KR20050002945A - Detector and method sensing a electric leakage position by a electric power line communication - Google Patents

Abstract

PURPOSE: A method and an apparatus are provided to prevent a loss of lives caused due to an electric leakage and reduce costs by improving accuracy of detection of electric leakage position. CONSTITUTION: An apparatus comprises a distribution board equipped with a power line communication master modem and an earth leakage breaker; a plurality of power line communication slave modems(12) connected to a power line communication master modem in the distribution board through a power line, and arranged to correspond to the respective street lamps; and a street lamp line leakage monitoring circuit including a first leakage signal sensor unit arranged in a power line led to a lamp pole and a second leakage signal sensor unit arranged in a power line led to a stabilizer(5) mounted in each of street lamps. Each of the power line communication slave modems includes a signal converting unit(31) connected to the first and second leakage signal sensor units; a power line communication unit(32) for maintaining a communication line between the power line communication slave modem and the power line communication master modem; a current sensing unit(36) for sensing the current flowing along the stabilizer mounted in each of street lamps; a signal storing unit(41) for storing algorithms for detecting leakage position; a solid state relay(35) for cutting off power supplied to the street lamps; and a microprocessor(34) for judging conditions of electric leakage in accordance with the signal output from the signal converting unit.

Description

Method and apparatus for checking the leakage point of street light line using power line communication {Detector and method sensing a electric leakage position by a electric power line communication}

The present invention relates to a method and a device for identifying a line leakage point of a street lamp, in particular, the present invention is to monitor the short-circuit state of each street lamp column and the line using a power line communication method without using a separate communication line in the existing street light control system. The present invention relates to a method and an apparatus for identifying a short circuit point of a track and a light pole when a short circuit occurs due to a short circuit or ground fault, and a temporary short circuit due to flooding during rainy weather.

Generally, dozens or hundreds of street lamps around the road are installed to control the power supply at one place. Usually, the street lamp lighting circuit is composed of a choke coil and a ballast with a high voltage pulse generator circuit and a lamp, and a high voltage pulse generator circuit. In this case, the pulse voltage of several KV is generated by the resonance of condenser and choke coil, and it is configured to light the discharge lamp. There was a disadvantage.

In addition, in order to check and repair the abnormality of the street light, since a large number of lamps and stability lamps were loaded on the maintenance vehicle and visited each of the street lamps, a disadvantage of causing traffic jams was caused by the maintenance vehicle.

As an example of a technique for solving such a conventional problem, Korean Utility Model Publication No. 89-3957 is a device for detecting and displaying a failure state of a street lamp circuit. The present invention is disclosed in Korean Patent Application No. 90-1387, and the Korean Patent Publication No. 95-13607 discloses a device for collecting failure information of a lamp circuit.

In the above fault information collecting device, the central control unit is composed of a central control CPU, a display unit, a keyboard, a switch control unit, a communication unit, and the like, and the central control unit controls various functions by a program. In order to communicate with another terminal or computer system using a dedicated line or carrier frequency.

In addition, the central control unit communicates with the fault detection device connected to the lamp circuit to check whether there is a fault and collect the fault information.

However, according to the conventional luminaire failure area concentration display device and failure information collection method as described above, each failure lamp is detected by the unit failure detector, and the corresponding information is sent to the central control processor. In addition to the complexity of the configuration according to the installation of the fault detector in the installation cost was high.

In addition, in the conventional method of checking a ground fault point of a streetlight-related line, a street light manager uses a ground resistance tester at the ground fault point after the ground fault occurs to separate a power line between the lamp poles and the light poles of each street light. By measuring the ground resistance state of the power supply line, it has been discriminated whether or not there is a short circuit. This method has a problem in that a lot of time and separate measurement equipment and personnel must be mobilized from the time point of occurrence of a short circuit to the time point of determining a short circuit and confirming a ground point. In addition, even if it is necessary to use separate measuring equipment and manpower to determine the leakage point, when the insulation breaks down due to the aging of the power line, the short circuit occurs when the power line is flooded due to rainy weather. At that time, it was not recognized as a short circuit and could not identify a short circuit point.

Another method of monitoring the earth leakage is to install a PLC master modem for the street lamp control using PLC (Power Line Communication) in the street lamp distribution panel, and PLC slave that monitors the short circuit, ballast and lamp failure in each lamp pole. (Slave) The modem is installed to determine whether there is a short circuit or a fault.

The leakage and fault information read out from the earth leakage monitoring device in each lamppost may be transmitted to the PLC master modem in the distribution panel through the PLC slave modem to be displayed as a separate display device.

However, when a short circuit occurs, all the power lines are cut off by an earth leakage breaker mounted in the distribution panel, so that the power lines of the PLC slave modem and the short circuit and fault information determination device mounted on each street lamp are also cut off, and also the power supply line which is a communication medium. There was a lot of problems in the method of displaying the leakage current information by the blocking.

1 illustrates an example of a method of checking a current leak state of a conventional street light and identifying a current leak point.

As shown in FIG. 1, when a short circuit occurs in the street light, the power line 7 is disconnected from the power supply line 7 of the street light lamp, which is connected to the ground fault breaker 2 in the distribution panel 1, and then, using the ground resistance meter 6. Identify the point of leakage by measuring individual leakage conditions. In Fig. 1, reference numeral 3 denotes a lamp mounted on each street light, reference numeral 5 denotes a ballast for lighting the lamp 3, and a dotted line means that the connection of the power line is released.

However, the above-described ground fault point checking method has a disadvantage in that all power lines 7 connected to each street lamp column 4 must be separated in order to identify the ground fault point, and that the street light power line 7 must be individually inspected by the administrator. There was a downside.

In addition, the temporary short-circuit state during rainy weather caused by the aging of the street lamp power line has a problem that it is not possible to determine the short-circuit point when the ground fault occurs.

If a temporary short circuit occurs due to flooding during rain, there is a problem that includes a risk of an electric shock accident because the instantaneous leak point is not checked and the ground line is not replaced.

An object of the present invention has been made to solve the problems described above, after the occurrence of a short-circuit street lamp manager can conveniently perform a series of work methods for grasping the short-circuit point, and also when the short-circuit short-circuit due to rainy weather The present invention provides a method and an apparatus for identifying a ground fault line leakage point that can be easily understood.

Another object of the present invention is the installation of additional communication lines and control lines in the existing streetlight system and the power line communication that does not require the use of separate equipment by using a power line communication to the streetlight monitoring / control system due to the occurrence of a short circuit due to the accident of floodlights and flooding during rain The present invention provides a method and apparatus for identifying a street light line leakage point that can identify a temporary line leakage occurrence situation and an earth leakage point.

1 is a block diagram for a conventional method for checking a ground fault line leakage point;

2 is a block diagram showing the overall configuration of a street light line leakage point confirmation device using power line communication according to the present invention;

3 is a block diagram showing an internal configuration of a street lamp lamp according to the present invention shown in FIG.

4 is a diagram showing an algorithm for identifying a line leakage point according to the present invention;

5 is a diagram illustrating an algorithm for identifying a shorting point in a column in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

1: distribution panel 2: earth leakage breaker

3: lamp 4: street lamp

5: ballast 6: ground resistance meter

7: street light power line 8: disconnection

11: PLC master modem 12: PLC slave modem

21: ZCT 1 22: ZCT 2

23: ZCT 1 input signal line 24: ZCT 2 input signal line

31: signal conversion unit 32: PLC communication unit

33: power supply 34: microprocessor

35 electronic relay 36 current sensing unit

41: signal storage unit

In order to achieve the above object, a street light line leakage point confirming device of the present invention is a street light line leakage point confirming device using power line communication, comprising: a distribution panel having a PLC master modem and an earth leakage breaker, and a PLC master modem and a power line in the distribution panel. Connected to and connected to a plurality of PLC slave modems respectively provided in correspondence with a plurality of street lamps, and a first earth leakage signal sensor unit provided at each of the columnar inlet power lines of the plurality of street lamps and a ballast mounted in each of the plurality of street lamps. And a street light line short circuit monitoring circuit including a second ground fault signal sensor unit provided at a power supply line, wherein each of the PLC slave modems includes a signal converter connected to the first and second ground fault signal sensors; PLC communication unit for maintaining a communication line between the modem and the PLC master, each of the horizontal A current detector for detecting a current value flowing in a ballast mounted in a lamp, a signal storage unit for storing an algorithm for identifying an earth leakage point and an algorithm for identifying an earth leakage point in a column, and a power supply for each street light A relay for blocking and a microprocessor for determining the state of the electric leakage in accordance with the signal supplied from the signal conversion unit.

In the apparatus for checking a street light line leakage point according to the present invention, when it is determined that the electrical leak is determined by the microprocessor, the ground fault state signal value is transmitted to the PLC master modem through the PLC communication unit, so that the ground fault breaker turns into a street light. Shut off the power supply.

In the apparatus for identifying a street light line leakage point according to the present invention, the distribution panel is provided with an LCD display indicating a state of a short circuit, and the LCD display device displays a point of the street light which is in a short state and a time of a short circuit.

Further, in order to achieve the above object, in the street light line leakage point check method using the power line communication of the present invention, a switchboard having a PLC master modem and a ground fault breaker, connected to the PLC master modem in the switchboard through a power line, a plurality of A plurality of PLC slave modems respectively corresponding to the street lamps and a first earth leakage signal sensor unit provided at each of the columnar inlet power lines of the plurality of street lamps, and a power line leading to the ballasts mounted in each of the plurality of street lamps. A method for checking a ground fault point using a ground fault point checking device having a second ground fault signal sensor unit, the method comprising: detecting a ground fault state between respective light poles of the plurality of street lights by the first sensor unit; Detecting a short-circuit state in each column of the plurality of street lights with a sensor unit of the first and second And determining the position of the shorted street light by combining the signal detected by the sensor unit and the signal detected by the second sensor unit.

In the apparatus for checking a street light line leakage point according to the present invention, when it is determined that a short circuit is detected in the determining step, the ground state signal value is transmitted to the PLC master modem to cut off the power supplied by the ground fault breaker to the street light. The method further includes a step to be performed.

In addition, the method for identifying a street light line leakage point according to the present invention may further include the step of displaying a point of the street light which is in the state of a short circuit and a time of a short circuit when it is determined that the ground fault is determined in the determination step.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the drawings.

In addition, in drawing, the same code | symbol is attached | subjected to the same code | symbol and the repeated description is abbreviate | omitted.

Figure 2 is a block diagram showing the overall configuration of the street light line leakage point confirmation device using the power line communication in accordance with the present invention, Figure 3 is a block diagram showing the internal configuration of the lamppost according to the present invention shown in Figure 2, 4 is a diagram illustrating an algorithm for identifying a line leakage point according to the present invention, and FIG. 5 is a diagram illustrating an algorithm for identifying a leakage point in a column according to the present invention.

As shown in FIG. 2, the apparatus for identifying a street light line leakage point according to the present invention includes a PLC master modem 11 and a PLC slave modem 12, and a conventional street light control system includes a distribution panel 1 and a street lamp power supply. It consists of a line 7 and a street lamp 4.

The power distribution board 1 is composed of an earth leakage breaker 2 and other electric appliances, and the lamppost 4 is composed of a ballast 5 and a lamp lamp 3 of the street lamp.

In the present invention, the PLC master modem 11 is additionally installed in the existing streetlight distribution board 1 shown in FIG. 1, and the PLC slave modem 12 is installed in the streetlight lamp column 4, and the streetlight power supply line 7 is provided. ) Is configured by installing the ZCT1 (21), ZCT2 (22) which is an earth leakage signal detection sensor.

PLC master modem 11 is configured to include a separate LCD display (not shown), PLC slave modem 12 is configured in connection with ZCT1 (21), ZCT2 (22).

ZCT1 (21) is a sensor for monitoring the short-circuit state of each street lamp. When a short-circuit occurs, all ZCT (1-1) to (1-n) operate up to the point where the short-circuit occurs. The installed ZCT1 21 does not operate.

In addition, the ZCT2 22 monitors a short circuit state in each of the street lamps 4-1 to 4-n, and when the short circuit occurs, the state value of each PLC slave modem 12-1 is monitored. To (12-n).

As shown in FIG. 3, the PLC slave modem 12 is connected to the ground fault signal detecting sensors ZCT1 21 and ZCT2 22 to convert the signal into a digital signal that can be recognized by the PLC slave modem 12. 31), the PLC communication unit 32 for maintaining the communication line between the PLC slave modem 12 and the PLC master 11, the power supply unit 33 for supplying power required for each component of the PLC slave modem 12, electronic A relay (SSR: solid state relay) 35, a microprocessor 34, a current sensing unit 36 for detecting a current value flowing in a ballast mounted in each street light 4, and an algorithm for identifying a line leakage point; It is composed of a signal storage unit 41 for storing an algorithm for identifying the leakage point in the column.

The PLC slave modem 12 is connected to the ZCT1 (21) and ZCT2 (22) to monitor the short circuit condition, and the recognized short circuit signal value can be recognized by the microprocessor (34) through the signal converter (31). The signal is amplified or converted and sent to the microprocessor.

The ground fault signal detected by the ground fault signal detecting sensors ZCT1 (21) and ZCT2 (22) appears as a minute current signal, and the minute current signal may appear temporarily in a short time, and thus the minute leak signal is recognized by the microprocessor 34. In order to do this, the signal converter 31 converts the signal into an amplified signal. The electrical leak signal thus converted allows the microprocessor 34 to more accurately determine the electrical leak.

The state of the earth leakage signal transmitted to the microprocessor 34 may determine the state of the earth leakage and the position of the earth leakage according to the algorithm of FIGS. 4 and 5, and transmit the state of the position to the signal storage unit 41, which is a nonvolatile memory IC. This value is stored in the PLC communication unit 32 when the streetlight manager recalls the state value of each streetlight lamp 4 from the PLC master 11 when the streetlight manager 2 restores the ground fault breaker 2. It is sent to the PLC master 11 through.

The state value of each streetlight lamp 4 sent to the PLC master modem 11 by the above-described procedure is to determine the short-circuit position by the algorithm as shown in Figs. 11) Informs the street lamp manager through a separate LCD display device.

In the algorithm of FIG. 4, when the present invention is installed as shown in FIG. 2, the ground fault signal detecting sensor ZCT1 monitors whether or not a short circuit occurs between the street lamps 4-1 to 4-n. The signal is stored in the signal storage unit 41.

When a short circuit occurs at a specific point, the device of the present invention in each of the street lamps 4-1 to 4-n recognizes a short circuit to the point where the short circuit occurs centering on the distribution board 1. The apparatus of the present invention in the street lamp lamp 4 which is stored in the signal storage unit 41 in -1) to (12-n) and has passed the earth leakage point centering on the distribution panel 1 is stored as a steady state value.

When a short circuit occurs in the street lamp column 4 or the street lamp line 7, the ground fault breaker 2 in the distribution panel 1 operates within 0.03 seconds to cut off the power line 7 of each street lamp column 4.

The ground fault circuit breaker 2 operated by the ground fault remains blocked until the street light manager returns. When the ground fault manager 2 returns the ground fault breaker 2 to normal, the PLC slave modem 12 in the street lamp column 4 ) Sends the state value just before the power is cut off to the PLC master modem 11 via the PLC communication unit 32.

The status values of each of the street lamps 4-1 to 4-n sent to the PLC master modem 11 are informed to the street lamp manager through the LCD display device, not shown, by the leakage point checking method of FIGS. 4 and 5. Given.

5 is shown in parallel with FIG. 4, and when information is generated by the earth leakage signal monitoring sensor ZCT2 22 as shown in FIG. 5 in combination with this information, the PLC master modem 11 appears. And, it will be displayed as a short circuit in the column, and the electronic relay SSR 35 is automatically driven by the microprocessor 34 in the PLC slave modem 12 to cut off the power of the column.

Since the ground fault breaker 2 in the distribution panel 1 is also operated at the same time when the power is cut off, the microprocessor 34 in the lamp pole is connected to the ZCT2 2 when the street light manager returns to the normal state. If it is recognized as a short circuit by turning off the corresponding lamplight to operate so as not to be affected by the short circuit to other streetlights.

In addition, the earth leakage breaker 2 provided in the power distribution board 1 detects and cuts out an earth leakage state within a current of 15 mA or more and 30 mA or less and an operation time of 0.03 seconds. The PLC slave modem 12 maintains the power for a predetermined time so that the leakage information may be stored before the power is turned off.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

As described above, according to the method and apparatus for confirming the leakage point of the street light line using the power line communication of the present invention, it is possible to prevent direct human injury due to the leakage by identifying the exact leakage point, and to accurately identify the occurrence of the leakage point to repair the line The effect of reducing the cost is obtained.

In addition, according to the method and the device for confirming the short-circuit line leakage point using the power line communication of the present invention, it is possible to easily grasp the short-circuit state of each street light in the distance in connection with the power line communication and other communication means, so The effect of minimizing the time that the street lights are off can be minimized.

In addition, according to the method and the device for confirming the short-circuit line leakage point using the power line communication of the present invention, when the short circuit occurs in the street lamp line to determine whether there is a short circuit, the automatic leakage of the short circuit lamp Other lampposts that do not occur can be supplied with normal power.

In addition, according to the method and apparatus for confirming a street light line leakage point using the power line communication of the present invention, when building the street light monitoring / control system, flooding of the power line during the aging of the street lamp power line coating that cannot be inspected by the existing street light leakage point confirmation method It is also possible to solve the problem of determining the temporary leakage point by means of determining whether or not to always or temporarily leakage.

Claims (6)

In the device for confirming the leakage point of the street light line using power line communication, Distribution board with PLC master modem and earth leakage breaker, A plurality of PLC slave modems connected to the PLC master modem in the distribution panel via a power line and provided in correspondence to the plurality of street lights, respectively; Street light line earth leakage monitoring comprising a first earth leakage signal sensor unit provided in each of the plurality of street light inlet power supply line of the plurality of street lights and a second earth leakage signal sensor unit provided in a power line introduced into the ballast mounted in each of the plurality of street lights Including circuits, Each of the PLC slave modems includes a signal converter connected to the first and second ground fault signal sensors, a PLC communication unit for maintaining a communication line between the PLC slave modem and the PLC master, and a ballast mounted in each of the street lamps. A current detector for detecting a current value flowing through the signal, a signal storage unit for storing an algorithm for identifying an earth leakage point and an algorithm for identifying an earth leakage point in a column; a relay for shutting off power supplied to each of the street lights; An apparatus for checking a grounding line leakage point according to claim 1, further comprising a microprocessor configured to determine a state of a ground fault according to a signal supplied from a signal converter. The method of claim 1, If it is determined by the microprocessor that the electric leakage is detected, the electric leakage state signal value is transmitted to the PLC master modem through the PLC communication unit to check the electric leakage breaker point of the street light line, characterized in that to cut off the power supplied to the electric circuit breaker. Device. The method of claim 2, The distribution panel is provided with an LCD display indicating a state of short circuit, The LCD display device is a short-circuit line leakage point identifying device, characterized in that the point of the short-circuited streetlight and the time of the short-circuit is displayed. A method for identifying a street light line leakage point using power line communication, the method comprising: a distribution board having a PLC master modem and an earth leakage breaker, a plurality of PLC slave modems connected to the plurality of street lamps and connected to the PLC master modem in the distribution panel, respectively, through a power line; And a first earth leakage signal sensor unit provided on each of the plurality of lamppost inlet power lines of the plurality of street lights, and a second earth leakage signal sensor unit provided on a power line introduced into a ballast mounted in each of the plurality of street lights. As a method of checking a ground fault point using a verification device, Detecting a short-circuit state between each column of the plurality of street lamps by the first sensor unit; Detecting a short-circuit state in each column of the plurality of street lamps by the second sensor unit; and And determining the position of the shorted street light by combining the signal detected by the first sensor unit and the signal detected by the second sensor unit. The method of claim 4, wherein If it is determined in the step of determining that the short circuit, the current leakage state signal value is transmitted to the PLC master modem further comprises the step of cutting off the power supply to the ground fault circuit breaker characterized in that it further comprises the step of disconnecting the power supply to the street light. Way. The method of claim 5, If it is determined in the determination step that the short-circuit, it characterized in that it further comprises the step of displaying the point of the short-circuit streetlight and the time of the short-circuit on the display device.