A method and device for detecting leakage corrosion

Abstract

The present invention discloses a leakage corrosion detection method and device. The leakage corrosion detection method is used to detect the support parts of power generation equipment, and the method includes: obtaining the critical corrosion potential of the support part to be detected for leakage corrosion, recorded as the first potential; detecting the actual potential of the support part to be detected corresponding to the power generation equipment, recorded as the second potential; judging whether the support part to be detected is corroded according to the second potential and the first potential of the support part to be detected, if the second potential is greater than the first potential, corrosion occurs; otherwise, no corrosion occurs. The critical corrosion potential of the support part to be detected for leakage corrosion is determined by the leakage corrosion test, and combined with the actual potential of the support part to be detected in the application scenario to judge whether the support part to be detected is corroded, so that the leakage corrosion detection can be quantified, the accuracy of the leakage corrosion detection can be improved, and relevant personnel can be assisted to timely discover the leakage corrosion of the support part to avoid affecting the normal use of the power generation equipment.

Description

Technical Field

[0001] The invention relates to the technical field of power generation equipment, and in particular to a leakage corrosion detection method and device. Background Art

[0002] Rods are an important part of power generation equipment, mainly used to support and carry power generation equipment such as photovoltaic modules and floating bodies. Rods are usually made of metal and are prone to corrosion, especially when the power generation equipment is not adequately grounded, resulting in residual charge, which is prone to leakage corrosion.

[0003] However, existing leakage corrosion detection methods mostly rely on manual judgment based on experience, which has low detection efficiency and poor detection accuracy, and requires a lot of manpower and time costs. Summary of the invention

[0004] The present invention provides a leakage corrosion detection method and device, so as to detect whether leakage corrosion occurs on a rod and improve the detection efficiency and accuracy.

[0005] According to one aspect of the present invention, a leakage corrosion detection method is provided, which is used to detect a support member of a power generation device, and the method comprises:

[0006] Obtaining a critical corrosion potential at which leakage corrosion occurs on the support member to be detected, recorded as a first potential;

[0007] Detecting the actual potential of the support member to be detected corresponding to the power generation equipment, and recording it as the second potential;

[0008] Whether the support member to be detected is corroded is determined according to the second potential and the first potential of the support member to be detected; if the second potential of the support member to be detected is greater than the first potential, the support member to be detected is corroded; otherwise, the support member to be detected is not corroded.

[0009] Optionally, before obtaining the critical corrosion potential of the support member to be tested for leakage corrosion, the method further includes: performing a leakage corrosion test on the support member to be tested for testing to obtain the first potential, including:

[0010] Dividing the support member to be detected into a plurality of preset measurement areas, and applying power excitation to the support member to be detected;

[0011] Measure the leakage current and leakage potential of each preset measurement area;

[0012] A leakage current and leakage potential correspondence curve is drawn according to the leakage current and leakage potential of all preset measurement areas; and the first potential of the support member to be detected is determined according to the correspondence curve.

[0013] Optionally, determining the first potential of the support member to be detected according to the corresponding relationship curve includes:

[0014] The leakage potential between the occurrence of leakage corrosion and the non-occurrence of leakage corrosion in the corresponding relationship curve is used as the first potential.

[0015] Optionally, applying power supply excitation to the support member to be detected; and measuring the leakage current and leakage potential of each preset measurement area include:

[0016] Apply power excitation to one end of the support member to be tested; after the excitation, starting from the preset measurement area close to the power excitation end, measure the leakage current and leakage potential of all preset measurement areas in sequence and record them.

[0017] Optionally, after the support member to be inspected is corroded, the method further includes detecting a corrosion rate of the support member to be inspected.

[0018] Optionally, the detecting the corrosion rate of the support member to be detected includes:

[0019] Acquiring the distance between the power generation device and the support member to be detected, the second potential of the support member to be detected, and the electrical parameters of the support member to be detected;

[0020] The corrosion rate of the support member to be detected is determined according to the distance between the power generation device and the support member to be detected, the second potential of the support member to be detected and the electrical parameters of the support member to be detected.

[0021] Optionally, the electrical parameters of the support member to be detected include at least one of: corrosion coefficient, equivalent atomic weight of the support member to be detected, density, Faraday constant and number of lost electrons.

[0022] Optionally, the corrosion of the support member to be detected includes surface coating corrosion and internal substrate corrosion;

[0023] When the surface coating of the support member to be detected is corroded, the distance between the power generation device and the support member to be detected is the distance between the power generation device and the surface coating, and the electrical parameters of the support member to be detected are the electrical parameters of the surface coating;

[0024] When the inner substrate of the support member to be detected is corroded, the distance between the power generation device and the support member to be detected is the distance between the power generation device and the inner substrate, and the electrical parameters of the support member to be detected are the electrical parameters of the inner substrate.

[0025] Optionally, the support member to be detected is a rod of a photovoltaic assembly, which is used to support the photovoltaic assembly.

[0026] Optionally, the first potential is the potential of the support member to be detected, or the potential difference between the support member to be detected and the power generation equipment;

[0027] The second potential is the potential of the support member to be detected, or the potential difference between the support member to be detected and the power generation equipment.

[0028] Optionally, the performing of a leakage corrosion test on the test support member to be tested further comprises:

[0029] A water pump is used to supply dielectric liquid to a water spray pipe, and the dielectric liquid is sprayed to the power generation equipment disposed in a water tank through the water spray pipe, so that when power excitation is applied, the support member to be detected, the power generation equipment and the power supply form an excitation detection circuit to detect the first potential.

[0030] Optionally, the performing of a leakage corrosion test on the test support member to be tested further comprises:

[0031] By adjusting the height of the support structure, the spacing between the test support member to be tested and the test power generation equipment is adjusted to obtain multiple groups of test spacings and corresponding first potentials obtained by the leakage corrosion test;

[0032] The spacing between the power generation equipment and the support member to be detected in the application scenario is obtained, and matched with multiple groups of test spacings, and the first potential obtained from the leakage corrosion test corresponding to the successfully matched test spacing is compared with the actual potential of the support member to be detected in the application scenario to determine whether the support member to be detected is corroded.

[0033] According to another aspect of the present invention, there is provided a leakage corrosion detection device, which is used to perform a leakage corrosion test on a support member to be tested for testing, and the device comprises: the support member to be tested, a power generation device and a power supply;

[0034] The support member to be detected, the power generation device and the power supply form an excitation detection circuit to detect a first potential.

[0035] Optionally, the leakage corrosion detection device also includes a water spray pipe, a water tank, a supporting structure and a water pump; the support member to be detected is placed in the water tank and is arranged parallel to the power generation equipment at a preset distance; the supporting structure is fixedly arranged in the water tank to support the power generation equipment; the water pump is used to provide the medium liquid to the water spray pipe; the water spray pipe is arranged above the power generation equipment.

[0036] Optionally, the supporting structure is a telescopic structural component.

[0037] The technical solution of the embodiment of the present invention provides a leakage corrosion detection method and device, the leakage corrosion detection method is used to detect the support of the power generation equipment, the method includes: obtaining the critical corrosion potential of the support to be detected for leakage corrosion, recorded as the first potential; detecting the actual potential of the support to be detected corresponding to the power generation equipment, recorded as the second potential; judging whether the support to be detected is corroded according to the second potential and the first potential of the support to be detected; if the second potential of the support to be detected is greater than the first potential, the support to be detected is corroded; otherwise, the support to be detected is not corroded. The method can be realized by: determining the critical corrosion potential of the support to be detected for leakage corrosion through the leakage corrosion test, and judging whether the support to be detected is corroded in combination with the actual potential of the support to be detected, so as to quantify the leakage corrosion detection, thereby improving the accuracy of the leakage corrosion detection, assisting relevant personnel to timely discover the leakage corrosion of the support, facilitating timely corresponding treatment, and avoiding affecting the normal use of the power generation equipment.

[0038] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a flow chart of a leakage corrosion detection method provided in an embodiment of the present invention;

[0041] Figure 2 is a flow chart of another leakage corrosion detection method provided in an embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of a corresponding relationship curve between leakage current and leakage potential provided in an embodiment of the present invention;

[0043] Figure 4 It is a structural schematic diagram of dividing the measurement area of ​​a support member to be detected provided in an embodiment of the present invention;

[0044] Figure 5 is a flow chart of another vulnerability corrosion detection method provided in an embodiment of the present invention;

[0045] Figure 6is a flow chart of another vulnerability corrosion detection method provided in an embodiment of the present invention;

[0046] Figure 7 is a cross-sectional schematic diagram of a support member to be detected provided in an embodiment of the present invention;

[0047] Figure 8 It is a structural schematic diagram of a leakage corrosion detection device provided by an embodiment of the present invention;

[0048] Fig. 9 is a structural schematic diagram of a support structure provided in an embodiment of the present invention;

[0049] Fig.10 It is a structural schematic diagram of another supporting structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] Figure 1 A flow chart of a leakage corrosion detection method is provided in an embodiment of the present invention. This embodiment can be applied to detecting whether leakage corrosion occurs in a supporting member of a power generation device. The method can be performed by a leakage corrosion detection device. Figure 1 , specifically including the following steps:

[0053] Step 110: obtaining a critical corrosion potential at which leakage corrosion of the support member to be detected occurs, recorded as a first potential.

[0054] Wherein, the support member to be tested is used to support and carry power generation equipment. Wherein, the power generation equipment can be a photovoltaic component, such as a photovoltaic panel of a water surface photovoltaic power station. Wherein, the critical corrosion potential of the support member to be tested for leakage corrosion refers to the critical corrosion potential of the support member to be tested for leakage corrosion under the leakage corrosion test. Wherein, the leakage corrosion test refers to simulating the leakage corrosion environment, and placing the support member to be tested in the leakage corrosion environment for testing. Wherein, the critical corrosion potential refers to the leakage when the test support member to be tested just undergoes leakage corrosion, that is, the potential between leakage corrosion and no leakage corrosion.

[0055] Step 120 , detecting the actual potential of the support member to be detected corresponding to the power generation equipment, which is recorded as the second potential.

[0056] Among them, the actual potential of the support to be detected corresponding to the power generation equipment refers to the actual potential occurring in the application scenario. Among them, the application scenario refers to the actual application scenario in which the support to be detected is used to support and carry the power generation equipment. Among them, the power generation equipment will generate a certain charge on the surface after long-term use, and this part of the charge will be directly grounded through the wire. However, due to insufficient grounding during grounding, excess charge will remain on the surface of the power generation equipment, and these residual charges will be transferred to the support to be detected, so that a certain potential is generated between the support to be detected and the power generation equipment. Therefore, it is necessary to detect the actual potential of the support to be detected in the application scenario to further determine whether leakage corrosion occurs.

[0057] It should be noted that the support member to be tested in the test is the same type of support member as the support member to be tested in the actual application scenario. Its material, corrosion resistance, density and other properties are the same. Therefore, under the same leakage corrosion test, its critical corrosion potential is also the same.

[0058] Step 130, judging whether the support member to be detected is corroded according to the second potential and the first potential of the support member to be detected; if the second potential of the support member to be detected is greater than the first potential, the support member to be detected is corroded; otherwise, the support member to be detected is not corroded.

[0059] Among them, the support member to be tested is used to support and carry the power generation equipment. Once the support member to be tested is corroded, it will affect the installation state of the power generation equipment and further affect the normal operation of the power generation equipment.

[0060] Among them, the first potential is the critical corrosion potential of the test support member to be tested in the leakage corrosion test, which can be used to determine whether the support member to be tested is corroded. Therefore, according to the first potential and the second potential of the support member to be tested, it can be determined whether it is corroded. If the second potential is greater than the first potential, it means that the support member to be tested is corroded in the application scenario, otherwise, it means that the support member to be tested is not corroded in the application scenario. This is helpful to assist relevant personnel to find problems in time and make corresponding treatments to avoid affecting the normal use of power generation equipment.

[0061] In the technical solution of this embodiment, the working principle of the leakage corrosion detection method is: Figure 1 First, obtain the critical corrosion potential of the support to be detected for leakage corrosion, which is recorded as the first potential; then, detect the actual potential of the support to be detected corresponding to the power generation equipment, which is recorded as the second potential; finally, determine whether the support to be detected is corroded based on the second potential and the first potential of the support to be detected. If the second potential of the support to be detected is greater than the first potential, it means that the support to be detected is corroded; otherwise, it means that the support to be detected is not corroded. Therefore, the critical corrosion potential of the support to be detected can be accurately obtained through the leakage corrosion test, and combined with the actual potential of the support to be detected to determine whether the support to be detected is corroded so as to quantify the leakage corrosion detection, thereby improving the accuracy of the leakage corrosion detection, assisting relevant personnel to promptly discover the leakage corrosion of the support, and facilitating timely corresponding treatment to avoid affecting the normal use of the power generation equipment. Compared with the existing method of relying on manual experience inspection, it can shorten the detection cycle, reduce labor and time costs, and improve detection efficiency.

[0062] As an implementation method, Figure 2 is a flow chart of another leakage corrosion detection method provided in an embodiment of the present invention. Figure 2 , specifically including the following steps:

[0063] Step 210: divide the support member to be inspected into a plurality of preset measurement areas, and apply power excitation to the support member to be inspected.

[0064] The magnitude of the power supply excitation is an excitation voltage that makes the support member to be tested have two different states of parts where leakage corrosion occurs and parts where leakage corrosion does not occur. The specific value can be set according to actual conditions and is not specifically limited here.

[0065] The more the number of divisions of the preset measurement area is, the higher the accuracy of the critical corrosion potential of the support member to be detected is. It should be noted that the specific number of divisions of the preset measurement area can be set according to actual conditions and is not specifically limited here.

[0066] Step 220: Measure the leakage current and leakage potential of each preset measurement area.

[0067] Among them, under the same power supply excitation, the magnitude of the current and voltage flowing through different preset measurement areas of the support to be tested is different, and the leakage corrosion conditions are also different. Therefore, it is necessary to measure and record the leakage current and leakage potential of each preset measurement area, as well as whether the corresponding area has leakage corrosion, so as to subsequently determine the critical corrosion potential of the support to be tested.

[0068] It should be noted that the leakage current and leakage potential of each preset measurement area do not necessarily mean that leakage corrosion will occur in the area. For example, the current and potential can be detected in the area of ​​the test support far away from the power supply excitation, but no corrosion occurs.

[0069] Step 230 , drawing a leakage current and leakage potential correspondence curve according to the leakage current and leakage potential of all preset measurement areas; and determining the first potential of the support member to be detected according to the correspondence curve.

[0070] Among them, drawing the corresponding relationship curve between leakage current and leakage potential can visually observe the leakage corrosion situation of each preset measurement area. Among them, the leakage corrosion situation includes whether leakage corrosion occurs, the degree of leakage corrosion, etc.

[0071] A comparison table of leakage corrosion conditions and leakage potential and / or leakage current in each preset measurement area may also be provided so as to compare the leakage potential and / or leakage current on the corresponding relationship curve with the corrosion conditions in the corresponding area.

[0072] Step 240: Detect the actual potential of the support member to be detected corresponding to the power generation equipment, which is recorded as the second potential.

[0073] Step 250, judging whether the support member to be detected is corroded according to the second potential and the first potential of the support member to be detected; if the second potential of the support member to be detected is greater than the first potential, the support member to be detected is corroded; otherwise, the support member to be detected is not corroded.

[0074] Figure 3 is a schematic diagram of a leakage current and leakage potential correspondence curve provided in an embodiment of the present invention. Optionally, determining the first potential of the support member to be detected according to the correspondence curve includes:

[0075] The leakage potential between the occurrence of leakage corrosion and the occurrence of no leakage corrosion in the corresponding relationship curve is taken as the first potential.

[0076] For example Figure 3As shown, assuming that the support member to be tested does not corrode in the preset measurement area corresponding to the leakage potential of 0.1V, this potential is the critical corrosion potential of the support member to be tested.

[0077] Figure 4 The present invention provides a schematic diagram of a structure in which a support member to be detected is divided into measurement areas. Optionally, applying power excitation to the support member to be detected; measuring the leakage current and leakage potential of each preset measurement area, including:

[0078] Apply power excitation to one end of the support member to be tested; after the excitation, starting from the preset measurement area close to the power excitation end, measure the leakage current and leakage potential of all preset measurement areas in sequence and record them.

[0079] Among them, the support member to be detected is usually a long rod in the shape of a cuboid, a cylinder, etc., and the materials of its various parts are uniform and the same. The power excitation applied to the support member to be detected is usually applied from one end of the support member to be detected, and the excitation signal flows in the direction from close to the power application end to far away from the application end and gradually decays. Therefore, the voltage or current flowing through different areas of the support member to be detected is different, and the leakage corrosion conditions in the corresponding different areas are also different. For example, from close to the power application end to far away from the application end, the degree of corrosion of the support member to be detected gradually decreases until corrosion just does not occur at a certain place. Therefore, by applying power excitation at one end of the support member to be detected and detecting the leakage current and leakage potential of each preset measurement area, the critical corrosion potential of the support member to be detected for leakage corrosion can be determined.

[0080] In order to facilitate the determination of the critical corrosion potential of the support member to be tested for leakage corrosion, the support member to be tested is divided into multiple preset measurement areas according to its shape, size, etc. Figure 4 As shown, taking a cylindrical long rod as an example, 8 preset measurement areas are equally divided from left to right according to the length of the rod, and serial numbers are marked in sequence to facilitate recording of test data.

[0081] In the technical solution of this embodiment, the working principle of the leakage corrosion detection method is: Figures 2 to 4First, the support to be detected is divided into multiple preset measurement areas, and a power supply excitation is applied to the support to be detected; after the excitation, the leakage current and leakage potential of each preset measurement area are measured; then, the corresponding relationship curve between the leakage current and the leakage potential is drawn according to the leakage current and leakage potential of all preset measurement areas; and then the first potential of the support to be detected is determined according to the corresponding relationship curve. Secondly, the actual potential of the support to be detected corresponding to the power generation equipment is detected, which is recorded as the second potential; finally, whether the support to be detected is corroded is determined according to the second potential and the first potential of the support to be detected. If the second potential of the support to be detected is greater than the first potential, it means that the support to be detected is corroded; otherwise, it means that the support to be detected is not corroded. Therefore, this method can be implemented: by applying a power supply excitation to the support to be detected, detecting the leakage potential and leakage current of each preset measurement area on the support to be detected after the excitation, and determining the critical corrosion potential of the support to be detected according to the leakage potential and leakage current of each preset measurement area, the accuracy of determining the critical corrosion potential can be improved, which is conducive to further improving the accuracy of leakage corrosion detection of the support to be detected. Moreover, by combining the critical corrosion potential of leakage corrosion of the support member to be detected with the actual potential of the support member to be detected to determine whether corrosion has occurred in the support member to be detected, the leakage corrosion detection can be quantified, thereby improving the accuracy of leakage corrosion detection, assisting relevant personnel to promptly discover the leakage corrosion of the support member, facilitating timely corresponding treatment, and avoiding affecting the normal use of the power generation equipment.

[0082] As an implementation method, Figure 5 is a flow chart of another vulnerability corrosion detection method provided in an embodiment of the present invention. Figure 5 , specifically including the following steps:

[0083] Step 310: Obtain a critical corrosion potential at which leakage corrosion of the support member to be detected occurs, recorded as a first potential.

[0084] Step 320: Detect the actual potential of the support member to be detected corresponding to the power generation equipment, which is recorded as the second potential.

[0085] Step 330, judging whether the support member to be detected is corroded according to the second potential and the first potential of the support member to be detected; if the second potential of the support member to be detected is greater than the first potential, the support member to be detected is corroded; otherwise, the support member to be detected is not corroded.

[0086] Among them, the first potential is the critical corrosion potential of the support to be detected in the leakage corrosion test, and the second potential is the actual potential of the support to be detected. Since the support to be detected for the test is the same type of support as the support to be detected in the application scenario, and its corrosion resistance, material, etc. are the same, the critical corrosion potential of the support to be detected for the test can be used as a quantitative judgment standard for leakage corrosion, that is, the actual potential (second potential) of the support to be detected in the application scenario is compared with the critical corrosion potential (first potential) of the support to be detected for the test. If the second potential is greater than the first potential, it means that the support to be detected in the application scenario is corroded, otherwise, it means that the support to be detected in the application scenario is not corroded. In this way, it is possible to accurately judge the corrosion of the support to be detected in the application scenario.

[0087] Step 340: After the support member to be inspected is corroded, the corrosion rate of the support member to be inspected is detected.

[0088] Among them, after determining that the support to be detected is corroded, detecting the corrosion rate of the support to be detected can be used to further predict and discover the corrosion risk of the support to be detected, so as to facilitate timely improvement and avoid unnecessary losses. For example, if the corrosion rate is detected to be relatively fast, it means that the support to be detected has a great safety hazard in supporting the power generation equipment, and it is very likely that it can no longer support the power generation equipment, which will affect the normal use of the power generation equipment and may cause safety accidents. Therefore, it is necessary to make timely improvement measures such as repair and replacement.

[0089] In the technical solution of this embodiment, the working principle of the leakage corrosion detection method is: Figure 5First, obtain the critical corrosion potential of the support to be detected for leakage corrosion, which is recorded as the first potential; secondly, detect the actual potential of the support to be detected corresponding to the power generation equipment, which is recorded as the second potential; then, compare the second potential of the support to be detected with the first potential. If the second potential of the support to be detected is greater than the first potential, the support to be detected is corroded; otherwise, the support to be detected is not corroded. Finally, after determining that the support to be detected is corroded, detect the corrosion rate of the support to be detected. Therefore, this method can achieve: the critical corrosion potential of the support to be detected for the test can be accurately obtained through the leakage corrosion test, and combined with the actual potential of the support to be detected in the application scenario to determine whether the support to be detected is corroded to quantify the leakage corrosion detection, thereby improving the accuracy of the leakage corrosion detection, assisting relevant personnel to promptly discover the leakage corrosion of the support, and facilitating timely corresponding treatment to avoid affecting the normal use of the power generation equipment. After determining that the support member to be inspected has been corroded, further detecting the corrosion rate of the support member to be inspected can be used to further predict and discover the corrosion risk of the support member to be inspected, thereby facilitating timely improvement and avoiding unnecessary losses.

[0090] As an implementation method, Figure 6 is a flow chart of another vulnerability corrosion detection method provided in an embodiment of the present invention. Figure 6 , specifically including the following steps:

[0091] Step 410: Obtain a critical corrosion potential at which leakage corrosion of the support member to be detected occurs, which is recorded as a first potential.

[0092] Step 420: Detect the actual potential of the support member to be detected corresponding to the power generation equipment, which is recorded as the second potential.

[0093] Step 430, judging whether the support member to be detected is corroded according to the second potential and the first potential of the support member to be detected; if the second potential of the support member to be detected is greater than the first potential, the support member to be detected is corroded; otherwise, the support member to be detected is not corroded.

[0094] Step 440: After the support member to be detected is corroded, obtain the distance between the power generation device and the support member to be detected, the second potential of the support member to be detected, and the electrical parameters of the support member to be detected.

[0095] Among them, in the application scenario, the support member to be detected is used to support the power generation equipment. Usually, other supports, such as aluminum alloy washers, are arranged between the power generation equipment and the support member to be detected, so that there is a certain distance between the support member to be detected and the power generation equipment.

[0096] Wherein, optionally, the electrical parameters of the support to be detected may include: corrosion coefficient, equivalent atomic weight, density, Faraday constant and number of lost electrons of the support to be detected. Wherein, the corrosion coefficient, equivalent atomic weight, density, Faraday constant and number of lost electrons of the support to be detected are basic electrical parameters of the support to be detected, which can be directly obtained from the properties of the material and the like, and thus can be regarded as known parameters.

[0097] Step 450: Determine the corrosion rate of the support member to be detected according to the distance between the power generation equipment and the support member to be detected, the second potential of the support member to be detected, and the electrical parameters of the support member to be detected.

[0098] Among them, the calculation formula for the corrosion rate of the support to be tested is:

[0099]

[0100] Wherein, K is the corrosion coefficient; A is the equivalent atomic weight of the support to be detected; ρ is the density of the support to be detected; F is the Faraday constant; n is the number of electrons lost by the support to be detected; l is the distance between the support to be detected and the power generation equipment; V is the second potential; V L is the corrosion rate of the support to be tested.

[0101] The specific derivation process of the calculation formula of the corrosion rate of the support member to be tested is:

[0102]

[0103] Among them, V L is the corrosion rate of the support to be tested; ρ is the density of the support to be tested; ΔW is the amount of material dissolved by corrosion; S 腐蚀 is the surface area of ​​the corrosion area; t is the power-on time.

[0104] The calculation formula for the amount of material dissolved by corrosion is:

[0105]

[0106] According to Faraday's law, then:

[0107]

[0108] Since the dielectric resistance is:

[0109]

[0110] Combining Ohm's law, substituting equation (5) into equation (4), we can get:

[0111]

[0112] In the technical solution of this embodiment, the working principle of the leakage corrosion detection method is: Figure 6 First, the critical corrosion potential of the support to be detected for leakage corrosion is obtained, which is recorded as the first potential; secondly, the actual potential of the support to be detected corresponding to the power generation equipment is detected, which is recorded as the second potential. Then, the second potential is compared with the first potential. If the second potential of the support to be detected is greater than the first potential, the support to be detected is corroded; otherwise, the support to be detected is not corroded; finally, after determining that the support to be detected is corroded, the distance between the power generation equipment and the support to be detected, the second potential of the support to be detected, and the electrical parameters of the support to be detected are obtained, and the corrosion rate of the support to be detected is determined according to the distance between the power generation equipment and the support to be detected, the second potential of the support to be detected, and the electrical parameters of the support to be detected. Therefore, this method can achieve: through the leakage corrosion test, the critical corrosion potential of the support to be tested can be accurately obtained, and combined with the actual potential of the support to be tested in the application scenario, it can be judged whether the support to be tested is corroded to achieve the quantification of leakage corrosion detection, thereby improving the accuracy of leakage corrosion detection, assisting relevant personnel to timely discover the leakage corrosion of the support, facilitating timely corresponding treatment, and avoiding affecting the normal use of the power generation equipment. After judging that the support to be tested is corroded, the corrosion rate of the support to be tested can be accurately calculated according to the distance between the power generation equipment and the support to be tested, the second potential of the support to be tested, and the electrical parameters of the support to be tested, which can be used to further predict and discover the corrosion risk of the support to be tested, so as to facilitate timely improvement and avoid unnecessary losses.

[0113] As a specific implementation method, Figure 7 is a schematic cross-sectional view of a support member to be detected provided in an embodiment of the present invention. Optionally, the corrosion of the support member to be detected includes surface coating corrosion and internal substrate corrosion;

[0114] When the surface coating of the support to be detected is corroded, the distance between the power generation equipment and the support to be detected is the distance between the power generation equipment and the surface coating, and the electrical parameters of the support to be detected are the electrical parameters of the surface coating;

[0115] When the inner substrate of the support member to be detected is corroded, the distance between the power generation equipment and the support member to be detected is the distance between the power generation equipment and the inner substrate, and the electrical parameters of the support member to be detected are the electrical parameters of the inner substrate.

[0116] For example, the support to be tested is usually made of coated steel, whose mechanical properties and corrosion resistance can better meet the requirements of power generation equipment. Figure 7 The coated steel material is composed of a surface coating 11 and an internal substrate 12 (such as a steel substrate). The components of the surface coating are zinc, aluminum, magnesium, zinc, etc.

[0117] Among them, when the surface coating corrosion occurs on the support to be detected, the distance between the power generation equipment and the support to be detected is the distance between the power generation equipment and the surface coating, the equivalent atomic weight of the support to be detected is the equivalent atomic weight of the surface coating, the density of the support to be detected is the density of the surface coating, and the number of lost electrons of the support to be detected is the number of lost electrons of the surface coating.

[0118] When internal substrate corrosion occurs in the support to be detected, the distance between the power generation equipment and the support to be detected is the distance between the power generation equipment and the internal substrate, the equivalent atomic weight of the support to be detected is the equivalent atomic weight of the internal substrate, the density of the support to be detected is the density of the internal substrate, and the number of lost electrons of the support to be detected is the number of lost electrons of the internal substrate.

[0119] Optionally, the support member to be detected is a rod of a photovoltaic assembly, which is used to support the photovoltaic assembly.

[0120] Among them, the power generation equipment can be a photovoltaic module, a photovoltaic panel, etc., and the support member to be tested is a rod of the photovoltaic module, the photovoltaic panel, etc., which is used to support and carry the photovoltaic module or the photovoltaic panel, etc.

[0121] Optionally, the first potential is the potential of the support member to be detected, or the potential difference between the support member to be detected and the power generation equipment;

[0122] The second potential is the potential of the support member to be detected, or the potential difference between the support member to be detected and the power generation device.

[0123] Among them, in the technical solution of this embodiment, in addition to obtaining and comparing the potentials, the potential difference or voltage difference can also be obtained. The specific settings can be made according to actual conditions and are not specifically limited here.

[0124] Optionally, the leakage corrosion test is performed on the test support member to be tested, further comprising:

[0125] A water pump is used to supply dielectric liquid to a water spray pipe, and the dielectric liquid is sprayed to a power generation device disposed in a water tank through the water spray pipe, so that when power excitation is applied, the support member to be detected, the power generation device and the power supply form an excitation detection circuit to detect the first potential.

[0126] The dielectric liquid is a dielectric solution that causes the support to be detected to corrode under the excitation of the power supply. The water pump is connected to the water spray pipe, the water outlet of the water spray pipe is arranged above the power generation equipment, the support to be detected is arranged below the power generation equipment at a certain distance, and the power supply is connected to the power generation equipment and the support to be detected respectively. The water pump provides the dielectric liquid to the water spray pipe, so that the water spray pipe sprays the dielectric liquid to the power generation equipment, and the dielectric liquid sprays downward from the power generation equipment to the surface of the support to be detected. When the power supply excitation is applied, the support to be detected, the power generation equipment and the power supply form an excitation detection circuit, thereby detecting the first potential.

[0127] Optionally, the leakage corrosion test is performed on the test support member to be tested, further comprising:

[0128] By adjusting the height of the support structure, the spacing between the test support member to be tested and the test power generation equipment is adjusted to obtain multiple groups of test spacings and corresponding first potentials obtained by the leakage corrosion test;

[0129] The spacing between the power generation equipment and the support member to be detected in the application scenario is obtained, and matched with multiple groups of test spacings, and the first potential obtained from the leakage corrosion test corresponding to the successfully matched test spacing is compared with the actual potential of the support member to be detected in the application scenario to determine whether corrosion occurs to the support member to be detected.

[0130] Among them, by adjusting the height of the support structure, the distance between the test support to be detected and the test power generation equipment can be adjusted. Therefore, by changing the distance between the test support to be detected and the test power generation equipment, and subjecting the test support to be detected to a leakage corrosion test at each distance, the first potential at different distances can be obtained. Among them, the different distances used for the test can be used as standard control data. For example, the distance between the power generation equipment and the support to be detected in the application scenario obtained is matched with each distance used in the test, and the first potential corresponding to the successfully matched test distance data is compared with the second potential of the support to be detected in the application scenario to determine whether the support to be detected is corroded.

[0131] Among them, the spacing value or value range between the test support to be tested and the test power generation equipment is related to the commonly used or standard spacing in the actual application scenario, and can be set according to the actual situation, and no specific limitation is made here.

[0132] Figure 8 Schematic diagram of a leakage corrosion detection device provided by an embodiment of the present invention. The present invention provides a leakage corrosion detection device, which is used to perform a leakage corrosion test on a support member to be tested for testing. Figure 8 , the device comprises: a support member to be detected 1, a power generation device 2 and a power source 3;

[0133] The support member to be detected 1, the power generation device 2 and the power supply 3 form an excitation detection circuit to detect the first potential.

[0134] The support member 1 to be detected may be a rod for supporting a power generation device. The power generation device 2 may be a photovoltaic panel.

[0135] Exemplarily, taking the support member to be detected as a rod as an example, the power supply is electrically connected to one end of the rod and the power generation equipment respectively. When the power supply excitation is applied, the rod, the power supply and the power generation equipment form an excitation detection circuit. When the power supply excitation is applied, the magnitude of the current and voltage flowing through different areas of the rod are different, and the leakage corrosion conditions are also different. And from close to the power supply excitation end to far away from the excitation end, the degree of corrosion of the rod gradually decreases until corrosion just does not occur at a certain place. The leakage potential when corrosion just does not occur is the critical corrosion potential of the rod, that is, the first potential.

[0136] Optionally, continue to refer to Figure 8 The leakage corrosion detection device also includes a water spray pipe 4, a water tank 5, a support structure 6 and a water pump 7; the support member 1 to be detected is placed in the water tank 5 and is arranged parallel to the power generation equipment 2 at a preset distance; the support structure 6 is fixedly arranged in the water tank 5, used to support the power generation equipment 2; the water pump 7 is used to provide a medium liquid to the water spray pipe 4; the water spray pipe 4 is arranged above the power generation equipment 2.

[0137] The preset distance can be adjusted by the supporting structure.

[0138] Fig. 9 is a structural schematic diagram of a support structure provided in an embodiment of the present invention, Fig.10 is a schematic diagram of another supporting structure provided in an embodiment of the present invention. Fig. 9 It is a telescopic structural component formed by combining two rectangular components, wherein through holes can be set at the same position on the opposite sides of each rectangular component, and the through holes are used to fix the two rectangular components with fixing parts such as pins and bolts when the relative height of the two rectangular components is adjusted. Fig.10 It is a retractable structural component composed of two cylinders with different cross-sectional diameters; among them, the cylinder with a larger cross-sectional diameter is a hollow cylinder, and its hollow diameter is the same as the cross-sectional diameter of the cylinder with a smaller cross-sectional diameter, and the cylinder with a larger diameter is provided with an internal thread inside, and the outer wall of the cylinder with a smaller cross-sectional diameter is provided with an external thread, thereby, the two cylinders can achieve height adjustment through the cooperation of the threaded structure.

[0139] Optionally, the supporting structure is a telescopic structural component.

[0140] Among them, the support structure is a telescopic structure, and its height can be adjusted, so as to adjust the distance between the test power generation equipment and the test support member to be detected, that is, adjust the preset distance.

[0141] For example, the specific structural setting of the support structure can refer to Fig. 9 and Fig.10 , and its height h can be adjusted.

[0142] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0143] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A leakage corrosion detection method, characterized in that: Used to detect a support member of a power generation device, wherein the support member is a rod member of a photovoltaic module and is used to support the photovoltaic module; the method comprises: Obtaining a critical corrosion potential at which leakage corrosion occurs on the support member to be detected, recorded as a first potential; Detecting the actual potential of the support member to be detected corresponding to the power generation equipment, and recording it as a second potential; judging whether the support member to be detected is corroded according to the second potential and the first potential of the support member to be detected; if the second potential of the support member to be detected is greater than the first potential, the support member to be detected is corroded; otherwise, the support member to be detected is not corroded; Before obtaining the critical corrosion potential of the support member to be tested for leakage corrosion, the method further includes: performing a leakage corrosion test on the support member to be tested for testing to obtain the first potential, including: Dividing the support member to be detected into a plurality of preset measurement areas, and applying power excitation to the support member to be detected; Measure the leakage current and leakage potential of each preset measurement area; A leakage current and leakage potential correspondence curve is drawn according to the leakage current and leakage potential of all preset measurement areas; and the first potential of the support member to be detected is determined according to the correspondence curve.

2. The leakage corrosion detection method according to claim 1, characterized in that: Determining the first potential of the support member to be detected according to the corresponding relationship curve includes: The leakage potential between the occurrence of leakage corrosion and the non-occurrence of leakage corrosion in the corresponding relationship curve is used as the first potential.

3. The leakage corrosion detection method according to claim 1, characterized in that: The step of applying power supply excitation to the support member to be detected and measuring the leakage current and leakage potential of each preset measurement area comprises: Apply power excitation to one end of the support member to be tested; after the excitation, starting from the preset measurement area close to the power excitation end, measure the leakage current and leakage potential of all preset measurement areas in sequence and record them.

4. The leakage corrosion detection method according to claim 1, characterized in that: After the support member to be inspected is corroded, the method further includes detecting a corrosion rate of the support member to be inspected.

5. The leakage corrosion detection method according to claim 4, characterized in that: The detecting the corrosion rate of the support member to be detected comprises: Acquiring the distance between the power generation device and the support member to be detected, the second potential of the support member to be detected, and the electrical parameters of the support member to be detected; The corrosion rate of the support member to be detected is determined according to the distance between the power generation device and the support member to be detected, the second potential of the support member to be detected and the electrical parameters of the support member to be detected.

6. The leakage corrosion detection method according to claim 5, characterized in that: The electrical parameters of the support member to be detected include at least one of: corrosion coefficient, equivalent atomic weight of the support member to be detected, density, Faraday constant and number of lost electrons.

7. The leakage corrosion detection method according to claim 6, characterized in that: The corrosion of the support member to be detected includes surface coating corrosion and internal substrate corrosion; When the surface coating of the support member to be detected is corroded, the distance between the power generation device and the support member to be detected is the distance between the power generation device and the surface coating, and the electrical parameters of the support member to be detected are the electrical parameters of the surface coating; When the inner substrate of the support member to be detected is corroded, the distance between the power generation device and the support member to be detected is the distance between the power generation device and the inner substrate, and the electrical parameters of the support member to be detected are the electrical parameters of the inner substrate.

8. The leakage corrosion detection method according to claim 1, characterized in that: The first potential is the potential of the support member to be detected, or the potential difference between the support member to be detected and the power generation equipment; The second potential is the potential of the support member to be detected, or the potential difference between the support member to be detected and the power generation equipment.

9. The leakage corrosion detection method according to claim 1, characterized in that: The present invention further comprises: performing a leakage corrosion test on the support member to be tested for testing; A water pump is used to supply dielectric liquid to a water spray pipe, and the dielectric liquid is sprayed to the power generation equipment disposed in a water tank through the water spray pipe, so that when power excitation is applied, the support member to be detected, the power generation equipment and the power supply form an excitation detection circuit to detect the first potential.

10. The leakage corrosion detection method according to claim 9, characterized in that: The present invention further comprises: performing a leakage corrosion test on the support member to be tested for testing; By adjusting the height of the support structure, the spacing between the test support member to be tested and the test power generation equipment is adjusted to obtain multiple groups of test spacings and corresponding first potentials obtained by the leakage corrosion test; The spacing between the power generation equipment and the support member to be detected in the application scenario is obtained, and matched with multiple groups of test spacings, and the first potential obtained from the leakage corrosion test corresponding to the successfully matched test spacing is compared with that in the application scenario.

11. A leakage corrosion detection device, characterized in that: Used to perform leakage corrosion test on the support member to be tested for testing, the device comprises: the support member to be tested, power generation equipment and power supply; the support member to be tested is a rod of a photovoltaic module, used to support the photovoltaic module; The support member to be detected, the power generation device and the power supply form an excitation detection circuit to detect a first potential; Conducting a leakage corrosion test on the test support member to obtain the first potential includes: Dividing the support member to be detected into a plurality of preset measurement areas, and applying power excitation to the support member to be detected; Measure the leakage current and leakage potential of each preset measurement area; Draw a leakage current and leakage potential correspondence curve according to the leakage current and leakage potential of all preset measurement areas; determine the first potential of the support member to be detected according to the correspondence curve; After the leakage corrosion test is performed on the test support member to be tested and the first potential is obtained, the method further includes: Obtaining a critical corrosion potential at which leakage corrosion occurs on the support member to be detected, recorded as a first potential; Detecting the actual potential of the support member to be detected corresponding to the power generation equipment, and recording it as a second potential; Whether the support member to be detected is corroded is determined according to the second potential and the first potential of the support member to be detected; if the second potential of the support member to be detected is greater than the first potential, the support member to be detected is corroded; otherwise, the support member to be detected is not corroded.

12. The leakage corrosion detection device according to claim 11, characterized in that: It also includes a water spray pipe, a water tank, a supporting structure and a water pump; the support member to be detected is placed in the water tank and is arranged parallel to the power generation equipment at a preset distance; the supporting structure is fixedly arranged in the water tank to support the power generation equipment; the water pump is used to provide a medium liquid to the water spray pipe; the water spray pipe is arranged above the power generation equipment.

13. The leakage corrosion detection device according to claim 12, characterized in that: The supporting structure is a telescopic structural component.

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