is connected to the ground line of the low voltage line to make a multiple ground (S302). The ground wire of the low voltage line installed in the factory or building is connected to the neutral line of the distribution line. The ground wire of the 220V outlet is used as the ground wire of the low voltage line. Next, the ground resistance of the measurement target is measured using a hook-type ground resistance meter (S304). Hook-type earth resistance meter measures earth resistance only in multi-ground system.

도 4는 배전선로에서 3상 4선식 Y 결선을 설명하는 도면이고, 도 5는 도 4에 도시된 변압기의 내부 결선을 설명하는 도면이다. 도 4와 도 5에서 "N"로 표시된 선이 접지선으로 배전선로의 중성선과 연결되어 있다. 4 is a diagram illustrating a three-phase four-wire Y connection in a distribution line, and FIG. 5 is a diagram illustrating an internal connection of the transformer shown in FIG. 4. In FIG. 4 and FIG. 5, the line marked "N" is connected to the neutral line of the distribution line by the ground line.

도 6은 본 발명에 따라 다중접지 계통에서만 사용되는 후크식 접지저항계(602)로 단독접지저항을 측정하는 방법을 설명하는 도면이다. 도 6에서 Rx는 모터와 같은 전기기기(604)에 연결되는 측정 대상인 단독접지전극이며, 606는 공장 등의 벽에 설치된 220V 콘센트이고, 608은 배전선로의 중성선이다. 6 is a view for explaining a method of measuring a single grounding resistance with a hook-type grounding resistance meter 602 used only in a multi-grounding system according to the present invention. In FIG. 6, Rx is a single ground electrode that is a measurement target connected to an electric device 604 such as a motor, 606 is a 220V outlet installed on a wall of a factory, etc., and 608 is a neutral wire of a distribution line.

한전의 가공 배전선로는 도 6에서와 같이, 주상 변압기가 설치된 전주는 모든 전주가 접지되며 주상 변압기가 설치되지 않은 전주는 5 경간 마다 접지되어 중성선(608)과 연결되는 다중접지 계통으로 구성되어 있다. 그리고 이 중성선(608)은 국내의 모든 변전소의 메쉬(mesh) 접지와 병렬로 연결되어 있으므로 합성 접지저항은 0.1[Ω] 이하로 매우 낮다. As shown in FIG. 6, the poles in which the pole pole transformer is installed are grounded, and the poles in which the pole pole transformer is not installed are constituted by a multi-ground system connected to the neutral wire 608 by being grounded every five spans. . And since the neutral wire 608 is connected in parallel with the mesh (ground) of all domestic substations, the synthetic ground resistance is very low, 0.1 [Ω] or less.

측정 대상인 단독접지전극은 220V 콘센트(606)에 연결된 접지선이 중성선(608)에 연결되어 있으므로 다중접지로 된다. 이 상태에서 후크식 접지저항계(602)와 같은 다중접지 저항계로 접지저항(Rx)을 측정한다. Since the grounding wire connected to the 220V outlet 606 is connected to the neutral wire 608, the single grounding electrode to be measured is multi-grounded. In this state, the ground resistance Rx is measured by a multi-ground ohmmeter such as the hook-type ground ohmmeter 602.

도 7은 도 6의 등가회로이고, 도 8은 도 7의 등가회로이다. 도 8에서 측정 대상인 접지저항(Rx)을 제외한 다른 접지극의 합성 저항(Rs)은 수학식 1과 같이 표시된다.7 is an equivalent circuit of FIG. 6, and FIG. 8 is an equivalent circuit of FIG. 7. In FIG. 8, the combined resistance Rs of the other ground electrode except the ground resistance Rx as the measurement target is represented by Equation 1 below.

Figure 112009001699299-pat00001
Figure 112009001699299-pat00001

따라서 Rx의 접지선에 후크식 접지저항계(602)의 전압주입용 변류기(current transformer)(CT1)로 전압 V를 인가하면 전류 I가 흐르게 되며, 전류검출용 변류기(CT2)로 전류 I를 검출하면 수학식 2가 성립한다.Therefore, when the voltage V is applied to the ground wire of Rx by the current transformer CT1 of the hook-type ground resistance meter 602, the current I flows, and when the current I is detected by the current detection current transformer CT2, Equation 2 holds.

Figure 112009001699299-pat00002
Figure 112009001699299-pat00002

그런데 중성선 다중접지 계통에서는 접지전극의 수(n)가 대단히 많기 때문에 수학식 3과 같이 표시할 수 있다.However, in the neutral multi-ground system, since the number (n) of ground electrodes is very large, it can be expressed as in Equation (3).

Figure 112009001699299-pat00003
Figure 112009001699299-pat00003

수학식 3를 이용하여 수학식 2를 간단하게 정리하면 수학식 4와 같다.Using Equation 3, Equation 2 can be summarized as Equation 4.

Figure 112009001699299-pat00004
Figure 112009001699299-pat00004

즉, 전압 V를 일정하게 하면 전류 I와 저항 Rx가 역비례 관계에 있으므로 전류 I를 측정하면 접지저항 Rx를 측정할 수 있다. In other words, if the voltage V is made constant, the current I and the resistance Rx are inversely related, so when the current I is measured, the ground resistance Rx can be measured.

콘센트를 이용하는 경우에 누전차단기가 동작할 우려가 있으므로, 접지저항 측정 시에 외부의 전선을 이용하여 누전차단기 1차 측(전원 측)에 설치된 집지선과 측정 대상인 단독접지전극을 연결하는 것이 바람직하다. 도 9는 이를 설명하는 도면이다. 도 9에서 902는 누전차단기를 나타내고 전선(2)는 접지선을 나타낸다. 전선(2)에서 "B"점은 저압선로로부터 누전차단기(902)의 1차 측(전원 측)에 위치한 지점이며, "C"점은 누전차단기(902)의 2차 측(부하 측)에 위치한 지점이다. 저압선로는 누전차단기(902)를 경유하여 전기기기(604)에 전원을 공급한다. 활선 상태에 서 접지전극저항(Rx)을 측정하기 위하여 "A"점과 "C"점을 연결하면 전선(1)과 전선(2)에 흐르는 전류가 차이가 발생하여 누전차단기(902)가 동작할 수 있다. 이를 방지하기 위해 도 9에 도시된 바와 같이 "A"점과 "B"점을 전선으로 연결하고 후크식 접지저항계(602)를 이용하여 접지전극저항(Rx)을 측정한다.Since an earth leakage breaker may operate when an outlet is used, it is preferable to connect a ground wire installed on the primary side (power supply side) of the earth leakage breaker and the single earthing electrode to be measured by using an external wire when measuring ground resistance. . 9 is a diagram illustrating this. In FIG. 9, 902 denotes an earth leakage breaker and the wire 2 denotes a ground wire. The point "B" in the electric wire 2 is a point located on the primary side (power side) of the earth leakage breaker 902 from the low voltage line, and the point "C" is on the secondary side (load side) of the earth leakage breaker 902. It is a branch located. The low voltage line supplies power to the electric device 604 via the earth leakage breaker 902. When the "A" point and the "C" point are connected to measure the ground electrode resistance (Rx) in the live state, the current flowing through the wire (1) and the wire (2) is generated, the earth leakage breaker 902 operates can do. In order to prevent this, as shown in FIG. 9, the "A" point and the "B" point are connected by wires, and the ground electrode resistance Rx is measured using the hook-type grounding resistance meter 602.

한편, 누전차단기 1차 측(전원 측)에 설치된 중성선과 측정 대상인 단독접지전극 사이의 거리가 장거리이어서 전선으로 연결하기 불편한 경우에는 누전차단기의 1차 측(전원 측)에 설치된 중성선과 제일 근접한 단독접지전극의 접지저항을 먼저 측정하고, 여기에서 측정한 단독접지전극의 접지저항을 이용하여 단계적으로 다른 단독접지전극의 접지저항을 측정한다. 즉, 누전차단기의 1차 측에 설치된 중성선과 중성선으로부터 제일 근접한 제1 단독접지전극을 연결하여 제1 단독접지전극의 접지저항을 먼저 측정한다. 다음에는 중성선을 이용하지 않고 제1 단독접지전극과 다른 단독접지전극인 제2 단독접지전극만을 서로 연결하여 직렬합성 저항을 측정한 후에, 측정된 저항 값에서 제1 단독접지전극의 접지저항을 빼줌으로써 제2 단독접지전극의 접지저항을 계산한다. 이와 같은 단계를 반복하여 공장과 빌딩 내에 설치된 측정 대상인 단독접지전극의 접지저항을 측정할 수 있다. On the other hand, if the distance between the neutral wire installed on the primary side (power supply side) of the earth leakage breaker and the single earthing electrode to be measured is long, and it is inconvenient to connect the wire, the single wire closest to the neutral wire installed on the primary side (power supply side) of the earth leakage breaker The ground resistance of the ground electrode is measured first, and then the ground resistance of another single ground electrode is measured step by step using the ground resistance of the single ground electrode. That is, the ground resistance of the first single grounding electrode is first measured by connecting a neutral line installed on the primary side of the ground fault circuit breaker and the first single grounding electrode closest to the neutral line. Next, the series synthesis resistance is measured by connecting only the first single ground electrode and the second single ground electrode, which is another single ground electrode, without using a neutral wire, and then subtract the ground resistance of the first single ground electrode from the measured resistance value. To calculate the ground resistance of the second single ground electrode. By repeating these steps, it is possible to measure the ground resistance of the single ground electrode, which is the measurement target installed in the factory and building.

이상에서 설명한 본 발명은, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 있어 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 여러 가지 치환, 변형 및 변경이 가능하므로 전술한 실시 예 및 첨부된 도면에 의해 한정되는 것이 아니다.The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

도 1은 종래의 단독접지저항 측정방법인 전위강하법을 설명하는 도면이고,1 is a diagram illustrating a potential drop method, which is a conventional single ground resistance measurement method.

도 2는 종래의 전위강하법으로 단독접지저항을 측정하는 상태를 설명하는 도면이며,2 is a view for explaining a state of measuring the single earth resistance by the conventional potential drop method.

도 3은 본 발명의 일 실시 예에 의한 단독접지저항 측정방법을 설명하는 흐름도이며,3 is a flowchart illustrating a method of measuring a single earth resistance according to an embodiment of the present invention.

도 4는 배전선로에서 3상 4선식 Y 결선을 설명하는 도면이고,4 is a diagram illustrating a three-phase four-wire Y connection in a distribution line,

도 5는 도 4에 도시된 변압기의 내부 결선을 설명하는 도면이며,5 is a view for explaining the internal wiring of the transformer shown in FIG.

도 6은 본 발명에 따라 후크식 접지저항계로 단독접지저항을 측정하는 방법을 설명하는 도면이고,6 is a view for explaining a method of measuring a single grounding resistance with a hook-type grounding resistance meter according to the present invention,

도 7은 도 6의 등가회로이며,7 is an equivalent circuit of FIG. 6,

도 8는 도 7의 등가회로이고,8 is an equivalent circuit of FIG. 7,

도 9는 본 발명의 다른 실시 예에 따라 후크식 접지저항계로 단독접지저항을 측정하는 방법을 설명하는 도면이다. 9 is a view for explaining a method of measuring a single grounding resistance with a hook-type grounding resistance meter according to another embodiment of the present invention.

Claims (4)

단독접지의 접지저항을 측정하는 방법에 있어서,In the method of measuring the ground resistance of a single ground, 측정 대상인 단독접지가 저압선로의 접지선과 연결되어 다중접지로 되는 단계와,A single ground to be measured is connected to the ground line of the low voltage line and becomes a multiple ground; 다중접지 계통에서만 접지저항을 측정하는 후크식 접지저항계로써 상기 다중접지로 된 단독접지의 접지저항이 측정되는 단계를Step of measuring the ground resistance of the single ground of the multi-ground with a hook-type ground resistance meter that measures the ground resistance only in the multi-ground system 포함하는 것을 특징으로 하는 단독접지의 접지저항 측정방법.Grounding resistance measurement method of a single earth, characterized in that it comprises a. 제 1 항에 있어서,The method of claim 1, 상기 저압선로의 접지선으로 220V 콘센트의 접지된 선로를 이용하는 것을 특징으로 하는 단독접지의 접지저항 측정방법.The grounding resistance measurement method of the single ground, characterized in that using the grounded line of the 220V outlet as the ground wire of the low voltage line. 제 1 항에 있어서,The method of claim 1, 상기 저압선로의 접지선은 상기 저압선로에 설치된 누전차단기의 전원 측에 설치된 접지선인 것을 특징으로 하는 단독접지의 접지저항 측정방법.The grounding wire of the low voltage line is a grounding resistance measuring method of a single ground, characterized in that the grounding line is provided on the power supply side of the earth leakage breaker installed in the low voltage line. 단독접지의 접지저항을 측정하는 방법에 있어서,In the method of measuring the ground resistance of a single ground, 저압선로에 설치된 누전차단기의 전원 측의 접지선에 제1 단독접지가 연결되어 상기 제1 단독접지가 다중접지로 되는 단계와,A first single ground is connected to the ground line on the power supply side of the earth leakage breaker installed in the low-voltage line so that the first single ground is a multi-ground; 다중접지 계통에서만 접지저항을 측정하는 후크식 접지저항계가 이용되어 상기 다중접지화 된 제1 단독접지의 접지저항이 측정되는 단계와,A grounding resistance of the multi-grounded first single ground is measured by using a hook-type grounding resistance meter measuring grounding resistance only in a multi-grounding system; 상기 제1 단독접지와 제2 단독접지가 전기적으로 연결되는 단계와,Electrically connecting the first single ground and the second single ground; 상기 전기적으로 연결된 제1 단독접지와 제2 단독접지의 직렬합성저항이 상기 후크식 접지저항계로써 측정되고 상기 제2 단독접지의 접지저항이 계산되는 단계를The series synthesis resistance of the electrically connected first single ground and the second single ground is measured by the hook-type ground resistance meter and the ground resistance of the second single ground is calculated. 포함하는 것을 특징으로 하는 단독접지의 접지저항 측정방법.Grounding resistance measurement method of a single earth, characterized in that it comprises a.
KR1020090002278A 2009-01-12 2009-01-12 Method for measuring earth resistance of a single ground in active state KR100918515B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090002278A KR100918515B1 (en) 2009-01-12 2009-01-12 Method for measuring earth resistance of a single ground in active state

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090002278A KR100918515B1 (en) 2009-01-12 2009-01-12 Method for measuring earth resistance of a single ground in active state

Publications (1)

Publication Number Publication Date
KR100918515B1 true KR100918515B1 (en) 2009-09-24

Family

ID=41356007

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090002278A KR100918515B1 (en) 2009-01-12 2009-01-12 Method for measuring earth resistance of a single ground in active state

Country Status (1)

Country Link
KR (1) KR100918515B1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101447676B1 (en) 2012-09-13 2014-10-06 한국전력공사 Method and apparatus for measuring isolated ground resistance of power facility of existing powerline
KR101520254B1 (en) * 2013-10-14 2015-05-15 한국전기연구원 Design Method for Reduction of 1-ph Fault Current Satisfying Effective Grounding Criterion Without Neutral Impedance Device in Transformer Substation
KR20230104359A (en) 2021-12-30 2023-07-10 한국전력공사 Method of calculating single ground resistance of multi-ground system
CN116879635A (en) * 2023-07-27 2023-10-13 中国南方电网有限责任公司超高压输电公司广州局 Common ground electrode resistance monitoring method, device, equipment, storage medium and product
KR102593291B1 (en) 2023-04-04 2023-10-24 에스엠인스트루먼트 주식회사 A ground resistance measurement system on energized line using ground potential of grounding electrode and the method thereof
WO2023245913A1 (en) * 2022-06-21 2023-12-28 南方电网科学研究院有限责任公司 Method, apparatus and system for monitoring earthing resistance of earthing pole, and medium
KR20240000756U (en) 2022-10-28 2024-05-08 주식회사 한국가스기술공사 Ground Continuity Measurement Circuit
KR20240000757U (en) 2022-10-28 2024-05-08 주식회사 한국가스기술공사 Grounding Performance Multi-Measuring Device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5682458A (en) 1979-12-10 1981-07-06 Hitachi Ltd Insulation resistance measuring apparatus of neutral point ground system
KR900000984B1 (en) * 1986-09-11 1990-02-23 조승기 Earth resistance measure method and system
KR20020089864A (en) * 2001-05-25 2002-11-30 한국전력공사 Ground resist ance tester for power electric poles and a method of the measuring
KR20050048407A (en) * 2003-11-19 2005-05-24 (주)무한이노베이션 Apparatus for measuring earth resistance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5682458A (en) 1979-12-10 1981-07-06 Hitachi Ltd Insulation resistance measuring apparatus of neutral point ground system
KR900000984B1 (en) * 1986-09-11 1990-02-23 조승기 Earth resistance measure method and system
KR20020089864A (en) * 2001-05-25 2002-11-30 한국전력공사 Ground resist ance tester for power electric poles and a method of the measuring
KR20050048407A (en) * 2003-11-19 2005-05-24 (주)무한이노베이션 Apparatus for measuring earth resistance

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101447676B1 (en) 2012-09-13 2014-10-06 한국전력공사 Method and apparatus for measuring isolated ground resistance of power facility of existing powerline
KR101520254B1 (en) * 2013-10-14 2015-05-15 한국전기연구원 Design Method for Reduction of 1-ph Fault Current Satisfying Effective Grounding Criterion Without Neutral Impedance Device in Transformer Substation
KR20230104359A (en) 2021-12-30 2023-07-10 한국전력공사 Method of calculating single ground resistance of multi-ground system
WO2023245913A1 (en) * 2022-06-21 2023-12-28 南方电网科学研究院有限责任公司 Method, apparatus and system for monitoring earthing resistance of earthing pole, and medium
KR20240000756U (en) 2022-10-28 2024-05-08 주식회사 한국가스기술공사 Ground Continuity Measurement Circuit
KR20240000757U (en) 2022-10-28 2024-05-08 주식회사 한국가스기술공사 Grounding Performance Multi-Measuring Device
KR102593291B1 (en) 2023-04-04 2023-10-24 에스엠인스트루먼트 주식회사 A ground resistance measurement system on energized line using ground potential of grounding electrode and the method thereof
CN116879635A (en) * 2023-07-27 2023-10-13 中国南方电网有限责任公司超高压输电公司广州局 Common ground electrode resistance monitoring method, device, equipment, storage medium and product
CN116879635B (en) * 2023-07-27 2024-06-04 中国南方电网有限责任公司超高压输电公司广州局 Common ground electrode resistance monitoring method, device, equipment, storage medium and product

Similar Documents

Publication Publication Date Title
KR100918515B1 (en) Method for measuring earth resistance of a single ground in active state
CN103698653A (en) System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement
JP2009207286A (en) Ground wire branch terminal and distribution panel
CA3020677C (en) Ground impedance measurement of a conduit system
CN108152662A (en) A kind of cross interconnected box fault diagnosis method and system based on earth current
CN103323751A (en) High-voltage short-cable insulation terminal partial discharge testing device and using method
KR101056535B1 (en) Ground Simulation Circuit and Device of Low Voltage Wiring System
CN103487725A (en) Overhead distributing line ground fault indicating device based on zero-sequence component method
KR100918516B1 (en) Method for measuring earth resistance of a ground in a manhole
EP3185025B1 (en) Electrical fault location method
CN102969695A (en) Grounding forecasting method in neutral-point low-resistance grounding mode
JP5681889B2 (en) Grounding system connection status confirmation system
EP1599738A1 (en) Detection of earth faults in three phase systems
JP5505876B2 (en) Grounding system connection status confirmation device
CN203587736U (en) Overhead distributing line ground fault indicating device based on zero-sequence component method
RU2484570C2 (en) Method for determination of damaged feeder on bus section of three-phase grid with insulated neutral in case of single phase earth faults
RU2640315C1 (en) Adjustable capacitive sensor of high voltage
JP5419030B2 (en) Grounding system connection status confirmation method
KR101358025B1 (en) Electrical continuity assessment device
KR101873005B1 (en) 3 Phase 4 Wires Zero Current Transformer for Detecting Insulation Resistance
Zhang et al. Experimental and numerical study of division factors of fault current and measuring current due to ground wires of transmission lines
CN101699304A (en) Direct current grounding trouble shooting method for substation
CN107831368A (en) A kind of distribution transformer earthing impedance measurement device and method
JP7456868B2 (en) Connection body deterioration diagnosis device and connection body deterioration diagnosis method
RU2321009C1 (en) Method and device for measurement of earth rod resistance

Legal Events

Date Code Title Description
A201 Request for examination
N231 Notification of change of applicant
A302 Request for accelerated examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130911

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20140710

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20150625

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20160705

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20170825

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20180913

Year of fee payment: 10

FPAY Annual fee payment

Payment date: 20191015

Year of fee payment: 11