Method and system for on-line diagnosis and positioning of electric leakage fault points of airport approach light line

Abstract

The present application belongs to the technical field of cable line operation and maintenance, and relates to an online diagnosis and positioning method and system for an airport navigation light line leakage fault point. The method comprises: injecting a detection signal into the cable core through an incident coil; collecting a reflected signal of the detection signal in the cable line by a coil, calculating a similarity comparison value of the reflected signal and the delayed detection signal; calculating the covariance of the delayed detection signal and the reflected signal to obtain a correlation coefficient; determining the cable line leakage fault state according to the similarity comparison value and the correlation coefficient; and determining the distance of the leakage position point from the incident coil according to the propagation speed and the delay time of the detection signal in the cable core. The present application can monitor the operation state of the directly buried cable line in real time, quickly and accurately locate the cable line leakage fault point position, help to reduce the manual maintenance operation time and workload, and improve the operation and maintenance efficiency of the airport power supply system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cable line operation and maintenance, and in particular, relates to an online diagnosis and positioning method and system for an airport navigation light line leakage fault point. BACKGROUND

[0002] The stability of the airport power system is related to the safe operation of the whole airport, and the power cable line is an important part of the airport power system. The running state of the cable loop of the airport navigation light system plays a key role in the safety of the takeoff and landing of the aircraft. As a key facility to ensure the power supply of the airport, the running stability of the airport cable line is directly related to the normal operation of the airport and the safe travel of passengers. However, due to the complex environment of the airport, the cable line is widely distributed and has been in a high-load running state for a long time, and leakage faults occur from time to time.

[0003] Traditional cable line leakage fault diagnosis and positioning methods, such as insulation resistance testing and bridge method, have low detection accuracy, are greatly affected by environmental factors, and are difficult to quickly and accurately locate the fault point position. In particular, in places such as airports where the reliability of power supply is extremely high, these methods often cannot meet the actual needs, resulting in long fault elimination time and affecting the normal operation order of the airport. Therefore, how to effectively diagnose and locate the leakage fault point of the airport cable line has important practical engineering significance.

[0004] Due to the excessive length and complexity of the cable line of the airport navigation light system, the airport operation and maintenance department currently lacks feasible detection and management means, and most existing detection methods require power-off maintenance, which will inevitably affect the normal operation and efficiency of the airport. Therefore, it is necessary to carry out corresponding research on this problem to research new technologies that can real-time, quickly and accurately judge the leakage fault state and fault positioning of underground cable lines. SUMMARY

[0005] In order to solve the above technical problems, the present application provides an online diagnosis and positioning method and system for an airport navigation light line leakage fault point.

[0006] In a first aspect, the present application provides an online diagnosis and positioning method for an airport navigation light line leakage fault point, comprising:

[0007] Injecting the detection signal into the cable core through the incident coil;

[0008] Collecting the reflection signal of the detection signal in the cable line by the coil, and calculating the similarity comparison value of the reflection signal and the delay detection signal; the delay detection signal is the detection signal corresponding to the delay time relative to the collection time when the reflection signal is collected;

[0009] The covariance of the delay detection signal and the reflection signal is calculated to obtain a correlation coefficient;

[0010] According to the similarity comparison value and the correlation coefficient, a cable line leakage fault state is determined.

[0011] According to the propagation speed of the detection signal in the cable core and the delay time, a distance of a leakage position point from the incident coil is determined.

[0012] In a second aspect, the present application provides an online diagnosis and positioning system for an airport navigation light cable line leakage fault point, comprising a cable line, an incident unit, a collection unit, a detection signal generation unit, a reflection waveform processing unit, an incident waveform delay unit, and a data processing unit.

[0013] The incident unit and the collection unit are respectively sleeved on the cable line.

[0014] After the detection signal generation unit generates the detection signal, the incident unit injects the detection signal into the cable core of the cable on the cable line.

[0015] The collection unit collects the reflection signal of the detection signal in the cable line; the reflection waveform processing unit processes the reflection signal and outputs it to the data processing unit; the incident waveform delay unit is used to output the delay detection signal to the data processing unit; the delay detection signal is the detection signal corresponding to the delay time relative to the collection time when the reflection signal is collected.

[0016] The data processing unit calculates the similarity comparison value of the reflection signal and the delay detection signal, calculates the covariance of the delay detection signal and the reflection signal to obtain a correlation coefficient, and determines the cable line leakage fault state according to the similarity comparison value and the correlation coefficient, and determines the distance of the leakage position point from the incident coil according to the propagation speed of the detection signal in the cable core and the delay time.

[0017] On the basis of the above technical solution, the present application can also be improved as follows.

[0018] Further, the detection signal is obtained by performing AND operation on the cosine signal output by the cosine carrier unit and the chaotic sequence generated by the signal modulation unit.

[0019] Further, the peak value of the cosine signal is , the waveform of the chaotic sequence is , the period of the waveform of the chaotic sequence is , and the detection signal is , is the frequency, is the time, represents the number of continuous symbols existing in the period , and represents the AND operation, and the detection signal is represented as:

[0020] .

[0021] Further, assuming the sampling frequency of the reflected signal is , the detection signal is , and the reflected signal is , is time, characterizing the distortion and attenuation coefficient of the reflected signal compared with the detection signal , and are constants, the reflected signal is represented as:

[0022] .

[0023] Further, assuming the reflected signal is , the delayed detection signal is , is time, is the delay time, and the similarity comparison value is , is the period of the waveform of the chaotic sequence, the similarity comparison value is:

[0024] .

[0025] Further, the covariance of the delayed detection signal and the reflected signal is calculated to obtain the correlation coefficient, including: assuming the detection signal is , the reflected signal is , is the delay time, and the correlation coefficient is , is the delayed detection signal, is the period of the waveform of the chaotic sequence, is the average value of the delayed detection signal , is the average value of the reflected signal , is the variance value of the delayed detection signal , is the variance value of the reflected signal , and the expression of the correlation coefficient is:

[0026] .

[0027] Further, according to the similarity comparison value and the correlation coefficient, the leakage fault state of the cable line for the aid to navigation light is determined, including:

[0028] When the similarity comparison value and the correlation coefficient are both greater than 0 and less than or equal to 1, and the similarity comparison value is greater than or equal to the correlation coefficient, there is an electric leakage fault in the cable line;

[0029] When the similarity comparison value and the correlation coefficient are both greater than 0 and less than or equal to 1, and the similarity comparison value is less than the correlation coefficient, there is an electric leakage fault in the cable line, and there is also an arc fault;

[0030] When the similarity comparison value and the correlation coefficient are both greater than or equal to -1 and less than 0, there is no ground type electric leakage fault in the cable line, and there is an insulation damage in the cable line;

[0031] When the similarity comparison value is 0 or no result, there is no electric leakage fault in the cable line; when the similarity comparison value is greater than 0 and less than or equal to 1 and the correlation coefficient is greater than or equal to -1 and less than 0, and when the similarity comparison value is greater than or equal to -1 and less than 0 and the correlation coefficient is greater than 0 and less than or equal to 1, there is no electric leakage fault in the cable line.

[0032] Further, according to the propagation speed of the detection signal in the cable core and the delay time, the distance of the electric leakage position point from the incident coil is determined, comprising:

[0033] Supposing that the propagation speed of the detection signal in the cable core is , the distance of the electric leakage position point from the incident coil is , , the delay time is

[0034] .

[0035] Further, the detection signal generation unit comprises a signal modulation unit, a cosine carrier unit and a signal synthesis unit; the output ends of the signal modulation unit and the cosine carrier unit are respectively connected with the input end of the signal synthesis unit; the output end of the signal synthesis unit is connected with the input end of the incident waveform delay unit.

[0036] The beneficial effects of the present application are: the present application can monitor the running state of the cable line buried underground in real time, and can quickly and accurately locate the electric leakage fault point position of the cable line, which helps to reduce the manual maintenance operation time and workload, and improves the operation and maintenance efficiency of the airport power supply system. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The principle diagram of the online diagnosis and positioning method of the electric leakage fault point of the airport navigation light line provided for the embodiment 1 of the present application;

[0038] Figure 2 The principle diagram of the online diagnosis and positioning system of the electric leakage fault point of the airport navigation light line provided for the embodiment 2 of the present application.

[0039] Icons: 1-Cable line; 2-Incident unit; 3-Acquisition unit; 4-Detection signal generation unit; 5-Reflected waveform processing unit; 6-Incident waveform delay unit; 7-Data processing unit. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Example 1

[0042] As an example, see the attached document. Figure 1 As shown, to solve the above-mentioned technical problems, this embodiment provides an online diagnosis and location method for leakage faults in airport navigation light circuits, including:

[0043] The detection signal is injected into the cable core through the incident ray coil;

[0044] The acquisition coil acquires the reflected signal of the detection signal in the cable line and calculates the similarity comparison value between the reflected signal and the delayed detection signal; the delayed detection signal is the detection signal corresponding to the delay time relative to the acquisition time when the reflected signal is acquired.

[0045] Calculate the covariance between the delayed detection signal and the reflected signal to obtain the correlation coefficient;

[0046] The leakage fault status of the cable line is determined based on the similarity comparison value and the correlation coefficient.

[0047] The distance between the leakage point and the incident coil is determined based on the propagation speed and delay time of the detection signal in the cable core.

[0048] Optionally, the detection signal is obtained by performing an AND operation between the cosine signal output by the cosine carrier unit and the chaotic sequence generated by the signal modulation unit.

[0049] Optionally, let the peak value of the cosine signal be... The waveform of the chaotic sequence is The period of the waveform of the chaotic sequence is The detection signal is , For frequency, For time, Indicates the period The number of persistent symbols present in the code. If the AND operation is performed, the detection signal is expressed as:

[0050] .

[0051] Optionally, the sampling frequency of the reflection signal is , the detection signal is , and the reflection signal is , is time, characterizes the distortion and attenuation coefficient of the reflection signal compared with the detection signal , and are constants, the reflection signal is expressed as:

[0052] .

[0053] In the present application, the collected reflection signal is directly used as a processing source, and the similarity calculation is performed between the reflection signal and the delayed detection signal with the delay time at the collection time, so that the similarity comparison value between the two groups of waveforms is obtained.

[0054] Optionally, the reflection signal is , the delayed detection signal is , is time, is the delay time, and the similarity comparison value is , is the period of the waveform of the chaotic sequence, and the similarity comparison value is:

[0055] .

[0056] The similarity comparison value performs the modulus value and inner product operations on the two groups of waveforms.

[0057] Optionally, the covariance of the delayed detection signal and the reflection signal is calculated to obtain the correlation coefficient, including: the detection signal is , the reflection signal is , is the delay time, and the correlation coefficient is , is the delayed detection signal, is the period of the waveform of the chaotic sequence, is the average value of the delayed detection signal , is the average value of the reflection signal , is the variance value of the delayed detection signal , is the variance value of the reflection signal , and the expression of the correlation coefficient is:

[0058] .

[0059] In practical application, the value range of the similarity comparison value and the value range of the correlation coefficient are both [-1, +1].

[0060] Optionally, the aviation light cable line electric leakage fault state is determined according to the similarity comparison value and the correlation coefficient, comprising:

[0061] When the similarity comparison value and the correlation coefficient are both greater than 0 and less than or equal to 1, and the similarity comparison value is greater than or equal to the correlation coefficient, there is an electric leakage fault in the cable line;

[0062] When the similarity comparison value and the correlation coefficient are both greater than 0 and less than or equal to 1, and the similarity comparison value is less than the correlation coefficient, there is an electric leakage fault in the cable line, and there is also an arc fault;

[0063] When the similarity comparison value and the correlation coefficient are both greater than or equal to -1 and less than 0, there is no ground type electric leakage fault in the cable line, and there is an insulation damage in the cable line;

[0064] When the similarity comparison value is 0 or no result, there is no electric leakage fault in the cable line; when the similarity comparison value is greater than 0 and less than or equal to 1 and the correlation coefficient is greater than or equal to -1 and less than 0, and when the similarity comparison value is greater than or equal to -1 and less than 0 and the correlation coefficient is greater than 0 and less than or equal to 1, there is no electric leakage fault in the cable line.

[0065] Optionally, the distance of the electric leakage position point from the incident coil is determined according to the propagation speed of the detection signal in the cable core and the delay time, comprising:

[0066] Let the propagation speed of the detection signal in the cable core be , the distance of the electric leakage position point from the incident coil be , , and the delay time be

[0067] .

[0068] Generally, , is the propagation speed of electromagnetic wave in vacuum.

[0069] According to the calculated distance of the electric leakage position point from the incident coil, the actual electric leakage position point is confirmed. If the value of the distance is consistent with the total length of the whole cable line, it means that the end part of the cable line has a branch, and only the change of the branch needs to be confirmed for verification; if the distance If the value of the cable line length is less than the total length of the whole cable line, it indicates that there is a leakage fault, and the leakage fault point is located.

[0070] The online diagnosis and positioning method for the leakage fault point of the airport aid-to-navigation light system cable line can monitor the operation state of the directly-buried cable line in real time, and can quickly and accurately locate the leakage fault point of the cable line, which helps to reduce the manual maintenance operation time and workload, and improves the operation and maintenance efficiency of the airport power supply system.

[0071] Embodiment 2

[0072] Based on the same principle as the method shown in Embodiment 1 of the present application, as shown in the accompanying drawings, Figure 2 The online diagnosis and positioning system for the leakage fault point of the airport aid-to-navigation light system cable line is also provided in the embodiments of the present application, which comprises a cable line 1, an incident unit 2, a collection unit 3, a detection signal generation unit 4, a reflected waveform processing unit 5, an incident waveform delay unit 6 and a data processing unit 7.

[0073] The incident unit 2 and the collection unit 3 are respectively sleeved on the cable line 1;

[0074] After the detection signal generation unit 4 generates the detection signal, the incident unit 2 injects the detection signal into the cable core of the cable line 1;

[0075] The collection unit 3 collects the reflected signal of the detection signal in the cable line; the reflected waveform processing unit 5 processes the reflected signal and outputs it to the data processing unit 7; the incident waveform delay unit 6 is used to output the delay detection signal to the data processing unit 7; the delay detection signal is the detection signal corresponding to the delay time relative to the collection time when the reflected signal is collected;

[0076] The data processing unit 7 calculates the similarity comparison value of the reflected signal and the delay detection signal, calculates the covariance of the delay detection signal and the reflected signal, obtains the correlation coefficient, and determines the leakage fault state of the cable line according to the similarity comparison value and the correlation coefficient, and determines the distance of the leakage position point from the incident coil according to the propagation speed of the detection signal in the cable core and the delay time.

[0077] In actual application process, the incident unit 2 and the collection unit 3 are both sleeved on the cable line 1 in a non-contact manner.

[0078] Optionally, the detection signal generation unit comprises a signal modulation unit, a cosine carrier unit and a signal synthesis unit; the output end of the signal modulation unit and the output end of the cosine carrier unit are respectively connected with the input end of the signal synthesis unit; the output end of the signal synthesis unit is connected with the input end of the incident waveform delay unit.

[0079] The data processing unit adopts ARM processing, and the ARM processor is combined with a cosine carrier unit to synthesize a detection signal. As an optional implementation, the detection signal is obtained by performing AND operation on a 5 MHz, 15 V peak value cosine signal output by the cosine carrier unit and a chaotic sequence output by the signal modulation unit.

[0080] In addition, the online diagnosis and positioning system for the leakage fault point of the airport navigation lamp circuit can also visually display the distance between the calculated leakage position point and the incident coil through the setting of the display unit.

[0081] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for online diagnosis and location of leakage faults in airport navigation light circuits, characterized in that, include: The detection signal is injected into the cable core through the incident ray coil; The acquisition coil collects the reflected signal of the detection signal in the cable line and calculates the similarity comparison value between the reflected signal and the delayed detection signal; the delayed detection signal is the detection signal corresponding to the delay time relative to the acquisition time when the reflected signal is acquired; let the reflected signal be... The delayed detection signal is , For time, The time delay is used to compare similarity values. , If the period of the waveform of the chaotic sequence is given, then the similarity comparison value is: ； Calculate the covariance between the delayed detection signal and the reflected signal to obtain the correlation coefficient, including: assuming the detection signal is... The reflected signal is , The time delay is given, and the correlation coefficient is given. , For delayed detection signals, Let be the period of the waveform of the chaotic sequence. For delayed detection signal The average value, For reflected signals The average value, For delayed detection signal The variance value, For reflected signals If the variance is given, then the expression for the correlation coefficient is: ； Based on similarity comparison values ​​and correlation coefficients, the leakage fault status of cable lines is determined, including: If both the similarity comparison value and the correlation coefficient are greater than 0 and less than or equal to 1, and the similarity comparison value is greater than or equal to the correlation coefficient, then there is a leakage fault in the cable line. When both the similarity comparison value and the correlation coefficient are greater than 0 and less than or equal to 1, and the similarity comparison value is less than the correlation coefficient, then there is a leakage fault and an arc fault in the cable line. When the similarity comparison value and the correlation coefficient are both greater than or equal to -1 and less than 0, there is no grounding leakage fault in the cable line, but there is insulation damage in the cable line. When the similarity comparison value is 0 or there is no result, there is no leakage fault in the cable line; when the similarity comparison value is greater than 0 and less than or equal to 1 and the correlation coefficient is greater than or equal to -1 and less than 0, and when the similarity comparison value is greater than or equal to -1 and less than 0 and the correlation coefficient is greater than 0 and less than or equal to 1, there is no leakage fault in the cable line. The distance between the leakage point and the incident coil is determined based on the propagation speed and delay time of the detection signal in the cable core.

2. The online diagnosis and location method for leakage faults in airport navigation light circuits according to claim 1, characterized in that, The detection signal is obtained by performing an AND operation between the cosine signal output by the cosine carrier unit and the chaotic sequence generated by the signal modulation unit.

3. The online diagnosis and location method for leakage faults in airport navigation light circuits according to claim 2, characterized in that, Let the peak value of the cosine signal be The waveform of the chaotic sequence is The period of the waveform of the chaotic sequence is The detection signal is , For frequency, For time, Indicates the period The number of persistent symbols present in the code. If we represent the AND operation, then the detected signal is represented as: 。 4. The online diagnosis and location method for leakage faults in airport navigation light circuits according to claim 1, characterized in that, Let the sampling frequency of the reflected signal be... The detection signal is The reflected signal is , For time, Characterizing the reflected signal compared to the detected signal The resulting distortion and attenuation coefficients, and If is a constant, then the reflected signal is expressed as: 。 5. The online diagnosis and location method for leakage faults in airport navigation light circuits according to claim 1, characterized in that, Based on the propagation speed and delay time of the detection signal in the cable core, the distance from the leakage point to the incident coil is determined, including: Let the propagation speed of the detection signal in the cable core be... The distance from the leakage point to the incident coil is , To account for the time delay, the distance from the leakage point to the incident coil is expressed as: 。 6. An online diagnosis and location system for leakage faults in airport navigation light circuits, characterized in that, It includes a cable line (1), an incident unit (2), an acquisition unit (3), a detection signal generation unit (4), a reflected waveform processing unit (5), an incident waveform delay unit (6), and a data processing unit (7). The incident unit (2) and the acquisition unit (3) are respectively mounted on the cable line (1); After the detection signal generation unit (4) generates the detection signal, the incident unit (2) injects the detection signal into the cable core of the cable line (1); The acquisition unit (3) acquires the reflected signal of the detection signal in the cable line; the reflected waveform processing unit (5) processes the reflected signal and outputs it to the data processing unit (7); the incident waveform delay unit (6) is used to output the delayed detection signal to the data processing unit (7); the delayed detection signal is the detection signal corresponding to the delay time relative to the acquisition time when the reflected signal is acquired; The data processing unit (7) calculates the similarity comparison value between the reflected signal and the delayed detection signal, calculates the covariance between the delayed detection signal and the reflected signal, obtains the correlation coefficient, and determines the leakage fault status of the cable line based on the similarity comparison value and the correlation coefficient, and determines the distance between the leakage location point and the incident coil based on the propagation speed and delay time of the detection signal in the cable core. Calculate the similarity comparison value between the reflected signal and the delayed detection signal, including: assuming the reflected signal is... The delayed detection signal is , For time, The time delay is used to compare similarity values. , If the period of the waveform of the chaotic sequence is given, then the similarity comparison value is: ； Calculate the covariance between the delayed detection signal and the reflected signal to obtain the correlation coefficient, including: assuming the detection signal is... The reflected signal is , The time delay is given, and the correlation coefficient is given. , For delayed detection signals, Let be the period of the waveform of the chaotic sequence. For delayed detection signal The average value, For reflected signals The average value, For delayed detection signal The variance value, For reflected signals If the variance is given, then the expression for the correlation coefficient is: ； Based on similarity comparison values ​​and correlation coefficients, the leakage fault status of cable lines is determined, including: If both the similarity comparison value and the correlation coefficient are greater than 0 and less than or equal to 1, and the similarity comparison value is greater than or equal to the correlation coefficient, then there is a leakage fault in the cable line. When both the similarity comparison value and the correlation coefficient are greater than 0 and less than or equal to 1, and the similarity comparison value is less than the correlation coefficient, then there is a leakage fault and an arc fault in the cable line. When the similarity comparison value and the correlation coefficient are both greater than or equal to -1 and less than 0, there is no grounding leakage fault in the cable line, but there is insulation damage in the cable line. When the similarity comparison value is 0 or there is no result, there is no leakage fault in the cable line; when the similarity comparison value is greater than 0 and less than or equal to 1 and the correlation coefficient is greater than or equal to -1 and less than 0, and when the similarity comparison value is greater than or equal to -1 and less than 0 and the correlation coefficient is greater than 0 and less than or equal to 1, there is no leakage fault in the cable line.

7. The online diagnosis and location system for leakage faults in airport navigation light circuits according to claim 6, characterized in that, The detection signal generation unit (4) includes a signal modulation unit, a cosine carrier unit and a signal synthesis unit; the output of the signal modulation unit and the output of the cosine carrier unit are respectively connected to the input of the signal synthesis unit; the output of the signal synthesis unit is connected to the input of the incident waveform delay unit (6).

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