KR102338272B1 - System for detecting fault distribution line, Method thereof, and Computer readable storage medium having the same method - Google Patents

Abstract

Disclosed is a distribution line abnormality detection system capable of reliably detecting disconnection/phase loss. The distribution line abnormality detection system includes a switchgear body installed in a switchgear connected to a distribution line and generating measurement data by measuring electric power flowing to the switchgear, and a control terminal for detecting abnormalities in the distribution line using the measurement data It is characterized in that it includes a device.

Description

Distribution line abnormality detection system, method thereof, and computer readable storage medium having this method

The present invention relates to a distribution line abnormality detection technology, and more particularly, to a distribution line abnormality detection system and method for detecting disconnection/phase loss on a distribution line.

In general, as a method to cut off power by detecting a disconnection accident in a distribution line, a line switchgear (eg, Sectionalizes, Recloser, etc.) that blocks the spread of an accident in a distribution line or OCR (overcurrent relay) of a substation monitoring panel, OCGR (overcurrent The fault current was detected, such as ground fault relay), and the circuit breaker was operated to block the fault line.

However, overhead distribution lines in downtown are equipped with insulated wires, so in case of an actual disconnection accident, the wires touch the ground, but there are cases where the conductor does not touch the ground due to insulation coating or other reasons, so that the fault current does not flow. In addition, the fault current detection device does not detect the ground fault because the ground is not grounded due to the structures in the city center, so the circuit breaker does not cut off the accidental power. There is an increasing trend in the loss of peripheral devices.

In addition, when a disconnection accident occurs, field workers must visually check the location of the faulty distribution line and manually operate it, so it takes a lot of time to cut off the power, making it defenseless against electric shock and material accidents for a long time.

In order to solve this problem, the distribution automation system (DAS: Distribution Automation System) that monitors, measures, and controls the status of the distribution line Based on the phase voltage (13.2 kV), only the off level (50% of the reference voltage) was judged to detect the occurrence of disconnection/phase loss. In this case, if the measurement is below the 1-phase or 2-phase off level, it is detected as disconnection/phase-opening, but if the measurement is below the 3-phase mode off-level, it is recognized as an oblique state and detected as disconnection/phase-opening.

In particular, a capacitor voltage detector (CVD) or a register voltage detector (RVD) is used as a voltage measurement method. Therefore, since the induced voltage is used instead of the actual measured value, the accuracy is lowered, and the fluctuation range of the measured value is large depending on the ambient temperature because it is greatly affected by the external environment due to the characteristics of the detector. Accordingly, there is a problem in that reliability is lowered.

In addition, as a warning sound due to a small error is continuously generated during operation, it is treated as a non-critical alarm due to the cause of business disruption. Accordingly, there is a problem in that there is a high probability of a safety accident occurring in a situation in which wire disconnection is not recognized, and no action is taken for such an ignorance. In addition, there is a problem in that excessive repair costs occur due to disconnection/phase loss misinformation.

1. Korean Patent Publication No. 10-2016-0034677

The present invention has been proposed to solve the problems according to the above background art, and an object of the present invention is to provide a distribution line abnormality detection system and method capable of reliably detecting when disconnection/phase loss occurs.

Another object of the present invention is to provide a distribution line abnormality detection system and method capable of changing operation from a non-critical alarm to an important alarm by setting the generation rate of disconnection/phase-loss misinformation to zero.

The present invention provides a distribution line abnormality detection system capable of reliable detection in case of disconnection/phase loss in order to achieve the above object.

The distribution line abnormality detection system,

a switchgear main body installed in a switchgear connected to a distribution line and generating measurement data by measuring the electric power flowing through the switchgear; and

and a control terminal device that detects an abnormality in the distribution line by using the measurement data.

In addition, the measurement data is characterized in that it includes both a voltage detection value (V) and a current detection value (I).

In addition, the switch body may include a measurement unit configured to generate the measurement data.

In this case, the measuring unit is characterized in that it includes a current sensor generating the current detection value and a voltage sensor generating the voltage detection value.

In addition, the current sensor is characterized in that the 1000:1 annular CT (Current Transformer).

_{In addition, the control terminal device calculates a three-phase voltage (V 3-PHASE} ) using the voltage detection value and the current detection value, and compares the three-phase voltage (V _3-PHASE ) with a preset reference value, , and generating and outputting alarm information on the abnormality according to the comparison result.

In addition, the current sensor is installed in any one of the three-phase input terminals of the switchgear, and the voltage sensor is installed in the other one of the three-phase input terminals.

Also,

(여기서, V : 개폐기로부터 전송된 계측 전압 크기를 나타내는 전압 검출값, I : 개폐기로부터 전송된 계측 전류 크기를 나타내는 전류 검출값, v phase off level : 전압상실 판단 위해 설정된 전압 기준값, i off level : 전류를 상실(0)로 판단하기 위해 설정된 전류 기준값, off time : 알람 정보를 발생시키기 위한 상태 검출 유지 시간, + : AND 조건)으로 정의되는 것을 특징으로 한다.The three-phase voltage (V _3-PHASE ) is the equation

(here, V: voltage detection value indicating the magnitude of the measured voltage transmitted from the switchgear, I: current detection value indicating the magnitude of the measured current transmitted from the switchgear, v phase off level: the voltage reference value set to determine the voltage loss, i off level: It is characterized in that it is defined as a current reference value set to determine the current as loss (0), off time: state detection holding time for generating alarm information, +: AND condition).

In addition, after the alarm information is generated, if the voltage detection value V is greater than the voltage reference value (v phase off level), the alarm information is released.

In addition, after the alarm information is generated, if the current detection value I is greater than the current reference value i off level, the alarm information is released.

In addition, the above abnormality is characterized in that the disconnection and phase loss of the distribution line.

On the other hand, another embodiment of the present invention comprises the steps of: (a) generating measurement data by a switch body installed in a switch connected to a distribution line by measuring the electric power flowing to the switch; and (b) detecting, by the detecting control terminal device, an abnormality in the distribution line using the measurement data.

On the other hand, another embodiment of the present invention provides a computer-readable storage medium storing a program code for executing the above-described distribution line abnormality detection method.

According to the present invention, by applying a complex condition of voltage on/off level and current on/off level, it is possible to reliably detect disconnection/phase loss.

In addition, as another effect of the present invention, it is possible to ensure reliable detection and to eradicate the occurrence of erroneous information by judging by a complex condition.

In addition, as another effect of the present invention, it utilizes the current ON/OFF LEVEL (ON: 5A /OFF: 4A), which is a condition for distinguishing a dead wire/live wire in a re-automation device. that can be achieved.

1 is a block diagram of a distribution line abnormality detection system according to an embodiment of the present invention.
FIG. 2 is a detailed configuration block diagram of the switchgear body and the control terminal device shown in FIG. 1 .
3 is a flowchart illustrating a distribution line abnormality detection process according to an embodiment of the present invention.
4 is a conceptual diagram illustrating an alarm generation condition according to a distribution line abnormality according to an embodiment of the present invention.
5 is a view showing the A-phase disconnection/phase loss test results according to an embodiment of the present invention.
6 is a view showing the A and B phase disconnection/phase loss test results according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each figure, like reference numerals are used for like elements. Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. shouldn't

Hereinafter, a distribution line abnormality detection system and method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a distribution line abnormality detection system 100 according to an embodiment of the present invention. Referring to FIG. 1 , the distribution line abnormality detection system 100 may be configured to include a switch body 110 , a control terminal device 120 , a main device 130 , and the like.

The switch 10 performs a function of opening and closing a faulty section according to a remote control command of the main device 130 . The switchgear 10 is an intelligent switchgear and is a facility that executes the final command of the system. Examples of such intelligent switchgear include ground-mounted multi-circuit switchgear, multi-circuit breaker for underground lines, process gas insulated switchgear for overhead lines, Eco-switchers, and electronic reclosers.

The switch body 110 is installed in the switch 10 to check the state of the switch 10 , to perform an on/off operation, and to measure voltage and/or current.

The control terminal device 120 is configured between the switch body 110 and the main device 130 , and performs a connection function between the switch body 110 and the main device 130 . The control terminal device 120 receives a command from the main device 130 and transmits it to the switch body 110 to remotely operate, remote control, and remote correct the switch 10, and transmit the result to the main device 130. It plays the role of sending In addition, the current and/or voltage flowing through the intelligent switchgear is measured or a change in the closed/open state is detected and transmitted to the main device 130 .

The control terminal device 120 is divided into a basic type, a multi-function type, an integrated type, and a door attachment type according to the system situation and/or installation purpose, and in some models, voltage drop (Voltage Sag), voltage change (Voltage Swell), and interruption (Interruption) ), a function to detect instantaneous deterioration of electrical quality such as harmonics may be built-in.

The main device 130 may be composed of a computer and a communication system that play a role of performing remote monitoring, remote control, remote measurement, and remote correction functions of the control terminal device 120 located on the distribution line. In addition, there is software that performs various application functions, such as reducing the blackout section and shortening the power outage time by automatically collecting operation information such as voltage and current and checking the power outage section in the event of a failure.

The main device 130 is configured by combining a workstation and a personal computer (PC), and the number of combined unit devices varies according to the scale of the system. The metropolitan type is a server in charge of system management and troubleshooting functions, a control console that performs HMI (Human & Machine Interface) functions, a node that manages data and/or reports, and a simulation node that performs education and training functions, and a printer server. , and a network represented by a local area network (LAN).

The control terminal device 120 and the main device 130 are connected through a power communication network (not shown). It refers to a network configured for communication by sending data signals to an existing power line using PLC (Power Line Communication) technology. The power line consists of a high-voltage power line (about 22.9 kV) and/or a low-voltage power line (about 110-220 V). In addition, the power communication network may include a repeater, a power communication modem, a transformer, and the like.

Of course, in addition to these power networks, public switched telephone network (PSTN), public switched data network (PSDN), integrated services digital networks (ISDN), broadband ISDN (BISDN), local area networks (LAN: Local) area network), metropolitan area network (MAN), wide area network (WLAN), etc. However, the present invention is not limited thereto, and CDMA (Code Division Multiple Access) which is a wireless communication network. , WCDMA (Wideband Code Division Multiple Access), Wibro (Wireless Broadband), WiFi (Wireless Fidelity), HSDPA (High Speed Downlink Packet Access) network, Bluetooth (bluetooth), NFC (Near Field Communication) network, satellite broadcasting network, analog It may be a broadcast network, a Digital Multimedia Broadcasting (DMB) network, or the like. Alternatively, it may be a combination of these wired communication networks and wireless communication networks.

In addition, the main unit 130 analyzes the data monitored and measured by the control terminal device 120 to determine and record various states of the line, control the state of the facility according to the situation, determine the occurrence of an abnormality on the distribution line, and alarm It performs the function of generating information.

A current sensor 101 is installed at the input terminal of one phase (eg, A phase) of the switch 10 for current detection. This current sensor 101 may be a 1000:1 annular current transformer (CT). This is to eliminate misinformation to zero.

In addition, a voltage sensor 102 is installed at the output terminal of one phase (eg, B phase) of the switch 10 for voltage detection.

FIG. 2 is a detailed configuration block diagram of the switch body 110 and the control terminal device 120 shown in FIG. 1 . Referring to FIG. 2 , the switch body 110 may include a state check unit 211 , a body contact 212 , a measurement unit 213 , an electrode operation unit 214 , and the like.

The state check unit 211 performs a function of confirming the open/close state of the switch 10 . In other words, the state check unit 211 performs a function of confirming the input or open state of the switch 10 . In other words, when a movable contact (not shown) comes into contact with a fixed contact (not shown) due to movement by the switching means in the form of a combination of the switching means, the switch 10 is electrically connected between the same electrode terminals as input. On the other hand, when the movable contact is separated from the fixed contact, the electrical connection between the same electrode terminals is released by opening. The switching means may be a thermal relay, a solenoid, or the like.

The main body contact 212 becomes a movable contact connecting the switch body 110 and the switch 10 .

The measurement unit 213 performs a function of generating measurement data by measuring the voltage and/or current flowing into the switch 10 . The measuring unit 213 may include a current sensor 101 for detecting a current and a voltage sensor 102 for detecting a voltage. As the current sensor 101, as shown in FIG. 1, a CT (Current Transformer) type current sensor is mainly used, but is not limited thereto, and a Hall sensor, a fiber optic current sensor, and the like may also be used. The voltage sensor 102 may be a Potential Transformer (PT).

The electrode operation unit 214 performs a function of moving the movable contact using this switching means.

The control terminal device 120 may include an assembling unit 221 , a signal processing unit 222 , a control unit 223 , a communication unit 224 , and an output unit 224 . The collecting unit 224 is connected to the measuring unit 213 of the switch main body 110 to collect the voltage (v) and the current (i). The aggregator 224 may be composed of an IC (Integrated Circuit) chip or the like to collect signals.

The signal processing unit 222 performs a function of processing the voltage and current of the collected analog values into signals of digital values. The signal processing unit 222 may include a digital signal processor (DSP), a memory, and the like.

The control unit 223 detects an abnormality in the distribution line by using a digital value signal, and performs a function of generating it as alarm information. To this end, the control unit 223 may be composed of a microprocessor, a memory, or the like.

Memory includes flash memory disk (SSD: Solid State Disk), flash memory, EEPROM (Electrically erasable programmable read-only memory), SRAM (Static RAM), FRAM (Ferro-electric RAM), PRAM (Phase-change RAM), MRAM It may be composed of a combination of non-volatile memory such as (Magnetic RAM) and/or volatile memory such as Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate-SDRAM (DDR-SDRAM), etc. .

The communication unit 224 transmits measurement data, alarm information, status check information for checking the open/closed state of the switch 10 to the main device 130 . To this end, the communication unit 224 may include a modem, a circuit element, and the like. Although FIG. 2 shows that the switch body 110 and the control terminal device 120 are directly connected through a wired connection, a wired or wireless connection is also possible through a modem. That is, a modem may also be installed in the switchgear body 110 .

The output unit 224 performs a function of displaying alarm information. To this end, the output unit 224 may include a display, a warning light, a sound system, and the like. Accordingly, a combination of graphics, text, and voice is possible for alarm information.

3 is a flowchart illustrating a distribution line abnormality detection process according to an embodiment of the present invention. Referring to FIG. 3 , current (i) and voltage (v) are simultaneously measured through the measuring unit 213 (steps S310-1 and S310-2).

Thereafter, it is checked whether the detected values (I, V) of the current (i) and the voltage (v) are zero (0) (steps S320-1 and S320-2).

As a result of the check, if the detection values are not zero, it is checked whether the detection values are less than or equal to a preset reference value (steps S330-1 and S330-2). In other words, the current detection value I is compared with a preset reference value 1 (i phase off level), and if the current detection value I is less than or equal to the reference value 1 (i off level), the process proceeds to step S330-2 becomes (step S330-1).

The voltage detection value (V) is compared with a preset reference value 2 (v phase off level), and if the voltage detection value (V) is less than or equal to the reference value 2, the detection holding time (off time) is compared with a preset value ( Steps S330-2, S350). In other words, the detection time means the time for maintaining the state of the detection value. The set value can be about 3 seconds. If the voltage and current meet the criteria and the state to generate an alarm, the detection holding time should be 4 seconds.

In step S350, if the detection holding time (off time) is less than a preset setting value, the 'disconnection/image loss' cancellation step proceeds (step S371). A disconnection indicates a state in which the lines are not connected to each other. A phase loss is a case in which the circuit of any one of the three phases is disconnected, and it indicates a state in which the voltage of any one of the three phases does not come out.

On the other hand, if the detection holding time (off time) is greater than the set value in step S350, the control unit (223 in FIG. 2 ) compares the three-phase voltage (V _3-PHASE ) with a preset reference value 3 (step S360). In other words, the three-phase voltage (V _3-PHASE ) is expressed by the following equation.

Here, V: voltage detection value indicating the magnitude of the measured voltage transmitted from the switch

I: Current detected value indicating the magnitude of the measured current transmitted from the switch

v phase off level: Voltage reference value set to determine voltage loss ( less than 50% of distribution system phase voltage 13200V)

i off level : Current reference value set to judge current loss (0) ( less than 4A of diagonal reference current on distribution automation system)

off time: state detection holding time for voltage and current to satisfy the standard condition and generate alarm information (approximately 4sec)

+ : AND condition

Accordingly, when the three-phase voltage V _3-PHASE is greater than the preset reference value 3 in step S360, the control unit 223 generates alarm information indicating that 'disconnection/phase loss' has occurred (step S372).

On the other hand, in steps S320-1 and 320-2, if the detected values (V, I) are 0, the alarm information of 'disconnection/phase loss' is released (step S371.).

In addition, after the 'disconnection/phase loss' alarm occurs, when one or more of the following conditions are completed, the alarm information is released (steps S340-1, S340-2).

① V > v phase off level

② I > i off level

In other words, 'disconnection/phase open' alarm generation determination satisfies the condition that the phase voltage V is less than the Phase Off Level, the phase current is less than 4A, and the set time is exceeded.

On the other hand, the 'disconnection/phase open' alarm cancellation determination satisfies the condition that the phase voltage V exceeds the Phase On Level or the phase current exceeds 5A.

4 is a conceptual diagram illustrating an alarm generation condition according to a distribution line abnormality according to an embodiment of the present invention. Referring to FIG. 4 , it can be summarized as follows.

division Instrumentation
standard Generation standard (reference voltage 13.2kV) ON level OFF level GA, PA Voltage 80% (10.5kV) 50% (6.6kV) RA gas insulated type Voltage 80% (10.5kV) 50% (6.6kV)

Here, GA, PA, and RA are types of switchgear. That is, GA is a gas insulated switchgear for automation, PA is a polymer insulated switchgear, and RA is a recloser.

5 is a view showing the A-phase disconnection/phase-opening test results according to an embodiment of the present invention, and FIG. 6 is a view showing the A- and B-phase disconnection/phase opening test results according to an embodiment of the present invention. 5 and 6 , the test criteria are as follows.

measurement standard ON Level OFF Level setting Voltage (132 kV) 80% (105 kV) 50% (66 kV) ○ electric current 5A 4A Ⅹ (fixed to source)

The test conditions are as follows.

1) Voltage condition

○ Voltage Phase On Level (80%) : 10.56 [kV]

○ Voltage Phase Off Level(50%) : 6.6 [kV]

2) Current condition

○ Current Phase On Level : 5 [A]

○ Current Phase Off Level : 4 [A]

The phase A disconnection phase forming test in FIG. 5 is as follows.

○ Test 1: Set the phase current to 0 [A] and decrease the A phase voltage step by step

○ Test 2: Set the phase voltage to 0 [kV] and increase the phase A current after decreasing step by step

○ Test 3: Decrease A-phase voltage and A-phase current step by step at the same time

In FIG. 6 , the phase A and B phase disconnection tests are as follows.

○ Test 1: Set the phase current to 0 [A] and decrease the A and B phase voltages step by step

○ Test 2: Set the phase voltage to 0 [kV] and increase the A and B phase currents step by step

○ Test 3: A, B phase voltage and A, B phase current are simultaneously reduced step by step

In addition, the steps of the method or algorithm described in relation to the embodiments disclosed herein are implemented in the form of program instructions that can be executed through various computer means such as a microprocessor, a processor, a CPU (Central Processing Unit), etc. It can be recorded on any available medium. The computer-readable medium may include program (instructions) codes, data files, data structures, etc. alone or in combination.

The program (instructions) code recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs, DVDs, Blu-rays, and the like, and ROM, RAM ( A semiconductor memory device specially configured to store and execute program (instruction) code such as RAM), flash memory, and the like may be included.

Here, examples of the program (instruction) code include high-level language codes that can be executed by a computer using an interpreter or the like as well as machine language codes such as those generated by a compiler. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

10: switch
101: current sensor
102: voltage sensor
110: switch body
120: control terminal device
130: main gear

Claims (20)

a switch body 110 installed in a switch 10 connected to a distribution line and generating measurement data by measuring the electric power flowing through the switch 10; and
It includes; a control terminal device 120 for detecting an abnormality in the distribution line by using the measurement data;
The measurement data includes both a voltage detection value (V) and a current detection value (I),
The switch body 110,
a measurement unit 213 for generating the measurement data, wherein the measurement unit 213 includes a current sensor 101 generating the current detection value and a voltage sensor 102 generating the voltage detection value,
The abnormality of the distribution line is made by applying a complex condition of a voltage on level, a voltage off level, a current on level, and a current off level, the voltage on level and the voltage off level are preset, the current on level and The current off level is fixed to the source of the measurement data distribution line abnormality detection system.
delete delete The method of claim 1,
The current sensor 101 is a distribution line abnormality detection system, characterized in that a 1000:1 annular CT (Current Transformer).
The method of claim 1,
_{The control terminal device 120 calculates a three-phase voltage (V 3-PHASE} ) using the voltage detection value and the current detection value, and compares the three-phase voltage (V _3-PHASE ) with a preset reference value. and generating and outputting alarm information on the abnormality according to the comparison result.
The method of claim 1,
The current sensor 101 is installed in any one of the three-phase input terminals of the switchgear 10, and the voltage sensor 102 is installed in the other one of the three-phase input terminals. system.
6. The method of claim 5,
The three-phase voltage (V _3-PHASE ) is the equation

(here, V: voltage detection value indicating the magnitude of the measured voltage transmitted from the switchgear, I: the current detection value indicating the magnitude of the measured current transmitted from the switchgear, v phase off level: the voltage reference value set to determine the voltage loss, i off level: Distribution line abnormality detection system, characterized in that it is defined as a current reference value set to determine the current as loss (0), off time: state detection holding time for generating alarm information, +: AND condition).
8. The method of claim 7,
After the alarm information is generated, if the voltage detection value (V) is greater than the voltage reference value (v phase off level), the alarm information is released.
8. The method of claim 7,
After the alarm information is generated, when the current detection value (I) is greater than the current reference value (i off level), the alarm information is released.
The method of claim 1,
The abnormality is a distribution line abnormality detection system, characterized in that the disconnection and phase loss of the distribution line.
(a) generating measurement data by measuring the electric power flowing through the switch body 110 installed in the switch 10 connected to the distribution line; and
(b) detecting, by the detecting control terminal device 120, an abnormality of the distribution line using the measurement data;
The measurement data includes both a voltage detection value (V) and a current detection value (I),
The switch body 110,
a measurement unit 213 for generating the measurement data, wherein the measurement unit 213 includes a current sensor 101 generating the current detection value and a voltage sensor 102 generating the voltage detection value,
The abnormality of the distribution line is made by applying a complex condition of a voltage on level, a voltage off level, a current on level, and a current off level, the voltage on level and the voltage off level are preset, the current on level and The current off level is a distribution line abnormality detection method, characterized in that fixed to the source of the measurement data.
delete delete 12. The method of claim 11,
The current sensor 101 is a distribution line abnormality detection method, characterized in that a 1000:1 annular CT (Current Transformer).
12. The method of claim 11,
_{The control terminal device 120 calculates a three-phase voltage (V 3-PHASE} ) using the voltage detection value and the current detection value, and compares the three-phase voltage (V _3-PHASE ) with a preset reference value. and generating and outputting alarm information on the abnormality according to the comparison result.
12. The method of claim 11,
The current sensor 101 is installed in any one of the three-phase input terminals of the switchgear 10, and the voltage sensor 102 is installed in the other one of the three-phase input terminals. Way.
16. The method of claim 15,
The three-phase voltage (V _3-PHASE ) is the equation

(here, V: voltage detection value indicating the magnitude of the measured voltage transmitted from the switchgear, I: the current detection value indicating the magnitude of the measured current transmitted from the switchgear, v phase off level: the voltage reference value set to determine the voltage loss, i off level: A distribution line abnormality detection method, characterized in that it is defined as a current reference value set to determine the current as loss (0), off time: state detection holding time for generating alarm information, +: AND condition).
18. The method of claim 17,
After the alarm information is generated, if the voltage detection value V is greater than the voltage reference value (v phase off level), the alarm information is canceled.
18. The method of claim 17,
After the alarm information is generated, if the current detection value (I) is greater than the current reference value (i off level), the alarm information is released.
A computer-readable storage medium storing a program code for executing the distribution line abnormality detection method according to any one of claims 11, 14 to 19.

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