Leakage current test auxiliary device and test system for lightning arrester in box transformer substation
By installing an auxiliary device for leakage current testing with insulating tubes and test leads inside the transformer substation, leakage current testing of the surge arrester can be performed without disassembly, solving the problems of time-consuming and labor-intensive maintenance and safety hazards, and improving maintenance efficiency and safety.
Patent Information
- Application Number
- CN202422882729.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-25
AI Technical Summary
In the existing technology, the maintenance of surge arresters requires disassembly for leakage current testing, which is time-consuming, labor-intensive, inefficient, and poses safety hazards.
An auxiliary device for leakage current testing of surge arresters in a transformer substation is provided, comprising an insulating tube and test leads. The insulating tube is spaced apart from the surge arrester, and the test leads are sleeved on the outside of the insulating tube to connect the surge arrester and a high-voltage generator, enabling leakage current testing without disassembling the surge arrester.
It shortened maintenance time, improved maintenance efficiency, ensured electrical safety, prevented leakage current and electric shock accidents, and enhanced maintenance safety.
Smart Images
Figure CN223650577U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power detection, in particular to a leakage current test auxiliary device and test system for a lightning arrester in a box transformer. BACKGROUND
[0002] The box transformer is used for switching operation and control in the process of power conversion and distribution to distribute power to the power distribution network, and is one of the indispensable devices in the power system. In order to ensure the electrical safety of the box transformer, a lightning arrester is usually arranged in the box transformer.
[0003] The lightning arrester needs to be regularly inspected and maintained. The conventional maintenance operation needs to disassemble the lightning arrester from the box transformer and concentrate it to a safe area. However, the lightning arrester has a short maintenance period, and the conventional maintenance method is time-consuming and laborious, and the maintenance efficiency is low. CONTENT OF THE UTILITY MODEL
[0004] In view of the above problems, the present application provides a leakage current test auxiliary device and test system for a lightning arrester in a box transformer, which realizes leakage current test without disassembling the lightning arrester, improves the maintenance efficiency, prevents the occurrence of leakage current or electric shock accidents, and improves the maintenance safety.
[0005] The present application provides a leakage current test auxiliary device for a lightning arrester in a box transformer, which is used to connect the lightning arrester and a high-voltage generator, and comprises:
[0006] An insulating tube is arranged at intervals with the lightning arrester in the box transformer;
[0007] A test lead is fixed to the insulating tube, and both ends of the test lead are connected with the lightning arrester and the high-voltage generator, respectively.
[0008] The leakage current test auxiliary device is arranged to realize leakage current test without disassembling the lightning arrester, shorten the maintenance time, improve the maintenance efficiency, and the design of the insulating tube and the test lead considers the electrical safety factor, avoids the discharge of the high-voltage lead due to insufficient safety distance caused by the narrow space in the box transformer, prevents the occurrence of leakage current or electric shock accidents, and improves the maintenance safety.
[0009] In some possible implementations, the insulating tube is sleeved on the outside of the test lead.
[0010] In this way, when the insulating tube is sleeved on the outside of the test lead, a double-insulated barrier is formed, which further improves the electrical safety during the test.
[0011] In some possible implementation manners, the test lead comprises a first end connected with a lead of the lightning arrester and a second end connected with a lead of the high-voltage generator.
[0012] The first end and the second end both extend to the outside of the insulating tube.
[0013] The two ends of the test lead extend to the outside of the insulating tube, so that the operator can complete the connection with the lightning arrester and the high-voltage generator without opening or moving the insulating tube, improving the convenience and efficiency of operation. In addition, the connection points of the test lead are arranged outside the insulating tube, which can reduce the need for the operator to work inside the box transformer, thereby reducing the risk of electric shock and mechanical injury and further improving the safety during the test.
[0014] In some possible implementation manners, the test lead is a conductive cloth.
[0015] In this way, the test lead has excellent electrical conductivity and also has certain flexibility, wear resistance and corrosion resistance, ensuring smooth transmission of the test current between the lightning arrester and the high-voltage generator. In addition, the test lead can be flexibly arranged and connected in a limited space (such as inside the box transformer), and the wear resistance and corrosion resistance of the conductive cloth or the conductive lead also improve the service life thereof, ensuring the safety in use.
[0016] In some possible implementation manners, the insulating tube is at least one of a glass fiber reinforced plastic member and an epoxy resin member.
[0017] The glass fiber reinforced plastic member and the epoxy resin member both have certain insulation performance and mechanical strength, which can not only provide certain electrical isolation and protection, but also have good mechanical properties and chemical stability, ensuring the safety and durability of the test device.
[0018] In some possible implementation manners, the leakage current test auxiliary device further comprises a lifting appliance connected with the insulating tube, the lifting appliance being used to lift the insulating tube to a suspended state.
[0019] By suspending the insulating tube, contact or collision between the insulating tube and other components in the box transformer can be avoided, thereby ensuring the accuracy and safety of the test results.
[0020] In some possible implementation manners, the lifting appliance is an insulating belt, the length of the insulating belt is greater than the length of the insulating tube, and the two ends of the lifting appliance are connected with the insulating tube respectively.
[0021] When the insulating tube is connected, the two ends of the insulating belt can be fixed at different positions of the insulating tube respectively, thereby providing a certain adjustment space, so that the insulating tube can more easily reach the required suspended height and position, improving the accuracy and convenience of the test.
[0022] In some possible implementation manners, the leakage current test auxiliary device further comprises an insulating sleeve, the insulating sleeve is sleeved outside the insulating tube, and the lifting appliance is connected with the insulating sleeve.
[0023] The insulating sleeve is arranged to provide additional insulation protection for the insulating tube, and also enables the lifting appliance to be directly connected with the insulating sleeve, thereby simplifying the connection structure and improving the stability of the connection.
[0024] In some possible implementation manners, the insulating sleeve is a rubber piece.
[0025] By arranging the rubber piece as the insulating sleeve, the insulating sleeve protects the electrical safety of the insulating tube and the test lead inside the insulating tube. In addition, the rubber material has elasticity, and in the test process, the insulating tube may be slightly deformed due to temperature change or mechanical stress. The rubber insulating sleeve can absorb these changes through elastic deformation to maintain the stability and safety of the insulating tube.
[0026] The application also provides a leakage current test system for a lightning arrester in a box-type transformer substation, comprising a high-voltage generator and the leakage current test auxiliary device for a lightning arrester in a box-type transformer substation in the possible implementation manners.
[0027] The leakage current test auxiliary device and the test system for a lightning arrester in a box-type transformer substation provided by the application can realize leakage current test without disassembling the lightning arrester, shorten the maintenance time, improve the maintenance efficiency, and the design of the insulating tube and the test lead takes into account the electrical safety factor, avoids the situation that the high-voltage lead is discharged due to insufficient safety distance caused by the narrow space in the box-type transformer substation, prevents the occurrence of leakage current or electric shock accidents, and improves the maintenance safety. BRIEF DESCRIPTION OF DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.
[0029] Figure 1 FIG. 1 is a structural schematic diagram of a leakage current test auxiliary device for a lightning arrester in a box-type transformer substation according to an embodiment of the application;
[0030] Figure 2 FIG. 1 is a structural schematic diagram of a leakage current test auxiliary device for a lightning arrester in a box-type transformer substation according to an embodiment of the application;
[0031] Explanation of reference signs:
[0032] 10 - box transformer; 20 - arrester; 30 - high voltage generator;
[0033] 100 - insulating tube;
[0034] 200 - test lead; 210 - first end; 220 - second end;
[0035] 300 - sling;
[0036] 400 - insulating sleeve. DETAILED DESCRIPTION
[0037] In order to make the above objectives, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0038] The box transformer is used to realize switching operation and control in the process of electric energy conversion and distribution, so as to distribute electric energy to the power distribution network, and is one of indispensable devices in the power system. In order to ensure the electrical safety of the box transformer, an arrester is usually arranged in the box transformer, and the optional arrester can be a zinc oxide arrester.
[0039] The arrester needs to be regularly inspected and maintained. Considering that the space in the box transformer is narrow and inconvenient for personnel operation, and in order to ensure that the live circuit has sufficient safety distance during the test process, the arrester needs to be disassembled from the box transformer and concentrated in a safe area.
[0040] Taking a 150MW wind farm as an example, if there are 60 35kV transformers on site, there are 180 35kV arresters. In order to ensure that the live circuit has sufficient safety distance during the test process, the arrester needs to be disassembled from the box transformer during the maintenance pre-test process, and concentrated in a safe area for testing. The space in the box transformer is narrow and only one person can operate, and it takes about 25 minutes to disassemble and install 3 arresters in one box transformer. It takes 1500 minutes to disassemble and install the arresters in 60 box transformers.
[0041] During the centralized maintenance period, such as a new energy station, the equipment to be maintained needs to be powered off for inspection and maintenance, and as described in the above example, due to the large number of maintenance equipment and short maintenance period, the use of conventional maintenance methods is time-consuming and laborious, the labor cost is large, and the maintenance efficiency is low.
[0042] Therefore, the application provides a leakage current test auxiliary device for a lightning arrester in a box transformer, which can realize leakage current test without disassembling the lightning arrester, shorten the maintenance time, improve the maintenance efficiency, and improve the maintenance safety by considering the electrical safety factor in the design of the insulation tube and the test lead.
[0043] The leakage current test auxiliary device for a lightning arrester in a box transformer according to the first aspect of the application will be described below in combination with Figure 1 and Figure 2 The leakage current test auxiliary device for a lightning arrester in a box transformer according to the first aspect of the application will be described below in combination with
[0044] Reference Figure 1 and Figure 2 , the leakage current test auxiliary device for a lightning arrester in a box transformer according to the first aspect of the application, which is used to connect the lightning arrester 20 and the high-voltage generator 30, comprises an insulation tube 100 and a test lead 200. The insulation tube 100 is arranged at a distance from the lightning arrester 20 in the box transformer 10. For example, the insulation tube 100 is made of rubber or other insulating materials. The test lead 200 is fixed to the insulation tube 100, and the two ends of the test lead 200 are connected to the lightning arrester 20 and the high-voltage generator 30, respectively.
[0045] In this way, when performing the leakage current test, the high-voltage generator 30 applies a certain voltage to the lightning arrester 20 through the test lead 200 to simulate the overvoltage in actual operation. The lightning arrester 20 generates a leakage current after being subjected to the voltage, and the current passes through the test lead 200, which is measured and recorded by the high-voltage generator 30.
[0046] The leakage current test auxiliary device can realize leakage current test without disassembling the lightning arrester 20, shorten the maintenance time, improve the maintenance efficiency, and improve the maintenance safety by considering the electrical safety factor in the design of the insulation tube 100 and the test lead 200, avoiding the discharge of the high-voltage lead due to insufficient safety distance caused by the narrow space in the box transformer 10, preventing the occurrence of leakage current or electric shock accidents, and improving the maintenance safety.
[0047] In some embodiments, in combination with Figure 1 and Figure 2 , the insulation tube 100 is sleeved on the outside of the test lead 200. The insulation tube 100 is made of insulating materials and can isolate the test lead 200 from the electrical connection with the surrounding environment (such as the cabinet of the box transformer 10) to prevent current leakage or short circuit. When the insulation tube 100 is sleeved on the outside of the test lead 200, a double-insulated barrier is formed to further improve the electrical safety during the test.
[0048] In some embodiments, in combination with Figure 1 and Figure 2 , the test lead 200 includes a first end 210 connected with the lead of the lightning arrester 20 and a second end 220 connected with the lead of the high-voltage generator 30, both of which extend to the outside of the insulating tube 100. Exemplarily, the first end 210 and the second end 220 can be respectively provided with interfaces or clamps adapted to the lightning arrester 20 lead and the high-voltage generator 30 lead.
[0049] The two ends of the test lead 200 extend to the outside of the insulating tube 100, so that the operator can complete the connection with the lightning arrester 20 and the high-voltage generator 30 without opening or moving the insulating tube 100, improving the convenience and efficiency of operation. In addition, arranging the connection points of the test lead 200 outside the insulating tube 100 can reduce the need for the operator to work inside the box transformer 10, thereby reducing the risk of electric shock and mechanical injury, further improving the safety during the test process.
[0050] In some embodiments, in combination with Figure 1 and Figure 2 , the test lead 200 is a conductive cloth, a conductive lead, etc. The conductive cloth or the conductive lead not only has excellent electrical conductivity, but also has certain flexibility, wear resistance and corrosion resistance, ensuring smooth transmission of the test current between the lightning arrester 20 and the high-voltage generator 30, and in addition, enabling the test lead 200 to be flexibly arranged and connected in a limited space (such as inside the box transformer 10), and the wear resistance and corrosion resistance of the conductive cloth or the conductive lead also improve its own service life, ensuring the safety of use.
[0051] In some embodiments, in combination with Figure 1 and Figure 2 , the insulating tube 100 is at least one of a glass fiber reinforced plastic and an epoxy resin. Both the glass fiber reinforced plastic and the epoxy resin have certain insulation performance and mechanical strength, not only can provide certain electrical isolation and protection, but also have good mechanical properties and chemical stability, ensuring the safety and durability of the test device.
[0052] In actual application, the glass fiber reinforced plastic or the epoxy resin can be selected as the material of the insulating tube 100 according to specific needs and conditions. Exemplarily, if the test device needs to withstand greater external force and pressure, or needs to be used in harsh environments, the glass fiber reinforced plastic can be selected; if the test device has certain requirements for insulation performance and heat resistance, the epoxy resin can be selected; in addition, both can also be used in combination.
[0053] In some embodiments, in combination with Figure 1 and Figure 2The leakage current test auxiliary device further comprises a lifting tool 300 connected with the insulating tube 100, and the lifting tool 300 is used to lift the insulating tube 100 to a suspended state, so as to facilitate the leakage current test of the lightning arrester 20. By suspending the insulating tube 100, contact or collision between the insulating tube 100 and other components in the box transformer 10 can be avoided, thereby ensuring the accuracy and safety of the test results.
[0054] In some embodiments, in combination with Figure 1 and Figure 2 , the lifting tool 300 is an insulating belt, which ensures electrical isolation between the lifting tool 300 and the surrounding environment, prevents current leakage or disconnection, and has a length greater than that of the insulating tube 100. The two ends of the lifting tool 300 are connected with the insulating tube 100 respectively. In this way, when the insulating tube 100 is connected, the two ends of the insulating belt can be fixed at different positions of the insulating tube 100 respectively, thereby providing a certain adjustment space, so that the insulating tube 100 can more easily reach the required suspended height and position, improving the accuracy and convenience of the test.
[0055] In some embodiments, in combination with Figure 1 and Figure 2 , the leakage current test auxiliary device further comprises an insulating sleeve 400 sleeved on the outside of the insulating tube 100, and the lifting tool 300 is connected with the insulating sleeve 400. The provision of the insulating sleeve 400 provides additional insulation protection for the insulating tube 100, and also enables the lifting tool 300 to be directly connected with the insulating sleeve 400, simplifying the connection structure and improving the stability of the connection.
[0056] In some embodiments, in combination with Figure 1 and Figure 2 , the insulating sleeve 400 is a rubber piece. By setting the rubber piece as the insulating sleeve 400, the insulating sleeve 400 protects the electrical safety of the insulating tube 100 and the internal test lead 200. In addition, the rubber material has a certain elasticity, and during the test, the insulating tube 100 may be slightly deformed due to temperature changes or mechanical stress. The rubber insulating sleeve 400 can absorb these changes through its elastic deformation, maintaining the stability and safety of the insulating tube 100.
[0057] In addition, the second aspect embodiment of the present application further provides a leakage current test system for a lightning arrester in a box transformer, which comprises a high-voltage generator 30 and the leakage current test auxiliary device for a lightning arrester in a box transformer in any of the above embodiments.
[0058] The leakage current test auxiliary device of the box transformer internal lightning arrester provided by the embodiment of the application, before the leakage current test, first needs to place the high-voltage generator 30, connect the end of the high-voltage generator 30 with one end of the test lead 200, and connect the other end of the test lead 200 with the lead of the lightning arrester 20, start the high-voltage generator 30, and adjust the output voltage and current parameters according to the test requirements, the high-voltage signal will be transmitted to the lightning arrester 20 through the test lead 200, simulate the voltage environment in actual work, the leakage current test auxiliary device will monitor the leakage current of the lightning arrester 20 in real time, and feed back the related data to the test personnel, the test personnel judge whether the performance of the lightning arrester 20 meets the requirements according to the data, and make corresponding processing or maintenance decision.
[0059] By setting the leakage current test auxiliary device of the box transformer internal lightning arrester in the leakage current test system, the leakage current test can be performed without disassembling the lightning arrester 20, the discharge of the high-voltage lead caused by the insufficient safety distance due to the small space in the box transformer 10 is avoided, the occurrence of leakage current or electric shock accident is prevented, and the maintenance efficiency and safety are improved.
[0060] The embodiments or implementations in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.
[0061] It should be noted that the embodiments mentioned in the specification, such as "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like, can include specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in combination with other embodiments described explicitly or implicitly.
[0062] Generally, the terms should be understood at least partly by the use in the context. For example, at least partly according to the context, the term "one or more" used in the text can be used to describe any feature, structure or characteristic of singular meaning, or can be used to describe the combination of features, structures or characteristics of plural meaning. Similarly, at least partly according to the context, the terms such as "a" or "said" can be understood as conveying singular usage or conveying plural usage.
[0063] It should be readily understood that "on," "over," and "above" in the present disclosure should be interpreted in the broadest manner such that "on" means not only "directly on" but also includes the meaning of "on" with intervening features or layers therebetween, and "over" or "above" includes not only the meaning of "over" or "above" but also the meaning of "over" or "above" with no intervening features or layers therebetween (i.e., directly on).
[0064] Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present application, but not to limit the same; even though the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions recorded in the foregoing embodiments, or equivalent replacements can be made to some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A leakage current test auxiliary device for a surge arrester in a box transformer, characterized by, The leakage current test auxiliary device is used for connecting the lightning arrester (20) and the high-voltage generator (30), and comprises: An insulating tube (100) is arranged at intervals with the lightning arrester (20) in the box transformer (10); A test lead (200) is fixed to the insulating tube (100), and two ends of the test lead (200) are respectively connected with the lightning arrester (20) and the high-voltage generator (30).
2. The leakage current test auxiliary device for the surge arrester in the box transformer according to claim 1, characterized in that, The insulating tube (100) is sleeved on the outside of the test lead (200).
3. The auxiliary device for leakage current test of the surge arrester in the box transformer according to claim 2, characterized in that, The test lead (200) comprises a first end (210) connected with a lead of the lightning arrester (20) and a second end (220) connected with a lead of the high-voltage generator (30), The first end (210) and the second end (220) both extend to the outside of the insulating tube (100).
4. The auxiliary device for leakage current test of the surge arrester in the box transformer according to claim 1, characterized in that, The test lead (200) is a conductive cloth.
5. The auxiliary device for leakage current test of the surge arrester in the box transformer according to claim 1, characterized in that, The insulating tube (100) is at least one of a glass fiber reinforced plastic and an epoxy resin.
6. The auxiliary device for leakage current test of the surge arrester in the box transformer according to claim 1, characterized in that, Further comprising: A lifting tool (300) is connected with the insulating tube (100), and the lifting tool (300) is used for lifting the insulating tube (100) to a suspended state.
7. The auxiliary device for leakage current test of the surge arrester in the box transformer according to claim 6, characterized in that, The lifting tool (300) is an insulating belt, the length of the insulating belt is greater than the length of the insulating tube (100), and two ends of the lifting tool (300) are respectively connected with the insulating tube (100).
8. The auxiliary device for leakage current test of the surge arrester in the box transformer according to claim 6, characterized in that, Further comprising: An insulating sleeve (400) is sleeved on the outside of the insulating tube (100), and the lifting tool (300) is connected with the insulating sleeve (400).
9. The auxiliary device for leakage current test of the surge arrester in the box transformer according to claim 8, characterized in that, The insulating sleeve (400) is a rubber piece.
10. A leakage current test system for a surge arrester in a box transformer, characterized by, Comprise: The high-voltage generator (30) and the leakage current test auxiliary device of the lightning arrester in the box transformer according to any one of claims 1-9.