Power-failure-free replacement device for 0.4 kV circuit breaker of power distribution network JP cabinet and box transformer substation

Abstract

The invention discloses a power-failure-free replacement device for a JP cabinet and a 0.4 kV circuit breaker of a box transformer substation of a power distribution network, and relates to the technical field of power system equipment maintenance. Comprising a JP cabinet, the JP cabinet is internally provided with an intelligent circuit breaker, cabinet bodies at two sides of the JP cabinet are respectively provided with a wire inlet side power supply socket and a wire outlet side power supply socket, and the power supply sockets are wired in the JP cabinet and are electrically connected with the intelligent circuit breaker; the device further comprises a drainage wire containing box, a drainage wire is contained in the drainage wire containing box, one end of the drainage wire is a power source plug male head capable of being connected with the power source plug female seat in an inserted mode, and the other end of the drainage wire can be electrically connected with a bypass cable or a main circuit cable. According to the power-failure-free replacement device for the JP cabinet and the 0.4 kV circuit breaker of the box transformer substation of the power distribution network, the JP cabinet and the 0.4 kV circuit breaker of the box transformer substation of the power distribution network can be safely and rapidly replaced without influencing power supply through technical means such as the drainage wire, the intelligent circuit breaker, the nuclear phase instrument and voltage and current monitoring, the power utilization stability of a user is guaranteed, and the power supply reliability of the power grid is improved; and the operation risk and the time cost in the maintenance process are obviously reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power system equipment maintenance, and in particular to a power-off-free replacement device for a JP cabinet and a box-type transformer 0.4kV circuit breaker of a distribution network. Background Art

[0002] As key protection devices, the 0.4kV circuit breakers in the JP cabinets and box transformers of the distribution network play an important role in the daily operation of the power grid. However, in the prior art, when the circuit breaker fails or requires maintenance, it is usually necessary to interrupt the power supply to ensure the safety of the operation. Especially in high-load areas or areas with important users (such as hospitals, factories, etc.), power outages not only bring inconvenience to users, but also may cause large economic losses and even cause the risk of equipment damage.

[0003] There are two main traditional ways to replace circuit breakers:

[0004] Planned power outage: The operation and maintenance unit plans the power outage time in advance, notifies users in specific areas, and arranges maintenance personnel to replace 0.4kV circuit breakers during the power outage. Although this method can ensure the safety of the operation, it often leads to large-scale power outages, affecting more users, and during the power outage, backup power supplies must be arranged to ensure power supply to important users, which increases maintenance costs.

[0005] Emergency repair method: When the circuit breaker suddenly trips or fails, the operation and maintenance personnel need to respond quickly and carry out emergency repairs in the event of a power outage. This method is likely to violate the ten prohibitions of Yunnan Power Grid Company's personal risk management and control, and there are certain safety risks in the repair process, especially when the operator rushes to work in an emergency situation, the safety protection measures are not implemented in place, which may cause safety hazards such as misoperation, short circuit and electric shock.

[0006] In the existing technology, only 10kV power maintenance equipment has introduced bypass technology, and some low-voltage lines use drainage lines or bypass devices to temporarily transfer loads, thereby maintaining power supply during circuit breaker maintenance. However, the use of these bypass devices still faces the following problems and limitations:

[0007] (1) Complex operation. Existing bypass equipment usually requires multiple operators to operate in coordination, and the installation and removal process of the drainage line is relatively complicated and time-consuming.

[0008] (2) There are many safety hazards. Under high load conditions, the bypass equipment may not be able to fully withstand the load current, causing the equipment to heat up or even short-circuit. In addition, nuclear phase inconsistency may also cause serious safety problems.

[0009] (3) The equipment is not portable. Existing bypass equipment is often large in size and heavy in weight, which makes it inconvenient to use in narrow or complex environments, limiting its application scenarios. Summary of the invention

[0010] The present invention aims to solve the problem that the JP cabinet and the 0.4kV circuit breaker of the distribution network need to be shut down during maintenance and replacement, and provide a technical device that can replace the circuit breaker without power outage. In the current background technology, the replacement of the circuit breaker usually requires the interruption of the power supply, which not only increases the risk of power outage for users and affects the stability of power supply, but also increases the operational risk and work intensity of maintenance personnel. Especially in high-load areas, frequent power outages may also cause equipment damage and economic losses.

[0011] Therefore, the present invention proposes a power-free replacement device for JP cabinets and 0.4kV box-type transformers in distribution networks. Through technical means such as drainage lines, intelligent circuit breakers, phase detectors, voltage and current monitoring, the JP cabinets and box-type transformers in distribution networks can be replaced safely and quickly without affecting the power supply, thereby ensuring the stability of power consumption for users, improving the power supply reliability of the power grid, and significantly reducing the operational risks and time costs during maintenance.

[0012] The technical solution adopted by the present invention is:

[0013] A power-free replacement device for a JP cabinet and a box-type transformer 0.4kV circuit breaker of a distribution network, comprising a JP cabinet, an intelligent circuit breaker installed in the JP cabinet, and an inlet-side power socket and an outlet-side power socket installed on both sides of the cabinet body of the JP cabinet, wherein the power socket is routed in the JP cabinet and electrically connected to the intelligent circuit breaker;

[0014] The power-free replacement device for the JP cabinet and 0.4kV circuit breaker of the distribution network also includes a drainage wire storage box, in which the drainage wire is stored. One end of the drainage wire is a male power plug that can be plugged into a female power socket, and the other end can be electrically connected to a bypass cable or a main circuit cable.

[0015] Furthermore, the front side of the JP cabinet is provided with a cabinet door that can be opened or closed, and an electrical partition is provided inside the cabinet, which divides the interior of the cabinet into a front cabinet and a rear cabinet; the intelligent circuit breaker is installed in the rear cabinet.

[0016] Furthermore, a voltage transmitter and a current transformer are installed in the rear cabinet of the JP cabinet, and the power sockets on the outlet sides of the voltage transmitter and the current transformer are electrically connected.

[0017] Furthermore, a closing and opening controller connected to the intelligent circuit breaker and a voltage and current display screen connected to the voltage transmitter and the current transformer are installed in the front cabinet of the JP cabinet.

[0018] Furthermore, there are four power sockets on the incoming line side and four power sockets on the outgoing line side; there are eight drainage wires in the drainage wire storage box; and there are four voltage transmitters and four current transformers.

[0019] Furthermore, the 0.4kV circuit breaker power-free replacement device also includes a phase check instrument and a phase check instrument operating lever.

[0020] Furthermore, a lighting lamp and a warning lamp are installed on the top outside the JP cabinet.

[0021] Furthermore, a torque caliper wrench is detachably mounted on the other end of the drainage line, and the torque caliper wrench includes an insulating outer sleeve and a transmission rod rotatably mounted in the insulating outer sleeve through a bearing;

[0022] The top of the transmission rod is rotatably mounted with an upper clamping block, and is threadedly connected with a lower clamping block, a hexagonal transmission sleeve is formed at its lower end, and a plug that matches the drainage line connection is rotatably mounted in the middle section;

[0023] The top of the insulating outer sleeve is provided with a wire clamp limit shell matching the upper clamp block and the lower clamp block, and the wire clamp limit shell is provided with an opening matching the cable entry, and the middle section is provided with a socket shell matching the plug;

[0024] The torque caliper wrench also includes a force-enhancing handle, on which a hexagonal plug capable of being inserted into the hexagonal transmission sleeve is provided.

[0025] A 0.4kV circuit breaker replacement method without power outage, the 0.4kV circuit breaker replacement method without power outage is based on the above-mentioned distribution network JP cabinet, box-type transformer 0.4kV circuit breaker replacement device without power outage, comprising the following steps: Step 1: Phase checking: Install the phase checking instrument on the operating lever of the phase checking instrument, and check the phases of the bypass cable and the main circuit cable one by one; Step 2: Install the bypass system: Connect the other end of the eight sets of drainage wires to the torque caliper wrench, and connect the male power plugs at one end of the eight sets of drainage wires to the female power plugs of the main circuit cables on the incoming and outgoing lines of the JP cabinet; Based on the phase verification results, connect the four sets of drainage wires on the incoming line side of the JP cabinet to the main circuit cables through the torque caliper wrench, and connect the four sets of drainage wires on the outgoing line side of the JP cabinet to the bypass cables through the torque caliper wrench; Step 3: Bypass power supply: Press the closing button of the intelligent circuit breaker through the closing and opening controller, and the drainage line starts to supply power to the transformer load; the voltage and current display screen displays the current and voltage status of the bypass system in real time; at the same time, turn on the warning light to indicate that the bypass system is working; Step 4: Replace the circuit breaker: Manually disconnect the intelligent circuit breaker in the JP cabinet and start to remove the incoming and outgoing wires of the intelligent circuit breaker; immediately install the insulating sheath after removing each phase line; after completing the removal of all phase lines and the installation of the sheath, replace the new intelligent circuit breaker; Step 5: Restore normal power supply: After installing the new intelligent circuit breaker, manually close the intelligent circuit breaker in the JP cabinet, and press the opening button of the bypass control box through the closing and opening controller to cut off the bypass power supply; after the current on the voltage and current display screen drops to zero, disconnect the intelligent circuit breaker and remove the bypass cable.

[0026] Beneficial effects:

[0027] The present invention successfully solves the technical problem that power outage is required during equipment maintenance or replacement of JP cabinets and box-type transformer 0.4kV circuit breakers in the distribution network by designing and implementing a 0.4kV circuit breaker replacement device without power outage, thus bringing significant social, economic and technical effects. The specific effects are analyzed as follows:

[0028] 1. Social Effect

[0029] Improve power supply reliability: The application of this device can avoid power outages when users replace or repair circuit breakers, truly realize "zero power outage perception" operation, and greatly improve power supply reliability and user satisfaction. Especially in civilian power-intensive areas and important power-using occasions (such as hospitals, schools, industrial parks, etc.), non-stop power supply operations can reduce user inconvenience and improve the quality of power grid services.

[0030] Ensure operational safety: Through technical measures such as bypass power supply, phase verification, and intelligent circuit breaker control, this device improves the safety of operators and avoids the risk of direct exposure to high-voltage environments during traditional replacement processes.

[0031] 2. Economic Effect

[0032] Reduce power outage losses: Traditional circuit breaker replacement operations require power outages, especially in high-load areas, which can cause economic losses and social impacts. Through the implementation of the present invention, operation and maintenance operations do not require power outages, which can reduce indirect economic losses caused by power outages and improve power grid operation efficiency.

[0033] Improve work efficiency and reduce operation and maintenance costs: The traditional process of replacing circuit breakers is complicated and time-consuming. After using this device, the equipment is light and easy to carry, and installation and disassembly are quick. The overall operation time is reduced by about 40%, and the labor intensity is greatly reduced. Since the device is reusable and has good durability and easy maintenance, it can reduce the operation and maintenance costs of the power grid in the long run.

[0034] 3. Technical Effect

[0035] Equipment replacement under continuous power supply: Through the coordinated work of core components such as intelligent circuit breakers, drainage lines, and phase analyzers, this device can complete the replacement of JP cabinets or box-type transformer 0.4kV circuit breakers without power outages, maintain continuous power supply to the distribution network, and ensure that the operation process is safe and controllable.

[0036] Real-time monitoring improves the ability to perceive equipment status: The real-time monitoring function of the voltage transmitter and current transformer ensures a clear understanding of the status of the bypass equipment during operation and avoids safety hazards caused by abnormal loads. This real-time monitoring function improves the ability to perceive the load and current status of the circuit breaker, which helps to better evaluate the operation of the power grid.

[0037] High operational flexibility: The device has strong flexibility and is suitable for both JP cabinets in distribution networks and replacement of 0.4kV circuit breakers in box-type transformers, adapting to operational requirements in different environments and conditions.

[0038] 4. Specific data

[0039] The operation time is shortened by 40%. By adopting the present invention, the time required for traditional operations can be shortened from about 120 minutes to about 70 minutes, and the operation efficiency is significantly improved.

[0040] The number of users without power is zero: With the application of this technology, the replacement of circuit breakers can achieve zero number of users without power, and the power supply stability and user satisfaction are significantly improved.

[0041] The equipment reuse rate is as high as over 90%: This device has high durability and high reuse rate, and can be widely used in many different scenarios, which extends the service life of the equipment and reduces the replacement cost of the equipment.

[0042] 5. Effects of technological innovation

[0043] Application of intelligent control technology: Through the integration of intelligent circuit breakers, the degree of automation is greatly improved, allowing operators to accurately and quickly control the opening and closing of circuits, improving the safety and accuracy of operations.

[0044] Lightweight design, enhanced portability: The lightness and ease of operation of the equipment make it more efficient to install and disassemble on site, especially in complex environments, the advantages of this device are more obvious.

[0045] In summary, the present invention shows significant technical effects in terms of replacing 0.4kV circuit breakers without power outages, improving the continuous power supply capacity of the power grid, reducing operation and maintenance costs, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0047] Figure 1It is a schematic diagram of the overall structure of the power distribution network JP cabinet and box-type transformer 0.4kV circuit breaker power-off-free replacement device of the present invention;

[0048] Figure 2 This is a schematic diagram of the connection between the drainage line and the JP cabinet of the present invention;

[0049] Figure 3 This is a schematic diagram of the installation position of the nuclear phase instrument of the present invention in the JP cabinet;

[0050] Figure 4 This is a schematic diagram of the installation positions of the intelligent circuit breaker, voltage transmitter and current transformer in the JP cabinet of the present invention;

[0051] Figure 5 It is a cross-sectional view of the JP cabinet of the present invention;

[0052] Figure 6 It is a schematic diagram of the overall structure of the torque caliper wrench of the present invention;

[0053] Figure 7 It is a structural cross-sectional view of the torque caliper wrench of the present invention;

[0054] Figure 8 It is a schematic diagram of the connection between the power-boosting handle and the transmission rod of the present invention;

[0055] In the figure, 1 is a JP cabinet; 2 is an intelligent circuit breaker; 3 is a female power socket; 4 is a drainage wire storage box; 5 is a drainage wire; 6 is a male power socket; 7 is an electrical partition; 8 is a voltage transmitter; 9 is a current transformer; 10 is a switch controller; 11 is a voltage and current display screen; 12 is a nuclear phase meter; 13 is a nuclear phase meter operating lever; 14 is a lighting lamp; 15 is a warning lamp; 16 is a torque caliper wrench; 17 is an insulating outer sleeve; 18 is a bearing; 19 is a transmission rod; 20 is an upper clamping block; 21 is a lower clamping block; 22 is a hexagonal transmission sleeve; 23 is a plug; 24 is a force-enhancing handle; 25 is a hexagonal plug. DETAILED DESCRIPTION

[0056] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0057] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features and technical solutions in the embodiments can be combined with each other without conflict. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0058] In view of the problem that the JP cabinets and 0.4kV box-type transformers of the distribution network require power outages during maintenance and replacement, in the current background technology, the replacement of circuit breakers usually requires interruption of power supply, which not only increases the risk of power outages for users and affects the stability of power supply, but also increases the operational risk and work intensity of maintenance personnel. Especially in high-load areas, frequent power outages may also cause equipment damage and economic losses. Therefore, this embodiment proposes a power-free replacement device for JP cabinets and 0.4kV box-type transformers of the distribution network. Through technical means such as drainage lines, intelligent circuit breakers, phase detectors, voltage and current monitoring, the JP cabinets and box-type transformers of the distribution network can be replaced safely and quickly without affecting the power supply, thereby ensuring the stability of users' electricity consumption, improving the power supply reliability of the power grid, and significantly reducing the operational risks and time costs during maintenance.

[0059] like Figure 1 As shown, the JP cabinet of the distribution network and the 0.4kV circuit breaker replacement device without power outage includes a JP cabinet 1, which is a rectangular cabinet. The front side of the cabinet of the JP cabinet 1 is provided with a cabinet door that can be opened or closed, and the cabinet door is preferably in an upward opening form; the cabinets on both sides of the JP cabinet 1 are installed with an inlet side power socket 3 and an outlet side power socket 3. Further, as a preferred technical solution of this embodiment, as Figure 1 As shown, a lighting lamp 14 and a warning lamp 15 are also installed on the top of the JP cabinet 1. The JP cabinet and the 0.4kV circuit breaker replacement device for the distribution network also includes a drain wire storage box 4, and the drain wire storage box 4 stores the drain wire 5. Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the JP cabinet 1 in this embodiment has an intelligent circuit breaker 2 installed therein, and the power socket 3 is routed inside the JP cabinet 1 and electrically connected to the intelligent circuit breaker 2. One end of the drainage line 5 is a power plug 6 that can be plugged into the power socket 3, and the other end thereof can be electrically connected to a bypass cable or a main circuit cable.

[0060] like Figure 5As shown, the JP cabinet 1 in this embodiment is provided with an electrical partition 7 inside, and the electrical partition 7 divides the cabinet into a front cabinet and a rear cabinet; the intelligent circuit breaker 2 is installed in the rear cabinet. At the same time, as a preferred technical solution of this embodiment, Figure 4 and Figure 5 As shown, in this embodiment, a voltage transmitter 8 and a current transformer 9 are installed in the rear cabinet of the JP cabinet 1, and the voltage transmitter 8 and the current transformer 9 are electrically connected to the power socket 3 on the outlet side. Figure 2 and Figure 3 As shown, the front cabinet of the JP cabinet 1 in this embodiment is equipped with a switch controller 10 connected to the intelligent circuit breaker 2, and a voltage and current display screen 11 connected to the voltage transmitter 8 and the current transformer 9. Among them, there are four power sockets 3 on the incoming line side and four power sockets 3 on the outgoing line side; there are eight drainage wires 5 in the drainage wire storage box 4; there are four voltage transmitters 8 and four current transformers 9. The voltage transmitter 8 is used to measure the voltage at both ends of the bypass device, and transmit the measurement results to the voltage and current display screen 11 for display; the current transformer 9 is used to measure the current in the bypass device, and transmit the measurement results to the voltage and current display screen 11 for display; the voltage transmitter 8 and the current transformer 9 are of great significance for monitoring the working state and load condition of the bypass device.

[0061] Furthermore, as a preferred technical solution of this embodiment, the 0.4kV circuit breaker power-free replacement device also includes a phase check instrument 12 and a phase check instrument operating lever 13. Figure 3 and Figure 4 As shown, the photo detector 12 and the photo detector operating rod 13 are installed on the cabinet door.

[0062] Furthermore, as a preferred technical solution of this embodiment, considering the stability and safety of the electrical connection between the drain wire 5 and the bypass cable or the main circuit cable, as Figures 1 to 5 As shown, in this embodiment, a torque caliper wrench 16 is detachably mounted on the other end of the drainage line 5. Figure 6 , Figure 7 and Figure 8 As shown, the torque caliper wrench 16 includes an insulating outer sleeve 17, and a transmission rod 19 rotatably installed in the insulating outer sleeve 17 through a bearing 18; wherein, an upper clamping block 20 is rotatably installed on the top of the transmission rod 19, and a lower clamping block 21 is threadedly connected, and a hexagonal transmission sleeve 22 is formed at its lower end, and a plug 23 connected to the drainage line 5 is rotatably sleeved in the middle section. A wire clamp limit shell matching the upper clamping block 20 and the lower clamping block 21 is provided at the top of the insulating outer sleeve 17, and an opening matching the cable entry is provided on the wire clamp limit shell, and a socket shell matching the plug 23 is provided in the middle section. The torque caliper wrench 16 also includes a force booster handle 24, and a hexagonal plug 25 capable of inserting the hexagonal transmission sleeve 22 is provided on the force booster handle 24.

[0063] The driving rod 19 can be quickly rotated by the booster handle 24. After the driving rod 19 rotates, the lower clamping block 21 is driven to move. Since the lower clamping block 21 is threadedly connected to the driving rod 19 and is limited by the wire clamp limit shell, the lower clamping block 21 cooperates with the upper clamping block 20 to clamp the cable at the opening of the wire clamp limit shell. After the cable is clamped, the upper clamping block 20, the lower clamping block 21, the driving rod 19, and the plug 23 form a conductor, so that the drainage line 5 can be inserted into the socket shell and contact the plug 23 for drainage.

[0064] JP cabinet 1: As the main part of the device, JP cabinet 1 integrates key components such as intelligent circuit breaker 2, drainage line 5, voltage transmitter 8, current transformer 9, nuclear phase instrument 12, electrical partition 7, lighting lamp 14 and warning lamp 15. The interior of JP cabinet 1 is divided into multiple modules, and the function of each module is clear, which not only ensures the safe operation of the equipment, but also facilitates the installation and maintenance of operators.

[0065] Intelligent circuit breaker 2: Intelligent circuit breaker 2 is used to control the opening and closing of bypass drainage line 5 to ensure that the bypass system can provide stable power supply during operation. Intelligent circuit breaker 2 can automatically monitor current and voltage, and automatically disconnect drainage line 5 when the bypass system is abnormal to avoid damage to power equipment or operators.

[0066] Drainage line 5: One end of the drainage line 5 is connected to the bypass cable or the main circuit cable through the torque caliper wrench 16, and the other end is connected to the inlet and outlet side of the JP cabinet 1 through the power plug male connector 6, which is used to divert the current from the main circuit to the bypass circuit. The drainage line 5 cooperates with the power plug female connector 3 on the inlet and outlet side of the JP cabinet 1 through the power plug female connector 3 to form a quick connection port structure, which is easy to install and remove and improves work efficiency.

[0067] Voltage transmitter 8 and current transformer 9: These electrical components are used to monitor the voltage and current in the bypass device in real time, and display the data through the voltage and current display screen 11 to ensure that the operator has a clear understanding of the working status of the system. The voltage and current data can also be used to detect whether the load exceeds the safety range, further ensuring the safety of the operation.

[0068] Phase checker 12: Phase checker 12 is used to detect the phase sequence of the bypass cable and the main circuit to ensure that the two phases are consistent. Phase checker 12 is hung on the inner side of the cabinet door of JP cabinet 1 for quick use during operation.

[0069] Electrical partition 7: The electrical partition 7 divides the interior of the cabinet into a front cabinet and a rear cabinet, isolating the electrical equipment from the outside world, and plays a role in dust and moisture protection. The electrical partition 7 is designed with embedded mounting holes for mounting the voltage and current display screen 11 to prevent the display screen from being damaged by the outside during operation.

[0070] Lighting light 14 and warning light 15: Lighting light 14 provides working illumination at night or in low light environment, while warning light 15 is used to indicate the current working status of the equipment. When the system is in bypass operation, warning light 15 lights up to remind the operator.

[0071] The power-free replacement device for the JP cabinet and 0.4kV box-type transformer of the distribution network temporarily takes over the transformer load through the introduction of the bypass circuit, thereby avoiding power outage of the main circuit during the circuit breaker replacement process. The intelligent circuit breaker 2, the phase detector 12 and the voltage and current monitoring device jointly ensure the safe operation of the bypass circuit and avoid accidents caused by phase sequence errors, current overloads, etc. Through scientific and reasonable equipment layout and electrical connection relationships, seamless switching between the bypass equipment and the main circuit is ensured, and circuit breaker replacement without power outage is realized.

[0072] Based on the above-mentioned distribution network JP cabinet and box-type transformer 0.4kV circuit breaker power-free replacement device, this embodiment also proposes a 0.4kV circuit breaker power-free replacement method, which includes the following steps: Step 1: Phase checking: Install the phase checking instrument on the operating lever of the phase checking instrument, and check the phases of the bypass cable and the main circuit cable one by one; Step 2: Install the bypass system: Connect the other end of the eight sets of drainage wires to the torque caliper wrench, and connect the male power plugs at one end of the eight sets of drainage wires to the female power plugs of the main circuit cables on the incoming and outgoing lines of the JP cabinet; Based on the phase verification results, connect the four sets of drainage wires on the incoming line side of the JP cabinet to the main circuit cables through the torque caliper wrench, and connect the four sets of drainage wires on the outgoing line side of the JP cabinet to the bypass cables through the torque caliper wrench; Step 3: Bypass power supply: Press the closing button of the intelligent circuit breaker through the closing and opening controller, and the drainage line starts to supply power to the transformer load; the voltage and current display screen displays the current and voltage status of the bypass system in real time; at the same time, turn on the warning light to indicate that the bypass system is working; Step 4: Replace the circuit breaker: Manually disconnect the intelligent circuit breaker in the JP cabinet and start to remove the incoming and outgoing wires of the intelligent circuit breaker; immediately install the insulating sheath after removing each phase line; after completing the removal of all phase lines and the installation of the sheath, replace the new intelligent circuit breaker; Step 5: Restore normal power supply: After installing the new intelligent circuit breaker, manually close the intelligent circuit breaker in the JP cabinet, and press the opening button of the bypass control box through the closing and opening controller to cut off the bypass power supply; after the current on the voltage and current display screen drops to zero, disconnect the intelligent circuit breaker and remove the bypass cable.

[0073] In summary, by introducing the bypass circuit and intelligent circuit breaker, the power outage problem during the replacement of the traditional 0.4kV circuit breaker is avoided, and the equipment maintenance and replacement can be completed without the user's awareness. Through the monitoring system of the voltage transmitter and current transformer, the load of the bypass system can be grasped in real time to ensure the stability and safety of the equipment operation. The design of the components such as the drainage line, torque caliper wrench is simple, which is convenient for quick connection and removal on site, greatly improving the work efficiency.

[0074] At the same time, it should be pointed out that the above description is only a typical embodiment of the present invention and does not limit the present invention in any form. Any changes made to the above embodiments based on the ideas and technical essence of the present invention are within the protection scope of the present invention.

Claims

1. A power-free replacement device for JP cabinets and box-type transformers in distribution networks, 0.4kV circuit breakers, characterized in that: The power distribution network JP cabinet and box-type transformer 0.4kV circuit breaker power-off-free replacement device comprises a JP cabinet, in which an intelligent circuit breaker is installed, and both sides of the JP cabinet are equipped with an incoming power socket and an outgoing power socket, and the power socket is wired in the JP cabinet and electrically connected to the intelligent circuit breaker; The power-free replacement device for the JP cabinet and 0.4kV circuit breaker of the distribution network also includes a drainage wire storage box, in which the drainage wire is stored. One end of the drainage wire is a male power plug that can be plugged into a female power socket, and the other end can be electrically connected to a bypass cable or a main circuit cable.

2. The power-free replacement device for JP cabinet and box-type transformer of distribution network 0.4kV circuit breaker according to claim 1 is characterized in that: The front side of the JP cabinet is provided with a cabinet door which can be opened or closed, and an electrical partition is provided inside the cabinet, which divides the cabinet into a front cabinet and a rear cabinet; the intelligent circuit breaker is installed in the rear cabinet.

3. The power-free replacement device for JP cabinet and box-type transformer of distribution network 0.4kV circuit breaker according to claim 2 is characterized in that: A voltage transmitter and a current transformer are also installed in the rear cabinet of the JP cabinet, and the voltage transmitter and the power socket on the outlet side of the current transformer are electrically connected.

4. The power-free replacement device for JP cabinet and box-type transformer of distribution network 0.4kV circuit breaker according to claim 3 is characterized in that: A switch-on / off controller connected to the intelligent circuit breaker and a voltage and current display screen connected to the voltage transmitter and the current transformer are installed in the front cabinet of the JP cabinet.

5. The power-free replacement device for JP cabinet and box-type transformer of distribution network 0.4kV circuit breaker according to claim 3 is characterized in that: There are four power sockets on the incoming line side and four power sockets on the outgoing line side; there are eight drainage wires in the drainage wire storage box; and there are four voltage transmitters and four current transformers.

6. The power-free replacement device for JP cabinet and box-type transformer of distribution network 0.4kV circuit breaker according to claim 1 is characterized in that: The 0.4kV circuit breaker power-off-free replacement device also includes a phase check instrument and a phase check instrument operating lever.

7. The power-free replacement device for JP cabinet and box-type transformer of distribution network 0.4kV circuit breaker according to claim 1 is characterized in that: A lighting lamp and a warning lamp are also installed on the top outside the JP cabinet.

8. The power-free replacement device for JP cabinet and box-type transformer of distribution network 0.4kV circuit breaker according to claim 1 is characterized in that: The other end of the drainage line is detachably mounted with a torque caliper wrench, the torque caliper wrench comprising an insulating outer sleeve and a transmission rod rotatably mounted in the insulating outer sleeve through a bearing; The top of the transmission rod is rotatably mounted with an upper clamping block, and is threadedly connected with a lower clamping block, a hexagonal transmission sleeve is formed at its lower end, and a plug that matches the drainage line connection is rotatably mounted in the middle section; The top of the insulating outer sleeve is provided with a wire clamp limit shell matching the upper clamp block and the lower clamp block, and the wire clamp limit shell is provided with an opening matching the cable entry, and the middle section is provided with a socket shell matching the plug; The torque caliper wrench also includes a force-enhancing handle, on which a hexagonal plug capable of being inserted into the hexagonal transmission sleeve is provided.

9. A method for replacing a 0.4kV circuit breaker without power outage, the method for replacing a 0.4kV circuit breaker without power outage is based on the device for replacing a 0.4kV circuit breaker without power outage for a JP cabinet or a box-type transformer in a distribution network according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Phase checking: Install the phase checking instrument on the operating lever of the phase checking instrument, and check the phases of the bypass cable and the main circuit cable one by one; Step 2: Install the bypass system: Connect the other end of the eight sets of drainage wires to the torque caliper wrench, and connect the male power plugs at one end of the eight sets of drainage wires to the female power plugs of the main circuit cables on the incoming and outgoing lines of the JP cabinet; Based on the phase verification results, connect the four sets of drainage wires on the incoming line side of the JP cabinet to the main circuit cables through the torque caliper wrench, and connect the four sets of drainage wires on the outgoing line side of the JP cabinet to the bypass cables through the torque caliper wrench; Step 3: Bypass power supply: Press the closing button of the intelligent circuit breaker through the closing and opening controller, and the drainage line starts to supply power to the transformer load; the voltage and current display screen displays the current and voltage status of the bypass system in real time; at the same time, turn on the warning light to indicate that the bypass system is working; Step 4: Replace the circuit breaker: Manually disconnect the intelligent circuit breaker in the JP cabinet and start to remove the incoming and outgoing wires of the intelligent circuit breaker; immediately install the insulating sheath after removing each phase line; after completing the removal of all phase lines and the installation of the sheath, replace the new intelligent circuit breaker; Step 5: Restore normal power supply: After installing the new intelligent circuit breaker, manually close the intelligent circuit breaker in the JP cabinet, and press the opening button of the bypass control box through the closing and opening controller to cut off the bypass power supply; after the current on the voltage and current display screen drops to zero, disconnect the intelligent circuit breaker and remove the drainage line connected to the bypass cable.

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