A transformer oil fluorescence signal multivariate correction acquisition and analysis device and method

Abstract

A transformer oil fluorescence signal multivariate correction collection and analysis device and method, belonging to the technical field of transformer fault diagnosis, solves the problems of large volume and weight, high cost and inconvenience in use when the existing fluorescence spectrometer collects and analyzes the fluorescence spectrum signal generated by the transformer oil; a positive multivariate correction filter or a negative multivariate correction filter is rotated into place, so that the center lines of the optical fiber head, the positive multivariate correction filter or the negative multivariate correction filter and the receiving lens of the fluorescence detector are on a straight line, and the fluorescence emitted by the transformer oil passes through the optical fiber interface, the optical fiber head, the positive multivariate correction filter or the negative multivariate correction filter and the receiving lens of the fluorescence detector in sequence; a multivariate correction filter group is used to collect and analyze the fluorescence signal emitted by the transformer oil, replacing the emission monochromator component of the fluorescence spectrometer, which not only reduces the equipment cost and reduces the equipment volume, but also quickly processes data, thereby improving the cost performance of transformer oil fault detection.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer fault diagnosis, and relates to a transformer oil fluorescence signal multivariate correction collection and analysis device and method. Background Art

[0002] Transformers are the core of energy conversion in the process of electricity production and distribution. There are huge numbers of them and their impact is wide-ranging. Their operating status directly affects the safe and reliable operation of the power system. Once an accident occurs in a transformer, it will not only damage expensive electrical equipment (the price of a single transformer is as high as 50 million yuan), but also cause large-scale power outages and even cause casualties, environmental pollution, and huge economic and social losses. Therefore, it is particularly important to monitor the operating status of the transformer.

[0003] Transformer oil refers to a type of insulating oil used in oil-filled electrical equipment such as transformers, reactors, mutual inductors, bushings, oil switches, etc., for insulation, cooling, and arc extinguishing. Transformer oil is a fractionation product of petroleum, and its main components are alkanes, cycloalkanes, aromatic unsaturated hydrocarbons, and non-hydrocarbon compounds. Transformer oil can emit fluorescence under ultraviolet or X-ray irradiation. The so-called fluorescence refers to a photoluminescent cold luminescence phenomenon. When a certain substance at room temperature is irradiated by incident light of a certain wavelength (usually ultraviolet or X-ray), it enters an excited state after absorbing light energy, and immediately de-excites and emits outgoing light with a longer wavelength than the incident light (usually a wavelength in the visible light band); and once the incident light stops, the luminescence phenomenon immediately disappears. The outgoing light with this property is called fluorescence.

[0004] The transformer operating status fluorescence detection technology (FMS) analyzes the changes in the optical signals of the transformer oil itself through a fluorescence detection device, thereby achieving the purpose of monitoring the transformer; for example, the Chinese invention patent document "A Transformer Oil Fluorescence Online Detection Device" with an application publication date of July 13, 2021 and an application publication number of CN113109682A, discloses a transformer oil fluorescence online detection device with high sensitivity, short analysis time, no interference from the surrounding magnetic and electric fields, good stability and reproducibility, etc., which can meet the online fault detection needs of the transformer under operating conditions.

[0005] The existing technology directly uses a fluorescence spectrometer to collect and analyze the fluorescence spectrum signal generated by the transformer oil. The fluorescence spectrometer uses an emission monochromator and a detector to collect the fluorescence spectrum signal, and then analyzes and processes the collected signal through a background software algorithm. However, the fluorescence spectrometer has a complex structure and has the disadvantages of being large and bulky. The on-site operation space is limited, and it is very inconvenient to carry a large and heavy device, and it is also expensive. Summary of the invention

[0006] The technical problem to be solved by the present invention is how to design a transformer oil fluorescence signal multivariate correction collection and analysis device and method to solve the problems of large volume and weight, high cost and inconvenience in use when the fluorescence spectrum signal generated by the transformer oil is collected and analyzed by the fluorescence spectrometer in the prior art.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A transformer oil fluorescence signal multivariate correction collection and analysis device comprises: a fluorescence signal collection and analysis darkroom (140), a fluorescence detector (141), a filter wheel (142), a multivariate correction filter group (143), an optical fiber head (145), and an optical fiber interface (146); the fluorescence detector (141) and the filter wheel (142) are both arranged inside the fluorescence signal collection and analysis darkroom (140); the multivariate correction filter group (143) is composed of a pair of positive multivariate correction filters and negative multivariate correction filters used in combination, the multivariate correction filter group (143) is mounted on the filter wheel (142), and the filter wheel (142) is rotatably arranged between the fluorescence detector (141) and the optical fiber head (145); the optical fiber head (145) is arranged on the inner side wall of the fluorescence signal collection and analysis darkroom (140), The optical fiber interface (146) is arranged on the side wall outside the fluorescent signal collection and analysis darkroom (140), and the optical fiber head (145) is connected to the optical fiber interface (146); the fluorescent detector (141) is used to receive the fluorescent signal emitted by the transformer oil and record the total fluorescence intensity value, and the multivariate correction filter group (143) is used to collect and analyze the fluorescent signal emitted by the transformer oil; when in use, the positive multivariate correction filter or the negative multivariate correction filter is rotated into place so that the center lines of the optical fiber head (145), the positive multivariate correction filter or the negative multivariate correction filter and the receiving lens of the fluorescent detector (141) are on a straight line, and the fluorescent light emitted by the transformer oil passes through the optical fiber interface (146), the optical fiber head (145), the positive multivariate correction filter or the negative multivariate correction filter and the receiving lens of the fluorescent detector (141) in sequence;

[0009] The design method of the multivariate correction filter set (143) comprises the following steps:

[0010] S1. Calculate the mapping relationship between the fluorescence spectrum of transformer oil and the concentration of aromatic hydrocarbon compounds using a multiple regression correction method to obtain a multiple regression correction coefficient;

[0011] S2. Hardwareize the multivariate regression correction coefficients described in step S1, as follows:

[0012] S21, taking the positive and negative coefficients of the normalized multivariate regression correction coefficient vector as the transmittance of the filter;

[0013] S22. Design the film structure of the positive multivariate correction filter and the negative multivariate correction filter according to the transmittance.

[0014] The present invention adopts a multivariate correction filter group to collect and analyze the fluorescent signal emitted by the transformer oil, replacing the emission monochromator component of the fluorescence spectrometer, which not only reduces the equipment cost and reduces the equipment size, but also speeds up data processing, thereby improving the cost performance of transformer oil fault detection.

[0015] Furthermore, the mapping relationship described in step S1 is specifically as follows:

[0016] The fluorescence spectrum of transformer oil is directly related to the concentration of aromatic hydrocarbon compounds. The calculation formula for the concentration of aromatic hydrocarbon compounds is calculated using multiple linear regression:

[0017] c=a1s1+a2s2+…+a n s n +b

[0018] Where c is the concentration of aromatic hydrocarbons, a1~a n The multiple regression correction coefficients of the fluorescence spectrum are obtained for the 1st to nth bands, s1~s n is the fluorescence spectrum of the 1st to nth bands, b is the bias coefficient;

[0019] The vector form of the multiple linear regression correction calculation formula for aromatic hydrocarbon concentration is:

[0020] c=·a+b

[0021] Where a=(a1,a2…a n ), a is the regression correction coefficient vector; s=(s1,s2…s n ) T , s is the fluorescence spectrum vector.

[0022] Furthermore, the calculation process of the transmittance in step S21 is as follows:

[0023] Defining half coefficients and and They are respectively i The positive and negative parts of , that is:

[0024]

[0025] Find the maximum of the half coefficients:

[0026]

[0027] Thus, the transmittance of the positive and negative filters are obtained:

[0028] t i + =a i + / m;t i - =a i - / m

[0029] Where i = 1, 2…n, n is a natural number, a i is the i-th element of the regression correction coefficient vector a.

[0030] Furthermore, the process of film structure design described in step S22 is: divide the transmittance vector t into two parts according to positive and negative values ​​to form a positive vector A and a negative vector B, take the absolute value of the negative vector B to obtain vector B2, and optimize the design of the positive filter and the negative filter with vector A and vector B2 as the target respectively; first select the initial film structure of the filter respectively, then change the thickness of each film layer, and judge whether the similarity between the filter transmittance and vector A and vector B2 reaches the threshold, if so, the design of the positive filter and the negative filter is completed; if not, judge whether the iteration reaches the predetermined number of times, if the iteration does not reach the predetermined number of times, continue to change the thickness of each film layer; if the iteration has reached the predetermined number of times, increase the number of film layers and reselect the initial film structure of the filter.

[0031] Furthermore, the transformer oil fluorescence signal multivariate correction collection and analysis device also includes: a fluorescence detector mounting bracket (147), the fluorescence detector mounting bracket (147) is arranged on the inner bottom plate of the fluorescence signal collection and analysis darkroom (140), and the fluorescence detector (141) is fixedly mounted on the fluorescence detector mounting bracket (147); the fluorescence detector mounting bracket (147) is provided with a through hole that matches the receiving lens of the fluorescence detector (141), and the receiving lens of the fluorescence detector (141) is aligned with the through hole.

[0032] Furthermore, the transformer oil fluorescence signal multivariate correction collection and analysis device also includes: a filter wheel drive motor (144) and a filter wheel drive motor mounting bracket (148); the filter wheel drive motor (144) is fixedly mounted on the filter wheel drive motor mounting bracket (148); the filter wheel drive motor mounting bracket (148) is arranged on the inner bottom plate of the fluorescence signal collection and analysis darkroom (140); the filter wheel (142) is sleeved on the rotating shaft of the filter wheel drive motor (144); and the filter wheel drive motor (144) drives the filter wheel (142) to rotate.

[0033] Furthermore, the inner wall of the fluorescent signal collection and analysis darkroom (140) is coated with light-absorbing paint.

[0034] The advantages of the present invention are:

[0035] The present invention adopts a multivariate correction filter group to collect and analyze the fluorescent signal emitted by the transformer oil, replacing the emission monochromator component of the fluorescence spectrometer, which not only reduces the equipment cost and reduces the equipment size, but also speeds up data processing, thereby improving the cost performance of transformer oil fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 2 is a front view of a transformer oil fluorescence signal multivariate correction acquisition and analysis device according to an embodiment of the present invention;

[0037] Figure 2 2 is a front view of a transformer oil fluorescence signal multivariate correction acquisition and analysis device according to an embodiment of the present invention;

[0038] Figure 3 2 is a rear view of the transformer oil fluorescence signal multivariate correction acquisition and analysis device according to an embodiment of the present invention;

[0039] Figure 4 2 is a left side view of the transformer oil fluorescence signal multivariate correction acquisition and analysis device according to an embodiment of the present invention;

[0040] Figure 5 2 is a right side view of the transformer oil fluorescence signal multivariate correction acquisition and analysis device according to an embodiment of the present invention;

[0041] Figure 6 2 is a top view of a transformer oil fluorescence signal multivariate correction acquisition and analysis device according to an embodiment of the present invention;

[0042] Figure 7 is a schematic structural diagram of a filter wheel according to an embodiment of the present invention;

[0043] Figure 8 Schematic diagram of transmittance calculation principle of a multivariate correction filter according to an embodiment of the present invention;

[0044] Fig. 9 It is a design flow chart of the film system structure of the multivariate correction filter according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are 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 are within the scope of protection of the present invention.

[0046] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0047] Embodiment 1

[0048] like Figures 1 to 6 As shown, the transformer oil fluorescence signal collection and analysis device of this embodiment includes: a fluorescence signal collection and analysis darkroom (140), a fluorescence detector (141), a filter wheel (142), a multivariate correction filter group (143), a filter wheel drive motor (144), an optical fiber head (145), an optical fiber interface (146), a fluorescence detector mounting bracket (147), and a filter wheel drive motor mounting bracket (148).

[0049] The fluorescence detector (141) is fixedly mounted on a fluorescence detector mounting bracket (147), which is arranged on a bottom plate inside a fluorescence signal acquisition and analysis darkroom (140), and a through hole matching a receiving lens of the fluorescence detector (141) is provided on the fluorescence detector mounting bracket (147), and the receiving lens of the fluorescence detector (141) is aligned with the through hole; the inner wall of the fluorescence signal acquisition and analysis darkroom (140) is coated with light-absorbing paint to prevent external interference ambient light from entering and eliminate the influence of multiple internal reflected light.

[0050] The filter wheel drive motor (144) is fixedly mounted on a filter wheel drive motor mounting bracket (148); the filter wheel drive motor mounting bracket (148) is arranged on a bottom plate inside a fluorescent signal collection and analysis darkroom (140); the filter wheel (142) is arranged between the fluorescent detector (141) and the filter wheel drive motor (144); the filter wheel (142) is sleeved on a rotating shaft of the filter wheel drive motor (144); and the filter wheel drive motor (144) drives the filter wheel (142) to rotate.

[0051] The optical fiber head (145) is fixedly arranged on the side wall at the right end inside the fluorescent signal collection and analysis darkroom (140), and the optical fiber interface (146) is fixedly arranged on the side wall at the right end outside the fluorescent signal collection and analysis darkroom (140), and the optical fiber head (145) is connected with the optical fiber interface (146).

[0052] like Figure 7 As shown, the filter wheel (142) is disc-shaped, and a plurality of multivariate correction filter groups (143) of different wavelengths are installed on the edge of the filter wheel (142). The optical fiber head (145), the multivariate correction filter group (143), the through hole opened on the fluorescence detector mounting bracket (147), and the center line of the receiving lens of the fluorescence detector (141) are on a straight line.

[0053] The working process of the device is as follows:

[0054] The filter wheel driving motor (144) drives the filter wheel (142) to rotate, switches the multivariate correction filter group (143) of the corresponding wavelength to align with the receiving lens of the fluorescence detector (141), and the fluorescence emitted by the transformer oil passes through the optical fiber interface (146), the optical fiber head (145), the multivariate correction filter group (143), the through hole opened on the fluorescence detector mounting bracket (147) and the receiving lens of the fluorescence detector (141) in sequence; the multivariate correction filter group (143) is used to collect, analyze and process the fluorescence emitted by the transformer oil; and the fluorescence detector (141) adopts a photomultiplier tube, which is used to receive the fluorescence emitted by the transformer oil and record the total fluorescence intensity value.

[0055] The design method of the multivariate correction filter set (143) is as follows:

[0056] The design principle of the multivariate correction filter is to hardware the multivariate linear regression correction coefficient vector for calculating the concentration of aromatic hydrocarbon compounds, and to realize the hardware of the multivariate correction coefficient by designing positive and negative correction filters.

[0057] The fluorescence spectrum of transformer oil is directly related to the concentration of aromatic hydrocarbon compounds. The calculation formula for the concentration of aromatic hydrocarbon compounds is calculated using multiple linear regression:

[0058] c=a1s1+a2s2+…+a n s n +b

[0059] Where c is the concentration of aromatic hydrocarbons, a1~a n The regression correction coefficients of the fluorescence spectrum are obtained for the 1st to nth bands, s1~s n is the fluorescence spectrum of the 1st to nth bands, b is the bias coefficient;

[0060] The vector form of the multiple linear regression correction calculation formula for aromatic hydrocarbon concentration is:

[0061] c=s·a+b

[0062] Where a=(a1,a2…a n ), a is the regression correction coefficient vector; s=(s1,s2…sn ) T , s is the fluorescence spectrum vector.

[0063] like Figure 8 As shown, the positive and negative parts of the regression correction coefficient vector a are made into two correction filters, that is, the positive and negative coefficients of the regression correction coefficient vector a after standardization are used as the transmittance of the filter.

[0064] Defining half coefficients and and They are respectively i The positive and negative parts of , that is:

[0065]

[0066] Find the maximum of the half coefficients:

[0067]

[0068] Thus, the transmittance of the positive and negative filters are obtained:

[0069] t i + =a i + / m;t i - =a i - / m

[0070] Assume that the current detection target fluorescence spectrum is s i , then the energy received by the detector is expressed as:

[0071] P + =s i ·t + ;P - =s i ·t -

[0072] Measure P + and P - , the final aromatic hydrocarbon concentration c is calculated as follows:

[0073] c=c + -c - + b = (P + -P - )m+b

[0074] Among them, c + =(P + )m;c - =(P -)m; i = 1, 2…n, n is a natural number, a i is the i-th element of the regression correction coefficient vector a, t i + is the vector t + The i-th element of i - is the vector t - The ith element of .

[0075] like Fig. 9 As shown, the process of film structure design is as follows: divide the transmittance vector t into two parts according to positive and negative values ​​to form a positive vector A and a negative vector B, take the absolute value of the negative vector B to obtain vector B2, and optimize the design of the positive filter and the negative filter with vector A and vector B2 as the target respectively; first select the initial film structure of the filter respectively, then change the thickness of each film layer, and judge whether the similarity between the filter transmittance and vector A and vector B2 reaches the threshold, if so, the design of the positive filter and the negative filter is completed; if not, judge whether the iteration has reached the predetermined number of times, if not, continue to change the thickness of each film layer; if the iteration has reached the predetermined number of times, increase the number of film layers and reselect the initial film structure of the filter.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transformer oil fluorescence signal multivariate correction acquisition and analysis device, characterized in that: include: A fluorescence signal collection and analysis darkroom (140), a fluorescence detector (141), a filter wheel (142), a multivariate correction filter group (143), an optical fiber head (145), and an optical fiber interface (146); the fluorescence detector (141) and the filter wheel (142) are both arranged inside the fluorescence signal collection and analysis darkroom (140); the multivariate correction filter group (143) is composed of a pair of positive multivariate correction filters and negative multivariate correction filters used in combination, the multivariate correction filter group (143) is mounted on the filter wheel (142), the filter wheel (142) is rotatably arranged between the fluorescence detector (141) and the optical fiber head (145); the optical fiber head (145) is arranged on the inner side wall of the fluorescence signal collection and analysis darkroom (140), and the optical fiber interface (146) The optical fiber head (145) is arranged on the side wall outside the fluorescent signal collection and analysis darkroom (140), and is connected with the optical fiber interface (146); the fluorescent detector (141) is used to receive the fluorescent signal emitted by the transformer oil and record the total fluorescence intensity value, and the multivariate correction filter group (143) is used to collect and analyze the fluorescent signal emitted by the transformer oil; when in use, the positive multivariate correction filter or the negative multivariate correction filter is rotated into place, so that the center lines of the optical fiber head (145), the positive multivariate correction filter or the negative multivariate correction filter and the receiving lens of the fluorescent detector (141) are on a straight line, and the fluorescent light emitted by the transformer oil passes through the optical fiber interface (146), the optical fiber head (145), the positive multivariate correction filter or the negative multivariate correction filter and the receiving lens of the fluorescent detector (141) in sequence; The design method of the multivariate correction filter set (143) comprises the following steps: S1. Calculate the mapping relationship between the fluorescence spectrum of transformer oil and the concentration of aromatic hydrocarbon compounds by using a multiple regression correction method to obtain a multiple regression correction coefficient; S2. Hardwareize the multivariate regression correction coefficients described in step S1, as follows: S21, taking the positive and negative coefficients of the normalized multivariate regression correction coefficient vector as the transmittance of the filter; S22. Design the film structure of the positive multivariate correction filter and the negative multivariate correction filter according to the transmittance.

2. The transformer oil fluorescence signal multivariate correction acquisition and analysis device according to claim 1, characterized in that: The mapping relationship described in step S1 is specifically as follows: The fluorescence spectrum of transformer oil is directly related to the concentration of aromatic hydrocarbon compounds. The calculation formula for the concentration of aromatic hydrocarbon compounds is calculated using multiple linear regression: c=a1s1+a2s2+…+a n s n +b Where c is the concentration of aromatic hydrocarbons, a1~a n The multiple regression correction coefficients of the fluorescence spectrum are obtained for the 1st to nth bands, s1~s n is the fluorescence spectrum of the 1st to nth bands, b is the bias coefficient; The vector form of the multiple linear regression correction calculation formula for aromatic hydrocarbon concentration is: c=s·a+b Where a=(a1,a2…a n ), a is the regression correction coefficient vector; s=(s1,s2…s n ) T , s is the fluorescence spectrum vector.

3. The transformer oil fluorescence signal multivariate correction acquisition and analysis device according to claim 2 is characterized in that: The calculation process of the transmittance described in step S21 is as follows: Defining half coefficients and and They are respectively i The positive and negative parts of , that is: Find the maximum of the half coefficients: Thus, the transmittance of the positive and negative filters are obtained: t i + =a i + / m;t i - =a i - / m Where i = 1, 2…n, n is a natural number, a i is the i-th element of the regression correction coefficient vector a, t i is the i-th element of the transmittance vector t.

4. The transformer oil fluorescence signal multivariate correction acquisition and analysis device according to claim 3 is characterized in that: The process of film structure design described in step S22 is: divide the transmittance vector t into two parts according to positive and negative values ​​to form a positive vector A and a negative vector B, take the absolute value of the negative vector B to obtain vector B2, and optimize the design of the positive filter and the negative filter with vector A and vector B2 as the target respectively; first select the initial film structure of the filter respectively, then change the thickness of each film layer, and judge whether the similarity between the filter transmittance and vector A and vector B2 reaches the threshold, if so, the design of the positive filter and the negative filter is completed; if not, judge whether the iteration reaches the predetermined number of times, if the iteration does not reach the predetermined number of times, continue to change the thickness of each film layer; if the iteration has reached the predetermined number of times, increase the number of film layers and reselect the initial film structure of the filter.

5. The transformer oil fluorescence signal multivariate correction acquisition and analysis device according to claim 1, characterized in that: Also includes: A fluorescence detector mounting bracket (147), wherein the fluorescence detector mounting bracket (147) is arranged on the inner bottom plate of the fluorescence signal acquisition and analysis darkroom (140), and the fluorescence detector (141) is fixedly mounted on the fluorescence detector mounting bracket (147); a through hole matching the receiving lens of the fluorescence detector (141) is provided on the fluorescence detector mounting bracket (147), and the receiving lens of the fluorescence detector (141) is aligned with the through hole.

6. The transformer oil fluorescence signal multivariate correction acquisition and analysis device according to claim 5, characterized in that: Also includes: A filter wheel drive motor (144) and a filter wheel drive motor mounting bracket (148); the filter wheel drive motor (144) is fixedly mounted on the filter wheel drive motor mounting bracket (148); the filter wheel drive motor mounting bracket (148) is arranged on the inner bottom plate of a fluorescent signal collection and analysis darkroom (140); the filter wheel (142) is sleeved on the rotating shaft of the filter wheel drive motor (144); and the filter wheel drive motor (144) drives the filter wheel (142) to rotate.

7. The transformer oil fluorescence signal multivariate correction acquisition and analysis device according to claim 6, characterized in that: The inner wall of the fluorescent signal collection and analysis darkroom (140) is coated with light absorbing paint.

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