KR20100037375A - Apparatus for measuring earth resistance - Google Patents

Abstract

PURPOSE: By measuring the earth resistance of the ground electrode and transmitting with the remote site the street light earth resistance system for measuring can watch the short circuit and disconnection of the earth resistance line at the remote site. CONSTITUTION: The first communications module(410) is connected based on the flow of the control signal transmitted from the center control part to the street light and signal wire of the shear. The second communications module(440) is connected to the street light and signal wire of backend. It confirms whether data acknowledgement and receiving response transmission unit data received through the first communications module are the steady- state. The answer signal is offered through the first communications module to the street light of the shear.

Description

Street light ground resistance measuring system {Apparatus for measuring earth resistance}

The present invention relates to a grounding resistance measuring system for detecting whether the grounding rod is correctly grounded when the grounding electrode is formed by embedding the grounding rod in the ground. In particular, the grounding of the grounding electrode without using a separate auxiliary grounding rod The present invention relates to a streetlight ground resistance measurement system for accurately measuring resistance and real time real-time ground resistance value in a remote control room and integrating maintenance management accordingly.

In general, when installing electrical facilities such as electrical and electronic equipment, electrical equipment such as transmission towers, the grounding rod is embedded in the ground to form a grounding electrode, and grounding the electrical facilities on the grounding electrode, safety accidents such as electric shock accidents, facilities This prevents damage, noise, and malfunctions.

The grounding is to ensure the electrical connection of the facility to the ground, and ideally, the grounding resistance of the grounding electrode should be 0 ?.

However, the ground is composed of soil particles, water and air, and the ground rod is electrically connected to the ground with a metal, and electrical resistance, that is, ground resistance exists between the ground and the ground rod.

In addition, even when the ground rods of the same size and the same shape are buried in adjacent positions within the same site, their ground resistance values are different from each other. When the ground rods are embedded to form the ground electrode, the ground resistance is set in advance. It is prescribed to be as follows.

For example, type 1 ground works have a ground resistance of 10 Ω or less, type 2 ground works have a ground resistance of 5 Ω or less, type 3 ground works have a ground resistance of 100 Ω or less, and special type 3 ground works The ground resistance is specified to be 10Ω or less.

As a method of measuring the ground resistance of the ground electrode, the potential drop method is widely used. In the potential drop method, as shown in FIG. 1, a current auxiliary rod 110 and a potential auxiliary rod 120 are embedded in a ground spaced apart from the ground electrode 101 in which the ground rod 100 is embedded on the ground. After the auxiliary electrode 111 and the potential auxiliary electrode 121 are formed, a power source 130 is applied between the ground electrode 101 and the potential auxiliary electrode 121 to allow a current to flow through the earth.

Here, an AC power is applied to the power supply 130 in order to prevent the electrochemical action from occurring while the current flows to the ground. In addition, the frequency of the AC power supply 130 is preferably to use a frequency that is not used by other devices in the vicinity so that it is easy to separate the signal derived from the power system, but inductance or capacitance of the lead wire when the frequency is too high This causes the interference to accurately measure the ground resistance, so the AC power supply 130 having a frequency of about 1 kHz or less is used.

The voltage difference is measured by connecting the voltmeter 140 to the ground electrode 101 and the current auxiliary electrode 111, and the ground resistance value is calculated based on the measured potential difference and the current of the AC power supply 130. That is, assuming that the current of the AC power supply 130 is I (A) and the potential difference measured by the voltmeter 140 is V (V), the value of the ground resistance is V / I (Ω).

The potential drop method is characterized in that the ground resistance of the current auxiliary electrode 111 and the potential auxiliary electrode 121 has no effect on measuring the ground resistance of the ground electrode 101.

That is, since the current auxiliary electrode 111 and the potential auxiliary electrode 121 also embed the current auxiliary rod 110 and the potential auxiliary rod 120 on the ground, there is naturally a ground resistance, but the current auxiliary rod 110 and the potential Since the auxiliary rod 120 is short in length, thin, and is temporarily buried to measure the ground resistance of the ground electrode 101, the ground resistance of the current auxiliary electrode 111 and the potential auxiliary electrode 121 is very high. .

However, the ground resistance of the current auxiliary electrode 111 affects the magnitude of the current flowing to the ground, but even if the current value changes, the potential difference between the ground electrode 101 and the current auxiliary electrode 111 changes in proportion to the current value. Therefore, it does not affect the value of the measured ground resistance. In addition, since the ground resistance of the potential auxiliary electrode 121 is in a circuit for measuring the potential difference, the influence of the ground resistance of the potential auxiliary electrode 121 can be eliminated when using a device in which the current does not flow as much as possible. .

However, measuring the ground resistance by the above-described potential drop method actually measures the ground resistance since the current auxiliary rod 110 and the potential auxiliary rod 120 must be buried separately in addition to the ground electrode 101 for measuring the ground electrode. There was a problem that was very cumbersome and time consuming to do.

In addition, there is a method of measuring ground resistance by using a separate ground ohmmeter, but the use of the ground ohmmeter also requires additionally embedding an auxiliary rod on the ground to form an auxiliary electrode. There was a time-consuming problem.

Moreover, street lamps are lined up at regular intervals along the edge of the road to improve the road environment and surroundings. Since these street lamps are exposed to the road, they are inevitably frequently damaged and sensitive to maintenance. Done.

In addition, when the street lamp does not operate normally, the impact on the surroundings is enormous, and thus the monitoring of the change in the ground resistance is considered to be very important.

However, as mentioned above, the techniques proposed up to now have a problem of recognizing the change of the ground resistance or carrying a ground resistance measuring device through most of the manual work. As the loss and burden of human resources are so great, the practical limitations such as not being able to perform real-time maintenance and reporting all residents or performing all inspections on specific work days have emerged as problems.

An object of the present invention for solving the above-mentioned problems relates to a ground resistance measuring system for detecting whether the ground rod is correctly grounded when the ground electrode is formed by embedding the ground rod in the ground. Without measuring the grounding resistance of the grounding electrode, it is recognized remotely so that the grounding resistance of the current state can be recognized in real time. The present invention provides a streetlight ground resistance measurement system for clearly detecting and recognizing and integrating management of maintenance accordingly.

A characteristic of the street lamp ground resistance measuring system according to the present invention for achieving the above object is, in the control device of the street lamp corresponding to the central control unit connected to each street lamp column, such as a normal audio signal line, separate from the power line An impedance converter which supplies a constant voltage to a power supply and converts a high impedance according to a potential difference generated between the power line and the ground terminal into a low impedance according to the ground resistance of the ground electrode and outputs the low impedance; A differential amplifier which receives a low impedance output voltage signal output from the impedance converter and takes a specific gain and outputs it; An A / D converter which receives the voltage signal output from the differential amplifier and converts the voltage signal into digital data; A memory device for storing correlations between voltage values and ground resistance values in a data table; A first communication module connected to a street lamp and a signal line at the front end based on the flow of the control signal transmitted from the central control unit; A second communication module connected to a rear street light by a signal line; Data confirmation and reception response for confirming whether the data received through the first communication module is in a normal state and providing a response signal notifying that the data is normally received through the first communication module to the street lamp side of the front end. A sending unit; Communication line sensing module for notifying the front end of the street when the abnormality of the communication line connected to the equipment of the rear end by confirming whether or not the data received from the front street lamp is transmitted to the street lamp side of the rear end; And receiving the digital data output from the A / D converter and accessing a corresponding ground resistance value in the data table of the voltage-grounding resistor stored in the memory device, and accessing the corresponding ground resistance value through the communication circuit sensing module. It includes a control unit for sending to the side.

Another characteristic of the street lamp ground resistance measuring system according to the present invention for achieving the above object is a control device for a street lamp corresponding to the central control unit connected to each street lamp, such as a normal audio signal line, separate from the power line An AC oscillator for converting a DC light source, which is a reference power source, into an equipotential AC power source and outputting the same according to an input pulse signal; The equipotential AC power output from the AC oscillator is supplied to the power supply, and when the potential difference of AC AC power generated between the power line and the ground terminal occurs according to the ground resistance of the ground electrode, input the value of the corresponding AC power to DC power. An AC / DC converter converting and outputting the converted signal; An impedance converter which converts the high impedance of the signal output from the AC / DC converter into a low impedance and outputs the low impedance; A differential amplifier which receives a low impedance output voltage signal output from the impedance converter and takes a specific gain and outputs it; An A / D converter which receives the voltage signal output from the differential amplifier and converts the voltage signal into digital data; A memory device for storing correlations between voltage values and ground resistance values in a data table; A first communication module connected to a street lamp and a signal line of the front end based on the flow of the control signal transmitted from the central control unit; A second communication module connected to a rear street light by a signal line; Data confirmation and reception response for confirming whether the data received through the first communication module is in a normal state and providing a response signal notifying that the data is normally received through the first communication module to the street lamp side of the front end. A sending unit; Communication line sensing module for notifying the front end of the street when the abnormality of the communication line connected to the equipment of the rear end by confirming whether or not the data received from the front street lamp is transmitted to the street lamp side of the rear end; And receiving the digital data output from the A / D converter and accessing a corresponding ground resistance value in the data table of the voltage-grounding resistor stored in the memory device, and accessing the corresponding ground resistance value through the communication circuit sensing module. It sends out to the side to include a control unit for controlling the oscillation operation of the AC oscillator.

In another aspect, the present invention provides a control apparatus for a street lamp corresponding to a central control unit which connects a cable such as a normal audio signal line to each street lamp separately from the power line:

The ground resistance wires connected from the control unit 370 are connected in parallel to each street light, so that the ground resistance wires are connected from the control unit 370 to the first street lamp in the closed loop first region S1 and from the control unit 370 to the second line. The range in which the ground resistance line is connected to the street lamp is connected to the closed loop second region S2 and the control unit 370 is set to the closed loop N region Sn in the closed loop agent N region Sn. ) And the ground resistance value between the closed loop N region Sn for the first time, and then sequentially measure the reverse order to detect short-circuit and disconnection range regions of the ground resistance line, and the controller 370 detects the abnormal signal position. After the determination, the remote control unit 400 sends data to the central control unit to notify the short-circuit and the disconnection position of the ground resistance wire, and informs the operator of the short-range ground resistance wire at the central control unit. And it includes a paragraph that allows the state to recover.

Advantageous effects due to the above-described features of the present invention, without using a separate auxiliary ground rod, can accurately measure the ground resistance of the ground electrode and at the same time can recognize the value of the ground resistance of the current state in the remote Recognize and manage maintenance accordingly.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

First, referring to FIG. 2 attached to a technical background applied to the present invention, the attached FIG. 2 is an example for describing a power line system for supplying electricity from an electricity supplier. In the electricity supplier that supplies electric power to facilities that use electricity, such as a transmission tower or a transformer in order to prevent occurrence of safety accidents when supplying single-phase power or three-phase power through the power line 200. A grounding rod 220 is embedded in the vicinity of the installed streetlight 210, and the neutral rod 230 is electrically connected to the grounding rod 220 to extend to a predetermined facility using electricity together with the power line 200. Doing.

At this time, in the case of the street lamp, the power line is not supplied with power along the ground power line as shown in FIG. 2, but is supplied with power buried underground, but is conceptually the same as that shown in FIG. 2. do.

One ground resistance of the street lamp is provided for each street lamp, and a change in the street lamp ground resistance value actually means an abnormal occurrence of the street lamp.

Accordingly, in the present invention, as shown in the accompanying FIG. 3, a cable 4, such as a normal audio signal line, is connected to each street light (typically referred to as '3') separately from a power line.

 At this time, through the cable (4) connected to obtain information about the abnormal state of the street lamp and the change value of the ground resistance at a remote location.

Referring to Figures 4 and 5 attached to the configuration of the streetlight ground resistance measuring system according to the present invention provided in each of the street lamps, Figure 4 is an example of the configuration of the ground resistance measuring apparatus according to the present invention, the power supply unit Impedance converter 320 for supplying a constant voltage to the 310 and converts the high impedance according to the potential difference generated between the power line and the ground terminal to a low impedance according to the ground resistance of the ground electrode and outputs a low impedance, the impedance converter ( The differential amplifier 330 receives the low-impedance output voltage signal output from 320 and takes a specific gain, and outputs the voltage signal output from the differential amplifier 330. D conversion unit 340, a memory element (not shown) that stores the correlation between the voltage value and the ground resistance value as a data table, and the reference numeral 4 It is connected to an adjacent street light through a cable which is output from the remote connection unit 400, and the A / D conversion unit 340 for transmitting the input data to the central control unit (1a) of the remote place through the cable (4) The control unit 350 receives the digital data and accesses the corresponding ground resistance value in the data table of the voltage-grounding resistor stored in the memory device and provides the same to the remote connection unit 400.

The reason for using the impedance converter 320 and the differential amplifier 330 in the above-described configuration is to supply a constant voltage to the power supply unit 310 to determine the potential difference generated between the power line and the ground terminal according to the ground resistance of the ground electrode. When the detection method is applied, the detected voltage value has a high output impedance while the voltage value is weak. Therefore, when the value is directly used, accurate measurement cannot be performed.

Therefore, in order to correctly recognize the measurement device of the latter stage, the output impedance must be lowered through the impedance conversion unit 320 formed of an operational amplifier, and a gain of about 5 to 10 times should be taken.

In addition, the memory device of the configuration is preferably present in the control unit 350, the method of configuring the data table of the "voltage-grounding resistance" is the neutral line 220 and ground line (shown in FIG. Input an arbitrary rated voltage between 200) and use the digitally converted analog DC voltage value output from the ground resistance measuring circuit according to the present invention using an A / D converter.

At this time, the voltage value and the ground resistance value in the data table have a linear relationship.

Briefly referring to the operation of the grounding resistance measuring apparatus according to the present invention configured as described above, any reference power source (DC) having an equipotential is applied between the required power supply terminal and the battery terminal of the power supply device 310 of the power equipment ( It flows through R1 and R2) to generate the voltage difference between both ends.

At this time, the signal according to the generated voltage difference is input to the impedance converter 320 formed of the operational amplifier, the impedance converter 320 converts the high impedance of the input voltage signal to a low impedance and outputs.

The signal output from the impedance converter 320 is amplified by the differential amplifier 330 and the analog value is converted into digital data through the A / D converter 340.

The voltage value composed of digital data output from the A / D converter 340 is provided to the controller 350, and the controller 350 is grounded corresponding to the voltage value currently input from the memory device provided therein. Access the resistance value.

The memory device has a data table according to a linear correspondence between a voltage value and a ground resistance value.

Thereafter, the control unit 350 provides the ground resistance value accessed from the memory device to the central control unit 1a through the remote connection unit 400, and the remote control unit 400 generates abnormalities in the central control unit 1a. In response to the inspection, the corresponding value is transmitted in association with the disconnection between the self and the adjacent street lamp and the ground resistance value transmission request in conjunction with the control unit 350.

5 is an exemplary configuration diagram shown in FIG. 5 to which another embodiment is attached. The AC oscillator 380 converts a direct current lamp, which is a reference power source, into an equipotential alternating current power source according to an input pulse signal, and outputs the same. And, if the potential difference of AC alternating current generated between the power line and the ground terminal according to the ground resistance of the ground electrode of the equipotential AC power output from the AC oscillator 380 is supplied to the power supply 310, the corresponding AC power source AC / DC converter 390 for receiving the value of and converting to DC power and outputting, and the impedance converter for converting the high impedance of the signal output from the AC / DC converter 390 to low impedance to output And a differential amplifier 330 that receives a low impedance output voltage signal output from the impedance converter 320 and obtains a specific gain and outputs the differential gain 330. An A / D converter 340 that receives a voltage signal and converts it into digital data, and outputs the digital signal; a memory device (not shown) that stores a correlation between the voltage value and the ground resistance value as a data table; A remote connection unit 400 connected to an adjacent street light via a cable referred to by reference numeral 4 and transmitting the input data to the central control unit 1a of the remote site through the cable 4, and the A / D conversion unit. Input the digital data output from the 340 and access the corresponding ground resistance value in the data table of the 'voltage-grounding resistor' stored in the memory device and provide it to the remote connection 400 side, the AC oscillator ( The controller 370 controls the oscillation operation of the control unit 380.

Since the description is duplicated with respect to the configuration with the same reference numerals as the configuration shown in FIG. 4, the description thereof will be omitted.

Referring to the operation, AC 40V (125 ㎐) boosted by the AC oscillator 380 flows between the required power supply terminal and the ground terminal of the facility to measure the AC voltage between both ends.

When the measured AC voltage is converted into a DC voltage through the AC / DC converter 390 so as to be recognized by the controller 370, the converted DV voltage may have a high output impedance, so the impedance converter ( The output is converted into a low impedance through 320).

The output of the low impedance is amplified by the differential amplifier 330, and the analog value is converted into digital data through the A / D converter 340, and is output. The voltage value converted into the digital data is read by the controller 370. After that, the voltage value is converted into the ground resistance value based on the voltage-to-resistance value stored in the data table stored in the internal memory device.

At this time, in the embodiment shown in Figures 4 and 5, the measurement allowable range of the ground resistance is 0-99Ω, the construction of the connection system of the central server and each terminal of the remote site to connect by wire through the remote connection 400 For example, disconnection, short-circuit, insulation resistance, ground resistance value, etc. of each box and power facility are monitored and transmitted to the central control unit 1a, and the central control unit 1a provides power when necessary. Power on / off can be controlled.

Referring to Figure 6 attached to the detailed configuration of the remote connection 400 of the configuration of the streetlight ground resistance measuring system according to the present invention having the above configuration, the flow of the control signal transmitted from the central control unit (1a) side Based on the first communication module 410 is connected to the street light and the signal line of the front end, the second communication module 440 is connected to the street light and the signal line of the rear end, and the data received through the first communication module 410 A data confirmation and reception response transmitter 420 for providing a response signal to the streetlight side of the front end through the first communication module 410 to check whether the state is normal and notifying that the data is normally received when the data is normal; When the data received from the front street lamp is transferred to the street lamp side of the rear stage, it checks whether it is normally received from the street lamp of the rear stage, so that the communication line connected with the equipment of the rear stage is abnormal. Birth is configured it as a communication line forensics module 430 to notify the side of the front lamp.

In this case, the first communication module 410 and the second communication module 440 mean a communication line transmission terminal and are divided into a reception (Rx) dedicated connection terminal and a transmission (Tx) dedicated connection terminal.

In FIG. 6, a first receiver 411, a first transmitter 412, a second receiver 442, and a second transmitter 441 are represented.

In addition, the communication line sensing module 430 confirms whether a response signal is received from a street lamp at a rear end through the second receiver 442 in connection with the data response and the reception response transmission operation of the reception response transmission unit 420. When a signal indicating that a normal response signal is not received from the reception response check unit 431 and the reception response check unit 431 is determined, an error has occurred in the ground resistance measurement system connected to the street lamp in the rear stage, and a warning signal is generated. Whether the warning signal exists in the signal generated and received from the rear street lamp through the warning signal generator 433 and the second receiver 442 applying the same to the first transmitter 412. If it is determined to be present, it is composed of a warning signal detection unit 432 to apply the signal to the first transmission unit 412 without processing.

At this time, the data confirmation and reception response transmitting unit 420 provides the received data to the control unit in the ground resistance measurement system of the ground resistance measurement system to correspond to the control signal generated from a remote location.

Therefore, real-time closed loops are sequentially formed from the street lamps close to the central control unit 1a, so that inspection of the system and notification of inspection results are made.

In addition, according to the present invention, a closed loop is formed in multiple stages as shown in FIG. You can check whether there is a short circuit.

In this configuration, in the control unit of the street lamp corresponding to the central control unit connecting a cable such as a normal audio signal line to each street light separately from the power line, the ground resistance line connected from the control unit 370 is connected in parallel to each street light The closed loop first area S1 and the range where the ground resistance line is connected from the control unit 370 to the second street lamp are connected to the closed loop second area. S2), the range in which the ground resistance line is connected from the controller 370 to the N-th street light is set to the closed loop N area Sn, and the ground resistance value between the control part 370 and the closed loop N area Sn. After the first measurement, and then sequentially measured in reverse order to detect the short-circuit, disconnection range region of the ground resistance line, and determine the position of the signal more than that in the control unit 370, and then the data through the remote connection 400 It sends out to the control part, notifies the short-circuit and disconnection position of the ground resistance wire, and informs the worker who is working at a short distance from the central control part so as to recover the disconnection and short-circuit state of the ground resistance wire.

For example, as shown in FIG. 7, the closed loop first region S1, the closed loop second region S2, and the closed loop third region S3 .. the closed loop n region Sn. 370 is set as a closed loop area, respectively.

As shown in the drawing, the closed loop first region S1 refers to a ground resistance line region of a first street lamp, which is first formed from the controller 370, and the closed loop second region S2 is a control unit 370. Means the area between the ground resistance wires of the second street lamps from the second.

In addition, the closed-loop n-th region Sn refers to a ground resistance line region such as the last n-th street in the entire region from the controller 370. The Peruvian n-th region is the whole to be measured from the controller 370. It will cover all areas.

Of course, such an entire area means an array area of street lamps extending in one direction from the control unit 370, and does not mean an array area of other street lamps extending in another direction. It covers the area of the streetlight array arranged in one direction.

In addition, the measurement of the ground resistance value for the array area of the street light that is arranged in a long direction in the other direction can also be measured by the same method and procedure, and the effective range for detecting the disconnection and short circuit areas can be easily detected by detecting the disconnection and short circuit. It can be detected.

That is, for each region set as described above, the ground resistances GR 1 to n grounded to the ground by the arbitrary resistors R 1 to n connected to the street lamps are configured, and then the respective regions are controlled by the controller 370. The ground resistance value can be measured by parallel connection.

For example, at first, the controller 370 measures the ground resistance value between the closed loop n regions Sn connected to the last street lamp within the range of the entire closed loop region, thereby checking whether there is an abnormality. If there is a disconnection or short-circuit of the ground resistance line over any one of the range within the range, the ground resistance value detected by the control unit 370 will appear as several tens of MΩ, and there will be no problem with the ground resistance line within the entire range. In the absence of, the appropriate ground resistance is indicated.

Here, when the ground constant value between the closed loop area n, the closed loop n area Sn, which is the ground resistance line of the final street light, is normal from the entire closed loop area, that is, the entire measurement target area is the normal range, You will not need to measure the ground resistance.

However, when an abnormality is found within the entire closed loop area range, the ground resistance value is sequentially measured for each closed loop area, and the disconnection and short circuit positions can be narrowed and discriminated.

Therefore, when the short-circuit or disconnection position of the ground resistance wire is detected by such a procedure, the control unit 370 determines the position of the abnormal signal and sends the data to the remote connection unit 400 so that the worker can work at a short distance. By notifying the controller, control is made to recover the disconnection and short-circuit of the ground resistance wire.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone with it will know easily.

1 is an exemplary view for explaining the concept of the potential drop method for measuring ground resistance

2 is an exemplary diagram for describing a technical background applied to the present invention.

3 is a conceptual diagram of a streetlight ground resistance measuring system according to the present invention

4 and 5 are examples of the configuration for measuring the ground resistance of the configuration of the streetlight ground resistance measuring system according to the present invention

6 is an exemplary configuration for signal connection with a central control unit existing in a remote location of the configuration of the streetlight ground resistance measurement system according to the present invention;

7 is a schematic configuration diagram for detecting the presence or absence of a short circuit and a short circuit position of a ground resistance line using the present invention;

Brief description of the main symbols in the drawings

100; Ground rod 101; Earth electrode

110; Current auxiliary rod 111; Current auxiliary electrode

120; Potential auxiliary rod 121; Potential auxiliary electrode

130; Power supply 140; Voltmeter

200; Powerline 210; Street lamp

220; Ground rod 310; Power supply

320; An impedance converter 330; Differential amplifier

340; A / D conversion unit 350, 370; Control

380; AC oscillator 390; AC / DC converter

400; Remote connection 410; First communication module

411; A first receiver 412; First transmitter

420; Reception response transmitter 431; Reception response confirmation unit

432; A warning signal detector 433; Warning signal generator

441; Second transmitter 442; 2nd receiver

Claims (3)

In the control device of a street lamp corresponding to the central control unit which connects a cable such as a normal audio signal line to each street light separately from the power line: An impedance converter which supplies a constant voltage to the power supply and converts a high impedance according to a potential difference generated between the power line and the ground terminal into a low impedance according to the ground resistance of the ground electrode and outputs the low impedance; A differential amplifier which receives a low impedance output voltage signal output from the impedance converter and takes a specific gain and outputs it; An A / D converter which receives the voltage signal output from the differential amplifier and converts the voltage signal into digital data; A memory device for storing correlations between voltage values and ground resistance values in a data table; A first communication module connected to a street lamp and a signal line of the front end based on the flow of the control signal transmitted from the central control unit; A second communication module connected to a rear street light by a signal line; Data confirmation and reception response for confirming whether the data received through the first communication module is in a normal state and providing a response signal notifying that the data is normally received through the first communication module to the street lamp side of the front end. A sending unit; Communication line sensing module for notifying the front end of the street when the abnormality of the communication line connected to the equipment of the rear end by confirming whether or not the data received from the front street lamp is transmitted to the street lamp side of the rear end; And Receives the digital data output from the A / D converter and accesses the corresponding ground resistance value in the data table of the voltage-grounding resistor stored in the memory device to the central control unit through the communication line sensing module. Street light resistance measurement system comprising a control unit for transmitting. In the control device of a street lamp corresponding to the central control unit which connects a cable such as a normal audio signal line to each street light separately from the power line: An AC oscillator for converting a direct current lamp, which is a reference power source, into an equipotential alternating current power source and outputting the same according to an input pulse signal; The equipotential AC power output from the AC oscillator is supplied to the power supply, and when the potential difference of AC AC power generated between the power line and the ground terminal occurs according to the ground resistance of the ground electrode, input the value of the corresponding AC power to DC power. An AC / DC converter converting and outputting the converted signal; An impedance converter which converts the high impedance of the signal output from the AC / DC converter into a low impedance and outputs the low impedance; A differential amplifier which receives a low impedance output voltage signal output from the impedance converter and takes a specific gain and outputs it; An A / D converter which receives the voltage signal output from the differential amplifier and converts the voltage signal into digital data and outputs the digital data; A memory device for storing correlations between voltage values and ground resistance values in a data table; A first communication module connected to a street lamp and a signal line of the front end based on the flow of the control signal transmitted from the central control unit; A second communication module connected to a rear street light by a signal line; Data confirmation and reception response for confirming whether the data received through the first communication module is in a normal state and providing a response signal notifying that the data is normally received through the first communication module to the street lamp side of the front end. A sending unit; Communication line sensing module for notifying the front end of the street when the abnormality of the communication line connected to the equipment of the rear end by confirming whether or not the data received from the front street lamp is transmitted to the street lamp side of the rear end; And Receives the digital data output from the A / D converter and accesses the corresponding ground resistance value in the data table of the voltage-grounding resistor stored in the memory device to the central control unit through the communication line sensing module. Street light resistance measurement system comprising a control unit for transmitting and controlling the oscillation operation of the AC oscillator. In the control device of a street lamp corresponding to the central control unit which connects a cable such as a normal audio signal line to each street light separately from the power line: The ground resistance wires connected from the control unit 370 are connected in parallel to each street light, so that the ground resistance wires are connected from the control unit 370 to the first street lamp in the closed loop first region S1 and from the control unit 370 to the second line. The range in which the ground resistance line is connected to the street lamp is connected to the closed loop second region S2 and the control unit 370 is set to the closed loop N region Sn in the closed loop agent N region Sn. ) And the ground resistance value between the closed loop N region Sn for the first time, and then sequentially measure the reverse order to detect short-circuit and disconnection range regions of the ground resistance line, and the controller 370 detects the abnormal signal position. After the determination, the remote control unit 400 sends data to the central control unit to notify the short-circuit and the disconnection position of the ground resistance wire, and informs the operator of the short-range ground resistance wire at the central control unit. And streetlight earth resistance measurement system, characterized in that to make the short-circuit state can be recovered.

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