KR101071942B1 - Leakage current monitoring system for voltage distribution line based on AMR network and driving method thereof - Google Patents

Abstract

Power meter leakage current monitoring system based on the remote meter reading network that can monitor and manage the leakage current occurrence of the secondary power line section of the transformer through the low voltage remote meter network using the power line communication (PLC) network do. The power line leakage current monitoring system collects the leakage current values sensed from the leakage current detection sensor and the leakage current detection sensor installed in the power line between the transformer and one or more consumers, and converts the collected leakage current values into leakage current data. It includes a remote monitoring server for determining the quality of the power line using the leakage current data transmitted from the data concentrator and the data concentrator through the communication network, and generates various events according to the determination result.

Leakage Current, Remote Meter Only, Low Voltage Power Line

Description

Leakage current monitoring system for voltage distribution line based on AMR network and driving method

The present embodiment relates to a leakage current monitoring system, and more particularly, based on a remote meter reading network using a remote metering network to monitor leakage current of a low voltage power line section from a transformer secondary side to a low voltage power supply premises including a home. The present invention relates to a power line leakage current monitoring system and a method of operating the same.

Electricity supplied to each household (consumer) through Jeonju (telephone) is supplied to the main breaker, earth leakage breaker and section breaker in the premises. Accordingly, when a certain leakage current is generated in each home, the ground fault breaker operates to stop the power supply. At this time, if the abnormal fault of each home is eliminated and the earth leakage breaker is operated, the normal power supply is resumed.

On the other hand, the electric power meter from the secondary side of the transformer of the pole is usually composed of a lead wire composed of a DV cable or a low voltage power cable. In addition, fuses used as lead wire protection devices in electric poles are protected only when over current of 38 ~ 100A.

Conventionally, current leakage of lead wires is not detected unless it is in an accident level such as lead wire shortage, and dangerous situations such as occurrence of live parts due to friction of lead wires and conductive objects due to deterioration of insulation of the lead wires, wind and rain cannot be predicted. .

That is, conventionally, a method of detecting current leakage by using a difference between a meter reading amount of electric power provided from a pole and a usage amount of each household is used, but such a current leakage detection method does not consider current leakage of a lead wire itself. It could not be used as a tool to judge and manage the health of electrical installations.

The problem to be solved by the present invention is to provide a power line leakage current monitoring system that can monitor the leakage current of the power supply line (lead wire) for providing power to each home.

Another object of the present invention is to provide a method of operating a power line leakage current monitoring system.

Power line leakage current monitoring system according to an embodiment of the present invention for solving the above problems, the leakage current sensing sensor installed in the power line between the transformer and one or more consumers, leakage current sensor sensed from the leakage current collection Determine the quality of the power line by using the leakage current data transmitted through the communication network from the data concentrator and the data concentrator that converts the collected leakage current value into the leakage current data, and generate various events according to the determination result. Include a remote monitoring server.

The leakage current sensor outputs the leakage current value from the difference between the voltage signal supplied in the customer direction and the voltage signal returned from the customer.

The data concentrator generates the leakage current data by analog-to-digital converting the leakage current value.

The data concentrator sends the leakage current data to the remote monitoring server using power line communication.

The transformer converts the high voltage signal provided from the high voltage line of the pole into a low voltage signal and outputs the low voltage signal. The power line is a low voltage power line for supplying the low voltage signal output from the transformer to the at least one customer.

The remote monitoring server may include: a storage unit storing a leakage current average value, a rating determination unit comparing the transmitted leakage current data and the leakage current average value, and determining a quality of the power line according to a comparison result, and the rating determination unit. And an event processor for generating an event according to the determination result.

The rating determiner generates a plurality of sections by applying a predetermined deviation value to the average leakage current value, and extracts one section corresponding to the leakage current data from the plurality of sections to determine the quality of the power line. .

According to another aspect of the present invention, there is provided a method of operating a power line leakage current monitoring system, the method including sensing a leakage current value from a power line, and converting the sensed leakage current value into leakage current data. And comparing the stored leakage current average value with the leakage current data to determine the quality of the power line and generating an event according to the determination result.

The sensing of the leakage current value may include sensing a difference between a supply current supplied from the power line in a customer direction and a return current returned from the customer.

The determining of the quality of the power line may include generating a plurality of sections by applying a predetermined deviation value to the average leakage current value and extracting one section corresponding to the leakage current data from the plurality of sections. Determining the quality of the power line.

The generating of the event according to the determination result may include generating an alarm or a notification event according to the quality determination result of the power line.

According to the remote meter reading network-based power line leakage current monitoring system and its operation method according to the present invention, the conventional line quality control of the power line section was only a fuse operation to cut off when an overcurrent occurs in the pole, the present invention is a leakage current of the power line By measuring in real time and using this to manage the quality of the power line, it is possible to prevent accidents such as power failure of the customer due to the relatively poor management of the power line. In addition, the present invention is possible to monitor the leakage current for the entire power line and the customer section, it is possible to manage / monitor the electrical equipment in the customer.

This has the effect of reducing the manpower and budget consumed for power line maintenance / maintenance / management.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the embodiments of the present invention, reference should be made to the accompanying drawings that illustrate embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a schematic configuration diagram of a power line leakage current monitoring system according to an exemplary embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a remote monitoring server illustrated in FIG. 1.

Referring to FIG. 1, the power line leakage current monitoring system 100 may include a transformer 40 for supplying electricity to each home, for example, the customer 50, and a power line connecting the transformer 40 and the customer 50. 30), the leakage current detection sensor 60 installed on (or attached to) the power line 30, the data concentrator 70 and the data concentrator 70, which communicate with the leakage current detection sensor 60. Remote monitoring server 80 may be included.

The transformer 40 is installed in a pole (or telegraph pole) (not shown), and converts a high voltage signal applied from one or more high voltage lines 10 into a low voltage signal available to each customer 50.

For example, at least one high voltage line 10 and the neutral line 20 are disposed on the pole, and the transformer 40 may connect one high voltage line 10 and the neutral line 20.

The neutral line 20 is a line connected between the neutral points when the transformer 40 is Y-connected in a single-phase three-wire system or a three-phase alternating current system.

The neutral line 20 may be coupled to the power line 30 connected to the secondary side of the transformer 40, for example, the output side, and the current may always return through the neutral line 20.

The transformer 40 converts a high voltage signal applied from the high voltage line 10, for example, a high voltage signal having a magnitude of about 22.9 KV, into a low voltage signal, such as a low voltage signal having a magnitude of about 220 V or 380 V, and converts the converted low voltage signal. It can output to each customer 50 through the power supply line 30 connected to the secondary side.

The low voltage power supply line 30, also called a lead wire, may supply a low voltage signal output from the transformer 40 to each customer 50.

Each customer 50 may be used as an electrical signal for driving a plurality of electronic products by using a low voltage signal applied from the transformer 40 through the power supply line 30. The power supply line 30 may be composed of a pair of wires, for example.

The leakage current sensor 60 may be installed on the power line 30 to sense a current leaking from the power line 30, and output a leakage current value LC according to the sensing result.

The leakage current sensor 60 may be installed on the power line 30 at a position spaced apart from the secondary side of the transformer 40 by a predetermined distance, for example, an image current sensor installed surrounding the power line 30. Sensing sensors such as these can be used.

The leakage current sensor 60 may compare the low voltage signal supplied to each consumer 50 through the power supply line 30 and the regression voltage signal returned from each consumer 50 through the power supply line 30. The leakage current value LC may be output by sensing the difference of the signals.

3 is a diagram illustrating various installation examples of the leakage current sensor illustrated in FIG. 1.

1 and 3, the leakage current sensor 60 senses the leakage current of the power line 30 in each customer 50 unit, or supplies the power to the customer group units 50_1 and 50_2 grouped in groups. The leakage current of the line 30 may be sensed.

For example, referring to FIG. 3A, a plurality of consumers 50 adjacent to each other may receive a low voltage signal from a transformer 40 through one power line 30.

In this case, the leakage current sensor 60 may be installed on one power line 30 between the transformer 40 and the plurality of consumers 50, and senses a leakage current leaking from one power line 30. The leakage current value LC can be output.

In addition, referring to FIG. 3B, the plurality of consumers 50 may be grouped in groups, respectively, from the transformer 40 through one power line 30 and a branched power line 30. The low voltage signal can be supplied.

For example, the plurality of consumers 50 may be grouped into the first group 50_1 and the second group 50_2. The customer of the first group 50_1 is supplied with a low voltage signal through one power line 30, and the customer of the second group 50_2 is connected to a power line 31 branched from one power line 30. The low voltage signal can be supplied.

In this case, the leakage current sensor 60 may be installed on one power line 30, that is, one power line 30 between the transformer 40 and the branched power line 30, and one power line. The leakage current leaking from 30 may be sensed to output the leakage current value LC.

In addition, referring to FIG. 3C, the plurality of consumers 50 supply a low voltage signal from the transformer 40 through one power line 30 and a plurality of power lines 33 and 35 connected thereto. I can receive it.

For example, one power line 30 primarily connected to the transformer 40 may be connected to each of the plurality of power lines 33 and 35 through a plurality of poles (not shown), and from the transformer 40. The low voltage signal supplied may be transmitted to the plurality of power lines 33 and 35.

In this case, the leakage current sensor 60 may be installed on one of the plurality of power lines 33 and 35 connected to one power line 30, and leaks from the plurality of power lines 33 and 35. The leakage current value LC may be output by sensing the current.

The leakage current value LC sensed and output from the leakage current sensor 60 may be transmitted to the data concentrator 70 through a communication network, for example, a wired / wireless first communication network 91.

Referring back to FIG. 1, the data concentrator 70 may receive the leakage current value LC from the leakage current sensor 60, convert it into a digital signal, and store the converted digital signal.

For example, the data concentrator 70 may analog-digital convert the leakage current value LC, which is an analog signal, and store a digital signal, that is, leakage current data LCD, generated according to the conversion result. The leakage current data LCD may be a binary digital signal.

In addition, the data concentrator 70 may transmit the stored leakage current data LCD through the second communication network 95 according to a data transmission request from the remote monitoring server 80 to be described later.

The second communication network 95 may be a communication network using a wired / wireless transmission protocol. As an example, in the present embodiment, the data concentrator 70 uses the power line communication (PLC) network to display the leakage current data (LCD). ) May be transmitted to the remote monitoring server 80.

The data concentrator 70 may be disposed in the same pole as the transformer 40 described above, and in some cases, may be installed in another pole adjacent to the pole installed with the transformer 40.

The remote monitoring server 80 determines the quality of the power line 30 from the leakage current data (LCD) transmitted from the data concentrator 70, and accordingly generates an alarm or notifies the operator (or administrator) of this. You can perform the event.

1 and 2, the remote monitoring server 80 may include an average value storage unit 81, a grade determination unit 83, a grade storage unit 87, and an event processing unit 85.

The average value storage section 81 has a leakage current based on an average value of a plurality of leakage current data LCDs transmitted from the data concentrator 70 for a certain period of time, for example, months, that is, leakage current history data for a certain period of time. The average value LCD 'can be stored.

In some cases, the average value storage unit 81 may store the leakage current data LCD transmitted from the data concentrator 70 to calculate a new leakage current average value LCD ′.

The rating determiner 83 compares the leakage current data LCD transmitted from the data concentrator 70 and the leakage current average value LCD ′ provided from the average value storage unit 81, and according to the comparison result, the power supply line 30. ) Can determine the quality. The rating determiner 83 may output the determination result DS.

The grade storage unit 87 may store the determination result DS output from the grade determination unit 83.

The event processing unit 85 processes an event control signal CNT for processing various events such as an alarm occurrence, a text message or an e-mail notification to an administrator, etc. according to the determination result DS output from the rating determination unit 83. ) Can be printed.

The event processor 85 may control operations of external devices such as an alarm generating device or an external server that may notify a text message or an e-mail using the event control signal CNT.

4 is an operation flowchart of the power line leakage current monitoring system shown in FIG. 1, and FIG. 5 is an operation flowchart of the remote monitoring server shown in FIG. 1.

1, 2, and 4, the power line leakage current monitoring system 100 uses a leakage current sensor 60 installed in the power line 30 to detect a leakage current leaked from the power line 30. It may sense (S10).

The sensed leakage current is output to the data concentrator 70 as a leakage current value LC, and the data concentrator 70 may generate the leakage current data LCD by converting the leakage current value LC ( S20).

The data concentrator 70 transmits the leakage current data LCD generated in response to a request from the remote monitoring server 80 to the remote monitoring server 80 through the second communication network 95, and the remote monitoring server 80. ) May determine the quality of the power supply line 30 from the transmitted leakage current data LCD (S30).

The remote monitoring server 80 may generate various events according to the determination result (S40).

For example, the remote monitoring server 80 may notify the administrator of the determination result to take a predetermined action or generate an alarm so that an immediate action may be taken.

Hereinafter, the operation of the remote monitoring server 80 will be described with reference to FIG. 5. In the present embodiment, for convenience of explanation, the leakage current data X described in FIGS. 1 and 2 will be named X, and the leakage current average value Y will be named Y.

1, 2, and 5, after the remote monitoring server 80 receives the leakage current data X from the data concentrator 70 (S110), the remote monitoring server 80 may compare the leakage current data with the previously stored average value of leakage current. (S120).

The rating determiner 83 of the remote monitoring server 80 may compare the leakage current average value Y stored in the average value storage unit 81 with the leakage current data X transmitted from the data concentrator 70.

For example, the rating determiner 83 generates a plurality of sections by applying a predetermined deviation value to the average leakage current value Y, and selects one section corresponding to the leakage current data X from the generated plurality of sections. By extracting, the comparison operation can be performed.

The grade determining unit 83 may determine the quality of the power line 30 according to the comparison result (S140).

For example, the leakage current average value Y is 10, and the grade determination unit 83 may generate a plurality of sections to which a deviation value is applied from the leakage current average value Y.

Here, the rating determiner 83 may generate the first section by applying the deviation value added by 15% from the leakage current average value Y.

In addition, the rating determiner 83 may generate the second section by applying the deviation value added by 15% and the deviation value added by 30% from the leakage current average value Y, respectively.

In addition, the rating determiner 83 may generate the third section by applying the deviation value added by 30% from the leakage current average value Y.

At this time, if the leakage current data X corresponds to the first section, that is, the first section smaller than the leakage current average value Y added by 15%, the rating determiner 83 may turn off the power line 30. It may be determined that the management target (S140).

Further, if the leakage current data X corresponds to the second section, that is, the data corresponding to the second section that is greater than or equal to the leakage current average value Y added by 15% and smaller than the leakage current average value Y added by 30%, The rating determiner 83 may determine the power line 30 as the surrounding observation target (S140).

In addition, if the leakage current data X corresponds to the third section, that is, the data corresponding to the third section greater than or equal to the leakage current average value Y added by 30%, the rating determination unit 83 disconnects the power line 30. It can be determined as an emergency maintenance target (S140).

The rating determiner 83 may output the above-described various determination results DS, and the event processor 85 may generate various events according to the determination result DS output from the rating determiner 83. (S150).

For example, the event processing unit 85 may generate a notification event for transmitting the determination result DS of the rating determination unit 83 to a manager through a text message or an email.

In this case, the event processor 85 may output an event control signal CNT for a notification event to an external server (not shown) capable of sending a text message or an email.

In addition, the event processing unit 85 may generate an alarm event for generating an alarm according to the determination result DS of the rating determination unit 83.

In this case, the event processor 85 may output an event control signal CNT for an alarm event to the alarm device.

When various events occur by the event processing unit 85, the manager may recognize the event and perform maintenance of the power line 30.

Although the content of the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. will be. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a schematic diagram of a power line leakage current monitoring system according to an exemplary embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the remote monitoring server shown in FIG. 1.

3 is a diagram illustrating various installation examples of the leakage current sensor illustrated in FIG. 1.

4 is an operation flowchart of the power line leakage current monitoring system shown in FIG. 1.

5 is a flowchart illustrating the operation of the remote monitoring server illustrated in FIG. 1.

Claims (11)

A power line leakage current monitoring system based on a remote meter network, A leakage current sensing sensor installed at a power line between the transformer and one or more consumers; A data concentrator configured to collect the leakage current value sensed by the leakage current sensor and convert the collected leakage current value into leakage current data; And And a remote monitoring server that compares the leakage current data transmitted from the data concentrator and the average leakage current value, determines the quality of the power line using the comparison result, and generates various events according to the determination result. Power line leakage current monitoring system. The method according to claim 1, The leakage current sensor, And a power line leakage current monitoring system outputting the leakage current value from a difference between the voltage signal supplied in the customer direction and the voltage signal returned from the customer. The method according to claim 1, And the data concentrator is configured to generate the leakage current data by analog-to-digital converting the leakage current value. The method according to claim 1, And the data concentrator is configured to transmit the leakage current data to the remote monitoring server using power line communication. The method according to claim 1, The transformer converts and outputs a high voltage signal provided from a high voltage line of a pole to a low voltage signal, And the power line is a low voltage power line for supplying the low voltage signal output from the transformer to the at least one customer. The method according to claim 1, The remote monitoring server, A storage unit storing the leakage current average value; A rating determination unit comparing the leakage current data with the average leakage current value and determining a quality of the power line based on a comparison result; And Power line leakage current monitoring system including an event processing unit for generating an event according to the determination result of the rating determination unit. The method according to claim 6, The grade determining unit generates a plurality of sections by applying a predetermined deviation value to the average leakage current value, And extracting one section corresponding to the leakage current data from the plurality of sections to determine whether the power line is a general management object, an ambient observation object, or an emergency maintenance object. A method of operating a power line leakage current monitoring system based on a remote meter network, Sensing a leakage current value from a power line; Converting the sensed leakage current value into leakage current data; Comparing the leakage current data with a pre-stored leakage current average value; Determining a quality of the power line by using the result of comparing the leakage current value and the leakage current data; And Generating an alarm or notification event according to the determination result. The method according to claim 8, Sensing the leakage current value, And operating a supply line leakage current monitoring system for sensing a difference between a supply current supplied from the power supply line and a return current returned from the customer. The method according to claim 8, Determining the quality of the power line, Generating a plurality of sections by applying a predetermined deviation value to the average leakage current value; And Extracting one section corresponding to the leakage current data from the plurality of sections, and determining whether the power line is a general management target, an ambient observation target, or an emergency maintenance target; Method of operation. delete

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