KR101977093B1 - Apparatus and method for surveying power lines - Google Patents

Abstract

According to an embodiment of the present disclosure for realizing the above-described problem is disclosed an apparatus for receiving power line detection signal for power line exploration. A magnetic field sensor for detecting a magnetic field signal generated at a power line, the magnetic field signal being induced by a load current and a probe current signal; A band pass filter for generating a probe magnetic field signal by removing a magnetic field signal induced by a load current among magnetic field signals input to the magnetic field sensor; And a digital converter for digitizing the signal passing through the band pass filter, and determining whether the probe magnetic field signal is composed of a predetermined signal, and if the probe is composed of a predetermined signal, the same after a predetermined time interval. It may be determined whether the probe magnetic field signal is detected, and when the same probe magnetic field signal is detected after a predetermined time interval, it may be determined that the probe magnetic field signal is detected.
After filtering, there are still many signals similar to the path-detection current pulses, so the detection signal cannot be accurately distinguished by simple maximum detection.
Instead of judging the entire signal unnecessarily, the system detects and compares the signal only during the time zone in which the signal pulse occurs.
In the previous method, the signal of the magnetic field measured in units of 1 cycle (for 16.7 msec) was measured and compared with the previous measurement to determine the presence or absence of the detection signal.

Description

Power line exploration device and power line exploration method {APPARATUS AND METHOD FOR SURVEYING POWER LINES}

The present invention is an exploration technology for grasping the installation (burying) path of power lines that are buried or concealed in the ground and not visible to the naked eye, or identifying the power lines and load side divisions of the power lines and exposed branches at exposed locations. The present invention relates to a method for exploring where a power line or the like is affected by a magnetic field signal caused by a load current in a transformer or the like.

In order to explore the installation path of power lines that are buried or concealed in the ground and not visible to the naked eye, the inventors have applied to the load side of the power lines operating in the Republic of Korea Patent Registration 10-0778089 The terminal generates a short instantaneous current (current impulse) signal using the terminal device, and the magnetic field signal induced by the flowing current is detected by contacting the surface of the power line on the middle path of the power line or by detecting the magnetic field signal in a non-contact way on the ground. Introduced the system and method to find out the route of the buried device or the main device installed in the transformer (power source) to transfer the power line information to the terminal device to determine the line configuration.

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The present disclosure has been made in response to the above-described background, and is to provide an apparatus and method for accurately searching a buried path of a power line through a probe magnetic field signal.

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According to an embodiment of the present disclosure for realizing the above-described problem is disclosed an apparatus for receiving power line detection signal for power line exploration. The power line probe signal receiving apparatus is a magnetic field sensor for detecting a magnetic field signal generated from a power line, the magnetic field signal is induced by the load current and the probe current signal, and induced by the load current of the magnetic field signal input to the magnetic field sensor A band pass filter for generating the probe magnetic field signal by removing the magnetic field signal, and a digital converter for digitizing the signal passing through the band filter, and determining whether the probe magnetic field signal is composed of a predetermined signal, and In the case of a predetermined signal, it is determined whether the same probe magnetic field signal is detected after a predetermined time interval, and when the same probe magnetic field signal is detected after a predetermined time interval, the probe magnetic field signal is detected. It can be judged that.
Alternatively, the digital converter determines the value of the magnetic field signal as signal 1 or signal 0 based on the magnitude of the average value of the magnetic field signal for one cycle, or the peak of the magnetic field signal at the zero crossing point of each cycle. The value of the magnetic field signal may be determined as the signal 1 or the signal 0 based on the value.
Disclosed is a terminal apparatus for transmitting a power line discovery signal according to another embodiment of the present disclosure. The terminal for transmitting the power line detection signal may be configured to synchronize the probe signal generation time of the terminal device for transmission of the power line probe signal with the probe signal detection time of the power line probe signal receiver to detect the probe signal. A probe current signal including a signal 1 for generating a current pulse and a signal 0 for not generating a current pulse in a predetermined configuration may be generated at predetermined time intervals.
Also, a power line exploration method according to another embodiment of the present disclosure is disclosed. The power line detection method is configured to synchronize the detection signal generation time of the terminal device for transmission of the power line detection signal with the detection signal detection time of the power line detection signal receiver to generate a current pulse so that the power line detection signal receiver can detect the detection signal. Connecting a terminal device for power line probe signal transmission to a power line for generating a probe current signal including a signal 1 to generate and a signal 0 not to generate a current pulse in a predetermined configuration at a predetermined time interval; A magnetic field sensor for detecting a magnetic field signal generated from a power line on a power line installation path of a terminal device for signal transmission, wherein the magnetic field signal is induced by a load current and a probe current signal, and the magnetic field signal input to the magnetic field sensor. Removes the magnetic field signal induced by the heavy load current A band pass filter and a digital converter for digitizing the signal passing through the band pass filter, and determining whether the probe magnetic field signal is composed of a predetermined signal, and, if configured with a predetermined signal, a predetermined time interval. Subsequently, it is determined whether the same probe magnetic field signal is detected, and when the same probe magnetic field signal is detected after a predetermined time interval, the power line probe signal receiving unit determines that the probe magnetic field signal has been detected. And performing power line exploration.

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Improved route detection accuracy and minimized ambient effects

1 is a path detection device in the previous technology
2 is a comparison of voltage waveform and current detection signal generation time
Figure 3 is a downward upward direction zero crossing time comparison
4 is a comparison of 0 and 1 values.
5 is a probe signal waveform included in a large current load
6 is a value of analyzing the detection signal included in the large current load
7 is a comparison of the phase current and the neutral current waveform
8 is a neutral current waveform example
9 is a sequence of phase change of neutral current
10 is a pulse analysis example contained in the neutral current
11 is an example of the detection signal input stage change (improvement) circuit
12 is an example of the phase current and neutral current waveform after the detection signal input stage change
Figure 13 is an example of the detection signal classification method when the synchronization is not achieved (previous technology)
Fig. 14 shows the continuous generation of the peak waveform of the load current rather than the detection signal.
15 illustrates a time synchronization frame for improving the accuracy of detection signal detection.
Figure 16 illustrates the detection signal classification method by comparing the peak value (if the signal is not)
Figure 17 shows the detection signal classification method (in the case of a signal)
FIG. 18 is an explanatory diagram illustrating the polarity classification method of the detection signal, and FIG. 19 is an explanatory diagram of the detection magnetic field signal detection method.

The key is to accurately detect the magnetic field signal generated by the generation of short-term exploration current signals in the ground or on the ground in order to detect the power line installation (ground) route or the circuit configuration information in the transformer or manhole. .
1 to 19 is a power line detection signal receiving device and a power line detection method, Figure 1 is a configuration example of the power line installation path and line detection in the existing technology. That is, the main device 20 on the power supply side and the terminal device 30 on the load side are connected to the merchant line 11 of the power line in order to explore the circuit configuration and installation path of the power lines connected to the transformer 10 and supplying power. Connected to the neutral (12) to flow a signal with a probe current of 60 ~ 100A at a very short moment (0.5 ~ 1.5 msec). The magnetic field signal 32 is formed along the power line according to the flow of the exploration current 31, and the path detecting device detects the installation (burying) path of the embedded power line by using a sensor such as a ferrite coil by contacting it on the ground ( 40) Rogo-ski to contact the ferrite coil or Rogowski coil 22 on the surface of the power line without removing the insulation from the exposed power line, such as transformer or manhole, to grasp the configuration of the power line, etc. The line (configuration) exploration 21 is performed using the coil 22 or the like.
2 illustrates generation of exploration current 104. The power frequency (50 or 60 Hz) voltage signal waveform 101 has an upward zero crossing point 106 and a downward zero crossing point 105 in which the load current is minimum (0), which is slightly below the downward zero crossing point. When the exploration current pulse 104 is generated, it is larger than the maximum point 103 of the load current waveform 102 so that the magnetic field signal is detected by the path probe or the main device for one cycle at a random (random) starting point. (16.7msec at 60Hz) The accumulated value of the magnetic field signal was measured for the time, so it was easy to distinguish between the presence and absence of the detection signal (1). 3 shows the relationship between the downward and upward zero crossing points and the probe current pulses.
However, when the size of the probe current 104 is larger than the load current 102 as shown in FIG. 4, one cycle (16.7 msec, 60 Hz) at a random (random) starting point when the path or the line of the power line is detected. While the accumulated value of the magnetic field signal was measured and compared with that of the previous cycle, the presence or absence of the signal value (1,0) was determined.
However, in the above method, the load current is smaller than the probe current as shown in FIG. 2, and the detection signal can be clearly distinguished when there is only one power line, but the magnetic field signal is mixed due to the concentration of several power lines such as near a transformer or manhole. It is not applicable where complex waveforms appear
The following is a waveform of magnetic field signal measured near transformer. The peak point of the yellow point is continuously displayed with the same value as +-. In this case, the magnetic field signal due to the exploration current is not so large that it can be accurately detected by analyzing it in detail.
To prevent errors caused when detecting the presence of the detection signal by detecting the magnetic field signal induced by the addition of the load current and the detection current signal as above,
Changed function and added
1. Remove load current
2. Time synchronization function
First of all, in order to compare only the magnetic signal generation section induced by the probe current signal generated by the terminal equipment without comparing the entire magnetic field signal, the value of the magnetic field signal induced from the load current is removed.
As mentioned above, in the conventional technology, the magnetic field signal induced by the sum of the load current and the probe current signal is compared every cycle, and if there is a change in the signal value, it is determined as 1 or 0. However, as described above, the detection signal detection is influenced by the magnitude of the magnetic field signal induced by the load current to eliminate the magnetic field signal induced by the load current (60 Hz to 300 Hz) between the input signal and the digital converter (ADC). A 600 Hz band filter was added to detect only the magnetic field signal induced by the probe current signal.
After filtering, the input signal of the digital converter (ADC) of the path probe device shows only the high frequency component of the 600 Hz band as shown below. The digital converter ADC may digitize the signal passing through the band pass filter. More specifically, the ADC may divide the probe magnetic field signal generated by the band pass filter into cycle units and convert the cycle into a digital number including a signal 1 or a signal 0. Here, the output unit of the digital converter may be 1 bit.
In order to improve the accuracy of detection signal detection, minimize the influence of other signals by synchronizing the signal generation time and signal detection time and reducing the detection time in the following order.
1. Connect the terminal equipment to the power line and switch to path detection current pulse generation mode. More specifically, the terminal device for transmitting the power line discovery signal may be connected to the power line. Then, the power frequency flowing through the power line through the terminal device can be measured. In addition, the terminal device may generate a probe magnetic field signal and transmit it on the power line.
2. The terminal equipment for power line discovery signal transmission may generate a pattern on the current pulse by generating or not generating a current pulse based on the waveform of the power frequency. More specifically, the terminal device can identify a downward zero crossing point passing 0V in the-direction and an upward zero crossing point passing in the + direction in the waveform of the power frequency. The terminal device may generate a current pulse at the zero crossing point. For example, the terminal equipment generates a current pulse of 1 to 1.5 msec near the downward zero crossing point of the power frequency (signal 1) and does not occur in the next period (after 1T = 16.7 msec) (signal 0). In the next cycle, 1010 signals are generated once by generating a current pulse (signal 1). After 1.9 seconds (114 cycles at 60Hz), the 1010 signal and three additional zeros are sent again to detect the probe. The generation of the above-described current pulse is only an example, and the present disclosure is not limited thereto.
3. In a noisy area, false peaks may occur, so the path sensor's magnetic field sensor detects the first peak value of the magnetic field received and checks if the same signal continues in the next period. If the same peak values are continuous, this peak point is ignored.
That is, since the peaks of A and B of FIG. 16 are repeated in the next cycle (C), the peaks are ignored and the third peak, the village, is checked to see if there is a next peak.
4. At the peak edge, the path probe is located close to the power line to detect the first maximum peak of the magnetic field generated by the current pulse.
However, after filtering, many signals similar to the path search current pulses are still contained. Therefore, the detection signal cannot be accurately distinguished by simple maximum value detection. Therefore, the detection signal detection method is synchronized with the current generation time as follows.

Instead of judging the entire signal unnecessarily, the system detects and compares the signal only during the time zone in which the signal pulse occurs.

In the previous method, the signal of the magnetic field measured in units of 1 cycle (for 16.7 msec) was measured and compared with the previous measurement to determine the presence or absence of the detection signal.

This program is the operation program of the path detection device that detects the installation (burying) path by detecting (detecting) the magnetic field signal generated by the current impulse signal flowing through the power line from the ground. Previously, only the peak value was compared to the zero crossing point of each cycle, and it was determined as 1 or 0. However, in this program, the Ta function comparing the average value and the T function comparing the peak value are alternately explored.

1. After initializing the device, the starting point can be matched for comparison in synchronization with the period (cycle) of scanning by the initial current impulse signal. More specifically, the digital converter may determine whether the probe magnetic field signal is composed of a predetermined signal and digitize it. Then, it may be determined whether the first pulse signal of the probe magnetic field signal output from the digital converter is recognized. The digital converter detects the first peak value of the magnetic field signal and checks whether the same peak value continues in the next period. The digital converter may ignore the first peak value when the same peak value is continuous. In addition, when the successive peak values are different, the digital converter may convert the highest peak value among the successive peak values into signal 1 and output the signal. Accordingly, the digital converter can match the average starting point for comparison by the starting point of the peak value at which the signal is output to 1.
2. In order to synchronize the current impulse signal generated every 1.9 seconds, after detecting the first detected pulse signal, it is possible to recognize the presence of the next signal at 1.9 seconds-7Cycle time point, and if the value of 7bit is 0101000, it can be recognized as the detection signal. have. More specifically, when the first pulse signal is recognized by the digital converter, it may be determined whether the pulse signal detected during the predetermined time interval is the predetermined signal pattern. In addition, when a predetermined signal pattern is detected in the pulse signal, it may be determined that the probe magnetic field signal is detected. From the signal output as 1 in the digital converter, it is possible to recognize the digitized signal value for each cycle for a predetermined time interval. For example, starting from the point at which the first recognized pulse signal is 1, seven bit values output from the digital converter can be checked for 1.9 seconds corresponding to seven cycles at 60 Hz. When 7 bits are 0101000, it may be determined that the probe magnetic field signal is detected. The specific numerical description of the detection determination of the above-described probe magnetic field signal is merely an example, and the present disclosure is not limited thereto.

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3. The presence or absence of the signal can be classified by comparing the magnitude of the average value with the previous value, and the value of the signal magnitude can be expressed as the peak magnitude value. The digital converter according to the exemplary embodiment may determine the value of the magnetic field signal as 0 or 1 based on the magnitude of the average value of the magnetic field signal during one cycle. Alternatively, the value of the magnetic field signal may be determined as the signal 1 or the signal 0 based on the peak value of the magnetic field signal at the zero crossing point of each cycle.

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Claims (4)

A power line detection signal receiver for power line exploration,
A magnetic field sensor for detecting a magnetic field signal generated at a power line, the magnetic field signal being induced by a load current and a probe current signal;
A band pass filter for generating a probe magnetic field signal by removing a magnetic field signal induced by a load current among magnetic field signals input to the magnetic field sensor; And
A digital converter for digitizing the signal passing through the band pass filter;
Including,
It is determined whether or not the probe magnetic field signal is composed of a predetermined signal, and if it is composed of a predetermined signal, it is determined whether the same probe magnetic field signal is detected after a predetermined time interval, and after the predetermined time interval When the same probe magnetic field signal is detected, determining that the probe magnetic field signal is detected,
Power line probe signal receiver. The method of claim 1,
The digital converter determines the value of the magnetic field signal as the signal 1 or the signal 0 based on the magnitude of the average value of the magnetic field signal for one cycle, or based on the peak value of the magnetic field signal at the zero crossing point of each cycle. Determining the value of the magnetic field signal to be signal 1 or signal 0,
Power line probe signal receiver. A terminal apparatus for transmitting power line probe signals,
A current pulse to allow the power line probe signal receiver to detect the probe signal by synchronizing the probe signal generation time of the terminal device for power line probe signal transmission and the probe signal detection time of the power line probe signal receiver according to claim 1 Generating a probe current signal at a predetermined time interval comprising a signal 1 for generating a signal and a signal 0 for not generating a current pulse in a predetermined configuration;
Terminal for transmitting power line probe. In the power line exploration method,
A signal 1 for generating a current pulse so that the power line probe signal receiver detects the probe signal by synchronizing the probe signal generation time of the terminal device for transmission of the power line probe signal with the probe signal detection time of the power line probe signal receiver; Connecting a terminal device for power line probe signal transmission to a power line for generating a probe current signal including a signal 0 which does not generate a current pulse in a predetermined configuration at a predetermined time interval;
Magnetic field sensor for detecting a magnetic field signal generated from the power line on the power line installation path of the terminal device for transmitting the probe signal, the magnetic field signal is induced by the load current and the probe current signal, input to the magnetic field sensor A band pass filter for generating a probe magnetic field signal by removing the magnetic field signal induced by the load current among the magnetic field signals, and a digital converter for digitizing the signal passing through the band filter, wherein the probe magnetic field signal is converted into a predetermined signal. Determining whether or not it is configured, and when configured with a predetermined signal, determining whether the same probe magnetic field signal is detected after a predetermined time interval, and when the same probe magnetic field signal is detected after a predetermined time interval, Using a power line probe signal receiving apparatus for determining that the probe magnetic field signal has been detected Performing power line exploration;
Including,
Power line exploration method.

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