A transformer foundation monitoring method and device

Abstract

The present invention discloses a method and device for monitoring a transformer foundation. Fiber Bragg grating (FBG) sensors are disposed at the periphery and center of the foundation. The method includes: obtaining the wavelength of the laser signal reflected by each fiber Bragg grating (FBG) sensor and uploaded by a laser receiver; calculating the vertical settlement distance of the foundation based on the wavelength of the laser signal reflected by the fiber Bragg grating (FBG) sensor at the center of the foundation and the intrinsic properties of each fiber Bragg grating sensor; calculating the strain of the fiber Bragg grating (FBG) sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating (FBG) sensor at the periphery of the foundation; and calculating the inclination angle of the foundation based on the vertical settlement distance of the foundation and the strain of the fiber Bragg grating (FBG) sensor. The transformer foundation monitoring method of an embodiment of the present invention uses multiple fiber Bragg grating (FBG) sensors to simultaneously monitor multiple parameters, such as settlement, inclination, and displacement, providing a comprehensive view of the status of the transformer foundation in a substation, improving monitoring accuracy and the timeliness of abnormality alarms.

Description

Technical Field

[0001] The present invention relates to a transformer foundation base monitoring technology, and in particular to a transformer foundation base monitoring method and device. Background Art

[0002] The safe and stable operation of substations plays a vital role in the stability of the power grid. As a key substation equipment, the stability of the transformer's foundation directly affects the safe operation and maintenance of the substation. The transformer foundation refers to the platform used to support the transformer, usually formed underground by pouring cement.

[0003] Traditional transformer foundation monitoring methods mostly rely on regular manual inspections. This method often cannot provide real-time data on the settlement, displacement and tilt of the transformer foundation, and the monitoring accuracy is low. When the foundation base has an abnormality, it may not be discovered and corresponding measures cannot be taken in time, increasing safety risks. Summary of the Invention

[0004] The present invention provides a transformer foundation monitoring method and device, which simultaneously monitors multiple parameters such as settlement, tilt and displacement through multiple fiber grating sensors, provides a comprehensive view of the status of the substation transformer foundation, and improves monitoring accuracy and the timeliness of abnormal alarms.

[0005] In a first aspect, the present invention provides a transformer foundation base monitoring method, wherein fiber Bragg grating sensors are provided on the periphery and center of the foundation base, comprising:

[0006] Acquiring the wavelength of the laser signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, wherein the multiple fiber Bragg grating sensors are coupled in series, the current fiber Bragg grating sensor receives the laser signal transmitted by the previous fiber Bragg grating sensor, reflects the laser signal to the previous fiber Bragg grating sensor, and sends the transmitted laser signal to the next fiber Bragg grating sensor, and the laser receiver determines the wavelength of the laser signal reflected by each fiber Bragg grating sensor based on the received laser signal;

[0007] Calculating the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor;

[0008] Calculating the strain of the fiber Bragg grating sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base;

[0009] The tilt angle of the base is calculated based on the vertical settlement distance of the base and the strain of the fiber grating sensor.

[0010] Optionally, fiber grating sensors are provided at the four corners of the basic base, the fiber grating sensors provided at the four corners of the basic base are placed horizontally, and the fiber grating sensor at the center of the basic base is placed vertically, and the laser transmission path is from one of the fiber grating sensors at the four corners of the basic base through the fiber grating sensors at the other three corners to the fiber grating sensor at the center of the basic base.

[0011] Optionally, the basic base is also provided with a fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain, which are respectively a first fiber Bragg grating sensor, a second fiber Bragg grating sensor, a third fiber Bragg grating sensor, a fourth fiber Bragg grating sensor, a fifth fiber Bragg grating sensor and a sixth fiber Bragg grating sensor according to the laser transmission path. Among them, the fiber Bragg grating sensor at the center of the basic base is the fifth fiber Bragg grating sensor, and the fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain is the sixth fiber Bragg grating sensor.

[0012] Optionally, calculating the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor includes:

[0013] using the wavelength of the laser signal reflected by the sixth fiber grating sensor as the first wavelength of the reflected light caused by the basic temperature change;

[0014] Calculating a difference between a wavelength of the laser signal reflected by the fifth fiber Bragg grating sensor and the first wavelength to obtain a second wavelength representing reflected light caused by sedimentation change;

[0015] The vertical settlement distance of the base is calculated based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor.

[0016] Optionally, the vertical settlement distance of the base is calculated based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor, and the calculation formula is as follows:

[0017]

[0018] Wherein, S represents the vertical settlement distance of the foundation base, Λ V is the second wavelength, λ B5 is the initial reflection wavelength of the fifth fiber Bragg grating sensor, L5 is the effective length of the fifth fiber Bragg grating sensor, P e is the photoelastic coefficient, and α is the strain sensitivity of the optical fiber, that is, the proportional coefficient between wavelength change and strain.

[0019] Optionally, calculating the strain of the fiber Bragg grating sensor based on the wavelength of a laser signal reflected by the fiber Bragg grating sensor at the periphery of the base includes:

[0020] Calculating the difference between the wavelength of the laser signal reflected by the j-th fiber Bragg grating sensor and the first wavelength to obtain a third wavelength, where j=1, 2, 3 or 4;

[0021] Calculating the difference between the third wavelength and the second wavelength to obtain a fourth wavelength representing reflected light caused by the tilt of the base;

[0022] The strain amount of the jth fiber Bragg grating sensor is calculated based on the fourth wavelength and an intrinsic property of the jth fiber Bragg grating sensor.

[0023] Optionally, the strain of the j-th fiber Bragg grating sensor is calculated based on the fourth wavelength and the intrinsic properties of the j-th fiber Bragg grating sensor, and the calculation formula is as follows:

[0024]

[0025] Where, ΔL ij is the strain of the j-th fiber Bragg grating sensor, Λ ij is the fourth wavelength, λ Bj is the initial reflection wavelength of the jth fiber Bragg grating sensor, L ij is the effective length of the jth fiber Bragg grating sensor, P e is the photoelastic coefficient, and α is the strain sensitivity of the optical fiber, that is, the proportional coefficient between wavelength change and strain.

[0026] Optionally, the inclination angle of the base is calculated based on the vertical settlement distance of the base and the strain of the fiber grating sensor, and the calculation formula is as follows:

[0027]

[0028] Among them, θ ij is the inclination angle of the foundation base, S is the vertical settlement distance of the foundation base, ΔL ij is the strain of the j-th fiber Bragg grating sensor.

[0029] Optionally, the transformer foundation monitoring method further includes:

[0030] monitoring a settlement velocity of the foundation base based on a vertical settlement distance of the foundation base;

[0031] monitoring the strain velocity of the fiber Bragg grating sensor based on the strain amount of the fiber Bragg grating sensor;

[0032] monitoring a tilting speed of the base base based on a tilting angle of the base base;

[0033] Determine whether the vertical settlement distance of the foundation base is greater than a preset settlement distance, whether the settlement speed is greater than a preset settlement speed, whether the strain is greater than a preset strain, whether the strain speed is greater than a preset strain speed, whether the tilt angle is greater than a preset angle, and whether the tilt speed is greater than a preset tilt speed;

[0034] When the vertical settlement distance of the base is greater than the preset settlement distance, the settlement speed is greater than the preset settlement speed, the strain amount is greater than the preset strain amount, the strain speed is greater than the preset strain speed, the tilt angle is greater than the preset angle, or the tilt speed is greater than the preset tilt speed, a warning signal is sent to the user terminal.

[0035] In a second aspect, the present invention further provides a transformer foundation base monitoring device, wherein fiber Bragg grating sensors are provided on the periphery and center of the foundation base, and the device comprises:

[0036] a wavelength acquisition module, configured to acquire the wavelength of the laser signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, wherein the plurality of fiber Bragg grating sensors are coupled in series, the current fiber Bragg grating sensor receives the laser signal transmitted by the previous fiber Bragg grating sensor, reflects the laser signal to the previous fiber Bragg grating sensor, and sends the transmitted laser signal to the next fiber Bragg grating sensor, and the laser receiver determines the wavelength of the laser signal reflected by each fiber Bragg grating sensor based on the received laser signal;

[0037] a settlement distance calculation module, configured to calculate the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor;

[0038] a strain calculation module, configured to calculate the strain of the fiber Bragg grating sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base;

[0039] The tilt angle calculation module is used to calculate the tilt angle of the basic base based on the vertical settlement distance of the basic base and the strain of the fiber grating sensor.

[0040] In a third aspect, the present invention further provides an electronic device, comprising:

[0041] one or more processors;

[0042] a storage device for storing one or more programs;

[0043] When the one or more programs are executed by the one or more processors, the one or more processors implement the transformer foundation base monitoring method provided in the first aspect of the present invention.

[0044] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the transformer foundation base monitoring method provided in the first aspect of the present invention.

[0045] The present invention provides a transformer foundation monitoring method, in which fiber grating sensors are provided on the periphery and center of the foundation, and the method comprises: obtaining the wavelength of a laser signal reflected by each fiber grating sensor uploaded by a laser receiver, wherein a plurality of fiber grating sensors are coupled in series, a current fiber grating sensor receives the laser signal transmitted by a previous fiber grating sensor, reflects the laser signal to the previous fiber grating sensor, and sends the transmitted laser signal to a subsequent fiber grating sensor, the laser receiver determines the wavelength of the laser signal reflected by each fiber grating sensor based on the received laser signal, calculates the vertical settlement distance of the foundation based on the wavelength of the laser signal reflected by the fiber grating sensor at the center of the foundation and the intrinsic properties of each fiber grating sensor, calculates the strain of the fiber grating sensor based on the wavelength of the laser signal reflected by the fiber grating sensor at the periphery of the foundation, and calculates the inclination angle of the foundation based on the vertical settlement distance of the foundation and the strain of the fiber grating sensor. The transformer foundation base monitoring method of the present invention uses multiple fiber grating sensors to simultaneously monitor multiple parameters such as settlement, tilt and displacement, providing a comprehensive view of the status of the substation transformer foundation base, improving monitoring accuracy and the timeliness of abnormal alarms.

[0046] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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.

[0048] Figure 1 A flowchart of a transformer foundation base monitoring method provided by an embodiment of the present invention;

[0049] Figure 2 Schematic diagram of the arrangement of a fiber Bragg grating sensor in an embodiment of the present invention;

[0050] Figure 3 A schematic structural diagram of a transformer foundation base monitoring device provided by an embodiment of the present invention;

[0051] Figure 4 A schematic structural diagram of an electronic device provided by an embodiment of the present invention.

[0052] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the description 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 numbers 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] Figure 1 This is a flowchart of a transformer foundation base monitoring method provided by an embodiment of the present invention. This embodiment is applicable to monitoring the settlement and tilt of the transformer foundation base. The method can be executed by the transformer foundation base monitoring device provided by an embodiment of the present invention. The device can be implemented by software and / or hardware and is usually configured in an electronic device, such as Figure 1 As shown, the transformer foundation base monitoring method may include the following steps:

[0056] S101: Acquire the wavelength of the laser signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver.

[0057] Figure 2FIG. 1 is a schematic diagram of the arrangement of the fiber Bragg grating sensor in an embodiment of the present invention, as shown in FIG. Figure 2 As shown, multiple fiber Bragg grating sensors are coupled in series. The current fiber Bragg grating sensor receives the laser signal transmitted by the previous fiber Bragg grating sensor, reflects the laser signal to the previous fiber Bragg grating sensor, and sends the transmitted laser signal to the next fiber Bragg grating sensor. The laser receiver determines the wavelength of the laser signal reflected by each fiber Bragg grating sensor based on the received laser signal. For example, Figure 2 As shown, the top view of the base is rectangular, and fiber grating sensors are set at the four corners of the base. The fiber grating sensors set at the four corners of the base are placed horizontally, and the fiber grating sensor at the center of the base is placed vertically. The laser transmission path starts from one of the fiber grating sensors at the four corners of the base, passes through the fiber grating sensors at the other three corners, and reaches the fiber grating sensor at the center of the base. For example, Figure 2 As shown, the laser transmission path is transmitted along paths 1, 2, 3, 4, and 5, and the first fiber grating sensor, the second fiber grating sensor, the third fiber grating sensor, the fourth fiber grating sensor, and the fifth fiber grating sensor are respectively provided at 1, 2, 3, 4, and 5.

[0058] Specifically, after the construction of the substation is completed, the fiber grating sensors can be laid around the foundation to form a ring or rectangle. The layout is as follows: Figure 2 As shown. It should be noted that the sensor layout can adopt various forms. For example, rectangular, cross, center point layout, perpendicular to the base layout, etc., the embodiment of the present invention is not limited here. For ease of understanding, a ring is used in this example.

[0059] Fiber Bragg sensor (FBG sensor) is a type of fiber optic sensor. The sensing process based on FBG is to obtain sensing information by modulating the Bragg wavelength of the fiber by external physical parameters. It is a wavelength-modulated fiber optic sensor. FBG sensor can directly measure physical quantities such as temperature and strain. Specifically, the FBG sensor has an initial reflection wavelength. When the light wave passes through the FBG, it will reflect back a narrowband light of a specific wavelength. The wavelength of the narrowband light depends on the grating pitch (grating period) of the FBG. When the grating period of the FBG sensor changes due to temperature and strain, the wavelength response of the reflected light wave also changes. Therefore, there is a corresponding relationship between the wavelength λ of the reflected light of the FBG sensor and physical quantities such as temperature, force, and length. This is the basic principle of FBG sensing technology.

[0060] In an embodiment of the present invention, the base may be provided with a laser receiver, which receives the laser reflected by each fiber grating sensor, determines the wavelength of the laser signal reflected by each fiber grating sensor, and then uploads the wavelength to the processing unit.

[0061] For example, in some embodiments of the present invention, Figure 2 As shown, the basic base is also provided with a fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain, which are respectively a first fiber Bragg grating sensor, a second fiber Bragg grating sensor, a third fiber Bragg grating sensor, a fourth fiber Bragg grating sensor, a fifth fiber Bragg grating sensor and a sixth fiber Bragg grating sensor according to the laser transmission path. Among them, the fiber Bragg grating sensor at the center of the basic base is the fifth fiber Bragg grating sensor, and the fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain is the sixth fiber Bragg grating sensor.

[0062] Points 1, 2, 3, and 4 serve as monitoring points for transformer foundation tilt. At point 5, the center of the foundation, a fiber Bragg grating (FBG) sensor is embedded perpendicular to the ground surface to monitor foundation settlement. To eliminate temperature-induced wavelength changes in reflected light, a fiber Bragg grating (FBG) sensor insensitive to displacement (or settlement, tilt) is selected and deployed at point 6 for temperature compensation. To prevent data loss due to failure of a fiber Bragg grating sensor, additional sensors can be added based on the layout, but this is not limited in this embodiment. A laser diode is installed at point 0, the headend, to transmit optical signals. Its power supply is connected to the maintenance power box. Because the power supply in the maintenance power box within the substation is derived from the station power supply, which is a dual-purpose configuration, this power connection method provides a stable and reliable power source for the light source. If power reliability requirements cannot be met during application, an uninterruptible power supply (UPS) can be installed separately. A laser receiver is installed at point 0, the headend, which converts the received optical signal into an electrical signal and transmits it to the processing unit.

[0063] S102: Calculate the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor.

[0064] In an embodiment of the present invention, the vertical settlement distance of the base is calculated based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor.

[0065] In an embodiment of the present invention, in order to eliminate the influence of temperature factors on the monitoring results, the wavelength of the laser signal reflected by the sixth fiber grating sensor is used as the first wavelength of the reflected light caused by the basic temperature change, and the difference between the wavelength of the laser signal reflected by the fifth fiber grating sensor and the first wavelength is calculated to obtain the second wavelength representing the reflected light caused by the settlement change, and then the vertical settlement distance of the base is calculated based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor.

[0066] Specifically, the vertical settlement distance of the base is calculated based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor. The calculation formula is as follows:

[0067]

[0068] Where S represents the vertical settlement distance of the foundation base, Λ V is the second wavelength, λ B5 is the initial reflection wavelength of the fifth fiber Bragg grating sensor, L5 is the effective length of the fifth fiber Bragg grating sensor, P e is the photoelastic coefficient, α is the strain sensitivity of the optical fiber, that is, the proportional coefficient between wavelength change and strain. V =λ 45 -Λ T , Λ T =λ 56 ,λ 56 is the wavelength of the laser reflected by the sixth fiber Bragg grating sensor, λ 45 is the wavelength of the laser reflected by the fifth fiber Bragg grating sensor, Λ T is the first wavelength.

[0069] S103 : Calculate the strain of the fiber Bragg grating sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base.

[0070] In an embodiment of the present invention, the strain amount of the fiber Bragg grating sensor at the periphery of the base base is calculated based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base base.

[0071] Specifically, the difference between the wavelength of the laser signal reflected by the jth fiber Bragg grating sensor and the first wavelength is calculated to obtain a third wavelength, where j = 1, 2, 3 or 4. The difference between the third wavelength and the second wavelength is calculated to obtain a fourth wavelength representing the reflected light caused by the tilt of the base around the base. The strain of the jth fiber Bragg grating sensor is calculated based on the fourth wavelength and the intrinsic properties of the jth fiber Bragg grating sensor.

[0072] Specifically, the calculation formula for the fourth wavelength is:

[0073] Λ ij =λ ij -ΛV -Λ T i,j=1,2,3,4 and i≠j

[0074] Among them, λ ij is the wavelength of the laser signal reflected by the j-th fiber Bragg grating sensor.

[0075] The calculation formula of the strain of the j-th fiber Bragg grating sensor is:

[0076]

[0077] Where, ΔL ij is the strain of the j-th fiber Bragg grating sensor, Λ ij is the fourth wavelength, λ Bj is the initial reflection wavelength of the jth fiber Bragg grating sensor, L ij is the effective length of the jth fiber Bragg grating sensor, P e is the photoelastic coefficient, and α is the strain sensitivity of the optical fiber, that is, the proportional coefficient between wavelength change and strain.

[0078] S104: Calculate the inclination angle of the base based on the vertical settlement distance of the base and the strain of the fiber grating sensor.

[0079] After obtaining the vertical settlement distance of the foundation base and the strain of the fiber grating sensor, the inclination angle around the foundation base can be calculated using the following formula.

[0080]

[0081] Among them, θ ij is the inclination angle of the edge of the foundation base where the fiber Bragg grating sensor is located, S is the vertical settlement distance of the foundation base, ΔL ij is the strain of the j-th fiber Bragg grating sensor.

[0082] In an embodiment of the present invention, in order to consider both the absolute value and the rate of change of the monitored parameters in a real-time monitoring system, the present invention introduces two sets of safety thresholds: one for the absolute value of the parameter and the other for the rate of change of the parameter. In this way, the system can warn of both immediate dangerous conditions and potential risks that may be foreshadowed by rapid changes. Definition of absolute safety threshold: S max ,θ max 、L max ; Safety threshold of change speed: Since the laser emitter emits light signals every moment, the settlement, displacement, and tilt data we obtain are a time series, and the interval Δt depends on the sampling frequency f of the light detector. Then, the settlement speed of the foundation base is monitored based on the vertical settlement distance of the foundation base. Strain monitoring based on fiber Bragg grating sensor Strain velocity of fiber Bragg grating sensor Monitor the tilt speed of the foundation based on the tilt angle of the foundation Determine whether the vertical settlement distance of the foundation base is greater than the preset settlement distance S max , Is the sedimentation velocity greater than the preset sedimentation velocity? Is the strain greater than the preset strain L? max , whether the strain speed is greater than the preset strain speed Is the tilt angle greater than the preset angle? Is the tilt speed greater than the preset tilt speed?

[0083] A warning signal is generated to the user terminal when the vertical settlement distance of the foundation base exceeds a preset settlement distance, the settlement velocity exceeds a preset settlement velocity, the strain exceeds a preset strain, the strain velocity exceeds a preset strain velocity, the tilt angle exceeds a preset angle, or the tilt velocity exceeds a preset tilt velocity. In other words, a warning signal is generated to the user terminal as long as any of these exceeds a threshold.

[0084] For example, in an embodiment of the present invention, the monitoring results and alarm signals can also be transmitted to the unit's internal server through an intranet switch via an encryption algorithm (such as AES128). At the same time, they will be transmitted to the alarm room and office in the substation through the switch. In this way, the staff in the substation can receive the alarm signal as soon as possible and take effective measures in a timely manner. In addition, the monitoring results and alarm signals can also be archived for easy subsequent tracing. The transformer foundation status information data in the memory is read in the internal office system to display real-time data and historical trends, as well as any alarms or abnormal conditions. Based on the monitoring data, maintenance personnel can evaluate the condition of the substation transformer foundation and take maintenance or reinforcement measures when necessary. Through this process, the fiber optic sensor system can provide continuous and real-time monitoring of the substation transformer foundation to ensure its stability and safety. The advantages of this monitoring technology are its high sensitivity, strong anti-electromagnetic interference ability, and reliability suitable for harsh environmental conditions.

[0085] An embodiment of the present invention provides a transformer foundation monitoring method, in which fiber Bragg grating sensors are provided on the periphery and center of the foundation, and the method includes: obtaining the wavelength of a laser signal reflected by each fiber Bragg grating sensor uploaded by a laser receiver, wherein a plurality of fiber Bragg grating sensors are coupled in series, a current fiber Bragg grating sensor receives the laser signal transmitted by a previous fiber Bragg grating sensor, reflects the laser signal to the previous fiber Bragg grating sensor, and sends the transmitted laser signal to a subsequent fiber Bragg grating sensor; the laser receiver determines the wavelength of the laser signal reflected by each fiber Bragg grating sensor based on the received laser signal; the vertical settlement distance of the foundation base is calculated based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the foundation base and the intrinsic properties of each fiber Bragg grating sensor; the strain of the fiber Bragg grating sensor is calculated based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the foundation base; and the inclination angle of the foundation base is calculated based on the vertical settlement distance of the foundation base and the strain of the fiber Bragg grating sensor. The transformer foundation base monitoring method of the embodiment of the present invention uses multiple fiber grating sensors to simultaneously monitor multiple parameters such as settlement, tilt and displacement, providing a comprehensive view of the status of the substation transformer foundation base, improving monitoring accuracy and the timeliness of abnormal alarms.

[0086] The embodiment of the present invention further provides a transformer foundation base monitoring device, wherein fiber grating sensors are provided on the periphery and center of the foundation base. Figure 3 A schematic diagram of the structure of a transformer foundation base monitoring device provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown in the figure, the transformer foundation base monitoring device includes:

[0087] a wavelength acquisition module 201 for acquiring the wavelength of the laser signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, wherein a plurality of fiber Bragg grating sensors are coupled in series, a current fiber Bragg grating sensor receives the laser signal transmitted by the previous fiber Bragg grating sensor, reflects the laser signal to the previous fiber Bragg grating sensor, and sends the transmitted laser signal to the next fiber Bragg grating sensor, and the laser receiver determines the wavelength of the laser signal reflected by each fiber Bragg grating sensor based on the received laser signal;

[0088] A settlement distance calculation module 202 is configured to calculate the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor;

[0089] a strain calculation module 203 for calculating the strain of the fiber Bragg grating sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base;

[0090] The tilt angle calculation module 204 is configured to calculate the tilt angle of the base based on the vertical settlement distance of the base and the strain of the fiber grating sensor.

[0091] In some embodiments of the present invention, fiber grating sensors are provided at the four corners of the basic base, the fiber grating sensors provided at the four corners of the basic base are placed horizontally, and the fiber grating sensor at the center of the basic base is placed vertically, and the laser transmission path is from one of the fiber grating sensors at the four corners of the basic base through the fiber grating sensors at the other three corners to the fiber grating sensor at the center of the basic base.

[0092] In some embodiments of the present invention, a fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain is further provided on the basic base, which are respectively a first fiber Bragg grating sensor, a second fiber Bragg grating sensor, a third fiber Bragg grating sensor, a fourth fiber Bragg grating sensor, a fifth fiber Bragg grating sensor and a sixth fiber Bragg grating sensor according to the laser transmission path. Among them, the fiber Bragg grating sensor at the center of the basic base is the fifth fiber Bragg grating sensor, and the fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain is the sixth fiber Bragg grating sensor.

[0093] In some embodiments of the present invention, the settlement distance calculation module 202 includes:

[0094] a first wavelength calculation submodule, configured to use the wavelength of the laser signal reflected by the sixth fiber Bragg grating sensor as the first wavelength of the reflected light caused by the basic temperature change;

[0095] a second wavelength calculation submodule, configured to calculate a difference between a wavelength of the laser signal reflected by the fifth fiber Bragg grating sensor and the first wavelength, to obtain a second wavelength representing the reflected light caused by the sedimentation change;

[0096] The settlement distance calculation submodule is used to calculate the vertical settlement distance of the base based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor.

[0097] In some embodiments of the present invention, the vertical settlement distance of the base is calculated based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor, and the calculation formula is as follows:

[0098]

[0099] Wherein, S represents the vertical settlement distance of the foundation base, Λ V is the second wavelength, λ B5 is the initial reflection wavelength of the fifth fiber Bragg grating sensor, L5 is the effective length of the fifth fiber Bragg grating sensor, P eis the photoelastic coefficient, and α is the strain sensitivity of the optical fiber, that is, the proportional coefficient between wavelength change and strain.

[0100] In some embodiments of the present invention, the strain calculation module 203 includes:

[0101] a third wavelength calculation submodule, configured to calculate a difference between the wavelength of the laser signal reflected by the j-th fiber Bragg grating sensor and the first wavelength to obtain a third wavelength, wherein j=1, 2, 3 or 4;

[0102] a fourth wavelength calculation submodule, configured to calculate a difference between the third wavelength and the second wavelength to obtain a fourth wavelength representing reflected light caused by the tilt of the base;

[0103] The strain calculation submodule is configured to calculate the strain of the jth fiber Bragg grating sensor based on the fourth wavelength and the intrinsic properties of the jth fiber Bragg grating sensor.

[0104] In some embodiments of the present invention, the strain of the j-th fiber Bragg grating sensor is calculated based on the fourth wavelength and the intrinsic properties of the j-th fiber Bragg grating sensor, and the calculation formula is as follows:

[0105]

[0106] Where, ΔL ij is the strain of the jth fiber Bragg grating sensor, Λ ij is the fourth wavelength, λ Bj is the initial reflection wavelength of the jth fiber Bragg grating sensor, L ij is the effective length of the jth fiber Bragg grating sensor, P e is the photoelastic coefficient, and α is the strain sensitivity of the optical fiber, that is, the proportional coefficient between wavelength change and strain.

[0107] In some embodiments of the present invention, the inclination angle of the base is calculated based on the vertical settlement distance of the base and the strain of the fiber Bragg grating sensor, and the calculation formula is as follows:

[0108]

[0109] Among them, θ ij is the inclination angle of the foundation base, S is the vertical settlement distance of the foundation base, ΔL ij is the strain of the j-th fiber Bragg grating sensor.

[0110] In some embodiments of the present invention, the transformer foundation monitoring device further includes:

[0111] A settlement velocity monitoring module, configured to monitor the settlement velocity of the foundation base based on a vertical settlement distance of the foundation base;

[0112] A strain velocity monitoring module, configured to monitor the strain velocity of the fiber Bragg grating sensor based on the strain amount of the fiber Bragg grating sensor;

[0113] a tilt speed monitoring module, configured to monitor the tilt speed of the base base based on the tilt angle of the base base;

[0114] a judgment module, configured to judge whether the vertical settlement distance of the foundation base is greater than a preset settlement distance, whether the settlement speed is greater than a preset settlement speed, whether the strain amount is greater than a preset strain amount, whether the strain speed is greater than a preset strain speed, whether the tilt angle is greater than a preset angle, and whether the tilt speed is greater than a preset tilt speed;

[0115] The alarm module is used to send a warning signal to the user terminal when the vertical settlement distance of the base is greater than the preset settlement distance, the settlement speed is greater than the preset settlement speed, the strain is greater than the preset strain, the strain speed is greater than the preset strain speed, the inclination angle is greater than the preset angle, or the inclination speed is greater than the preset inclination speed.

[0116] The above-mentioned transformer foundation base monitoring device can execute the transformer foundation base monitoring method provided by the above-mentioned embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the transformer foundation base monitoring method.

[0117] Figure 4 A schematic diagram of the structure of an electronic device provided for an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0118] like Figure 4As shown, the electronic device includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0119] Multiple components in the electronic device are connected to the I / O interface 15, including an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0120] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the transformer foundation base monitoring method.

[0121] In some embodiments, the transformer foundation base monitoring method can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the transformer foundation base monitoring method described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the transformer foundation base monitoring method via any other suitable means (e.g., via firmware).

[0122] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0123] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0124] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0125] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0126] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0127] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0128] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the transformer foundation base monitoring method provided in any embodiment of the present application.

[0129] The computer program product may be implemented by writing computer program code for performing the operations of the present invention in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0130] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0131] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A transformer foundation monitoring method, characterized in that: Fiber Bragg grating sensors are provided on the periphery and center of the base, and the method includes: Acquiring the wavelength of the laser signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, wherein the multiple fiber Bragg grating sensors are coupled in series, the current fiber Bragg grating sensor receives the laser signal transmitted by the previous fiber Bragg grating sensor, reflects the laser signal to the previous fiber Bragg grating sensor, and sends the transmitted laser signal to the next fiber Bragg grating sensor, and the laser receiver determines the wavelength of the laser signal reflected by each fiber Bragg grating sensor based on the received laser signal; Calculating the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor; Calculating the strain of the fiber Bragg grating sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base; The tilt angle of the base is calculated based on the vertical settlement distance of the base and the strain of the fiber grating sensor.

2. The transformer foundation monitoring method according to claim 1, characterized in that: Fiber Bragg grating sensors are provided at the four corners of the basic base. The fiber Bragg grating sensors provided at the four corners of the basic base are placed horizontally, and the fiber Bragg grating sensor at the center of the basic base is placed vertically. The laser transmission path is from one of the fiber Bragg grating sensors at the four corners of the basic base through the fiber Bragg grating sensors at the other three corners to the fiber Bragg grating sensor at the center of the basic base.

3. The transformer foundation monitoring method according to claim 2, characterized in that: The basic base is also provided with a fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain, which are respectively a first fiber Bragg grating sensor, a second fiber Bragg grating sensor, a third fiber Bragg grating sensor, a fourth fiber Bragg grating sensor, a fifth fiber Bragg grating sensor and a sixth fiber Bragg grating sensor according to the laser transmission path. Among them, the fiber Bragg grating sensor at the center of the basic base is the fifth fiber Bragg grating sensor, and the fiber Bragg grating sensor that is sensitive to temperature and insensitive to strain is the sixth fiber Bragg grating sensor.

4. The transformer foundation monitoring method according to claim 3, characterized in that: Calculating the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor includes: using the wavelength of the laser signal reflected by the sixth fiber grating sensor as the first wavelength of the reflected light caused by the basic temperature change; Calculating a difference between a wavelength of the laser signal reflected by the fifth fiber Bragg grating sensor and the first wavelength to obtain a second wavelength representing reflected light caused by sedimentation change; The vertical settlement distance of the base is calculated based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor.

5. The transformer foundation monitoring method according to claim 4, characterized in that: The vertical settlement distance of the base is calculated based on the second wavelength and the intrinsic properties of the fifth fiber grating sensor, and the calculation formula is as follows: in, represents the vertical settlement distance of the foundation base, is the second wavelength, is the initial reflection wavelength of the fifth fiber Bragg grating sensor, is the effective length of the fifth fiber Bragg grating sensor, is the photoelastic coefficient, is the strain sensitivity of the optical fiber, that is, the proportional coefficient of wavelength change to strain.

6. The transformer foundation monitoring method according to any one of claims 3 to 5, characterized in that: Calculating the strain of the fiber Bragg grating sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base includes: Calculating the difference between the wavelength of the laser signal reflected by the j-th fiber Bragg grating sensor and the first wavelength to obtain a third wavelength, where j=1, 2, 3 or 4; Calculating a difference between the third wavelength and the second wavelength to obtain a fourth wavelength representing reflected light caused by the tilt of the base; The strain amount of the jth fiber Bragg grating sensor is calculated based on the fourth wavelength and an intrinsic property of the jth fiber Bragg grating sensor.

7. The transformer foundation monitoring method according to claim 6, characterized in that: The strain of the j-th fiber Bragg grating sensor is calculated based on the fourth wavelength and the intrinsic properties of the j-th fiber Bragg grating sensor. The calculation formula is as follows: in, is the strain of the j-th fiber Bragg grating sensor, is the fourth wavelength, is the initial reflection wavelength of the j-th fiber Bragg grating sensor, is the effective length of the j-th fiber Bragg grating sensor, is the photoelastic coefficient, is the strain sensitivity of the optical fiber, that is, the proportional coefficient of wavelength change to strain.

8. The transformer foundation monitoring method according to any one of claims 1 to 5, characterized in that: The inclination angle of the base is calculated based on the vertical settlement distance of the base and the strain of the fiber grating sensor. The calculation formula is as follows: in, is the inclination angle of the base, is the vertical settlement distance of the foundation base, is the strain of the j-th fiber Bragg grating sensor.

9. The transformer foundation monitoring method according to any one of claims 1 to 5, characterized in that: Also includes: monitoring a settlement velocity of the foundation base based on a vertical settlement distance of the foundation base; monitoring the strain velocity of the fiber Bragg grating sensor based on the strain amount of the fiber Bragg grating sensor; monitoring a tilting speed of the base base based on a tilting angle of the base base; Determine whether the vertical settlement distance of the foundation base is greater than a preset settlement distance, whether the settlement speed is greater than a preset settlement speed, whether the strain is greater than a preset strain, whether the strain speed is greater than a preset strain speed, whether the tilt angle is greater than a preset angle, and whether the tilt speed is greater than a preset tilt speed; When the vertical settlement distance of the base is greater than the preset settlement distance, the settlement speed is greater than the preset settlement speed, the strain amount is greater than the preset strain amount, the strain speed is greater than the preset strain speed, the tilt angle is greater than the preset angle, or the tilt speed is greater than the preset tilt speed, a warning signal is sent to the user terminal.

10. A transformer foundation monitoring device, characterized in that: Fiber Bragg grating sensors are installed on the periphery and center of the base. The device includes: a wavelength acquisition module, configured to acquire the wavelength of the laser signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, wherein the plurality of fiber Bragg grating sensors are coupled in series, the current fiber Bragg grating sensor receives the laser signal transmitted by the previous fiber Bragg grating sensor, reflects the laser signal to the previous fiber Bragg grating sensor, and sends the transmitted laser signal to the next fiber Bragg grating sensor, and the laser receiver determines the wavelength of the laser signal reflected by each fiber Bragg grating sensor based on the received laser signal; a settlement distance calculation module, configured to calculate the vertical settlement distance of the base based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the center of the base and the intrinsic properties of each fiber Bragg grating sensor; a strain calculation module, configured to calculate the strain of the fiber Bragg grating sensor based on the wavelength of the laser signal reflected by the fiber Bragg grating sensor at the periphery of the base; The tilt angle calculation module is used to calculate the tilt angle of the basic base based on the vertical settlement distance of the basic base and the strain of the fiber grating sensor.

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