阅读说明：本技术 配电开关柜电缆终端头肘形结构接触电阻测量系统及方法 (System and method for measuring contact resistance of elbow-shaped structure of cable terminal of distribution switch cabinet ) 是由 罗红涛 刘顺桂 钟士朝 罗致远 尹爱国 包淇天 廖姗珊 覃凯宁 郑亚君 赵启 王 于 2021-07-30 设计创作，主要内容包括：本申请涉及一种配电开关柜电缆终端头肘形结构接触电阻测量系统及方法。该测量系统包括接线装置和电阻测试仪,接线装置触碰电缆终端头压紧垫片且接入电阻测试仪测量回路,电阻测试仪测量回路另一端连接开关柜的接地排,施加合适的电流和电压,测量获取总电阻值,用于肘形结构接触状态判断,实现开关柜的安装工艺评估和缺陷诊断。(The application relates to a contact resistance measurement system and method for an elbow-shaped structure of a cable terminal of a distribution switch cabinet. The measuring system comprises a wiring device and a resistance tester, wherein the wiring device touches a cable terminal compression gasket and is connected into a resistance tester measuring loop, the other end of the resistance tester measuring loop is connected with a grounding bar of the switch cabinet, appropriate current and voltage are applied, and a total resistance value is obtained through measurement and is used for judging the contact state of an elbow structure, so that the installation process assessment and the defect diagnosis of the switch cabinet are realized.)

1. A contact resistance measurement system of an elbow structure of a cable terminal of a distribution switch cabinet is characterized by comprising a wiring device and a resistance tester, wherein the wiring device touches a compression gasket of the cable terminal and is connected into a measurement loop of the resistance tester, and the other end of the measurement loop of the resistance tester is connected with a grounding bar of the switch cabinet to form the contact resistance measurement system of the elbow structure of the cable terminal of the distribution switch cabinet; the contact resistance measurement system of the elbow structure of the cable terminal of the distribution switch cabinet measures the resistance between the switch cabinet grounding bar and the elbow structure of the cable terminal of the switch cabinet to obtain the total resistance value.

2. The system of claim 1, further comprising an upper computer coupled to the resistance tester, the upper computer configured to analyze a contact state of the elbow structure based on the total resistance value.

3. The system of claim 2, wherein the upper computer analyzes the contact status of the elbow structure by performing a lateral comparison on the total resistance value and the total resistance data of the same type of switchgear.

4. The system of claim 2, wherein the upper computer analyzes the contact status of the elbow structure by comparing the total resistance value with a database of historical total resistances.

5. The system of claim 2, wherein the upper computer further calculates the contact resistance of the elbow structure based on the total resistance value and a predetermined resistance constant.

6. The electrical distribution switchgear cable termination elbow structure contact resistance measurement system of claim 2, further comprising a display device connected to the upper computer.

7. The electrical distribution switchgear cable termination elbow structure contact resistance measurement system of claim 2, further comprising a storage device connected to the upper computer.

8. The electrical distribution switchgear cable termination elbow structure contact resistance measurement system of claim 2, further comprising a power supply device connected to the upper computer.

9. A method for measuring contact resistance of an elbow-shaped structure of a cable terminal of a distribution switchgear, which is implemented based on the system for measuring contact resistance of an elbow-shaped structure of a cable terminal of a distribution switchgear according to any one of claims 1 to 8, the method comprising: and a measuring loop of the resistance tester is connected with a grounding bar of the switch cabinet and a cable terminal elbow structure pressing gasket, current and voltage are applied, and the total resistance value is obtained through measurement.

10. The method of measuring contact resistance of an elbow structure of a power distribution switchgear cable termination of claim 9, further comprising: and the upper computer analyzes the contact state of the elbow structure according to the total resistance value.

Technical Field

The application relates to the technical field of power grid equipment detection, in particular to a contact resistance measurement system and method of an elbow-shaped structure of a cable terminal of a distribution switch cabinet.

Background

The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of power generation, power transmission, power distribution and electric energy conversion of an electric power system. The heating defect ratio is higher in the operation process of the switch cabinet, and the important reason is that the contact resistance is increased and abnormal heating is caused due to poor control of the installation process of the elbow-shaped structure of the cable terminal and looseness in the operation.

Because the elbow-shaped structure of the cable terminal end of the switch cabinet is packaged in the insulating sheath, the elbow-shaped structure of the terminal can not be directly measured to analyze the state. How to judge the contact state of the elbow-shaped structure of the cable terminal of the switch cabinet so as to evaluate the installation process of the switch cabinet and diagnose the defects is a problem to be solved urgently.

Disclosure of Invention

In view of the above, there is a need to provide a system and method for measuring contact resistance of elbow-shaped structure of cable terminal of switch cabinet.

A contact resistance measurement system of an elbow structure of a cable terminal of a power distribution switch cabinet comprises a wiring device and a resistance tester, wherein the wiring device touches a compression gasket of the cable terminal and is connected into a measurement loop of the resistance tester, and the other end of the measurement loop of the resistance tester is connected with a grounding bar of the switch cabinet to form the contact resistance measurement system of the elbow structure of the cable terminal of the power distribution switch cabinet; the contact resistance measurement system of the elbow structure of the cable terminal of the distribution switch cabinet measures the resistance between the switch cabinet grounding bar and the elbow structure of the cable terminal of the switch cabinet to obtain the total resistance value.

In one embodiment, the contact resistance measurement system for the elbow structure of the cable terminal of the distribution switchgear further comprises an upper computer connected with the resistance tester, and the upper computer is used for analyzing the contact state of the elbow structure according to the total resistance value.

In one embodiment, the upper computer performs transverse comparison according to the total resistance value and the total resistance data of switch cabinets of the same type, and analyzes the contact state of the elbow structure.

In one embodiment, the upper computer performs longitudinal comparison according to the total resistance value and a preset historical total resistance database, and analyzes the contact state of the elbow structure.

In one embodiment, the upper computer further calculates the contact resistance of the elbow structure according to the total resistance value and a preset resistance constant.

In one embodiment, the contact resistance measurement system with the elbow-shaped structure for the cable terminal of the distribution switchgear further comprises a display device connected with the upper computer.

In one embodiment, the contact resistance measurement system of the elbow-shaped structure of the cable terminal of the distribution switchgear further comprises a storage device connected with the upper computer.

In one embodiment, the contact resistance measurement system with the elbow-shaped structure for the cable terminal of the distribution switchgear further comprises a power supply device connected with the upper computer.

A method for measuring contact resistance of an elbow structure of a cable terminal of a distribution switch cabinet is realized based on the system for measuring contact resistance of the elbow structure of the cable terminal of the distribution switch cabinet, and comprises the following steps: and a measuring loop of the resistance tester is connected with a grounding bar of the switch cabinet and a cable terminal elbow structure pressing gasket, current and voltage are applied, and the total resistance value is obtained through measurement.

In one embodiment, the method further comprises: and the upper computer analyzes the contact state of the elbow structure according to the total resistance value.

According to the contact resistance measurement system and method for the elbow structure of the cable terminal of the power distribution switch cabinet, the resistance tester measurement loop is connected with the grounding bar of the switch cabinet and the cable terminal elbow structure pressing gasket, appropriate current and voltage are applied, the total resistance value is obtained through measurement, the total resistance value is used for judging the contact state of the elbow structure, and the installation process assessment and defect diagnosis of the switch cabinet are realized.

Drawings

FIG. 1 is a schematic diagram of a test connection of a contact resistance measurement system of an elbow-shaped structure of a cable terminal of a distribution switchgear in one embodiment;

FIG. 2 is a diagram of the main wiring of a substation and a switchgear in one embodiment;

fig. 3 is an equivalent circuit diagram of the measurement of the contact resistance of the elbow-shaped structure of the cable terminal of the distribution switchgear in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Unless defined otherwise, 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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that spatial relationship terms, such as "under", "below", "beneath", "below", "over", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.

In one embodiment, the contact resistance measurement system for the elbow-shaped structure of the cable terminal of the distribution switch cabinet is suitable for measuring the contact resistance and judging the contact state of the elbow-shaped structure of the cable terminal under the condition that the 10-20kV switch cabinet is not disassembled, and the installation process evaluation and defect diagnosis of the switch cabinet are realized.

As shown in fig. 1, the measurement system includes a wiring device and a resistance tester, the wiring device touches the cable terminal compression pad and is connected to a resistance tester measurement loop, and the other end of the resistance tester measurement loop is connected to the ground bar of the switch cabinet, so as to form a distribution switch cabinet cable terminal elbow structure contact resistance measurement system, apply appropriate current and voltage, and obtain the total resistance value by measurement.

Further, in one embodiment, the measuring system may further include an upper computer connected to the resistance tester, the upper computer being configured to analyze the contact state of the elbow structure according to the total resistance value, and the upper computer may be a selection computer, a single chip microcomputer, or the like. By measuring resistanceThe test instrument measurement loop is connected with the grounding bar of the switch cabinet and the cable terminal elbow structure pressing gasket, current and voltage are applied, and total resistance R is obtained through measurement_{General assembly}Then, the total resistance R is measured_{General assembly}Sending to an upper computer, and enabling the upper computer to obtain the total resistance R_{General assembly}And the normal switch cabinet total resistance measured value and the fault switch cabinet total resistance measured value stored in the historical database are used for analyzing the contact state of the elbow structure. In addition, the upper computer can also measure the total resistance R_{General assembly}The contact state of the elbow structure is analyzed by a tester through a display device.

In one embodiment, the upper computer calculates the contact resistance of the elbow structure according to the total resistance value and a preset resistance constant. Wherein the resistance constant may include R_{Earth-knife + connecting conductor}And R_{Grounding bar}，R_{General assembly}＝R_{Contact with}+R_{Earth-knife + connecting conductor}+R_{Grounding bar}. The total resistance value R is obtained after measurement_{General assembly}Then, the contact resistance R can be directly calculated by combining a preset resistance constant_{Contact with}. The upper computer can be used for connecting the contact resistor R_{Contact with}The contact resistance R can be sent to a display device for display so as to be conveniently checked by a tester, and the contact resistance R can also be sent to a testing device for display_{Contact with}And the data is sent to a storage device for storage, so that data recording and statistics are convenient.

In one embodiment, the upper computer performs transverse comparison according to the total resistance value and the total resistance data of the switch cabinets of the same type, and analyzes the contact state of the elbow-shaped structure. In particular, if the elbow structure is in good contact, the contact resistance R is usually good_{Contact with}10-20 mu omega; if the contact is poor, the contact resistance R_{Contact with}Will be significantly greater than 20 mu omega. The total resistance value R is under the condition that the resistance constant is not changed_{General assembly}Resistance R along with contact_{Contact with}The upper computer can transversely compare the total resistance values between three phases of the switch cabinet and between switch cabinets of the same model, and judge whether the elbow structures of the cable terminals of the test switch cabinet are in good contact. For example, the three-phase total resistance value calculated by the sample switch cabinet and the difference of the total resistance value with other switch cabinets of the same model are analyzed, if a certain total resistance value is measured in the sample switch cabinetIf the total resistance value is significantly larger than other total resistance values, the elbow structure corresponding to the total resistance value is considered to have poor contact.

In one embodiment, the upper computer performs longitudinal comparison according to the total resistance value and a preset historical total resistance database, and analyzes the contact state of the elbow structure. The historical total resistance database stores the total resistance value of the normal switch cabinet and the total resistance value of the fault switch cabinet. The upper computer longitudinally compares the measured total resistance value with a historical measured value, for example, the similarity between the measured total resistance value and the total resistance of a normal switch cabinet and the similarity between the measured total resistance value and the total resistance of a fault switch cabinet can be analyzed, and if the similarity between the measured total resistance value and the total resistance of the normal switch cabinet is higher, the contact of the elbow structure is good; if the similarity between the measured total resistance value and the total resistance of the fault switch cabinet is higher, the elbow-shaped structure is in poor contact.

In one embodiment, the contact resistance measurement system of the elbow-shaped structure of the cable terminal of the distribution switchgear further comprises a display device connected with an upper computer. The Display device may be an LCD (Liquid Crystal Display) Display screen or an LED (Light Emitting Diode) Display screen, and the upper computer may Display the calculated total resistance R through the Display device_{General assembly}And contact resistance R_{Contact with}For the tester to look at, or by the tester based on the measured total resistance R_{General assembly}The contact state of the elbow structure is analyzed. The upper computer can also be based on the total resistance R_{General assembly}After the contact state of the elbow-shaped structure is analyzed, the analysis result is sent to a display device to be displayed, so that a tester can check the analysis result. Furthermore, the display device can also be a touch display screen, and a tester can also input an instruction through the touch display screen to perform parameter setting or information query.

In one embodiment, the contact resistance measurement system of the elbow-shaped structure of the cable terminal of the distribution switchgear further comprises a storage device connected with an upper computer. The upper computer can calculate the total resistance R_{General assembly}Contact resistance R_{Contact with}And sending the analysis result to a storage device for storage. In addition, the contact resistance measuring system of the elbow-shaped structure of the cable terminal of the distribution switch cabinet can also comprise a connectionThe upper computer can also calculate the total resistance R_{General assembly}Contact resistance R_{Contact with}And the analysis result is transmitted in a wired or wireless mode through the communication device, so that data interaction is facilitated.

In one embodiment, the contact resistance measurement system of the elbow-shaped structure of the cable terminal of the distribution switchgear further comprises a power supply device connected with an upper computer. The power supply device can be used for supplying power to the upper computer by an external power supply. In addition, the contact resistance measurement system with the elbow-shaped structure of the cable terminal of the distribution switch cabinet can also comprise an energy storage element connected with an upper computer, and the energy storage element can be an energy storage capacitor, a rechargeable battery and the like. The host computer can also supply energy through the energy storage element and charge the energy storage element when being connected with an external power supply.

According to the contact resistance measuring system of the elbow-shaped structure of the cable terminal of the distribution switch cabinet, the wiring device touches the cable terminal compression gasket and is connected into the resistance tester measuring loop, the other end of the resistance tester measuring loop is connected with the grounding bar of the switch cabinet, appropriate current and voltage are applied, the total resistance value is obtained through measurement, the contact state of the elbow-shaped structure is judged, and the installation process assessment and defect diagnosis of the switch cabinet are realized.

In an embodiment, a method for measuring contact resistance of an elbow structure of a cable terminal of a distribution switchgear is further provided, which is suitable for measuring contact resistance of the elbow structure of the cable terminal and judging contact state of the elbow structure under the condition that a 10-20kV switchgear is not disassembled, so as to realize switchgear installation process evaluation and defect diagnosis, and the method is realized based on the system for measuring contact resistance of the elbow structure of the cable terminal of the distribution switchgear, and includes: the wiring device touches the cable terminal compression gasket and is connected to the resistance tester measurement loop, and the other end of the resistance tester measurement loop is connected with the grounding bar of the switch cabinet, applies current and voltage, and measures and obtains the total resistance value.

Specifically, the wiring device touches a cable terminal head pressing gasket and is connected into a resistance tester measurement loop, the other end of the resistance tester measurement loop is connected with a grounding bar of the switch cabinet, appropriate current and voltage are applied, and a total resistance value R is obtained through measurement_{General assembly}. Go toStep by step, the resistance tester can also have a total resistance value R_{General assembly}Will be sent to the upper computer according to the total resistance value R_{General assembly}And analyzing the contact state of the elbow-shaped structure. The upper computer can be a selective computer, a singlechip and the like, a grounding bar of the switch cabinet and a cable terminal elbow structure pressing gasket are connected through a resistance tester measuring loop, current and voltage are applied, and total resistance R is obtained through measurement_{General assembly}Then, the upper computer can be used for controlling the total resistance R_{General assembly}And the normal switch cabinet total resistance measured value and the fault switch cabinet total resistance measured value stored in the historical database are used for analyzing the contact state of the elbow structure.

In one embodiment, the upper computer calculates the contact resistance of the elbow structure according to the total resistance value and a preset resistance constant. Wherein the resistance constant may include R_{Earth-knife + connecting conductor}And R_{Grounding bar}，R_{General assembly}＝R_{Contact with}+R_{Earth-knife + connecting conductor}+R_{Grounding bar}. The total resistance value R is obtained after measurement_{General assembly}Then, the contact resistance R can be directly calculated by combining a preset resistance constant_{Contact with}。

In one embodiment, the upper computer performs transverse comparison according to the total resistance value and the total resistance data of the switch cabinets of the same type, and analyzes the contact state of the elbow-shaped structure. In particular, if the elbow structure is in good contact, the contact resistance R is usually good_{Contact with}10-20 mu omega; if the contact is poor, the contact resistance R_{Contact with}Will be significantly greater than 20 mu omega. And the upper computer transversely compares the total resistance values between three phases of the switch cabinet and between switch cabinets of the same model to judge the contact state of the elbow-shaped structure of the cable terminal of the switch cabinet of the test sample. For example, the three-phase total resistance value calculated by the sample switch cabinet and the difference between the total resistance value and the total resistance values of other switch cabinets of the same model are analyzed, and if a certain total resistance value measured in the sample switch cabinet is obviously greater than other total resistance values, the elbow-shaped structure corresponding to the total resistance value is considered to be in poor contact.

In one embodiment, the upper computer performs longitudinal comparison according to the total resistance value and a preset historical total resistance database, and analyzes the contact state of the elbow structure. The historical total resistance database stores the total resistance value of the normal switch cabinet and the total resistance value of the fault switch cabinet. The upper computer longitudinally compares the measured total resistance value with a historical measured value, for example, the similarity between the measured total resistance value and the total resistance of a normal switch cabinet and the similarity between the measured total resistance value and the total resistance of a fault switch cabinet can be analyzed, and if the similarity between the measured total resistance value and the total resistance of the normal switch cabinet is higher, the contact of the elbow structure is good; if the similarity between the measured total resistance value and the total resistance of the fault switch cabinet is higher, the elbow-shaped structure is in poor contact.

In one embodiment, the upper computer displays the calculated total resistance R through the display device_{General assembly}And contact resistance R_{Contact with}For the tester to look at, or by the tester based on the measured total resistance R_{General assembly}The contact state of the elbow structure is analyzed. The upper computer can also be used for controlling the total resistance R_{General assembly}After the contact state of the elbow-shaped structure is analyzed, the analysis result is sent to a display device to be displayed, so that a tester can check the analysis result. Furthermore, the display device can also be a touch display screen, and a tester inputs an instruction through the touch display screen to perform parameter setting or information query.

In one embodiment, the upper computer can calculate the total resistance R_{General assembly}Contact resistance R_{Contact with}And sending the analysis result to a storage device for storage. In addition, the upper computer can also calculate the total resistance R_{General assembly}Contact resistance R_{Contact with}And the analysis result is transmitted in a wired or wireless mode through the communication device, so that data interaction is facilitated.

According to the method for measuring the contact resistance of the elbow-shaped structure of the cable terminal of the distribution switch cabinet, the wiring device touches the cable terminal pressing gasket and is connected into the instrument measuring loop, the other end of the resistance tester measuring loop is connected with the grounding bar of the switch cabinet, appropriate current and voltage are applied, the total resistance value is obtained through measurement, the method is used for judging the contact state of the elbow-shaped structure, and the installation process assessment and defect diagnosis of the switch cabinet are achieved.

In order to better understand the contact resistance measuring system with the elbow-shaped structure of the cable terminal of the distribution switchgear, the following detailed explanation is provided in conjunction with specific embodiments.

As shown in fig. 2, which is a main wiring diagram of a distribution station and a switch cabinet, the heating defect ratio during the operation of the switch cabinet is high, the important reason is that the contact resistance is increased due to poor control of the installation process of the elbow structure of the cable terminal and looseness during operation, and abnormal heating is caused, the contact state can be judged by measuring the contact resistance of the elbow structure of the cable terminal, and the method has important values for the installation process evaluation and the equipment defect diagnosis. Because the elbow-shaped structure of the cable terminal is packaged in the insulating sheath, the measurement cannot be carried out by the traditional method, and the measurement cannot be disassembled once the switch cabinet is installed, molded and put into operation.

Based on the technical scheme, the scheme is suitable for measuring the contact resistance of the elbow-shaped structure of the cable terminal and judging the contact state of the elbow-shaped structure under the condition that the 10-20kV switch cabinet is not disassembled, and the installation process evaluation and defect diagnosis of the switch cabinet are realized.

Specifically, the test wiring is as shown in fig. 1, the contact resistance measurement system of the elbow-shaped structure of the cable terminal of the distribution switch cabinet comprises a wiring device and a resistance tester, the wiring device touches a pressing gasket of the cable terminal and is connected to a measurement loop of the resistance tester, the other end of the measurement loop of the resistance tester is connected with a grounding bar of the switch cabinet, appropriate current and voltage are applied, and the total resistance value is obtained through measurement. Specifically, a resistance tester measurement loop is connected with a grounding bar of a switch cabinet and a cable terminal elbow structure pressing gasket, current and voltage are applied, and total resistance R is obtained through measurement_{General assembly}. FIG. 3 shows an equivalent circuit diagram of the detection of the elbow structure, R_{General assembly}＝R_{Contact with}+R_{Earth-knife + connecting conductor}+R_{Grounding bar}(ii) a With the existing switchgear type and installation specification, R_{Earth-knife + connecting conductor}And R_{Grounding bar}Can be considered as a constant; if the elbow structure makes good contact, R is usually_{Contact with}10-20 mu omega, and R is determined when the contact is poor_{Contact with}Will be significantly greater than 20 mu omega. In summary, reference is made to the measured value of the total resistance of the massive normal switch cabinet and the measured valueThe total resistance measured value of the barrier switch cabinet is compared transversely with the total resistance measured value between three phases of the switch cabinet and between switch cabinets of the same model, and the historical total resistance measured value is compared longitudinally, so that whether the elbow structure of the cable terminal of the test switch cabinet is in good contact or not can be judged.

The contact resistance measurement system of the elbow structure of the cable terminal of the distribution switch cabinet further comprises an upper computer, and the upper computer analyzes the contact state of the elbow structure according to the total resistance value. Specifically, the upper computer carries out transverse comparison according to the total resistance value and the total resistance data of switch cabinets of the same type, and the contact state of the elbow structure is analyzed. And the upper computer also carries out longitudinal comparison according to the total resistance value and a preset historical total resistance database and analyzes the contact state of the elbow structure. Further, the upper computer calculates the contact resistance of the elbow structure according to the total resistance value and a preset resistance constant.

The upper computer carries out transverse comparison according to the total resistance value and the total resistance data of switch cabinets of the same type, and the contact state of the elbow structure is analyzed. For example, the three-phase total resistance value calculated by the sample switch cabinet and the difference between the total resistance value and the total resistance values of other switch cabinets of the same model are analyzed, and if a certain total resistance value measured in the sample switch cabinet is obviously greater than other total resistance values, the elbow-shaped structure corresponding to the total resistance value is considered to be in poor contact.

And further, the upper computer performs longitudinal comparison according to the total resistance value and a preset historical total resistance database, and analyzes the contact state of the elbow structure. The historical total resistance database stores the total resistance value of the normal switch cabinet and the total resistance value of the fault switch cabinet. The upper computer longitudinally compares the measured total resistance value with a historical measured value, for example, the similarity between the measured total resistance value and the total resistance of a normal switch cabinet and the similarity between the measured total resistance value and the total resistance of a fault switch cabinet can be analyzed, and if the similarity between the measured total resistance value and the total resistance of the normal switch cabinet is higher, the contact of the elbow structure is good; if the similarity between the measured total resistance value and the total resistance of the fault switch cabinet is higher, the elbow-shaped structure is in poor contact.

The contact resistance measurement system of the elbow-shaped structure of the cable terminal of the distribution switch cabinet also comprises a connection upper partA display device of the machine. The upper computer can display the total resistance R obtained by calculation through the display device_{General assembly}And contact resistance R_{Contact with}For the tester to look at, or by the tester based on the measured total resistance R_{General assembly}The contact state of the elbow structure is analyzed. The upper computer can also be based on the total resistance R_{General assembly}After the contact state of the elbow-shaped structure is analyzed, the analysis result is sent to a display device to be displayed, so that a tester can check the analysis result.

The contact resistance measuring system of the elbow-shaped structure of the cable terminal of the distribution switch cabinet further comprises a storage device connected with an upper computer. The upper computer can calculate the total resistance R_{General assembly}Contact resistance R_{Contact with}And sending the analysis result to a storage device for storage. In addition, the contact resistance measurement system of the elbow-shaped structure of the cable terminal of the distribution switch cabinet can also comprise a communication device connected with an upper computer, and the upper computer can also calculate the obtained total resistance R_{General assembly}Contact resistance R_{Contact with}And the analysis result is transmitted in a wired or wireless mode through the communication device, so that data interaction is facilitated.

The contact resistance measuring system of the elbow-shaped structure of the cable terminal of the distribution switch cabinet further comprises a power supply device connected with an upper computer. The power supply device can be connected with an external power supply to supply power to the upper computer. In addition, the contact resistance measurement system with the elbow-shaped structure of the cable terminal of the distribution switch cabinet can also comprise an energy storage element connected with an upper computer, and the energy storage element can be an energy storage capacitor, a rechargeable battery and the like. The host computer can also supply energy through the energy storage element and charge the energy storage element when being connected with an external power supply.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.