Test monitoring system and method for ultra-high voltage wire outlet device

Abstract

The invention belongs to the field of transformer equipment, and discloses a test monitoring system and method for an ultra-high voltage wire outlet device, and the system is characterized in that various sensor units are arranged on key parts of the ultra-high voltage wire outlet device, namely a high-voltage ascending flanged base, a housing and a test device; comprising ultrahigh-frequency, optical, ultrasonic and high-frequency sensors and an oil chromatography and single hydrogen monitoring device, and synchronous monitoring of discharge signals and changes of chemical components in oil is achieved. By utilizing the complementary characteristics of different sensors, abnormal information generated by insulation defects is captured from multiple dimensions of electromagnetism, acoustics, optics, chemistry and the like, and through multi-source data fusion analysis, the insulation performance of the wire outlet device in an independent test state can be comprehensively diagnosed. According to the system, the problem that the insulation reliability cannot be accurately evaluated due to the lack of effective monitoring means in the traditional method is effectively solved, and the coverage range and the fault detection precision of the test are remarkably improved, so that the risks of manufacturing and quality control of the ultra-high voltage equipment are reduced, and the operation safety of the equipment is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of transformer equipment, and particularly relates to the field of super-ultra high voltage outgoing line device, and especially relates to a test monitoring system and method for a super-ultra high voltage outgoing line device. BACKGROUND

[0002] The super-ultra high voltage outgoing line device is a key insulation structure for connecting the internal winding of the equipment and the external bushing, and its insulation performance directly determines the operation safety and reliability of the entire power equipment. With the rapid development of the power system towards the super-ultra high voltage direction, the capacity and voltage level of the transformer and the reactor continue to increase, and as the core insulation component, the high voltage outgoing line device needs to withstand higher electric field strength and more complex operating conditions, and its insulation reliability has become an important prerequisite for ensuring the stable operation of the power grid, so the industry has put forward extremely strict requirements for the insulation performance verification of the high voltage outgoing line device.

[0003] At present, the insulation reliability verification of the super-ultra high voltage device mainly relies on the overall test mode after the transformer body is assembled, which has certain applicability in the verification of conventional voltage level equipment. However, for super-ultra high voltage transformers, not only are they extremely expensive, but they are also customized production modes, and if there is no matching transformer body, the high voltage outgoing line device needs to be installed separately on a special test device for verification, and at present there is still a lack of effective test monitoring and verification means for the high voltage outgoing line device in a separate installation state in the industry, which leads to the inability to accurately and comprehensively evaluate the insulation reliability of the high voltage outgoing line device during separate testing, and brings great obstacles to the manufacturing and quality control of super-ultra high voltage equipment.

[0004] Therefore, the high voltage outgoing line device of the current super-ultra high voltage transformer and reactor has the technical problem of lacking a separate test monitoring and verification method when lacking a matching body. SUMMARY

[0005] The present application provides a test monitoring system and method for a super-ultra high voltage outgoing line device, which can effectively solve the problem that the current super-ultra high voltage outgoing line device test cannot be monitored and verified.

[0006] In order to achieve the above purpose, the present application adopts the following technical content: A test monitoring system for a super-ultra high voltage outgoing line device, one end of the super-ultra high voltage outgoing line device is connected to a test device, and the other end is connected to a high voltage riser, comprising a plurality of sensor units, the sensor units are arranged at different positions of the super-ultra high voltage outgoing line device, and are used for synchronously monitoring the discharge signal and / or the change of chemical composition in the oil of the super-ultra high voltage outgoing line device during the test process; The sensor unit at least includes multiple types of ultra-high frequency sensors, optical sensors, ultrasonic sensors and high frequency sensors, and at least one of an oil chromatograph monitoring device and a single hydrogen sensor. The arrangement position of the sensor unit includes a high-voltage riser, a high-voltage outgoing line device shell and a preset part of the test device, so as to realize comprehensive monitoring of the top, middle, tail and corner area of the ultra-high-voltage outgoing line device.

[0007] Further, the UHF sensor and the optical sensor are arranged in groups and are respectively installed at least one of the first handhole cover plate of the high-voltage riser, the L-shaped corner of the high-voltage outgoing line device shell and the second handhole cover plate of the test device shell, for synchronously monitoring the discharge signal in the test process.

[0008] Further, the ultrasonic sensor is arranged at least one of the outer surface of the barrel wall of the high-voltage riser, the surface of the high-voltage outgoing line device shell and the surface of the test device shell, for ultrasonic positioning of the discharge signal.

[0009] Further, the high-frequency sensor is arranged at the equipotential line position of the high-voltage riser and the high-voltage outgoing line device, and / or the equipotential line position of the high-voltage outgoing line device and the test device, for synchronously monitoring the high-frequency partial discharge signal.

[0010] Further, the oil chromatographic monitoring device is installed at the first valve position at the top of the high-voltage riser, for monitoring the change rule of the dissolved gas in the oil in the test process.

[0011] Further, the single hydrogen sensor is installed at the second valve position at the top of the high-voltage riser, for monitoring the change of the hydrogen content in the oil in the test process.

[0012] Further, the off-line oil sampling device is installed at the bottom of the test device, for off-line chromatographic analysis of the dissolved gas in the oil in the test process.

[0013] A test monitoring method for an ultra-high-voltage outgoing line device, based on the above-mentioned test monitoring system for the ultra-high-voltage outgoing line device, comprising: arranging a plurality of sensor units at preset positions on the high-voltage riser, the high-voltage outgoing line device shell and the test device; in the test process, synchronously collecting discharge signal data and / or oil chemical component data of the ultra-high-voltage outgoing line device by using the sensor unit; based on the collected data, analyzing and evaluating the insulation state of the ultra-high-voltage outgoing line device.

[0014] Further, the arrangement of a plurality of sensor units at preset positions on the high-voltage riser, the high-voltage outgoing line device shell and the test device comprises: At least one of the first hand hole cover plate of the high-voltage riser, the L-shaped corner of the high-voltage outgoing line device shell and the second hand hole cover plate of the test device shell is arranged with a UHF sensor and an optical sensor to synchronously collect discharge signals at different positions. At least one of the outer surface of the cylinder wall of the high-voltage riser, the surface of the high-voltage outgoing line device shell and the surface of the test device shell is arranged with an ultrasonic sensor to spatially locate the discharge signals. A high-frequency sensor is arranged at the equipotential line position of the high-voltage riser and the high-voltage outgoing line device and / or the equipotential line position of the high-voltage outgoing line device and the test device to collect high-frequency partial discharge signals.

[0015] Further, the oil gas analysis and monitoring process is further included, and the specific steps are as follows: The oil chromatographic monitoring device of the first valve installed at the top of the high-voltage riser is used to monitor the content change of various dissolved gases in the oil in real time during the test process; The single hydrogen sensor of the second valve installed at the top of the high-voltage riser is used to monitor the content change of hydrogen in the oil in real time; The offline oil sampling device arranged at the bottom of the test device is used to obtain an oil sample, and the oil sample is subjected to offline chromatographic analysis to serve as supplementary verification data of the online monitoring data.

[0016] Compared with the prior art, the present application has the following beneficial effects: The present application provides a test monitoring system for an ultra-high-voltage outgoing line device, which comprises a plurality of sensor units arranged at key positions of the ultra-high-voltage outgoing line device, such as a high-voltage riser, a shell and a test device, including UHF, optical, ultrasonic and high-frequency sensors, as well as oil chromatographic and single hydrogen monitoring devices, to realize synchronous monitoring of discharge signals and changes in chemical components in the oil. Preferably, in the present application, the ultra-high frequency sensors and optical sensors are arranged in groups at several key manhole cover plates and corner positions. These two types of sensors have different response characteristics to partial discharge, and their combined use can cross-verify and jointly detect the discharge phenomenon at the same position, effectively improving the sensitivity of discharge signal detection and the reliability of the results, and assisting in judging the discharge type. Through specific sensor combination and optimized layout strategy, the ability to capture discharge signals in areas with concentrated electric field or weak insulation is significantly enhanced, reducing the risk of missed detection.

[0017] Preferably, in the present application, ultrasonic sensors are arranged on the surfaces of the main housings of the device. By utilizing the characteristics of ultrasonic signal propagation, when internal discharge occurs, the spatial location of the discharge source can be determined by the time difference of the signals received by multiple external ultrasonic sensors. While monitoring the discharge phenomenon, the specific location of the insulation defect can also be accurately located, providing crucial information support for subsequent analysis and maintenance.

[0018] Preferably, in the present application, the monitoring points of high-frequency sensors are set at key equipotential connection lines. These equipotential lines are important nodes for testing the connection and the uniformity of the electric field distribution. Monitoring high-frequency partial discharge signals at these points can most directly reflect the electrical state of the connection part. This allows for precise monitoring of equipotential connection areas that are prone to failure due to poor contact, and timely detection of early insulation degradation caused by connection defects.

[0019] Preferably, in the present application, based on the rule that oil-immersed insulation equipment will decompose and produce specific gases under overheating or discharge failure, by tracking the composition and concentration trends of multiple dissolved gases online, latent faults inside the equipment can be diagnosed. Real-time and online monitoring of the chemical state of insulation oil can sensitively detect different types of initial fault hazards such as arc discharge and overheating.

[0020] Preferably, in the present application, a dedicated single-hydrogen sensor is added. Hydrogen is the earliest and fastest-growing gas component in oil insulation materials under corona discharge and other faults. Special monitoring of hydrogen can serve as a quick indicator of failure. This approach provides a fast and targeted failure warning indicator, especially good at early detection of low-energy-density partial discharge phenomena, and constitutes an important part of the monitoring system.

[0021] Preferably, in the present application, an offline oil sampling device is added as a supplementary means. Comparing the high-precision laboratory offline chromatographic analysis results with the online monitoring data can not only calibrate the accuracy of the online monitoring data, but also obtain more detailed gas composition information for in-depth analysis, which builds an online and offline linkage verification mechanism, greatly improves the accuracy and authority of the gas analysis results in the oil, and makes the fault diagnosis conclusion more reliable.

[0022] The present application also provides a working method of a test monitoring system for an ultra-high voltage outgoing line device, based on the above-mentioned test monitoring system for an ultra-high voltage outgoing line device, the method deploys a multi-sensor network at key positions of the tested ultra-high voltage outgoing line device, such as the high-voltage lifting seat, the shell and the test device, synchronously collects partial discharge signals and chemical composition data in the oil during the test, and then comprehensively analyzes the obtained data to evaluate the insulation state. The method uses a multi-physical quantity collaborative monitoring mechanism to correlate and verify various characterization parameters such as electricity, acoustics, optics and chemistry, thereby constructing a multi-dimensional insulation fault diagnosis model. Even under the condition of separate test without the cooperation of the transformer body, the method can realize comprehensive and accurate judgment of the insulation performance through cross-capture and intelligent analysis of various potential defect characteristic signals. This method effectively fills the technical gap in the field of separate test and verification of ultra-high voltage outgoing line devices, overcomes the obstacle that the traditional method is difficult to comprehensively evaluate the insulation reliability, and provides a scientific and reliable technical guarantee for the customized production and quality control of the equipment.

[0023] Preferably, in the present application, sensors are arranged in pairs at key positions for joint detection, or arranged on the surface of the shell for positioning. Through the standardized arrangement mode, it is ensured that the entire monitoring system can be correctly and efficiently deployed, thereby fully exerting the advantages of multi-technology fusion and realizing the comprehensive monitoring goal from signal acquisition to spatial positioning.

[0024] Preferably, in the present application, a hierarchical monitoring strategy is constructed, which includes online real-time monitoring of key gases and hydrogen, and combines offline laboratory precision analysis, that is, a gas data analysis system with complementary advantages and mutual verification is formed, which not only ensures the real-time and rapid response capability of the monitoring, but also ensures the accuracy and depth of the data through offline analysis, greatly improving the comprehensiveness and accuracy of fault diagnosis. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A structural schematic diagram of a test monitoring system for an ultra-high voltage outgoing line device is provided for an embodiment of the present application; Figure 2 A top view is provided for an embodiment of the present application; Figure 3The installation schematic view of the ultra-high frequency sensor and the optical sensor provided by the embodiment of the present application.

[0026] Reference signs: 1, first hand hole cover plate; 2, L-shaped corner; 3, second hand hole cover plate; 4, cylinder wall; 5, high-voltage outgoing device shell; 6, test device shell; 7, high-voltage lifting seat and high-voltage outgoing device equal potential line; 8, high-voltage outgoing device and test device equal potential line; 9, first valve; 10, second valve; 11, test device; 12, ultra-high frequency sensor; 13, optical sensor. DETAILED DESCRIPTION

[0027] In order to make the technical problems solved by the present application, the technical solutions and beneficial effects clearer, the following specific embodiments are used to further describe the present application. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0030] It should be noted that: similar reference signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] The following describes technical terms related to the present application: Ultra-high voltage outgoing device: a special device installed on the high-voltage side (ultra-high voltage or extra-high voltage end) of a transformer, used to lead out the high-voltage electrical energy generated by the windings inside the transformer, and connected with the external power transmission line (such as overhead line or cable) through components such as insulators and bushings, usually referring to the AC voltage level of 330kV to 1000kV.

[0032] As mentioned in the background section, existing monitoring methods cannot be used to monitor and verify the testing of ultra-high voltage outgoing line devices. This makes it impossible to accurately and comprehensively assess the insulation reliability during individual tests, which greatly hinders the manufacturing and quality control of ultra-high voltage equipment.

[0033] To address the aforementioned issues, this embodiment provides a test monitoring system for ultra-high voltage (UHV) outgoing line devices. The system comprises UHV monitoring, ultrasonic monitoring, high-frequency monitoring, oil chromatography monitoring, and single-hydrogen monitoring components. It effectively monitors the testing of high-voltage outgoing line devices and provides a precise and comprehensive assessment of the insulation reliability of UHV outgoing line devices, thereby ensuring the manufacturing and quality control of high-voltage equipment.

[0034] like Figure 1 As shown, this embodiment provides a test monitoring system for an ultra-high voltage (UHV) power line output device. One end of the UHV power line output device is connected to a test device, and the other end is connected to a high-voltage riser. The test monitoring system is installed and deployed on the UHV power line output device, the test device 11, and the high-voltage riser. Specifically, it includes multiple sensor units, which are deployed at different positions on the UHV power line output device to simultaneously monitor the discharge signal and / or changes in the chemical composition of the oil during the test. The sensor units include at least one of the following: a UHF sensor 12, an optical sensor 13, an ultrasonic sensor, and a high-frequency sensor, as well as at least one of an oil chromatography monitoring device and a single hydrogen sensor. The sensor units are deployed at predetermined locations on the high-voltage riser, the high-voltage power line output device housing 5, and the test device 11 to achieve comprehensive monitoring of the top, middle, tail, and corner areas of the UHV power line output device.

[0035] The following section provides a further explanation of the test and monitoring system for ultra-high voltage (UHV) outgoing line devices provided in this embodiment, using specific application examples: This embodiment focuses on the high-voltage outgoing line device of a 1100kV ultra-high voltage transformer. In the absence of a matching transformer body, this test monitoring system and method are used for separate test monitoring. One end of the ultra-high voltage outgoing line device is connected to the test device 11 via a flange, and the other end is fixedly connected to the high-voltage riser via bolts. The test device 11 is a customized high-voltage test platform that can provide preset test voltage and load conditions.

[0036] First, the experimental monitoring system is deployed: such as 2 and Figure 3As shown, a set of UHF sensors 12 and optical sensors 13 are installed at the first handhole cover plate 1 of the high-voltage riser, the L-shaped corner 2 of the high-voltage outlet device housing 5, and the second handhole cover plate 3 of the test device housing 6. Each set includes one UHF sensor 12 (preferred model: UHF-200, bandwidth 300MHz-1.5GHz) and one optical sensor 13 (preferred model: OP-500, response wavelength 200nm-800nm). The sensors are fixed to the preset mounting holes at each position by stainless steel flanges. Sealing gaskets are set between the flanges and the cover plate and corner surfaces to ensure insulation and sealing. The signal output terminals of the UHF sensor 12 and the optical sensor 13 are connected to the data acquisition unit (preferred model: DAQ-8000) through double-shielded cables. In this embodiment, three ultrasonic sensors (preferred model: US-300, center frequency 150kHz) are evenly arranged circumferentially on the outer surface of the cylinder wall 4 of the high-voltage riser. Two ultrasonic sensors are arranged in the middle and at the tail of the high-voltage output device housing 5. Two ultrasonic sensors are arranged on the surface of the test device housing 6 near the output end. All ultrasonic sensors are magnetically attached to the housing surface using magnetic bases. Silicone grease coupling agent is applied between the base and the housing to reduce signal attenuation. The output signals of the ultrasonic sensors are amplified by a preamplifier (gain 40dB) and then connected to the data acquisition unit. One high-frequency sensor (preferred model: HF-100, bandwidth 1MHz-100MHz) is arranged at the equipotential line 7 between the high-voltage riser and the high-voltage output device, and at the equipotential line 8 between the high-voltage output device and the test device. The high-frequency sensors are fixed to the equipotential line using metal clips. The sensor grounding terminal is reliably grounded through a grounding wire, and the signal output terminal is connected to the data acquisition unit through a coaxial cable. An oil chromatography monitoring device (preferred model: GC-2000) is installed at the first valve 9 position on the top of the high-pressure riser. The oil inlet of the oil chromatography monitoring device is connected to the oil outlet flange of the first valve 9 via a high-pressure oil pipe. The oil outlet is connected to the oil return interface of the high-pressure riser via a return oil pipe, forming an oil sample circulation loop. The oil chromatography monitoring device establishes a communication connection with the monitoring terminal via Ethernet. A single hydrogen sensor (preferred model: H2-100, measurement range 0-1000μL / L) is installed at the second valve 10 position on the top of the high-pressure riser. The single hydrogen sensor is fixedly connected to the second valve 10 via a threaded interface. The sensor's detection probe is inserted into the oil passage inside the high-pressure riser, and the collected data is transmitted to the monitoring terminal via a 485 bus.An offline oil sampling device is installed at the preset interface at the bottom of the test device 11. The offline oil sampling device includes an oil sampling pipe, a shut-off valve, and a sealed sampling bottle. One end of the oil sampling pipe is welded and fixed to the oil outlet at the bottom of the test device 11, and the other end is connected to the sealed sampling bottle through a quick connector. The shut-off valve is installed in the middle of the oil sampling pipe to control the timing and amount of oil sampling.

[0037] For example, after the system is deployed, the following steps are taken for test monitoring: Start the test device 11, gradually increase the test voltage to 1100kV according to the preset test plan, and start the data acquisition unit and all sensor units after stable operation. Set the acquisition parameters: the sampling rate of the ultra-high frequency sensor 12 is 2GHz, the sampling rate of the optical sensor 13 is 100MHz, the sampling rate of the ultrasonic sensor is 1MHz, the sampling rate of the high frequency sensor is 50MHz, the sampling interval of the oil chromatography monitoring device is 10 minutes, and the sampling interval of the single hydrogen sensor is 5 minutes. During the 24-hour test duration, the discharge signal data of the ultra-high voltage output device is collected synchronously. The discharge signal data specifically includes ultra-high frequency signals, optical signals, ultrasonic signals, high frequency partial discharge signals, and chemical composition data in the oil, specifically including the concentration of dissolved gases such as methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide, as well as the hydrogen content. The collected data is transmitted to the server for storage in real time.

[0038] During the experiment, the oil chromatography monitoring device uploaded the concentration data of each dissolved gas in real time. The monitoring terminal plotted the concentration change curve based on the data and analyzed the growth trend of the gas components. The single hydrogen sensor uploaded the hydrogen content data in real time. When the hydrogen content exceeded the preset threshold (80 μL / L), the monitoring terminal automatically issued an early warning signal. Every 2 hours, the operator opened the shut-off valve of the offline oil sampling device, collected 50 mL of oil sample, sealed the sampling bottle, and sent it to the laboratory for offline chromatographic analysis using a gas chromatograph (preferred model: Agilent 7890B) to obtain accurate gas component content data. The offline analysis results were compared with the online monitoring data to calibrate the accuracy of the online data.

[0039] After the test, insulation status analysis and evaluation were conducted based on the collected multi-source data: a weighted fusion algorithm was used to cross-verify the UHF and optical signals, and the discharge type was determined based on the amplitude and phase synchronization of the signals to determine whether corona discharge or surface discharge existed; the spatial coordinates of the discharge source were calculated using the time difference of signals received by multiple ultrasonic sensors, and the insulation defect location was accurately located by using the triangulation method; the type (overheating defect or discharge defect) and severity of the insulation defect were determined by combining the component ratios of dissolved gases in the oil (such as acetylene / ethylene ratio, methane / hydrogen ratio) and the trend of hydrogen content changes; the insulation status of the ultra-high voltage outgoing line device was graded and evaluated by combining the discharge signal analysis results and the oil gas analysis results, and a report containing the defect location, type, severity and evaluation conclusions was generated to provide technical basis for equipment quality control.

[0040] Through the experimental monitoring in this embodiment, a weak partial discharge signal at the L-shaped corner 2 of the ultra-high voltage outgoing line device was successfully captured. The defect location was determined by ultrasonic positioning. Combined with the abnormal increase in hydrogen content in the oil and the results of offline chromatographic analysis, it was accurately determined that the defect was insulation degradation caused by surface discharge. This verifies that the system and method of this embodiment can comprehensively and accurately evaluate the insulation reliability of the ultra-high voltage outgoing line device under individual test conditions, effectively filling the gap in the prior art.

[0041] In summary, the test monitoring system and method for ultra-high voltage (UHV) line-outing devices provided by this invention have the following advantages compared to existing test monitoring methods: This invention constructs a comprehensive experimental monitoring system integrating multiple sensors, including UHF, optical, ultrasonic, and high-frequency sensors, as well as oil chromatography and single-hydrogen monitoring devices, along with corresponding monitoring methods. This provides an innovative solution to the industry challenge of independent testing and verification of ultra-high voltage (UHV) line-outing devices when a matching transformer is lacking. This invention utilizes the synergistic effect of sensors based on different physical principles to achieve simultaneous multi-dimensional capture of discharge phenomena, encompassing electromagnetic, acoustic, and optical dimensions. Combined with online and offline chemical analysis of dissolved gases in the oil, it forms a comprehensive, multi-layered state-sensing network. By optimizing the placement of sensors at multiple key locations, this system and method achieves focused coverage of the entire device, particularly areas with concentrated electric fields and weak connections. Ultimately, it forms a complete evaluation system capable of cross-verification, precise positioning, and in-depth diagnosis, thereby significantly improving the comprehensiveness, accuracy, and reliability of evaluating the insulation reliability of UHV line-outing devices. This provides indispensable technical support for their customized production and rigorous quality control.

[0042] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A test and monitoring system for ultra-high voltage (UHV) outgoing line devices, characterized in that, One end of the ultra-high voltage output device is connected to the test device (11), and the other end is connected to the high voltage riser. It includes multiple sensor units, which are arranged at different positions of the ultra-high voltage output device to synchronously monitor the discharge signal and / or changes in the chemical composition of the oil during the test. The sensor unit includes at least one of the following: an ultra-high frequency sensor (12), an optical sensor (13), an ultrasonic sensor, and a high frequency sensor, as well as at least one of an oil chromatography monitoring device and a single hydrogen sensor. The sensor unit is installed in the preset locations of the high voltage riser, the high voltage output device housing (5), and the test device (11) to achieve comprehensive monitoring of the top, middle, tail, and corner areas of the ultra-high voltage output device.

2. The test monitoring system for ultra-high voltage outgoing line devices according to claim 1, characterized in that, The ultra-high frequency sensor (12) and the optical sensor (13) are set up in groups and installed at least one of the following locations: the first hand hole cover plate (1) of the high voltage riser, the L-shaped corner (2) of the high voltage outlet device housing (5), and the second hand hole cover plate (3) of the test device housing (6), for synchronous monitoring of the discharge signal during the test.

3. The test monitoring system for ultra-high voltage outgoing line devices according to claim 1, characterized in that, An ultrasonic sensor is installed at at least one location on the outer surface of the cylinder wall (4) of the high-voltage riser, the surface of the outer shell (5) of the high-voltage outlet device, and the surface of the outer shell (6) of the test device, for ultrasonic positioning of the discharge signal.

4. The test monitoring system for ultra-high voltage outgoing line devices according to claim 1, characterized in that, The high-frequency sensor is placed at the equipotential line (7) between the high-voltage riser and the high-voltage output device, and / or at the equipotential line (8) between the high-voltage output device and the test device, for synchronous monitoring of high-frequency partial discharge signals.

5. The test monitoring system for ultra-high voltage outgoing line devices according to claim 1, characterized in that, The oil chromatography monitoring device is installed at the first valve (9) position on the top of the high-pressure riser to monitor the changes in dissolved gas in the oil during the test.

6. The test monitoring system for ultra-high voltage outgoing line devices according to claim 1, characterized in that, A single hydrogen sensor is installed at the second valve (10) position on the top of the high-pressure riser to monitor the change in hydrogen content in the oil during the test.

7. The test monitoring system for ultra-high voltage outgoing line devices according to claim 1, characterized in that, It also includes an offline oil sampling device, which is installed at the bottom of the test device (11) and is used to perform offline chromatographic analysis of dissolved gases in the oil during the test.

8. A test monitoring method for ultra-high voltage and extra-high voltage outgoing line devices, characterized in that, The test monitoring system for ultra-high voltage outgoing line devices according to any one of claims 1-7 includes: Multiple sensor units are arranged at predetermined positions on the high-voltage riser, the high-voltage outlet device housing, and the test device. During the experiment, the sensor unit was used to simultaneously collect discharge signal data and / or oil chemical composition data of the ultra-high voltage outgoing line device. Based on the collected data, the insulation status of ultra-high voltage outgoing line devices is analyzed and evaluated.

9. A test monitoring method for ultra-high voltage outgoing line devices according to claim 8, characterized in that, The multiple sensor units arranged at predetermined positions on the high-voltage riser, the high-voltage outlet device housing, and the test device include: At least one location is provided with an ultra-high frequency sensor (12) and an optical sensor (13) at the first handhole cover plate (1) of the high voltage riser, at the L-shaped corner (2) of the high voltage outlet device housing (5), and at the second handhole cover plate (3) of the test device housing (6) to synchronously collect discharge signals at different locations. An ultrasonic sensor is arranged at least at one of the following locations: the outer surface of the cylinder wall (4) of the high-voltage riser, the surface of the housing (5) of the high-voltage outlet device, and the surface of the housing (6) of the test device, for spatial positioning of the discharge signal; High-frequency sensors are arranged at the equipotential line (7) between the high-voltage riser and the high-voltage outlet device, and / or at the equipotential line (8) between the high-voltage outlet device and the test device, to collect high-frequency partial discharge signals.

10. A test monitoring method for ultra-high voltage outgoing line devices according to claim 8, characterized in that, It also includes the process of gas analysis and monitoring in oil, with the following specific steps: Using the oil chromatography monitoring device installed on the first valve (9) at the top of the high-pressure riser, the changes in the content of various dissolved gases in the oil during the test were monitored in real time; The change in hydrogen content in the oil is monitored in real time using a single hydrogen sensor installed on the second valve (10) at the top of the high-pressure riser. Oil samples were obtained using an offline oil sampling device located at the bottom of the test apparatus (11) and offline chromatographic analysis was performed to use the analysis results as supplementary verification data for online monitoring data.

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