Electrical equipment internal temperature field and partial discharge on-line monitoring and fault early warning equipment

Abstract

An internal temperature field and partial discharge on-line monitoring and fault early warning device for power equipment comprises an infrared signal detection and transmission system and a data detection and fault evaluation system in signal connection with the infrared signal detection and transmission system. The infrared signal detection and transmission system comprises a head end searchlighting light path and a signal conversion device which are connected through an infrared optical fiber bundle, and the data detection and fault evaluation system is located on an upper computer and comprises a signal processing module, a data real-time monitoring module and a fault judgment and evaluation module; according to the invention, an infrared radiation image of temperature field distribution in the detected power equipment is detected through the head end searchlighting light path, optical signals are converted and processed through the signal conversion device and the signal processing module, displayed and stored through the data real-time monitoring module, and compared through the fault judgment and evaluation module to provide fault diagnosis. Real-time monitoring and remote control are achieved, the measurement precision is high, the measurement range is wide, and early warning is timely and accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment monitoring, and in particular relates to an online monitoring and fault warning device for the internal temperature field and partial discharge of electric power equipment. Background Art

[0002] In the power system, as the operating life of power equipment continues to increase, under the influence of many factors such as internal wear and external environment, the equipment will deteriorate and age, leading to failures. Internal temperature field monitoring and partial discharge monitoring of power equipment can effectively detect abnormal conditions inside the equipment and ensure the normal operation of the equipment.

[0003] Most of the existing temperature monitoring technologies use temperature sensors and temperature numerical display technology, but in actual use, temperature sensors are difficult to measure the temperature field distribution over a large range, so multiple temperature sensors need to be installed, and the measurement results have delay errors and low accuracy. The patent application with publication number CN208125289U proposes a comprehensive temperature monitoring and control device, which effectively adapts to the occasions where temperature monitoring and control are required at the same time, the temperature is output at 4-20mA, and multiple communication methods are required on site, but its assembly uses multiple temperature sensors, the measurement delay error increases, and the accuracy decreases. If the direct detection method is used, high-emissivity coating is applied inside the equipment, which will damage the insulation structure of the equipment. If the indirect detection method is used, the internal temperature field is inferred from the external temperature. The internal and external heat transfer process is complicated, there are certain errors and delays, and the accuracy is not high. Therefore, using infrared optical measurement methods to measure the internal temperature and warn of faults can avoid damaging the insulation structure of the equipment, while reducing external interference and improving measurement accuracy, which is of great significance to the safe and reliable operation of power equipment. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide an online monitoring and fault warning device for the internal temperature field and partial discharge of power equipment. The device is directly connected to the equipment under test through the head-end searchlight path, detects the internal temperature field, does not cause disturbance and damage to the internal thermal balance and normal operation of the power equipment, and can realize real-time monitoring of the temperature field distribution of the power equipment, improve the accuracy of the measurement results, and automatically evaluate the temperature field status, and issue a fault warning for the abnormal location; the equipment is equipped with a partial discharge detection function, which can realize fault judgment for different types of partial discharges, reduce the occurrence of faults, and improve the working efficiency and service life of the power equipment.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The internal temperature field and partial discharge online monitoring and fault warning equipment of power equipment includes infrared signal detection and transmission system A, and data detection and fault assessment system B connected with its signal;

[0007] The data detection and fault assessment system B is installed on the host computer and includes a signal processing module 8, a real-time data monitoring module 9 and a fault determination and assessment module 10;

[0008] The infrared signal detection and transmission system A comprises an infrared signal detection module 11 and a signal transmission module 7; the infrared signal detection module 11 comprises a head-end searchlight path 11-1 and a signal conversion device 11-2 connected and transmitting optical signals through a flexible infrared optical fiber bundle 4;

[0009] The head-end searchlight path 11-1 directly detects the internal temperature field of the tested power equipment 3, and the detected signal is transmitted to the data detection and fault assessment system B on the host computer through the signal conversion device 11-2 and the signal transmission module 7, so as to realize real-time monitoring, assessment and early warning of the temperature field distribution of the power equipment.

[0010] The head-end searchlight path 11-1 includes a lens group 1, a flange 2 and an infrared optical fiber bundle 4. The lens group 1 is sealed and connected to the power equipment 3 under test through the flange 2. The other end of the flange 2 is connected to the pigtail of the infrared optical fiber bundle 4. The infrared optical fiber bundle 4 transmits the optical signal of the head-end searchlight path 11-1 to the signal conversion device 11-2.

[0011] When measuring the internal temperature field distribution of different power equipment, the lens group 1 selects and replaces lenses of different wavelengths according to the selective absorption of infrared radiation of specific bands by different internal gases.

[0012] The signal conversion device 11-2 includes a photoelectric conversion device 5 and a PCB circuit board 6, which receives the infrared radiation optical signal inside the tested power equipment 3 sent by the head-end searchlight path 11-1 through the infrared optical fiber bundle 4, and is then connected to the data detection and fault assessment system B of the host computer through the signal transmission module 7; wherein the photoelectric conversion device 5 converts the optical signal received by the infrared optical fiber bundle 4 into an electrical signal and transmits it to the host computer interface circuit through the signal transmission module 7; the PCB circuit board 6 is used to provide electrical energy to the photoelectric conversion device 5.

[0013] The signal transmission module 7 connects the infrared signal detection and transmission system A and the host computer to shield interference signals from the external environment.

[0014] The signal processing module 8 of the data detection and fault assessment system B is used to correct, analyze and restore the electrical signal transmitted by the signal transmission module 7; the real-time data monitoring module 9 realizes the real-time display of the thermal imaging diagram of the infrared temperature field inside the tested equipment and the display and storage of related temperature data; the fault judgment and assessment module 10 compares and analyzes the real-time measurement results with the calibration data of the relationship between infrared radiation and temperature under different gas and liquid environments, derives the possible fault cause of the abnormal temperature field, and issues a fault alarm to prompt relevant personnel to deal with it in time to reduce the loss rate and accident rate.

[0015] The signal processing module 8 is used to correct, analyze and restore the electrical signal transmitted by the signal transmission module, specifically:

[0016] (1) The signal processing module 8 filters out noise and error components caused by the measured power equipment 3 and environmental interference, and obtains the temperature field electrical signal after the interference is removed;

[0017] (2) The temperature field electrical signal after interference removal is used to compensate and restore the gap value of the measurement point using the natural neighbor interpolation method to obtain a continuous temperature field infrared distribution image.

[0018] The data real-time monitoring module 9 realizes the real-time display of the infrared temperature field thermal imaging image inside the tested device and the display and storage of related temperature data, specifically:

[0019] (1) The data real-time monitoring module 9 displays the processing result of the signal processing module 8, i.e., the real-time temperature field measurement image, on the main interface of the data detection and fault assessment system B of the host computer. The image is updated over time, and the temperature range, temperature gradient, average temperature, and center point temperature field data of the measured position are stored and updated in real time;

[0020] (2) The data real-time monitoring module 9 has the functions of real-time temperature data display, temperature time-varying trend query, and equipment working status query. It can query the dynamic image of the temperature field change of the measured equipment area within a certain period of time and the specified temperature field data change curve diagram, and judge and display the equipment working status based on the temperature field change trend and the basic data when the equipment is in normal operation, fault operation, maintenance operation, and shutdown state.

[0021] The fault determination and assessment module (10) has the functions of partial discharge fault assessment and equipment fault early warning, specifically:

[0022] (1) The partial discharge fault assessment function is to compare the real-time measured temperature field data with the typical abnormality database stored in the data detection and fault assessment system B, and determine the data type closest to the typical abnormal data as abnormal data;

[0023] (2) Equipment fault warning function is to mark the time and location when abnormal data appears, and issue a fault warning to prompt relevant personnel to check and handle it in time.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The head-end searchlight path 11 - 1 is embedded in the shell of the tested power equipment 3 to perform infrared radiation imaging of the temperature field inside the equipment without causing disturbance or damage to the internal thermal balance and normal operation of the power equipment.

[0026] (2) The optical signal detected by the head-end searchlight path 11-1 is transmitted to the photoelectric conversion device 5 through the flexible infrared optical fiber bundle 4, which can realize long-distance infrared temperature thermal image monitoring, while extending the insulation distance and reducing the negative impact of electromagnetic interference on the monitoring device.

[0027] (3) The fault judgment and assessment module 10 monitors the temperature field data and thermal map in real time based on the typical temperature field distribution characteristics under different types of partial discharge faults. When abnormal temperature distribution characteristics appear, the abnormal position is marked in time, the abnormal partial discharge type is determined, and a fault alarm is issued to reduce the occurrence rate of partial discharge faults of power equipment and prevent subsequent serious accidents.

[0028] In summary, the present invention embeds the head-end searchlight path 11-1 in the casing of the tested power equipment 3 to perform infrared radiation imaging of the temperature field inside the equipment, corrects and restores the electrical signal after photoelectric conversion to obtain the original distribution of the temperature field, and makes real-time temperature monitoring more accurate, realizing comprehensive monitoring of the equipment by remote control. The temperature measurement data is comprehensively analyzed and compared to obtain the working status of the power equipment and possible fault causes and locations. The partial discharge assessment mode can make fault diagnosis for different types of partial discharges, and quickly issue fault warnings and locate faults when abnormal temperature fields occur so that relevant personnel can handle them in time, thereby reducing the failure rate of power equipment and effectively improving its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the head-end searchlight path 11 - 1 of the present invention.

[0030] Figure 2 It is a schematic diagram of the module composition and connection structure of the present invention.

[0031] Figure 3 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 2 As shown, the internal temperature field and partial discharge online monitoring and fault warning equipment of the power equipment includes an infrared signal detection and transmission system A, and a data detection and fault assessment system B connected with its signal:

[0034] The data detection and fault assessment system B is installed on the host computer and includes a signal processing module 8, a real-time data monitoring module 9 and a fault determination and assessment module 10;

[0035] The infrared signal detection and transmission system A comprises an infrared signal detection module and a signal transmission module 7; the infrared signal detection module 11 comprises a head-end searchlight path 11-1 and a signal conversion device 11-2 connected and transmitting optical signals through a flexible infrared optical fiber bundle 4;

[0036] The head-end searchlight path 11-1 directly detects the internal temperature field of the tested power equipment 3, and the detected signal is transmitted to the data detection and fault assessment system B on the host computer through the signal conversion device 11-2 and the signal transmission module 7, so as to realize real-time monitoring, assessment and early warning of the temperature field distribution of the power equipment.

[0037] like Figure 1 As shown, the head-end searchlight path 11-1 includes a detachable lens group 1, a flange 2 and an infrared optical fiber bundle 4. The lens group 1 is sealed and connected to the tested power equipment 3 through the flange 2 to prevent internal gas leakage; the other end of the flange 2 is connected to the pigtail of the infrared optical fiber bundle 4, and the infrared optical fiber bundle 4 transmits the optical signal of the head-end searchlight path 11-1 to the signal conversion device 11-2;

[0038] Specifically, the head-end searchlight path 11-1 is located at the front end of the device, connected to the power equipment 3 under test and embedded in the device casing, and includes three detachable lens groups, a set of dynamic and static flange joints, and a flexible infrared optical fiber bundle, which illuminates the temperature infrared radiation signal within a specified range inside the device.

[0039] During the combined packaging stage of the head-end searchlight light path 11-1, the overall optical path system is simulated, the error is decomposed according to the total error requirements of the design indicators, optical crystals with a high light damage threshold are selected, and they are polished and manufactured using precision optical processing equipment. The packaging shell is processed on a high-precision CNC lathe to complete the overall packaging and curing of the lens combination, ensuring that the overall packaging quality is qualified.

[0040] The detachable lens group 1 is used to select and replace lenses of different wavelengths according to the selective absorption of infrared radiation of specific bands by different internal gases when measuring the internal temperature field distribution of different power equipment;

[0041] Specifically, due to the different internal gas environments and absorption wavelengths of different power equipment, one set of lenses cannot meet all gas environments. Therefore, a detachable lens group with different focal lengths is required to facilitate the selection of the most suitable measurement focal length when measuring different power equipment.

[0042] The flange 2 is used to connect the lens group and the electrical equipment under test to prevent gas leakage;

[0043] Specifically, the dynamic and static flanges are used to connect the lens group of the head-end searchlight path 11-1 and the electrical equipment under test, and are provided with a gas leak-proof device that fills the gap in the device to prevent gas leakage from affecting the normal operation of the electrical equipment.

[0044] The flexible infrared optical fiber bundle 4 is used to connect the lens group of the head-end searchlight path 11-1 and the signal conversion device 11-2, and receives the infrared light signal obtained by the lens group from the inside of the tested power equipment. The infrared light signal is transmitted to the signal conversion device 11-2 connected to the optical fiber bundle through the inside of the infrared optical fiber bundle;

[0045] Specifically, the flexible infrared optical fiber bundle transmits the optical signal of the head-end searchlight path 11-1 to the signal conversion device 11-2, while protecting the optical signal from interference from external environmental factors. Its specific material, manufacturing process and design are developed according to the specific use environment.

[0046] The signal conversion device 11-2 includes a photoelectric conversion device 5 and a PCB circuit board 6, which receives the infrared radiation optical signal inside the tested power equipment 3 sent by the head-end searchlight path 11-1 through the infrared optical fiber bundle 4, and is then connected to the data detection and fault assessment system B of the host computer through the signal transmission module 7, wherein the photoelectric conversion device 5 converts the optical signal received by the infrared optical fiber bundle 4 into an electrical signal and transmits it to the host computer interface circuit through the signal transmission module 7; the PCB circuit board 6 is used to provide electrical energy to the photoelectric conversion device 6.

[0047] Specifically, the photoelectric conversion device uses a 8-14 μm working wavelength CCD array for photoelectric conversion to obtain a 384*288 circuit array electrical signal. A dedicated interface circuit is provided on the host computer for receiving the converted electrical signal.

[0048] The PCB circuit board 6 is used to provide electrical energy to the photoelectric conversion device to facilitate signal transmission.

[0049] The signal transmission module 7 is connected to the infrared signal detection and transmission system A and the host computer to shield interference signals from the external environment;

[0050] Specifically, the cable length can be selected according to needs, so that relevant personnel can realize real-time monitoring of the temperature field even if they are not at the work site, meet the needs of the remote control measurement system, and prevent interference between the running power equipment and the host computer system.

[0051] The data detection and fault assessment system B includes a signal processing module 8, a real-time data monitoring module 9 and a fault judgment and assessment module 10. The signal processing module 8 is used to correct, analyze and restore the electrical signal transmitted by the signal transmission module 7; the real-time data monitoring module 9 realizes the real-time display of the thermal imaging diagram of the infrared temperature field inside the tested equipment and the display and storage of related temperature data; the fault judgment and assessment module 10 compares and analyzes the real-time measurement results with the calibration data of the relationship between infrared radiation and temperature under different gas and liquid environments, derives the possible fault cause of the abnormal temperature field, and issues a fault alarm to prompt relevant personnel to deal with it in time to reduce the loss rate and accident rate.

[0052] The signal processing module 8 is used to correct, analyze and restore the electrical signal transmitted by the signal transmission module, specifically:

[0053] (1) The signal processing module 8 filters out noise and error components caused by the measured power equipment 3 and environmental interference, and obtains a corrected temperature field electrical signal by referring to the average reference value under the standard of factors such as field temperature and humidity;

[0054] Specifically, the signal processing module is located in the host computer. After receiving the converted electrical signal, it uses the LVDS digital video format to realize 384*288 array signal acquisition. The hardware interface is the TYPE-C / USB interface. The first half of all data packets are the current pixel image data, and the second half are the current position temperature data. The clock frequency is 33.75MHz, which can ensure high-speed image acquisition and quantification.

[0055] (2) The signal processing module 8 uses the interpolation method to restore the gap value of the measurement point, and corrects and compensates the acquired temperature field data through the non-uniformity correction algorithm, image enhancement algorithm and artificial neural network technology to obtain a high-precision infrared distribution image of the equipment temperature field;

[0056] Specifically, in response to the inevitable blind pixel problem of the CCD array, the 4*4 digital mean is used for calibration and correction through software; the software algorithm quickly searches for zero-value blind pixels and calibrates their positions through data file comparison, and then calculates the estimated value of the point by averaging the adjacent data and automatically inserts it; since the power equipment may have a wide range of temperature changes during actual operation, a gain correction function is designed in the software, which can manually or automatically obtain high and low temperature data within the field of view, automatically select the gain, ensure the accuracy of the temperature measurement data, and provide the temperature measurement error and confidence interval.

[0057] The data real-time monitoring module 9 realizes the real-time display of the infrared temperature field thermal imaging image inside the tested device and the display and storage of related temperature data, specifically:

[0058] (1) The data real-time monitoring module 9 displays the processing result of the signal processing module 8, i.e., the real-time temperature field measurement image, on the main interface of the data detection and fault assessment system B of the host computer. The image is updated over time, and the temperature range, temperature gradient, average temperature, and center point temperature field data of the measured position are stored and updated in real time;

[0059] (2) The data real-time monitoring module 9 has the functions of real-time temperature data display, temperature time-varying trend query, and equipment working status query. It can query the dynamic image of the temperature field change of the measured equipment area within a certain period of time and the specified temperature field data change curve diagram, and judge and display the equipment working status according to the temperature field change trend and the basic data when the equipment is in normal operation, fault operation, maintenance operation, and shutdown state;

[0060] Specifically, the real-time temperature data display function displays the restored temperature field distribution image on the main interface screen, and displays the temperature field data such as the temperature range, temperature gradient, average temperature, center point temperature, etc. of the measured temperature field. All measurement data are continuously updated over time, and the data real-time monitoring module stores the historical measurement data in the database in chronological order.

[0061] The temperature time-varying trend query function can retrieve the historical data of the equipment temperature field within a certain period of time to form a time-varying curve graph of the temperature observation data. If the temperature field distribution change is queried, a dynamic change image can be generated and displayed on the main screen;

[0062] The host computer inputs the basic temperature field data of the power equipment in normal operation, fault operation, maintenance operation and shutdown state into the database in advance. When using the equipment working status query function, the temperature measurement results can be compared and analyzed with the data in the database to obtain the specific working status of the equipment, which is convenient for relevant personnel to remotely monitor the operation of the power equipment.

[0063] The fault determination and assessment module 10 has the functions of partial discharge fault assessment and equipment fault early warning, specifically:

[0064] (1) The partial discharge fault assessment function is to compare the real-time measured temperature field data with the typical abnormality database stored in the data detection and fault assessment system B, and determine the data type closest to the typical abnormal data as abnormal data;

[0065] Specifically, the host computer system contains abnormal data on the temperature field characteristic distribution of local discharge types such as corona discharge, arc discharge, surface discharge and air gap discharge in the database, and classifies them according to different power equipment. When the local discharge fault assessment function is selected, the device monitors the temperature field changes of the equipment. When abnormal temperature fluctuations occur, it is compared and analyzed with the data in the database, and the data type that is closest to the data is determined to be abnormal data.

[0066] (2) Equipment fault warning function is to mark the time and location when abnormal data appears, and issue a fault warning to prompt relevant personnel to check and handle it in time.

[0067] Specifically, when abnormal temperature distribution occurs, the device will specially mark the location and time of the abnormality, conduct a comprehensive comparative analysis of the signals, quickly make a fault assessment and promptly issue a fault alarm prompt, and send out a warning sound to remind relevant staff to deal with and inspect as soon as possible, thereby reducing the failure rate and increasing the service life of power equipment.

[0068] Reference Figure 3 , the working principle of the present invention is:

[0069] The present invention receives the infrared light signal inside the tested power equipment 3, obtains the infrared heat map of the temperature field and the temperature distribution information, and evaluates and explains the fault type and location when abnormal temperature distribution occurs or partial discharge occurs, and issues a fault warning in time, specifically:

[0070] (1) The head-end searchlight path 11-1 of the present invention is connected to the power equipment under test through the dynamic and static flanges. The infrared light signal inside the power equipment enters the monitoring device through the lens group part of the head-end searchlight path 11-1 and is transmitted to the signal conversion device 11-2 via the flexible infrared optical fiber bundle.

[0071] The optical path structure of this design is more compact, more integrated and more precisely assembled than the existing technology, and does not interfere with the normal operation of power equipment.

[0072] (1.1) The lens group 1 of the head-end searchlight path 11 - 1 receives the infrared light signal emitted from the tested power equipment 3 to the maximum extent and transmits it to the infrared optical fiber bundle 4 .

[0073] (1.2) The flexible infrared optical fiber bundle 4 is used to connect the lens group 1 of the head-end searchlight path 11-1 and the signal conversion device 11-2, and receives the infrared light signal obtained by the lens group 1 from the inside of the tested power equipment 3. The infrared light signal is transmitted through the inside of the infrared optical fiber bundle 4 to the signal conversion device 11-2 connected to the optical fiber bundle.

[0074] (2) The signal conversion device 11-2 of the present invention is used for photoelectric conversion and preliminary processing of electrical signals. The photoelectric conversion device receives infrared light signals from the internal of the tested power equipment transmitted by the flexible infrared optical fiber bundle, converts the infrared light signals into electrical signals and transmits the electrical signals to the signal transmission module 7. The PCB circuit board 6 provides electrical energy for the operation of the photoelectric conversion device.

[0075] (2.1) The photoelectric conversion device 5 receives the optical signal array. The infrared light intensity needs to maintain a strict linear relationship with the VOIC circuit output and form an image at the focal plane of the infrared CCD. The pixels fill the CCD array unit. The 8-14μm working wavelength CCD array is used for photoelectric conversion to obtain a 384*288 circuit array electrical signal. A special interface circuit is set on the host computer to receive the converted electrical signal.

[0076] (2.2) The photoelectric conversion device 5 isolates the signal from the external environment, performs preliminary correction and conversion in the photoelectric conversion device 5, reduces its loss rate, and improves the measurement accuracy.

[0077] (3) The signal transmission module 7 of the present invention is used to connect the infrared signal detection module with the host computer, and transmit the electrical signal obtained after the signal conversion device 11-2 converts the infrared light signal to the data detection and fault assessment system B installed in the host computer.

[0078] (3.1) The signal transmission module includes a signal transmission cable and a protective shell, which connects the infrared signal detection and transmission system A and the host computer to shield interference signals from the external environment.

[0079] (3.2) The cable length can be selected as needed, so that relevant personnel can realize real-time monitoring of the temperature field even when they are not at the work site, meet the needs of the remote control measurement system, prevent interference between the running power equipment and the host computer system, and improve work efficiency.

[0080] (4) The signal processing module 9 of the data detection and fault assessment system B is used to receive the electrical signal transmitted to the data detection and fault assessment system B by the signal transmission module, and to correct and restore the electrical signal.

[0081] (4.1) The signal processing module 8 is located in the host computer. After receiving the converted electrical signal, it uses the LVDS digital video format to realize 384*288 array signal acquisition. The hardware interface is the TYPE-C / USB interface. The first half of all data packets are the current pixel image data, and the second half are the current position temperature data. The clock frequency is 33.75MHz, which can ensure high-speed image acquisition and quantification.

[0082] (5) The real-time data monitoring module 9 of the data detection and fault assessment system B is used to store and display the temperature field data and image information obtained after the signal processing module corrects and restores the electrical signal.

[0083] (5.1) The data real-time monitoring module 9 displays the processing results of the signal processing module, i.e., the real-time temperature field measurement image, on the main interface of the data detection and fault assessment system B of the host computer. The image is updated over time, and the temperature range, temperature gradient, average temperature, and center point temperature field data of the temperature field at the measured position are stored and updated in real time.

[0084] (5.2) The data real-time monitoring module 9 has the functions of real-time temperature data display, temperature time-varying trend query, and equipment working status query. It can query the dynamic image of the temperature field change of the measured equipment area within a certain period of time and the specified temperature field data change curve chart, and judge and display the equipment working status based on the temperature field change trend and the basic data when the equipment is in normal operation, fault operation, maintenance operation and shutdown state.

[0085] (6) The fault determination and evaluation module 10 of the data detection and fault evaluation system B is used to compare the temperature information obtained by the monitoring equipment with the typical fault characteristic information, and to perform partial discharge fault evaluation and early warning on the temperature field data and image information of the tested power equipment 3.

[0086] (6.1) The database of the fault judgment and evaluation module 10 contains temperature field characteristic distribution data of local discharge types such as corona discharge, arc discharge, surface discharge and air gap discharge. When the local discharge fault evaluation function is selected, when abnormal temperature fluctuation occurs, the fault judgment and evaluation module compares and analyzes the abnormal signal with the local discharge data in the database, gives the fault type and cause evaluation, and indicates the location where the fault occurs.

[0087] (6.2) When abnormal temperature distribution occurs, the fault judgment and assessment module quickly makes a fault assessment and issues a fault alarm prompt in a timely manner, and emits a warning sound to remind relevant staff to handle and inspect as soon as possible.

[0088] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Online monitoring and fault warning equipment for internal temperature field and partial discharge of power equipment, characterized in that: It includes an infrared signal detection and transmission system (A), and a data detection and fault assessment system (B) connected to the signal: The data detection and fault assessment system (B) is installed on a host computer and comprises a signal processing module 8, a real-time data monitoring module (9) and a fault determination and assessment module (10); The infrared signal detection and transmission system (A) comprises an infrared signal detection module and a signal transmission module (7); the infrared signal detection module comprises a head-end searchlight path (11-1) and a signal conversion device (11-2) for connecting and transmitting optical signals through a flexible infrared optical fiber bundle (4); The head-end searchlight path (11-1) directly detects the internal temperature field of the tested power equipment (3), and the detected signal is transmitted to the data detection and fault assessment system (B) on the host computer via the signal conversion device (11-2) and the signal transmission module (7), thereby realizing real-time monitoring, assessment and early warning of the temperature field distribution of the power equipment.

2. The device for online monitoring and fault warning of internal temperature field and partial discharge of electric power equipment according to claim 1 is characterized in that: The head-end searchlight path (11-1) comprises a lens group (1), a flange (2) and an infrared optical fiber bundle (4); the lens group (1) is sealed and connected to the measured power equipment (3) via the flange (2); the other end of the flange (2) is connected to the pigtail of the infrared optical fiber bundle (4); and the infrared optical fiber bundle (4) transmits the optical signal of the head-end searchlight path (11-1) to the signal conversion device (11-2).

3. The on-line monitoring and fault warning device for the internal temperature field and partial discharge of electric power equipment according to claim 2 is characterized in that: When measuring the internal temperature field distribution conditions of different power equipment, the lens group (1) selects and replaces lenses of different wavelengths according to the selective absorption of infrared radiation of specific bands by different internal gases.

4. The device for online monitoring and fault warning of internal temperature field and partial discharge of electric power equipment according to claim 1 is characterized in that: The signal conversion device (11-2) comprises a photoelectric conversion device (5) and a PCB circuit board (6), which receives an infrared radiation optical signal from the internal of the tested power equipment (3) sent by the head-end searchlight path (11-1) through an infrared optical fiber bundle (4), and is then connected to a data detection and fault assessment system (B) of a host computer through a signal transmission module (7); wherein the photoelectric conversion device (5) converts the optical signal received by the infrared optical fiber bundle (4) into an electrical signal and transmits it to an interface circuit of the host computer through the signal transmission module (7); and the PCB circuit board (6) is used to provide electrical energy to the photoelectric conversion device (5).

5. The device for online monitoring and fault warning of internal temperature field and partial discharge of electric power equipment according to claim 1 is characterized in that: The signal transmission module (7) is connected to the infrared signal detection and transmission system (A) and the host computer to shield interference signals from the external environment.

6. The device for online monitoring and fault warning of internal temperature field and partial discharge of electric power equipment according to claim 1 is characterized in that: The signal processing module (8) of the data detection and fault assessment system (B) is used to calibrate, analyze and restore the electrical signal transmitted by the signal transmission module (7); the real-time data monitoring module (9) realizes the real-time display of the infrared temperature field thermal imaging diagram inside the tested equipment and the display and storage of related temperature data; the fault judgment and assessment module (10) compares and analyzes the real-time measurement results with the calibration data of the relationship between infrared radiation and temperature under different gas and liquid environments, obtains the possible fault cause of the abnormal temperature field, and issues a fault alarm to prompt relevant personnel to deal with it in time to reduce the loss rate and accident rate.

7. The device for online monitoring and fault warning of internal temperature field and partial discharge of electric power equipment according to claim 6 is characterized in that: The signal processing module (8) is used to perform correction analysis and restoration on the electrical signal transmitted by the signal transmission module, specifically: (1) The signal processing module (8) filters out noise and error components caused by the measured power equipment (3) and environmental interference, and obtains a temperature field electrical signal after the interference is removed; (2) The temperature field electrical signal after interference removal is used to compensate and restore the gap value of the measurement point using the natural neighbor interpolation method to obtain a continuous temperature field infrared distribution image.

8. According to the online monitoring and fault warning device for the internal temperature field and partial discharge of electric power equipment according to claim 6, the real-time data monitoring module (9) realizes the real-time display of the infrared temperature field thermal imaging image inside the tested equipment and the display and storage of related temperature data, specifically: (1) The data real-time monitoring module (9) displays the processing result of the signal processing module (8), i.e., the real-time temperature field measurement image, on the main interface of the data detection and fault assessment system B of the host computer. The image is updated as time changes. At the same time, the temperature range, temperature gradient, average temperature, and center point temperature field data of the temperature field at the measured position are stored and updated in real time; (2) The data real-time monitoring module (9) has the functions of real-time temperature data display, temperature time-varying trend query, and equipment working status query. It can query the dynamic image of the temperature field change of the measured equipment area within a certain period of time and the specified temperature field data change curve chart, and judge and display the equipment working status based on the temperature field change trend and the basic data when the equipment is in normal operation, fault operation, maintenance operation, and shutdown state.

9. According to the device for online monitoring and fault warning of the internal temperature field and partial discharge of electric power equipment as claimed in claim 6, the fault judgment and evaluation module (10) has the functions of partial discharge fault evaluation and equipment fault warning, specifically: (1) The partial discharge fault assessment function is to compare the real-time measured temperature field data with the typical abnormality database stored in the data detection and fault assessment system B, and determine the data type closest to the typical abnormal data as abnormal data; (2) Equipment fault warning function is to mark the time and location when abnormal data appears, and issue a fault warning to prompt relevant personnel to check and handle it in time.

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