Transformer oil chromaticity sensing detection apparatus and method

Abstract

The present application provides a transformer oil chromaticity sensing detection apparatus, comprising a pipe, a probe, a transmitter, a receiver and a photoelectric conversion module; the apparatus uses an optical fiber sensing technology, analyzes color coordinates of reflected light by means of incidence and reflection of an artificial standard light source on transformer oil, and can automatically complete automatic collection of color space color coordinates. The present application also provides a transformer oil chromaticity sensing detection method, applied to the transformer oil chromaticity sensing detection apparatus. Because there is a mapping relationship between color numbers 0.5-8 of a glass color standard palette and CIE1931 standard color x, y and z coordinates of the International Commission on Illumination, the color number of the transformer oil can be inversely derived by means of measuring the CIE1931 color coordinates of the transformer oil. By using the transformer oil chromaticity sensing detection apparatus and method of the present application to measure transformer oil chromaticity, the influence of manual operation skill level is avoided, and the problem of poor repeatability of measuring transformer oil chromaticity by a visual inspection method is solved.

Description

Transformer oil chromaticity sensing device and method Technical Field

[0001] The present application relates to the field of power engineering transformers, and primarily to a sensor detection device and method for transformer oil chromaticity. Background Art

[0002] Transformer oil is the primary insulating and cooling medium for power transformers. Testing transformer oil parameters is a crucial technical means of evaluating transformer oil quality and ensuring safe and stable operation of transformer equipment. Chroma is a key transformer oil parameter and one of the 19 parameters specified in the national standard GB / T7595, "Quality of Transformer Oil in Operation." Testing transformer oil color provides a straightforward and convenient way to analyze the degree of transformer oil deterioration.

[0003] Visual inspection is the national standard recommended method for testing transformer oil color. A sample is injected into a container and its color is compared to a glass color standard. The color number that matches the sample is the sample color. Because the standard color number for oils ranges from 0.5 to 8, operator error can occur during visual inspection. This error is significantly affected by the operator's skill level and the accuracy of the colorimeter. Consequently, visual inspection of transformer oil color has poor repeatability.

[0004] Summary of the Invention

[0005] To address the problem of poor repeatability in visually measuring transformer oil color, the present application provides a device and method for sensing and detecting transformer oil color. The device comprises a pipe, a probe, a transmitter, a receiver, and a photoelectric conversion module. A window is provided on the side wall of the pipe, the window is connected to the probe, the transmitter and receiver are electrically connected to the photoelectric conversion module, an optical fiber is connected between the transmitter and the probe, and an optical fiber is connected between the receiver and the probe.

[0006] The receiver is configured to:

[0007] receiving the reflected light signal transmitted back by the optical fiber, and sending the reflected light signal to the photoelectric conversion module;

[0008] The photoelectric conversion module is configured as follows:

[0009] receiving an optical signal of the reflected light, and performing analog-to-digital conversion on the optical signal of the reflected light to obtain color coordinates;

[0010] In response to the detection instruction, sending a light emission instruction to the emitter;

[0011] The transmitter is configured to:

[0012] In response to the light-emitting instruction, an optical signal is sent to the window through the optical fiber and the probe.

[0013] This device uses fiber optic sensing technology to analyze the color coordinates of the reflected light from an artificial standard light source incident on and reflected from transformer oil to determine the oil's chromaticity. A pipeline is used for the inlet and outlet of transformer oil samples, with a window mechanically connected to the probe. Two optical fibers, one for the incident indicator light and the other for the reflected light, are used for the transmission of the light source. The transmitter provides the light source. The receiver collects the received light and transmits the reflected light signal to the photoelectric conversion module, which processes it. This module performs photoelectric conversion, analog-to-digital conversion, and control, providing the color coordinates of the transformer oil sample.

[0014] Optionally, the window is made of incandescent organic glass or incandescent quartz glass.

[0015] Optionally, a coating is provided on the inner wall of the pipe, and the coating is used to absorb stray light and reduce the interference of the color of the pipe on the color detection of the sample.

[0016] Optionally, the pipe is made of metal or organic polymer material.

[0017] Optionally, the photoelectric conversion module includes an AD converter and a logic controller;

[0018] The AD converter is configured as follows:

[0019] receiving the reflected light signal, and performing analog-to-digital conversion on the reflected light signal to obtain color coordinates;

[0020] The logic controller is configured to:

[0021] In response to the detection instruction, a light emission instruction is sent to the emitter.

[0022] Optionally, the light source of the emitter is an artificial standard light source with a color temperature of 2856K.

[0023] The present application also provides a method for sensing and detecting the chromaticity of transformer oil, which uses any of the above-mentioned sensing and detecting devices for the chromaticity of transformer oil, comprising:

[0024] When there is no transformer oil in the pipeline, a detection instruction is sent to the logic controller to obtain background color coordinates;

[0025] introducing transformer oil into the pipeline, sending a detection instruction to the logic controller, and obtaining the color coordinates of the transformer oil;

[0026] The standard color number of the transformer oil is calculated based on the color coordinates of the transformer oil.

[0027] Optionally, if the background color coordinates do not satisfy 0.314<x<0.330, 0.337<y<0.341, 0.329<z<0.349, then replace or adjust the emitter and re-measure the background color coordinates;

[0028] If the background color coordinates satisfy 0.314<x<0.330, 0.337<y<0.341, 0.329<z<0.349, transformer oil is introduced into the pipeline.

[0029] Optionally, the transformer oil chromaticity sensing detection method specifically includes:

[0030] A transformer oil color number matrix and a transformer oil color coordinate matrix are constructed, and a mapping relationship and a coefficient matrix between the transformer oil color number matrix and the transformer oil color coordinate matrix are constructed. The transformer oil color number is obtained according to the mapping relationship.

[0031] Optionally, the transformer oil chromaticity sensing detection method specifically includes:

[0032] The transformer oil color number is normalized to obtain the transformer oil standard color number.

[0033] The present application provides a sensing and detection device for transformer oil chromaticity, comprising a pipe, a probe, a transmitter, a receiver, and a photoelectric conversion module. The device employs fiber optic sensing technology, analyzes the color coordinates of the reflected light through the incidence and reflection of an artificial standard light source on the transformer oil, and can automatically complete the acquisition of color space color coordinates. The present application also provides a sensing and detection method for transformer oil chromaticity, utilizing the aforementioned sensing and detection device for transformer oil chromaticity. Because the color numbers 0.5 to 8 of the glass color standard colorimetric plate are mapped to the x, y, and z values ​​of the International Commission on Illumination (CIE) 1931 standard color coordinates, the color number of the transformer oil can be inverted by measuring the CIE 1931 color coordinates of the transformer oil. The device and method of the present application are used to measure transformer oil chromaticity, which is not affected by the level of manual operation and solves the problem of poor repeatability in visually measuring transformer oil chromaticity. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] FIG1 is a schematic diagram of a sensor detection device for transformer oil chromaticity;

[0036] FIG2 is a flow chart of a method for sensing and detecting transformer oil chromaticity;

[0037] Legend:

[0038] 1-Pipeline; 11-Coating; 12-Window; 2-Probe; 3-Transmitter; 4-Receiver; 5-Optical fiber; 6-Photoelectric conversion module. DETAILED DESCRIPTION

[0039] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0040] Transformer oil is the primary insulating and cooling medium for power transformers. Testing transformer oil parameters is a crucial technical means of evaluating transformer oil quality and ensuring safe and stable operation of transformer equipment. Chroma is a key transformer oil parameter and one of the 19 parameters specified in the national standard GB / T7595, "Quality of Transformer Oil in Operation." Testing transformer oil color provides a straightforward and convenient way to analyze the degree of transformer oil deterioration.

[0041] Visual inspection is the national standard recommended method for testing transformer oil color. A sample is injected into a container and its color is compared to a glass color standard. The color number that matches the sample is the sample color. Because the standard color number for oils ranges from 0.5 to 8, operator error can occur during visual inspection. This error is significantly affected by the operator's skill level and the accuracy of the colorimeter. Therefore, this method is only suitable for offline laboratory measurements.

[0042] According to the national standard GB / T6540 "Method for Determination of Color of Petroleum Products", there is a mapping relationship between the color numbers 0.5 to 8 of the glass color standard color chart and the x, y, and z values ​​of the International Commission on Illumination CIE1931 standard color coordinates. Therefore, by measuring the CIE1931 color coordinates of transformer oil, the color number of transformer oil can be inverted.

[0043] Fiber optic sensing encompasses both the perception and transmission of external signals (the measured quantity). Perception (or sensitivity) refers to the way external signals change, causing the physical parameters of the light waves propagating through the fiber, such as intensity (power), wavelength, frequency, phase, and polarization state, to change according to their changing patterns. Measuring these changes in optical parameters is the process of "perceiving" these changes in external signals. This "perception" essentially involves the real-time modulation of the light waves propagating through the fiber by the external signal.

[0044] Transmission refers to the optical fiber transmitting light waves modulated by external signals to a photodetector for detection, extracting the external signals from the light waves, and performing data processing as needed, a process known as demodulation. Therefore, fiber optic sensing technology encompasses both modulation and demodulation: modulation techniques (or loading techniques) for modulating the lightwave parameters in the optical fiber by external signals (the measured quantity), and demodulation techniques (or detection techniques) for extracting the external signals (the measured quantity) from the modulated lightwaves. Based on the changes in the physical characteristic parameters of the lightwaves modulated by the external signals, lightwave modulation can be categorized into five types: intensity modulation, frequency modulation, wavelength modulation, phase modulation, and polarization modulation.

[0045] As shown in Figure 1, the sensing and detection device for transformer oil color provided in the present application includes a pipeline 1, a probe 2, a transmitter 3, a receiver 4, and a photoelectric conversion module 6. A window 12 is provided on the side wall of the pipeline 1, and the window 12 is connected to the probe 2. The transmitter 3 and the receiver 4 are electrically connected to the photoelectric conversion module 6. An optical fiber 5 is connected between the transmitter 3 and the probe 2, and an optical fiber 5 is connected between the receiver 4 and the probe 2.

[0046] The receiver 4 receives the reflected light signal transmitted back by the optical fiber 5 and sends the reflected light signal to the photoelectric conversion module 6. The photoelectric conversion module 6 receives the reflected light signal and performs analog-to-digital conversion on the reflected light signal to obtain color coordinates. In response to the detection instruction, the photoelectric conversion module 6 sends a light instruction to the transmitter 3. In response to the light instruction, the transmitter 3 sends a light signal to the window 12 via the optical fiber 5 and the probe 2. The transformer oil chromaticity sensing detection device provided in this application can automatically complete the automatic acquisition of color space color coordinates through a hardware system for measuring color numbers in a color space, with a high degree of automation.

[0047] This device uses optical fiber 5 sensing technology to analyze the color coordinates of the reflected light through the incidence and reflection of an artificial standard light source on the transformer oil to obtain the transformer oil chromaticity. Pipeline 1 is used for sampling and discharging transformer oil samples. A window 12 is partially opened in pipeline 1 and mechanically connected to probe 2. Two optical fibers 5 respectively realize the incidence of indicator light and the reception of light reflected by the sample. The light source is provided by transmitter 3. Receiver 4 collects the received light and sends the reflected light signal to the photoelectric conversion module 6. Photoelectric conversion module 6 processes the light, realizes photoelectric conversion and analog-to-digital conversion and control, and outputs the color coordinates of the transformer oil sample. The oil chromaticity sensor of the present invention has a high degree of integration and does not require testing equipment such as glass standard colorimetric cards and colorimeters. A single sensor can automatically complete chromaticity detection.

[0048] In some embodiments, the window 12 is made of incandescent organic glass or incandescent quartz glass.

[0049] In some embodiments, a coating 11 is provided on the inner wall of the pipe 1 to absorb stray light and reduce interference from the color of the pipe 1 on sample color detection. Coating 11 can also be applied locally to the inner wall of the pipe 1, around the viewing window 12. This reduces the amount of coating and prevents the color of the pipe 1 from affecting transformer color detection, ensuring a single background color during transformer oil color detection.

[0050] In some embodiments, the pipe 1 is made of metal or organic polymer. Metal or organic polymer materials are resistant to transformer oil corrosion and can be used as a transformer oil detection channel.

[0051] In some embodiments, the photoelectric conversion module 6 includes an AD converter and a logic controller. The AD converter receives the reflected light signal and performs analog-to-digital conversion on the reflected light signal to obtain color coordinates. The logic controller responds to the detection instruction and sends a light emission instruction to the emitter 3.

[0052] The colorimetric sensor used in this application can realize the acquisition of the color number of the flowing transformer oil and is applicable to the online and offline detection of the color in the transformer oil.

[0053] In some embodiments, the light source of the emitter 3 is an artificial standard light source with a color temperature of 2856 K. The emitter 3 can be adjusted or replaced to ensure that the color coordinates measured by the device are within the boundary range.

[0054] As shown in FIG2 , the present application further provides a method for sensing and detecting the chromaticity of transformer oil, which uses any of the above-mentioned sensing and detecting devices for the chromaticity of transformer oil, including:

[0055] First, when no transformer oil is in the pipeline, the background color coordinates are measured. Specifically, when no transformer oil is introduced into the pipeline, a detection instruction is sent to the logic controller. The logic controller controls the transmitter to transmit an optical signal to the window via an optical fiber and a probe, thereby measuring the background color coordinates.

[0056] Then, when transformer oil is present in the pipeline, the color coordinates of the transformer oil are measured. Specifically, transformer oil is introduced into the pipeline, and a detection instruction is sent to the logic controller. The logic controller controls the transmitter to transmit an optical signal to the window via an optical fiber and a probe, thereby measuring the color coordinates of the transformer oil.

[0057] Finally, the standard color number of the transformer oil is calculated based on the color coordinates of the transformer oil.

[0058] The method for calculating color numbers provided in this application can directly calculate color numbers from the color space, reducing the randomness and large errors of manual visual inspection.

[0059] In some embodiments, if the background color coordinates do not satisfy 0.314 < x < 0.330, 0.337 < y < 0.341, and 0.329 < z < 0.349, the emitter is replaced or adjusted and the background color coordinates are remeasured. If the background color coordinates satisfy 0.314 < x < 0.330, 0.337 < y < 0.341, and 0.329 < z < 0.349, transformer oil is introduced into the pipe. Table 1 shows the color coordinate boundary conditions.

[0060] In some embodiments, the transformer oil color sensing detection method specifically includes:

[0061] A transformer oil color number matrix and a transformer oil color coordinate matrix are constructed, and a mapping relationship and a coefficient matrix between the transformer oil color number matrix and the transformer oil color coordinate matrix are constructed. The transformer oil color number is obtained according to the mapping relationship.

[0062] Specifically, according to the mapping relationship between the color number value and the color coordinates x, y, z, the transformer oil color number matrix and the transformer oil color coordinate matrix are constructed respectively: Cn=[Cn1, Cn2,…, Cn i ,…,Cn N ] (1)

[0063] Where: Each value satisfies the following constraints: N≤16, 0.5≤Cn1,Cn2,…,Cn i ,…,Cn N ≤8;

[0064] Where: Each value satisfies the following constraints: X≤16, 0≤X, Y, Z≤1, x+y+z=1, N≤16.

[0065] Furthermore, a mapping relationship between color numbers and color coordinates is constructed, and a coefficient matrix A is established to satisfy the following relationship:

[0066] As shown in Table 1, the color coordinate boundary conditions are as follows: Cn=[0.5,1.0,1.5,…,4.0,…,8.0] (4)

[0067] Table 1 Color coordinate boundary conditions

[0068] Perform matrix inversion operation and solve formula (3) to obtain the coefficient matrix A and establish a one-to-one mapping relationship.

[0069] In some embodiments, the transformer oil color sensing detection method specifically includes:

[0070] The transformer oil color number is normalized to obtain the transformer oil standard color number.

[0071] Since the color number has 16 discrete values ​​ranging from 0.5 to 8, if the transformer oil color number cannot be consistent with the standard color number and falls between two standard colors, the higher color will be the standard color number of the transformer oil. Based on this principle, the following can be proposed:

[0072] Transformer oil color number Cn obtained from color coordinates i The color closest to the standard color number Cn is the standard color number of transformer oil, and the expression is as follows: Cnm=Cn i -Cn≤0.25 (5)

[0073] Example:

[0074] A detection command is sent to the logic controller, and a transmitter using an artificial incandescent light source transmits a light signal into the transformer oil via an optical fiber and a probe. A receiver receives the reflected light signal, and a photoelectric conversion module receives the reflected light signal and performs analog-to-digital conversion on the reflected light signal to obtain the background color coordinates x, y, and z when no transformer oil is passing through.

[0075] If the background color coordinates meet 0.314<x<0.330, 0.337<y<0.341, 0.329<z<0.349, proceed to the next step. If not, adjust and replace the emitter, and re-measure the background color coordinates.

[0076] Flowing transformer oil is introduced into the pipeline of the transformer oil color sensing detection device, a detection instruction is sent to the logic controller, and the transformer oil color coordinates x, y, z are obtained through the receiver.

[0077] The transformer oil color number is calculated by formula (3), and then the calculated transformer oil color number is normalized according to formula (5) to obtain the standard transformer oil color number.

[0078] The present application provides a sensing and detection device for transformer oil chromaticity, which includes a pipeline, a probe, a transmitter, a receiver, and a photoelectric conversion module. It adopts optical fiber sensing technology, analyzes the color coordinates of the reflected light through the incidence and reflection of an artificial standard light source on the transformer oil, and can automatically complete the automatic collection of color coordinates in the color space.

[0079] This application also provides a method for sensing and detecting transformer oil chromaticity, utilizing the aforementioned transformer oil chromaticity sensing and detection device. Because the color values ​​0.5 to 8 of the standard glass color chart are mapped to the x, y, and z values ​​of the International Commission on Illumination (CIE) 1931 standard color coordinates, the transformer oil color number can be inverted by measuring the CIE 1931 color coordinates of the transformer oil. Using the device and method described in this application to measure transformer oil chromaticity is unaffected by human operator skill, resolving the issue of poor repeatability in visually measuring transformer oil chromaticity.

[0080] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. A transformer oil chromaticity sensing device, characterized in that: The invention comprises a pipeline (1), a probe (2), a transmitter (3), a receiver (4) and a photoelectric conversion module (6), wherein a window (12) is arranged on a side wall of the pipeline (1), the window (12) is connected to the probe (2), the transmitter (3) and the receiver (4) are electrically connected to the photoelectric conversion module (6), an optical fiber (5) is connected between the transmitter (3) and the probe (2), and an optical fiber (5) is connected between the receiver (4) and the probe (2); The receiver (4) is configured to: receiving a reflected light signal transmitted back by the optical fiber (5), and sending the reflected light signal to the photoelectric conversion module (6); The photoelectric conversion module (6) is configured as follows: receiving an optical signal of the reflected light, and performing analog-to-digital conversion on the optical signal of the reflected light to obtain color coordinates; In response to the detection instruction, sending a light emission instruction to the transmitter (3); The transmitter (3) is configured as follows: In response to the light emitting instruction, a light signal is sent to the viewing window (12) via the optical fiber (5) and the probe (2).

2. The transformer oil chromaticity sensing detection device according to claim 1, characterized in that: The viewing window (12) is incandescent organic glass or incandescent quartz glass.

3. The transformer oil chromaticity sensing detection device according to claim 2, characterized in that: The inner wall of the pipe (1) is provided with a coating (11), and the coating (11) is used to absorb stray light and reduce the interference of the color of the pipe (1) on the detection of the color of the sample.

4. The transformer oil chromaticity sensing detection device according to claim 3, characterized in that: The pipe (1) is made of metal or organic polymer material.

5. The transformer oil chromaticity sensing detection device according to claim 4, characterized in that: The photoelectric conversion module (6) includes an AD converter and a logic controller; The AD converter is configured as: receiving the reflected light signal, and performing analog-to-digital conversion on the reflected light signal to obtain color coordinates; The logic controller is configured to: In response to the detection instruction, a light emission instruction is sent to the emitter (3).

6. The transformer oil chromaticity sensing detection device according to claim 4, characterized in that: The light source of the emitter (3) is an artificial standard light source with a color temperature of 2856K.

7. A method for sensing and detecting the chromaticity of transformer oil, characterized in that: The transformer oil chromaticity sensing detection device according to any one of claims 1 to 6 comprises: When there is no transformer oil in the pipeline, a detection instruction is sent to the logic controller to obtain the background color coordinates; Introducing transformer oil into the pipeline, sending a detection instruction to the logic controller, and obtaining the color coordinates of the transformer oil; The standard color number of the transformer oil is calculated according to the color coordinates of the transformer oil.

8. The method for sensing and detecting the chromaticity of transformer oil according to claim 7, characterized in that: If the background color coordinates do not satisfy 0.314<x<0.330, 0.337<y<0.341, 0.329<z<0.349, replace or adjust the emitter, and re-measure the background color coordinates; If the background color coordinates satisfy 0.314<x<0.330, 0.337<y<0.341, 0.329<z< 0.349, then transformer oil is introduced into the pipeline.

9. The method for sensing and detecting the chromaticity of transformer oil according to claim 8, characterized in that: Specifically include: A transformer oil color number matrix and a transformer oil color coordinate matrix are constructed, and a mapping relationship and a coefficient matrix between the transformer oil color number matrix and the transformer oil color coordinate matrix are constructed. The transformer oil color number is obtained according to the mapping relationship.

10. The method for sensing and detecting the chromaticity of transformer oil according to claim 9, characterized in that: Specifically include: The transformer oil color number is normalized to obtain the transformer oil standard color number.

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