Extension gasket for T-connection bus bar and cable head

Abstract

The invention relates to an extension gasket for a T-connection bus bar and a cable head, which comprises a connection terminal basic module and a double-thread copper core column, and is characterized in that the connection terminal basic module is in threaded connection with the double-thread copper core column through a connection bolt; the connection terminal further comprises a temperature sensing module integrated on the surface of the connection terminal basic module, the temperature sensing module comprises an infrared sensor and a signal transmission interface, the infrared sensor is aligned with a heating area of a cable joint, the signal transmission interface is connected to a secondary monitoring panel of the box-type transformer, cable breakpoints can be directly connected, and the temperature sensing module is integrated on the surface of the connection terminal basic module. And the operation temperature is continuously detected after splicing.

Description

Technical Field

[0001] The present invention relates to an extension gasket for a T-connected busbar and a cable head, belonging to the technical field of broken wire connection. Background Art

[0002] With the improvement of residents' living standards and the increase in power consumption load, when a cable is burned out due to short circuit or poor contact, it is time-consuming and laborious to directly replace it during emergency repair. Developing an interval cable T-connection extension gasket can effectively solve the problem of remaking the entire three-phase cable terminal joint due to a missing section caused by burning. During the inspection of ring main units and distribution substations in the power system, the work of T-connected cables will be encountered, and this kind of work requires a high degree of precision. Once the cable length measurement is inaccurate, it will be time-consuming and laborious, and there is also a risk of damaging the cold shrinkable sleeve, prolonging the construction time, and such delays in power transmission due to such reasons are not uncommon. In view of these problems encountered in production operation and maintenance, the present invention is committed to researching an extension gasket for a T-connected busbar and a cable head, which can replace the problem of remaking the three-phase cable terminal due to insufficient length of a certain phase cable during emergency repair and out-of-phase sequence adjustment, saving time and effort, improving the operation stability and power supply reliability of the high-voltage medium-voltage switchgear in the switchyard, and at the same time being able to detect the cable temperature to avoid secondary burning. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides an extension gasket for a T-connected busbar and a cable head, which can directly connect the cable break point and continuously detect the operating temperature after connection.

[0004] The technical solution of the present invention is as follows:

[0005] An extension gasket for a T-connected busbar and a cable head includes a connection terminal basic module and a double-headed threaded copper core column. The connection terminal basic module is threadedly connected to the double-headed threaded copper core column through a connection bolt; it also includes a temperature sensing module integrated on the surface of the connection terminal basic module. The temperature sensing module includes an infrared sensor and a signal transmission interface. The infrared sensor is aligned with the heat-generating area of the cable joint, and the signal transmission interface is connected to the secondary monitoring panel of the box-type transformer.

[0006] Among them, the temperature sensing module calculates the corrected infrared temperature value based on the field of view area correction model: Where ΔT is the temperature rise difference of the cable joint, S DLT is the area of the cable joint, S MeasuredField is the field of view coverage area of the infrared thermometer; through the corrected T i红外 The temperature rise is monitored in real time, and when ΔT≥10°C, an alarm is triggered to dynamically shorten the allowable operation time of the equipment.

[0007] Among them, the calculation formula for the field of view coverage area is: Where θ is the field of view angle of the infrared sensor, d is 20m; S DLT = 2rl, where r is the radius of the effective heat generation area of the cable joint, and l is the effective length in the detection direction.

[0008] Among them, the outer diameter of the contact surface of the connection terminal basic module is 40mm, the inner diameter is 8mm, the material is copper busbar, and the maximum telescopic length of the double-headed threaded copper core column is 9.2cm.

[0009] Among them, the double-headed threaded copper core column and the connection terminal basic module adopt a 360-degree rotation connection structure and are fixed by connection bolts to achieve multi-angle adjustment of the cable joint.

[0010] Among them, the temperature warning mechanism dynamically shortens the allowable operation time of the equipment according to the corrected T i红外 When T i红外 rises by 10°C each time, the operation duration is shortened by 2 hours; until the temperature drops below 80°C, the normal operation is restored.

[0011] Among them, the cross-sectional area A of the connection terminal basic module satisfies A≥420mm 2 , meeting the current-carrying capacity requirements, where k takes values from 1.0 to 1.5.

[0012] Among them, the axial tensile stress of the double-headed threaded copper core column satisfies where F is the gravity of the tool hanging, and A is the cross-sectional area of the copper core column, which is used to support the function of hanging high-altitude operation tools.

[0013] Among them, the temperature sensing module further includes compensating for the influence of the ambient temperature by the box transformer temperature difference coefficient A, and the specific formula is: where A approaches 0, T env is the ambient temperature.

[0014] Among them, the contact surface between the connection terminal basic module and the double-headed threaded copper core column is provided with anti-slip lines.

[0015] The present invention has the following beneficial effects:

[0016] Through the 360-degree rotation connection structure between the connection terminal basic module and the double-headed threaded copper core column of the present invention, combined with the adjustable connection bolt fixing method, the multi-angle flexible adjustment of the cable joint is realized, significantly improving the installation adaptability of the T-connection busbar and the cable head; by integrating the temperature sensing module and using the field of view area correction model for temperature compensation calculation, combined with the infrared sensor focusing on the heat generation area and the signal transmission interface to transmit data in real time, the accurate monitoring and over-temperature warning of the cable joint temperature are realized, effectively preventing secondary burnout accidents. Description of the Drawings

[0017] Figure 1 This is the front view of the extension gasket of the present invention;

[0018] Figure 2 This is the side view of the extension gasket of the present invention;

[0019] Figure 3 This is the front view of the connection terminal base module of the present invention;

[0020] Figure 4 This is the left view of the connection terminal base module of the present invention.

[0021] The reference numerals in the figure are shown as:

[0022] 1. Connection terminal base module; 2. Double-headed threaded copper core column; 3. Connection bolt. Detailed implementation manners

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please refer to Figures 1 to 4 , the invention provides a technical solution:

[0025] An extension gasket for T-shaped busbar and cable head, comprising a connection terminal base module 1 and a double-headed threaded copper core column 2, wherein the connection terminal base module 1 is threadedly connected to the double-headed threaded copper core column 2 through a connection bolt 3; it further includes a temperature sensing module integrated on the surface of the connection terminal base module 1, and the temperature sensing module includes an infrared sensor and a signal transmission interface. The infrared sensor is aligned with the heat generating area of the cable joint, and the signal transmission interface is connected to the secondary monitoring panel of the box-type transformer; the outer diameter of the contact surface of the connection terminal base module 1 is 40 mm, the inner diameter is 8 mm, the material is copper busbar, and the maximum telescopic length of the double-headed threaded copper core column 2 is 9.2 cm;

[0026] Specifically, during installation, first align the connection terminal base module 1 with the corresponding interface of the T-shaped busbar, adjust its telescopic length (maximum 9.2 cm) by rotating the double-headed threaded copper core column 2 to make it closely dock with the cable head, and then fix it with the connection bolt 3. The infrared sensor of the temperature sensing module needs to be pre-calibrated to ensure that the center of its field of view is aligned with the effective heat generating area of the cable joint (such as the crimping point or contact surface), and upload the real-time temperature data to the secondary monitoring panel through the signal transmission interface; the temperature sensing module realizes non-contact monitoring of the cable joint, eliminates the need for additional wiring, simplifies the installation process, and supports remote monitoring, improving the operation and maintenance response speed.

[0027] The temperature sensing module calculates the corrected infrared temperature value based on the field of view area correction model: Where ΔT is the temperature increase difference of the cable joint, S DLTis the area of the cable joint, S MeasuredField is the field of view coverage area of the infrared thermometer; through the field of view area correction model, the temperature measurement error caused by the too large field of view coverage range of the infrared sensor is effectively eliminated, and the positioning accuracy of the high temperature point is improved; through the corrected T i红外 The temperature rise is monitored in real time. When ΔT≥10°C, an alarm is triggered, and the allowable operating time of the equipment is dynamically shortened; the maintenance personnel need to pre-enter the geometric parameters of the cable joint (such as radius r and length l), and the system automatically calculates S according to the formula DLT and S MeasuredField , and dynamically corrects the infrared temperature measurement value. When it is monitored that ΔT≥10°C, the system automatically pushes an alarm signal and starts the load reduction program.

[0028] The temperature warning mechanism dynamically shortens the allowable operating time of the equipment according to the corrected T i红外 When T i红外 rises by 10°C each time, the operating duration is shortened by 2 hours; until the temperature drops below 80°C, the normal operation is restored.

[0029] ΔT is the temperature rise difference of the cable joint, that is, ΔT = T 最终温度 -T 初始温度 , considering that the temperature of copper will rise during equipment operation, the resistance will also change accordingly, and its heat generation situation will also change. After testing, it is found that. T 初始温度 When taking 80°C, ΔT is equal to 0, and the equipment can run for a long time almost. After that, the operating duration is shortened by two hours for every 10°C increase. Substituting it, the following data can be obtained:

[0030] <![CDATA[T i红外 > 80 90 100 110 ··· 190 ΔT 0 10 20 30 ··· 110 Running duration (h) ∞ 22 20 18 ··· 2

[0031] Since then, after the device realizes the operating duration when the gasket reaches the corresponding temperature, the box-type substation will send out an alarm through the secondary monitoring panel to prompt the maintenance personnel to eliminate the defects in time.

[0032] The calculation formula for the field of view coverage area is: where θ is the field of view angle of the infrared sensor, d is 20m; S DLT = 2rl, r is the radius of the effective heat generation area of the cable joint, l is the effective length in the detection direction. Before installation, the field of view coverage area needs to be calculated according to the field of view angle θ of the infrared sensor and the preset measurement distance d = 20m; at the same time, the effective heat generation area is determined through the size of the cable joint.

[0033] The double-headed threaded copper core column 2 and the connection terminal base module 1 adopt a 360-degree rotary connection structure and are fixed by the connection bolt 3 to realize multi-angle adjustment of the cable joint; when the cable is out of phase or the space is limited, the connection bolt 3 can be loosened, the double-headed threaded copper core column 2 can be rotated to the target angle, and then the bolt can be re-tightened to fix the angle.

[0034] The cross-sectional area A of the connection terminal base module 1 is ≥ 420 mm 2 , meeting the current-carrying capacity requirements, where k ranges from 1.0 to 1.5.

[0035] The axial tensile stress of the double-headed threaded copper core column 2 meets where F is the gravity of the tool hanging, and A is the cross-sectional area of the copper core column, which is used to support the function of hanging high-altitude operation tools.

[0036] As a preference, the temperature sensing module further includes compensating for the influence of the ambient temperature by the box transformer temperature difference coefficient A, and the specific formula is: where A approaches 0, T env is the ambient temperature; in high or low temperature environments, the system automatically collects the ambient temperature T env , corrects the infrared measurement value through the coefficient A, suppresses the interference of ambient thermal radiation, and makes T i红外 closer to the true temperature of the joint, avoiding false alarms caused by false high readings such as in high summer temperatures.

[0037] The contact surface between the connection terminal base module 1 and the double-headed threaded copper core column 2 is provided with anti-slip lines.

[0038] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An extended gasket for T-connected busbar and cable head, characterized in that: The invention comprises a connection terminal basic module (1) and a double-threaded copper core column (2), wherein the connection terminal basic module (1) is threadedly connected to the double-threaded copper core column (2) via a connection bolt (3); and further comprises a temperature sensing module integrated on the surface of the connection terminal basic module (1), wherein the temperature sensing module comprises an infrared sensor and a signal transmission interface, wherein the infrared sensor is aligned with a heating area of ​​a cable connector, and the signal transmission interface is connected to a secondary monitoring panel of a box-type transformer.

2. The extended gasket for the T-connection busbar and the cable head according to claim 1, wherein: The temperature sensing module calculates the corrected infrared temperature value based on the field of view area correction model: where ΔT is the temperature increase difference of the cable joint, and S DLT is the area of the cable joint, and S MeasuredField is the field of view coverage area of the infrared thermometer; the temperature rise is monitored in real time by the corrected T i红外 When ΔT ≥ 10°C, an alarm is triggered, and the allowable operating time of the equipment is dynamically shortened.

3. The extended gasket for the T-joint busbar and the cable head according to claim 2, characterized in that: The calculation formula for the field of view coverage area is as follows: where θ is the field of view angle of the infrared sensor, d is 20 m; S DLT = 2rl, r is the radius of the effective heat generation area of the cable joint, and l is the effective length in the detection direction.

4. The extended gasket for the T-connection busbar and the cable head according to claim 1, wherein: The contact surface of the connecting terminal basic module (1) has an outer diameter of 40 mm and an inner diameter of 8 mm, is made of a copper busbar, and the maximum telescopic length of the double-threaded copper core column (2) is 9.2 cm.

5. The extended gasket for the T-connection busbar and the cable head according to claim 1, characterized in that: The double-threaded copper core column (2) and the connection terminal base module (1) adopt a 360-degree rotating connection structure and are fixed by connecting bolts (3) to achieve multi-angle adjustment of the cable connector.

6. The extended gasket for the T-connection busbar and the cable head according to claim 2, characterized in that: The temperature warning mechanism dynamically shortens the allowable operation time of the device according to the calibrated T i红外 When T i红外 rises by 10 °C each time, the operation duration is shortened by 2 hours; until the temperature drops below 80 °C and returns to normal operation.

7. The extended gasket for the T-connection busbar and cable head according to claim 1, characterized in that: The cross-sectional area A of the connection terminal base module (1) is ≥ 420 mm 2 , meeting the current-carrying capacity requirements, where k ranges from 1.0 to 1.

5.

8. The extended gasket for the T-joint busbar and cable head according to claim 1, wherein: The axial tensile stress of the double-headed threaded copper core column (2) satisfies where F is the gravity of the tool hanging, and A is the cross-sectional area of the copper core column, which is used to support the tool hanging function for high-altitude operations.

9. The extended gasket for the T-connection busbar and the cable head according to claim 1, wherein: The temperature sensing module further includes compensating for the influence of the ambient temperature by the box transformer temperature difference coefficient A, and the specific formula is where A approaches 0, T env is the ambient temperature.

10. A spreading gasket for a T-connected busbar and a cable head according to claim 1, characterized in that: The contact surface between the connecting terminal basic module (1) and the double-threaded copper core column (2) is provided with anti-slip patterns.

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