Online monitoring system for clamping force, depth and temperature of contact of power equipment

Abstract

The invention discloses an on-line monitoring system for the clamping force, depth and temperature of a contact of power equipment, and relates to the technical field of high-voltage transmission lines, the on-line monitoring system comprises a moving contact arm and a tulip contact, the tulip contact is clamped with the moving contact arm, and the tulip contact comprises an annular grid, a contact piece and an annular spring; the movable contact arm comprises an annular mounting seat, and the inner side of the mounting seat is fixedly connected with the movable contact arm; the movable contact arm further comprises a flexible pressure sensor, the flexible pressure sensor is fixedly connected to the outer side of the contact piece, and the flexible pressure sensor is arranged between the contact piece and the annular spring; the clamping force monitoring device effectively solves the problems that in the prior art, a pressure sensor is arranged at a contact piece gap, so that the clamping force monitored by the pressure sensor is smaller than the actual contact piece stress, and the monitoring result error is large, the pressure sensor can accurately monitor the clamping force of the annular spring, and the clamping force monitoring accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage transmission line technology, and in particular to an online monitoring system for the clamping force, depth and temperature of power equipment contacts. Background Technology

[0002] With social development, people's demand for electricity is increasing day by day. The load-carrying capacity of high-voltage transmission lines mainly depends on the rated operating current of the switchgear and cables. However, in reality, since most high-voltage switchgear uses trolley or center-mounted circuit breakers, overheating often occurs at the moving and stationary contacts between the circuit breaker and the switchgear, affecting the load-carrying capacity of the line and, in severe cases, may even lead to accidents such as switchgear burnout.

[0003] Current switchgear maintenance and repair measures emphasize careful inspection of the contact fingers and springs, promptly replacing any contact fingers showing burn marks or fastening springs showing deformation or damage. However, accurate measurement of contact spring aging and clamping force is not feasible. Under current conditions, regularly testing the cabinet surface temperature of each switchgear using an infrared thermometer and comparing it with similar switchgear under the same load is neither timely nor efficient.

[0004] Chinese invention patent CN111346867B discloses a dynamic monitoring device for temperature measurement and clamping force of contacts in high-voltage switchgear. It monitors the clamping force of the ring spring on the inner side by embedding a pressure sensor into a positioning post located in the gap between the contacts of the plum blossom contact.

[0005] However, in actual use, the ring spring will deform locally when it encounters resistance at the point of pressing the contact piece. This causes the clamping force of the ring spring at the point of clamping the contact piece to be greater than that at the gap. Consequently, the clamping force monitored by the pressure sensor in the above scheme is less than the actual force on the contact piece, resulting in a large error in the monitoring results. Summary of the Invention

[0006] This application provides an online monitoring system for the clamping force, depth, and temperature of power equipment contacts. This system solves the problem in the prior art where the clamping force detected by the pressure sensor is less than the actual force on the contact piece, resulting in a large error in the monitoring results. It enables the pressure sensor to accurately monitor the clamping force of the ring spring, thereby improving the accuracy of the monitoring.

[0007] This application provides an online monitoring system for the clamping force, depth and temperature of power equipment contacts, including a moving contact arm and a pentagonal contact, wherein the pentagonal contact is engaged with the moving contact arm, and the pentagonal contact includes an annular grid, a contact piece and an annular spring; The movable contact arm includes a mounting base, which is annular. The inner side of the mounting base is fixedly connected to the movable contact arm, and a connecting rod is fixedly connected to the outer side of the mounting base. The connecting rod is rod-shaped and evenly distributed around the circumference of the mounting base. A mounting frame is fixedly connected to the top of the connecting rod, and a data acquisition device is fixedly connected to the mounting frame. The movable contact arm also includes a flexible pressure sensor, which is fixedly connected to the outside of the contact piece and is located between the contact piece and the annular spring.

[0008] More preferably, the movable contact arm further includes a temperature sensor, which is disposed between the mounting bracket and the contact piece, and the temperature sensor is fixedly connected to the mounting bracket.

[0009] Further preferably, the flexible pressure sensor further includes an upper flexible layer, an upper electrode layer, a pressure-sensitive layer, a lower electrode layer, and a lower flexible layer. The upper flexible layer is disposed on the outermost layer of the flexible pressure sensor and is used to contact the annular spring. The upper electrode layer is disposed on the inner side of the upper flexible layer. The pressure-sensitive layer is disposed on the inner side of the upper electrode layer. The lower electrode layer is disposed on the inner side of the pressure-sensitive layer. The lower flexible layer is disposed on the inner side of the lower electrode layer. The lower electrode layer is fixedly connected to the contact piece.

[0010] More preferably, the upper flexible layer and the lower flexible layer are made of high-temperature resistant polyester film, and the upper flexible layer and the lower flexible layer are used for insulation and heat insulation to ensure the sensitivity of the pressure-sensitive layer.

[0011] More preferably, the flexible pressure sensor further includes an upper electrode lead and a lower electrode lead, one end of the upper electrode lead being fixedly connected to the upper electrode layer, and one end of the lower electrode lead being fixedly connected to the lower electrode layer.

[0012] More preferably, the upper electrode lead wire is a silver wire core with an outer polyester film protective sleeve, and the lower electrode lead wire is a silver wire core with an outer polyester film protective sleeve.

[0013] More preferably, the number of contact pieces is the same as the number of connecting rods, and there are twelve connecting rods. The connecting rods and contact pieces are arranged alternately, and a signal amplification module is fixedly connected to each connecting rod. The signal amplification module is electrically connected to the upper electrode lead and the lower electrode lead.

[0014] More preferably, the connecting rod includes a transmitting rod and a receiving rod, the number of transmitting rods and receiving rods are the same, the transmitting rods and receiving rods are arranged opposite to each other, the transmitting rod is fixedly connected to a laser emitting lamp, the receiving rod is fixedly connected to a laser travel sensor, the laser emitting lamp and the laser travel sensor are matched, and the laser travel sensor is used to detect the insertion depth of the plum blossom contact.

[0015] More preferably, the data acquisition device includes a signal conversion module and a wireless transmission module. The signal conversion module is electrically connected to a signal amplification module, a temperature sensor, and a laser travel sensor. The signal conversion module is also electrically connected to the wireless transmission module, which transmits digital signals to the cloud via a 4G or 5G network.

[0016] More preferably, the number of data collectors is the same as the number of contact pieces, and the data collectors are used to monitor the status of each contact piece and send it to the cloud to form a comprehensive digital model.

[0017] One or more technical solutions provided in this application have at least the following technical effects or advantages: Firstly, by fixing a flexible pressure sensor to the outside of the contact piece, and placing the flexible pressure sensor between the contact piece and the ring spring, the problem of placing the pressure sensor at the gap between the contact pieces in the prior art, which causes the clamping force monitored by the pressure sensor to be less than the actual force on the contact piece, resulting in a large error in the monitoring results, is effectively solved. This allows the pressure sensor to accurately monitor the clamping force of the ring spring, improving the accuracy of clamping force monitoring.

[0018] Secondly, by placing the temperature sensor between the mounting bracket and the contact piece, the temperature of the contact piece head can be directly detected, which improves the accuracy of temperature monitoring. Furthermore, by arranging the transmitting rod and receiving rod opposite each other, and matching the laser emitting lamp with the laser travel sensor, the laser travel sensor monitors the length of the laser being blocked, thereby detecting the insertion depth of the plum blossom contact, realizing multi-faceted monitoring of depth, temperature, etc., and improving the comprehensiveness of monitoring data.

[0019] Third, by setting up multiple data acquisition devices, all monitoring data from each contact point is sent to the cloud to build a comprehensive online digital model, which improves the comprehensiveness, accuracy and timeliness of monitoring. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of an online monitoring system for the clamping force, depth, and temperature of power equipment contacts according to the present invention. Figure 2 This is a cross-section of an online monitoring system for the clamping force, depth, and temperature of power equipment contacts according to the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the contact plate structure of an online monitoring system for the clamping force, depth, and temperature of power equipment contacts according to the present invention. Figure 4 This is a cross-sectional view of a flexible pressure sensor in an online monitoring system for the clamping force, depth, and temperature of power equipment contacts according to the present invention. Figure 5 This is a cross-section of an online monitoring system for the clamping force, depth, and temperature of power equipment contacts according to the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the connecting rod of an online monitoring system for the clamping force, depth, and temperature of power equipment contacts according to the present invention. Figure 7 This is a schematic diagram of the data acquisition device of an online monitoring system for the clamping force, depth, and temperature of power equipment contacts according to the present invention.

[0021] In the picture: 100. Moving contact arm; 110. Mounting base; 120. Connecting rod; 1210. Transmitting rod; 1211. Laser emitting lamp; 1220. Receiving rod; 1221. Laser travel sensor; 123. Signal amplification module; 130. Mounting bracket; 140. Data acquisition unit; 141. Signal conversion module; 142. Wireless transmitting module; 150. Flexible pressure sensor; 151. Upper flexible layer; 152. Upper electrode layer; 153. Pressure-sensitive layer; 154. Lower electrode layer; 155. Lower flexible layer; 156. Upper electrode lead wire; 157. Lower electrode lead wire; 160. Temperature sensor; 200, plum blossom contact; 210, annular grid; 220, contact piece; 230, annular spring. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0023] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Example 1: As Figures 1-4As shown, this application discloses an online monitoring system for the clamping force, depth, and temperature of electrical equipment contacts, including a movable contact arm 100 and a plum blossom contact 200. The plum blossom contact 200 is engaged with the movable contact arm 100, and the plum blossom contact 200 includes an annular grid 210, a contact piece 220, and an annular spring 230. The movable contact arm 100 includes a mounting base 110, which is annular. The inner side of the mounting base 110 is fixedly connected to the movable contact arm 100, and a connecting rod 120 is fixedly connected to the outer side of the mounting base 110. The connecting rod 120 is rod-shaped and is evenly distributed around the circumference of the mounting base 110. A mounting frame 130 is fixedly connected to the top of the connecting rod 120, and a data acquisition device 140 is fixedly connected to the mounting frame 130. The movable contact arm 100 also includes a flexible pressure sensor 150, which is fixedly connected to the outside of the contact piece 220 and is located between the contact piece 220 and the annular spring 230.

[0026] More preferably, the movable contact arm 100 further includes a temperature sensor 160, which is disposed between the mounting bracket 130 and the contact piece 220, and is fixedly connected to the mounting bracket 130.

[0027] Further preferably, the flexible pressure sensor 150 further includes an upper flexible layer 151, an upper electrode layer 152, a pressure-sensitive layer 153, a lower electrode layer 154, and a lower flexible layer 155. The upper flexible layer 151 is disposed on the outermost layer of the flexible pressure sensor 150 and is used to contact the annular spring 230. The upper electrode layer 152 is disposed on the inner side of the upper flexible layer 151. The pressure-sensitive layer 153 is disposed on the inner side of the upper electrode layer 152. The lower electrode layer 154 is disposed on the inner side of the pressure-sensitive layer 153. The lower flexible layer 155 is disposed on the inner side of the lower electrode layer 154. The lower electrode layer 154 is fixedly connected to the contact piece 220.

[0028] More preferably, the upper flexible layer 151 and the lower flexible layer 155 are made of high-temperature resistant polyester film, and the upper flexible layer 151 and the lower flexible layer 155 are used for insulation and heat insulation to ensure the sensitivity of the pressure sensitive layer 153.

[0029] More preferably, the flexible pressure sensor 150 further includes an upper electrode lead 156 and a lower electrode lead 157, one end of the upper electrode lead 156 being fixedly connected to the upper electrode layer 152, and one end of the lower electrode lead 157 being fixedly connected to the lower electrode layer 154.

[0030] More preferably, the upper electrode lead 156 has a silver wire core and an outer polyester film protective sleeve, and the lower electrode lead 157 has a silver wire core and an outer polyester film protective sleeve.

[0031] This application also includes a power component and a control unit. The power component is used to supply power for the operation of the testing platform, preferably an AC power supply or a battery. The control unit is used to control the coordinated operation of various components of the testing platform, preferably a programmable logic controller. Both are prior art and will not be described in detail here.

[0032] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: By fixing the flexible pressure sensor 150 to the outside of the contact piece 220, and placing the flexible pressure sensor 150 between the contact piece 220 and the annular spring 230, the problem of placing the pressure sensor at the gap of the contact piece 220 in the prior art, which makes the clamping force monitored by the pressure sensor less than the actual force on the contact piece 220, resulting in a large error in the monitoring result, is effectively solved. This allows the pressure sensor to accurately monitor the clamping force of the annular spring 230, improving the accuracy of clamping force monitoring.

[0033] Example 2: Considering that the contact's depth and temperature will change during use, and these changes directly affect the operational stability and safety of the equipment, this application's example is an optimization based on the above examples.

[0034] like Figures 5-6 As shown, the number of contact pieces 220 is the same as the number of connecting rods 120. There are twelve connecting rods 120. The connecting rods 120 and contact pieces 220 are arranged alternately. A signal amplification module 123 is fixedly connected to each connecting rod 120. The signal amplification module 123 is electrically connected to the upper electrode lead 156 and the lower electrode lead 157.

[0035] More preferably, the connecting rod 120 includes a transmitting rod 1210 and a receiving rod 1220, the number of transmitting rods 1210 and receiving rods 1220 is the same, the transmitting rods 1210 and receiving rods 1220 are arranged opposite to each other, the transmitting rod 1210 is fixedly connected to a laser emitting lamp 1211, and the receiving rod 1220 is fixedly connected to a laser travel sensor 1221, the laser emitting lamp 1211 and the laser travel sensor 1221 are matched, and the laser travel sensor 1221 is used to detect the insertion depth of the plum blossom contact 200.

[0036] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: By placing the temperature sensor 160 between the mounting bracket 130 and the contact piece 220, the temperature of the contact piece 220 head is directly detected, improving the accuracy of temperature monitoring. Furthermore, by arranging the transmitting rod 1210 and the receiving rod 1220 opposite to each other, and by matching the laser emitting lamp 1211 with the laser travel sensing sensor 1221, the laser travel sensing sensor 1221 monitors the length of the laser beam that is blocked, thereby detecting the insertion depth of the plum blossom contact 200. This achieves multi-faceted monitoring of depth, temperature, and other aspects, improving the comprehensiveness of the monitoring data.

[0037] Example 3: Considering that after long-term use, the wear of the ring spring 230 varies, which affects the clamping force of each contact piece 220, and thus affects the resistance, resulting in different heat generation at different locations, local monitoring may fail to detect contact abnormalities in time, creating safety hazards; this application embodiment is based on the above embodiment with certain optimizations.

[0038] like Figure 1 , Figure 7 As shown, the data acquisition unit 140 includes a signal conversion module 141 and a wireless transmission module 142. The signal conversion module 141 is electrically connected to the signal amplification module 123, the temperature sensor 160, and the laser travel sensor 1221. The signal conversion module 141 is also electrically connected to the wireless transmission module 142, which transmits digital signals to the cloud via a 4G or 5G network.

[0039] More preferably, the number of data collectors 140 is the same as the number of contact pieces 220. The data collectors 140 are used to monitor the status of each contact piece 220 and send it to the cloud to form a comprehensive digital model.

[0040] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: By setting up multiple data acquisition devices 140, all monitoring data from each contact piece 220 are sent to the cloud to build an online comprehensive digital model, thereby improving the comprehensiveness, accuracy, and timeliness of monitoring.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online monitoring system for the clamping force, depth, and temperature of contacts in power equipment, characterized in that, It includes a movable contact arm (100) and a plum blossom contact (200), wherein the plum blossom contact (200) is engaged with the movable contact arm (100), and the plum blossom contact (200) includes an annular grid (210), a contact piece (220) and an annular spring (230). The movable contact arm (100) includes a mounting base (110), which is annular. The inner side of the mounting base (110) is fixedly connected to the movable contact arm (100), and a connecting rod (120) is fixedly connected to the outer side of the mounting base (110). The connecting rod (120) is rod-shaped and is evenly distributed around the mounting base (110). A mounting frame (130) is fixedly connected to the top of the connecting rod (120), and a data acquisition device (140) is fixedly connected to the mounting frame (130). The movable contact arm (100) also includes a flexible pressure sensor (150), which is fixedly connected to the outside of the contact piece (220) and is located between the contact piece (220) and the annular spring (230).

2. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 1, characterized in that, The movable contact arm (100) also includes a temperature sensor (160), which is located between the mounting bracket (130) and the contact piece (220), and is fixedly connected to the mounting bracket (130).

3. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 2, characterized in that, The flexible pressure sensor (150) further includes an upper flexible layer (151), an upper electrode layer (152), a pressure-sensitive layer (153), a lower electrode layer (154), and a lower flexible layer (155). The upper flexible layer (151) is disposed on the outermost layer of the flexible pressure sensor (150) and is used to contact the annular spring (230). The upper electrode layer (152) is disposed inside the upper flexible layer (151), the pressure-sensitive layer (153) is disposed inside the upper electrode layer (152), the lower electrode layer (154) is disposed inside the pressure-sensitive layer (153), and the lower flexible layer (155) is disposed inside the lower electrode layer (154). The lower electrode layer (154) is fixedly connected to the contact piece (220).

4. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 3, characterized in that, The upper flexible layer (151) and the lower flexible layer (155) are made of high-temperature resistant polyester film. The upper flexible layer (151) and the lower flexible layer (155) are used for insulation and heat insulation to ensure the sensitivity of the pressure-sensitive layer (153).

5. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 4, characterized in that, The flexible pressure sensor (150) also includes an upper electrode lead (156) and a lower electrode lead (157). One end of the upper electrode lead (156) is fixedly connected to the upper electrode layer (152), and one end of the lower electrode lead (157) is fixedly connected to the lower electrode layer (154).

6. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 5, characterized in that, The upper electrode lead (156) has a silver wire core and an outer layer of polyester film protective sleeve. The lower electrode lead (157) has a silver wire core and an outer layer of polyester film protective sleeve.

7. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 6, characterized in that, The number of contact pieces (220) is the same as the number of connecting rods (120). There are twelve connecting rods (120). The connecting rods (120) and contact pieces (220) are arranged alternately. A signal amplification module (123) is fixedly connected to each connecting rod (120). The signal amplification module (123) is electrically connected to the upper electrode lead (156) and the lower electrode lead (157).

8. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 7, characterized in that, The connecting rod (120) includes a transmitting rod (1210) and a receiving rod (1220). The number of transmitting rods (1210) and receiving rods (1220) is the same. The transmitting rods (1210) and receiving rods (1220) are arranged opposite to each other. A laser emitting lamp (1211) is fixedly connected to the transmitting rod (1210). A laser travel sensor (1221) is fixedly connected to the receiving rod (1220). The laser emitting lamp (1211) and the laser travel sensor (1221) are matched. The laser travel sensor (1221) is used to detect the insertion depth of the plum blossom contact (200).

9. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 8, characterized in that, The data acquisition unit (140) includes a signal conversion module (141) and a wireless transmission module (142). The signal conversion module (141) is electrically connected to the signal amplification module (123), the signal conversion module (141) is electrically connected to the temperature sensor (160), the signal conversion module (141) is electrically connected to the laser travel sensor (1221), and the signal conversion module (141) is electrically connected to the wireless transmission module (142). The wireless transmission module (142) transmits digital signals to the cloud via a 4G or 5G network.

10. The online monitoring system for the clamping force, depth, and temperature of power equipment contacts as described in claim 9, characterized in that, The number of data collectors (140) is the same as the number of contact pieces (220). The data collectors (140) are used to monitor the status of each contact piece (220) and send it to the cloud to form a comprehensive digital model.

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