Sleeve state intelligent monitoring device

Abstract

The utility model relates to the technical field of bushing monitoring, in particular to an intelligent bushing state monitoring device, which is mounted on a bushing end screen for use and comprises a sleeve-shaped metal outer cover main body, an inner shielding structure is arranged at the rear end of the metal outer cover main body, and a data acquisition component is arranged in the inner shielding structure. The data acquisition part is a mutual inductor and / or a sensor; a grounding extension rod is arranged in the data acquisition part in a penetrating manner, extends out of the data acquisition part, and is fixedly connected with one end of the metal elastic sheet; and the other end of the metal elastic sheet is movably connected with a grounding guide rod of the bushing end screen, and the grounding guide rod and the grounding extension rod are coaxially arranged. According to the utility model, the leakage current of the end screen of the bushing is acquired through the data acquisition part, the loss of the bushing medium can be conveniently calculated according to the acquired power frequency current and voltage, and the partial discharge monitoring effect of the bushing can be realized according to the acquired high frequency current.

Description

Technical Field

[0001] The utility model relates to the technical field of casing monitoring, in particular to an intelligent casing state monitoring device. Background Art

[0002] The transformer is the core equipment in the substation, and the safe and stable operation of the transformer bushing is of great significance to the power grid. During the operation of the transformer bushing, faults such as overheating, low oil level, and partial discharge may occur. It is necessary to monitor the operating status of the bushing to determine whether there is an abnormality, so as to achieve early warning and timely handle the fault in the embryonic stage. By online monitoring of the bushing's capacitance, dielectric loss, leakage current and other data, reliable data support can be provided for the online maintenance of the transformer bushing.

[0003] In recent years, transformer status online monitoring technologies represented by online monitoring devices for dissolved gas in oil and online monitoring devices for high-frequency partial discharge have been put into use one after another, which have achieved the measurable and knowable defects of transformers under operating conditions to a certain extent, and have accumulated certain operating data. However, through investigation, it was found that there are still some problems with the current on-site online monitoring equipment:

[0004] First, there are blind spots in monitoring, and the monitoring of key parts of the transformer is missing. The transformer bushing is the component with the highest failure rate in the transformer. Statistics show that more than 70% of transformer failures are caused by transformer bushing failures. However, there has been a lack of effective means to monitor the insulation status of the bushing.

[0005] Second, the anti-interference ability is poor, and the support for the actual operation and maintenance work on site is insufficient. The electromagnetic environment on site of substations, especially UHV substations and converter stations, is complex, and there are many interference sources of the same nature. Existing technologies are difficult to eliminate interference signals, resulting in a large number of false alarms in on-site operating devices. Alarm signals require on-site diagnosis and analysis by high-voltage test personnel. Online monitoring devices are of limited help to operation and maintenance work, but they increase the workload of identifying effective early warning information.

[0006] Third, data is isolated and data driving force is insufficient. Most existing monitoring devices specifically modulate sensors and signal processing circuits for a single characteristic quantity of a single signal, and the collected data is a discrete characteristic quantity, which is only valid for a specific monitoring device. Multi-source data are isolated from each other, and multi-type data cannot be associated and organized, and the comprehensive diagnostic and analysis capabilities are insufficient. At the same time, the stock data becomes invalid data, which cannot drive the application and development of new technologies such as big data and artificial intelligence in the field of online monitoring. Utility Model Content

[0007] The invention purpose of the utility model is to solve the problems existing in the prior art and provide an intelligent monitoring device for casing status.

[0008] In order to solve the problems existing in the prior art, the utility model adopts the following technical solutions:

[0009] A casing state intelligent monitoring device is installed on a casing end screen for use, the casing state intelligent monitoring device comprises a sleeve-shaped metal outer cover body, the rear end of the metal outer cover body is provided with an inner shielding structure, the inner shielding structure is provided with a data acquisition component, and the data acquisition component is a mutual inductor and / or a sensor;

[0010] A grounding extension rod is inserted into the data acquisition component, the grounding extension rod extends out of the data acquisition component, and the grounding extension rod is fixedly connected to one end of the metal spring;

[0011] The other end of the metal spring is movably connected to the grounding guide rod of the bushing end screen, and the grounding guide rod and the grounding extension rod are coaxially arranged.

[0012] As an improvement of the technical solution of the intelligent monitoring device for casing status of the utility model, the front end of the metal outer cover body is connected to the casing end screen base;

[0013] The bushing end screen base is penetrated by the grounding rod, and the end of the grounding rod is clamped between at least two metal spring sheets.

[0014] As an improvement on the technical solution of the intelligent monitoring device for casing status of the utility model, an insulating cover is also provided inside the metal outer cover body, the outer side of the insulating cover is fitted with the inner wall of the metal outer cover body, the metal spring sheet is fixed in the insulating cover, and the end of the grounding extension rod passes through the insulating cover and is fixedly connected to the metal spring sheet.

[0015] As an improvement on the technical solution of the intelligent casing status monitoring device of the utility model, the metal outer cover body includes a step arranged on the casing end screen base, a connecting section is arranged on one side of the step, the connecting section extends into the casing end screen base, the connecting section is threadedly connected to the casing end screen base, a threaded section is arranged between the connecting section and the casing end screen base, and the length of the threaded section is 12-25 mm.

[0016] As an improvement of the technical solution of the casing state intelligent monitoring device of the utility model, a sealing ring is arranged between the step and the casing end screen base.

[0017] As an improvement of the technical solution of the intelligent bushing status monitoring device of the utility model, the insulating cover is a polytetrafluoroethylene insulating cover.

[0018] As an improvement of the technical solution of the intelligent bushing status monitoring device of the utility model, the inner shielding structure is an inner shielding structure made of metal material.

[0019] As an improvement of the technical solution of the intelligent casing status monitoring device of the utility model, a rear end cover is provided at the rear end of the metal outer cover body, and a signal connector is provided on the outer side of the rear end cover.

[0020] As an improvement of the technical solution of the intelligent casing status monitoring device of the utility model, the signal connector is an aviation connector.

[0021] As an improvement of the technical solution of the intelligent bushing status monitoring device of the utility model, the mutual inductor is a through-type current mutual inductor, and the sensor is a high-frequency current sensor.

[0022] Beneficial effects of the utility model:

[0023] In the utility model, the leakage current of the end screen of the bushing is collected by the data collection component, and the loss of the bushing medium is calculated based on the collected power frequency current and voltage, so as to achieve the effect of partial discharge monitoring of the bushing based on the collected high frequency current. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 for Figure 1 AA cross-sectional structure schematic diagram.

[0026] Explanation of the reference numerals: 1- bushing end screen base; 2- metal outer cover body; 3- inner shielding structure; 4- data acquisition component; 5- grounding extension rod; 6- grounding guide rod; 7- metal spring; 8- insulating cover; 9- step; 10- sealing ring; 11- rear end cover; 12- signal connector. DETAILED DESCRIPTION

[0027] In order to make the invention purpose, technical scheme and beneficial effects of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments.

[0028] like Figure 1 and Figure 2As shown, a casing state intelligent monitoring device is installed on the casing end screen for use, and the casing state intelligent monitoring device includes a sleeve-shaped metal outer cover body 2, the rear end of the metal outer cover body 2 is provided with an inner shielding structure 3, and a data acquisition component 4 is provided in the inner shielding structure 3, and the data acquisition component 4 is a mutual inductor and / or a sensor; a grounding extension rod 5 is inserted into the data acquisition component 4, and the grounding extension rod 5 extends out of the data acquisition component 4, and the grounding extension rod 5 is fixedly connected to one end of a metal spring 7;

[0029] The other end of the metal spring 7 is movably connected to the grounding guide rod 6 of the bushing end screen, and the grounding guide rod 6 and the grounding extension rod 5 are coaxially arranged.

[0030] In the utility model, the leakage current of the bushing end screen is collected by the data collection component 4, and the loss of the bushing medium is calculated based on the collected power frequency current and voltage, so as to achieve the effect of partial discharge monitoring of the bushing based on the collected high frequency current.

[0031] Among them, preferably, in the present invention, the transformer is a through-type current transformer, and the sensor is a high-frequency current sensor.

[0032] In detail, the data acquisition component 4 in the utility model is preferably a through-type current transformer or a high-frequency current sensor. Most preferably, the data acquisition component 4 is a through-type current transformer and a high-frequency current sensor, so that the through-type current transformer and the high-frequency current sensor are integrated in the utility model, and the electromagnetic induction principle is used to realize the collection and capture of leakage current and partial discharge high-frequency signals. Through the collected and / or captured data signals, it is convenient to calculate the loss of the bushing medium, and according to the collected high-frequency current, the effect of partial discharge monitoring of the bushing is realized.

[0033] In some embodiments of the utility model, the front end of the metal outer cover body 2 is connected to the bushing end screen base 1; the bushing end screen base 1 is penetrated by a grounding guide rod 6, and the end of the grounding guide rod 6 is clamped between at least two metal spring sheets. Under the action of the metal spring sheet 7, the connection between the grounding guide rod 6 and the grounding extension rod 5 is facilitated. At the same time, when the three are connected, the current flow channel formed does not affect the flow of current, nor does it affect the subsequent collection effect of current data.

[0034] Furthermore, an insulating cover 8 is also provided inside the metal cover body 2, the outer side of the insulating cover 8 is in contact with the inner wall of the metal cover body 2, the metal spring 7 is fixed in the insulating cover 8, and the end of the grounding extension rod 5 passes through the insulating cover and is fixedly connected to the metal spring 7. Under the action of the insulating cover 8, current loss is avoided, and the accuracy of current data collection is guaranteed. Among them, one end of the grounding extension rod 5, the insulating cover 8 and the metal spring 7 are fixed together in the metal cover body 2 by a nut.

[0035] Preferably, the insulating cover 8 is a polytetrafluoroethylene insulating cover 8, and the main function of the polytetrafluoroethylene insulating cover 8 is to provide electrical insulation protection to prevent problems such as current leakage and electrical short circuit. It has good electrical insulation performance and can effectively isolate electrical equipment and electronic components from contact with the external environment, thereby ensuring the normal operation and safe use of the equipment.

[0036] Furthermore, the metal cover body 2 includes a step 9 arranged on the casing end screen base 1, a connecting section is arranged on one side of the step 9, the connecting section extends into the casing end screen base 1, the connecting section is threadedly connected to the casing end screen base 1, a threaded section is arranged between the connecting section and the casing end screen base 1, and the length of the threaded section is 12-25mm. In this way, under the action of the threaded section, not only the connection effect between the casing end screen base 1 and the metal cover body 2 is achieved, but also because the length of the threaded section is longer than the length of the existing threaded connection, the mechanical strength of the utility model is improved. Preferably, an interference design is adopted in the threaded section to avoid the occurrence of virtual connection and the like, which is conducive to achieving the reliable grounding and good connection effect of the casing end screen.

[0037] Furthermore, a sealing ring 10 is provided between the step 9 and the casing end screen base 1. Preferably, the sealing ring 10 is a U-shaped groove and an O-shaped nitrile rubber sealing ring 10, which ensures the sealing performance between the device and the casing end screen under extremely harsh working conditions such as high temperature, high oil, humidity, and large temperature difference, and avoids the potential safety hazards caused by adverse environmental factors to the casing operation to a great extent.

[0038] It should be noted here that the step 9 and the casing end screen base 1 are sealed by a sealing component, and the sealing component can be a sealing ring 10 or a sealing gasket. However, in order to better match the shape of the connection between the sleeve-shaped metal outer cover body 2 and the casing end screen base 1, a ring-shaped sealing component is preferably used.

[0039] In some embodiments of the utility model, the inner shielding structure 3 is an inner shielding structure 3 made of metal material, and a double-layer structure of a metal shielding structure and a metal outer cover body 2 is used to shield interference signals from a strong magnetic field environment of the substation, thereby ensuring that the collected signals are authentic and effective.

[0040] Preferably, the inner shielding structure 3 and the metal outer cover body 2 are interference-fitted to ensure the reliability of grounding.

[0041] A rear end cover 11 is disposed at the rear end of the metal housing body 2 , and a signal connector 12 is disposed on the outer side of the rear end cover 11 . The leakage current signal is led out through the signal connector 12 without affecting the grounding effect.

[0042] Preferably, the signal connector 12 is an aviation connector, and the collected signal is firmly and reliably connected to the outside through an aviation plug for use in online monitoring of the casing status.

[0043] When the utility model is in use, the leakage current of the bushing end screen flows from the grounding guide rod 6 through the metal spring 7, the grounding extension rod 5, the inner shielding structure 3, the metal outer cover body 2 and the bushing end screen base 1 in sequence, achieving an equipotential connection with the earth, that is, achieving a reliable grounding effect.

[0044] In the utility model, through the setting of the data acquisition component 4, the principle of electromagnetic induction is used to realize the collection and capture of leakage current and local discharge high-frequency signals; the double-layer structure of the internal metal shielding structure and the metal outer cover combination is used to shield the interference signal of the strong magnetic field environment of the substation, ensuring the authenticity and effectiveness of the collected signal, and the collected signal is used for online monitoring of the status of the external stable and reliable connection casing through the aviation connector, which solves the problems existing in the prior art.

[0045] Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the utility model.

Claims

1. A casing status intelligent monitoring device, installed on the casing end screen, characterized in that: The casing state intelligent monitoring device comprises a sleeve-shaped metal outer cover body, the rear end of the metal outer cover body is provided with an inner shielding structure, the inner shielding structure is provided with a data acquisition component, and the data acquisition component is a mutual inductor and / or a sensor; A grounding extension rod is inserted into the data acquisition component, the grounding extension rod extends out of the data acquisition component, and the grounding extension rod is fixedly connected to one end of the metal spring; The other end of the metal spring is movably connected to the grounding guide rod of the bushing end screen, and the grounding guide rod and the grounding extension rod are coaxially arranged.

2. The casing status intelligent monitoring device according to claim 1, characterized in that: The front end of the metal outer cover body is connected to the casing end screen base; The bushing end screen base is penetrated by the grounding rod, and the end of the grounding rod is clamped between at least two metal spring sheets.

3. The casing status intelligent monitoring device according to claim 2, characterized in that: An insulating cover is also provided inside the metal outer cover body, the outer side of the insulating cover is in contact with the inner wall of the metal outer cover body, the metal spring is fixed in the insulating cover, and the end of the grounding extension rod passes through the insulating cover and is fixedly connected to the metal spring.

4. The casing status intelligent monitoring device according to claim 2, characterized in that: The metal outer cover body includes a step arranged on the casing end screen base, a connecting section is arranged on one side of the step, the connecting section extends into the casing end screen base, the connecting section is threadedly connected to the casing end screen base, a threaded section is arranged between the connecting section and the casing end screen base, and the length of the threaded section is 12-25 mm.

5. The casing status intelligent monitoring device according to claim 4, characterized in that: A sealing ring is arranged between the step and the casing end panel base.

6. The casing status intelligent monitoring device according to claim 3, characterized in that: The insulating cover is a polytetrafluoroethylene insulating cover.

7. The casing status intelligent monitoring device according to claim 1, characterized in that: The inner shielding structure is an inner shielding structure made of metal material.

8. The casing status intelligent monitoring device according to claim 1, characterized in that: A rear end cover is arranged at the rear end of the metal housing body, and a signal connector is arranged on the outer side of the rear end cover.

9. The casing status intelligent monitoring device according to claim 8, characterized in that: The signal connector is an aviation connector.

10. The casing status intelligent monitoring device according to claim 1, characterized in that: The mutual inductor is a through-type current mutual inductor, and the sensor is a high-frequency current sensor.

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