Temperature monitoring alarm method and system for fiber grating sensor

Abstract

The present disclosure provides a temperature monitoring alarm method and system for a fiber grating sensor, which relates to the field of intelligent temperature monitoring technology. The method includes: obtaining a contact structure, including an upper contact and a lower contact; using a first fiber grating sensor to collect temperature, outputting an upper contact temperature monitoring signal, using a second sensor to collect temperature, and outputting a lower contact temperature monitoring signal; outputting an upper contact temperature value and a lower contact temperature value through a temperature demodulation module; inputting the upper contact temperature value and the lower contact temperature value into a contact form-alarm matching module for temperature matching, and obtaining a disconnection signal if the matching degree meets a preset matching degree. The present disclosure can solve the technical problem of low accuracy of temperature monitoring alarms due to the inability to accurately obtain temperature monitoring data on disconnector contacts of different structures, and can improve the accuracy of temperature monitoring data acquisition, so that the circuit breaker can be controlled to cut off the power supply in a timely and effective manner.

Description

Technical Field

[0001] The present disclosure relates to the technical field of intelligent temperature monitoring, and in particular to a temperature monitoring alarm method and system for a fiber grating sensor. Background Art

[0002] There are more and more accidents related to contact heating failures in disconnectors due to increased load in the power system and frequent use. At the same time, existing contact temperature detection products are mostly contact-type installations, which are easily damaged under high current and high voltage, and require manual operation and confirmation after detection, resulting in poor installation efficiency. Therefore, the remote measurement characteristics of fiber grating sensors can be used for precise temperature measurement to improve the accuracy and timeliness of circuit power disconnection control.

[0003] However, when the temperature of the disconnector contacts is currently monitored by fiber grating sensors, due to the structural diversity of the disconnector contacts, the positions of the heat source center points are different, resulting in the inability to accurately obtain temperature monitoring data on disconnector contacts with different structures, making the accuracy of temperature alarm judgment low.

[0004] In summary, the existing method of temperature monitoring and alarming of disconnector contacts through fiber grating sensors is unable to accurately obtain temperature monitoring data on disconnector contacts with different structures, resulting in low accuracy of temperature monitoring and alarming. Therefore, it is impossible to take timely measures to cut off the power supply when the disconnector contacts are overheated, resulting in technical problems such as poor safety of power grid operation. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature monitoring and alarm method and system for fiber grating sensors, so as to solve the technical problem that the existing method of temperature monitoring and alarming of disconnecting switch contacts through fiber grating sensors cannot accurately obtain temperature monitoring data on disconnecting switch contacts with different structures, resulting in low accuracy of temperature monitoring and alarming. Therefore, it is impossible to take timely measures to cut off the power supply when the disconnecting switch contacts are overheated, resulting in poor safety of power grid operation.

[0006] In view of the above problems, the present disclosure provides a temperature monitoring and alarm method and system for a fiber grating sensor.

[0007] In a first aspect, the present disclosure provides a temperature monitoring and alarm method for a fiber grating sensor, the method being implemented by a temperature monitoring and alarm system for a fiber grating sensor, wherein the method comprises: obtaining a temperature sensing probe, wherein a first fiber grating sensor and a second fiber grating sensor are provided in the temperature sensing probe, and the temperature sensing probe is arranged at a closing position of a target circuit switch; obtaining a contact structure at the closing position of the target circuit switch, wherein the contact structure comprises an upper contact and a lower contact; based on the contact structure, using the first fiber grating sensor to collect a temperature signal of the contact, Output an upper contact temperature monitoring signal, use the second fiber grating sensor to collect the temperature signal of the contact, and output a lower contact temperature monitoring signal; input the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module, and use the temperature demodulation module to output the upper contact temperature value and the lower contact temperature value; input the upper contact temperature value and the lower contact temperature value into a pre-packaged contact form-alarm matching module, perform temperature matching according to the contact form-alarm matching module, and if the matching degree meets the preset matching degree, obtain a disconnect signal for disconnecting the power supply of the target circuit.

[0008] In a second aspect, the present disclosure further provides a temperature monitoring and alarm system for a fiber grating sensor, which is used to execute a temperature monitoring and alarm method for a fiber grating sensor as described in the first aspect, wherein the system comprises: a temperature sensing probe acquisition module, the temperature sensing probe acquisition module is used to acquire a temperature sensing probe, the temperature sensing probe is provided with a first fiber grating sensor and a second fiber grating sensor, and the temperature sensing probe is arranged at the closing position of the target circuit switch; a contact structure acquisition module, the contact structure acquisition module is used to acquire the contact structure of the target circuit switch at the closing position, the contact structure includes an upper contact and a lower contact; a temperature signal acquisition module, the temperature signal acquisition module is used to acquire the temperature signal of the first fiber grating based on the contact structure. The fiber grating sensor collects temperature signals of the contacts and outputs an upper contact temperature monitoring signal, and the second fiber grating sensor collects temperature signals of the contacts and outputs a lower contact temperature monitoring signal; a temperature value output module, the temperature value output module is used to input the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module, and the temperature demodulation module outputs the upper contact temperature value and the lower contact temperature value; a disconnection signal acquisition module, the disconnection signal acquisition module is used to input the upper contact temperature value and the lower contact temperature value into a pre-packaged contact form-alarm matching module, and perform temperature matching according to the contact form-alarm matching module. If the matching degree meets the preset matching degree, a disconnection signal is obtained to disconnect the power supply of the target circuit.

[0009] One or more technical solutions provided in this disclosure have at least the following technical effects or advantages:

[0010] By acquiring a temperature sensing probe, wherein a first fiber grating sensor and a second fiber grating sensor are provided in the temperature sensing probe, and the temperature sensing probe is arranged at the closing position of the target circuit switch; acquiring a contact structure at the closing position of the target circuit switch, wherein the contact structure comprises an upper contact and a lower contact; based on the contact structure, using the first fiber grating sensor to collect temperature signals of the contacts, and outputting an upper contact temperature monitoring signal, and using the second fiber grating sensor to collect temperature signals of the contacts, and outputting a lower contact temperature monitoring signal; inputting the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module, and using the temperature demodulation module to output an upper contact temperature value and a lower contact temperature value; inputting the upper contact temperature value and the lower contact temperature value into a pre-packaged contact form-alarm matching module, and performing temperature matching according to the contact form-alarm matching module, and if the matching degree meets the preset matching degree, obtaining a disconnection signal for disconnecting the power supply of the target circuit. In other words, by conducting a detailed analysis of the temperature change characteristics of different isolating switch contact structures, the accuracy of temperature monitoring data acquisition can be improved, and the accuracy of fiber grating sensor temperature monitoring alarms can be further improved, thereby achieving the technical effect of timely and effective control of circuit breakers to cut off power supply and ensure the safe operation of the power grid.

[0011] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. 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 disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the present disclosure or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0013] Figure 1 A schematic diagram of a flow chart of a temperature monitoring and alarm method for a fiber grating sensor disclosed in the present invention;

[0014] Figure 2This is a flow chart of outputting the upper contact temperature value and the lower contact temperature value by the temperature demodulation module in a temperature monitoring and alarm method for a fiber Bragg grating sensor disclosed in the present invention;

[0015] Figure 3 The present invention discloses a structural schematic diagram of a temperature monitoring and alarm system for a fiber grating sensor.

[0016] Description of reference numerals:

[0017] A temperature sensing probe acquisition module 11 , a contact structure acquisition module 12 , a temperature signal acquisition module 13 , a temperature value output module 14 , and a disconnection signal acquisition module 15 . DETAILED DESCRIPTION

[0018] The present disclosure provides a temperature monitoring alarm method and system for fiber Bragg grating sensors, which solves the existing method of temperature monitoring alarm for disconnector contacts through fiber Bragg grating sensors. Since the temperature monitoring data on disconnector contacts with different structures cannot be accurately obtained, the accuracy of temperature monitoring alarm is low, so it is impossible to take timely measures to cut off the power supply when the disconnector contacts are overheated, resulting in a technical problem of poor safety of power grid operation. By finely analyzing the temperature change characteristics of different disconnector contact structures, the accuracy of temperature monitoring data acquisition can be improved, and the accuracy of fiber Bragg grating sensor temperature monitoring alarm can be further improved, thereby achieving the technical effect of timely and effective control of circuit breakers to cut off power supply and ensuring safe operation of the power grid.

[0019] Below, the technical solutions in the present disclosure will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments of the present disclosure. It should be understood that the present disclosure is not limited to the example embodiments described herein. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure. It should also be noted that, for the convenience of description, only the parts related to the present disclosure are shown in the accompanying drawings, rather than all of them.

[0020] Embodiment 1

[0021] Please refer to the attached Figure 1 The present disclosure provides a temperature monitoring alarm method for a fiber Bragg grating sensor, wherein the method is applied to a temperature monitoring alarm system for a fiber Bragg grating sensor, and the method specifically comprises the following steps:

[0022] Step 1: Obtain a temperature sensing probe, wherein the temperature sensing probe is provided with a first fiber grating sensor and a second fiber grating sensor, and the temperature sensing probe is arranged at the switch closing position of the target circuit;

[0023] Specifically, a temperature sensing probe is obtained, and the temperature sensing probe is used to monitor the contact temperature at the closing point of the target circuit switch, wherein the temperature sensing probe is provided with a first fiber grating sensor and a second fiber grating sensor. The fiber grating sensor is a sensor that measures the temperature of a physical quantity by measuring the transmission characteristics of light waves in an optical fiber. It can realize remote measurement and has multiple advantages such as high sensitivity, anti-interference, and small size.

[0024] Step 2: Obtaining a contact structure at a closing position of the target circuit switch, wherein the contact structure includes an upper contact and a lower contact;

[0025] Specifically, the contact structure at the closing point of the target circuit switch is obtained, wherein the contact structure can be set based on the type and specification of the target circuit switch, wherein the contact structure includes an upper contact and a lower contact, and when the upper contact and the lower contact are combined, the function of connecting / disconnecting the circuit can be realized, wherein the upper contact and the lower contact have various contact forms, including point contact form, line contact form, surface contact form, etc.

[0026] Step 3: Based on the contact structure, using the first fiber grating sensor to collect temperature signals of the contact, outputting an upper contact temperature monitoring signal, and using the second fiber grating sensor to collect temperature signals of the contact, outputting a lower contact temperature monitoring signal;

[0027] Specifically, based on the contact structure, the temperature signal of the upper contact is collected by the first fiber grating sensor to obtain the upper contact temperature monitoring signal; the temperature signal of the lower contact is collected by the second fiber grating sensor to obtain the lower contact temperature monitoring signal, wherein the temperature monitoring signal is the reflected light signal received by the fiber grating sensor. By obtaining the temperature monitoring signal, data support is provided for the next step of converting the reflected light signal into a temperature digital signal and obtaining the contact temperature value by demodulating the temperature digital signal.

[0028] Step 4: inputting the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module, and outputting an upper contact temperature value and a lower contact temperature value by the temperature demodulation module;

[0029] Specifically, a temperature demodulation module is constructed, and the temperature demodulation module is used to demodulate the received temperature digital signal and output the monitoring temperature value. Then the upper contact temperature monitoring signal and the lower contact temperature monitoring signal are input into the temperature demodulation module, and the upper contact temperature value and the lower contact temperature value are output through the temperature demodulation module, wherein the upper contact temperature value corresponds to the upper contact temperature monitoring signal, and the lower contact temperature value corresponds to the lower contact temperature monitoring signal.

[0030] Step 5: Input the upper contact temperature value and the lower contact temperature value into a pre-packaged contact form-alarm matching module, perform temperature matching according to the contact form-alarm matching module, and if the matching degree meets the preset matching degree, obtain a disconnect signal to disconnect the power supply of the target circuit.

[0031] Specifically, a contact form-alarm matching module is constructed and packaged, wherein the contact form-alarm matching module includes temperature alarm matching models corresponding to multiple contacts of different contact forms. Then, the upper contact temperature value and the lower contact temperature value are input into the pre-packaged contact form-alarm matching module, and then, the upper contact temperature value and the lower contact temperature value are temperature matched according to the temperature alarm matching model in the contact form-alarm matching module to obtain a temperature matching degree.

[0032] A preset matching degree is obtained, and the preset matching degree can be set by a person skilled in the art according to actual conditions. The matching degree is judged according to the preset matching degree. When the matching degree is greater than the preset matching degree, a disconnect signal is obtained, and then a circuit breaker is controlled according to the disconnect signal to automatically cut off the power supply of the target circuit.

[0033] Specifically, the temperature monitoring and alarm method for a fiber Bragg grating sensor is applied to a temperature monitoring and alarm system for a fiber Bragg grating sensor.

[0034] First, a temperature sensing probe is obtained, wherein a first fiber grating sensor and a second fiber grating sensor are provided in the temperature sensing probe, and the temperature sensing probe is arranged at the closing position of the target circuit switch; a contact structure at the closing position of the target circuit switch is obtained, wherein the contact structure comprises an upper contact and a lower contact; then, based on the contact structure, the first fiber grating sensor is used to collect temperature signals of the contacts, and an upper contact temperature monitoring signal is output; the second fiber grating sensor is used to collect temperature signals of the contacts, and a lower contact temperature monitoring signal is output; the upper contact temperature monitoring signal and the lower contact temperature monitoring signal are further input into a temperature demodulation module, and the temperature demodulation module outputs an upper contact temperature value and a lower contact temperature value; finally, the upper contact temperature value and the lower contact temperature value are input into a pre-packaged contact form-alarm matching module, and temperature matching is performed according to the contact form-alarm matching module. If the matching degree meets the preset matching degree, a disconnection signal is obtained to disconnect the power supply of the target circuit.

[0035] By conducting a detailed analysis of the temperature change characteristics of different disconnector contact structures, the accuracy of temperature monitoring data acquisition can be improved, thereby further improving the accuracy of fiber grating sensor temperature monitoring alarms, achieving the technical effect of timely and effectively controlling the circuit breaker to cut off the power supply and ensuring the safe operation of the power grid.

[0036] Further, as attached Figure 2 As shown, step 4 of the present disclosure includes:

[0037] Building a temperature demodulation module, wherein the temperature demodulation module is connected to a signal conversion module, and the signal conversion module is used to convert the reflected light signal of the optical fiber sensor into a temperature digital signal;

[0038] The temperature demodulation module receives the temperature digital signal from the signal conversion module, establishes a demodulation relationship between the wavelength of the temperature digital signal and the real-time temperature value of the host computer acquisition system, uses the demodulation relationship to demodulate the upper contact temperature monitoring signal and the lower contact temperature monitoring signal, and outputs the upper contact temperature value and the lower contact temperature value through the temperature demodulation module.

[0039] Specifically, a temperature demodulation module is constructed, wherein the temperature demodulation module and the signal conversion module can realize data interaction through signal transmission, wherein the signal conversion module is embedded with a photoelectric converter, and the photoelectric converter can convert the reflected light signal of the optical fiber sensor into a temperature digital signal, wherein the working principle of the photoelectric converter is to convert the intensity of light into current or voltage through the photoelectric effect, and in optical fiber communication, the photoelectric converter is usually used to read the optical signal from the optical fiber and convert it into an electrical signal for the next step of processing and transmission.

[0040] The temperature demodulation module receives the temperature digital signal sent by the signal conversion module, and establishes a demodulation relationship between the wavelength of the temperature digital signal and the real-time temperature value of the host computer acquisition system, wherein the demodulation relationship is used to demodulate the temperature digital signal into temperature data, including algorithm processing, data analysis, data visualization display and other steps, and the temperature data can be presented in the form of charts, curves, etc., to help users better understand and analyze temperature changes. Then, the temperature digital signals of the upper contact temperature monitoring signal and the lower contact temperature monitoring signal are demodulated using the demodulation relationship, and then the upper contact temperature value and the lower contact temperature value are output through the temperature demodulation module.

[0041] By constructing a signal conversion module and a temperature demodulation module to convert and demodulate the reflected light signal of the optical fiber sensor, the change of temperature data can be displayed intuitively, providing support for the next step of monitoring temperature analysis.

[0042] Further, step five of the present disclosure includes:

[0043] Determining the contact form of the target circuit switch at the closing position;

[0044] Determine whether the contact form of the contact is an embedded contact form, if the contact form is a non-embedded contact form, wherein the non-embedded contact form includes point contact, surface contact and line contact;

[0045] Perform temperature sample simulation according to the point contact, the surface contact and the line contact to obtain a point contact temperature sample, a surface contact temperature sample and a line contact temperature sample;

[0046] According to the point contact temperature samples, the surface contact temperature samples and the line contact temperature samples, a non-embedded-alarm matching model is trained;

[0047] Specifically, first, determine the contact form of the target circuit switch at the closing position, and the contact form can be set according to the type and specification of the target circuit switch. Then determine whether the contact form is an embedded contact form. When the contact form is a non-embedded contact form, the non-embedded contact form includes a point contact form, a surface contact form, and a line contact form.

[0048] When the contact form of the contact is a non-embedded contact form, temperature sample data are collected according to the point contact, the surface contact and the line contact respectively to obtain point contact temperature samples, surface contact temperature samples and line contact temperature samples, wherein the temperature sample includes multiple temperature sample data.

[0049] The point contact temperature samples, the surface contact temperature samples and the line contact temperature samples are used as sample training data to train the non-embedded-alarm matching model to obtain the non-embedded-alarm matching model, and then the non-embedded-alarm matching model is encapsulated into the contact form-alarm matching module.

[0050] Furthermore, the present disclosure also includes the following steps:

[0051] Feature extraction is performed according to the point contact temperature samples, the surface contact temperature samples and the line contact temperature samples to obtain point contact warning features, surface contact warning features and line contact warning features;

[0052] Among them, each warning feature includes the temperature distribution feature of the upper contact, the temperature rise rate feature of the upper contact, the temperature distribution feature of the lower contact, and the temperature rise rate feature of the lower contact;

[0053] According to the point contact warning feature, the surface contact warning feature and the line contact warning feature, the non-embedded-warning matching model is trained, wherein the non-embedded-warning matching model includes a point contact warning matching channel, a surface contact warning matching channel and a line contact warning matching channel;

[0054] If the contact form is a non-embedded contact form, the upper contact temperature monitoring signal and the lower contact temperature monitoring signal are input into the corresponding alarm matching channel for temperature matching. If the matching degree meets the preset matching degree, a disconnect signal is obtained to disconnect the power supply of the target circuit.

[0055] Specifically, first, feature extraction is performed on the point contact temperature samples, surface contact temperature samples, and line contact temperature samples, respectively. The larger the contact range, the more difficult it is to determine the location of the center point of the heat source, and the more difficult it is to obtain accurate temperature monitoring data, and the point contact warning features, surface contact warning features, and line contact warning features are obtained. Each warning feature includes the temperature distribution feature of the upper contact, the temperature rise rate feature of the upper contact, the temperature distribution feature of the lower contact, and the temperature rise rate feature of the lower contact, wherein the temperature distribution feature includes features such as temperature deviation at different positions; the temperature rise rate feature includes features such as the rise rate and the rise volatility.

[0056] First, a non-embedded-alarm matching model is constructed, wherein the non-embedded-alarm matching model includes a point contact alarm matching channel, a surface contact alarm matching channel, and a line contact alarm matching channel, and then the point contact alarm matching channel is trained through the point contact warning feature, the surface contact alarm matching channel is trained through the surface contact warning feature, and the line contact alarm matching channel is trained through the line contact warning feature. The point contact alarm matching channel, the surface contact alarm matching channel, and the line contact alarm matching channel are feedforward neural network models that can be iteratively optimized in machine learning, and are obtained through supervised training with training data.

[0057] The point contact alarm matching channel, surface contact alarm matching channel, and line contact alarm matching channel that meet the expected training indicators are obtained. The expected training indicators can be set according to actual needs. The higher the required accuracy, the higher the output accuracy indicator in the expected training indicators. Then, an embedded-alarm matching model is established based on the trained point contact alarm matching channel, surface contact alarm matching channel, and line contact alarm matching channel.

[0058] When the contact contact form is a non-embedded contact form, first match the corresponding alarm matching channel in the non-embedded-alarm matching model according to the contact contact form, and input the contact temperature value and the lower contact temperature value obtained by demodulating the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into the corresponding alarm matching channel for temperature matching, and output the temperature matching degree.

[0059] The temperature matching degree is judged according to the preset matching degree, and if the temperature matching degree is greater than the preset matching degree, a disconnection signal is obtained, and the disconnection signal is used to control a circuit breaker to disconnect the power supply of the target circuit.

[0060] Furthermore, the present disclosure also includes the following steps:

[0061] If the contact form is an embedded contact form, obtaining an upper contact temperature sample and a lower contact temperature sample under the embedded contact form;

[0062] Establishing a temperature mapping relationship between the upper contact temperature sample and the lower contact temperature sample to obtain an upper-lower contact temperature mapping data set;

[0063] The upper-lower contact temperature mapping data set is used to train an embedded-alarm matching model, and the embedded-alarm matching model is encapsulated into the contact form-alarm matching module.

[0064] Specifically, when the contact form is an embedded contact form, wherein the embedded contact form means that the upper contact is embedded in the lower contact on the other side, in the embedded contact form, temperature sampling is performed when the switch is opened, and temperature monitoring is performed when the switch is closed, to obtain the upper contact temperature samples and the lower contact temperature samples under the embedded contact form.

[0065] A temperature mapping relationship between the upper contact temperature sample and the lower contact temperature sample is constructed, and the temperature samples are divided based on the temperature mapping relationship to obtain an upper-lower contact temperature mapping data set. An embedded-alarm matching model is constructed, and the upper-lower contact temperature mapping data set is used as training data to train the embedded-alarm matching model, and the trained embedded-alarm matching model is encapsulated into the contact form-alarm matching module.

[0066] Furthermore, the present disclosure also includes the following steps:

[0067] The embedded-alarm matching model outputs a matching upper contact temperature value according to the lower contact temperature value;

[0068] When the matched upper contact temperature value is greater than the preset upper contact temperature value, a disconnection signal is obtained to disconnect the power supply of the target circuit.

[0069] Specifically, when the contact contact form is an embedded contact form, the upper contact temperature value and the lower contact temperature value are input into the embedded-alarm matching model, and the lower contact temperature value is mapped and associated analyzed through the embedded-alarm matching model to output the matching upper contact temperature value.

[0070] A preset upper contact temperature value is obtained, and then the upper contact temperature value is judged according to the preset upper contact temperature value. When the upper contact temperature value is greater than the preset upper contact temperature value, a disconnection signal is obtained, and a circuit breaker is controlled to disconnect the power supply of the target circuit based on the disconnection signal.

[0071] Furthermore, the present disclosure also includes the following steps:

[0072] Sampling and predicting the signal execution process of the disconnect signal to obtain the execution timing;

[0073] An initial upper contact temperature limit is obtained, a temperature error threshold is set according to the execution sequence, and the initial upper contact temperature limit is optimized according to the temperature error threshold, and the optimization result is output as a preset upper contact temperature value.

[0074] Specifically, the method for generating a preset upper contact temperature value is as follows: first, a sample prediction is performed on the signal execution process of the disconnect signal, that is, the time interval from the disconnect signal being sent to the actual execution of the disconnect operation is predicted, and an execution sequence is obtained according to the prediction result, wherein the execution sequence refers to the time period when the disconnect signal is sent for execution.

[0075] The initial upper contact temperature limit is obtained. The initial upper contact temperature limit can be set according to the actual situation. Then, the temperature error threshold is set according to the execution sequence. The temperature error threshold refers to the adjustment range of the temperature limit. The longer the execution sequence is, the greater the temperature change state is, and the greater the temperature error threshold is. Then, the initial upper contact temperature limit is optimized according to the temperature error threshold. Since the monitoring temperature of the upper contact is still gradually rising during the temperature signal transmission process, that is, within the time period of the execution sequence, it is necessary to lower the initial upper contact temperature limit to improve the accuracy of the initial upper contact temperature limit setting, and the optimized initial upper contact temperature limit is used as the preset upper contact temperature value.

[0076] By optimizing and correcting the initial upper contact temperature limit according to the execution sequence, the accuracy and rationality of the preset upper contact temperature value setting can be improved, thereby improving the accuracy of the embedded contact form contact temperature monitoring alarm.

[0077] The non-embedded-alarm matching model is encapsulated into the contact form-alarm matching module.

[0078] Specifically, the non-embedded-alarm matching model is encapsulated into the contact form-alarm matching module to obtain the contact form-alarm matching module, and the contact form-alarm matching module includes the non-embedded-alarm matching model and the embedded-alarm matching model.

[0079] In summary, the temperature monitoring and alarm method for fiber grating sensor provided by the present disclosure has the following technical effects:

[0080] 1. Through the detailed analysis of the temperature change characteristics of different isolating switch contact structures, the accuracy of temperature monitoring data acquisition can be improved, and the accuracy of fiber grating sensor temperature monitoring alarm can be further improved, so that the circuit breaker can be controlled to cut off the power supply in a timely and effective manner to ensure the safe operation of the power grid.

[0081] 2. By optimizing and correcting the initial upper contact temperature limit according to the execution sequence, the accuracy and rationality of the preset upper contact temperature value setting can be improved, thereby improving the accuracy of the embedded contact form contact temperature monitoring alarm.

[0082] Embodiment 2

[0083] Based on the same inventive concept as the temperature monitoring alarm method for a fiber Bragg grating sensor in the aforementioned embodiment, the present disclosure also provides a temperature monitoring alarm system for a fiber Bragg grating sensor, see the attached Figure 3 , the system comprising:

[0084] A temperature sensing probe acquisition module 11, wherein the temperature sensing probe acquisition module 11 is used to acquire a temperature sensing probe, wherein a first fiber grating sensor and a second fiber grating sensor are provided in the temperature sensing probe, and the temperature sensing probe is arranged at a switch-on position of a target circuit;

[0085] A contact structure acquisition module 12, the contact structure acquisition module 12 is used to acquire the contact structure of the target circuit switch at the closing position, the contact structure includes an upper contact and a lower contact;

[0086] A temperature signal acquisition module 13, wherein the temperature signal acquisition module 13 is used to acquire temperature signals of the contact using the first fiber Bragg grating sensor based on the contact structure, and output an upper contact temperature monitoring signal, and to acquire temperature signals of the contact using the second fiber Bragg grating sensor, and output a lower contact temperature monitoring signal;

[0087] A temperature value output module 14, the temperature value output module 14 is used to input the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module, and the temperature demodulation module outputs an upper contact temperature value and a lower contact temperature value;

[0088] A disconnect signal acquisition module 15, wherein the disconnect signal acquisition module 15 is used to input the upper contact temperature value and the lower contact temperature value into a pre-packaged contact form-alarm matching module, perform temperature matching according to the contact form-alarm matching module, and if the matching degree meets the preset matching degree, obtain a disconnect signal for disconnecting the power supply of the target circuit.

[0089] Furthermore, the temperature value output module 14 in the system is also used for:

[0090] Building a temperature demodulation module, wherein the temperature demodulation module is connected to a signal conversion module, and the signal conversion module is used to convert the reflected light signal of the optical fiber sensor into a temperature digital signal;

[0091] The temperature demodulation module receives the temperature digital signal from the signal conversion module, establishes a demodulation relationship between the wavelength of the temperature digital signal and the real-time temperature value of the host computer acquisition system, uses the demodulation relationship to demodulate the upper contact temperature monitoring signal and the lower contact temperature monitoring signal, and outputs the upper contact temperature value and the lower contact temperature value through the temperature demodulation module.

[0092] Furthermore, the temperature value output module 15 in the system is also used for:

[0093] Determining the contact form of the target circuit switch at the closing position;

[0094] Determine whether the contact form of the contact is an embedded contact form, if the contact form is a non-embedded contact form, wherein the non-embedded contact form includes point contact, surface contact and line contact;

[0095] Perform temperature sample simulation according to the point contact, the surface contact and the line contact to obtain a point contact temperature sample, a surface contact temperature sample and a line contact temperature sample;

[0096] According to the point contact temperature samples, the surface contact temperature samples and the line contact temperature samples, a non-embedded-alarm matching model is trained;

[0097] The non-embedded-alarm matching model is encapsulated into the contact form-alarm matching module.

[0098] Furthermore, the temperature value output module 15 in the system is also used for:

[0099] Feature extraction is performed according to the point contact temperature samples, the surface contact temperature samples and the line contact temperature samples to obtain point contact warning features, surface contact warning features and line contact warning features;

[0100] Among them, each warning feature includes the temperature distribution feature of the upper contact, the temperature rise rate feature of the upper contact, the temperature distribution feature of the lower contact, and the temperature rise rate feature of the lower contact;

[0101] According to the point contact warning feature, the surface contact warning feature and the line contact warning feature, the non-embedded-warning matching model is trained, wherein the non-embedded-warning matching model includes a point contact warning matching channel, a surface contact warning matching channel and a line contact warning matching channel;

[0102] If the contact form is a non-embedded contact form, the upper contact temperature monitoring signal and the lower contact temperature monitoring signal are input into the corresponding alarm matching channel for temperature matching. If the matching degree meets the preset matching degree, a disconnect signal is obtained to disconnect the power supply of the target circuit.

[0103] Furthermore, the temperature value output module 15 in the system is also used for:

[0104] If the contact form is an embedded contact form, obtaining an upper contact temperature sample and a lower contact temperature sample under the embedded contact form;

[0105] Establishing a temperature mapping relationship between the upper contact temperature sample and the lower contact temperature sample to obtain an upper-lower contact temperature mapping data set;

[0106] The upper-lower contact temperature mapping data set is used to train an embedded-alarm matching model, and the embedded-alarm matching model is encapsulated into the contact form-alarm matching module.

[0107] Furthermore, the temperature value output module 15 in the system is also used for:

[0108] The embedded-alarm matching model outputs a matching upper contact temperature value according to the lower contact temperature value;

[0109] When the matched upper contact temperature value is greater than the preset upper contact temperature value, a disconnection signal is obtained to disconnect the power supply of the target circuit.

[0110] Furthermore, the temperature value output module 15 in the system is also used for:

[0111] Sampling and predicting the signal execution process of the disconnect signal to obtain the execution timing;

[0112] An initial upper contact temperature limit is obtained, a temperature error threshold is set according to the execution sequence, and the initial upper contact temperature limit is optimized according to the temperature error threshold, and the optimization result is output as a preset upper contact temperature value.

[0113] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. Figure 1 The temperature monitoring alarm method and specific examples for fiber Bragg grating sensors in the first embodiment are also applicable to the temperature monitoring alarm system for fiber Bragg grating sensors in the present embodiment. Through the above detailed description of the temperature monitoring alarm method for fiber Bragg grating sensors, those skilled in the art can clearly know the temperature monitoring alarm system for fiber Bragg grating sensors in the present embodiment, so for the sake of brevity of the specification, it will not be described in detail here. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0114] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0115] Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure belong to the scope of the present disclosure and its equivalent technology, the present disclosure is also intended to include these modifications and variations.

Claims

1. A temperature monitoring and alarm method for a fiber grating sensor, characterized in that: The method comprises: Acquire a temperature sensing probe, wherein the temperature sensing probe is provided with a first fiber grating sensor and a second fiber grating sensor, and the temperature sensing probe is arranged at a switch-on position of a target circuit; Acquire a contact structure at a closing position of the target circuit switch, wherein the contact structure comprises an upper contact and a lower contact; Based on the contact structure, the first fiber grating sensor is used to collect temperature signals of the contact and output an upper contact temperature monitoring signal, and the second fiber grating sensor is used to collect temperature signals of the contact and output a lower contact temperature monitoring signal; Inputting the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module, and outputting an upper contact temperature value and a lower contact temperature value by the temperature demodulation module; Inputting the upper contact temperature value and the lower contact temperature value into a pre-packaged contact form-alarm matching module, performing temperature matching according to the contact form-alarm matching module, and obtaining a disconnection signal for disconnecting the power supply of the target circuit if the matching degree meets a preset matching degree; Wherein, the method further comprises: Determining the contact form of the target circuit switch at the closing position; Determine whether the contact form of the contact is an embedded contact form, if the contact form is a non-embedded contact form, wherein the non-embedded contact form includes point contact, surface contact and line contact; Perform temperature sample simulation according to the point contact, the surface contact and the line contact to obtain a point contact temperature sample, a surface contact temperature sample and a line contact temperature sample; According to the point contact temperature samples, the surface contact temperature samples and the line contact temperature samples, a non-embedded-alarm matching model is trained; Encapsulating the non-embedded-alarm matching model into the contact form-alarm matching module; Wherein, the method further comprises: Feature extraction is performed according to the point contact temperature samples, the surface contact temperature samples and the line contact temperature samples to obtain point contact warning features, surface contact warning features and line contact warning features; Among them, each warning feature includes the temperature distribution feature of the upper contact, the temperature rise rate feature of the upper contact, the temperature distribution feature of the lower contact, and the temperature rise rate feature of the lower contact; According to the point contact warning feature, the surface contact warning feature and the line contact warning feature, the non-embedded-warning matching model is trained, wherein the non-embedded-warning matching model includes a point contact warning matching channel, a surface contact warning matching channel and a line contact warning matching channel; If the contact form of the contact is a non-embedded contact form, the upper contact temperature monitoring signal and the lower contact temperature monitoring signal are input into the corresponding alarm matching channel for temperature matching, and if the matching degree meets the preset matching degree, a disconnection signal is obtained to disconnect the power supply of the target circuit; Wherein, the method further comprises: If the contact form is an embedded contact form, obtaining an upper contact temperature sample and a lower contact temperature sample under the embedded contact form; Establishing a temperature mapping relationship between the upper contact temperature sample and the lower contact temperature sample to obtain an upper-lower contact temperature mapping data set; The upper-lower contact temperature mapping data set is used to train an embedded-alarm matching model, and the embedded-alarm matching model is encapsulated into the contact form-alarm matching module.

2. The method according to claim 1, characterized in that If the contact contact form is an embedded contact form, inputting the upper contact temperature value and the lower contact temperature value into the embedded-alarm matching model includes: The embedded-alarm matching model outputs a matching upper contact temperature value according to the lower contact temperature value; When the matched upper contact temperature value is greater than the preset upper contact temperature value, a disconnection signal is obtained to disconnect the power supply of the target circuit.

3. The method according to claim 2, characterized in that The method further comprises: Sampling and predicting the signal execution process of the disconnect signal to obtain the execution timing; An initial upper contact temperature limit is obtained, a temperature error threshold is set according to the execution sequence, and the initial upper contact temperature limit is optimized according to the temperature error threshold, and the optimization result is output as a preset upper contact temperature value.

4. The method according to claim 1, characterized in that Inputting the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module comprises: Building a temperature demodulation module, wherein the temperature demodulation module is connected to a signal conversion module, and the signal conversion module is used to convert the reflected light signal of the optical fiber sensor into a temperature digital signal; The temperature demodulation module receives the temperature digital signal from the signal conversion module, establishes a demodulation relationship between the wavelength of the temperature digital signal and the real-time temperature value of the host computer acquisition system, uses the demodulation relationship to demodulate the upper contact temperature monitoring signal and the lower contact temperature monitoring signal, and outputs the upper contact temperature value and the lower contact temperature value through the temperature demodulation module.

5. A temperature monitoring and alarm system for fiber grating sensors, characterized in that: The system is used to implement the temperature monitoring and alarm method for a fiber grating sensor according to any one of claims 1 to 4, comprising: A temperature sensing probe acquisition module, the temperature sensing probe acquisition module is used to acquire a temperature sensing probe, the temperature sensing probe is provided with a first fiber grating sensor and a second fiber grating sensor, and the temperature sensing probe is arranged at the switch closing position of the target circuit; A contact structure acquisition module, the contact structure acquisition module is used to acquire the contact structure of the target circuit switch at the closing position, the contact structure comprising an upper contact and a lower contact; A temperature signal acquisition module, wherein the temperature signal acquisition module is used to acquire temperature signals of the contact using the first fiber grating sensor based on the contact structure, and output an upper contact temperature monitoring signal, and to acquire temperature signals of the contact using the second fiber grating sensor, and output a lower contact temperature monitoring signal; A temperature value output module, the temperature value output module is used to input the upper contact temperature monitoring signal and the lower contact temperature monitoring signal into a temperature demodulation module, and the temperature demodulation module outputs the upper contact temperature value and the lower contact temperature value; A disconnect signal acquisition module, wherein the disconnect signal acquisition module is used to input the upper contact temperature value and the lower contact temperature value into a pre-packaged contact form-alarm matching module, perform temperature matching according to the contact form-alarm matching module, and if the matching degree meets the preset matching degree, obtain a disconnect signal for disconnecting the power supply of the target circuit.

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