A towed live load transfer device and method of use thereof

Abstract

The present application relates to the technical field of power system, specifically relates to a kind of towed live load transfer device and its use method, device includes towed chassis, shelter, cable take-up mechanism, bypass load switch and bypass system test test platform, cable take-up mechanism is set in the shelter inside;Bypass load switch is in series between first bypass cable and second bypass cable;Bypass system test test platform includes insulation resistance tester and conduction test indicator, bypass detection test platform is used to carry out electrical integrity test to bypass circuit;The present application is integrated by bypass load switch, cable take-up mechanism and bypass system test test platform and other components, reduces the construction time of field equipment before bypass operation, predicts the remaining useful life of key insulation components, and updates combined with use record, to avoid failure in the use process bypass cable or switch joint and so on position.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a towed live load transfer device and a use method thereof. BACKGROUND

[0002] In the daily operation and maintenance of power transmission and distribution networks, it is often necessary to perform scheduled maintenance, upgrade or fault repair on key components such as lines, switchgear and transformers. In order to ensure that users can continuously obtain power supply during these operations and avoid the social and economic impact of large-scale or long-term power outages, bypass operation technology is usually used, i.e. by using temporary power supply lines and switchgear, the part of the power system that needs to be operated is temporarily isolated, and the downstream load is supplied by the bypass system.

[0003] Currently, the common way to implement bypass power supply is to temporarily set up a bypass system at the operation site, which usually involves transporting scattered bypass cables, bypass switches, support structures and other equipment to the site for manual assembly and wiring. Although this method is flexible, it faces challenges in terms of deployment efficiency, standardization of equipment management, and safety risk control during operation.

[0004] In order to improve the efficiency and convenience of bypass operation, some mobile bypass power supply equipment has also appeared. However, the existing mobile bypass equipment has single function, lacks integrated design, and needs to purchase special vehicles, and the maintenance is complex. SUMMARY

[0005] The present application solves the problem of the lack of electrical integrity testing, evaluation of the insulation state of the equipment itself, etc. in the existing mobile bypass system, and aims to provide a towed live load transfer device and a use method thereof, which further improves the efficiency of bypass operation, enhances the system integration and intelligence, improves safety assurance, and can effectively evaluate and manage the state of the bypass equipment itself.

[0006] The present application is implemented by the following technical solutions:

[0007] A towed live load transfer device, comprising:

[0008] a towed chassis;

[0009] a shelter arranged on the towed chassis;

[0010] at least one cable winding and unwinding mechanism, arranged inside the shelter, and used for winding and unwinding a first bypass cable and a second bypass cable;

[0011] A bypass load switch is arranged inside the shelter, and is arranged in series between the first bypass cable and the second bypass cable to form a continuous bypass circuit when the bypass load switch is closed.

[0012] A bypass system detection test platform includes an insulation resistance tester and a conduction test indicator, and is used to perform an electrical integrity test on the bypass circuit.

[0013] Specifically, the connection ends of the bypass load switch and the three phase conductors in the first bypass cable are set as A, B and C, and the connection ends of the bypass load switch and the three phase conductors in the second bypass cable are set as R, S and T.

[0014] The bypass system detection test platform further includes:

[0015] Six test terminals are set as an A-phase terminal, a B-phase terminal, a C-phase terminal, an R-phase terminal, an S-phase terminal and a T-phase terminal respectively, and are connected to the distal ends of the phase conductors in the first bypass cable and the second bypass cable respectively.

[0016] A conduction test phase sequence switch includes a first single-pole four-throw switch and a second single-pole four-throw switch, the moving blades of the first single-pole four-throw switch and the second single-pole four-throw switch are electrically connected to two input ends of the conduction test indicator respectively, three static contacts of the first single-pole four-throw switch are electrically connected to the A-phase terminal, the B-phase terminal and the C-phase terminal respectively, three static contacts of the second single-pole four-throw switch are electrically connected to the R-phase terminal, the S-phase terminal and the T-phase terminal respectively, and the fourth static contacts of the first single-pole four-throw switch and the second single-pole four-throw switch are both in an open position.

[0017] A test switch includes six single-pole single-throw switches, the A-phase terminal, the B-phase terminal and the C-phase terminal are electrically connected to one test end of the insulation resistance tester through three single-pole single-throw switches respectively, and the R-phase terminal, the S-phase terminal and the T-phase terminal are electrically connected to another test end of the insulation resistance tester through another three single-pole single-throw switches respectively.

[0018] Optionally, the number of the cable winding and unwinding mechanisms is two, and each cable winding and unwinding mechanism includes:

[0019] An optical shaft and a bearing assembly, two ends of the optical shaft are rotatably connected to the shelter through the bearing assembly;

[0020] A cable reel is used to wind the corresponding bypass cable, and the cable reel is coaxially fixed on the optical shaft.

[0021] a driving unit fixed in the shelter, and the driving unit is connected with the optical axis and used to drive the optical axis to rotate the cable reel;

[0022] wherein, the outer side of the cable reel is provided with a latch, and the inside of the shelter is provided with a fixing plate matched with the latch;

[0023] the latch and the fixing plate are selectively engaged, and the cable reel is locked when the latch and the fixing plate are engaged, and the locking of the cable reel is released when they are separated;

[0024] The bypass cable leading-out area of the shelter is provided with an insulating cross arm for supporting, guiding or fixing the bypass cable during the corresponding leading-out or retraction process.

[0025] Optionally, the bypass load switch is installed inside the shelter through a sliding mechanism, and the sliding mechanism is used to slide the bypass load switch out of the shelter;

[0026] The sliding mechanism comprises a heavy-duty sliding rail support, a heavy-duty sliding rail and a support plate, the heavy-duty sliding rail support is fixedly connected to the internal structure of the shelter, the heavy-duty sliding rail is in sliding connection with the heavy-duty sliding rail support, the support plate is fixedly connected with the heavy-duty sliding rail, and the bypass load switch is installed on the support plate.

[0027] Optionally, the bypass load switch comprises:

[0028] a switch body;

[0029] an electrically controlled operating mechanism used to drive the action of the main contact;

[0030] at least one voltage sensor and at least one current sensor configured to monitor the voltage value and current value passing through the bypass circuit;

[0031] at least one temperature sensor configured to monitor the temperature of the bypass load switch body or its connecting components; and

[0032] a data processing and forwarding module electrically connected with the voltage sensor, the current sensor and the temperature sensor, used to collect and process monitoring data, and forward the monitoring data to external equipment through a communication interface.

[0033] A use method of a towed live load transfer device, based on a towed live load transfer device as described above, the use method comprising:

[0034] transporting the towed live load transfer device to the predetermined work site and completing the deployment;

[0035] performing electrical integrity test on the bypass circuit composed of the bypass cable and the bypass load switch by using the bypass system test platform, the electrical integrity test at least including conduction test and insulation test;

[0036] after the electrical integrity test is completed, connecting the distal end of the bypass cable to the upstream power connection point and the downstream load connection point of the target line section to be subjected to load transfer, respectively;

[0037] closing the bypass load switch to energize the bypass circuit and make the bypass circuit conduct load, and delivering electric charge from the upstream power connection point to the downstream load connection point;

[0038] disconnecting the normal power supply path of the target line section, and performing work on the target line section;

[0039] monitoring the operating parameters of the bypass circuit in real time during power supply by the bypass circuit;

[0040] after the work on the target line section is completed, restoring the normal power supply path of the target line section, and operating the bypass load switch to disconnect the bypass circuit;

[0041] disconnecting the distal end connection of the bypass cable, and storing the towed live load transfer device;

[0042] updating the use record of the towed live load transfer device, and predicting the remaining service life by using the adaptive insulation degradation prediction model.

[0043] Specifically, the method of conducting the conduction test includes:

[0044] selecting a phase path to be tested, the phase path starting from a phase conductor in the first bypass cable, passing through the corresponding closed phase contact in the bypass load switch, and ending at the corresponding phase conductor in the second bypass cable;

[0045] ensuring that the phase contact in the bypass load switch corresponding to the phase path to be tested is in a closed state;

[0046] operating the first single-pole four-throw switch to connect one input end of the conduction test indicator to the test terminal corresponding to the starting point of the phase path to be tested;

[0047] operating the second single-pole four-throw switch to connect the other input end of the conduction test indicator to the test terminal corresponding to the ending point of the phase path to be tested;

[0048] starting the conduction test indicator to detect and confirm the electrical conduction state of the selected phase path to be tested.

[0049] Specifically, the method of conducting the insulation test includes:

[0050] According to a preset insulation test item, a first test point and a second test point of an insulation path to be tested are determined, and the preset insulation test item is: phase-to-phase insulation test, phase-to-ground insulation test, or bypass load switch break insulation test;

[0051] If the bypass load switch break insulation test is performed, it is ensured that the corresponding phase contact point in the bypass load switch which constitutes a part of the insulation path to be tested is in an open state;

[0052] The test switch is operated to connect the first test point to one test end of the insulation resistance tester;

[0053] If the second test point is a phase terminal, the test switch is operated to connect the second test point to the other test end of the insulation resistance tester; or, if the second test point is a ground reference point, the other test end of the insulation resistance tester is directly connected to the ground reference point;

[0054] It is ensured that the other phase terminals not involved in the current specific insulation test path are kept in an open state through their respective corresponding single-pole single-throw switches and the two test ends of the insulation resistance tester;

[0055] The insulation resistance tester is started, a preset test voltage is applied between the first test point and the second test point, and the insulation resistance value between the two is measured;

[0056] Among them,

[0057] When the phase-to-phase insulation test or the bypass load switch break insulation test is performed, the first test point is selected from one of the A phase terminal, the B phase terminal, the C phase terminal, the R phase terminal, the S phase terminal, or the T phase terminal, and the second test point is selected from another one of the A phase terminal, the B phase terminal, the C phase terminal, the R phase terminal, the S phase terminal, or the T phase terminal which is different from the first test point;

[0058] When the phase-to-ground insulation test is performed, the first test point is selected from one of the A phase terminal, the B phase terminal, the C phase terminal, the R phase terminal, the S phase terminal, or the T phase terminal, and the second test point is the ground reference point of the trailer live load transfer device.

[0059] Optionally, the method for predicting the remaining service life through the adaptive insulation degradation prediction model comprises:

[0060] The test data of the insulation performance parameters of one or more target insulation components is repeatedly obtained after multiple operations or time intervals, and the operating stress data and environmental condition data associated with each test are recorded; wherein the insulation performance parameters at least include the insulation resistance value after environmental factor compensation; the operating stress data at least include one or more of the number of deployments, the cumulative load time, or the current load size experienced;

[0061] Based on the obtained insulation performance parameter test data, operating stress data, and environmental condition data, an adaptive insulation degradation prediction model is established for the target insulation component;

[0062] Using the adaptive insulation degradation prediction model, in combination with the pre-set future operating stress expectation, the future degradation trajectory of one or more key insulation performance parameters of the target insulation component is predicted;

[0063] According to the predicted future degradation trajectory and the pre-defined insulation performance failure threshold, the remaining service life of the target insulation component is estimated.

[0064] Optionally, the method of establishing an adaptive insulation degradation prediction model comprises:

[0065] Defining a state variable representing the insulation performance state of the target insulation component , establishing an insulation degradation base model for describing the evolution of the state variable over time, wherein, is the time point of the th test, is the initial or baseline health state value of the insulation component, is a cumulative degradation function, which is used to describe the amount of health state decline caused by the parameter vector and the operating stress together up to the time point ; is a parameter vector containing model parameters; is a vector set of the number of deployments , the cumulative load time , the current load experienced , and the environmental conditions; is an uncertainty term of the model error;

[0066] Initializing the prior probability distribution of the parameter vector ;

[0067] After obtaining the actual observation value of the insulation performance state variable of the new target insulation component at the th time, and corresponding operational stresses Afterwards, the following parameter updating steps are performed to achieve the adaptivity of the model:

[0068] According to the insulation degradation base model and newly acquired data, a likelihood function is defined which quantifies the probability of observing the test data under the condition of given model parameters , stress data , initial state and degradation function ;

[0069] By applying Bayes' theorem, the posterior probability distribution of the parameter vector is calculated and updated , where is proportional to ;

[0070] The statistical quantity of the updated posterior probability distribution is taken as the current optimal estimation value of the parameter vector , and the adaptive insulation degradation prediction model is updated.

[0071] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0072] The present application integrates key components such as bypass load switches, cable winding and unwinding mechanisms, and bypass system test platforms in a towed shelter, reducing the construction time and complexity of field equipment before bypass operation, and improving the deployment efficiency of bypass operation and the rapid response capability of overall operation.

[0073] In addition, by integrating the bypass system test platform in the shelter, through the cooperation of the on-off test phase sequence switch and the test switch with the test instrument, the on-off performance and insulation performance of the bypass cable and bypass load switch are electrically detected before the bypass circuit is formally put into operation, improving the safety of live load transfer operation and avoiding power supply accidents that may be caused by electrical faults of bypass equipment.

[0074] The present application also predicts the remaining service life of key insulation components by introducing a multi-stress predictive insulation degradation model, and updates it in combination with usage records, which can realize the transition from passive maintenance to predictive maintenance and avoid faults at positions such as bypass cables or switch joints during use. BRIEF DESCRIPTION OF DRAWINGS

[0075] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0076] Figure 1 is a structural schematic diagram of a trailer-type live load transfer device according to the present application.

[0077] Figure 2 is a wiring schematic diagram of a bypass system test test platform according to the present application.

[0078] Figure 3 is a structural schematic diagram of a shelter according to the present application.

[0079] Figure 4 is a structural schematic diagram of a cable winding and unwinding mechanism according to the present application.

[0080] Figure 5 is a structural schematic diagram of a sliding mechanism according to the present application.

[0081] Figure 6 is a wiring schematic diagram of a bypass load switch according to the present application.

[0082] Figure 7 is a flowchart of a method for using a trailer-type live load transfer device according to the present application.

[0083] Figure 8 is a flowchart of a method for conducting a conduction test according to the present application.

[0084] Figure 9 is a flowchart of a method for conducting an insulation test according to the present application.

[0085] Figure 10 is a flowchart of a method for predicting a remaining service life according to the present application.

[0086] Figure 11 is a flowchart of a method for establishing an adaptive insulation degradation prediction model according to the present application.

[0087] Reference: 1 - shelter, 2 - cable reel, 3 - bypass load switch, 4 - trailer chassis, 5 - insulating cross arm, 1-1 - control panel, 1-2 - operation panel, 1-3 - front door, 1-4 - warning light, 1-5 - lifting ring, 1-6 - rear door, 1-7 - side up door, 1-8 - side rolling shutter door, 2-1 - motor, 2-2 - key, 2-3 - bearing seat, 2-4 - bearing seat screw, 2-5 - bearing fixing piece, 2-6 - latch fixing seat, 2-7 - clasp spring, 2-8 - bearing, 2-9 - bearing fixing ring, 2-10 - cable reel, 2-11 - latch, 2-12 - fixed plate, 2-13 - thrust block, 2-14 - jackscrew, 2-15 - optical axis, 3-1 - heavy-duty slide rail support, 3-2 - heavy-duty slide rail. DETAILED DESCRIPTION

[0088] To make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related content, and are not a limitation to the present application.

[0089] In addition, it also needs to be explained that only the parts related to the present application are shown in the drawings for convenience of description.

[0090] The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below in combination with the drawings and embodiments.

[0091] Example one

[0092] As shown in the drawings, a mobile, integrated bypass power supply solution is provided, and a test capability for electrical integrity of the bypass circuit itself is built in, and the key components (cables, switches) required for bypass power supply and test instruments are integrated in a shelter 1 that can be towed by a vehicle, so as to be quickly deployed to the work site, and to perform safety inspection on the temporary power supply line to be established before formal bypass power supply. Figure 1 A trailer type live load transfer device, comprising: a trailer chassis 4, a shelter 1, a cable reel 2, a bypass load switch 3 and a bypass system detection test platform.

[0093] The trailer chassis 4 can be towed to different work sites by a vehicle, and the shelter 1 is installed on the trailer chassis 4 to form a closed or semi-closed working space for accommodating and protecting various equipment components inside.

[0094] The trailer chassis 4 can be towed to different work sites by a vehicle, and the shelter 1 is installed on the trailer chassis 4 to form a closed or semi-closed working space for accommodating and protecting various equipment components inside.

[0095] At least one cable winding mechanism 2 is arranged inside the shelter 1 and is used to wind and unwind the first bypass cable and the second bypass cable; a bypass load switch 3 is arranged inside the shelter 1, the bypass load switch 3 is arranged in series between the first bypass cable and the second bypass cable, and when the bypass load switch 3 is closed, the first bypass cable and the second bypass cable can form a continuous bypass circuit.

[0096] The bypass system test platform is used for performing electrical integrity tests on the bypass circuit, and includes an insulation resistance tester and a conduction test indicator.

[0097] The insulation resistance tester is used to measure the resistance value of the insulation material of an electrical device or circuit. The insulation resistance is an important indicator of insulation performance, and the higher the value, the better the insulation performance and the lower the risk of leakage or breakdown.

[0098] The conduction test indicator is used to check whether the circuit has a low-resistance path (i.e., whether it is conductive), and to indicate whether there are problems such as open circuits or poor contacts in the circuit.

[0099] As shown in Figure 2 , a connection structure of the bypass system test platform and a three-phase bypass circuit (composed of the first bypass cable, the bypass load switch 3, and the second bypass cable) is provided to realize conduction testing and insulation testing on each phase path.

[0100] The connection ends of the bypass load switch 3 and the three phase conductors in the first bypass cable are set as A, B, and C, and the connection ends of the bypass load switch 3 and the three phase conductors in the second bypass cable are set as R, S, and T; the phase conductor refers to a wire used to transmit a current with a specific phase in an alternating multi-phase system. In general, the A, B, and C phases correspond to the R, S, and T phases, respectively, i.e., the current flows into the switch from the A phase, flows out from the R phase; the B phase flows in, the S phase flows out; the C phase flows in, and the T phase flows out, collectively forming a three-phase bypass path.

[0101] The bypass system test platform further includes test terminals, a conduction test phase sequence switch, and a test switch.

[0102] The six test terminals, also known as test terminals, are interfaces for electrically connecting test instruments to key points inside the bypass circuit. According to the connection with the bypass load switch 3, they are set as A-phase terminal, B-phase terminal, C-phase terminal, R-phase terminal, S-phase terminal, and T-phase terminal, and are respectively connected to the distal ends of the phase conductors in the first bypass cable and the second bypass cable, i.e.,

[0103] The A-phase terminal is connected to the other end of the A-phase conductor of the first bypass cable (i.e., the end other than the end connected to the switch A).

[0104] The B-phase terminal is connected to the other end of the B-phase conductor of the first bypass cable.

[0105] The C terminal post is connected to the other end of the first bypass cable C phase conductor.

[0106] The R terminal post is connected to the other end of the second bypass cable R phase conductor (i.e. the end not connected to the R end of the switch).

[0107] The S terminal post is connected to the other end of the second bypass cable S phase conductor.

[0108] The T terminal post is connected to the other end of the second bypass cable T phase conductor.

[0109] The continuity test phase sequence switch comprises a first single-pole four-throw switch and a second single-pole four-throw switch, the moving pieces of the first and second single-pole four-throw switches are respectively electrically connected with two input ends of the continuity test indicator; three static contacts of the first single-pole four-throw switch are respectively electrically connected with the A, B and C terminal posts, and three static contacts of the second single-pole four-throw switch are respectively electrically connected with the R, S and T terminal posts; the fourth static contact of the first and second single-pole four-throw switches is in an open position;

[0110] By operating the two single-pole four-throw switches, any one of the A, B and C terminal posts can be selected as one end of the continuity test, and any one of the R, S and T terminal posts can be selected as the other end of the continuity test, so that different paths (especially the complete continuity paths corresponding to the phases such as A-R, B-S and C-T, which include the phase conductors of the first bypass cable, the corresponding phase contacts of the closed bypass load switch 3 and the phase conductors of the second bypass cable) such as A-R, A-S, A-T, B-R, B-S, B-T, C-R, C-S and C-T can be tested for continuity.

[0111] The test sequence switch comprises six single-pole single-throw switches, the A, B and C terminal posts are respectively electrically connected with one test end of the insulation resistance tester through three single-pole single-throw switches, and the R, S and T terminal posts are respectively electrically connected with the other test end of the insulation resistance tester through the other three single-pole single-throw switches, so that various insulation tests can be flexibly performed:

[0112] Inter-phase insulation test: close the single-pole single-throw switch corresponding to the A phase (connected to one end of the tester), close the single-pole single-throw switch corresponding to the B phase (connected to the other end of the tester), and open all the other single-pole single-throw switches, so as to test the insulation resistance between the A phase conductor and the B phase conductor.

[0113] Relative insulation test: close the single-pole single-throw switch corresponding to phase A (connect one end to the tester), and connect the other end of the tester to the ground reference point of the device (usually the shelter 1 shell or a dedicated grounding stake), and the insulation resistance of the A phase conductor to ground can be tested.

[0114] Switch break insulation test (when bypass load switch 3 is disconnected from the corresponding phase): for example, close the single-pole single-throw switch corresponding to phase A (connect one end to the tester), and close the single-pole single-throw switch corresponding to phase R (connect the other end to the tester), and the insulation resistance between the A-R phase break of the bypass load switch 3 can be tested.

[0115] When conducting a conduction test, the operator selects the two ends of the path to be tested (for example, the terminals of phase A and phase R) through two single-pole four-throw switches to connect to the conduction test indicator. When conducting an insulation test, the corresponding test terminal (or one end terminal and the other end grounded) is connected to the insulation resistance tester according to the test item (such as A phase to B phase insulation, or A phase to ground insulation) through six single-pole single-throw switches, thereby simplifying the wiring work of the field test.

[0116] Example 2

[0117] As shown in Figure 3 , the structure of the shelter 1 is described, and the shelter 1 is designed with various types of doors to facilitate access to the internal equipment from different directions

[0118] The shelter 1 comprises:

[0119] an assembly steel frame;

[0120] at least one front opening door 1-3 arranged on the front side of the assembly steel frame;

[0121] at least one rear opening door 1-6 arranged on the rear side of the assembly steel frame;

[0122] two side doors arranged on the two sides of the assembly steel frame, the side doors comprising a lower side roller shutter door 1-8 and an upper side overhead door 1-7; the side roller shutter door 1-8 is located in the lower half of the side door and is opened in a roller shutter manner; the side overhead door 1-7 is located in the upper half of the side door and is opened in an upwardly pivoting manner.

[0123] The cable winding and unwinding mechanism 2 is arranged on the upper layer inside the shelter 1, and the bypass load switch 3 is installed on the lower layer inside the shelter 1 through a sliding mechanism, which is used to slide the bypass load switch 3 out of the shelter 1 to the outside of the shelter 1 after the front opening door 1-3 is opened. When the bypass load switch 3 needs to be operated or maintained, the front opening door 1-3 of the shelter 1 can be opened first, and then the bypass load switch 3 can be smoothly pulled out from the inside of the shelter 1 to the outside of the shelter 1 through the sliding mechanism, which facilitates wiring, checking, setting, or maintenance work, etc.

[0124] In addition, a control panel 1-1 and an operation panel 1-2 are arranged on the assembly frame to facilitate control and state monitoring of the entire transfer device. An alarm lamp 1-4 for warning and a lifting ring 1-5 for lifting are arranged above the assembly steel frame.

[0125] As shown in Figure 4 the specific structure of the cable winding and unwinding mechanism 2 is provided,

[0126] The number of cable winding and unwinding mechanisms 2 is two, which are respectively used for winding and unwinding the first bypass cable and the second bypass cable.

[0127] The cable winding and unwinding mechanism 2 comprises:

[0128] an optical shaft 2-15 and a bearing assembly, both ends of the optical shaft 2-15 are rotatably connected with the shelter 1 through the bearing assembly; the bearing assembly (usually including a bearing and a bearing seat) is installed on the structure of the shelter 1, used for supporting the optical shaft 2-15 and enabling it to rotate freely with low friction.

[0129] a cable reel 2-10 for winding the corresponding bypass cable, and the cable reel 2-10 is coaxially fixed on the optical shaft 2-15; the cable reel 2-10 is a disc structure directly used for winding and storing the bypass cable, and the rotation of the optical shaft 2-15 directly drives the rotation of the cable reel 2-10.

[0130] a driving unit (an electric motor is adopted in this embodiment), which is fixed in the shelter 1 and connected with the optical shaft 2-15 and used for driving the optical shaft 2-15 to rotate the cable reel 2-10;

[0131] In order to prevent the cable from being accidentally loosened or rotated during transportation or in a non-working state, a locking mechanism is arranged, the outside of the cable reel 2-10 is provided with a latch 2-11, and the inside of the shelter 1 is provided with a fixed plate 2-12 matched with the latch 2-11;

[0132] The latch 2-11 selectively engages with the fixed plate 2-12, and when the latch 2-11 engages with the fixed plate 2-12, the cable reel 2-10 is locked, and when they are separated, the locking of the cable reel 2-10 is released;

[0133] The bypass cable leading-out area of the shelter 1 is provided with an insulating cross arm 5, which is a support arm or member with good insulation performance, used for supporting, guiding or fixing the corresponding bypass cable during its leading-out or retraction, preventing the cable from rubbing, knotting or being subjected to unnecessary stress with other parts of the shelter 1, and also playing a certain fixing role to ensure the stability of the cable at the leading-out point.

[0134] Installation steps:

[0135] Installation Step 1: Weld the cable reel 2-10, and weld the bearing fixing part 2-5 on the cable reel 2-10,

[0136] Installation Step 2: Fix the bearing fixing part 2-5, the bolt fixing seat 2-6, the snap spring 2-7, the bearing 2-8, the bearing fixing ring 2-9, the bolt 2-11, and the fixing plate 2-12 on the cable reel 2-10 respectively by screws.

[0137] Installation Step 3: Connect the motor 2-1 with the bearing seat 2-3, and connect the cable reel 2-10 with the optical shaft 2-15.

[0138] Installation Step 4: Install the flat key 2-2, the top screw 2-14, and the thrust block 2-13 on the optical shaft 2-15 respectively, and tighten and position them.

[0139] As shown in Figure 5 , the bypass load switch 3 is installed inside the shelter 1 by a sliding mechanism, which is used to slide the bypass load switch 3 out of the shelter 1.

[0140] The sliding mechanism includes a heavy-duty sliding rail bracket 3-1, a heavy-duty sliding rail 3-2, and a support plate. The heavy-duty sliding rail bracket 3-1 is fixedly connected to the internal structure of the shelter 1, the heavy-duty sliding rail 3-2 is in sliding connection with the heavy-duty sliding rail bracket 3-1, and the support plate is fixedly connected with the heavy-duty sliding rail 3-2. The bypass load switch 3 is installed on the support plate.

[0141] The heavy-duty sliding rail bracket 3-1 is fixed as a stationary base inside the shelter 1, one end of the heavy-duty sliding rail 3-2 is connected or integrated with the heavy-duty sliding rail bracket 3-1, and the other end can slide linearly relative to the bracket. The bypass load switch 3 is installed on the support plate fixed to the movable part of the heavy-duty sliding rail 3-2. When the switch needs to be operated or maintained, the operator can pull the support plate, and the support plate will take the bypass load switch 3 along the guide path of the heavy-duty sliding rail 3-2 and smoothly slide out of the shelter 1 to the outside of the shelter 1. After the work is completed, it is pushed back into the shelter 1.

[0142] As shown in Figure 6 , the bypass load switch 3 includes:

[0143] The switch body, which realizes the basic on-off function, contains conductive main contacts and arc extinguishing devices, etc.

[0144] The electric control operating mechanism, which is used to drive the action of the main contacts, realizes the closing (closing) and opening (opening) actions of the main contacts, and can realize remote operation and rapid response of the switch by using electric control (such as electromagnetic mechanism or electric mechanism).

[0145] At least one voltage sensor and at least one current sensor are configured to monitor the voltage and current values through the bypass circuit.

[0146] The high-voltage side voltage is converted into a low-voltage signal by a high-precision resistance voltage divider in series, and is transmitted to the monitoring terminal through an isolation amplifier. The high-precision resistance voltage divider uses precise resistors in series to proportionally reduce the high voltage to obtain a low voltage sampling signal proportional to the actual high voltage. The isolation amplifier is used to electrically isolate the low voltage signal from the subsequent measurement circuit or data acquisition module to ensure safety and reduce interference, and then transmit to the data processing and forwarding module.

[0147] The Hall element detects the magnetic field strength around the conductor and outputs a voltage signal proportional to the current. The Hall effect is used to measure the magnetic field strength, which is generated when current flows through the conductor placed in a magnetic field, and the potential difference is generated in the direction perpendicular to the current and magnetic field of the conductor. Since the current flowing through the conductor generates a magnetic field, and the magnetic field strength is proportional to the current size, the current size can be indirectly measured by the Hall element and converted into a voltage signal output.

[0148] At least one temperature sensor is configured to monitor the temperature of the bypass load switch 3 body or its connecting parts; when the switch carries a large current, the contact, connecting terminal and other parts may overheat due to contact resistance or overload. The temperature sensor is used to monitor the temperature of these key parts to prevent the switch from being damaged or causing accidents due to overheating.

[0149] The data processing and forwarding module is electrically connected with the voltage sensor, current sensor and temperature sensor, used to collect and process monitoring data, and transmit the monitoring data to external equipment through the communication interface.

[0150] Data processing: including signal amplification, filtering, analog-to-digital conversion (A / D conversion), calculation of effective value, comparison with preset threshold value, etc. The system consists of sensor→signal conditioning circuit→data acquisition module (DAQ)→host computer display and alarm. Real-time display of voltage, current effective value and overline alarm can be realized.

[0151] The switch body completes the on-off of the circuit under the drive of the electric control operating mechanism. When the bypass circuit is working, the built-in voltage sensor (using resistance division principle), current sensor (using Hall element principle) and temperature sensor continuously monitor the key parameters. After signal conditioning and data acquisition, these sensor signals are processed by the data processing and forwarding module (such as calculating the effective value and judging whether it is out of limit), and finally the real-time data and alarm information are sent out through the communication interface.

[0152] Example three

[0153] As Figure 7As shown, a method for using a towed live load transfer device is provided to achieve uninterrupted power supply switching and protection for users when work needs to be carried out on a certain section of power line or equipment. The method comprises:

[0154] Transport the towed live load transfer device to the intended work site and complete the deployment, such as securing the trailer chassis to ensure the stability of the device during subsequent operations, and preparing the equipment in the shelter 1 for use.

[0155] Perform electrical integrity testing on the bypass circuit composed of bypass cable and bypass load switch 3 using the bypass system test platform. The electrical integrity test at least includes conduction test and insulation test. The conduction test is used to check whether the connection of each phase conductor of the bypass circuit is reliable, whether there is a break or poor contact, and to ensure that the current can flow smoothly. The insulation test is used to check whether the insulation performance between each phase, each phase to ground and the switch gap is good, to prevent short circuit or electric leakage accident.

[0156] After the electrical integrity test is completed, the far end of the bypass cable is connected to the upstream power supply connection point and the downstream load connection point of the target line section to be transferred.

[0157] Close the bypass load switch 3 to close the bypass circuit, so that the bypass circuit is powered and carries the load, and the charge is transported from the upstream power supply connection point to the downstream load connection point. The current (charge) starts to flow through the bypass cable and the closed bypass load switch 3 from the upstream power supply connection point to the downstream load connection point, and the bypass circuit starts to carry or prepare to carry all the load.

[0158] Disconnect the normal power supply path of the target line section and carry out work on the target line section. After confirming that the bypass circuit has successfully carried the load and is stable, the original normal power supply path can be safely disconnected (for example, by operating the disconnecting switch or circuit breaker at both ends of the target line section). At this time, the target line section is completely powered off, and the work personnel can enter the section to carry out the predetermined maintenance, maintenance or repair work.

[0159] During the power supply through the bypass circuit, the operating parameters of the bypass circuit are monitored in real time. The monitoring function integrated in the bypass load switch 3 (such as example two) is used to monitor the voltage, current, temperature and other key operating parameters of the bypass circuit in real time, to ensure the safety and stability of the bypass power supply.

[0160] After the work on the target line section is completed, the normal power supply path of the target line section is restored by operating the bypass load switch 3 to disconnect the bypass circuit; first, it is necessary to restore its normal power supply path (for example, by closing the previously disconnected isolating switch or circuit breaker). After confirming that the normal power supply path has been restored and is stably accepting the load, the bypass load switch 3 in the shelter 1 is then operated to disconnect it, so that the bypass circuit is taken out of operation. This sequence of "connecting the main line first, then disconnecting the bypass" ensures a seamless power supply switchover.

[0161] Disconnect the far end of the bypass cable and store the towed live load transfer device; that is, use the cable retraction mechanism 2 to retract the bypass cable into the container 1, and organize the other parts of the device in preparation for evacuation from the site.

[0162] Update the usage records of the trailer-mounted live load transfer device and predict its remaining useful life using an adaptive insulation degradation prediction model. After each operation, record the device's usage (e.g., number of deployments, runtime, load conditions, environmental conditions, etc.), and use a multi-stress predictive insulation degradation model, combined with the current usage records and historical data, to assess the current condition of the device's key insulation components (such as bypass cables, switch insulation, etc.) and predict their remaining useful life (RUL). This helps to achieve predictive maintenance and health management of the equipment.

[0163] Example 4

[0164] like Figure 8 As shown, the specific steps for performing a continuity test are provided, including:

[0165] Select a phase path to be tested. The phase path starts from a phase conductor in the first bypass cable, passes through the corresponding closed phase contact in the bypass load switch 3, and terminates in the corresponding phase conductor in the second bypass cable. Specify which phase's complete continuity path you want to test. For example, if you want to test the continuity of phase A, the path would include: starting from the phase A conductor of the first bypass cable, passing through the main contact of phase A (which should be closed) inside the bypass load switch 3, and finally to the phase R conductor of the second bypass cable.

[0166] The purpose of the test is to check whether the entire path, including the closed contact of the switch, is connected, and to ensure that the phase contact in the bypass load switch 3 corresponding to the phase path to be tested is in the closed state.

[0167] Operate the first single-pole four-throw switch to connect one input terminal of the continuity test indicator to the test terminal corresponding to the starting point of the path of the phase under test (e.g., one of the A-phase test terminal, B-phase test terminal, or C-phase test terminal).

[0168] The second single-pole four-throw switch is operated to connect the other input of the continuity test indicator to the test terminal corresponding to the end of the phase path to be tested (e.g., one of the R-phase test terminal, the S-phase test terminal, or the T-phase test terminal).

[0169] The continuity test indicator is activated to detect and confirm the electrical continuity of the selected phase path to be tested. The instrument applies a small voltage or current to the path under test and then determines whether the selected complete phase path is electrically continuous based on its response. If it is continuous, it indicates that the phase path is properly connected; if it is not continuous, it indicates that there may be a break or poor contact in the path.

[0170] By precisely switching the two single-pole four-throw switches, the two ends of the path under test are selectively connected to the two inputs of the continuity test indicator. The continuity test indicator determines whether there is a low-impedance electrical path between the two selected points through a simple electrical test (e.g., a small current continuity test). The A-R, B-S, and C-T phase paths of the device can be sequentially applied to complete the inspection of the main continuity path of the bypass circuit.

[0171] Embodiment Five

[0172] As shown in Figure 9 , specific method steps for performing insulation tests are provided. According to different test items (inter-phase insulation, phase-to-ground insulation, and bypass load switch gap insulation), the two key test points of the path under test are connected to the insulation resistance tester through the operation of specific transfer switches (six single-pole single-throw switches) to evaluate the insulation performance of these paths.

[0173] The method for performing insulation tests includes:

[0174] According to the preset insulation test item, the first test point and the second test point of the insulation path to be tested are determined. The preset insulation test items are: inter-phase insulation test, phase-to-ground insulation test, or bypass load switch gap insulation test. Different types of tests require different test points.

[0175] If the bypass load switch gap insulation test is performed, it is ensured that the corresponding phase contact in the bypass load switch 3 that forms part of the insulation path to be tested is in the open state, otherwise the test will be the resistance of the closed loop (which should be a very small value) rather than the insulation resistance.

[0176] The test transfer switch is operated to connect the first test point to one test end of the insulation resistance tester;

[0177] If the second test point is a phase terminal, the operating test switch connects the second test point to the other test terminal of the insulation resistance tester; or, if the second test point is a ground reference point, the other test terminal of the insulation resistance tester is directly connected to the ground reference point.

[0178] Ensure that other phase terminals not involved in the current specific insulation test path are kept disconnected from both test terminals of the insulation resistance tester through their respective single-pole single-throw switches; in order to ensure the accuracy of the test results, only the two points being tested should be connected to the tester. All other phase terminal corresponding single-pole single-throw switches must be in the off position to prevent them from being connected to the test circuit, interfering with the test results or causing false insulation paths.

[0179] Start the insulation resistance tester, apply a preset test voltage between the first test point and the second test point, and measure the insulation resistance value between the two; the insulation resistance tester will apply a higher DC voltage (e.g. 500V, 1000V, 2500V, etc.) between the two selected test points, and measure the tiny leakage current flowing through the insulation material, then calculate the insulation resistance value according to Ohm's law. The measured insulation resistance value will be compared with the standard or empirical threshold to determine whether the insulation performance of the measured path is qualified.

[0180] Wherein, the phase-to-phase insulation test is to measure the insulation resistance between different phase conductors. The phase-to-ground insulation test is to measure the insulation resistance between each phase conductor and the device ground (ground reference point). The bypass load switch open insulation test is to measure the insulation resistance between the incoming and outgoing terminals of the same phase of the switch in the open state.

[0181] When performing a phase-to-phase insulation test or a bypass load switch open insulation test, the first test point is selected from one of the A-phase terminal, B-phase terminal, C-phase terminal, R-phase terminal, S-phase terminal or T-phase terminal, and the second test point is selected from another one of the A-phase terminal, B-phase terminal, C-phase terminal, R-phase terminal, S-phase terminal or T-phase terminal different from the first test point; (for example, to test the insulation between A-phase and B-phase, the first test point is the A-phase terminal and the second test point is the B-phase terminal; to test the open insulation of the A-phase switch, the first test point is the A-phase terminal and the second test point is the R-phase terminal).

[0182] When performing a phase-to-ground insulation test, the first test point is selected from one of the A-phase terminal, B-phase terminal, C-phase terminal, R-phase terminal, S-phase terminal or T-phase terminal, and the second test point is the ground reference point of the trailer live load transfer device (such as the metal shell of Shelter 1 or a dedicated ground terminal).

[0183] Embodiment Six

[0184] AsFigure 10 As shown, a prediction model is provided, which can be continuously optimized to predict future insulation status and life by continuously collecting measured data of insulation performance and various operating and environmental factors affecting its aging.

[0185] The method of predicting the remaining useful life by the adaptive insulation degradation prediction model comprises:

[0186] For one or more target insulation components (such as the insulation layer of the bypass cable or the insulation inside the bypass load switch 3), after multiple operations or time intervals, repeatedly obtain test data of its insulation performance parameters, and record operating stress data and environmental condition data associated with each test; wherein the insulation performance parameters at least include the insulation resistance value after environmental factor compensation (for example, corrected according to temperature, humidity, to eliminate the interference of environmental changes on the reading, to obtain more comparable data); the operating stress data at least includes one or more of the number of deployments, the cumulative load time or the size of the current load experienced;

[0187] Based on the obtained insulation performance parameter test data, operating stress data and environmental condition data (environmental factors such as average temperature, humidity when the equipment is running or stored), an adaptive insulation degradation prediction model for the target insulation component is established;

[0188] Using the adaptive insulation degradation prediction model, combined with the pre-set future operating stress expectation, the future degradation trajectory of one or more key insulation performance parameters of the target insulation component is predicted; the future operating stress expectation estimates the future use intensity of the equipment (such as the expected annual number of deployments, load conditions, etc.). The expected future stress is input into the model, and the model can calculate the possible downward trend and change path of the key insulation performance parameters (such as the corrected insulation resistance value) in the future period of time.

[0189] According to the predicted future degradation trajectory and the pre-defined insulation performance failure threshold, when the parameter degradation is below the failure threshold, it is considered that the insulation component has reached the end of its useful life or there is an unacceptable risk, and needs to be replaced or major repaired. That is, the remaining useful life of the target insulation component is estimated.

[0190] To predict the future, the operating stress and environmental conditions that the component may experience in the future period of time need to be estimated, including: the expected future number of deployments, the expected future cumulative load time, the expected future current load condition and the expected future average environmental condition, and constitute the future stress vector sequence ;

[0191] Then use the insulation degradation basic model that has obtained the optimal parameter estimate value to predict the degradation trajectory of the future insulation performance state variable , .

[0192] By this equation, we can extrapolate a series of expected insulation condition values at different future time points , thus forming a future degradation trajectory.

[0193] One or more failure thresholds of the state variable need to be predefined , when the degradation reaches the failure threshold, the insulation component is considered failed or reached a level that needs immediate replacement / maintenance

[0194] The predicted future degradation trajectory is compared with the predefined failure threshold, the remaining useful life is defined as the time needed from the current time point to the first time the predicted reaches or falls below the failure threshold.

[0195] As shown in Figure 11 , a specific method of establishing an adaptive insulation degradation prediction model is provided, comprising:

[0196] First, one or more state variables that can quantitatively reflect the insulation performance of the target insulation component (such as bypass cable, switch insulation) are selected, and the state variable is defined as the logarithm of the insulation resistance value after environmental factor compensation: , wherein is the insulation resistance value measured at time point and compensated for temperature (e.g., corrected by formula) and humidity.

[0197] Then, an insulation degradation base model is established to describe how the state variable evolves over time (or number of uses, operating period, etc.) , wherein is the time point of the th test, is the initial or baseline health state value of the insulation component, which is set as the average value of the insulation component in a new state or in an early stable operation stage, and can be obtained by statistical averaging of a batch of similar new components or calibrated when the component is first put into use. obeys a normal distribution with mean 0 and variance , i.e. .

[0198] is the cumulative degradation function, which is used to describe the cumulative degradation up to time point by the parameter vector ​and operational stresses degradation in health state due to the combined effects; is a parameter vector containing model parameters; is a vector containing cumulative load time experienced current load and environmental conditions; is an uncertainty term for model error;

[0199] The cumulative degradation function can be chosen as .

[0200] is a parameter vector, with the following parameters:

[0201] : base time degradation rate coefficient.

[0202] : impact coefficient of each deployment operation (total number of deployments up to ) on degradation.

[0203] : impact coefficient of cumulative load time (total number of hours of live load up to ) on degradation.

[0204] : impact coefficient of current load stress on degradation, which can be some average measure (e.g., root-mean-square or arithmetic mean) of the peak current experienced up to

[0205] : impact coefficient of temperature stress on degradation, as a function of average ambient temperature , e.g., can use the Arrhenius model-related form, or simplify to , where is a reference temperature without significant thermal stress, is a sensitivity coefficient.

[0206] : impact coefficient of humidity stress on degradation, as a function of average ambient humidity , e.g. .

[0207] The vector set contains the above-mentioned specific stress factors ,​​​ , , , as well as itself.

[0208] Initialize parameter vector Prior probability distribution This reflects our initial beliefs or existing knowledge about the possible values ​​of these parameters. This knowledge can come from historical data of similar components, inferences from physicochemical principles, information from manufacturers, or expert judgment.

[0209] After obtaining the number State variables of insulation performance of the new target insulation component Actual observed values and the corresponding operating stress Then, perform the following parameter update steps to achieve model adaptability:

[0210] Based on the basic insulation degradation model and newly acquired data, the likelihood function is defined. This likelihood function quantifies the likelihood of a given model parameter. Stress data Initial state and degenerate function Under these conditions, test data were observed. The probability of the normal distribution at the observation point; the likelihood function is the probability of the normal distribution at the observation point. probability density function value .

[0211] Applying Bayes' theorem, combined with prior probability distribution and likelihood function The parameter vector is calculated and updated. posterior probability distribution , ,in, It is proportional to; the calculation methods include: Markov chain Monte Carlo (MCMC) method, variational inference method or sequence Monte Carlo / particle filtering method.

[0212] The posterior distribution is obtained through the method. After obtaining the samples, each parameter can be calculated. The expected value, median, or mode is used as its current best point estimate. The adaptive insulation degradation prediction model is then updated.

[0213] In the description of the specification, the description of the terms "one embodiment / way", "some embodiments / ways", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the description of the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, the person skilled in the art can combine and combine the different embodiments / ways or examples described in the specification and the features of the different embodiments / ways or examples, without contradiction.

[0214] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0215] The person skilled in the art should understand that the above-mentioned embodiments are only for the purpose of clearly illustrating the present application, and are not intended to limit the scope of the present application. For those skilled in the art, other changes or modifications can be made on the basis of the above-mentioned application, and these changes or modifications are still within the scope of the present application.

Claims

1. A method of using a trailer-mounted live load transfer device, characterized in that, Based on a trailer-type live load transfer device, the transfer device includes: a trailer chassis (4). The container (1) is mounted on the trailer chassis (4); At least one cable retraction mechanism (2) is provided inside the container (1) and is used to retract the first bypass cable and the second bypass cable; Bypass load switch (3), the bypass load switch (3) is installed inside the cabin (1), the bypass load switch (3) is connected in series between the first bypass cable and the second bypass cable, so as to form a continuous bypass circuit when the bypass load switch (3) is closed; A bypass system testing platform, comprising an insulation resistance tester and a continuity test indicator, is used to perform electrical integrity testing on the bypass circuit; The method of use includes: Transport the trailer-mounted live load transfer device to the designated work site and complete its deployment; Electrical integrity tests were performed on the bypass circuit consisting of bypass cable and bypass load switch (3) using the bypass system testing platform. The electrical integrity tests included at least continuity tests and insulation tests. After the electrical integrity test is completed, connect the far end of the bypass cable to the upstream power connection point and the downstream load connection point of the target line section to be transferred. Operate the bypass load switch (3) to close the bypass circuit, so that the bypass circuit is energized and takes over the load, and transfer the charge from the upstream power connection point to the downstream load connection point; Disconnect the normal power supply path to the target line section and carry out operations on the target line section; During power supply via the bypass circuit, the operating parameters of the bypass circuit are monitored in real time. After the work on the target line section is completed, restore the normal power supply path of the target line section and operate the bypass load switch (3) to disconnect the bypass circuit; Disconnect the far end of the bypass cable and store the towed live load transfer device. Update the usage records of the trailer-mounted live load transfer device and predict its remaining service life using an adaptive insulation degradation prediction model; the methods for predicting the remaining service life using the adaptive insulation degradation prediction model include: For one or more target insulating components, after multiple operations or time intervals, test data of their insulation performance parameters are repeatedly acquired, and operating stress data and environmental condition data associated with each test are recorded; wherein, the insulation performance parameters include at least the insulation resistance value after environmental factor compensation; the operating stress data includes at least one or more of the following: number of deployments, cumulative load time, or magnitude of experienced current load; Based on the obtained insulation performance parameter test data, operating stress data and environmental condition data, an adaptive insulation degradation prediction model for the target insulation component is established. By using an adaptive insulation degradation prediction model, combined with a pre-set expectation of future operating stress, the future degradation trajectory of one or more key insulation performance parameters of the target insulation component can be predicted. The remaining service life of the target insulation component is estimated based on the predicted future degradation trajectory and the predefined insulation performance failure threshold.

2. The method of using a trailer-mounted live load transfer device according to claim 1, characterized in that, The connection terminals of the bypass load switch (3) and the three phase conductors in the first bypass cable are set to A, B, and C, and the connection terminals of the bypass load switch (3) and the three phase conductors in the second bypass cable are set to R, S, and T. The bypass system testing platform also includes: The six test terminals are designated as phase A, phase B, phase C, phase R, phase S, and phase T terminals, respectively, and are connected to the far ends of the phase conductors in the first bypass cable and the second bypass cable, respectively. The continuity test phase sequence changeover switch includes a first single-pole four-throw switch and a second single-pole four-throw switch. The moving contacts of the first and second single-pole four-throw switches are electrically connected to the two input terminals of the continuity test indicator, respectively. The three stationary contacts of the first single-pole four-throw switch are electrically connected to the A-phase terminal, the B-phase terminal, and the C-phase terminal, respectively. The three stationary contacts of the second single-pole four-throw switch are electrically connected to the R-phase terminal, the S-phase terminal, and the T-phase terminal, respectively. The fourth stationary contact of both the first and second single-pole four-throw switches is in the open position. The test switch includes six single-pole single-throw switches. The A-phase terminal, the B-phase terminal, and the C-phase terminal are each electrically connected to one test terminal of the insulation resistance tester through three single-pole single-throw switches. The R-phase terminal, the S-phase terminal, and the T-phase terminal are each electrically connected to another test terminal of the insulation resistance tester through three other single-pole single-throw switches.

3. The method of using a trailer-mounted live load transfer device according to claim 2, characterized in that, Methods for conducting continuity tests include: Select a phase path to be tested. The phase path starts from a phase conductor in the first bypass cable, passes through the corresponding closed phase contact in the bypass load switch (3), and ends at the corresponding phase conductor in the second bypass cable. Ensure that the phase contact in the bypass load switch (3) corresponding to the phase path to be tested is in the closed state; Operate the first single-pole four-throw switch to connect one input terminal of the continuity test indicator to the test terminal corresponding to the starting point of the path of the phase under test. Operate the second single-pole four-throw switch to connect the other input terminal of the test indicator to the test terminal corresponding to the end point of the path of the phase under test; Activate the continuity test indicator to detect and confirm the electrical continuity status of the selected phase path under test.

4. The method of using a trailer-mounted live load transfer device according to claim 2, characterized in that, Methods for conducting insulation tests include: Based on the preset insulation test items, determine the first and second test points of the insulation path to be tested. The preset insulation test items are: phase-to-phase insulation test, phase-to-ground insulation test, or bypass load switch break insulation test. If a bypass load switch break insulation test is performed, ensure that the corresponding phase contact of the bypass load switch (3) that constitutes part of the insulation path to be tested is in the open state; Operate the test selector switch to connect the first test point to a test terminal of the insulation resistance tester; If the second test point is a single-phase terminal, operate the test changeover switch to connect the second test point to the other test terminal of the insulation resistance tester; or, if the second test point is a grounding reference point, directly connect the other test terminal of the insulation resistance tester to the grounding reference point. Ensure that other phase terminals not involved in the current specific insulation test path are kept disconnected from both test terminals of the insulation resistance tester through their respective single-pole single-throw switches; Start the insulation resistance tester, apply a preset test voltage between the first test point and the second test point, and measure the insulation resistance value between them; in, When performing phase-to-phase insulation testing or bypass load switch break insulation testing, the first test point is selected from one of the A-phase terminal, B-phase terminal, C-phase terminal, R-phase terminal, S-phase terminal, or T-phase terminal, and the second test point is selected from another of the A-phase terminal, B-phase terminal, C-phase terminal, R-phase terminal, S-phase terminal, or T-phase terminal, which is different from the first test point. When performing a relative-to-ground insulation test, the first test point is selected from one of the A-phase terminal, B-phase terminal, C-phase terminal, R-phase terminal, S-phase terminal, or T-phase terminal, and the second test point is the grounding reference point of the towed live load transfer device.

5. The method of using a trailer-mounted live load transfer device according to claim 2, characterized in that, Methods for establishing adaptive insulation degradation prediction models include: Define state variables that characterize the insulation performance of the target insulation component. Establish a system to describe state variables. Basic model of insulation degradation over time ,in, For the first The time point of this test This represents the initial or baseline health status value of the insulating components. This is a cumulative degradation function, used to describe the time point up to the deadline. From parameter vector and operating stress The amount of decline in health status caused by the combined effects; For inclusion A parameter vector of model parameters; For the number of deployments Cumulative load time Current load experienced A vector set of environmental conditions; This represents the uncertainty term of the model error; Initialize parameter vector Prior probability distribution ; After obtaining the number State variables of insulation performance of the new target insulation component Actual observations and the corresponding operating stress Then, perform the following parameter update steps to achieve model adaptability: Based on the basic insulation degradation model and newly acquired data, the likelihood function is defined. This likelihood function quantifies the likelihood of a given model parameter vector. Operating stress Initial or baseline health status values and cumulative degradation function Under these conditions, test data were observed. The probability of; Applying Bayes' theorem, combined with the aforementioned prior probability distribution and likelihood function The parameter vector is calculated and updated. posterior probability distribution , ,in, Proportional to; Using the updated posterior probability distribution The statistics are used as parameter vectors The current optimal estimate is used to update and obtain the adaptive insulation degradation prediction model.

6. The method of using a trailer-mounted live load transfer device according to claim 2, characterized in that, The cable winding and unwinding mechanism (2) is of two types, and the cable winding and unwinding mechanism (2) includes: The optical axis (2-15) and bearing assembly, wherein the two ends of the optical axis (2-15) are rotatably connected to the container (1) through the bearing assembly; A cable reel (2-10) is used to wind the corresponding bypass cable, and the cable reel (2-10) is coaxially fixed on the optical axis (2-15); A drive unit is fixed inside the container (1), and the drive unit is connected to the optical axis (2-15) and is used to drive the optical axis (2-15) to rotate the cable reel (2-10); The cable reel (2-10) is provided with a pin (2-11) on its outer side, and the container (1) is provided with a fixing plate (2-12) that is compatible with the pin (2-11). The pin (2-11) selectively engages with the fixing plate (2-12), and locks the cable reel (2-10) when the pin (2-11) engages with the fixing plate (2-12), and releases the lock on the cable reel (2-10) when the pin (2-11) is separated from the fixing plate (2-12). An insulating crossarm (5) is provided in the bypass cable lead-out area of ​​the container (1). The insulating crossarm (5) is used to support, guide or fix the corresponding bypass cable during the lead-out or retraction process.

7. The method of using a trailer-mounted live load transfer device according to claim 2, characterized in that, The bypass load switch (3) is installed inside the cabin (1) via a sliding mechanism, which is used to slide the bypass load switch (3) out to the outside of the cabin (1); The sliding mechanism includes: a heavy-duty slide rail bracket (3-1), a heavy-duty slide rail (3-2), and a support plate. The heavy-duty slide rail bracket (3-1) is fixedly connected to the internal structure of the container (1). The heavy-duty slide rail (3-2) is slidably connected to the heavy-duty slide rail bracket (3-1). The support plate is fixedly connected to the heavy-duty slide rail (3-2). The bypass load switch (3) is installed on the support plate.

8. The method of using a trailer-mounted live load transfer device according to claim 2, characterized in that, The bypass load switch (3) includes: Switch body; An electrically controlled operating mechanism, used to drive the movement of the main contacts; At least one voltage sensor and at least one current sensor, configured to monitor voltage and current values ​​passing through a bypass circuit; At least one temperature sensor is configured to monitor the temperature of the bypass load switch (3) body or its connecting components; and The data processing and forwarding module is electrically connected to the voltage sensor, the current sensor and the temperature sensor, and is used to collect and process monitoring data, and forward the monitoring data to external devices through a communication interface.

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