KR100795190B1 - Apparatus and method for patrolling medium voltage power distribution line and pin-pointing the degraded component before its failure - Google Patents

Abstract

A system and a method for inspecting a distribution line and detecting defective facilities are provided to inspect the lines by using a high-frequency noise analyzer and to detect the defective facilities by periodically managing and analyzing noise signals of each electric pole. A system(20) for inspecting a distribution line and detecting defective facilities comprises a high-frequency noise monitoring receiver(22) continuously monitoring whether amplitude modulation type radio noise frequency exists in a received high-frequency signal or not, and registering frequency over the set magnitude, in a monitor list; a noise signal comparing and grade judging receiver(25) comparing the magnitudes of the high-frequency signal and a voice signal separated from the noise signal of the set frequency by continuously monitoring the registered frequency and then generating an alarm by classifying the magnitudes according to each grade; and an analyzing and recording device(23) marking information obtained through the receivers, on a topographical map and analyzing and recording the detected result.

Description

Apparatus and Method for patrolling medium voltage power distribution line and pin-pointing the degraded component before its failure}

1 is a field picture of the prior art live check message stage

Figure 2 is a photograph showing the thermal image inspection results of the prior art

Figure 3 is a schematic view showing a processing distribution facility instantaneous method according to the present invention

4a to 4c is a block diagram of a line instantaneous and defective equipment detection system according to the present invention

5 is a waveform diagram of a state before filtering of a voice frequency signal appearing when insulation of a power distribution facility is poor;

FIG. 6 is a photograph showing a state of a suspension insulator having poor insulation; FIG.

7A to 7D are radio frequency spectrums measured based on the distribution pole of FIG. 6.

8 to 11 are radio frequency spectrum and distribution line instantaneous recording screens measured on the basis of troubled distribution poles.

12a to 12d is a flow chart showing a method for detecting instantaneous and defective equipment of the overhead distribution line according to the present invention.

13 is a diagram showing the correlation between high frequency noise frequency and reach distance

14 is a screen output configuration diagram of on-site acquisition information using the instantaneous distribution line and faulty equipment detection system according to the present invention

Explanation of symbols for the main parts of the drawings

11. Distribution line instantaneous vehicle 12. Distribution line supporting device

13. Distribution Substation 14. Distribution Line

15. Location information transmission satellite (GPS) 20. Line instantaneous and defective equipment detection system

21. Receive Antenna 22. High Frequency Noise Frequency Monitoring Receiver

23. Analysis and recording device 24. GPS receiver

25. Noise Signal Comparison and Grading Receiver

31. High frequency signal amplifier 32. Intermediate frequency converter (Mixer)

33. Amplitude Modulation Detector and Bandpass Filter

34. Medium frequency amplifier 35. Demodulator

36. Voice frequency amplifier 37. Voice frequency output device

38. Voice signal output limiter 39. Local oscillator

The present invention relates to the instantaneous and defective equipment detection of the operation of the distribution line in operation, and specifically, the instantaneous and defective equipment detection system for processing the distribution line that can accurately determine the operating state of the equipment on the ground without the dwelling operation in the live state; It is about a method.

Currently, the utility company is conducting a line inspection, passenger group inspection, and thermal imaging inspection to detect defects in distribution facilities.

According to the "Power Distribution Workbook issued by the Korea Electric Power Corporation," the instantaneous service for overhead distribution lines is inspected instantaneously along the distribution lines by foot or by vehicle, and important check items include the possibility of accidents caused by artificial environmental changes around the distribution lines, The equipment is bad.

Particularly, in the spring, instantaneous inspections to prevent power failures caused by bird and tree contact, and during the instantaneous line inspections such as inspection of equipment operation status due to increase of power demand for cooling and rise of atmospheric temperature are carried out. have.

Hereinafter, the instantaneous inspection of the distribution line of the prior art will be described with reference to the accompanying drawings.

FIG. 1 is a photograph showing a scene of a live rider group inspection step of the prior art, and FIG. 2 is a photograph showing a thermal image inspection result of the prior art.

At present, KEPCO's distribution line instantaneous types and periods are inspected instantaneously along the distribution line by walking or vehicle within at least 15 days as shown in Table 1.

Kinds collection Way Survey Item Safety moment Twice a month Walking, vehicle Artificial environment change around track Regular High pressure: 1 or more quarters Low pressure: 1 or more quarters On foot Inspection of overall processing and distribution facilities Special moment Occasional On foot Accident Occurrence Areas Executive Order More than twice a year On foot Vulnerable facilities, concerns about safety accidents

As for the inspection of passengers, the inspector ascends to Jeonju while the distribution line is blackout for the safety of the inspector. However, recently, the electric power supply system is closely inspected for power distribution facilities. Workers are doing the same.

The boarding inspection is carried out at the point covered by the insulation cover which is difficult to check on the ground, near visual inspection and measurement of the voltage sharing of the insulator. The inspection subjects and details are shown in Table 2.

Inspection target Checking list Transformer installation pole Insulator breakage, lead wire damage, live parts contact, bolt nut tightening, insulating oil contamination, oil leakage, overload operation (load measurement) Protective device installation note Switchgear gas pressure, distribution line contact and current measurement, control unit fuse and operation power, bind deviation Load density line Electric pole crack, secure safety distance from building, wire corrosion, connection heat generation An old track Termination material contamination, termination processing damage, cover damage Breakdown bundle track Fault cause investigation

Thermal inspection is a method of inspecting an abnormal state by using an infrared camera to receive infrared signals generated from abnormal heat generation due to poor wire connection or overload operation.

That is, as shown in Figure 2, by receiving an infrared signal due to the heat generated when there is an overload operation of the transformer on the ground, the power equipment is the latest to check that the heat generated in proportion to the current and resistance value flowing Is the way.

Heat generation Q = I * I * R (Q: heat generation, I: current, R: resistance)

In addition, the breakdown of distribution facilities is as follows with reference to the data submitted to the National Assembly by the Korea Electric Power Corporation.

division Foreign contact Equipment degradation Feng Shui Third Party High Ripple Public error Etc Sum '03 249 488 205 216 326 158 1,642 '04 252 481 223 185 285 164 1,590 '05 226 404 238 250 219 150 1,487 3-year average key 242 458 222 217 277 157 1,573 Share(%) 15 29 14 14 18 10 100

From Table 3, it can be seen that the failure caused by equipment degradation accounts for about 30% of the total failure. The deterioration of the equipment cannot be found on the ground walk or vehicle inspection, which is checked by the naked eye.

The thermal inspection can be efficiently detected at low voltage line connections of the wires, overheating transformers, etc., but the degradation of equipment used in the high voltage line (22.9 kV) cannot be detected.

Corona discharge (partial discharge) current due to insulation deterioration does not generate heat because a small amount of current of several microamps flows instantaneously. In some cases, it is difficult for a thermal imaging camera to detect an infrared signal emitted by being covered by the insulation cover.

In particular, the breakdown of a high voltage cable causes the mechanical strength of the wire to decrease due to the partial discharge between the wire and the support due to corrosion or poor insulation of the wire, and there is no early detection method for the internal cracking of the insulator and the bolt loosening. .

As a result, electric utilities are conducting live-line inspections, and it requires a huge budget to implement them on all distribution lines.

According to the electricity statistics information, the total number of electric poles of KEPCO in 2005 is about 7.2 million, and if it is estimated to be 100,000 won per one week, the cost of checking the whole electric pole is over 700 billion won.

This inspection method using high-frequency noise on the ground, rather than the check of live boarding, such as U.S. Patent No. 5,657,244 (registered on Aug. 1997) of Radar Engineers and Model # 242 AM-UHF RFI Locator user manual In this case, in the case of not knowing the high frequency noise frequency band generated in the distribution pole, it should be monitored and compared by alternating the preset frequency.

Therefore, a technician with advanced technology to analyze the waveform should conduct the line instantaneous with the equipment, continuously measure and monitor the signal at one fixed frequency during the instantaneous transition, and then switch to another frequency when the signal is detected. By checking whether it is captured and analyzing the waveform, it is judged as a pole installed with a bad facility.It can pass a bad pole because of manpower operation and frequency mismatch.It is troublesome to manage data such as high frequency noise signal size and measurement date and time by installation site. There is a feeling.

The present invention is to solve the problems of the instantaneous distribution line and faulty equipment detection method of the prior art, and the instantaneous distribution line to ensure that the operating state of the equipment on the ground can be accurately judged in the live state It is an object of the present invention to provide a failure detection system and method.

The present invention is to solve the problems in the conventional distribution line instantaneous detection and detection method, the line is instantaneous using a high-frequency noise analysis device designed for the detection of equipment failure of the distribution line owned by the power company, the noise signal for each pole It aims to provide an efficient and economical method for detecting and repairing fault facilities by periodically managing and analyzing them.

In order to achieve the above object, the instantaneous distribution line and faulty equipment detection system according to the present invention analyzes the high frequency noise generated by the power distribution equipment and detects a defective location. A high-frequency noise frequency monitoring receiver for continuously monitoring whether or not a frequency equal to or greater than a set size is registered in a monitoring target list; continuously monitoring the registered monitoring target frequency to determine a magnitude of a high frequency signal and a voice signal from which a noise signal of a set frequency is removed. And a noise signal comparison and rating receiver configured to compare and classify the signals by class and generate an alarm; an analysis and recording device for displaying the information acquired through the receivers on a topographic map, and analyzing and recording a detection result. do.

Process distribution line instantaneous and defective equipment detection system according to the present invention for achieving another object is a receiving antenna which is mounted in the instantaneous vehicle to receive radio frequency radiated from the distribution line equipment to detect the defective location of the distribution equipment; A high frequency noise monitoring receiver for continuously monitoring the presence or absence of the amplitude modulation type wireless noise frequency of the high frequency signal and including a frequency of a predetermined size or more in the target list; High frequency signal and the noise of the set frequency by continuously monitoring the monitored target frequency Noise signal comparison and class determination receiver that compares the magnitude of the voice signal from which the signal is removed and classifies it, and generates a warning at a place where there is a possibility of danger; distribution information management system of distribution equipment location information of instantaneous noise measurement of distribution line ( Instantaneous receipt from NDIS) GPS navigation system for setting a road and guiding a vehicle driving route, and recording and displaying information on a measurement time, an instantaneous vehicle's moving speed, and a driving direction for each facility location; displaying information obtained through the receivers on a topographic map It is equipped with a program that can grasp the risk of each grade thereof, and an analysis and recording device for analyzing and recording the detection results.

The instantaneous and faulty equipment detection method of the overhead distribution line according to the present invention for achieving another object comprises the steps of scanning the received frequency for high-frequency noise analysis in order to analyze the high-frequency noise generated in the power distribution equipment to detect defective places ; Processing power frequency noise of a frequency registered in the scanning step; comparing the high frequency noise electric field strength and the voice signal after noise processing; displaying a high frequency noise class according to the comparison result and according to a high frequency noise analysis result And alarm processing, wherein these processing steps are performed during the movement of the instantaneous vehicle equipped with the system.

Hereinafter, the preferred embodiment of the instantaneous and defective equipment detection system and method of the overhead distribution line according to the present invention will be described in detail.

Features and advantages of the overhead and instantaneous equipment detection system and method for overhead distribution line according to the present invention will become apparent from the detailed description of each embodiment below.

Figure 3 is a block diagram showing a process instantaneous distribution equipment instantaneous method according to the present invention, Figures 4a to 4c is a block diagram of a line instantaneous and defective equipment detection system according to the present invention.

FIG. 5 is a waveform diagram of a state before filtering of a voice frequency signal that appears when insulation of a power distribution facility is poor.

The present invention is to guide the distribution line planned for work by using the distribution lines scattered throughout the country, and accordingly monitor the high frequency noise of the unknown frequency emitted from the defective equipment using the vehicle, and the radio noise signal and demodulation of the monitored frequency Radio frequency noise level is determined by comparing the magnitude of the voice signal passing through 60Hz power noise filter, and the audible alarm signal is generated at the spot where the electric pole is installed and the audible alarm signal can be identified by the line spectator. Device.

In addition, the information obtained from the noise analysis device is displayed on the topographic map and the risk of each grade can be identified.

In addition, the apparatus for analyzing radio frequency noise may be configured as a plurality of radio receivers in accordance with the vehicle driving speed and the electric pole installation density.

In an embodiment according to the present invention, two units are used to continuously monitor whether a radio noise frequency in the form of amplitude modulation is present among the high frequency signals received from the antenna continuously, and include a frequency of a predetermined size or more in the monitoring target list.

The other radio receiver continuously monitors the frequency to be monitored, compares the magnitude of the high frequency signal with the 60Hz noise signal, and classifies it into classes and generates an alarm at a place where there is a risk.

Using such a wireless receiver, the scattered radio frequency noise signal for each distribution pole is continuously measured and compared and managed for each measurement.

In the instantaneous process of the distribution distribution facility according to the present invention, while moving along the distribution line 14 for supplying power through the distribution substation 13, as shown in FIG. A device for analyzing the high frequency noise generated by the facility and a satellite navigation device (GPS) for receiving signals from the position information transmission satellite (GPS) 15 are installed to simultaneously record the location and measurement time of the equipment to be measured for corona noise. And a distribution line instantaneous vehicle 11 having a management system capable of displaying it.

According to the present invention as described above it is possible to accurately determine the operating state of the equipment on the ground without the dwelling operation in the live state.

The detailed configuration of the instantaneous and faulty equipment detection system of the overhead distribution line according to the present invention mounted on the instantaneous vehicle is as shown in FIGS. 4A to 4C.

Figure 4a is an overall configuration diagram of the instantaneous and defective equipment detection system of the overhead distribution line according to the present invention, Figure 4b is a detailed configuration diagram of the receiver for monitoring the high frequency noise frequency, Figure 4c is a detail of the noise signal comparison and rating receiver It is a block diagram.

If a minute electric current flow occurs due to poor insulation, poor connection, or loosening of bolts, the magnetic field will be generated between the two filled gaps, which will generate a high frequency signal (voltage). It is conducted over power lines or radiated into free space.

This energy [Radio Frequency Interference] appears throughout the entire band from LF (Low Frequency) to Ultra-High Frequency (UHF) band and is generated according to the environment (temperature, humidity) and the magnitude of the current. The magnitude and shape of the frequency and waveform vary.

As a result, it is difficult to find impulsive high frequency noise generated in an unknown frequency band due to a poor power equipment, but according to the present invention, a general person, not an experienced maintenance worker, regularly runs along the track to acquire data. Continuous management and analysis of relevant records helped prepare for and prevent major rail failures before they occur.

The overall configuration of the overhead and instantaneous facility detection system 20 according to the present invention is as shown in Figure 4a, the receiving antenna 21 for receiving the radio frequency radiated from the distribution line equipment, and the amplitude modulation of the received high frequency signal A high frequency noise monitoring receiver 22 continuously monitoring the presence or absence of a wireless noise frequency of a type and including a frequency of a set size or more in a list to be monitored, a high frequency signal by continuously monitoring the monitored frequency, and a noise signal of a set frequency Compares the magnitudes of the audio signals from which the signals are removed, and classifies them according to the class, and compares the noise signal for generating an alarm and determines the rating signal receiver 25 for generating an alarm and the distribution equipment position information of the instantaneous noise measurement target for the distribution line. Receives from the NDIS, sets its instant route and guides the vehicle , GPS navigation device for recording and displaying the information of the measurement time, the instantaneous vehicle moving speed, the direction of travel of the facility location, that is, the GPS receiver 24, and the information obtained through the receivers on the topographic map and by grade It is equipped with an analysis and recording device 23 for mounting a program capable of identifying a risk and analyzing and recording the detection result.

And the high frequency noise frequency monitoring receiver 22, as shown in Figure 4b, a high frequency signal amplifier 31, a medium frequency converter (Mixer) 32 for changing the frequency of the received high frequency signal, amplitude modulation detector and bandpass filter ( 33), an intermediate frequency amplifier 34, a demodulator 35, an audio frequency amplifier 36, an audio frequency output device (speaker) 37, and a local oscillator 39, and the amplitude modulation of the received high frequency signal It continuously monitors the existence of the form of wireless noise frequency and includes the frequency over the set size in the list.

And the noise signal comparison and rating receiver 25, as shown in Figure 4c, a high frequency signal amplifier 31, a medium frequency converter (Mixer) 32 for changing the frequency of the received high frequency signal, amplitude modulation detector and bandpass filter (33), an intermediate frequency amplifier 34, a demodulator 35, an audio frequency amplifier 36, an audio frequency output device (speaker) 37, an audio signal output limiting circuit for detecting high frequency noise and introducing noise (38) ), Comprising a local oscillator 39, and continuously monitoring the frequency to be monitored to compare the magnitude of the high frequency signal with the noise signal from which the noise signal of the set frequency is removed, classifying it by class, and Enable alarms.

The present invention detects defective equipment by using the same. The instantaneous and defective facility detection system 20 uses equipment from a geographic information-based management system (NDIS) operated by a power company to provide location information of an instantaneous target distribution line. The GPS receiver 24 and the analysis and recording device 23 are configured to provide the optimal instantaneous route by receiving the location information and guide the optimal instantaneous route so that the line instantaneous person can plan and drive the vehicle. An electric field signal of a wireless high frequency noise signal is input through an omni-directional active whip antenna installed at the top, that is, a receiving antenna 21, and passes through a high frequency amplifier 31 which amplifies it to measure fine values.

The analysis recording device 23 changes the frequency from 10 MHz to 600 MHz at a predetermined interval to the local oscillator 39 and supplies it to the intermediate frequency converter 32 to provide the amplitude modulation signal detector and the band pass filter 33 with a predetermined magnitude or more (90 dB). To detect the radio frequency noise signal.

When the signal is detected, the amplitude modulated signal detector and the band pass filter 33 immediately notify the analysis recording device 23, and registers the frequency to be monitored if it is not an existing registered frequency.

And a high frequency noise frequency monitoring receiver 22 continuously monitoring whether there is an amplitude modulation-type radio noise frequency among the high frequency signals received from the antenna and including a frequency of a predetermined size or more in the monitoring target list, and included in the monitoring target list. The noise signal comparison and class determination receiver 25 which continuously monitors the frequency to be monitored and compares the magnitudes of the high frequency signal and the voice signal from which the 60 Hz noise signal is removed and classifies them by class, and generates an alarm at a place where there is a possibility of danger Although having a function, the noise signal comparison and rating receiver 25 includes a voice signal output limiting circuit 38 capable of determining whether or not an impulsive noise component of a form generated in a power line is included in a high frequency inflow signal.

This is usually done by using an amplitude modulated detector using a diode and monitoring the incoming radio frequency signal, when an impulsive pulse with a ramp time of several hundred microseconds or less is introduced and its magnitude is more than 20 dB (Peak / Average) above the average value. The delay signal is generated so that the signal does not flow into the intermediate frequency amplifier 34 and the voice frequency amplifier 36 so as not to flow into the voice signal.

As shown in the example of the wireless noise signal emitted from the faulty equipment of FIG. 5, the radio frequency noise signal generated from the power line is a shock signal caused by the flow of the current which is very short before its duration does not exceed 0.01 cycle (167 microseconds). Is most of them.

In addition, when the ambient noise signal is strong, inter-modulation occurs and a 60Hz notch filter is installed in the voice frequency amplifier 36 to remove the noise signal directly flowing into the intermediate frequency circuit. It did not flow into the signal.

The output value of the voice signal processed in this way and the magnitude of the input radio frequency noise signal are compared and analyzed by the analysis and recording device 23, and the judgment is made, and an alarm is generated for a place requiring immediate action in the field and Take action to generate alarms of the appropriate class for continued management.

As described above, the instantaneous path and measurement time of the instantaneous vehicle by the GPS receiver 24, information on the location and measurement time of the measurement target facility, the moving speed of the instantaneous vehicle, the moving direction, and the high frequency noise monitoring receiver 25, the noise The information obtained through the signal comparison and the rating determination receiver 22 is recorded and analyzed by the analysis and recording device 23 for loading a program that can grasp the degree of risk for each grade and analyzing and recording the detection result. .

Here, the line instantaneous and bad facility detection system 20 is mounted on the instantaneous vehicle, it is preferable that the system is connected to the DC 12V cigar jack of the instantaneous vehicle and operated without a separate power supply.
And described in detail with respect to the set frequency and the audio signal in the instantaneous distribution line and faulty equipment detection system according to the present invention described above.
When the high frequency noise frequency monitoring receiver 22 of FIG. 4A detects the high frequency noise signal emitted from the faulty power distribution equipment, it notifies the analysis and recording device 23 and registers it as a new monitoring target frequency, and then compares and grades the noise signal. When 25 is tuned to the newly registered frequency and the demodulated voice signal has the power noise having the partial discharge characteristic, it is referred to as the set frequency when the voice signal characteristic as shown in FIG. 5 is obtained.
That is, when a new high frequency noise signal is detected and the demodulated speech output of this frequency has power frequency noise characteristics, it is defined as a set frequency in order to continuously monitor and compare the relationship with other frequency band signals at the same time.
The voice signal refers to a signal that is demodulated into a final frequency band after demodulating a high frequency signal (RF signal) of a set frequency and passing through the voice frequency amplifier 36 of FIGS. 4B and 4C. .

The result of measuring the high frequency noise signal generated in the distribution line by mounting the instantaneous and defective facility detection system according to the present invention in the instantaneous vehicle is as follows.

6 is a photograph showing a state of a suspension insulator in which insulation failure occurs, and FIGS. 7A to 7D are radio frequency spectrums measured based on a distribution pole of FIG. 6.

8 to 11 are instantaneous recording screens of a radio frequency spectrum and a distribution line measured based on a troubled distribution pole.

As shown in FIG. 6, the measurement results of the high frequency noise generated based on the distribution poles in which two side vanes fall out of the suspension insulator are not maintained as shown in FIGS. 7A to 7D.

FIG. 7A is a radio frequency spectrum measured at a distance of 1 km from a problem pole, and FIG. 7B is a table of frequency occupation bands measured at a distance of 6 km.

Here, "span" is the horizontal gap between the supports of the overhead transmission line.

7C is a waveform measured at a pole in which a problem occurs, and FIG. 7D is a table of frequency occupied bands measured at poles spaced one interval apart.

This shows that the frequency bands with the most change are 100-200MHz and 400-600MHz. As a result, the high frequency noise frequency generated in the electric pole can be seen in the whole band.

8 is a high-frequency signal of the amplitude modulation method measured (occupied) in the 10 ~ 1000MHz band at a distance of more than 15km away from the faulty pole before the start of the distribution pole by using the line instantaneous and bad equipment detection system according to the present invention Spectrum.

FIG. 9 is an amplitude modulated high frequency signal spectrum measured in the same range of frequency bands in a pole of which an arrester is bad.

FIG. 10 is a waveform of continuously recording an audio level generated when a radio frequency noise analyzing apparatus is installed and moved in a vehicle and passes a pole installed with a bad arrester.

Here, we can observe that the voice signal drops to almost zero level in the last week that passed through the time zones 08:35:30 ~ 08: 36; 15.

However, as shown in FIG. 11, the high frequency radio frequency noise signal was not changed at the same time.

As described above, the instantaneous distribution line and defective equipment detection system according to the present invention guides the route so that the instantaneous members can go to the distribution line to be inspected, and over a certain size (90dB) generated in the distribution line during the run. It is a system that detects and manages a bad electric pole by grasping the frequency of the high frequency wireless noise signal of amplitude modulation type, comparing the magnitude of the high frequency received signal with the magnitude of the voice signal passing through the power noise filter.

Specifically, the process distribution line instantaneous process using the instantaneous distribution line and faulty equipment detection system according to the present invention and the faulty equipment detection step are as follows.

12A to 12D are flow charts illustrating an instantaneous distribution line defect detection method and a failure detection method according to the present invention, and FIG. 13 is a diagram illustrating a correlation between a high frequency noise frequency and a reach distance.

14 is a screen output configuration diagram of the field acquisition information using the instantaneous distribution line and faulty equipment detection system according to the present invention.

The instantaneous and faulty equipment detection method of the overhead distribution line according to the present invention is largely divided into the frequency scan processing step for the high frequency noise analysis, the power frequency noise processing step for the high frequency noise analysis, the high frequency noise field strength and the noise signal after the noise processing. The comparison step, the high frequency noise rating display step, and the alarm processing step according to the high frequency noise analysis results.
Here, the process of classifying by class by comparing the magnitude of the voice signal to remove the high-frequency signal and the noise signal of the set frequency by continuously monitoring the monitoring target frequency as follows.
The poor insulation object installed in the distribution line emits a high frequency noise signal including a voice signal synchronized to a power source frequency (60 Hz or 50 Hz) as shown in FIG. 5 over a full band frequency as shown in FIGS. 7B and 7C.
Accordingly, as shown in FIGS. 7A and 8, broadcasting and radio station frequencies are first identified in an area to which the distribution line is to be instantiated, and normal radio frequencies are registered as scan exclusion targets, thereby reducing measurement time.
After selecting a clear frequency band with no noise signal other than the scan exclusion frequency, if a signal of more than a certain value (-90dBm) is detected, this frequency information is sent to the noise signal comparison and rating receiver and fixed at this frequency. Watch.
Noise Signal Comparison and Rating The receiver first analyzes the voice signal received from the newly registered monitoring target frequency, and if it is determined to be the noise due to the failure of the distribution equipment, assigns it as the set frequency for the next step of the comparison determination. If it is determined that the noise is not caused by the noise, it is registered as a scan exclusion target.
Then, the high frequency electric field strength level including the GPS signal is measured as shown in FIG. 11 and the voice signal level passing through the power frequency filter as shown in FIG.
That is, when the set frequency is newly registered, the noise signal comparison and rating receiver compares the voice output signal with other pre-registered set frequencies to determine the class thereof. Separate.
In the noise signal comparison step, after tuning to the newly registered set frequency, the voice signal before the filter insertion (high frequency field strength value) and the filtered voice signal value after insertion are measured and recorded, and the two voice signal level differences are recorded in the memory. do. In addition, the step of comparing and measuring the voice output level before and after inserting the filter in the same manner to the other registered set frequency and record it in the memory.
In the noise class determining step, after comparing the noise signals, the signal frequency having the largest difference value is identified among the data stored in the memory, and it is checked whether there is a set frequency of a higher frequency than this signal.
As the frequency is higher as shown in FIG. 13, the shorter the reach, the grade is determined as shown in FIGS. 12A to 12D by using the correlation between the highest frequency among the set frequencies and the frequency with the largest difference value. When this is done, the alarms defined for that level are triggered and recorded.

Specifically, a high frequency noise monitoring receiver 22 and a noise signal comparison and rating receiver 25 are connected to the radio frequency noise signal receiving antenna 21, and the high frequency noise monitoring receiver 22 is used in the 10 to 600 MHz band. Continuously scan whether an amplitude modulation type wireless noise signal is detected (S1101).

The frequency in which the radio noise signal having the reference value or more set in the scan step is recorded is recorded (S1102).

Here, the set reference value is preferably set to -90 dBm.
-90dBm is set to the high-frequency noise signal detection threshold in the distribution line instantaneous and faulty equipment detection system of the present invention.

It is determined whether the recorded frequency is a previously registered frequency (S1103). If it is not the previous registered frequency, it is determined that the recorded frequency is a monitoring target frequency and registered. (S1104)

As described above, the recording of the frequency at which the radio noise signal is higher than the reference value set in the scanning step is to use the information acquired in the instantaneous process at the present time in the subsequent instantaneous step.

As described above, while the scan of the wireless noise signal using the high frequency noise monitoring receiver 25 and the registration of the monitored frequency are in progress, the frequencies in the monitored frequency list are continuously used using the noise signal comparison and rating receiver 22. Tuning (S1105)

Next, the radio frequency field strength level value for each frequency is measured and recorded including time and position information (S1106).

Here, the analysis and recording device 23 acquires the vehicle moving position, time, and speed related information through the GPS receiver 24, and the radio frequency field strength for each frequency measured from the noise signal comparison and rating receiver 22. Store the level together.

If it is determined that it contains the 60Hz power supply noise (S1107) and determines that it contains 60Hz power supply noise, the radio frequency signal is passed through the demodulator to pass through the 60Hz noise filter to cancel the noise (S1108).

As such, when the noise is removed and the radio frequency field strength level values are stored for each frequency, the analysis and recording device 23 compares the radio frequency field strength values with the voice signal level values passed through the 60 Hz power noise filter (S1109). In operation S1110, the power noise level included in the radio frequency signal is determined.
In other words, line failure in a distribution system is caused by breakdown, and local partial discharge occurs at weak points inside or outside the insulating material before this phenomenon occurs.
According to the present invention, as shown in FIG. 5, the charging and discharging phenomenon of the small energy occurs before the maximum and the lowest points of each cycle of the power supply voltage, and the noise of the high frequency signal due to such a very short instant charge and discharge phenomenon. Release energy.
As shown in FIGS. 7B to 11, the frequency resonates to a frequency of several tens to hundreds of MHz to conduct energy by conducting radiation through electric radiation or power in free space. As a result of poor insulation, the radiated energy increases and occupies a frequency. The band is also wider.
As such, even a noise signal resonated at a frequency of several hundred MHz can be demodulated like a general receiver to obtain a voice signal synchronized with a power frequency, and can be compared and analyzed to easily detect noise generated by a poor facility installed in a distribution line in a free space. To detect and determine it.

Here, the power noise level included in the radio frequency signal is determined by dividing the difference by stages (10dB, 20dB, 30dB, 40dB, voice signal = 0).

The noise class determined in this way is compared with the previous level (S1111), and the same noise class is displayed at the same level (S1112), and the new noise class is displayed at another level (S1113).

Then, it is checked whether the entire measurement of the monitored frequency is completed in the corresponding area (S1114), and if it is finished, the alarm level according to the noise level is determined. (S1115)

However, as shown in FIG. 13, when the frequency generated from the power line is high, the distance reached (measurable) is shortened, and it is first checked whether the highest frequency of the monitored frequencies is the highest (S1116).

If the highest frequency and other low frequencies are the same level (S1117) and nearby poles are above the alarm level 3 (S1118), this is a case where the deterioration of the power distribution equipment has progressed considerably. Classify and process. (S1119)

If the highest frequency is the highest level but the other level is not low, it may be the case that the faulty equipment is in the vicinity, so the alarm should be lowered by one level than the above and classified into three stages. (S1120)

Although the highest rating is not available at the highest frequency (S1121), if the surrounding high frequency noise is observed in the lower than three-class and low frequency bands, but no voice signal is detected, the distribution equipment may be broken. Classify it to be processed (S1123).

If no signal is found even at low frequencies, it is determined to be a less important fault and the alarm is applied in one step. (S1121, 1122, 1123, S1124, S5125)

As a result of measuring the noise signal by performing the instantaneous and defective equipment detection step of the overhead distribution line according to the present invention, it is displayed on a map, as shown in FIG. ) Is displayed on the screen.

The system and method for detecting instantaneous and faulty facilities of the overhead distribution line according to the present invention as described above are equipped with a device for analyzing high frequency noise generated by the faulty facilities and a satellite navigation system (GPS), and thus the location and measurement of the corona noise measurement target facility. The system includes a management system that can record and display the time at the same time, and can be mounted on instantaneous vehicles to accurately determine the operation status of the equipment on the ground without the need for a permanent boarding operation.

It will be appreciated by those skilled in the art that various changes and modifications can be made without departing from the technical details of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Such instantaneous and defective equipment detection system and method for overhead distribution line according to the present invention has the following effects.

First, it is possible to identify defects such as internal insulation deterioration and cover covered areas that were not detected in the instantaneous distribution line using visual cameras and infrared cameras, which are currently performing defects that account for 30% of distribution line failure causes. This can drastically reduce the failure caused by equipment failure.

Second, it solves the problem of checking the live ships, which is currently being spent on a large budget, and makes it possible to check the equipment that is not visible to the naked eye even if a live worker checks the equipment installed on the upper part of the pole with the naked eye. It can be detected from the ground, reducing budget and preventing worker accidents.

Third, it is possible to manage and record and compare the measured values periodically by simply using a vehicle for facility inspections that are not continuous but focused on a specific period of time.

Fourth, instantaneous workers in distribution lines without specialized knowledge of high frequency and high voltage can easily identify the problem spot in the field.

For example, it is possible to reduce manpower and improve work efficiency by simultaneously monitoring and monitoring the status of the distribution cautions while watching other tasks when installed in a general vehicle without the need for instantaneous specialists.

Claims (14)

To detect high frequency noise by analyzing high frequency noise generated from power distribution facilities, A high frequency noise monitoring receiver which continuously monitors the presence or absence of an amplitude modulation type radio noise frequency among the received high frequency signals and registers a frequency of a predetermined size or more in the monitoring target list; A noise signal comparison and rating determination receiver configured to continuously monitor the registered monitoring target frequency, compare a high frequency signal with a magnitude of a voice signal from which a noise signal of a set frequency is removed, and classify them for each class to generate an alarm; And an analysis and recording device for displaying the information acquired through the receivers on the topographic map and analyzing and recording the detection result. According to claim 1, The instantaneous distribution line and faulty equipment detection system, An instantaneous and defective equipment detection system for a overhead distribution line, which is mounted on a vehicle to receive and analyze high frequency signals while moving, in order to grasp the driving state of the column equipment from the ground in the live state without the operation of the column. According to claim 1, The instantaneous distribution line and faulty equipment detection system, It receives the installation information of the instantaneous distribution line from the distribution management system (NDIS) operated by the electric power company, creates the instantaneous route by using it, and analyzes and measures the information obtained by instantaneously executing the distribution line with the optimal route. And a GPS receiver for recording the measurement position information, the moving speed, and the traveling direction together. In order to detect a defective location of a power distribution facility mounted on an instantaneous vehicle, A receiving antenna for receiving a radio frequency radiated from a distribution line facility; A high frequency noise monitoring receiver which continuously monitors the presence or absence of a radio noise frequency in the form of amplitude modulation among the received high frequency signals and includes a frequency of a predetermined size or more in the monitoring target list; A noise signal comparison and rating determination receiver which continuously monitors the monitored target frequency, compares a high frequency signal with a magnitude of a voice signal from which a noise signal of a set frequency is removed, classifies it by class, and generates an alarm at a place where there is a possibility of danger; Receive the installation information of the instantaneous distribution line from the distribution management system (NDIS) operated by the power company, create the instantaneous route using this, and analyze the information acquired by performing the instantaneous distribution line with the optimal route and measure the noise A GPS receiver for recording and displaying information of facility location and measurement time, moving speed of the instantaneous vehicle, and traveling direction; An analysis and recording device for displaying the information acquired through the receivers on a topographic map and analyzing a detection result, and having a program equipped with a program for grasping the risks of the grades thereof. Facility detection system. The method of claim 1 or 4, wherein the high frequency noise monitoring receiver, A system for monitoring instantaneous and defective equipment of a overhead distribution line, comprising continuously monitoring frequencies in the 10 to 600 MHz band and including a frequency of -90 dBm or more set as a high frequency noise signal detection threshold in the monitoring target list. The method according to claim 1 or 4, wherein the noise signal comparison and rating receiver is: 2. The instantaneous and defective equipment detection system of a overhead distribution line, wherein the frequency set to remove the noise signal is 60 Hz. The method according to claim 1 or 4, wherein the noise signal comparison and rating receiver is: 2. A system for detecting instantaneous and defective equipment of a distributed distribution line, comprising a voice signal output limiting circuit configured to determine whether an impulsive noise component of a form generated from a power line is included in a high frequency inflow signal. To detect high frequency noise by analyzing high frequency noise generated from power distribution facilities, Scanning the received frequency for high frequency noise analysis; Processing power frequency noise of a frequency registered in the scanning step; Comparing the high frequency noise field strength with a speech signal after noise processing; And displaying a high frequency noise class according to the comparison result and performing an alarm process according to a high frequency noise analysis result. These process steps are performed during the movement of an instantaneous vehicle equipped with a system. The method of claim 8, wherein the scan processing of the received frequency comprises: Connect a high frequency noise monitoring receiver and a noise signal comparison and rating receiver to a radio frequency noise signal receiving antenna; Continuously scanning whether an amplitude modulation type wireless noise signal is detected using a high frequency noise monitoring receiver; Recording a frequency having a wireless noise signal equal to or greater than a reference value set in the scanning step; And if the recorded frequency is not the previous registered frequency, determining that the frequency is a monitored target frequency, and registering the detected frequency. The method of claim 9, wherein in the step of scanning the received frequency: 12. A method for detecting instantaneous and defective equipment of a overhead distribution line, comprising continuously monitoring frequencies in the 10 to 600 MHz band and including a frequency of -90 dBm or more set as a high frequency noise signal detection threshold in the monitoring target list. 9. The method of claim 8, wherein processing power frequency noise of the registered frequency comprises: Continuously tuning the frequencies in the monitored frequency list using a noise signal comparison and rating receiver; And measuring and recording the radio frequency field strength level value for each frequency including time and position information. The method of claim 8, wherein the comparing the high frequency noise electric field strength with the noise signal after noise processing comprises: Determining whether it contains 60 Hz power noise, If it is determined that it contains 60 Hz power noise, the radio frequency signal is passed through a demodulator to pass a 60 Hz noise filter to cancel the noise; When the noise reduction and the storage of the radio frequency field strength level value for each frequency is made, comparing the radio frequency field strength value and the voice signal level value passing through the filter, the instantaneous and defective equipment detection of the overhead distribution line Way. The method of claim 8, wherein the displaying of the high frequency noise class and performing an alarm process according to a high frequency noise analysis result include: Determining the power noise level included in the radio frequency signal by section; Comparing the determined noise rating with a previous level, Displaying the same noise class at the same level, and displaying the new noise class at other levels, Determining whether the noise class is above a set level; Determining the alarm level according to the noise class, if the predetermined class or more, and outputting different kinds of alarms according to the noise class, the instantaneous and defective equipment detection method for the overhead distribution line. The method of claim 8, wherein Method for detecting the instantaneous and defective equipment of the overhead distribution line, characterized in that the obtained information is displayed on the screen of the analysis and recording device differently according to each risk on the map.

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