Method for live access of no-load cable and detection device

Abstract

The invention belongs to the technical field of power equipment maintenance, and particularly discloses a method for live access of a no-load cable, which comprises the following steps: S1, preparation work before operation; s2, a bearing platform used for carrying a constructor is moved to the position below the terminal of the to-be-accessed cable, and the constructor carries out electricity testing on the to-be-accessed cable through an electroscope installed on an insulating rod; s3, the bearing platform is moved to the position below the 10kV three-phase cable, and the detection device carries out insulation detection on the phases of the 10kV three-phase cable and the ground of each phase of the 10kV three-phase cable; s4, using an insulating rod to overlap a cable lead to be accessed; and S5, the constructor withdraws the cable out of the electrified area after checking that cable connection meets the requirements. S3, a detection step: S31, connecting the 10kV three-phase cable with a detection device through an insulating clamp; s32, completing insulation resistance detection of each phase and each phase through a detection device in a one-key manner, and analyzing and judging a load state; and S33, after the detection device is discharged, the connection between the detection device and the 10kV three-phase cable is removed, so that the safety and the measurement efficiency of the constructors are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power equipment maintenance, and particularly relates to a method for live access to an unloaded cable and a detection device. BACKGROUND

[0002] With the continuous development of distribution networks in the direction of cable, the cable and overhead conductor hybrid line is a common distribution equipment in cities. In the process of 10kV distribution network transformation, it is often necessary to access the newly laid or power-off maintenance completed cable to the overhead line in a live working manner.

[0003] The traditional access cable method directly contacts the live body by wearing an insulating glove by the construction personnel, and especially the insulation resistance of each phase and each phase of the 10kV three-phase cable needs to be repeatedly connected or disconnected to connect or disconnect the required phase conductor and insulation resistance meter, which is not only low in measurement efficiency but also low in safety of the construction personnel. SUMMARY

[0004] The purpose of the application is to provide a method for live access to an unloaded cable, which uses an insulating rod to operate in each link and uses a detection device to detect the insulation resistance of each phase and each phase to ground of the 10kV three-phase cable, thereby improving the safety and measurement efficiency of the construction personnel.

[0005] The purpose of the application is achieved by such a technical scheme, and specifically provides a method for live access to an unloaded cable, including the following operation steps:

[0006] S1. Preparation before operation;

[0007] S2. Moving a bearing platform for carrying the construction personnel to below the terminal of the cable to be accessed, and the construction personnel performs electricity testing on the cable to be accessed through a static electricity detector installed on an insulating rod;

[0008] S3. Moving the bearing platform to below the 10kV cable, and a detection device detects the insulation of each phase and each phase to ground of the 10kV three-phase cable;

[0009] S4. Using the insulating rod to lap the lead of the cable to be accessed;

[0010] S5. The construction personnel checks that the cable connection meets the requirements and withdraws from the live area;

[0011] S3 includes the following detection steps:

[0012] S31. Connecting the 10kV three-phase cable to the detection device through an insulating clamp;

[0013] S32. Completing the insulation resistance detection of each phase and each phase through the one-key detection of the detection device, automatically discharging each phase after detection, and analyzing and judging the load state;

[0014] S33. Remove the detection device from the 10kV three-phase cable connection.

[0015] Preferably, S32 completes the detection of the insulation resistance of each phase and between each phase by the detection device with one key, discharges each phase automatically after detection, analyzes and judges the load state, including the following operation steps:

[0016] S321. The detection device checks the 10kV three-phase cable wiring state;

[0017] S322. The detection results are displayed on the display screen of the detection device, and the manual confirmation state is entered to wait for the detection device to start;

[0018] S323. Start the detection device, measure A phase to B phase, C phase and ground, B phase to A phase, C phase and ground, C phase to A phase, B phase and ground in turn, and obtain the insulation resistance between each phase;

[0019] S324. After the test is completed, the detection device discharges A phase, B phase and C phase;

[0020] S325. Process the measurement data.

[0021] Preferably, the detection results are transmitted to the monitoring personnel through Wifi or through USB interface download.

[0022] Preferably, before the 10kV three-phase cable is connected with the detection device, the main lead of the 10kV three-phase cable is provided with insulation shielding.

[0023] Preferably, S4 uses an insulated rod to lap the lead of the cable to be connected, including the following operation steps: S41. Install the lead at the terminal of the 10kV three-phase cable and fix it to prevent bouncing; S42. Three sets of arc suppression switches with insulated operating rods are used to suppress the arc of the main lead of the 10kV three-phase cable; S43. The main lead of the 10kV three-phase cable and the three-phase corresponding lap of the cable to be connected are respectively lapped.

[0024] Preferably, S42 uses three sets of arc suppression switches to suppress the arc of the main lead of the 10kV three-phase cable, including the following steps:

[0025] S421. Hang three sets of arc suppression switches with insulated operating rods to the main lead of the 10kV three-phase cable, and tighten and fix them, the insulated lead line has been fixed to the lower connection post position of the arc suppression switch;

[0026] S422. Use the insulated operating rod to fix the other end of the insulated lead line on the arc suppression switch at the terminal position of the 10kV three-phase cable;

[0027] S423. First close the far side phase arc suppression switch, and use the ammeter with operating rod to measure the current flow of the insulated lead line;

[0028] S424. Using the insulated operating rod for the lap joint, the far side phase cable lead is lapped to the far side phase main lead, and the current meter is used to measure the lead through-flow condition;

[0029] S425. The arc extinguishing switch is pulled open;

[0030] S426. The insulated lead is removed at the cable terminal, and the far side phase arc extinguishing switch is removed;

[0031] S427. Referring to steps S421-S426, the lap joint of the middle phase cable lead and the near side phase cable lead is sequentially completed.

[0032] Preferably, the distance between the lead and the adjacent 10kV three-phase cable main lead is less than 0.6m, and the insulation is shielded.

[0033] Due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0034] Each link of the lap joint of the cable lead to be connected is connected through the use of various professional insulated operating rods, the traditional direct touch cable lap joint no-load lead method is improved, and the safety of the construction personnel is improved; the detection device is used to complete the connection, test, reading of all data to be detected and discharge at one time, and the construction personnel can directly judge whether the cable equipment to be connected to the power grid has an insulation defect, the safety and measurement efficiency of the construction personnel are improved, and the labor intensity of the construction personnel is reduced.

[0035] Another object of the present application is to provide a detection device, which can complete the insulation resistance detection of each phase and each phase of the 10kV three-phase cable at one time, and improve the detection efficiency.

[0036] Another object of the present application is achieved by the technical scheme, and specifically provides a detection device, which comprises an insulation resistance meter, a first group of control switch modules, a second group of control switch modules, a third group of control switch modules, a connection terminal, a controller, a control switch driving chip, a discharge module and a display module; the control switch driving chip, the insulation resistance meter and the display module are electrically connected with the controller, the connection terminal is connected with the 10kV three-phase cable, the control switch driving chip drives the first group of control switch modules, the second group of control switch modules and the third group of control switch modules to disconnect or connect the electrical connection between the connection terminal and the insulation resistance meter, one end of the discharge module is connected with the 10kV three-phase cable through the third group of control switch modules, and the other end is connected with the ground.

[0037] Preferably, the discharge module comprises a second resistor and a tenth control switch, one end of the tenth control switch is connected with the third group of control switch modules, the other end is connected with the second resistor, and the other end of the second resistor is connected with the ground.

[0038] Preferably, the detection device further comprises a Bluetooth module, and the Bluetooth module is connected with the controller.

[0039] By adopting the technical scheme, the application has the beneficial effects:

[0040] The detection device tests and discharges in one time by using the phase conversion technology, thereby improving the detection efficiency and the safety of construction personnel. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the application, the drawings needed in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn according to the actual proportion.

[0042] Figure 1 The figure is a schematic diagram of the steps of the method for electrifying and accessing the unloaded cable of the application;

[0043] Figure 2 The figure is a schematic diagram of the detection process steps of the detection device;

[0044] Figure 3 The figure is a schematic diagram of the operation steps of the unloaded cable lead connection with the insulating rod;

[0045] Figure 4 The figure is a schematic diagram of the detection device;

[0046] Figure 5 The figure is a schematic diagram of the principle of the detection device.

[0047] Reference signs:

[0048] 1-insulation resistance meter, 11-first terminal, 12-second terminal, 121-resistor, 13-option key, 14-test key, 15-stop key, 16-Bluetooth module, 17-wiring terminal, 171-A phase wiring terminal, 172-B phase wiring terminal, 173-C phase wiring terminal, 174-ground wiring terminal, 175-shielding layer wiring terminal, 18-display module, 181-display screen;

[0049] 2-first group of control switch modules, 21-first control switch, 22-second control switch, 23-third control switch;

[0050] 3-second group of control switch modules, 31-fourth control switch, 32-fifth control switch, 33-sixth control switch;

[0051] 4-10kV three-phase cable, 41-A phase conductor, 42-B phase conductor, 43-C phase conductor;

[0052] 5-controller, 51-data storage module, 6-control switch driving chip, 7-third group of control switch modules, 71-seventh control switch, 72-eighth control switch, 73-ninth control switch;

[0053] 8 - discharge module, 81 - second resistor, 82 - tenth control switch, 9 - connecting line. DETAILED DESCRIPTION

[0054] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings.

[0055] Please refer to Figure 1 and Figure 2 A method for electrified access to a dead cable, comprising the following operation steps:

[0056] S1. Preparation before operation;

[0057] S2. Moving the carrying platform for carrying the construction personnel to below the terminal of the cable to be accessed, and the construction personnel checks the voltage of the cable to be accessed through the electroscope installed on the insulating rod;

[0058] S3. Moving the carrying platform to below the 10kV cable, and detecting the insulation between phases and each phase to ground of the 10kV three-phase cable by the detection device;

[0059] S4. Lapping the lead of the cable to be accessed with the insulating rod;

[0060] S5. The construction personnel checks the cable connection to meet the requirements and withdraws from the electrified area;

[0061] S3 includes the following detection steps:

[0062] S31 connects the 10kV three-phase cable with the detection device through the insulating clamp;

[0063] S32. Completes the insulation resistance detection of each phase and each phase through the detection device one key, automatically discharges each phase after detection, analyzes and judges the load state;

[0064] S33. Disconnects the detection device from the 10kV three-phase cable.

[0065] Specifically, the preparation work before S1. operation includes the following: S11 checks the cable layout to be accessed, masters the model, length, test situation of the cable to be accessed, and the state of the equipment connected in the rear section, and preliminarily confirms the initial state of the cable to be accessed. S12 checks whether the required tools and protective appliances, such as detection devices, various types of insulated operating rods, arc extinguishing switches, insulating ropes, lapping tools, etc., are in good condition, each detection device performs self-checking, and the insulation resistance of the insulation tools such as the electric tester, the insulating rod, the insulating gloves and the insulating clothes should be qualified, the quick opening and closing of the arc extinguishing switch is normal, and it has locking function. S13. Check the insulating bearing platform (insulating boom truck or insulating platform), check and wear insulating protective appliances, check the double name of the tower and the naming of the cable equipment, and start entering the live area operation. In the S2 step, the electric tester uses the prior art, such as the authorized announcement No. CN118777674B, the name of a kind of electric tester, or the authorized announcement No. CN109830818B, the name of a kind of cable electric test and grounding integrated device, the construction personnel holds the insulating rod, and the terminal of the cable to be accessed, the support of the cable to be accessed, etc. Electric test is carried out, it is confirmed that there is no opposite side of the cable to be accessed. Reverse power, confirm that the insulation between the overhead live main conductor and the ground potential component is good, and there is no obvious induced current. If abnormalities are found, take measures until the electric test is qualified. In the step of S31, the insulating clamp uses the prior art, and the 10kV three-phase cable is connected with the terminal on the detection device according to the predetermined position. In the S4 step, first, the connection part of the cable to be accessed and the 10kV three-phase cable is checked, and it is ensured that the clamp is installed correctly, and the lead connection is firm; Then check whether the clearance distance between the lead and the lead, and between the lead and the ground potential component meets the operation requirements, etc., after the check is correct, remove the safety measures, and clean the work site.

[0066] The method for live access to the unloaded cable of the application, from the electric test of the cable to be accessed, the insulation detection of each phase and each phase to ground of the 10kV three-phase cable to the lapping of the lead of the cable to be accessed, all through the use of various types of professional insulating operating rods, improves the traditional direct touch cable lapping unloaded lead method, improves the safety of the construction personnel; Using the detection device, the wiring, testing and reading all the data required for detection can be completed at one time, that is, 6 times of testing of the prior art can be completed, and the operator can directly judge whether the cable equipment to be accessed to the power grid has insulation defects, improve the measurement efficiency, and reduce the labor intensity of the construction personnel.

[0067] Further, S32 comprises the following operation steps: S321. The detection device checks the 10kV three-phase cable connection state; S322. The detection result is displayed on the display screen of the detection device, and the manual confirmation state is entered to wait for the detection device to start; S323. The detection device is started, and A phase to B phase, C phase and ground, B phase to A phase, C phase and ground, C phase to A phase, B phase and ground are measured in turn to obtain the insulation resistance between phases; S324. After the test is completed, the detection device discharges A phase, B phase and C phase; S325. The measurement data is processed. Specifically, the detection device performs self-checking on the 10kV three-phase cable connection state, checks whether the connection is correct and whether the connection is loose, displays the results on the display screen after self-checking, and can enter detection only after the construction personnel confirm and press the start button, thereby improving the safety of detection. Using the detection device, various data in the test process are recorded, including the insulation resistance value between phases, discharge signal characteristics and the like.

[0068] Further, the detection result is downloaded to the monitoring personnel through Wifi or through the USB interface. The monitoring personnel processes and analyzes the test data to judge the insulation state and discharge condition of the cable. If necessary, the detection result is prepared into a test report to provide a scientific basis for the operation and maintenance of the cable.

[0069] Further, before the 10kV three-phase cable is connected to the detection device, the main lead of the 10kV three-phase cable is provided with insulation shielding.

[0070] Further, please refer to Figure 3, S4. The lap cable lead-in operation includes the following operation steps: S41. 10kV three-phase cable terminal installation lead and anti-bounce fixation; S42. Three sets of arc suppression switch with insulated operating rod are used to suppress arc for 10kV three-phase cable main conductor; S43. 10kV three-phase cable main conductor and the three-phase corresponding lap cable are connected respectively. Specifically, the anti-bounce fixation uses the prior art. The 10kV three-phase cable arc suppression switch uses the prior art, such as the arc suppression method for 10kV live working disclosed in the authorized announcement CN115085172B, named a kind of arc suppression method for 10kV live working. S42 includes the following steps: S421. Three sets of arc suppression switches are respectively hung to 10kV three-phase cable main conductor, and are tightly fixed. The insulated lead-in wire is fixed to the lower terminal post position of the arc suppression switch. S422. The other end of the insulated lead-in wire on the arc suppression switch is fixed to the 10kV three-phase cable terminal position by using the insulated operating rod. S423. The far edge phase arc suppression switch is closed first, and the current table with operating rod is used to measure the current flow of the insulated lead-in wire. S424. The far edge phase cable lead is connected to the far edge phase main conductor by using the insulated operating rod for lap lead, and the current table is used to measure the current flow of the lead. S425. The arc suppression switch is pulled open. S426. The insulated lead-in wire at the cable terminal is removed, and the far edge phase arc suppression switch is removed. S427. Refer to steps S421-S426, respectively, to complete the lap middle phase cable lead and near edge phase cable lead in turn.

[0071] Further, the distance between the lead and the adjacent phase is less than 0.6m, and the insulation shielding.

[0072] Please refer to Figure 4 and Figure 5The application provides a detection device, which comprises an insulation resistance meter 1, a first group of control switch modules 2, a second group of control switch modules 3, a third group of control switch modules 7, a wiring terminal 17, a controller 5, a control switch driving chip 6, a discharge module 8 and a display module 18. The control switch driving chip 6, the insulation resistance meter 1 and the display module 18 are electrically connected with the controller 5, the wiring terminal 17 is connected with a 10kV three-phase cable 4, the control switch driving chip 6 drives the first group of control switch modules 2, the second group of control switch modules 3 and the third group of control switch modules 7 to disconnect or connect the electrical connection between the wiring terminal 17 and the insulation resistance meter 1, one end of the discharge module 8 is connected with the 10kV three-phase cable 4 through the third group of control switch modules 7, and the other end is connected with the ground through a tenth control switch 81. Specifically, the shell of the insulation resistance meter 1 is made of insulating plastic, the insulation resistance meter 1 is provided with a test key 14, a stop key 15 and an option key 13, the test key 14 is used for starting the detection device to detect, the stop key 15 is used for pausing the detection of the detection device, and the option key 13 can be used for selecting a detection item or checking a test result. The insulation resistance meter 1 is provided with a first end connector 11 and a second end connector 12, the first group of control switch modules 2 comprises a first control switch 21, a second control switch 22 and a third control switch 23, the second group of control switch modules 3 comprises a fourth control switch 31, a fifth control switch 32 and a sixth control switch 33, and the third group of control switch modules 7 comprises a seventh control switch 71, an eighth control switch 72 and a ninth control switch 73. The 10kV three-phase cable 4 comprises an A-phase wire 41, a B-phase wire 42 and a C-phase wire 43; the wiring terminal 17 comprises an A-phase wiring terminal 171, a B-phase wiring terminal 172, a C-phase wiring terminal 173, a ground wiring terminal 174 and a shielding layer wiring terminal 175. One end of the A-phase wiring terminal 171 is connected with the first end connector 11 through the first control switch 21, and the other end is connected with the second end connector 12 through the fourth control switch 31 and a first resistor 121; one end of the B-phase wiring terminal 172 is connected with the first end connector 11 through the second control switch 22, and the other end is connected with the second end connector 12 through the fifth control switch 32 and the first resistor 121; one end of the C-phase wiring terminal 173 is connected with the first end connector 11 through the third control switch 23, and the other end is connected with the second end connector 12 through the sixth control switch 33 and the first resistor 121. One end of the seventh control switch 71 is connected with the A-phase wiring terminal 171, and the other end is grounded; one end of the eighth control switch 72 is connected with the B-phase wiring terminal 172, and the other end is grounded; one end of the ninth control switch 73 is connected with the C-phase wiring terminal 173, and the other end is grounded. The ground wiring terminal 174 and the shielding layer wiring terminal 175 are arranged between the second end connector 12 and the first resistor 121.The control switch driving chip 6 is electrically connected with the first control switch 21, the second control switch 22, the third control switch 2, the fourth control switch 31, the fifth control switch 32, the sixth control switch 33, the seventh control switch 71, the eighth control switch 72 and the ninth control switch 73 respectively, and the control switch driving chip 6 drives the connection or disconnection of each control switch. The controller 5 is also provided with a data storage module 51 for storing data and programs, and the display module 18 is provided with a display screen 181. In use, firstly, the A-phase wire, the B-phase wire and the C-phase wire of the 10kV three-phase cable 4 are connected with the A-phase terminal 171, the B-phase terminal 172 and the C-phase terminal 173 respectively through the connecting wires 9, one end of the connecting wire 9 is detachably connected with the terminal 17 through a screw, and the other end is provided with a clamp, which is a crocodile clamp in the prior art, so as to clamp each phase wire of the 10kV three-phase cable 4. The clamp at one end of the connecting wire 9 on the ground wire terminal 174 is connected with the grounding steel tape of the 10kV three-phase cable, and the shielding layer terminal 175 is used according to the need. Then the detection device is started, the detection device checks the connection state, and the result is displayed on the display screen 181, such as the display result OK, the test key 14 is pressed, and A phase is measured against B phase, C phase and ground, B phase is measured against A phase, C phase and ground, C phase is measured against A phase, B phase and ground in turn, the resistance between each phase is obtained, and the test data is saved. After the test is completed, the discharge of each phase wire of the 10kV three-phase cable 4 after the test is completed.

[0073] The test principle is as follows: the one-key detection function of the detection device is realized by the preprogrammed controller 5, when the test key 14 is pressed by the construction personnel, the controller 5 automatically controls each control switch module to switch the circuit path according to the preset order, and the insulation resistance detection of each phase and the interphase is completed in turn, and the result is displayed in real time through the display screen 181. For example, if the insulation resistance meter 1 needs to measure the insulation resistance value of the A-phase wire, through pre-programming, the controller 5 issues an instruction to control the control switch driving chip 6 to connect the first control switch 21, the eighth control switch 72 and the ninth control switch 73, and the other control switches are in the disconnected state, that is, the first end connector 11 of the insulation resistance meter 1 is connected with the A-phase wire, the B-phase wire and the C-phase wire are connected with the ground; similarly, if the insulation resistance meter 1 needs to measure the insulation resistance value of the B-phase wire or the C-phase wire, the corresponding phase wire is connected with the first end connector 11, and the other two phase wires are connected with the ground wire. For example, if the insulation resistance meter 1 needs to measure the A-B interphase insulation resistance, the control switch driving chip 6 is connected with the first control switch 21, the fifth control switch 32 and the ninth control switch 73, and the other control switches are in the disconnected state; similarly, if the insulation resistance meter 1 needs to measure the A-C phase line or the B-C phase line insulation resistance value, the corresponding test phase wire is connected with the first end connector 11, the other test phase wire is connected with the second end connector 12 through the corresponding control switch and the first resistor 121, and the untested phase wire is connected with the ground wire.

[0074] Further, the discharging module 8 comprises a second resistor 81 and a tenth control switch 82, one end of the tenth control switch 82 is connected with the third group of control switch module 7, the other end is connected with the second resistor 81, the other end of the second resistor 81 is connected with the ground. The second resistor 81 is a discharging resistor, when the detection is completed, the control switch driving chip 6 drives the 71-seventh control switch, the 72-eighth control switch, the 73-ninth control switch and the tenth control switch 82 to be connected, and other control switches are turned off, so as to complete the discharging of each phase conductor and the discharging of the detection device.

[0075] Further, the detection device further comprises a Bluetooth module 16, and the Bluetooth module 16 is connected with the controller 5. The Bluetooth module 16 is arranged to transmit the test result to the monitoring personnel in time, and the monitoring personnel processes and analyzes the data.

[0076] The method and the detection device for electrifying the unloaded cable of the application improve the traditional direct touching method of the cable lapping unloaded lead, improve the safety of the construction personnel, complete the test of multiple phase combination modes at one time through the commutation technology, transmit the detection data to the monitoring personnel in time through the Bluetooth module 16, and the operator can directly judge whether the cable equipment to be connected to the power grid has insulation defects, and the detection device is automatically discharged after the detection is completed through the discharging module, so as to improve the measurement efficiency and the safety of the construction personnel, and reduce the labor intensity of the construction personnel.

[0077] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the application, and it should be understood that the above description is only a specific implementation method of the application, and is not used to limit the application, and any modification, equivalent replacement and improvement within the spirit of the application should be included in the protection scope of the application.

Claims

1. A method for live access to an unloaded cable, characterized in that: The steps are as follows: S1. Preparation before operation; S2. Move the platform carrying the construction personnel to the bottom of the terminal where the cable is to be connected. The construction personnel then test the cable using a tester mounted on an insulating rod. S3. Move the carrying platform to the bottom of the 10kV three-phase cable, and test the insulation between the phases and each phase to ground of the 10kV three-phase cable using the detection device; S4. Use insulating rods to set up the incoming cable lead operation; S5. Construction personnel shall evacuate the energized area after checking that the cable connections meet the requirements; S3 includes the following detection steps: S31. Connect the 10kV three-phase cable to the detection device through an insulating clamp; S32. The detection device completes the insulation resistance test of each phase and between phases with one click. After the test, each phase is automatically discharged to analyze and determine the load status; S33. Dismantle the detection device and connect it to the 10kV three-phase cable.

2. The method for live access to an unloaded cable according to claim 1, characterized in that: S32 includes the following steps: S321. Detection device checks the 10kV three-phase cable connection status; S322. The test results are displayed on the display screen of the detection device, and the detection device enters the manual confirmation state and waits for the detection device to start; S323 starts the detection device and sequentially measures the insulation resistance between phases A and B, phase C, and ground; between phases B and A, phase C, and ground; and between phases C and A, phase B, and ground to obtain the insulation resistance between the phases. S324. After the test is completed, the detection device discharges phases A, B, and C; S325. Process the measurement data.

3. The method for live access to an unloaded cable according to claim 2, characterized in that: The test results are transmitted to the monitoring personnel via Wi-Fi or USB interface download data.

4. The method for live access to an unloaded cable according to any one of claims 1 to 3, characterized in that: Before connecting the 10kV three-phase cable to the detection device, provide insulation shielding for the main conductor of the 10kV three-phase cable.

5. The method for live access to an unloaded cable according to any one of claims 1 to 3, characterized in that: S4. Use insulating rods to connect the lead wires of the cables to be connected, including the following steps: S41. Install the lead wires at the 10KV three-phase cable terminal and fix them to prevent them from bouncing; S42. Use three sets of arc suppression switches with insulating operating rods to extinguish arcs on the main conductors of the 10kV three-phase cable respectively; S43. Connect the main conductors of the 10kV three-phase cable to the three phases of the cable to be connected respectively.

6. The method for live access to an unloaded cable according to claim 5, characterized in that: S42 uses three sets of arc suppression switches with insulated operating rods to extinguish arcs on the main conductors of a 10kV three-phase cable, including the following steps: S421. Attach three arc-suppression switches with insulated operating rods to the main conductors of the 10kV three-phase cable and tighten them securely. The insulated drain wires are secured to the lower terminals of the arc-suppression switches. S422. Use the insulating operating rod to fix the other end of the insulated drain wire on the arc suppression switch to the 10kV three-phase cable terminal; S423. First, close the arc-suppression switch on the remote phase and use an ammeter with an operating lever to measure the current flowing through the insulated drain wire. S424. Use an insulated operating rod to connect the remote phase cable lead to the remote phase main conductor using a bonding lead. Use an ammeter to measure the current flowing through the lead. S425. Pull open the arc suppression switch; S426. Remove the insulated drain wire at the cable terminal and remove the arc extinguishing switch on the far side; S427. Referring to steps S421-S426, complete the splicing of the middle phase cable lead and the near-side phase cable lead in sequence.

7. The method for live access to an unloaded cable according to claim 5 or 6, characterized in that: The distance between the lead wire and the adjacent 10kV three-phase cable main wire is less than 0.6m and is insulated and shielded.

8. A detection device applied to the method of live access to an unloaded cable according to any one of claims 1 to 7, characterized in that: include: An insulation resistance meter (1), a first group of control switch modules (2), a second group of control switch modules (3), a third group of control switch modules (7), a wiring terminal (17), a controller (5), a control switch driving chip (6), a discharge module (8) and a display module (18); the control switch driving chip (6), the insulation resistance meter (1) and the display module (18) are electrically connected to the controller (5); the wiring terminal (17) is connected to a 10kV three-phase cable (4); the control switch driving chip (6) drives the first group of control switch modules (2), the second group of control switch modules (3) and the third group of control switch modules (7) to disconnect or connect the electrical connection between the wiring terminal (17) and the insulation resistance meter (1); one end of the discharge module (8) is connected to the 10kV three-phase cable (4) through the third group of control switch modules (7), and the other end is connected to the ground.

9. The detection device according to claim 8, characterized in that The discharge module (8) comprises a second resistor (81) and a tenth control switch (82), one end of the tenth control switch (82) is connected to the third group of control switch modules (7), and the other end is connected to the second resistor (81), and the other end of the second resistor (81) is connected to the ground.

10. The detection device according to claim 8, characterized in that: The detection device further comprises a Bluetooth module (16), and the Bluetooth module (16) is connected to the controller (5).

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