CN115184252B - Pulse echo method-based vertical grounding electrode corrosion damage detection method and system - Google Patents
Pulse echo method-based vertical grounding electrode corrosion damage detection method and system Download PDFInfo
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Abstract
The invention belongs to the field of electric power detection, and discloses a method and a system for detecting corrosion damage of a vertical grounding electrode based on a pulse echo method, wherein the detection method 1) obtains the correlation between a pulse echo signal and a corrosion damage position according to the pulse echo signal; 2) Obtaining the correlation between the pulse echo signal and the corrosion damage section of the vertical grounding electrode, and analyzing and obtaining the attenuation degree of the pulse echo signal in the vertical grounding electrode by soil; 3) And fitting the relation of the attenuation component of the residual pulse echo signal and the cross section ratio of the corrosion damage of the vertical grounding electrode according to the attenuation degree of the pulse echo signal in the vertical grounding electrode by the soil, and obtaining the relation of the attenuation component of the pulse echo signal and the cross section ratio of the corrosion damage of the vertical grounding electrode caused by the corrosion damage of the vertical grounding electrode. The detection method can accurately detect the corrosion damage position and the corrosion degree of the vertical grounding electrode, can identify and detect the corrosion grounding electrode damage degree without excavation, and is convenient for early diagnosis before the occurrence of the grounding fault.
Description
Technical Field
The invention belongs to the technical field of damage detection, and particularly relates to a method and a system for detecting corrosion damage of a vertical grounding electrode based on a pulse echo method.
Background
The electrical grounding system is an important component of a substation. The protection device has the functions of protecting control equipment from being damaged and ensuring personal safety under the conditions of fault current, lightning stroke and the like. In a decades-old aging substation, the grounding grid is prone to failure. Once the grounding grid fails, huge economic losses are caused.
Therefore, checking and monitoring the integrity of the grounding system is one of the important measures for facility maintenance, helping to predict the service life of the grounding system. Currently, the most common detection method is direct excavation, but the cost is high and the time consumption is long. In addition, a resistance method, an electromagnetic field method and an electrochemical method are adopted, the resistance method has limited capability of identifying point defects in a system, such as corrosion of a grounding electrode, uncertainty exists, and meanwhile, the field test by using a ground resistance tester is labor-intensive work and is difficult to carry out the field test; the detection method based on the electromagnetic field has the problems that the tiny changes of resistance and voltage are difficult to realize accurate measurement due to the damage of the electrode, and the influence of the change of soil conditions and the interference of environmental signals is difficult to eliminate; while the electrochemical-based method cannot determine where the grounding device has corrosion damage and the status of the individual ground rods.
Therefore, there remain significant technical and economic challenges to field evaluation of ground integrity using effective diagnostic equipment and solutions.
Disclosure of Invention
The invention provides a method and a system for detecting corrosion damage of a vertical grounding electrode based on a pulse echo method, wherein the position of the corrosion damage is determined through the wave velocity of pulse echo and the propagation time of the vertical grounding electrode, and meanwhile, the cross section ratio relation between attenuation components of residual pulse echo signals and the corrosion damage of the vertical grounding electrode is fitted according to the correlation between the pulse echo signals and the corrosion damage cross section, so that the detection of the corrosion damage position and the corrosion degree of the vertical grounding electrode is accurately realized.
The invention is realized by the following technical scheme:
a vertical grounding electrode corrosion damage detection method based on a pulse echo method comprises the following steps:
1) Obtaining the correlation between the pulse echo signal and a corrosion damage position according to the pulse echo signal;
2) Obtaining the correlation between the pulse echo signal and a corrosion damage section according to the pulse echo signal, and analyzing and obtaining the attenuation degree of the soil to the pulse echo signal in the vertical grounding electrode according to the correlation between the pulse echo signal and the corrosion damage section;
3) According to the attenuation degree of the soil to the pulse echo signals in the vertical grounding electrode, eliminating the attenuation component of the pulse echo signals caused by the soil, fitting the relation between the attenuation component of the residual pulse echo signals and the cross section ratio of the corrosion damage of the vertical grounding electrode, obtaining the relation between the attenuation component of the pulse echo signals and the cross section ratio of the corrosion damage of the vertical grounding electrode caused by the corrosion damage of the vertical grounding electrode, and completing the detection of the corrosion damage degree of the vertical grounding electrode.
Optionally, in the step 1), a specific operation method for obtaining the correlation between the pulse echo signal and the corrosion damage position according to the pulse echo signal is as follows: and determining the corrosion damage position of the vertical grounding electrode according to the wave speed of the pulse echo and the propagation time of the pulse echo in the vertical grounding electrode.
Optionally, the method for determining the corrosion damage position of the vertical grounding electrode according to the wave speed of the pulse echo and the propagation time of the pulse echo in the vertical grounding electrode is as follows:
wherein, T represents the propagation time of the pulse echo recorded in the experiment in the vertical grounding electrode, v represents the propagation speed of the pulse echo in the vertical grounding electrode, L represents the distance between the pulse echo signal transmitter and the pulse echo signal receiver, and d represents the distance between the corrosion damage position of the vertical grounding electrode and the pulse echo receiver.
Optionally, in step 2), analyzing and obtaining the attenuation degree of the pulse echo signal in the vertical grounding electrode by the soil, specifically, using clay to replace the soil environment, and measuring the attenuation degree of the pulse echo signal in the vertical grounding electrode with different damages in the soil environment, so that the attenuation component of the pulse echo signal caused by the soil is as follows:
wherein, F 1 Representing the attenuation component of the pulse echo signal caused by soil, H representing the distance from the location of the erosion damage to the ground,
and
the amplitudes of the reflected pulse echo signals of the clay-free rod and the clay-containing rod are respectively.
Optionally, in step 3), the vertical grounding electrode corrosion damage causes the attenuation component F of the pulse echo signal 2 Comprises the following steps:
wherein, F 2 The attenuation component of the pulse echo signal caused by corrosion damage of the vertical grounding electrode is shown in the specification, and F is the total attenuation quantity of the pulse echo signal.
Optionally, in step 3), fitting attenuation component F of vertical grounding electrode corrosion damage pulse echo signal 2 The section ratio R of the corrosion damage of the vertical grounding electrode is related as follows:
wherein, F 2 The attenuation quantity of a pulse echo signal caused by corrosion damage of the vertical grounding electrode is shown as e, and R is the corrosion loss sectional area ratio.
Optionally, the method for calculating the total attenuation F of the pulse echo signal includes:
wherein S is 0 Sending out a pulse signal amplitude, S, for a pulse echo signal transmitter 1 The amplitude of the pulse signal received by the pulse echo signal receiver after the reflection of the corrosion damage.
Optionally, the distance H from the corrosion damage position to the ground is calculated by:
wherein, M represents the distance between the pulse echo signal receiver and the ground, L represents the distance between the pulse echo signal transmitter and the pulse echo signal receiver, and d represents the distance between the corrosion damage position of the vertical grounding electrode and the pulse echo receiver.
Alternatively,
and
in the amplitude values of the reflected pulse echo signals with the clay bar and the clay bar, the clay bar is a wet clay wrapping bar, and the soil corrosion damage around the vertical grounding electrode is detected by adopting the wet clay wrapping bar.
The technical scheme also provides a vertical grounding electrode corrosion damage detection system based on the pulse echo method, and the vertical grounding electrode corrosion damage detection system based on the pulse echo method is obtained by applying the vertical grounding electrode corrosion damage detection method based on the pulse echo method to the vertical grounding electrode corrosion damage detection.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1) The technical scheme is that the vertical grounding electrode corrosion damage detection method based on the pulse echo method is applied to detecting the vertical grounding electrode corrosion damage of the grounding system, under the condition that the attenuation effect of soil on pulse echoes is considered, the detection of the corrosion damage position and the corrosion damage degree of the vertical grounding electrode is realized at the same time, and the detection accuracy is high.
2) The position of corrosion damage can be determined through the wave speed of the pulse echo and the propagation time of the vertical grounding electrode, meanwhile, the relation between the attenuation component of the pulse echo signal and the corrosion sectional area ratio caused by the corrosion damage of the vertical grounding electrode can be fitted according to the correlation between the pulse echo signal and the corrosion damage cross section of the grounding electrode, the corrosion damage position and the corrosion degree can be accurately detected, the whole detection method is innovative, the cost is low, and the identification of excavation and the corrosion grounding electrode damage degree monitoring are not needed.
3) In the soil environment, the local corrosion degree of the grounding electrode can be determined according to the fitting function, so that the state of the grounding electrode can be known in time, and the early diagnosis of the grounding electrode before grounding faults such as corrosion damage of the grounding electrode occur is facilitated.
Drawings
FIG. 1 is a block diagram illustrating the flow structure of the present invention;
FIG. 2 is a diagram showing the relationship between the corrosion damage cross-section ratio R of the vertical grounding electrode and the amplitude of the pulse echo signal;
FIG. 3 shows the signal attenuation component F of the pulse echo signal in the vertical grounding electrode caused by different grounding electrode soil burying lengths and soil in the invention 1 A relationship diagram of (1);
FIG. 4 is a graph showing the relationship between the corrosion damage cross-section ratio of the vertical ground electrode and the amplitude of the echo signal according to the present invention;
FIG. 5 shows the attenuation component F of the vertical grounding electrode corrosion damage pulse echo signal in the present invention 2 A cross section ratio R relation graph of the corrosion damage of the vertical grounding electrode;
fig. 6 is a schematic diagram of the working mechanism of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1:
as shown in fig. 1, a method for detecting corrosion damage of a vertical grounding electrode based on a pulse echo method includes the following steps:
1) Obtaining the correlation between the pulse echo signal and a corrosion damage position according to the pulse echo signal;
in the step 1), a specific operation method for obtaining the correlation between the pulse echo signal and the corrosion damage position according to the pulse echo signal is as follows: and determining the corrosion damage position of the vertical grounding electrode according to the wave speed of the pulse echo and the propagation time of the pulse echo in the vertical grounding electrode.
The method for determining the corrosion damage position of the vertical grounding electrode according to the wave speed of the pulse echo and the propagation time of the pulse echo in the vertical grounding electrode comprises the following steps:
wherein, T represents the propagation time of the pulse echo recorded in the experiment in the vertical grounding electrode, v represents the propagation speed of the pulse echo in the vertical grounding electrode, L represents the distance between the pulse echo signal transmitter and the pulse echo signal receiver, and d represents the distance between the corrosion damage position of the vertical grounding electrode and the pulse echo receiver.
The signal received by detecting a defect 4m away from the signal emitter is shown in fig. 2, and it can be obtained from fig. 2 that the propagation time of the pulse wave in the earth electrode is T =1.24ms, and the distance between the two probes is T =1.24ms during detectionL=0.1m, the wave speed of the pulse wave is 3150m/s; so that the distance between the emitter and the position of the defect can be obtainedd=4.006m, error is only 0.15%.
2) Obtaining the correlation between the pulse echo signal and a corrosion damage section according to the pulse echo signal, and analyzing and obtaining the attenuation degree of the soil to the pulse echo signal in the vertical grounding electrode according to the correlation between the pulse echo signal and the corrosion damage section;
specifically, in step 2), analyzing and obtaining a signal attenuation relation of the pulse echo signal in the vertical grounding electrode, specifically, using clay to replace a soil environment, measuring attenuation degrees of the pulse echo signal in the vertical grounding electrode with different damages in the soil environment, analyzing and obtaining that the soil hardly affects the pulse echo signal in the vertical grounding electrode without corrosion damage, and the part of the vertical grounding electrode which is corroded and damaged has a large attenuation effect on the pulse echo signal, wherein a signal attenuation component of the pulse echo signal in the vertical grounding electrode caused by the soil is as follows:
wherein, F 1 Represents the attenuation component of the pulse echo signal caused by soil, H represents the distance from the position of the corrosion damage to the ground,
and
the amplitudes of the reflected pulse echo signals of the clay rod and the clay rod are not included respectively.
The working principle of the pulse echo method for detecting the corrosion damage of the vertical grounding electrode is shown in fig. 5, and the pulse echo method comprises two pulse echo signal transmitters and two pulse echo signal receivers, and consists of an aluminum coupler and a disc piezoelectric transducer arranged on the surface of the aluminum coupler.
3) According to the attenuation degree of the soil to the pulse echo signals in the vertical grounding electrode, eliminating the attenuation component of the pulse echo signals caused by the soil, fitting the relation between the attenuation component of the residual pulse echo signals and the cross section ratio of the corrosion damage of the vertical grounding electrode, obtaining the relation between the attenuation component of the pulse echo signals and the cross section ratio of the corrosion damage of the vertical grounding electrode caused by the corrosion damage of the vertical grounding electrode, and completing the detection of the corrosion damage degree of the vertical grounding electrode.
Specifically, in the step 3), the corrosion damage of the vertical grounding electrode causes the attenuation component F of the pulse echo signal 2 Comprises the following steps:
wherein, F 2 The attenuation component of the pulse echo signal caused by corrosion damage of the vertical grounding electrode is shown in the specification, and F is the total attenuation quantity of the pulse echo signal.
Specifically, in the step 3), fitting attenuation component F of corrosion damage pulse echo signal of vertical grounding electrode 2 The section ratio R of the corrosion damage of the vertical grounding electrode is related as follows:
wherein, F 2 The attenuation quantity of a pulse echo signal caused by corrosion damage of the vertical grounding electrode is shown as e, and R is the corrosion loss sectional area ratio.
The method for calculating the total attenuation F of the pulse echo signal comprises the following steps:
wherein S is 0 Sending out a pulse signal amplitude, S, for a pulse echo signal emitter 1 The amplitude of the pulse signal received by the pulse echo signal receiver after being reflected by the corrosion damage.
The calculation method of the distance H from the corrosion damage position to the ground comprises the following steps:
wherein, M represents the distance between the pulse echo signal receiver and the ground, L represents the distance between the pulse echo signal transmitter and the pulse echo signal receiver, and d represents the distance between the corrosion damage position of the vertical grounding electrode and the pulse echo receiver.
By detecting the burying degree of the soil of 14 groups of different grounding electrodes, the burying degree of the soil of 14 groups of different vertical grounding electrodes is 0cm,20cm,40cm,60cm,80cm,100cm,120cm,140cm,160cm,180cm,200cm and 220cm240cm and 260cm, namely adding one group for every 20cm of soil, and respectively obtaining the amplitude S of each group of pulse echo signals r And the signal amplitude S emitted by the signal generator 0 And the amplitude S of the signal received by the receiver 1 Calculating the total attenuation F of the pulse echo signal according to the formula (5), and respectively obtaining the attenuation F of the pulse signal caused by the soil according to the formulas (2) and (3) 1 The attenuation component F of the pulse echo signal caused by the corrosion damage of the vertical grounding electrode 2 And obtaining the corrosion damage section ratio R of the vertical grounding electrode according to the formula (4). FIG. 2 is a graph showing the relationship between the corrosion damage cross-section ratio R of the vertical ground electrode and the amplitude of the pulse echo signal; as shown in FIG. 3, the signal attenuation component F of the pulse echo signal in the vertical grounding electrode is different for different grounding electrode soil burying lengths and soil caused by the pulse echo signal 1 The relationship of (1); as shown in FIG. 4, for the relationship between the corrosion damage cross section ratio of the vertical grounding electrode and the amplitude of the echo signal, the attenuation component F of the corrosion damage pulse echo signal of the vertical grounding electrode is finally obtained by Matlab fitting 2 The section ratio R with respect to the corrosion damage of the vertical ground is shown in FIG. 5.
According to the technical scheme of the embodiment, a pulse echo method is adopted, and the corrosion damage position of the vertical grounding electrode is accurately determined according to the wave speed of pulse echo and the propagation time of the pulse echo in the vertical grounding electrode; and according to the correlation between the pulse echo signal and the corrosion damage section of the grounding electrode, fitting to obtain the relation between the attenuation component of the pulse echo signal caused by the corrosion damage of the vertical grounding electrode and the corrosion damage section ratio of the grounding electrode, thereby determining the corrosion damage degree of the grounding electrode and improving the detection accuracy of the corrosion damage position and the corrosion damage degree of the grounding electrode.
The whole detection process eliminates the influence of soil on pulse echo signals, excavation is not needed, the whole detection cost is reduced, and the accuracy is greatly improved.
The method for detecting corrosion damage to the vertical grounding electrode based on the pulse echo method can be applied to other electrical grounding systems, can quickly and effectively detect and diagnose when a grounding grid fails, and has an early diagnosis effect on electrical grounding devices including the grounding electrode.
Example 2:
the embodiment provides a system for detecting corrosion damage of a vertical grounding electrode based on a pulse echo method, and specifically applies the method for detecting corrosion damage of a vertical grounding electrode based on a pulse echo method described in embodiment 1 to the detection of corrosion damage of a vertical grounding electrode.
The vertical grounding electrode damage detection system comprises a PSPL2600C pulse echo signal generator, a TBS100C oscilloscope, a STEMiNC PZT transducer, a piezoelectric ceramic disc 15mmx2.1mm, an Olympus SWC-2 coupling agent and an ATA-304 power amplifier.
Wherein the pulse-echo signal generator emits a burst 5-cycle sinusoidal signal with a peak value of 10 volts and a frequency of 55 kHz for energizing the pulse-echo transmitter to generate a pulse wave in the vertical earth. The pulse echo receiver captures the pulse wave in the grounding electrode, the pulse wave is amplified through an amplifier, the gain is 40db, and finally a TBS100C oscilloscope is used for recording data.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A vertical grounding electrode corrosion damage detection method based on a pulse echo method is characterized by comprising the following steps: the method comprises the following steps:
1) Obtaining the correlation between the pulse echo signal and a corrosion damage position according to the pulse echo signal;
2) Obtaining the correlation between the pulse echo signal and a corrosion damage section according to the pulse echo signal, and analyzing and obtaining the attenuation degree of the soil to the pulse echo signal in the vertical grounding electrode according to the correlation between the pulse echo signal and the corrosion damage section;
3) According to the attenuation degree of the soil to the pulse echo signals in the vertical grounding electrode, eliminating the attenuation component of the pulse echo signals caused by the soil, fitting the relation between the attenuation component of the residual pulse echo signals and the cross section ratio of the corrosion damage of the vertical grounding electrode, obtaining the relation between the attenuation component of the pulse echo signals and the cross section ratio of the corrosion damage of the vertical grounding electrode caused by the corrosion damage of the vertical grounding electrode, and completing the detection of the corrosion damage degree of the vertical grounding electrode;
in step 2), analyzing and obtaining the attenuation degree of the soil to the pulse echo signal in the vertical grounding electrode, specifically, using clay to replace the soil environment, and measuring the attenuation degree of the pulse echo signal in the vertical grounding electrode with different damages in the soil environment, so that the attenuation component of the pulse echo signal caused by the soil is as follows:
wherein, F 1 Representing the attenuation component of the pulse echo signal caused by the soil, H representing the distance from the corrosion damage location to the ground,
and
the amplitudes of the reflected pulse echo signals of the clay-free rod and the clay-containing rod are respectively;
in the step 3), the vertical grounding electrode corrosion damage causes the attenuation component F of the pulse echo signal 2 Comprises the following steps:
wherein, F 2 The attenuation component of the pulse echo signal caused by corrosion damage of the vertical grounding electrode is shown, and F is the total attenuation quantity of the pulse echo signal;
in the step 3), fitting attenuation component F of corrosion damage pulse echo signal of vertical grounding electrode 2 Corrosion with vertical groundingThe section ratio R of the corrosion damage is as follows:
wherein, F 2 The attenuation quantity of a pulse echo signal caused by corrosion damage of the vertical grounding electrode is shown, e is a constant, and R is the corrosion loss sectional area ratio;
the method for calculating the total attenuation F of the pulse echo signal comprises the following steps:
wherein S is 0 Sending out a pulse signal amplitude, S, for a pulse echo signal transmitter 1 The amplitude of the pulse signal received by the pulse echo signal receiver after being reflected by the corrosion damage;
the calculation method of the distance H from the corrosion damage position to the ground comprises the following steps:
wherein, M represents the distance between the pulse echo signal receiver and the ground, L represents the distance between the pulse echo signal transmitter and the pulse echo signal receiver, and d represents the distance between the corrosion damage position of the vertical grounding electrode and the pulse echo receiver.
2. The pulse echo method-based vertical grounding electrode corrosion damage detection method according to claim 1, characterized in that: in the step 1), a specific operation method for obtaining the correlation between the pulse echo signal and the corrosion damage position according to the pulse echo signal is as follows: and determining the corrosion damage position of the vertical grounding electrode according to the wave speed of the pulse echo and the propagation time of the pulse echo in the vertical grounding electrode.
3. The pulse echo method-based vertical grounding electrode corrosion damage detection method according to claim 2, characterized in that: the method for determining the corrosion damage position of the vertical grounding electrode according to the wave velocity of the pulse echo and the propagation time of the pulse echo in the vertical grounding electrode comprises the following steps:
wherein, T represents the propagation time of the pulse echo in the vertical grounding electrode recorded in the experiment, v represents the propagation speed of the pulse echo in the vertical grounding electrode, L represents the distance between the pulse echo signal transmitter and the pulse echo signal receiver, and d represents the distance between the corrosion damage position of the vertical grounding electrode and the pulse echo receiver.
4. The pulse echo method-based vertical grounding electrode corrosion damage detection method according to claim 1, characterized in that:
and
in the amplitudes of the reflected pulse echo signals which are respectively a clay rod and a clay rod, the clay rod is a wet clay wrapping rod, and the corrosion damage of the vertical grounding electrode is detected by adopting the wet clay wrapping rod.
5. The utility model provides a vertical earth electrode corrosion damage detecting system based on pulse echo method which characterized in that: the method for detecting the corrosion damage of the vertical grounding electrode based on the pulse echo method is applied to the detection of the corrosion damage of the vertical grounding electrode.
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