An insulation level online evaluation method applied to a vehicle-mounted metal closed device

Abstract

The application discloses an insulation level online evaluation method applied to a vehicle-mounted metal closed device, which comprises an insulation main body, a grounding shielding layer, flexible insulation glue, a monitoring sensor, a terminal processor and a background data analysis center; the grounding shielding layer is uniformly arranged on the outer surface of the insulation main body, the local area of the insulation main body, where the monitoring sensor is arranged, is not provided with the grounding shielding layer, the shell of the monitoring sensor is annularly contacted with the grounding shielding layer after the monitoring sensor is arranged, the shell of the monitoring sensor and the grounding shielding layer completely wrap the insulation main body to form the metal closed device, the flexible insulation glue is filled between the bottom surface of the monitoring sensor and the insulation main body, the terminal processor is arranged near the insulation main body and is used with the vehicle, signal transmission is realized through wired connection between the terminal processor and the monitoring sensor, and data exchange is realized through wireless connection between the terminal processor and the background data analysis center. The metal closed grounding shielding effect and the partial discharge detection precision of the insulation main body can be considered, the monitoring principle is scientific and reasonable, the structure is simple and reliable, the shielding effect is good, the anti-interference capability is strong, the detection sensitivity is high, the cost is low, economic benefits are outstanding, and technical progress is remarkable.

Description

TECHNICAL FIELD

[0001] The application relates to a high-voltage insulation monitoring and evaluation technology, in particular to an insulation level online evaluation method applied to a vehicle-mounted metal-enclosed device. BACKGROUND

[0002] At present, the intelligent degree of rail transit locomotive vehicles is gradually improved, and the intelligent technology is obviously improved. However, from the system board block of the whole vehicle, as a key system affecting the driving order and driving safety, the intelligent level of the high-voltage system is slightly insufficient, especially the insulation level of the important high-voltage component, which has a large space for excavation and research.

[0003] On the other hand, the external insulation of the high-voltage system and components of the locomotive vehicle is mainly pure air insulation or composite insulation, and there is an application bottleneck for specific environments such as high altitude. The metal-enclosed device of solid insulation is a new iteration technology of the vehicle-mounted high-voltage system and is also the development direction in the future.

[0004] In view of the above status, while meeting the future development needs of the vehicle-mounted high-voltage system technology, it is necessary to invent an insulation level online monitoring and evaluation method applied to a vehicle-mounted metal-enclosed device, which provides strong support for the iteration technology of the next generation of locomotive vehicle high-voltage system.

[0005] Therefore, the application is proposed. SUMMARY

[0006] The application provides an insulation level online evaluation method applied to a vehicle-mounted metal-enclosed device, which can consider the grounding shielding effect of the metal-enclosed device and the partial discharge detection precision of the insulation main body, has scientific and reasonable monitoring principles, simple and reliable structure, good shielding effect, strong anti-interference ability, high detection sensitivity, low cost, outstanding economic benefits and significant technical progress.

[0007] The application is achieved by the following technical scheme.

[0008] The insulation level online evaluation method applied to the vehicle-mounted metal-enclosed device comprises an insulation main body, a grounding shielding layer, a flexible insulation glue, a monitoring sensor, a terminal processor and a background data analysis center.

[0009] The ground shielding layer is uniformly arranged on the outer surface of the insulating body, wherein a local area of the insulating body on which the monitoring sensor is arranged is not provided with the ground shielding layer, the outer shell of the monitoring sensor is in annular contact with the ground shielding layer after the monitoring sensor is arranged, the monitoring sensor shell and the ground shielding layer completely wrap the insulating body to form a metal closed device, the flexible insulating glue is filled between the bottom surface of the monitoring sensor and the insulating body, and the terminal processor is arranged near the insulating body and is used on the vehicle, performs signal transmission with the monitoring sensor through wired connection, and performs data exchange with the background data analysis center through wireless connection.

[0010] As can be seen from the technical solutions provided by the application, the application of the insulating level online evaluation method for the vehicle-mounted metal closed device provided by the embodiment of the application can not only ensure the grounding shielding effect of the metal closed device, but also reserve a signal collection channel of the monitoring sensor to the insulating body, improve the insulating reliability and detection accuracy, and research the insulating level online evaluation method for the vehicle-mounted metal closed device which has scientific and reasonable monitoring principles, simple and reliable structure, strong anti-interference ability, high detection sensitivity and low cost, and develop an online monitoring module, thereby achieving outstanding economic benefits, significant technical progress, wide application value and a wide market. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 The application of the insulating level online evaluation method for the vehicle-mounted metal closed device provided by the embodiment of the application is shown in the structural principle diagram.

[0012] Fig. 2 The monitoring sensor and the insulating body provided by the embodiment of the application are shown in the assembled top view.

[0013] In the drawings:

[0014] 1. Insulating body, 2. Ground shielding layer, 3. Flexible insulating glue, 4. Monitoring sensor, 5. Terminal processor, 6. Background data analysis center. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application; obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application, which does not constitute a limitation on the application. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0016] First, the terms that can be used in the text are described as follows:

[0017] The term "and / or", "and / or" means either one or both of the conjuncted terms. For example, X and / or Y means that the three cases including "X", "Y" and "X and Y" are all included.

[0018] The terms "comprising", "containing", "including", "having" or other similar semantic descriptions should be interpreted to be non-exclusive inclusion. For example, the inclusion of a technical feature element (such as raw materials, components, ingredients, carriers, dosage forms, materials, sizes, parts, components, mechanisms, devices, steps, processes, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or articles, etc.) should be interpreted as not only including the explicitly listed technical feature element, but also including other technical feature elements not explicitly listed but known in the art.

[0019] The term "consisting of" means excluding any technical feature element not explicitly listed. If this term is used in a claim, the term will make the claim closed, so that it does not contain technical feature elements other than those explicitly listed, except for conventional impurities associated therewith. If the term only appears in a certain clause of the claim, it only limits the elements explicitly listed in that clause, and the elements described in other clauses are not excluded from the overall claim.

[0020] Unless otherwise explicitly specified or limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly, for example: it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this text can be understood according to the specific circumstances.

[0021] The terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of description, and does not mean that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on this text.

[0022] The contents not described in detail in the embodiments of the present application belong to the prior art known to those skilled in the art. If the specific conditions are not specified in the embodiments of the present application, they are carried out according to the conventional conditions in the art or the conditions recommended by the manufacturer. If the reagents or instruments used in the embodiments of the present application are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0023] The application relates to an insulation level online evaluation method applied to a vehicle-mounted metal closed device.

[0024] The ground shielding layer is uniformly arranged on the outer surface of the insulation main body, wherein the local area of the insulation main body, on which the monitoring sensor is arranged, is not provided with the ground shielding layer, the outer shell of the monitoring sensor is in annular contact with the ground shielding layer after installation, the monitoring sensor shell and the ground shielding layer completely cover the insulation main body to form a metal closed device, the flexible insulation glue is filled between the bottom surface of the monitoring sensor and the insulation main body, the terminal processor is installed near the insulation main body and is used on the vehicle, signal transmission is realized between the monitoring sensor and the terminal processor through wired connection, and data exchange is realized between the terminal processor and the background data analysis center through wireless connection.

[0025] The monitoring sensor is a conductive metal shell, is in good contact with the ground shielding layer, and completely covers the insulation main body, and a signal acquisition channel without the ground shielding layer is arranged between the monitoring sensor and the insulation main body.

[0026] The gap area among the monitoring sensor, the insulation main body and the ground shielding layer is filled with the flexible insulation glue, the flexible insulation glue has low hardness and insulation performance at the same time, and good contact between the monitoring sensor and the ground shielding layer is ensured while the gap is filled.

[0027] The monitoring sensor preferably selects a very high frequency sensor.

[0028] The terminal processor and the monitoring sensor jointly realize preliminary evaluation of potential failure modes, and after final evaluation by the background data analysis center, early warning and judgment are performed according to a set threshold value.

[0029] In the application,

[0030] The monitoring sensor is a conductive metal shell, is in good contact with the ground shielding layer, and completely covers the insulation main body, and a signal acquisition channel without the ground shielding layer is arranged between the monitoring sensor and the insulation main body.

[0031] The gap between the monitoring sensor, the insulating body, and the grounding shield is filled with the flexible insulating adhesive to prevent air gaps from interfering with the insulation level and detection accuracy. The flexible insulating adhesive has both low hardness and insulating properties, ensuring that the gap is filled without affecting the good contact between the monitoring sensor and the grounding shield. In the final state, the flexible insulating adhesive is in a compressed state.

[0032] The monitoring sensor is preferably an ultra-high frequency sensor, which takes advantage of its strong anti-interference ability and high sensitivity to adapt to complex vehicle operating conditions.

[0033] The terminal processor and the monitoring sensors work together to perform a preliminary assessment of potential failure modes. The terminal processor is set to a multi-channel mode, which can receive signals and data from multiple monitoring sensors, facilitating abnormal fault location and comparison logic design. After final evaluation by the background data analysis center, warnings and judgments are issued based on set thresholds. The background data analysis center can monitor and analyze data in real time to perform health management of the vehicle-mounted metal enclosure equipment.

[0034] In summary, the online insulation level assessment method for vehicle-mounted metal-enclosed equipment according to the embodiments of the present invention has an ingenious structure and principle, balancing insulation performance and detection accuracy. By reserving a signal acquisition channel that avoids the grounding shield layer, it significantly improves the quality of monitoring data and has strong practicality. The monitoring sensors can be easily replaced individually, and the matching and combination with the terminal processor are flexible and versatile. The idea of ​​the monitoring sensors and the grounding shield layer forming a metal enclosure is innovative, highly reliable, and has obvious technical advantages. The entire monitoring module is low in cost, has outstanding economic benefits, and has broad application prospects.

[0035] To more clearly demonstrate the technical solution and its effects provided by the present invention, the embodiments of the present invention will be described in detail below with reference to specific examples.

[0036] Example 1

[0037] like Figs. 1-2As shown, the application is applied to the insulation level online evaluation method of the vehicle-mounted metal closed device, which comprises an insulation body 1, a grounding shielding layer 2, a flexible insulation glue 3, a monitoring sensor 4, a terminal processor 5 and a background data analysis center 6. The insulation body 1, the grounding shielding layer 2, the flexible insulation glue 3, the monitoring sensor 4 and the terminal processor 5 are installed on the locomotive vehicle and the motor train unit, which belong to the vehicle-mounted part. The background data analysis center 6 is arranged at a ground specified position convenient for observation and operation, which belongs to the remote background part. The grounding shielding layer 2 is uniformly arranged on the outer surface of the insulation body 1. The grounding shielding layer 2 can adopt different process modes and can be a conductive or semi-conductive medium. In this embodiment, the grounding shielding layer is a semi-conductive medium, which is coated by a post-pressing process. The local area of the insulation body 1 where the monitoring sensor 4 is installed is not provided with the grounding shielding layer 2. The outer shell of the monitoring sensor 4 is in annular contact with the grounding shielding layer 2 after installation. The outer shell of the monitoring sensor 4 and the grounding shielding layer 2 completely coat the insulation body 1 to form a metal closed device. In this embodiment, the metal closed device comprises a vacuum circuit breaker, a high-voltage disconnector, a grounding switch, a voltage transformer and a surge arrester. The flexible insulation glue 3 is filled between the bottom surface of the monitoring sensor 4 and the insulation body 1. The terminal processor 5 is installed near the insulation body 1 and is used with the vehicle. The terminal processor 5 is connected with the monitoring sensor 4 through a wire for signal transmission and is connected with the background data analysis center 6 through a wireless connection for data exchange.

[0038] The monitoring sensor 4 is a conductive metal shell, which is in good contact with the grounding shielding layer 2. The process precision is used to ensure that the contact surfaces of the two are completely and tightly attached, and the insulation body 1 is completely coated. At the same time, a signal acquisition channel without the grounding shielding layer 2 is arranged between the monitoring sensor 4 and the insulation body 1. The reserved area of the acquisition channel matches the built-in module of the monitoring sensor 4. In this embodiment, the monitoring sensor 4 is an aluminum alloy conductive oxidized shell. The reserved area of the acquisition channel and the built-in module of the monitoring sensor 4 have the same area, which is a square area of 36mm x 26mm.

[0039] The gap area between the monitoring sensor 4, the insulation body 1 and the grounding shielding layer 2 is filled with the flexible insulation glue 3 to avoid the interference and influence of air gap on the insulation level and detection accuracy. The flexible insulation glue 3 has low hardness and insulation performance at the same time, which ensures that the gap is filled without affecting the good contact between the monitoring sensor 4 and the grounding shielding layer 2. In the final state, the flexible insulation glue 3 is in a compressed state. In this embodiment, the flexible insulation glue 3 is selected as a silicone rubber gel with a Shore hardness of 20 degrees. The monitoring sensor 4 and the insulation body 1 are tightly fastened by bolts to ensure good contact, and at the same time, the flexible insulation glue 3 is compressed to ensure the filling effect of the gap area.

[0040] The monitoring sensor 4 preferentially selects a very high frequency sensor, and utilizes the technical advantages of strong anti-interference ability, high sensitivity and fine filtering algorithm to adapt to the complex working conditions of the vehicle. In the embodiment, the monitoring sensor 4 adopts a side outlet mode, which is convenient for overall wiring and assembly and disassembly of the metal enclosed equipment.

[0041] The terminal processor 5 and the monitoring sensor 4 jointly realize preliminary evaluation of potential failure modes. The terminal processor 5 is set to a multi-channel mode, can receive signals and data of multiple monitoring sensors, is convenient for abnormal fault positioning and comparison logic design, and after final evaluation by the background data analysis center 6, performs early warning and evaluation according to a set threshold. The background data analysis center 6 can monitor and analyze application data in real time, and performs health management on the vehicle-mounted metal enclosed equipment. In the embodiment, the terminal processor 5 is in a four-channel mode, and is respectively installed on a vacuum circuit breaker, a high-voltage disconnector and a grounding switch. The terminal processor 5 can preliminarily locate the component where the fault occurs. The background data analysis center 6 can provide evaluation suggestions in combination with data comparison, and divides the evaluation suggestions into four qualitative conclusions of “continue to use”, “use observation”, “use repair and update” and “immediately update”.

[0042] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for on-line evaluation of insulation level applied to a metallic closed equipment on board, characterized in that, The device comprises an insulating body, a grounding shield layer, flexible insulating glue, a monitoring sensor, a terminal processor and a background data analysis center. The grounding shield layer is evenly arranged on the outer surface of the insulating body, wherein the local area of the insulating body where the monitoring sensor is installed is not provided with the grounding shield layer, the shell of the monitoring sensor is in annular contact with the grounding shield layer after installation, the monitoring sensor shell and the grounding shield layer completely cover the insulating body to form a metal closed device, the flexible insulating glue is filled between the bottom surface of the monitoring sensor and the insulating body, the terminal processor is installed near the insulating body and is used on the vehicle, signal transmission is performed between the terminal processor and the monitoring sensor through wired connection, and data exchange is performed between the terminal processor and the background data analysis center through wireless connection. The monitoring sensor is a conductive metal shell, which is in good contact with the grounding shield layer and completely covers the insulating body, and a signal acquisition channel without the grounding shield layer is arranged between the monitoring sensor and the insulating body. The gap area among the monitoring sensor, the insulating body and the grounding shield layer is filled with the flexible insulating glue, which has low hardness and insulation performance, so as to ensure that the gap is filled without affecting the good contact between the monitoring sensor and the grounding shield layer. The terminal processor and the monitoring sensor jointly realize preliminary evaluation of potential failure modes, and the background data analysis center performs final evaluation, and according to the set threshold, prewarning and judgment are performed.

2. The insulation level online evaluation method for a vehicle-mounted metal-enclosed equipment according to claim 1, characterized in that, The monitoring sensor preferentially selects a very high frequency sensor.

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