KR20150024017A - Apparatus for detecting disconnection position of power distribution line using phase current deviation and the method thereof - Google Patents

Abstract

The present invention relates to a device and a method for detecting the disconnection position of a power distribution line using a phase current deviation. The device of the present invention comprises: a switch data management unit to store at least one information of the phase current deviation level information of each switch, whether terminal sections of each switch is connected, phase current data of each switch, and phase current measurement order of switch for power distribution line; a disconnection failure detection unit to detect the disconnection failure of each power distribution line using the phase current deviation level information after calculating the phase current deviation level of each switch by measuring or acquiring phase current data of each switch; and a disconnection position determination unit to determine a disconnection position using the information stored in the switch data management unit when the disconnection failure of the power distribution line is determined by the disconnection failure detection unit.

Description

[0001] APPARATUS FOR DETECTING DISCONNECTION POSITION OF POWER DISTRIBUTION LINE USING PHASE CURRENT DEVIATION AND THE METHOD THEREOF [0002]

The present invention relates to an apparatus and method for detecting disconnection of a distribution line using a phase current deviation, and more particularly, to an apparatus and method for detecting disconnection position of a distribution line by using phase current deviation information measured by a distribution automation switch And more particularly, to an apparatus and method for detecting disconnection of a distribution line using phase current deviation.

Generally, in Korea distribution cable, most of the insulated wires are used. In case where the covering part of the wire comes into contact with the ground or the conductor part of the wire comes into contact with a material having high resistance, even if a ground fault occurs, Therefore, protective devices (eg circuit breakers, reclosers, fuses, etc.) may not operate due to failure to detect disconnection and ground fault.

If the detection of the disconnection and ground fault position is delayed as described above, there is a high possibility that a person in the vicinity of the electric wire that has fallen to the ground surface after the disconnection is exposed to an electric shock accident. In addition, there is a problem that the sound section is affected by the power supply due to the broken wire section. Therefore, it is necessary to detect the broken-line fault position as quickly as possible and to separate the faulty section.

In accordance with the above-mentioned necessity, many methods for detecting the disconnection position have been conventionally developed. For example, in the case of three-phase disconnection, the disconnection position is detected using the voltage information measured by the automatic switchgear for each section, and the reliability of the voltage measurement result is low, so that the disconnection position can not be detected.

Hereinafter, the conventional disconnection position detection method will be described in more detail.

FIG. 1 is an exemplary view for explaining a distribution automation system for informing single-wire image formation information using a voltage measured by a conventional distribution automation switch.

As shown in FIG. 1, the distribution power automation switches 13, 14, 15, 16 are provided in the distribution line trunk line 12 and the respective communication channels 21, 22, 23, and 24, and to transmit control commands from the power distribution master 20, if necessary.

Assuming that a single-wire failure occurs on the B-phase in the distribution line between the first distribution automation switch 13 and the second distribution automation switch 14 of the trunk line 12, When the voltage information is received from the switches (13, 14, 15, 16) and the voltage level between the upper and the ground is lower than the predetermined level set at the steady state, the distribution automation disconnection is related to the screen (not shown) By displaying the phases (30, 31) for each distribution automation switch, the user (or manager) can easily determine the disconnection section (that is, disconnection position).

However, there is a problem that the reliability of the voltage measurement result of the power distribution automation switch is low and it is difficult to utilize.

That is, the measurement of the voltage inside the distribution automation switch is performed through the Capacitance Potential Transformer (CPT), which causes a measurement error due to various causes.

FIG. 2 is a graph illustrating a measurement result performed in order to determine the reliability of voltage measurement of the power distribution automation switch in FIG. 1; FIG.

In Fig. 2, the X-axis represents the measurement position and the Y-axis represents the voltage value.

As shown in FIG. 2, it can be seen that the value 42 estimated by the actual voltage value and the voltage value 41 measured through the distribution automation switch have a very large deviation and an irregular tendency, And the reliability of the result is very poor.

As another conventional technique, there is a method of detecting a physical change during disconnection.

However, this method exists only as an idea, or has been used in other countries before the 1980s, but has no practical experience in Korea. For example, in the past, in some countries (such as the United States), the idea of changing the line slope to mechanical (for example, changing the tension of a wire) ), And there is a device that induces a complete ground fault by connecting the neutral conductor and the phase conductor.

However, since the above method commonly detects physical changes, the number of electric or mechanical sensors to be installed per line is inevitably increased because the affected section is long when the electric wire is broken. Accordingly, the above-described method has a problem that the reliability is deteriorated due to an increase in installation cost and a failure rate of a plurality of installed sensors themselves. In addition, the method of installing a plurality of devices requires maintenance work of the device itself, and therefore, it is difficult to use it as an appropriate detection method in a general situation rather than a special situation.

As another conventional technique, there is a method of analyzing a ground fault current after disconnection. For example, in the case of the Y-connection type multi-ground radial distribution system, in order to detect a high-resistance ground fault with a small ground fault current in a low-operation North American system, where a distribution automation system is operated in consideration of a distribution line distance, The method of analyzing the current at the drawing point is used.

This method has a high economic efficiency when considering operating and communication costs in a long-distance power distribution line, and is a detection method mainly for arcing. In the case of North America, It is a reasonable way.

However, as shown in FIG. 3, there is a problem that it is difficult to detect the breakage of the wire if there is no fault current due to the break of the jumper wire. Especially in Korea, there is a high probability that the fault current does not occur because the insulation wire ratio is very high. Also, even if detection is possible by using other supplementary information, there is a problem that it is difficult to grasp the position of the breakage failure.

The background art of the present invention is disclosed in Korean Registered Patent No. 10-1100969 (registered on December 23, 2011, and a method for detecting a broken wire on a distribution line).

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a distribution line using a phase current deviation that can accurately and quickly detect a disconnection position of a distribution line using information on the deviation of phase current measured by a distribution automation switch And an object thereof is to provide a disconnection position detecting apparatus and method.

The disconnection position detection device for a distribution line using a phase current deviation according to an aspect of the present invention is characterized in that the disconnection position detection device for a distribution line is provided with a step of measuring the phase current of the switch according to the distribution line, An open / close data management unit for storing at least one or more pieces of information; A single-wire fault detecting unit for measuring or obtaining the phase current data for each switch, calculating a phase current deviation level for each switch, and detecting whether the single-wire fault is broken for each distribution line using the phase current deviation level information; And a disconnection position determining unit for determining disconnection position using the information stored in the switch data management unit when it is determined that there is a disconnection fault in the distribution line through the disconnection failure detecting unit, .

The present invention is further characterized by a communication unit for communicating with each of the switches in order to measure or obtain the phase current.

The present invention further includes a user interface unit for displaying a phase current, a phase current deviation level, and a failure point for each switch on a single wire when the disconnection position is estimated, and outputting an alarm to the user.

)과 3상 전류 크기(RMS) 중 최소값(

)의 차이(

)를 다시 상기 3상 전류 크기(RMS)의 평균(

)으로 나눈 값에 100을 곱하여 산출하는 것을 특징으로 한다.In the present invention, the phase current deviation level for each of the switches may be an average of three-phase current magnitudes (RMS)

) And the minimum value of the three-phase current magnitude (RMS)

) Difference

(RMS) of the three-phase current magnitude (RMS)

) Is multiplied by 100 to calculate the value.

In the present invention, the single-wire failure detecting section measures or obtains a phase current for each switch by forced polling in accordance with a predetermined phase current measurement procedure of a preset switch.

In the present invention, the single-wire failure detecting unit determines that there is a single-wire failure in the power distribution line when the phase current deviation level calculated for each switch is increasing in accordance with the measuring sequence of each switch.

)과 측정순서가 빠른 상전류 편차수준(

)과의 차이가 미리 설정된 오차 수준(

)을 벗어날 경우(

), 상전류 편차수준이 증가추세인 것으로 판단하며, 상기 오차 수준(

)은 전류 계측 시 오차와 배전선로 구간별 불평형을 고려하여 미리 설정되는 것을 특징으로 한다.In the present invention, it is preferable that the single-wire failure detecting unit is configured to detect the phase current deviation level

) And the fast phase current deviation level (

) Is smaller than a preset error level (

) Is out of range

), It is judged that the phase current deviation level is increasing trend, and the error level

) Is set in advance in consideration of the error in the current measurement and the unbalance of each section by the distribution line.

In the present invention, if the maximum value of the phase current deviation level of each breaker is not generated in the breaker connected to the terminal section power source side, the broken line position determining section determines that the broken line breakdown occurs in the power source section of the breaker in which the maximum value of the phase difference deviation level occurs .

)와 상전류값 중 최소값들의 차이(

)를 이용해 다시 그들 간의 차이값(

)을 구하여, 상기 차이값(

)이 '

'이내이면 차이가 없다고 간주하여, 상기 상전류 편차수준의 최대값이 발생된 개폐기의 부하구간에서 단선고장이 발생한 것으로 판단하며, 상기 차이값(

)이 '

'을 초과하면 차이가 있다고 간주하여, 상기 상전류 편차수준의 최대값이 발생된 개폐기의 전원구간에서 단선고장이 발생한 것으로 판단하는 것을 특징으로 한다.
In the present invention, if the maximum value of the phase current deviation level is generated in the switch connected directly to the terminal section power supply side, the disconnection position determining section may determine that the switch section connected directly to the terminal section power supply side and the phase current value Difference in maximum values (

) And the difference between the minimum values of the phase current values

) And the difference value between them

), And the difference value (

) This'

, It is determined that a single-wire failure occurs in a load section of the switch in which the maximum value of the phase current deviation level is generated, and the difference value

) This'

It is determined that there is a difference, and it is determined that a single-wire failure occurs in a power section of the switch in which the maximum value of the phase current deviation level is generated.

According to another aspect of the present invention, there is provided a method of detecting a disconnection position of a distribution line using a phase current deviation, the method comprising: measuring or obtaining phase current data for each switch; Calculating a phase current deviation level for each switch; Determining whether a single wire failure occurs in each of the power distribution lines using the phase current deviation level information; And determining a disconnection position using the phase current data and the phase current deviation level for each switch when it is determined that the disconnection failure occurs in the power distribution line, wherein the switch is an automatic switchgear for distribution.

The present invention further includes a step of storing at least one or more information of a phase current measurement order of the switch according to the distribution line, phase current data for each switch, whether or not the end section of each switch is connected, and phase current deviation level information for each switch, do.

According to the present invention, the step of determining the disconnection position is executed when a predetermined period or a specific time, or a predetermined specific event is generated.

The present invention further includes a step of displaying a phase current and a phase current deviation level and a fault point for each switch on the disconnection diagram and outputting an alarm to the user when the disconnection position is estimated.

)과 3상 전류 크기(RMS) 중 최소값(

)의 차이(

)를 다시 상기 3상 전류 크기(RMS)의 평균(

)으로 나눈 값에 100을 곱하여 산출하는 것을 특징으로 한다.In the present invention, the phase current deviation level for each of the switches may be an average of three-phase current magnitudes (RMS)

) And the minimum value of the three-phase current magnitude (RMS)

) Difference

(RMS) of the three-phase current magnitude (RMS)

) Is multiplied by 100 to calculate the value.

According to the present invention, the phase current data for each switch may be measured or obtained by forced polling according to a predetermined phase current measurement procedure of a predetermined switch.

In the present invention, the step of determining whether or not the single-wire fault has occurred is characterized in that it is determined that there is a single-wire fault in the power distribution line when the phase current deviation level calculated for each switch is increasing in accordance with the measuring sequence of each switch.

)과 측정순서가 빠른 상전류 편차수준(

)과의 차이가 미리 설정된 오차 수준(

)을 벗어날 경우(

), 상전류 편차수준이 증가추세인 것으로 판단하며, 상기 오차 수준(

)은 전류 계측 시 오차와 배전선로 구간별 불평형을 고려하여 미리 설정되는 것을 특징으로 한다.In the present invention, it is preferable that the step of judging whether or not the breakage of the breakage line has a phase current deviation level

) And the fast phase current deviation level (

) Is smaller than a preset error level (

) Is out of range

), It is judged that the phase current deviation level is increasing trend, and the error level

) Is set in advance in consideration of the error in the current measurement and the unbalance of each section by the distribution line.

In the present invention, it is preferable that the step of determining the disconnection position is performed such that, when the maximum value of the phase current deviation level for each switch is not generated in the switch connected to the terminal section power source side, It is determined that a failure has occurred.

)와 상전류값 중 최소값들의 차이(

)를 이용해 다시 그들 간의 차이값(

)을 구하여, 상기 차이값(

)이 '

'이내이면 차이가 없다고 간주하여, 상기 상전류 편차수준의 최대값이 발생된 개폐기의 부하구간에서 단선고장이 발생한 것으로 판단하며, 상기 차이값(

)이 '

'을 초과하면 차이가 있다고 간주하여, 상기 상전류 편차수준의 최대값이 발생된 개폐기의 전원측에서 단선고장이 발생한 것으로 판단하는 것을 특징으로 한다.
In the present invention, if the maximum value of the phase current deviation level is generated in the switch connected directly to the terminal section power supply side, the step of determining the disconnection position may include determining whether the switch section is directly connected to the terminal section power supply side, Difference in maximum values among phase current values

) And the difference between the minimum values of the phase current values

) And the difference value between them

), And the difference value (

) This'

, It is determined that a single-wire failure occurs in a load section of the switch in which the maximum value of the phase current deviation level is generated, and the difference value

) This'

, It is determined that there is a difference between the power supply side and the power supply side of the switchgear in which the maximum value of the phase current deviation level is generated.

The present invention has an effect of accurately and quickly detecting the disconnection position of the power distribution line using the deviation information of the phase current measured by the power distribution automation switch, and also can improve the detection rate of the disconnection fault through accurate information measurement do.

Brief Description of the Drawings Fig. 1 is an exemplary diagram for explaining a distribution automation system for informing solid-state image formation information using a voltage measured in a conventional power distribution automation switch.
FIG. 2 is a graph showing a measurement result performed in order to determine the reliability of voltage measurement of the power distribution automation switch in FIG. 1; FIG.
3 is an exemplary view showing the form of a jumper wire break in a processing distribution line;
4 is a diagram illustrating a schematic configuration of an apparatus for detecting a disconnection position of a distribution line using a phase current deviation according to an embodiment of the present invention.
FIG. 5 is an exemplary diagram for explaining a phase current deviation characteristic in a steady state for each measuring interval in a main trunk line by using the disconnection position detecting method according to the present invention. FIG.
6 is an exemplary diagram for explaining a phase current deviation characteristic in a steady state for each measuring section in a distribution line extending from a main trunk line to a branch line by using the disconnection position detecting method according to the present invention.
FIG. 7 is an exemplary diagram showing a maximum value distribution of a phase current deviation at a level of a section load 50A in a three-divided line according to the disconnection position detecting method according to the present invention. FIG.
FIG. 8 is an exemplary diagram showing a minimum value distribution of a phase current deviation at an interval load 50A level in a three-divided line according to the disconnection position detecting method according to the present invention. FIG.
9 is a view showing an example of a phase current deviation characteristic in a first line disconnection in a first section of a main trunk line using the disconnection position detection method according to the present invention.
FIG. 10 is an exemplary diagram showing the phase current deviation characteristics in the first section of the main line in FIG. 9; FIG.
FIG. 11 is an exemplary diagram showing a phase current deviation characteristic in a single line disconnection in the third section of the main trunk line in FIG. 9; FIG.
FIG. 12 is an exemplary diagram showing a phase current deviation characteristic during a 2-wire disconnection in a first section of a main trunk line using the disconnection position detection method according to the present invention;
FIG. 13 is an exemplary diagram showing a phase current deviation characteristic in a two-wire disconnection in a second section of a main trunk line in FIG. 12; FIG.
FIG. 14 is an exemplary diagram showing a phase current deviation characteristic in a two-wire disconnection in a third section of a main trunk line in FIG. 12; FIG.
15 is an exemplary view showing a characteristic of a phase current deviation in a first line disconnection in a first section of a branch line using the disconnection position detection method according to the present invention.
Fig. 16 is an exemplary diagram showing a phase current deviation characteristic in a two-wire disconnection in the first section of a branch line in Fig. 15; Fig.
17 is a flowchart for explaining a disconnection position detecting method according to the present invention.
FIG. 18 is a flowchart for more specifically explaining a method of determining a disconnection position (disconnection section) in FIG. 17; FIG.
19 is a view for explaining a method of utilizing a broken line position detecting device for a distribution line using a phase current deviation according to the present invention in a normal three-phase balanced load supply line.
FIG. 20 is an exemplary diagram for explaining a method of detecting a single wire failure using a disconnection position detecting device for a distribution line according to the present invention when a single line disconnection occurs in FIG. 19; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an apparatus and method for detecting disconnection of a distribution line using a phase current deviation according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 4 is a diagram illustrating a schematic configuration of an apparatus for detecting a broken-line position of a distribution line using a phase current deviation according to an embodiment of the present invention.

4, an apparatus for detecting a broken line position of a distribution line using a phase current deviation according to an exemplary embodiment of the present invention includes a distribution line detection unit for detecting a broken line section, (Or broken line) through the screen of the system (that is, the user interface unit) or outputting an alarm so that the broken line can be quickly responded to by operating the power distribution automation switch.

4, the disconnection position detecting apparatus for a distribution line using a phase current deviation according to an embodiment of the present invention includes a disconnection failure detecting unit 200, a disconnection position determining unit 210, a power distribution automation switch communication unit 231 A power distribution automation switch data management unit 232, a user interface unit 240, a disconnection display unit 241, and an input and control unit 242.

First, a user (that is, a power distribution center distribution system operator), through the input / control unit 242 of the user interface unit 240, determines a phase current measurement sequence for each power distribution line, an execution cycle of the single- And stores in the switch data management unit 232 whether or not the terminal end section is connected.

The power line breaker communication unit 231 is a means dedicated to communication with each of the power distribution automation switches. The break line failure detection unit 200 detects power line breakage in accordance with a measurement sequence preset by the user every time the phase current data of the power distribution automation switch needs to be acquired And obtains phase current data for each switch. The acquired data (i.e., the phase current data of each distribution automation switch) is stored in the distribution automation switch data management unit 232 for each switch.

The single-wire failure detecting unit 200 determines whether there is a single-wire failure using the obtained phase current data of each of the distribution automation switches. If it is determined that there is a single wire failure, the disconnection position determination unit 210 is executed to calculate the disconnection position (or disconnection section). The disconnection position determination unit 210 determines whether or not the information stored in the distribution automation switch data management unit 232 (for example, measurement order for each switch, phase current data for each switch, whether a terminal section is connected, Level information, etc.) is used to determine the disconnection position (or disconnection section).

When the disconnection position is determined, the disconnection position determining unit 210 transmits the result to the disconnection display unit 241 of the user interface unit 240. The disconnection diagram display unit 241 displays a phase current, a phase current deviation level, and a fault point on the disconnection diagram using the transmitted result, and alerts the user.

Accordingly, the user (that is, the person in charge of operation of the distribution center distribution system) instructs the input and control unit 242 to disconnect the corresponding distribution automation switches connected to the failure section by the input and control unit 242, And transmits a control command to the corresponding distribution automation switches via the switch communication unit 231 to perform a shutdown operation.

Hereinafter, a method of calculating a phase current deviation (or a deviation level) used for single-wire fault detection and disconnection position determination in the device according to the present invention, characteristics of the phase current deviation, Will be described with reference to the drawings of various embodiments.

Generally, a three-phase fault is often caused by natural disasters such as rain storms or general fault, and it is highly likely that the fault center is already known at the distribution center due to the report. And most of the line breaks are known as 1 ~ 2 line breaks. In addition, as described above, in the case of the three-phase disconnection, the voltage information measured by the distribution automation switch is basically used for the detection of the disconnection failure. However, there is a problem that the reliability of the voltage measurement result is poor.

Accordingly, the present invention provides a method of detecting a disconnection position using a phenomenon that a deviation of each phase current varies in each section when a wire is disconnected in one or two wires.

In other words, the present invention is aimed at detection of disconnection of one or two wires rather than a three-phase disconnection which is likely to occur due to an external accident and whose frequency is low. First, a situation of a steady state will be described in order to analyze what kind of characteristics the change of the current value of each phase of each section of the distribution line in the above disconnection of the first to second lines is.

5 is an exemplary diagram for explaining a phase current deviation characteristic in a steady state for each measurement interval in a main trunk distribution line using the disconnection position detection method according to the present invention.

As shown in FIG. 5, there are installed distribution automation switches 13, 14, 15 and 16 (hereinafter referred to as switches) for each section on the main trunk line of the distribution line, The load on the distribution line supplied up to the first switch 16 and the second switch 16 is 50A 51 between the first switch 13 and the second switch 14 and 20A 52 between the second switch 14 and the third switch 15, , And 30A (53) between the third switch 15 and the fourth switch 16.

At this time, the current value of each phase recorded in the terminal device (not shown) of each distribution automation switch is displayed by the phase current screen 63 considering only the terminal section load 30A in the case of the No. 3 switch 15, 14, a phase current screen 62 in which the current value 30A of the third switch 15 is added to the second load 20A between the second switch 4 and the third switch 15 is displayed. Likewise, in the case of the first switch 13, the current value 50A of the second switch 14 is also compared with the current value 50A obtained by adding the section load 50A between the first switch 13 and the second switch 14 to the phase current screen 61 ) Is displayed.

At this time, there are various definitions such as a method of representing the unbalance level of the current value (i.e., phase current) by using the symmetric component as shown in Equation (1).

However, since the host server 20 (see FIG. 1) processes information transmitted from a plurality of distribution lines for each distribution center, a method of minimizing the burden must be selected. Also, the symmetry component basically needs phase angle information for each phase current, but most terminal devices of the power distribution automation switch can not handle this.

Accordingly, in the present invention, Equation (2) representing the unbalance or deviation level (that is, the phase current deviation level) of the three-phase current is defined as RMS (Root Mean Square) value of each phase current through a plurality of program simulation analysis.

: 3상 전류 크기(RMS)의 평균,here,

: Average of three-phase current magnitude (RMS)

: 3상 전류 크기(RMS) 중 최소값을 의미한다.

: This is the minimum value among the three-phase current magnitudes (RMS).

Using Equation (2), the phase current deviation levels (71, 72, 73) in each distribution automation switch in the steady state can be calculated.

As shown in FIG. 5, when the phase currents (A, B, and C phases) of each distribution automation switch are perfectly balanced (that is, when they are in a normal state) regardless of the imbalance of the section load between the respective distribution automation switches, The deviation level is 0%.

6 is an exemplary diagram for explaining a phase current deviation characteristic in a steady state for each measurement interval in a distribution line extending from a main trunk line to a branch line using the disconnection position detection method according to the present invention.

FIG. 6 is a result of estimating the phase current deviation value after calculating the phase current measured at each switch assuming the load of each section of the distribution automation switch by extending to the branch line as well as the daytime line.

As shown in FIG. 6, the distribution automation switches 13, 14, 15, 16 for each section are provided on the main trunk line of the distribution line, and branching is performed between the second switch 14 and the third switch 15, The section load of the branch line is divided into 30A (55), 6A (55), and 6A (20) between the fifth switch 17 and the sixth switch 18, It is assumed that 20A (56) exists between the switch 18 and the seventh switch 19.

Since the phase currents (A, B, and C phases) of the distribution automation switches 13 to 19 are perfectly balanced, the phase current deviation levels 71, 72, 73, 75, and 76), it can be seen that all of them are in a normal state.

However, since the error of the current measured through CT (Current Transformer) of the power distribution automation switch is practically known to be about 3%, as shown in FIGS. 4 and 5, there is a steady state in which perfect phase current equilibrium exists It is difficult to do. Even if there is no error in current measurement, it is difficult to achieve perfect equilibrium between phase currents in actual distribution line.

Therefore, it is necessary to refer to the algorithm for disconnection detection by determining the range of the phase current deviation in the steady state. That is, a method of ignoring changes within a specific range (i.e., phase current deviation) is applied.

For reference, the domestic distribution line is designed as a three-segment standard based on the connection point. Although the number of actual distribution automation switches may be larger, it can be said that the main trunk line is similar to FIG. 1 in view of the design criteria.

로 지정하여 k에 상한 +10% 하한 -10% 사이에 난수를 발생시켜 300회 정도 모의 시뮬레이션 하여 각 배전자동화개폐기별 상전류 편차수준 중 최대값의 히스토그램을 도 7과 같이 산출하고, 최소값의 히스토그램을 도 8과 같이 산출하였다. 즉, 구간부하가 최대 +10%에서 최소 -10% 차이가 발생하므로 상전류 차이가 20% 가 될 수 있는 상황을 모의 시뮬레이션 한 것이다.In addition, since the current value of the reference phase angle of the substation of the substation is 150A on average, the load shown in FIG.

, And a random number between 10% lower limit and 10% upper limit is generated in k, and simulation is performed 300 times to calculate the histogram of the maximum value of the phase current deviation level of each distribution automation switch as shown in FIG. 7, and the histogram of the minimum value is calculated As shown in FIG. That is, the simulated result is that the phase current difference may be 20% because the difference between the maximum +10% and the minimum -10% of the sectional load occurs.

FIG. 7 is an exemplary view showing a maximum value distribution of a phase current deviation at an interval load 50A level in a three-division line according to the method of detecting a broken-line position according to the present invention, and FIG. 8 FIG. 4 is a graph showing a minimum value distribution of a phase current deviation at a level load of 50 A in a three-divided line; FIG.

As shown in FIG. 7, the average of the maximum values is about 6.4%, and the average of the minimum values is about 2.9%, as shown in FIG. 8, and the difference is about 3.5%.

However, it is necessary to consider that the worst situation can happen.

That is, as shown in FIG. 7, the maximum value upper limit is about 13%, and the minimum value lower limit is about 1% as shown in FIG. 8, so that the range is about 12%.

The phase current deviation in the steady state has been described above.

Hereinafter, the change of the phase current deviation of each section at the time of one wire disconnection will be described.

FIG. 9 is a diagram illustrating a phase current deviation characteristic in a first line of a main line in a first section of a main line using the method of detecting a position of a broken line according to the present invention, and FIG. FIG. 11 is an exemplary diagram showing a phase current deviation characteristic in a single line disconnection in the third section of the main trunk line in FIG. 9. FIG.

For convenience, the section load 51, 52, 53 between each distribution automation switch is the same as the previous section load (see Fig. 5), but the corresponding phase (any of A, B, C) , It is assumed that the section load current is reduced by half. Also, it is assumed that the actual current of the wire after the disconnection point is "0", and that the measurement current is represented by "2" due to measurement error.

9, when one line (for example, C-phase) disconnection occurs in the first section, 25A in which the section load current of the C-phase where the disconnection occurred is halved is measured in the No. 1 switch 13, It can be seen that the C-phase measurement current of the second switch 14 and the third switch 15 after the break-off point becomes "2 ".

When the phase current deviation level in each of the switches 13, 14 and 15 is calculated, 67% at the first switch 13, 94% at the second switch 14 and 90% at the third switch 15 It can be seen that the value increased when compared with the steady state. Also, it can be confirmed that the phase current deviation level calculated by the distribution automation switch immediately after the occurrence of the disconnection (that is, the second switch) is the maximum when compared with the phase current deviation level calculated by the other distribution automation switch.

As shown in FIG. 10, when one line (for example, C phase) disconnection occurs in the second section, 10A in which the section load current on the C phase where the disconnection occurred is halved is measured in the No. 2 switch 14, It can be seen that the C-phase measurement current of the third switch 15 after the break-off point becomes "2 ".

When the phase current deviation level in each of the switches 13, 14 and 15 is calculated, it is calculated as 31% at the first switch 13, 73% at the second switch 14, and 90% at the third switch 15 It can be seen that the value increased when compared with the steady state. In addition, it can be confirmed that the phase current deviation level calculated by the distribution automation switch (that is, the third switch) immediately after the section where the disconnection occurred is maximum compared with the phase current deviation level calculated by the other distribution automation switch.

11, when one line (for example, C phase) is broken in the third section (i.e., the end section), in the third switch 15, the section load current on the C phase where the break occurs is halved 15A is measured.

When the phase current deviation level in each of the switches 13, 14 and 15 is calculated, it is calculated 11% at the first switch 13, 22% at the second switch 14 and 40% at the third switch 15 It can be seen that the value increased when compared with the steady state.

However, when a disconnection occurs in the terminal section as described above, the phase current deviation of the switch (i.e., the third switch) immediately before the disconnection point is maximized.

As described above, the phase current deviation level at the single-wire disconnection is characterized in that the phase current deviation level measured by the power distribution automation switch immediately after the section where the disconnection occurs is the maximum, except when the disconnection occurs at the terminal section .

Hereinafter, the change in the phase current deviation according to the section when the two wires are disconnected will be described.

FIG. 12 is a diagram illustrating an example of a phase current deviation characteristic during a two-wire disconnection in a first section of a main trunk line using the disconnection position detection method according to the present invention. FIG. FIG. 14 is an exemplary diagram showing the phase current deviation characteristic in the second line disconnection in the third section of the main trunk line in FIG. 12. FIG.

For convenience, the section load 51, 52, 53 between each distribution automation switch is the same as the previous section load (see Fig. 5), but the corresponding phase (any of A, B, C) , It is assumed that the section load current is reduced by half. Also, it is assumed that the actual current of the wire after the disconnection point is "0", and that the measurement current is represented by "2" due to measurement error.

As shown in FIG. 12, when two lines (for example, B phase and C phase) are generated in the first section, in the first switch 13, 25A is measured, and the B-phase and C-phase measurement currents of the second switch 14 and the third switch 15 after the disconnection point become "2 ".

When the phase current deviation level in each of the switches 13, 14 and 15 is calculated, it is calculated 50% at the first switch 13, 89% at the second switch 14 and 82% at the third switch 15 , And the deviation level is smaller than that in the case where the 1-wire line breakage occurs. However, as in the case of a 1-wire line break, the phase current deviation level calculated by the distribution automation switch immediately after the break occurs (ie, the No. 2 switch) is larger than the phase current deviation level calculated by other distribution automation switches .

As shown in FIG. 13, when two lines (for example, B-phase and C-phase) are generated in the second section, the load currents of the B-phase and C- 10A is measured, and the B-phase and C-phase measurement currents of the third switch 15 after the disconnection point become "2 ".

When the phase current deviation level in each of the switches 13, 14 and 15 is calculated, it is calculated as 18% in the first switch 13, 57% in the second switch 14 and 82% in the third switch 15 , And the deviation level is smaller than that in the case where the 1-wire line breakage occurs. However, as in the case of the 1-wire breakdown, the phase current deviation level calculated by the power distribution automation switch immediately after the section where the disconnection occurred (ie, the No. 3 switch) is larger than the phase current deviation level calculated by the other distribution automation switch .

As shown in FIG. 14, when two lines (for example, B phase and C phase) are generated in the third section (i.e., the end section), the third switch 15 switches between the B- It can be seen that the load current is reduced by half and 15A is measured.

When the phase current deviation level in each of the switches 13, 14 and 15 is calculated, it is calculated as 6% in the first switch 13, 13% in the second switch 14 and 25% in the third switch 15 , And the deviation level is smaller than that in the case where the 1-wire line breakage occurs. However, when a disconnection occurs in the terminal section as described above, the phase current deviation of the switch (i.e., the third switch) immediately before the disconnection point is maximized.

As described above, the phase current deviation level at the time of the two-wire disconnection is characterized in that the phase current deviation level measured by the power distribution automation switch immediately after the section where the disconnection occurs is maximized except for the case where the disconnection occurs in the terminal section . Also, as in the case of the 1-wire disconnection, it can be seen that the phase current deviation of the switch immediately before the disconnection in the terminal section appears at the maximum.

Thus, the characteristics of the phase current deviation of each distribution automation switchgear are explained in the case where one or two wire disconnection occurs in the main trunk line.

Hereinafter, the characteristics of the phase current deviation of each power distribution automation switch will be described in the case where the failure of the first or second line break occurs in the branch line of the T-shaped line close to the actual power distribution line. A description will be given of whether the phase current deviation characteristic in the case where the main wire of the primary wire occurs in the case of the disconnection of the primary wire or the secondary wire is maintained even when a disconnection occurs in the secondary wire.

FIG. 15 is a diagram illustrating an example of phase current deviation characteristics during a single line disconnection in a first section of a branch line using the disconnection position detection method according to the present invention.

FIG. 15 is a result of estimating the phase current deviation value after calculating the phase current measured at each switch assuming the load of each section of the distribution automation switch by extending to the branch line as well as the main trunk.

As shown in FIG. 15, when the distribution automation switches 13, 14, 15 and 16 are installed in the main trunk line of the power distribution line, the power is supplied between the second switch 14 and the third switch 15 18A and 19B are provided in the branching branch line. The sectional load of the branching line is 30A (55) between the fifth switch 17 and the sixth switch 18, It is assumed that 20A (56) exists between the switch 18 and the seventh switch 19.

15, when one line (e.g., C-phase) is broken in the first section of the branch line, 15A in which the section load current of the C-phase where the breaking occurs is halved in the fifth switch 17 is measured , It can be seen that the C-phase measurement current of the No. 6 switch 18 after the disconnection point becomes "2 ".

When the phase current deviation level of each of the switches 13 to 19 is calculated, it is 17% at the first switch 13, 26% at the second switch 14, 0% at the third switch 15, 61% and 61% of the breaker 17 and 86 are calculated at the breaker 17 and the breaker 6, respectively, and the phase current deviation calculated by the breaker automation breaker immediately after the broken line (i.e., the breaker 6) (Ie, the third switch) in the main trunk line after the branch point (ie, the third switchgear) is not affected by the disconnection of the branch line since the phase current deviation is 0% .

As described above, the phase current deviation value 132 of the second switch 14 is increased to 26% from the phase current deviation value 131 of the first switch 13 by 17% and the phase current deviation value 132 of the second switch 14 The phase current deviation value 135 of the No. 5 breaker 17 in the branch line is increased to 61% and the phase current deviation value 136 is 86% in the No. 6 breaker 18 immediately after the break line Respectively. On the other hand, the phase current deviation value 133 of the third switch 15 in the main trunk line is 0%, which means that there is no difference from that before the occurrence of the disconnection.

It can be understood that the phase current deviation characteristic that occurs when a single line breakage occurs in the main trunk as described above can be applied to a case where a single line breakage occurs in the branch line.

FIG. 16 is an exemplary diagram showing the phase current deviation characteristic in the case of two wire breakage in the first section of the branch line in FIG.

For the sake of convenience, the description of the same configuration as that of FIG. 15 is omitted.

16, when two lines (for example, B-phase and C-phase) are broken in the first section of the branching line, in the fifth switch 17, the section load currents of the B- 15A is measured, and the B-phase and C-phase measurement currents of the No. 6 switch 18 after the disconnection point become "2 ".

When calculating the phase current deviation level in each of the switches 13-19, the first switch 13 is at 9%, the second switch 14 is at 15%, the third switch 15 is at 0% (17) and 44% (75%) in the 6th switch (18), respectively. It can be seen that the deviation level is smaller than that in the case of 1-wire short-circuit fault.

Therefore, it can be confirmed that the phase current deviation level calculated by the distribution automation switch immediately after the section where the disconnection occurred (ie, the switch 6) is the maximum when compared with the phase current deviation level calculated by the other distribution automation switch, It can be seen that the breaker in the main trunk (ie, the breaker 3) is not affected by breaking of the branch line because the phase current deviation is 0%.

The phase current deviation value 152 of the second switch 14 is increased to 15% from the 9th phase current deviation value 151 of the first switch 13 and the phase current deviation value 152 of the second switch 14 The phase current deviation value 155 of the No. 5 switch 17 in the branch line is increased to 44% and the phase current deviation value 156 is increased to 75% in the No. 6 switch 18 immediately behind the disconnection interval Respectively. On the other hand, the phase current deviation value 153 of the third switch 15 in the main trunk line is 0%, which is not different from that before the break occurs.

It can be understood that the phase current deviation characteristic that occurs when a two-wire single-wire fault occurs in the main trunk as described above can be applied to a case where a two-wire single-wire fault occurs in the branch line.

In the present invention, the phase current deviation characteristics calculated through Equation (2) are described in the case where one or two line breakage occurs in the main trunk line and the branch line.

Meanwhile, the distribution automation system as shown in FIG. 1 transmits and receives switch power and state information for each distribution automation switch through the master 20 and each communication channel 21 to 24, Command.

The distribution automation system periodically stores the current measured at each distribution automation switch for the load management of the distribution line. At this time, the current measurement time differs for each distribution automation switch, that is, the current measurement .

Recently, as the ratio of using optical communication has increased, FEP (Front-End Processor: a server dedicated to distribution automation system) which can polynchronize the data of all the distribution automation switches in the distribution line in time will be developed and supplied . Therefore, when the synchronous polling is performed, it is expected that the difference of the measurement time for each distribution automation switch may be reduced to 1 to 2 seconds or less. However, in the case of a current measurement type in which a plurality of communication methods are not time synchronized as in the present case, a difference in measurement time per switch may occur up to 50 minutes in one line.

Therefore, the disconnection position detection method according to the present invention is a method of determining a disconnection failure position according to a phase current deviation level, which is an unbalanced state between phase currents. Even if the measurement time of the switching period is different, There is an advantage that the measurement time of each switch is different. However, when the measurement time of each switch is different by 50 minutes, there arises a problem that the detection information can not be notified in real time at the occurrence of the disconnection.

Accordingly, in the present invention, in the present invention, forcible polling is performed according to a predetermined order by the user from the power source side to the load side every predetermined time or after a specific event is generated, and current is measured to detect the disconnection and disconnection position .

For example, as shown in Table 1, forcible polling is performed for the current measurement in which the time difference of the distribution automation switches is minimized. Herein, the current measurement order is determined from the power supply side to the load side, and the end section is a section between the third switch 15 and the fourth switch 16 in Fig. 15 and a section between the sixth switch 18 and the seventh switch 19 .

Table 1 shows the measurement procedure and additional data (for example, whether the switch is connected to the power supply side of the terminal section) according to the present invention.

17 is a flowchart for explaining a disconnection position detecting method according to the present invention.

As shown in FIG. 17, the disconnection position detection process according to the present embodiment is executed at a predetermined period or at a specific time preset by the user (S101). When a predetermined event (that is, an externally executed event) (S102).

Here, the external execution event is triggered by another single wire failure detection system or is forcibly generated by the user, and can be interrupted regardless of the existing program loop operation.

When the specified period or specific time is reached, the single-wire failure detecting unit 200 sequentially obtains the phase current of each distribution automation switch through forced polling according to the measurement sequence set in Table 1 (S103). Acquisition of the phase current of each of the distribution automation switches is performed for all the distribution automation switches set in Table 1 (S104)

The single-wire failure detecting unit 200 calculates the phase current deviation level using the collected phase current data (S105). At this time, the calculated phase current deviation level is stored in the distribution automation switch data management unit 232 for each distribution automation switch. Then, it is determined whether the phase current deviation level value is increasing according to the measurement sequence defined in Table 1 (S106).

The following equation (3) can be used to determine whether the phase current deviation level value is increasing.

Here, D: phase current deviation level,

        i, j: Index indicating measurement order (i is faster than j)

: 사용자가 지정한 오차 수준(%)을 의미한다.

: It means the error level (%) specified by the user.

If the calculated phase current deviation level shows a tendency of increasing the phase current deviation level value according to the measurement sequence defined in Table 1 (YES in S106), it can be determined that the single wire failure has been detected.

If it is determined that the single wire failure is detected as described above, the single wire positioning unit 210 performs a process of detecting a disconnection position (or a disconnection section). That is, the disconnection position (disconnection section) is determined according to the position of the distribution automation switch in which the maximum value of the phase current deviation level is present (S107).

FIG. 18 is a flowchart for explaining the method of determining the disconnection position (disconnection section) in more detail in FIG. 17, wherein the disconnection position determining section 210 calculates the disconnection phase difference It is determined whether the distribution automation switch in which the maximum value of the level is generated is generated in the switch connected directly to the power source of the terminal section (S201).

Referring to FIG. 14, the terminal section means the third switch 15 and the fourth switch 16, and the switch connected directly to the power source of the terminal section means the third switch 15. Accordingly, the switch connected to the power source of the switch connected directly to the power source of the terminal section (i.e., the switch No. 3) means the switch No. 2.

If the calculated maximum value of the phase current deviation level is generated in a switch that is not directly connected to the power source side of the terminal section (NO in S201), it is determined that a short-circuit failure occurs in the power source side section of the switchgear where the maximum value occurs S202).

However, if the maximum value of the calculated phase current deviation level is generated in the switch connected directly to the power source side of the terminal section (YES in S201), the maximum value (i.e., the phase current deviation level (S203). In the case where the maximum value of the open-circuit breaker of the open-circuit breaker is less than the load breaker breakage of the switch,

: 말단구간의 전원측에 직접 연결된 개폐기와 그 개폐기의 전원측에 연결된 개폐기간의 상전류값 중 최대값들의 차이를 의미하고,

은 상전류값 중 최소값들의 차이를 의미한다. 즉,

은 정상적인 상전류의 차이를 의미하고,

은 단선고장으로 인해 줄어든 상전류의 차이를 의미한다. 그리고

은 사용자가 지정한 오차 수준(%)을 의미한다.here,

: The maximum value of the phase current values of the switchgear connected directly to the power source side of the terminal section and the phase current of the switchgear connected to the power source side of the switchgear,

Means the difference between the minimum values of the phase current values. In other words,

Means a difference in normal phase current,

Means the difference in phase currents due to the breakdown failure. And

Means the error level (%) specified by the user.

)와 단선고장으로 인해 줄어든 상전류의 차이(

)를 통해 단선위치가 말단구간의 전원측에 직접 연결된 개폐기의 앞(전원측 구간)인지 뒤(부하측 구간) 인지를 판단하기 위한 것이다.In other words, Equations (4) and (5) show the difference in the normal phase current in the open / close period connected to the power source of the switch connected directly to the power source side of the terminal section

) And the difference in phase currents due to breakdown failure (

To determine whether the disconnection position is in front of the switch (power source side section) or rear side (load side section) directly connected to the power source side of the terminal section.

과

이 차이가 없으면 그 구간(예 : 도 14의 2번 개폐기와 3번 개폐기 사이) 자체의 구간부하는 일정하므로(즉, 도 14의 A상에서 50-30=20, B상과 C상에서 35-15=20으로 구간부하가 일정하므로) 문제가 없으며, 그 다음 부하측 구간에서 문제가 발생했음을 의미하는 것이다. 반대로,

과

이 차이가 있으면(즉, 도 13의 A상에서 50-30=20, B상과 C상에서 10-2=8로 차이가 있으면) 그 구간(예 : 도 13의 2번 개폐기와 3번 개폐기 사이) 자체의 일부단선으로 인해 부하량이 변경되었음을 의미하는 것이다. In other words,

and

If there is no such difference, the sectional load of the section itself (for example, between the second switch and the third switch in Fig. 14) is constant (i.e., 50-30 = 20 on A in Fig. 14, 35-15 = 20, so that there is no problem), which means that a problem has occurred in the next load side section. Contrary,

and

(I.e., between 50 and 30 = 20 on A in Fig. 13 and between 10 and 2 = 8 on B and C), the interval (e.g., between the second switch and the third switch in Fig. 13) Which means that the load has changed due to some disconnection of itself.

과

이 차이가 없어도 계측 오차로 인해 그 차이가 "0"이 된다는 보장이 없으므로, 그 차이가

의

이내이면 차이가 없는 것으로 간주하고, 반대로 그 차이가

의

을 초과하면 차이가 있는 것으로 간주 한다.However, in equations (4) and (5)

and

Even if there is no difference, there is no guarantee that the difference will be "0 " due to the measurement error.

of

If there is no difference, then the difference is considered

of

It is considered to be different.

Meanwhile, the disconnection position detecting apparatus for a distribution line using the phase current deviation according to the present invention may be used for protecting the three-phase balanced load supply line. That is, the present invention can be usefully used as a method of protecting the line when the three-phase balanced load supply line is long, by monitoring the phase current deviation level.

FIG. 19 is a diagram for explaining a method of utilizing a broken line position detecting apparatus for a distribution line using a phase current deviation according to the present invention in a normal three-phase balanced load supply line. FIG. FIG. 20 is an exemplary diagram for explaining a method of detecting a wire breakage failure by using a breakage position detecting apparatus for a distribution line according to the present invention when a one-wire breakage occurs in FIG. 19; FIG.

As shown in Fig. 19, the three-phase balanced load supply line for the customer includes a transformer 300, a current transformer 301, a disconnection position detecting device 302 for a distribution line using the phase current deviation according to the present invention, 303, a three-phase balanced load 304 requiring a three-phase balanced power supply other than the electric motor, and a three-phase motor load 305 are connected.

If it is assumed that the customer three-phase balanced load supply line is in a steady state, the phase current deviation level calculated by the broken line position detecting apparatus 302 using the phase current deviation according to the present invention is 0% . That is, it can be understood that the three-phase balanced load supply line is in a normal state.

However, when a disconnection (or ground fault) occurs in any one line as shown in Fig. 20, the phase current deviation level calculated by the disconnection position detecting device 302 of the distribution line using the phase current deviation according to the present invention 40%) increases sharply. If the user exceeds a predetermined value, the circuit breaker 303 is opened to protect the line.

As described above, according to the present invention, it is not only impossible to perform measurement in a spherical terminal device, but also allows measurement of phase angle and voltage data with low reliability due to a change in the position of each phase in the distribution line, It is possible to improve the reliability and promptness by detecting the disconnection position by quickly measuring the reliable current value (RMS) on a phase-by-phase basis.

Also, the present invention is applicable to a distribution line having a distributed power source. Further, the present invention can be implemented by changing or improving some hardware or software of an existing distribution automation system, thereby reducing the cost economically.

Also, according to the present invention, it is possible to prevent electric shock, fire accident and quick follow-up through accurate and rapid detection of a single-wire fault position due to improvement of a single wire fault detection capability, thereby reducing a customer's rejection of equipment or service, It is possible to reduce the cost.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

11: Substation 13 ~ 19: Power distribution automation switch
200: single wire failure detection unit 210: disconnection position determination unit
231: Power distribution automation switch communication unit 232: Power distribution automation switch data management unit
240: user interface unit 241: disconnection display unit
242: Input and control unit 300: Transformer 300:
301: Current transformer 302: Disconnection position detecting device
303: Three phase breaker 304: Three phase phase load
305: Three-phase motor load

Claims (19)

A switch data management unit for storing at least one or more pieces of information on a phase current measurement order of each switch according to a distribution line, phase current data for each switch, whether or not a terminal section of each switch is connected, and phase current deviation level information for each switch;
A single-wire fault detecting unit for measuring or obtaining the phase current data for each switch, calculating a phase current deviation level for each switch, and detecting whether the single-wire fault is broken for each distribution line using the phase current deviation level information; And
And a disconnection position determining unit for determining a disconnection position using information stored in the switch data management unit when it is determined that a disconnection failure occurs in the distribution line through the disconnection failure detecting unit,
Wherein the switch is an electric power distribution automation switch.
The method according to claim 1,
And a communication unit for communicating with each of the switches in order to measure or obtain the phase current. The apparatus for detecting a breaking position of a distribution line using a phase current deviation.
The method according to claim 1,
And a user interface unit for displaying a phase current and a phase current deviation level and a fault point for each of the switches according to the disconnection position and outputting an alarm to the user when the disconnection position is estimated, Of the disconnection position detecting device.
2. The method according to claim 1,
Average of three-phase current magnitude (RMS)

) And the minimum value of the three-phase current magnitude (RMS)

) Difference

(RMS) of the three-phase current magnitude (RMS)

) Is multiplied by 100 to calculate a disconnection position of the distribution line using the phase current deviation.
2. The fault diagnosis apparatus according to claim 1,
Wherein the phase current is measured or acquired for each switch by forced polling according to a phase current measurement sequence of a preset switch.
2. The fault diagnosis apparatus according to claim 1,
And when it is determined that the phase current deviation level calculated for each switch is increasing according to the measuring sequence of each switch, it is determined that there is a single-wire fault in the power distribution line.
7. The apparatus according to claim 6, wherein the single-
Measurement order is slow phase current deviation level (

) And the fast phase current deviation level (

) Is smaller than a preset error level (

) Is out of range

), And the phase current deviation level is increasing.
The error level (

) Is preset in consideration of the error in the current measurement and the unbalance of each section by the distribution line, and the disconnection position detection device for the distribution line using the phase current deviation.
2. The apparatus according to claim 1,
When the maximum value of the phase current deviation level of each switch is not generated in the switch connected to the terminal section power source side, it is determined that the single-wire failure has occurred in the power source side section of the switchgear in which the maximum value of the phase current deviation level is generated Disconnection position detection device for distribution line.
9. The apparatus according to claim 8,
If the maximum value of the phase current deviation level is generated in the switch connected directly to the terminal section power source side, the difference between the maximum values of the phase current values of the switch section directly connected to the terminal section power source side and the power source side of the switch section

) And the difference between the minimum values of the phase current values

) And the difference value between them

),
The difference value (

) This'

, It is judged that a single wire failure has occurred in the load section of the switch in which the maximum value of the phase current deviation level is generated,
The difference value (

) This'

, It is determined that a breakdown has occurred in a power supply section of the switch in which the maximum value of the phase current deviation level is generated, and the breakage position detection device for the breakage line using the phase current deviation.
Measuring or acquiring phase current data for each switch;
Calculating a phase current deviation level for each switch;
Determining whether a single wire failure occurs in each of the power distribution lines using the phase current deviation level information; And
And determining a disconnection position using the phase current data and the phase current deviation level for each switch when it is determined that there is a disconnection fault in the distribution line,
Wherein the switch is an electric power distribution automation switch.
11. The method of claim 10,
Further comprising the step of storing at least one or more pieces of information on a phase current measurement sequence of each switch connected to the distribution line, phase current data for each switch, whether or not a terminal section of each switch is connected, and phase current deviation level information for each switch, A method of detecting a disconnection position of a distribution line using an optical fiber.
11. The method of claim 10, wherein determining the disconnection position comprises:
Wherein the determination is performed when a predetermined period, a specific time, or a preset specific event is generated.
11. The method of claim 10,
Further comprising the step of displaying a phase current and a phase difference level and a fault point for each of the switches on the disconnection diagram and outputting an alarm to the user when the disconnection position is estimated, Position detection method.
[11] The method of claim 10,
Average of three-phase current magnitude (RMS)

) And the minimum value of the three-phase current magnitude (RMS)

) Difference

(RMS) of the three-phase current magnitude (RMS)

) Is multiplied by 100 to calculate the disconnection position of the distribution line using the phase current deviation.
11. The method according to claim 10,
Wherein the phase current is measured or acquired for each switch by forced polling according to a phase current measurement sequence of a preset switch.
The method as claimed in claim 10,
Wherein when it is determined that the phase current deviation level calculated for each switch is increasing according to the measuring sequence of each switch, it is determined that there is a single-wire fault in the power distribution line, and detecting the disconnection position of the power distribution line using the phase current deviation.
17. The method of claim 16,
Measurement order is slow phase current deviation level (

) And the fast phase current deviation level (

) Is smaller than a preset error level (

) Is out of range

), And the phase current deviation level is increasing.
The error level (

) Is preset in consideration of the error in the current measurement and the unbalance of each section by the distribution line, and a method of detecting the disconnection position of the distribution line using the phase current deviation.
11. The method of claim 10, wherein determining the disconnection position comprises:
When the maximum value of the phase current deviation level of each switch is not generated in the switch connected to the terminal section power source side, it is determined that the single-wire failure has occurred in the power source side section of the switchgear in which the maximum value of the phase current deviation level is generated Disconnection position detection method for distribution line.
19. The method of claim 18, wherein determining the disconnection position comprises:
If the maximum value of the phase current deviation level is generated in the switch connected directly to the terminal section power source side, the difference between the maximum values of the phase current values of the switch section directly connected to the terminal section power source side and the power source side of the switch section

) And the difference between the minimum values of the phase current values

) And the difference value between them

),
The difference value (

) This'

, It is judged that a single wire failure has occurred in the load section of the switch in which the maximum value of the phase current deviation level is generated,
The difference value (

) This'

, It is determined that a breakdown occurs in the power supply side of the switch in which the maximum value of the phase current deviation level is generated, so that the breakage of the power supply line is detected.

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