Method for transferring live load of bus and switch bypass of 35kv substation

Abstract

This invention relates to a method for transferring energized loads on the busbars and switch bypasses of a 35kV substation, comprising the following steps: S1: Providing a 35kV bypass work platform (vehicle) equipped with a "one-in, three-out" incoming and outgoing line system, including one PT cabinet H1, one 35kV incoming cabinet H2, two 35kV outgoing cabinets H3 and H4, one substation transformer cabinet H5, and one bypass outgoing cabinet H6; S2: Using an electric cable lifter, the 35kV incoming cable is lifted to the position of the overhead conductor. The operator uses an insulated operating rod to energize the three-phase incoming line clamps of the platform (vehicle) and connect them to the three-phase conductors of the overhead line; S3: The operator energizes the three-phase outgoing lines of the platform (vehicle) and connects them to the transformer incoming terminal or busbar connected to the busbar to be repaired. This invention solves the technical problem that existing 35kV substation busbar and switch maintenance requires power outage, enabling uninterrupted operation and improving power supply reliability.

Description

Technical Field

[0001] This invention relates to the field of power maintenance technology, specifically a method for transferring live loads on the busbar and switch bypass of a 35KV substation. Background Technology

[0002] The current 35kV power grid was built relatively early, resulting in outdated equipment and frequent faults. The 35kV power grid has extremely weak interoperability, making it very difficult to replace, repair, or perform pre-testing of high-voltage equipment within substations. If on-site power outages are required for the construction, maintenance, or pre-testing of major equipment in a 35kV substation, the impact will be widespread and the losses from power outages will be substantial.

[0003] Currently, live-line maintenance of 35kV substations is still in the early stages of research, and the technology for 35kV bypass live-line work has not yet been systematically researched and applied.

[0004] National standard GB / T 34577-2017, "Technical Guidelines for Bypass Operations on Distribution Lines," specifies the technical requirements, operating methods, and safety measures for bypass operations on distribution lines with voltage levels of 10kV to 20kV. However, this standard has the following limitations: (1) Voltage level limitation: This standard only applies to 10kV~20kV distribution lines, and there are no relevant provisions for 35kV voltage level. The technical parameters of 35kV system, such as insulation level, safety distance, power frequency withstand voltage (95kV / 1min vs 45kV / 1min), are significantly different from those of 10kV system and cannot be simply applied.

[0005] (2) Limitations of the scope of work: This standard mainly targets bypass maintenance of power distribution lines (overhead conductors, cable lines, pole-mounted transformers), and does not cover bypass live-line work on auxiliary equipment such as busbars, switches, and PTs inside substations. As the "main artery" of a substation, the maintenance of busbars usually requires a complete power outage of the entire station, and this standard does not provide corresponding technical solutions.

[0006] (3) System configuration limitations: The bypass system in this standard is mainly "one in and one out" or "one in and two out", which cannot meet the complex bypass requirements of multiple outgoing lines in the substation (such as two transformers supplying power at the same time, PT access, etc.).

[0007] Therefore, there is an urgent need to develop a bypass live-line working technology and specialized equipment that can complete the load transfer of 35kV substations and achieve uninterrupted replacement of busbars and switches. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a method for transferring energized loads on 35kV substation busbars and switch bypasses, solving the technical problem that existing 35kV substation busbar and switch maintenance requires power outages, enabling live-line work and improving power supply reliability. The invention's "one-in, three-out" system configuration, electric cable lifter, and high-current drain clamp work together to form a complete 35kV bypass live-line work technology system.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a method for transferring energized loads on the busbar and switch bypass of a 35kV substation, comprising the following steps: S1: Provide a 35kV bypass operation platform (vehicle). The platform (vehicle) is equipped with a "one inlet and three outlet" inlet and outlet system, including 1 PT cabinet H1, 1 35kV inlet cabinet H2, 2 35kV outlet cabinets H3 and H4, 1 station transformer cabinet H5 and 1 bypass outlet cabinet H6. S2: Using an electric cable hoist, the 35kV incoming cable is lifted to the position of the overhead conductor. The operator uses an insulated operating rod to connect the three-phase incoming line clamps of the platform (vehicle) to the three-phase conductors of the overhead line while they are energized. S3: The operator will connect the three-phase outgoing lines of the platform (vehicle) to the transformer inlet or busbar connected to the busbar to be repaired while the platform (vehicle) is energized. S4: Automatic phase verification is performed on both sides of each incoming and outgoing line switch on the platform (vehicle). After confirming that the phase sequence is correct, the relevant switches are closed to put the bypass system into operation and transfer the load of the bus and switches to the platform (vehicle). S5: Disconnect the incoming and outgoing disconnect switches of the busbar to be inspected, so that the busbar is de-energized and taken out of operation, and carry out the inspection or replacement of the busbar or switch. S6: After maintenance is completed, close the incoming and outgoing disconnect switches of the busbar to restore the busbar to operation. Then disconnect the high-voltage switch of the platform (vehicle), remove the incoming and outgoing cable terminals, and take the platform (vehicle) out of operation.

[0010] Furthermore, through the above technical solution, the incoming cable is selected as a flexible copper cable with a cross-section of 70mm², 95mm², or 120mm², and the incoming load current is less than the rated current of the bypass system; the rated current carrying capacity of the drain clamp is not less than 400A.

[0011] Furthermore, in step S4, automatic phase comparison is achieved by an automatic phase comparator configured on both sides of the switch in each cabinet. The phase comparator collects information from the current transformers at the bottom of the incoming cabinet H2 and the outgoing cabinets H3, H4, and H6.

[0012] As a preferred technical solution, the "one-in-three-out" 35kV bypass operation platform (vehicle) includes a modular enclosure, which integrates an SF6 ring main unit system. The SF6 ring main unit system specifically includes: 1 PT cabinet H1, 1 35kV incoming line cabinet H2, 2 35kV outgoing line cabinets H3 and H4, 1 station transformer cabinet H5, and 1 bypass outgoing line cabinet H6, for a total of 6 sets; Among them, the 35kV incoming line cabinet H2 is equipped with a dedicated electricity meter; and each cabinet is equipped with an automatic phase comparator on both sides of the switch. The platform (vehicle) is also equipped with a protection screen to provide overcurrent and instantaneous overcurrent protection.

[0013] Furthermore, the 35kV incoming line cabinet H2, the 35kV outgoing line cabinets H3 and H4, and the bypass outgoing line cabinet H6 all use 35kV cable quick-connect connectors as the lead-out method to achieve quick plug-in connection; the quick-connect connectors have a self-locking mechanism, which automatically locks when the plug is inserted into the socket, and can only be separated by manually pressing the unlock button.

[0014] As a preferred technical solution, the station transformer cabinet H5 is equipped with a 50kVA station service transformer to provide self-powered power to the integrated compartment of the platform (vehicle), and is also equipped with a three-phase 380V backup power interface.

[0015] Furthermore, the container-type enclosure has an IP65 protection rating, providing rain and dust protection; the enclosure installation area is equipped with shock-absorbing measures; the enclosure is made of lightweight metal composite board material with a total thickness of 1.5mm and a weight of 5.8kg / m².

[0016] Compared with the prior art, the present invention provides a method for transferring live loads on the busbar and switch bypass of a 35kV substation, which has the following advantages: 1. This invention utilizes a "one-in, three-out" 35kV mobile high-voltage power supply compartment and a bypass live load transfer method to transfer the load of the busbar and switch to the high-voltage power supply compartment while maintaining power supply to the equipment under maintenance, allowing it to be de-energized and taken out of operation under zero load. Compared to existing technologies where 35kV substation equipment maintenance requires power outages, has a wide impact range, and incurs significant power outage losses, this invention achieves zero-perception busbar / switch maintenance for users, greatly improving power supply reliability.

[0017] 2. This invention uses SF6 ring main units to form a "one-in, three-out" system (1 PT cabinet H1, 1 35kV incoming cabinet H2, 2 35kV outgoing cabinets H3 and H4, 1 substation transformer cabinet H5, and 1 bypass outgoing cabinet H6). Compared with the "one-in, one-out" or "one-in, two-out" configuration of the bypass operation system in the prior art, this invention provides 3 outgoing line capabilities, which can simultaneously meet multiple bypass requirements such as transformer bus access, second transformer access, and PT access. It has stronger applicability and fills the gap in the 35kV voltage level and substation equipment bypass operation in the GB / T 34577-2017 standard.

[0018] 3. This invention integrates functional modules such as the SF6 ring main unit system, transformer, protection panel, DC power supply panel, and station self-powered system into a modular enclosure. A 50kVA station transformer provides self-power for the entire enclosure, and a three-phase 380V backup power interface is also provided. Compared to existing bypass solutions that rely on external auxiliary equipment, this invention enables completely independent operation of the bypass work platform (vehicle), reducing dependence on external equipment and adapting to complex field conditions.

[0019] 4. This invention uses 35kV cable quick-connect connectors as the lead-out method for all incoming and outgoing line cabinets. The quick-connect connectors have a self-locking mechanism (automatically locking when the plug is inserted into the socket, and need to be manually pressed to unlock the connection), realizing quick plug-in connection.

[0020] 5. This invention is specifically designed for 35kV voltage levels: the container-type enclosure has an IP65 protection rating, providing rain and dust protection; shockproof measures are installed at the cabinet mounting points; the enclosure is made of lightweight metal composite board material; a protection panel is configured to provide overcurrent and instantaneous overcurrent protection; a DC power supply panel is configured to provide a stable DC power supply for the protection and operating system; automatic phase comparators are installed on both sides of each cabinet switch to ensure that the phase sequence is correct before closing the circuit. All design features meet the safety requirements for 35kV live-line work.

[0021] 6. The national standard GB / T 34577-2017, "Technical Guidelines for Bypass Operations on Distribution Lines," applies only to voltage levels of 10kV to 20kV, and has no relevant provisions for 35kV voltage levels. This invention is the first to systematically propose a mobile high-voltage power supply compartment and its bypass live load transfer method for 35kV voltage levels, providing a complete technical solution and equipment support for uninterrupted maintenance operations in 35kV substations, and promoting the development of 35kV bypass live-line operation technology. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main wiring of cabinets H1 to H6 of the present invention; Figure 2 This is a schematic diagram of the load transfer method. Figure 3 This is a schematic diagram of the interior of the container-type box of the present invention; Figure 4 This is a side view of the container-type box of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example Please see Figure 1-4 This invention provides the following technical solution: a method for transferring live loads on the busbar and switch bypass of a 35KV substation, comprising the following steps: S1: Provide a 35kV bypass operation platform (vehicle). The platform (vehicle) is equipped with a "one inlet and three outlet" inlet and outlet system, including 1 PT cabinet H1, 1 35kV inlet cabinet H2, 2 35kV outlet cabinets H3 and H4, 1 station transformer cabinet H5 and 1 bypass outlet cabinet H6. S2: Using an electric cable hoist, the 35kV incoming cable is lifted to the position of the overhead conductor. The operator uses an insulated operating rod to connect the three-phase incoming line clamps of the platform (vehicle) to the three-phase conductors of the overhead line while they are energized. S3: The operator will connect the three-phase outgoing lines of the platform (vehicle) to the transformer inlet or busbar connected to the busbar to be repaired while the platform (vehicle) is energized. S4: Automatic phase verification is performed on both sides of each incoming and outgoing line switch on the platform (vehicle). After confirming that the phase sequence is correct, the relevant switches are closed to put the bypass system into operation and transfer the load of the bus and switches to the platform (vehicle). S5: Disconnect the incoming and outgoing disconnect switches of the busbar to be inspected, so that the busbar is de-energized and taken out of operation, and carry out the inspection or replacement of the busbar or switch. S6: After maintenance is completed, close the incoming and outgoing disconnect switches of the busbar to restore the busbar to operation. Then disconnect the high-voltage switch of the platform (vehicle), remove the incoming and outgoing cable terminals, and take the platform (vehicle) out of operation.

[0025] Based on the above, the present invention provides a 35kV bypass operation platform (vehicle) equipped with a "one-in, three-out" incoming and outgoing line system (including one PT cabinet H1, one 35kV incoming cabinet H2, two 35kV outgoing cabinets H3 and H4, one station transformer cabinet H5, and one bypass outgoing cabinet H6). First, an electric cable lifter is used to lift the 35kV incoming cable to the position of the overhead conductor. Then, the operator uses an insulated operating rod to energize the three-phase incoming line clamps and connect them to the three-phase conductors of the overhead line. Finally, the three-phase outgoing lines are energized and connected to the transformer connected to the busbar to be repaired. The process begins with the incoming line or busbar. Next, automatic phase verification is performed on both sides of each incoming and outgoing switch. After confirming the correct phase sequence, the relevant switches are closed to activate the bypass system, transferring the load of the busbar and switches to the platform (vehicle). Then, the incoming and outgoing disconnect switches of the busbar to be inspected are disconnected, de-energizing the busbar and removing it from operation for inspection or replacement. Finally, after the inspection is completed, the incoming and outgoing disconnect switches of the busbar are closed to restore busbar operation. The high-voltage switch of the platform (vehicle) is then disconnected, the incoming and outgoing cable terminals are removed, and the platform (vehicle) is taken out of operation. This method effectively solves the technical problem of requiring power outages for busbar and switch maintenance in existing 35kV substations, achieving zero-perception, uninterrupted power supply operation for users, greatly improving power supply reliability, and filling the technical gap in the GB / T 34577-2017 standard for bypass operations at 35kV voltage levels and within substations.

[0026] To meet the specific requirements of the 35kV voltage level, special requirements are placed on the bypass cable and current-carrying clamps to achieve an optimal balance between current-carrying capacity and operational flexibility. The incoming cable is a flexible copper cable with a cross-section of 70mm², 95mm², or 120mm², and the incoming load current is less than the rated current of the bypass system. The main transformer of the 35kV substation (e.g., SFZ20000 / 35 / 10.5) can operate at a current of 360-400A when the load exceeds 70%. Calculations show that the current-carrying capacity of a single flexible copper core cable is directly proportional to its cross-section. A cross-section that is too small (e.g., 50mm²) cannot meet the current-carrying requirements, while a cross-section that is too large (e.g., 150mm² or more) results in excessive cable weight (>4kg / m) and a large bending radius (>12 times the outer diameter), making on-site laying and live-line work inconvenient. Therefore, this invention selects three cross-sectional grades of 70mm², 95mm², and 120mm² to achieve the optimal balance between current carrying capacity and operational flexibility. The rated current carrying capacity of the current-carrying clamp is not less than 400A. As the only separable connection point in the bypass system, the contact resistance and current carrying capacity of the clamp directly affect the system safety. Clamps with a current carrying capacity of less than 400A will have a temperature rise of more than 55K under full load conditions, posing a risk of overheating and burnout. Therefore, this invention limits the rated current carrying capacity of the clamp to not less than 400A to ensure safe operation even under full load or short-term overload conditions of the transformer.

[0027] As described above, in order to ensure that the phase sequence between each cabinet is consistent and to prevent short circuits, in step S4, automatic phase verification is achieved by an automatic phase comparator configured on both sides of the switch in each cabinet. The phase comparator collects information from the current transformers at the bottom of the incoming cabinet H2 and the outgoing cabinets H3, H4, and H6. This automatically detects whether the phase sequence and phase of the two power supplies are consistent before closing the circuit. Only when it is confirmed to be correct is closing the circuit allowed, thus preventing short circuits from occurring at the source.

[0028] See Figure 1 , Figure 3 , Figure 4 The "one-in-three-out" 35kV bypass operation platform (vehicle) includes a modular enclosure, which integrates an SF6 ring network cabinet system. The SF6 ring main unit system specifically includes: 1 PT cabinet H1, 1 35kV incoming line cabinet H2, 2 35kV outgoing line cabinets H3 and H4, 1 station transformer cabinet H5, and 1 bypass outgoing line cabinet H6, for a total of 6 sets; Among them, the 35kV incoming line cabinet H2 is equipped with a dedicated electricity meter; and each cabinet is equipped with an automatic phase comparator on both sides of the switch. The platform (vehicle) is also equipped with a protection screen to provide overcurrent and instantaneous overcurrent protection. Based on the above, by using the provided "one-in-three-out" 35kV bypass operation platform (vehicle), six sets of SF6 ring network cabinets (including one PT cabinet H1, one 35kV incoming cabinet H2, two 35kV outgoing cabinets H3 and H4, one station transformer cabinet H5, and one bypass outgoing cabinet H6) are integrated into a container-type enclosure. A dedicated electricity meter is installed in the 35kV incoming cabinet H2, automatic phase comparators are configured on both sides of the switches in each cabinet, and a protection panel is configured to realize overcurrent and instantaneous overcurrent protection functions. Thus, a highly integrated and fully functional mobile bypass power supply system is constructed. This platform vehicle effectively solves the technical problems of insufficient outgoing line capacity of existing 35kV bypass equipment (only one inlet and one outlet or one inlet and two outlets), inability to count bypass power, low efficiency and error-proneness of phase verification relying on manual operation, lack of overcurrent protection, and reliance on external power supply. It achieves the technical effects of three outgoing lines that can simultaneously bypass multiple devices, meterable and traceable bypass power supply, automatic phase verification and switch interlocking to ensure closed-loop safety, rapid isolation in case of fault, and independent operation of station service transformers powered by their own power supply. It provides a safe, efficient, and traceable mobile bypass power supply guarantee for uninterrupted maintenance of 35kV substation busbars and switches.

[0029] As described above, the dedicated electricity meter (located in the H2 incoming line cabinet) is primarily used to accurately record parameters such as active / reactive power, voltage, current, and power factor during bypass power supply. This solves the problem of "no recording and difficult settlement" in traditional bypass operations, upgrading bypass power supply from a temporary emergency to a standardized operation that is measurable, traceable, and accountable. The protection panel, by integrating overcurrent protection and instantaneous overcurrent protection functions, delays tripping to prevent equipment overheating and damage during load overload, and instantly (≤40ms) tripping to quickly isolate faults during short-circuit faults. This solves the problem of traditional bypass equipment operating "naked" and faults not being automatically isolated, which can easily lead to the expansion of accidents. The two work together, with the electricity meter solving the "economic accounting" problem and the protection panel solving the "operational safety" problem. Together, they upgrade the bypass operation platform from a simple "temporary bypass tool" to a standardized, safe, and manageable mobile power system, providing complete metering and safety assurance for uninterrupted maintenance of 35kV substation busbars and switches.

[0030] To address the technical problems of traditional cable connection methods, such as long connection time, easy detachment due to vibration, loosening due to vibration, and non-reusability, the 35kV incoming line cabinet H2, 35kV outgoing line cabinets H3 and H4, and bypass outgoing line cabinet H6 all adopt 35kV cable quick-connect connectors as the lead-out method to achieve quick plug-in connection; the quick-connect connector has a self-locking mechanism, which automatically locks when the plug is inserted into the socket, and can only be separated by manually pressing the unlock button.

[0031] To address the technical issues of poor mobility, slow deployment, and low reliability caused by traditional bypass equipment relying on external power sources (station power or generators), the H5 substation transformer cabinet is equipped with a 50kVA station power transformer to provide self-powered power to the integrated compartment of the platform (vehicle). It is also equipped with a three-phase 380V backup power interface. The 50kVA capacity selection is the optimal choice based on comprehensive factors such as the platform vehicle's internal load, impact load bearing capacity, size and weight limitations, and the availability of standard specifications. At the same time, the configured three-phase 380V backup power interface provides redundancy protection in case of substation transformer failure or maintenance, ensuring that bypass operations are not interrupted due to power supply problems.

[0032] The modular enclosure boasts an IP65 protection rating, providing rain and dust protection. Shock-resistant measures are incorporated at the enclosure's mounting points. The enclosure utilizes lightweight metal composite panels with a total thickness of 1.5mm and a weight of 5.8kg / m². By upgrading the enclosure's protection rating to IP65, the problems of insufficient waterproofing and dustproofing capabilities and susceptibility to moisture damage to internal equipment under harsh weather conditions such as rain, snow, and sandstorms are effectively addressed. Shock-resistant measures at the enclosure's mounting points resolve issues of equipment loosening, wiring detachment, and unreliable electrical connections caused by vibrations during vehicle transport and on-site operations. The use of lightweight metal composite panels with a total thickness of only 1.5mm and a weight of only 5.8kg / m² overcomes the problems of excessive weight in traditional steel enclosures leading to vehicle overloading and poor maneuverability. These three features combined enable the bypass operation platform (vehicle) to achieve all-weather operation capabilities, reliable vehicle-mounted shock resistance, and lightweight transport characteristics, meeting the safety, reliability, and mobility requirements of 35kV substations in complex field conditions.

[0033] It should also be noted that, regarding the appendix Figure 1 The requirements are as follows: The 1.35kV high-voltage switchgear consists of one PT switchgear H1, one 35kV incoming switchgear H2, two 35kV outgoing switchgears H3 and H4, one substation switchgear H5, and one bypass outgoing switchgear H6, forming a complete SF6 ring main unit. The two incoming switchgears include dedicated electricity meters. The switchgear is installed in a container or truck and moved with the vehicle, forming a 35kV mobile vehicle-mounted high-voltage power supply compartment. Anti-vibration measures should be taken. The switchgear is equipped with pluggable cable terminals, and the incoming cables and accessories are configured according to the diagram. 2. High and low voltage side microprocessor protection requires separate panel configurations. Cabinets H2, H3, H4, and H5 use quick-connect and drop-out wiring methods for incoming and outgoing lines. 3. The primary and secondary wiring between the high-voltage cabinet inside the transformer and one set of protection panel, one set of DC panel, and one set of control cabinet must be completed and tested.

[0034] 4. The phase comparator performs phase comparison on the 35kV side of the power supply compartment, collecting data on the lower positions of the circuit breaker incoming cabinet H2 and the circuit breaker outgoing cabinets H3, H4, and H5. (Attached) Figure 4 The circled area. Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

A method for transferring energized loads on the busbar and switch bypass of a 1.35kV substation, characterized in that: Includes the following steps: S1: Provide a 35kV bypass operation platform (vehicle). The platform (vehicle) is equipped with a "one inlet and three outlet" inlet and outlet system, including 1 PT cabinet H1, 1 35kV inlet cabinet H2, 2 35kV outlet cabinets H3 and H4, 1 station transformer cabinet H5 and 1 bypass outlet cabinet H6. S2: Using an electric cable hoist, the 35kV incoming cable is lifted to the position of the overhead conductor. The operator uses an insulated operating rod to connect the three-phase incoming line clamps of the platform (vehicle) to the three-phase conductors of the overhead line while they are energized. S3: The operator will connect the three-phase outgoing lines of the platform (vehicle) to the transformer inlet or busbar connected to the busbar to be repaired while the platform (vehicle) is energized. S4: Automatic phase verification is performed on both sides of each incoming and outgoing line switch on the platform (vehicle). After confirming that the phase sequence is correct, the relevant switches are closed to put the bypass system into operation and transfer the load of the bus and switches to the platform (vehicle). S5: Disconnect the incoming and outgoing disconnect switches of the busbar to be inspected, so that the busbar is de-energized and taken out of operation, and carry out the inspection or replacement of the busbar or switch. S6: After maintenance is completed, close the incoming and outgoing disconnect switches of the busbar to restore the busbar to operation. Then disconnect the high-voltage switch of the platform (vehicle), remove the incoming and outgoing cable terminals, and take the platform (vehicle) out of operation.

2. The method for transferring live loads on the 35kV substation busbar and switch bypass according to claim 1, characterized in that: The incoming cable is a flexible copper cable with a cross-section of 70mm², 95mm², or 120mm², and the incoming load current is less than the rated current of the bypass system; the rated current carrying capacity of the drain clamp is not less than 400A.

3. The method for transferring live loads on the 35kV substation busbar and switch bypass according to claim 1, characterized in that: In step S4, automatic phase comparison is achieved by an automatic phase comparison instrument configured on both sides of the switch in each cabinet. The phase comparison instrument collects information from the current transformers at the bottom of the incoming cabinet H2 and the outgoing cabinets H3, H4, and H6.

4. A "one-in-three-out" 35kV bypass operation platform (vehicle) for implementing the method described in any one of claims 1 to 3, characterized in that: It includes a modular container, which integrates an SF6 ring network cabinet system. The SF6 ring main unit system specifically includes: 1 PT cabinet H1, 1 35kV incoming line cabinet H2, 2 35kV outgoing line cabinets H3 and H4, 1 station transformer cabinet H5, and 1 bypass outgoing line cabinet H6, for a total of 6 sets; Among them, the 35kV incoming line cabinet H2 is equipped with a dedicated electricity meter; and each cabinet is equipped with an automatic phase comparator on both sides of the switch. The platform (vehicle) is also equipped with a protection screen to provide overcurrent and instantaneous overcurrent protection.

5. The 35kV bypass operation platform (vehicle) according to claim 4, characterized in that: The 35kV incoming line cabinet H2, 35kV outgoing line cabinets H3 and H4, and bypass outgoing line cabinet H6 all use 35kV cable quick-connect connectors as the lead-out method to achieve quick plug-in connection; the quick-connect connector has a self-locking mechanism, which automatically locks when the plug is inserted into the socket, and can only be separated by manually pressing the unlock button.

6. The 35kV bypass operation platform (vehicle) according to claim 4, characterized in that: The station transformer cabinet H5 is equipped with a 50kVA station service transformer to provide self-powered power to the integrated compartment of the platform (vehicle), and is also equipped with a three-phase 380V backup power interface.

7. The 35kV bypass operation platform (vehicle) according to claim 4, characterized in that: The container-type enclosure has an IP65 protection rating and is rainproof and dustproof; the installation area of ​​the enclosure is equipped with shockproof measures; the enclosure is made of lightweight metal composite board material with a total thickness of 1.5mm and a weight of 5.8kg / m².

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