Line selection system detection device and line selection system detection method

Abstract

The present application discloses a line selection system detection device and a line selection system detection method, belonging to the field of power systems. The line selection system detection device includes a plurality of detectors installed in a plurality of switch cabinets. Two detection insulators and one end of two connecting insulators in each detector are installed on the inner wall of the box body; the first ends of two conductive connectors are respectively movably connected to the other ends of the two detection insulators; a detachable connector is arranged at the other end of the connecting insulator, and forms a detachable connection with the second end of the conductive connector; one end of the test line is connected to one of the two detection insulators, and the other end passes through the zero-sequence current transformer in the switch cabinet and is connected to the other of the two detection insulators; one end of the connecting line is connected to the detachable connector on the connecting insulator, and the other end is connected to the power line. The problem of the line selection function failure of the line selection system in the related art is solved, and the accuracy rate of the line selection function in the line selection system is improved.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular to a line selection system detection device and a line selection system detection method. Background Art

[0002] Small current grounding systems include neutral point ungrounded systems, neutral point arc suppression coil grounding systems and neutral point resistor grounding systems. Most small current grounding systems adopt the neutral point indirect grounding method. When a single-phase grounding fault occurs in the system, the current flowing through the grounding point is very small, the arc at the fault point can be extinguished by itself, and the line voltage between phases remains stacked, which does not affect the power supply to the load. It can still run for 1 to 2 hours after the fault occurs without immediate tripping. Therefore, small current grounding systems are widely used in my country's 6-66kv distribution network. With the development of urban distribution networks, the number of cable lines has gradually increased, and the capacitance current value has increased significantly. Long-term operation can easily cause the fault mine to become a multi-point grounding circuit. Arc grounding can also cause overvoltage in the entire system, thereby damaging the equipment. Destroy the safe operation of the system, so it is particularly important to quickly determine the fault line.

[0003] A small current grounding line selection device in the related art is used in the line selection system, including a single chip microcomputer, a liquid crystal display and a signal indicator light. The single chip microcomputer is the acquisition operation, logic judgment and control center, and the liquid crystal display can display the current current status and indicate the fault line through the signal indicator light. The small current grounding line selection device is connected to the small current grounding system through the through-core lead through the zero-sequence mutual inductor, and the fault line is selected by performing multiple synchronous sampling of the zero-sequence current and comprehensively analyzing the credibility of the sampling.

[0004] However, the small current grounding line selection device in the above-mentioned related technology is prone to inaccurate line selection, which may lead to failure of the line selection function of the line selection system. Summary of the invention

[0005] The embodiment of the present application provides a line selection system detection device and a line selection system detection method. The technical solution is as follows:

[0006] In a first aspect, a line selection system detection device is provided, comprising a plurality of detectors installed in a plurality of switch cabinets, the detectors comprising: a box body, two detection insulators, two connection insulators, two conductive connectors, a test line, and two connection lines;

[0007] The two detection insulators and one end of the two connection insulators are mounted on the inner wall of the box body;

[0008] The first ends of the two conductive connecting members are movably connected to the other ends of the two detection insulators respectively;

[0009] The other end of the connecting insulator is provided with a detachable connector configured to form a detachable connection with the second end of the conductive connector;

[0010] One end of the test wire is connected to one of the two detection insulators, and the other end passes through the zero-sequence current transformer in the switch cabinet and is connected to the other one of the two detection insulators;

[0011] One end of the connecting wire is connected to the detachable connector on the connecting insulator, and the other end is connected to the power line.

[0012] Optionally, the two conductive connectors include a metal strip and an insulating layer wrapped around the metal strip, and the ends of the metal strip protrude from the insulating layer.

[0013] Optionally, the conductive connector further includes a first connecting rod, one end of the metal strip has a through hole, and the first connecting rod passes through the through hole and is connected to the other end of the detection insulator.

[0014] Optionally, the other end of the metal strip has a notch, the detachable connector includes a second connecting rod, the second connector is connected to the other end of the connecting insulator, and when the metal strip rotates around the first connecting rod, the notch can be engaged with the second connecting rod.

[0015] Optionally, the lengths of the two connecting insulators are different.

[0016] Optionally, the box body includes a box bottom, four box walls and a box cover, the box cover is movably connected to the box walls, and one ends of the two detection insulators and the two connecting insulators are installed on the box bottom.

[0017] Optionally, the line selection system detection device further includes a power supply component;

[0018] The power line is composed of the connecting wires of the plurality of detectors and the power supply component, and the plurality of detectors and the power supply component are connected in series through the connecting wires.

[0019] In a second aspect, a line selection system detection method is provided for detecting a line selection system by the line selection system detection device described in the first aspect. The line selection system detection device includes a plurality of detectors installed in a plurality of switch cabinets. The method includes:

[0020] Connect the second end of the first conductive connector among the two conductive connectors of the first detector in the plurality of detectors to the detachable connector of the first connecting insulator among the two connecting insulators of the first detector;

[0021] Connect the second end of the second conductive connector among the two conductive connectors of the first detector to the detachable connector of the second connecting insulator among the two connecting insulators of the first detector;

[0022] Power the first detector through the two connecting wires of the first detector;

[0023] Connect the second end of the first conductive connector of the first detector to the detachable connector of the second connecting insulator of the first detector;

[0024] Connect the second end of the second conductive connector of the first detector to the detachable connector of the first connecting insulator of the first detector;

[0025] If the line selection system has abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is normal;

[0026] If the line selection system does not have abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is faulty.

[0027] Optionally, the line selection system detection device further includes a power supply component, and the multiple detectors and the power supply component are connected in series through connecting wires,

[0028] The step of connecting the second end of the first conductive connector among the two conductive connectors of the first detector among the multiple detectors to the detachable connector of the first connecting insulator among the two connecting insulators of the first detector includes:

[0029] Connect the second end of the first conductive connector of each detector among the multiple detectors to the detachable connector of the first connecting insulator of each detector;

[0030] The step of connecting the second end of the second conductive connector among the two conductive connectors of the first detector to the detachable connector of the second connecting insulator among the two connecting insulators of the first detector includes:

[0031] Connect the second end of the second conductive connector of each detector to the detachable connector of the second connecting insulator of each detector;

[0032] The step of powering the first detector through the two connecting wires of the first detector includes:

[0033] Power the multiple detectors through the power supply component.

[0034] Optionally, after determining that the line selection function of the line selection system for the switch cabinet where the first detector is located is normal, the method further includes:

[0035] Connect the second end of the first conductive connection member of the first detector to the detachable connection member of the first connection insulator of the first detector;

[0036] Connect the second end of the second conductive connection member of the first detector to the detachable connection member of the second connection insulator of the first detector;

[0037] Connect the second end of the first conductive connection member of the second detector among the multiple detectors to the detachable connection member of the first connection insulator of the second detector;

[0038] Connect the second end of the second conductive connection member of the second detector to the detachable connection member of the second connection insulator of the second detector;

[0039] If the line selection system has abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the second detector is located is normal;

[0040] If the line selection system does not have abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the second detector is located fails.

[0041] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0042] A line selection system detection device including multiple detectors is provided, and the multiple detectors are connected in series through connection lines. Circuit switching can be performed between two connection insulators and two detection insulators in each detector through two conductive connection members. When a connection insulator and a detection insulator are respectively connected by switching the conductive connection members, the current flows in the reverse direction, and the circuit connected to this detector fails. At this time, if the line selection system has abnormal readings, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located is normal. If the line selection system does not have abnormal readings, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located fails. And because the detector is connected to the power line, it is possible to detect whether the line selection function of the line selection system is normal without power interruption. The problem of the line selection function failure of the line selection system in the related art is solved, and the accuracy of the line selection function in the line selection system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0044] Figure 1 It is a schematic structural diagram of a line selection system in the related art;

[0045] Figure 2It is a schematic structural diagram of a line selection system detection device provided by an embodiment of the present application;

[0046] Figure 3 is Figure 2 a top view of the detector in the line selection system detection device;

[0047] Figure 4 It is a schematic structural diagram of another line selection system detection device provided by an embodiment of the present application;

[0048] Figure 5 is Figure 4 another schematic structural diagram of the detector in ;

[0049] Figure 6 is Figure 4 a schematic structural diagram of the box body of the detector in ;

[0050] Figure 7 It is a flowchart of a line selection system detection method provided by an embodiment of the present invention;

[0051] Figure 8 It is a flowchart of another line selection system detection method provided by an embodiment of the present invention.

[0052] Through the above-mentioned drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0053] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the drawings.

[0054] In a small current grounding system, when a single-phase grounding fault occurs, it is impossible to quickly confirm which line the problem lies in. Since the phase voltage rise caused by this kind of fault poses a great threat to the insulation performance of the system, it is necessary to quickly detect the faulty line and eliminate it.

[0055] A small current grounding line selection device in the related art is connected to a small current grounding system to form a set of line selection systems. Figure 1 It is a schematic structural diagram of a line selection system in the related art. All the lines connected to the small current grounding line selection device 11 are called a full-loop line selection system. Among them, one end of each connecting line 13 passing through the zero-sequence current transformer 12 is connected to the small current grounding line selection device 11, and the other end is connected to the switch cabinet 14. Each connecting line 13 is a single loop. When a single loop fails, the small current grounding line selection device 11 can display the abnormal current value of the single loop, so that the faulty single loop in the full-loop system can be detected.

[0056] However, after the small current grounding line selection device is connected to the system, if it is necessary to detect the line selection accuracy of the small current grounding line selection device, the single circuit needs to be powered off. However, each single circuit is connected to a switch cabinet to supply domestic electricity to users. If it is necessary to detect the line selection function of the small current grounding line selection device, it is necessary to cut off the power of each single circuit one by one to check whether the small current grounding line selection device shows abnormalities in the powered-off single circuit. The entire detection process requires powering off each switch cabinet in the substation once, which greatly affects the normal domestic electricity consumption of residents.

[0057] The embodiment of the present application provides a line selection system detection device and a line selection system detection method, which can solve the problems existing in the above related technologies.

[0058] Figure 2 It is a schematic structural diagram of a line selection system detection device provided by the embodiment of the present application. Figure 3 is Figure 2 A top view of the detector in the line selection system detection device. The line selection system detection device may include:

[0059] A plurality of detectors 30 installed in a plurality of switch cabinets 20. The detector 30 includes: a box body 31, two detection insulators 321 and 322, two connection insulators 331 and 332, two conductive connectors 341 and 342, a test line 35, and two connection lines 361 and 362.

[0060] One end of the two detection insulators 321 and 322 and one end of the two connection insulators 331 and 332 are installed on the inner wall of the box body 31.

[0061] The first ends of the two conductive connectors 341 and 342 are respectively movably connected to the other ends of the two detection insulators 321 and 322.

[0062] The other ends of the connection insulators 331 and 332 are provided with detachable connectors 343, which are configured to form a detachable connection with the second ends of the conductive connectors 341 and 342.

[0063] One end of the test line 35 is connected to one of the two detection insulators 321 and 322, and the other end passes through the zero-sequence current transformer 21 in the switch cabinet 20 and is connected to the other detection insulator 322.

[0064] One ends of the connection lines 361 and 362 are connected to the detachable connectors 343 on the connection insulators, and the other ends are connected to the power line 40.

[0065] In summary, the detection device of the line selection system provided by the embodiment of the present application includes a plurality of detectors, and the plurality of detectors are connected in series through connection lines. Between the two connection insulators and the two detection insulators in each detector, line switching can be performed through two conductive connectors. When a connection insulator and a detection insulator are respectively connected by switching the conductive connectors, the current flows in the reverse direction, and the circuit connected to this detector fails. At this time, if the line selection system shows abnormal readings, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located is normal. If the line selection system does not show abnormal readings, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located fails. And because the detector is connected to the power line, it is possible to detect whether the line selection function of the line selection system is normal without power interruption. This solves the problem of the line selection function failure of the line selection system in the related art and improves the accuracy of the line selection function in the line selection system.

[0066] Please refer to Figure 4 , which shows a top view of the detector in the line selection system detection device provided by the embodiment of the present application.

[0067] Optionally, the two conductive connectors 341 and 342 include a metal strip 344 and an insulating layer 345 wrapped around the metal strip 344, and the ends of the metal strip 344 protrude from the insulating layer 345. When the circuit is operating normally, among the two conductive connectors, one end of the conductive connector 341 is connected to the detection insulator 321, and the other end is connected to the connection insulator 331; one end of the conductive connector 342 is connected to the detection insulator 322, and the other end is connected to the connection insulator 332; that is, the two conductive connectors 341 and 342 are arranged in parallel and do not contact each other.

[0068] Figure 5 For Figure 4 Another structural schematic diagram of the detector in. When the detector starts to simulate a faulty circuit, the end of the conductive connector 341 connected to the connection insulator 331 is moved to the connection insulator 332, and the end of the conductive connector 342 connected to the connection insulator 332 is moved to the connection insulator 331, so that the two conductive connectors 341 and 342 cross each other to form a simulated faulty circuit. To prevent short circuits caused by contact between the metal strips when the two conductive connectors 341 and 342 cross, an insulating layer 345 can be wrapped around the metal strip 344, and the ends of the metal strip 344 connected to the insulator are exposed from the insulating layer 345. The specific material of the insulating layer 345 is not limited in the embodiment of the present application.

[0069] Optionally, the conductive connectors 341 and 342 further include a first connecting rod 346. One end of the metal strip 344 has a through hole, and the first connecting rod 346 passes through the through hole and is connected to the other ends of the detection insulators 321 and 322. When the detector simulates a faulty circuit, the circuit is switched by moving one end of the two conductive connectors 341 and 342. Therefore, one end of the two conductive connectors 341 and 342 connected to the detection insulators can be connected through the first connecting rod 346. One end of the first connecting rod 346 is connected to the through hole on the metal strip 344, and the other end is connected to the detection insulator. When switching the conductive connector, the end connected to the first connecting rod 346 rotates along the axis of the detection insulator until the other end of the metal strip 344 moves from one connecting insulator to another connecting insulator.

[0070] Optionally, the other end of the metal strip 344 has a notch, and the detachable connector includes a second connecting rod 347. The second connecting member 347 is connected to the other ends of the connecting insulators 331 and 332. When the metal strip 344 rotates with the detection insulator as the axis, the notch can be engaged with the second connecting rod 347. When the detector switches the circuit, the metal strip 344 connected to the connecting insulator 331 is moved to the connecting insulator 332. To make the metal strip 344 easy to connect during switching, a groove can be provided on the metal strip 344. When the metal strip 344 is moved to the connecting insulator 332, the groove on the metal strip 344 is engaged with the second connecting member 347 on the connecting insulators 331 and 332 to form a connection.

[0071] Optionally, the lengths of the two connecting insulators are different. To avoid short circuit caused by the contact of the metal strip 344 when the two conductive connectors 341 and 342 cross during the simulation of a faulty circuit, when the lengths of the two connecting insulators are different, after being installed inside the box body, the heights of the two connecting insulators are different. After switching the two conductive connectors, a height difference is formed in the connection of the two conductive connectors, avoiding short circuit caused by the contact of the metal strip 344 during crossing. The two detection insulators can also be respectively set to be the same length as the two connecting insulators. When cross-connected, a group of detection insulators connected to one conductive connector has the same length as the connecting insulator, which can better avoid the contact of the metal strip between the two connecting insulators.

[0072] Figure 6 For Figure 4 Schematic diagram of the box body structure of the detector in

[0073] Optionally, the box body 31 includes a box bottom 311, four box walls 312, and a box cover 313. The box cover 313 is movably connected to the box walls 312. One end of two detection insulators and two connection insulators is installed on the box bottom. The four box walls 312 may be provided with through holes for test lines and connection lines to pass through. The box body 31 may be made of insulating material. The box cover 313 may further include a multi-functional data table (not shown in the figure). The multi-functional data table may display the current current. When simulating a circuit fault, it may display the current at the time of the fault.

[0074] As Figure 2 shown, optionally, the line selection system detection device further includes a power supply assembly 40; the power supply line is composed of connection lines of multiple detectors and the power supply assembly 40. The multiple detectors and the power supply assembly 40 are connected in series through the connection lines. The power supply assembly 40 provides power for the line selection system detection device. When simulating a faulty circuit, the power supply of the switch cabinet does not need to be disconnected. Therefore, the line selection system detection device in the present application can detect the accuracy of the line selection function of the line selection system without power-off.

[0075] In summary, the embodiment of the present application provides a line selection system detection device including multiple detectors, and the multiple detectors are connected in series through connection lines. Between the two connection insulators and the two detection insulators in each detector, line switching can be performed through two conductive connectors. When a connection insulator and a detection insulator are connected respectively by switching the conductive connectors, the current flows in the reverse direction, and the circuit connected to this detector has a fault. At this time, if the line selection system shows an abnormal reading, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located is normal. If the line selection system does not show an abnormal reading, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located is faulty. And because the detector is connected to the power supply line, it is possible to detect whether the line selection function of the line selection system is normal without power-off. This solves the problem of the line selection function failure of the line selection system in the related art and improves the accuracy rate of the line selection function in the line selection system.

[0076] Figure 7 FIG. 12 is a flowchart of a line selection system detection method provided by an embodiment of the present invention. This method can be used for the line selection system detection device in any of the above embodiments. The line selection system detection device includes multiple detectors installed in multiple switch cabinets. This method includes:

[0077] Step 701: Connect the second end of the first conductive connector among the two conductive connectors of the first detector among the multiple detectors to the detachable connector of the first connection insulator among the two connection insulators of the first detector.

[0078] Step 702: Connect the second end of the second conductive connector among the two conductive connectors of the first detector to the detachable connector of the second connecting insulator among the two connecting insulators of the first detector; supply power to the first detector through the two connecting wires of the first detector.

[0079] Step 703: Connect the second end of the first conductive connector of the first detector to the detachable connector of the second connecting insulator of the first detector.

[0080] Step 704: Connect the second end of the second conductive connector of the first detector to the detachable connector of the first connecting insulator of the first detector.

[0081] Step 705: Judge the line selection function of the line selection system: If the line selection system shows abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is normal; if the line selection system does not show abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is faulty.

[0082] In summary, the embodiment of the present application provides a line selection system detection method for a line selection system detection device including multiple detectors, and the multiple detectors are connected in series through connecting wires. Between the two connecting insulators and the two detection insulators in each detector, line switching can be performed through two conductive connectors. When a connecting insulator and a detection insulator are connected respectively by switching the conductive connectors, the current flows in the reverse direction, and the circuit connected to this detector fails. At this time, if the line selection system shows abnormal readings, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located is normal; if the line selection system does not show abnormal readings, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located is faulty. And because the detector is connected to the power line, it is possible to detect whether the line selection function of the line selection system is normal without power interruption. This solves the problem of the faulty line selection function in the related art and improves the accuracy of the line selection function in the line selection system.

[0083] Figure 8 It is a flowchart of another line selection system detection method provided by an embodiment of the present invention. This method can be used for the line selection system detection device in any of the above embodiments. The line selection system detection device includes multiple detectors installed in multiple switch cabinets, and also includes a power supply component. The multiple detectors and the power supply component are connected in series through connecting wires. This method includes:

[0084] Step 801: Connect the second end of the first conductive connector of each detector among the multiple detectors to the detachable connector of the first connecting insulator of each detector.

[0085] The line selection system detection device is connected to the switch cabinet and is mostly used in the power supply system of substations. Usually, there are multiple switch cabinets in the power supply system of substations. Therefore, each detector in the line selection system detection device is connected to a switch cabinet to simulate the line fault of a single circuit where the switch cabinet is located. First, connect the circuits of each detector into normal circuits. Connect the second end of the first conductive connector to the first connecting insulator.

[0086] Step 802: Connect the second end of the second conductive connector of each detector to the detachable connector of the second connecting insulator of each detector, and supply power to multiple detectors through the power supply component.

[0087] After this step of connection is completed, as Figure 4 shown. The two conductive connectors are relatively parallel, and the circuits in the line selection system are all in normal operating states.

[0088] Step 803: Connect the second end of the first conductive connector of the first detector to the detachable connector of the second connecting insulator of the first detector.

[0089] When starting to detect the line selection function of the line selection system, select a single circuit where a switch cabinet is located, and switch the second end of the first conductive connector connected to the first connecting insulator in the first detector to be connected to the second connecting insulator.

[0090] Step 804: Connect the second end of the second conductive connector of the first detector to the detachable connector of the first connecting insulator of the first detector.

[0091] After switching the second conductive connector in this step, the two conductive connectors in the first detector are as Figure 5 shown. The two conductive connectors cross, and the current flows in the reverse direction, simulating a faulty circuit.

[0092] Step 805: Judge the line selection function of the line selection system: If the line selection system shows abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is normal; if the line selection system does not show abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is faulty.

[0093] When the current flows in the reverse direction, the small current grounding line selection device in the line selection system shows a sharp increase in the current value on this single circuit, and its current value is the sum of the current values of multiple other circuits. Therefore, it can be judged whether the line selection function of the line selection system is normal by whether the line selection system reads the abnormal current value of the current faulty circuit. If the line selection system does not show abnormal current, the line selection function of the line selection system is abnormal. Or when abnormal current is shown, but the abnormality appears in the circuit where the second detector is located, it is considered that the line selection is incorrect and the line selection function of the line selection system is abnormal.

[0094] Step 806: Connect the second end of the first conductive connector of the first detector to the detachable connector of the first connection insulator of the first detector.

[0095] After performing fault simulation and system line selection function judgment on the single loop where the first detector is located, restore the simulated faulty circuit to normal, that is, switch the two conductive connectors to be switched back to the connection state as Figure 4 shown.

[0096] Step 807: Connect the second end of the second conductive connector of the first detector to the detachable connector of the second connection insulator of the first detector.

[0097] After switching back to the normal connection state, the detection of the single loop where the first detector is located is all completed.

[0098] Step 808: Connect the second end of the first conductive connector of the second detector among multiple detectors to the detachable connector of the first connection insulator of the second detector.

[0099] There are multiple single loops in the full-loop line selection system of a substation. After detecting each single loop, obtain the overall line selection accuracy rate of the line selection system from the judgment of the fault state of each single loop by the line selection system. Therefore, after detecting the single loop where the first detector is located, detect another single loop where the second detector is located in the full loop. That is, switch the conductive connectors in the second detector.

[0100] Step 809: Connect the second end of the second conductive connector of the second detector to the detachable connector of the second connection insulator of the second detector.

[0101] After the second detector is switched, the connection of the two conductive connectors in the second detector is as Figure 5 shown, and the single loop where the second detector is located is in a faulty state.

[0102] Step 810: Judge the line selection function of the line selection system: If the line selection system shows abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the second detector is located is normal; if the line selection system does not show abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the second detector is located is faulty.

[0103] Repeat the judgment method of the line selection system in step 805 to obtain whether the fault judgment of the line selection system for the loop where the second detector is located is correct.

[0104] Repeat the above steps 801 - 810 to simulate the faulty circuits for each single circuit in the entire loop one by one, and obtain the judgment accuracy of the line selection system for each faulty loop, so as to obtain the accuracy rate of the line selection function of the line selection system. In the above detection method, power is supplied by the power supply device connected to the line selection system detection device, and there is no need to cut off the power supply for each single circuit for detection. Without power outage detection, it greatly facilitates the user's power consumption. At the same time, the entire detection process takes about half an hour, shortening the detection time and saving labor and detection costs.

[0105] In summary, the embodiment of the present application provides a method for detecting a line selection system for a line selection system detection device including multiple detectors, and the multiple detectors are connected in series through connection lines. Circuit switching can be performed between two connection insulators and two detection insulators in each detector through two conductive connectors. When a connection insulator and a detection insulator are connected respectively by switching the conductive connectors, the current flows in the reverse direction, and the circuit connected to this detector fails. At this time, if the line selection system shows an abnormal reading, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located is normal. If the line selection system does not show an abnormal reading, it indicates that the line selection function of the line selection system for the switch cabinet where this detector is located fails. And because the detector is connected to the power line, it is possible to detect whether the line selection function of the line selection system is normal without power outage. This solves the problem of the line selection function failure of the line selection system in the related art and improves the accuracy rate of the line selection function in the line selection system.

[0106] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A detection device for a line selection system, characterized in that, it includes a plurality of detectors installed in a plurality of switch cabinets, and the detectors include: a box body, two detection insulators, two connection insulators, two conductive connectors, a test wire, and two connection wires; One ends of the two detection insulators and the two connection insulators are installed on the inner wall of the box body; The first ends of the two conductive connectors are respectively movably connected to the other ends of the two detection insulators; The other end of the connection insulator is provided with a detachable connector, which is configured to form a detachable connection with the second end of the conductive connector; One end of the test wire is connected to one of the two detection insulators, and the other end passes through the zero-sequence current transformer in the switch cabinet and is connected to the other of the two detection insulators; One end of the connection wire is connected to the detachable connector on the connection insulator, and the other end is connected to the power line.

2. The detection device for a line selection system according to claim 1, characterized in that, the two conductive connectors include a metal strip and an insulating layer wrapped on the metal strip, and the end of the metal strip protrudes from the insulating layer.

3. The detection device for a line selection system according to claim 2, characterized in that, the conductive connector further includes a first connecting rod, one end of the metal strip has a through hole, and the first connecting rod passes through the through hole and is connected to the other end of the detection insulator.

4. The detection device for a line selection system according to claim 3, characterized in that, the other end of the metal strip has a notch, the detachable connector includes a second connecting rod, the second connecting rod is connected to the other end of the connection insulator, and when the metal strip rotates around the first connecting rod, the notch can be engaged with the second connecting rod.

5. The detection device for a line selection system according to claim 1, characterized in that, the lengths of the two connection insulators are different.

6. The detection device for a line selection system according to claim 1, characterized in that, the box body includes a box bottom, four box walls and a box cover, the box cover is movably connected to the box wall, and one ends of the two detection insulators and the two connection insulators are installed on the box bottom.

7. The detection device for a line selection system according to claim 1, characterized in that, the detection device for a line selection system further includes a power supply assembly; the power line is composed of the connection wires of the plurality of detectors and the power supply assembly, and the plurality of detectors and the power supply assembly are connected in series through the connection wires.

8. A method for detecting a line selection system, characterized in that, it is used for the detection device for a line selection system according to any one of claims 1-7 to detect a line selection system, and the detection device for a line selection system includes a plurality of detectors installed in a plurality of switch cabinets, and the method includes: Connect the second end of the first conductive connector among the two conductive connectors of the first detector among the plurality of detectors to the detachable connector of the first connection insulator among the two connection insulators of the first detector; Connect the second end of the second conductive connector among the two conductive connectors of the first detector to the detachable connector of the second connecting insulator among the two connecting insulators of the first detector; Supply power to the first detector through the two connecting wires of the first detector; Connect the second end of the first conductive connector of the first detector to the detachable connector of the second connecting insulator of the first detector; Connect the second end of the second conductive connector of the first detector to the detachable connector of the first connecting insulator of the first detector; If the line selection system shows abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is normal; If the line selection system does not show abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the first detector is located is faulty.

9. The method according to claim 8, wherein, the line selection system detection device further includes a power supply assembly, and the plurality of detectors and the power supply assembly are connected in series through connecting wires, The step of connecting the second end of the first conductive connector among the two conductive connectors of the first detector among the plurality of detectors to the detachable connector of the first connecting insulator among the two connecting insulators of the first detector includes: Connect the second end of the first conductive connector of each detector among the plurality of detectors to the detachable connector of the first connecting insulator of each detector; The step of connecting the second end of the second conductive connector among the two conductive connectors of the first detector to the detachable connector of the second connecting insulator among the two connecting insulators of the first detector includes: Connect the second end of the second conductive connector of each detector to the detachable connector of the second connecting insulator of each detector; The step of supplying power to the first detector through the two connecting wires of the first detector includes: Supply power to the plurality of detectors through the power supply assembly.

10. The method according to claim 9, wherein, After determining that the line selection function of the line selection system for the switch cabinet where the first detector is located is normal, the method further includes: Connect the second end of the first conductive connector of the first detector to the detachable connector of the first connecting insulator of the first detector; Connect the second end of the second conductive connector of the first detector to the detachable connector of the second connecting insulator of the first detector; Connect the second end of the first conductive connector of the second detector among the plurality of detectors to the detachable connector of the first connecting insulator of the second detector; Connect the second end of the second conductive connector of the second detector to the detachable connector of the second connecting insulator of the second detector; If the line selection system shows abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the second detector is located is normal; If the line selection system does not show abnormal readings, it is determined that the line selection function of the line selection system for the switch cabinet where the second detector is located is faulty.

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