Transformer test wiring auxiliary device

Abstract

According to the transformer test wiring auxiliary device provided by the invention, the wiring module leads down a main transformer bushing, an end screen and other leads, the wire changing module realizes rapid switching of different wiring modes, the base module provides physical support for the device and is compatible with a test instrument interface, and the monitoring module monitors the residual charge quantity of the device in real time to guarantee the overall safety performance. The wiring time in the transformer test process is effectively shortened, and the test efficiency is improved; the device comprises a wiring module, a base module, a wire changing module and a monitoring module, the wiring module comprises a wire clamp and an insulated wire, and the wire clamp is electrically connected with the insulated wire; the base module comprises an interface and a shell, and the interface extends to the outer side of the shell; the wire changing module comprises a sleeve and a guide rod, the guide rod is sleeved with the sleeve, the guide rod is connected with an insulated wire, and the sleeve is arranged above the shell; the monitoring module comprises a monitoring device, a display device and a power supply device. The power supply device is electrically connected with the monitoring device and the display device.

Description

Technical Field

[0001] This invention relates to the field of transformer testing technology, and more specifically to auxiliary devices for transformer testing wiring. Background Technology

[0002] The main characteristics of transformer testing include high-altitude testing, wire changing, and testing instruments. In traditional transformer testing methods, the number of times workers climb up the transformer equals the number of test items. During wire changing, workers must move back and forth between phases A, B, C, and N to complete the changes. Similarly, in traditional transformer testing methods, the number of times workers climb down the transformer equals the number of test items.

[0003] In traditional transformer testing, the following issues increase the testing time:

[0004] First, transformers with voltage levels of 35kV and above are installed at a height of 3m, which is considered high-altitude work. Safety belts must be worn when performing wiring operations. However, it is inconvenient for test personnel to move after wearing safety belts, and the space on top of the transformer is narrow, which makes the wiring modification time too long.

[0005] Secondly, the different test items and wiring positions during the testing process lead to frequent wiring changes. These frequent changes not only increase the complexity of the test but also waste time. In particular, in traditional methods, each wiring change requires test personnel to climb up and down the transformer, which not only increases the risk of the operation but also further extends the total test time.

[0006] Third, during the test, the test personnel are not allowed to stay on the transformer and need to go up and down the transformer once, which not only wastes time but also increases the risk.

[0007] Based on the above technical problems, this invention proposes that by adopting a wiring auxiliary device, all tests can be completed by climbing down the transformer only once. The transformer test wiring auxiliary device can control the transformer test wiring time within 40 minutes during the test, effectively shortening the test duration and significantly reducing the risk of workers climbing to heights and alleviating their labor intensity. The developed transformer test wiring auxiliary device is simple to operate, low in cost, and easy to use, making it suitable for every company. It provides the power industry with a convenient and reliable transformer test wiring auxiliary device. It effectively shortens the wiring time during transformer testing, improves test efficiency, and enhances the coordination and cooperation efficiency of various work teams. Summary of the Invention

[0008] This invention aims to address the technical deficiencies of existing technologies by providing a transformer testing wiring auxiliary device. The wiring module leads down the main transformer bushings, end screens, and other leads, the wire switching module enables rapid switching between different wiring methods, the base module provides physical support for the device and compatible interfaces for testing instruments, and the monitoring module monitors the residual charge of the device in real time to ensure overall safety performance. This effectively shortens the wiring time during transformer testing and improves testing efficiency.

[0009] This invention provides the following technical solution: a transformer test wiring auxiliary device, including a wiring module, a base module, a line-changing module, and a monitoring module;

[0010] The wiring module includes a wire clamp and an insulated wire, wherein the wire clamp is electrically connected to the insulated wire;

[0011] The base module includes an interface and a housing, with the interface extending to the outside of the housing;

[0012] The line-changing module includes a sleeve and a guide rod. The sleeve is fitted over the outside of the guide rod, and the guide rod is connected to an insulated wire. The sleeve is positioned above the housing.

[0013] The monitoring module includes a monitoring device, a display device, and a power supply device, wherein the power supply device is electrically connected to the monitoring device and the display device respectively.

[0014] Preferably, there are 8 interfaces. One end of each of the 8 interfaces is electrically connected to the high-voltage side and low-voltage side of the transformer's A-phase, B-phase, C-phase, and N-phase, respectively. The other end of each of the 8 interfaces is used to connect to a test bench for transformer testing.

[0015] Preferably, the interface further includes a grounding interface.

[0016] Preferably, the eight interfaces include A, a, B, b, C, c, N, and O.

[0017] Preferably, the display device is a digital ammeter.

[0018] Preferably, the monitoring device is a through-type current transformer, which includes CT1, CT2, and CT3. The connection lines between the A interface and the high-voltage side of phase A, and between the a interface and the low-voltage side of phase A, all pass through CT1. The connection lines between the B interface and the high-voltage side of phase B, and between the b interface and the low-voltage side of phase B, all pass through CT2. The connection lines between the C interface and the high-voltage side of phase C, and between the c interface and the low-voltage side of phase C, all pass through CT3. One end of each of CT1, CT2, and CT3 is connected to the input terminal of a digital display ammeter, and the other end of each is grounded. The output terminal of the digital display ammeter is grounded.

[0019] Preferably, a shielding layer is installed inside the insulated wire.

[0020] Preferably, the interface is a banana-type interface.

[0021] Preferably, the power supply device is a lithium battery.

[0022] Preferably, the bottom of the housing is provided with retractable rollers, and the upper side of the housing is provided with a cover.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention discloses a transformer test wiring auxiliary device, which aims to simplify the wiring, wire replacement and monitoring steps in the transformer test process, thereby improving test efficiency, reducing operational risks and reducing the workload of personnel. The device consists of four core parts: a wiring module, a base module, a wire replacement module and a monitoring module. Each part works together to achieve efficient and safe test wiring operations.

[0026] The wiring module is the foundation of the device, responsible for the electrical connection between the testing equipment and the transformer. The wiring module includes a clamp module and an insulated wire module. By selecting appropriate specifications and materials for the clamps and wire assemblies, the transformer test leads are safely and reliably connected to the wiring auxiliary device. The insulated wire is electrically connected to the clamp, forming an electrical path between the testing equipment and the transformer. The length and specifications of the wire can be customized according to actual needs to meet the requirements of different testing projects. The insulated wire achieves a reliable connection to the transformer bushing through the clamp, therefore the clamp needs to have good wear resistance.

[0027] The base module provides stable support and electrical interfaces for the device. The interfaces adopt a standardized design, which facilitates connection with different models of test equipment. The interfaces are equipped with electrical protection mechanisms to prevent abnormal conditions such as electrical short circuits and overloads. The housing is made of high-strength, corrosion-resistant materials, which have excellent protective performance and durability. The housing contains electrical components and wiring to provide a stable electrical environment for the device.

[0028] The wire-changing module is a transitional connection between the wiring module and the base module. It consists of two parts: an insulating sleeve and a guide rod. The insulating sleeve provides support and insulation for the wires and the guide rod, while the guide rod enables reliable connection of the test wiring and quick switching of the wiring method. The guide rod connects the insulated wires to form the electrical path of the wire-changing module. The design of the guide rod facilitates sliding within the sleeve, enabling quick replacement of the insulated wires.

[0029] The monitoring module is responsible for real-time monitoring of electrical parameters and equipment status during the test to ensure the safety and accuracy of the test; it mainly involves monitoring residual charge and ensuring safety; the power supply unit provides a stable power supply to the monitoring module; the display device adopts a high-resolution, high-contrast display screen to display the electrical parameters and equipment status collected by the monitoring device in real time. The design of the display device facilitates the observation and analysis of test data by test personnel, thereby improving the accuracy and reliability of the test.

[0030] In summary, the wiring module leads down the main transformer bushings, end screens, and other leads; the line-changing module enables rapid switching between different wiring methods; the base module provides physical support for the device and compatible interfaces for testing instruments; and the monitoring module monitors the residual charge of the device in real time to ensure overall safety. This transformer test wiring auxiliary device, through the coordinated work of these four modules, achieves efficient and safe test wiring operations. The device's design facilitates quick and accurate completion of wiring, line-changing, and monitoring tasks by test personnel, improving test efficiency and accuracy. Furthermore, the device possesses excellent protective performance and durability, meeting the needs of various test projects. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 for Figure 1 The front view;

[0033] Figure 3 for Figure 1 Side view;

[0034] Figure 4 This is the wiring diagram for the present invention;

[0035] Figure 5 This is a top view of a specific embodiment of the present invention;

[0036] Figure 6 for Figure 5 Side view;

[0037] Figure 7 The wiring procedure for traditional transformer testing;

[0038] Figure 8 The physical object of the present invention Figure 1 ;

[0039] Figure 9 The physical object of the present invention Figure 2 .

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Wiring module; 2. Cable replacement module; 3. Base module; 4. Monitoring module;

[0042] 101. Wire clamp; 102. Insulated wire;

[0043] 201. Sleeve; 202. Guide rod;

[0044] 301. Interface; 302. Housing;

[0045] 401. Display device. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] like Figures 1-9 As shown, it illustrates a specific embodiment of the present invention: as Figures 1-9 As shown, the transformer test wiring auxiliary device disclosed in this invention includes a wiring module 1, a base module 3, a wire changing module 2, and a monitoring module 4.

[0048] Wiring module 1 includes a wire clamp 101 and an insulated wire 102, wherein the wire clamp 101 is electrically connected to the insulated wire 102;

[0049] The base module 3 includes an interface 301 and a housing 302, wherein the interface 301 extends to the outside of the housing 302;

[0050] The line switching module 2 includes a sleeve 201 and a guide rod 202. The sleeve 201 is sleeved on the outside of the guide rod 202. The guide rod 202 is connected to an insulated wire 102. The sleeve 201 is located above the housing.

[0051] The monitoring module 4 includes a monitoring device, a display device 401, and a power supply device, wherein the power supply device is electrically connected to the monitoring device and the display device 401 respectively.

[0052] like Figure 7 As shown, in traditional transformer testing methods, the number of times workers climb up the transformer equals the number of test items, and during wiring, workers must move back and forth between phases A, B, C, and O to change the wiring. However, with the wiring assistance device of this invention, all tests can be completed by climbing down the transformer only once.

[0053] As shown in Table 1, five transformers of different voltage levels from five substations randomly selected from those under the jurisdiction of Urumqi were subjected to a complete routine test. The test wiring process, including "personnel climbing the transformer to connect wires" and "wire replacement for test item changes," was simulated under transformer de-energized conditions. It can be seen that the target value for test wiring time is ≤40 minutes. Optimizing the preparation of transformer maintenance and testing tools and the wiring time reduces the wiring time from the original 110 minutes to less than 40 minutes, further compressing power outage maintenance time, improving work efficiency, and reducing grid operation risks.

[0054] Table 1:

[0055]

[0056] The bushing serves as insulation and support for the wiring. During testing, it must withstand the maximum voltage and current specified in the test program. The team members assessed its insulation capability through the maximum withstand voltage and the maximum stress that its outer casing material could withstand through torsional strength. Meanwhile, considering that the weight and clearance of the bushing are limited by the support capacity and surface area of ​​the base module, its weight and minimum arc distance should be minimized.

[0057] Insulated wires, composed of metallic conductors, function to connect the device under test (DUT) to wiring aids. In practical use, wires are frequently bent, so the allowable bending radius is a key consideration. Furthermore, external interference significantly impacts test results, necessitating good shielding effectiveness. Therefore, the allowable bending radius and shielding effectiveness are crucial selection criteria. Considering actual test conditions, the wire should also possess sufficient tensile strength, temperature resistance, and a minimum maximum DC resistance at standard room temperature. The selection criteria in this invention are as follows:

[0058] 1. The allowable bending radius of the cable is >12.

[0059] 2. Shielding effectiveness > 25dB;

[0060] 3. The maximum DC resistance of the conductor at 20℃ is <0.8Ω / km;

[0061] 4. Maximum heat resistance temperature > 100℃;

[0062] 5. Tensile strength > 100N.

[0063] Based on the above selection criteria, AGR-10, FRT-10, and YTE-10 were compared in this invention. During the test, wires with different radii were bent (starting from 25mm and increasing by 5mm each time until 100mm), and their allowable bending radii were recorded. Sixteen sets of data were recorded. After experimental verification, FRT-10 wire had the best performance with an allowable bending radius > 15, while YTE-10 wire had the worst performance with an allowable bending radius > 10.

[0064] The shielding effectiveness of FRT-10 conductors ranges from 30dB to 85dB, which is considered excellent. AGR-10 conductors have the worst shielding effectiveness.

[0065] AGR-10 has the lowest maximum DC resistance at 20℃, the highest maximum heat resistance temperature, and FRT-10 has the best tensile strength.

[0066] When selecting conductors, comparative analysis of various parameters revealed that although the FRT-10 conductor had the lowest temperature tolerance, it could still meet the test conditions. It also had the largest allowable bending radius, the best shielding effectiveness, and the highest tensile strength. Therefore, the FRT-10 conductor was selected as the final solution.

[0067] Preferred, such as Figure 6 As shown, there are 8 interfaces 301. One end of each of the 8 interfaces 301 is electrically connected to the high-voltage side and low-voltage side of the transformer's A phase, B phase, C phase, and N phase, respectively. The other end of each of the 8 interfaces 301 is used to connect to a test bench for transformer testing.

[0068] In the transformer test wiring auxiliary device, the design of interface 301 is a key part of connecting the transformer and the test bench.

[0069] There are a total of 8 interfaces 301 in the base module 3. This design is to meet the electrical connection requirements during the transformer test process, so as to facilitate quick identification and operation by the test personnel, and to ensure the stability and safety of the electrical connection.

[0070] Electrical connections to the transformer during testing: One end of each of the eight interfaces 301 is electrically connected to the high-voltage and low-voltage sides of the transformer's A-phase, B-phase, C-phase, and N-phase (neutral line), respectively. This design allows test personnel to directly connect to different phases and voltage levels of the transformer via the interfaces, eliminating the need for complex wiring operations on the transformer, thereby improving testing efficiency and safety.

[0071] Phase A high-voltage side, Phase B high-voltage side, and Phase C high-voltage side: These are the three phases of the high-voltage side of the transformer, respectively.

[0072] Phase A low-voltage side, Phase B low-voltage side, and Phase C low-voltage side: These are connected to the three phases of the transformer's low-voltage side, respectively.

[0073] N-phase high-voltage side and O-phase low-voltage side: These are the neutral lines connected to the high-voltage and low-voltage sides of the transformer, respectively.

[0074] Connection to the test bench: The other end of the 8-port 301 is used to connect to the test bench for transformer testing. All tests can be completed by climbing down the transformer only once. During the test, the wiring time for transformer testing is controlled within 40 minutes, which can effectively shorten the test time, greatly reduce the risk of workers climbing to heights, reduce the labor intensity of workers, and improve the efficiency of the test.

[0075] Short circuits and open circuits at A, B, C, and N are achieved manually using wire clamps.

[0076] In summary, by rationally configuring eight interfaces and electrically connecting them to the high-voltage and low-voltage sides of the transformer's A, B, C, and N phases, as well as connecting them to a test bench, this device achieves efficient and safe transformer testing wiring operations. Furthermore, the interface design also considers safety and protection factors, as well as ease of labeling and operation. Corresponding phase markings are placed below the interfaces, providing test personnel with a more reliable and convenient testing environment.

[0077] Preferred, such as Figure 6 As shown, the interface 301 also includes a grounding interface.

[0078] A grounding interface is installed in the transformer test wiring auxiliary device, which further enhances the safety and reliability of the device.

[0079] In transformer testing, grounding interfaces not only ensure electrical safety during the testing process but also effectively prevent electrical faults from damaging equipment and personnel, ensuring reliable grounding during testing. Grounding interfaces should be clearly labeled for quick identification and operation by testing personnel.

[0080] Preferred, such as Figure 6 As shown, the eight interfaces 301 include A, a, B, b, C, c, N, and O.

[0081] In the transformer test wiring auxiliary device, the 8 interfaces are labeled A, a, B, b, C, c, N, and O;

[0082] Interfaces A and a connect to phase A of the high-voltage and low-voltage sides of the transformer, respectively. During transformer testing, the electrical performance of the high-voltage and low-voltage sides needs to be tested separately; therefore, interfaces A and a are used for these two testing phases. Through interfaces A and a, the test bench can provide the required test voltage and current to the high-voltage and low-voltage phase A of the transformer and monitor their electrical performance.

[0083] The B and b interfaces and the C and c interfaces are similar to the A and a interfaces. They are used to test the electrical performance of phases B and C in transformer tests. Testers obtain electrical performance data of phases B and C on the high-voltage and low-voltage sides of the transformer through the test bench to evaluate the overall performance of the transformer.

[0084] The N and O interfaces connect the high-voltage and low-voltage sides of the transformer's neutral line (N line). In a three-phase power system, the neutral line provides voltage balance and a current return path. Through the N and O interfaces, the test bench can monitor the transformer's neutral line current and voltage to evaluate the transformer's neutral point grounding performance and current balance.

[0085] In summary, the eight interfaces 301 (A, a, B, b, C, c, N, O) in the transformer test wiring auxiliary device are respectively connected to the three phases (A, B, C phases) of the high-voltage side and the low-voltage side of the transformer, as well as the neutral line (N line), to ensure electrical safety. Through these interfaces, the test bench can provide the required test voltage and current to the transformer and monitor its electrical performance, thereby evaluating the overall performance and safety of the transformer.

[0086] Preferably, the display device 401 is a digital ammeter.

[0087] The display device is used to intuitively show the current value detected by the monitoring device, facilitating data reading at the work site. Therefore, the detection module is required to have high voltage tolerance, short response time, and also needs certain environmental adaptability and appropriate power consumption. This invention compares and analyzes digital display meters from three manufacturers on the market according to experimental requirements.

[0088] Selection criteria: 1. Withstand voltage ≥ 4kV; 2. Response time ≤ 150ms; 3. Power consumption ≤ 10W; 4. Operating temperature meets -10℃~50℃; 5. Unit price ≤ 200 yuan / unit. After testing and comparing three types of digital display meters on the market, the digital display meter with advantages such as high withstand voltage, short response time, and strong adaptability to ambient temperature was selected.

[0089] Preferred, such as Figure 4 As shown, the monitoring device is a through-type current transformer, which includes CT1, CT2, and CT3. The connection lines between the A interface and the high-voltage side of phase A, and between the a interface and the low-voltage side of phase A, all pass through CT1. The connection lines between the B interface and the high-voltage side of phase B, and between the b interface and the low-voltage side of phase B, all pass through CT2. The connection lines between the C interface and the high-voltage side of phase C, and between the c interface and the low-voltage side of phase C, all pass through CT3. One end of each of CT1, CT2, and CT3 is connected to the input terminal of a digital display ammeter, and the other end of each is grounded. The output terminal of the digital display ammeter is grounded.

[0090] A through-core current transformer is a special type of current transformer. Its structure does not have a primary winding; the current-carrying (load current) conductor passes through a circular (or other shaped) iron core made of rolled silicon steel sheets, which acts as the primary winding. The secondary winding is directly and evenly wound on the circular iron core and connected in series with the secondary load of the current coils of instruments, relays, transmitters, etc., to form a closed loop. Because there is no primary winding, its transformation ratio is determined by the number of turns of the primary winding passing through the transformer's iron core. The more turns, the smaller the transformation ratio; conversely, the fewer turns, the larger the transformation ratio. Through-core current transformers have advantages such as high thermal stability current, good insulation performance, low price, and high accuracy.

[0091] Connection method of through-type current transformers CT1, CT2, and CT3

[0092] CT1 Connection: The connection line between the A interface and the high voltage side of phase A passes through the center hole of CT1.

[0093] The connection line between interface a and the low-voltage side of phase A also passes through the center hole of CT1.

[0094] One end of CT1 is connected to the input terminal of a digital ammeter to transmit the electromagnetic induction signal generated by the current.

[0095] The other end of CT1 is grounded.

[0096] CT2 connection:

[0097] The connection line between the B interface and the high-voltage side of phase B passes through the center hole of CT2.

[0098] The connection line between the b interface and the low-voltage side of phase B also passes through the center hole of CT2.

[0099] One end of CT2 is also connected to the input terminal of the digital display ammeter, similar to CT1, and is used to transmit electromagnetic induction signals.

[0100] The other end of CT2 is also grounded.

[0101] CT3 connection:

[0102] The connection wire between the C-interface and the high-voltage side of the C-phase passes through the center hole of CT3.

[0103] The connection wire between the C-type interface and the low-voltage side of the C-phase also passes through the center hole of the CT3.

[0104] One end of CT3 is connected to the input terminal of a digital ammeter for transmitting current signals.

[0105] The other end of CT3 is also grounded.

[0106] The input terminals of the digital ammeter are connected to one end of CT1, CT2, and CT3 respectively, and are used to receive the electromagnetic induction signals transmitted by the through-type current transformer.

[0107] Output connection: The output terminal of the digital ammeter is grounded to ensure the integrity of the current signal loop.

[0108] Working principle: When the currents of phases A, B, and C flow through CT1, CT2, and CT3 respectively, electromagnetic induction is generated in the current transformers, thus generating current signals proportional to the current. These signals are transmitted to the digital display ammeter, processed, and displayed.

[0109] In summary, the connection between the through-type current transformers CT1, CT2, and CT3 and the digital ammeter is achieved by passing the connecting wires of each phase through the corresponding center holes of the transformers and connecting the output terminals of the transformers to the input terminals of the ammeters. Through current conversion, a large current is transformed into a smaller current, allowing for a direct and accurate determination of leakage current data. This connection method enables accurate measurement of current values, which are then displayed on the digital ammeter, providing real-time monitoring of the residual charge in the device and ensuring overall safety performance.

[0110] Preferably, the insulated wire 102 is equipped with a shielding layer inside.

[0111] Insulated conductor 102 is an electrical wire with an insulation layer used to transmit electrical energy or signals. The shielding layer inside the conductor is added to improve its electromagnetic shielding effectiveness, reduce interference from external electromagnetic fields on the signals or currents inside the conductor, and also reduce the impact of electromagnetic radiation generated by the conductor itself on the surrounding environment.

[0112] The shielding layer effectively prevents external electromagnetic fields from entering the conductor, protecting internal signals or currents from interference. Simultaneously, the shielding layer reduces electromagnetic radiation generated by the conductor itself, minimizing electromagnetic pollution to the surrounding environment.

[0113] The shielding layer is typically made of conductive materials (such as copper or aluminum), forming a conductive barrier that guides external electromagnetic fields along the shielding layer instead of penetrating the conductor's interior. When an external electromagnetic field attempts to enter the conductor, it induces a current in the shielding layer. This induced current generates a magnetic field in the opposite direction to the original electromagnetic field, thus counteracting the original electromagnetic field's influence on the conductor's interior.

[0114] During the production of the insulated wire 102, a layer of conductive material (such as copper foil or tinned copper wire) is tightly wound around the surface of the wire to form a shielding layer. The shielding layer is isolated from the wire by an insulating material to ensure that the shielding layer does not interfere with the normal transmission of the wire.

[0115] By adding a shielding layer inside the conductor to optimize the shielding effectiveness, the shielding effectiveness of the conductor is between 30dB and 85dB after the modification, which meets the excellent shielding effectiveness level and is far greater than the target value at different frequencies.

[0116] In summary, adding a shielding layer inside the insulated conductor 102 is an effective modification that can significantly improve the conductor's electromagnetic shielding performance. This not only enhances the conductor's anti-interference capability and electromagnetic compatibility but also provides strong support for the stable operation of the power system.

[0117] Preferred, such as Figure 6 As shown, the interface 301 is a banana-type interface.

[0118] A shielding layer was added inside the conductor to optimize shielding effectiveness. After modification, the conductor's shielding effectiveness ranged from 30dB to 85dB, meeting the excellent shielding effectiveness level and significantly exceeding the target value at different frequencies. The selection of the interface in this invention was considered as follows:

[0119] 1. Tightening time ≤ 6 seconds;

[0120] 2. Contact resistance < 200μΩ;

[0121] 3. Tensile strength > 4 MPa;

[0122] The test compared banana-type interfaces, blade interfaces, and clip interfaces. The banana-type interface had the highest tensile strength and performed best in terms of contact resistance and fastening time. Therefore, the banana-type interface was chosen as the final solution.

[0123] Preferably, the power supply device is a lithium battery.

[0124] To ensure the monitoring current requirements are met, the device needs a power supply. The team members adopted a battery-powered approach and conducted a comparative analysis based on factors such as the device's lightweight design and large battery capacity, while also taking into account factors such as energy density, lifespan, and unit price.

[0125] Selection criteria in this invention:

[0126] 1. Specific capacity ≥ 65 A·h / kg;

[0127] 2. Battery capacity ≥ 34A·h;

[0128] 3. Energy density ≥ 100Wh / kg;

[0129] 4. Service life ≥ 300 cycles;

[0130] 5. Unit price ≤ 50 yuan / piece;

[0131] After comparing the three types of batteries on the market—lead-acid batteries, lithium batteries, and nickel-metal hydride batteries—lithium batteries have the advantages of higher specific capacity and larger capacity. Moreover, their lifespan and energy density are superior to the other two types of batteries. Although the unit price is higher, the decision was made to choose lithium batteries after comprehensive consideration.

[0132] Preferably, the bottom of the housing 302 is provided with retractable rollers, and the upper side of the housing is provided with a cover.

[0133] The housing 302 is the main structure of the device of the present invention. It supports the various components inside the device and provides them with necessary protection and support. The design of the housing 302 needs to take into account multiple factors such as the weight, size, operating environment, and portability of the device.

[0134] At the bottom of housing 302, we have cleverly incorporated retractable rollers. These rollers are typically made of durable materials, such as rubber or metal, to ensure good friction and load-bearing capacity during movement.

[0135] The main function of the rollers is to facilitate the movement of the device. When it is necessary to move the device, simply extend the rollers from the bottom of the housing to easily push or pull the device, greatly reducing the burden of handling.

[0136] Retractable Feature: A retractable roller mechanism is designed so that when the device is stationary, the rollers can easily retract into the housing or bottom recess, making the device more stable and less prone to tipping over. The number and arrangement of the rollers are typically determined based on the weight and size of the device. Generally, at least two rollers are provided to ensure stability, while more rollers offer better mobility and balance.

[0137] On the upper side of housing 302, we have installed a cover. The main function of the cover is to protect the internal components of the device from external environmental factors such as dust, dirt, and moisture. This not only extends the service life of the device but also keeps its internal components clean and in normal working order.

[0138] In this invention, the rollers and the cover are designed to complement each other. The rollers make the device more convenient and portable when moving, while the cover protects the device from external environmental damage when not in use. This design not only improves the device's practicality and portability but also provides it with better protection and stability.

[0139] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. These changes involve related technologies well known to those skilled in the art, and all of them fall within the protection scope of the present invention.

[0140] Many other changes and modifications can be made without departing from the concept and scope of this invention. It should be understood that this invention is not limited to the specific embodiments, and the scope of this invention is defined by the appended claims.

Claims

1. Transformer test wiring auxiliary device, characterized in that: It comprises a wiring module (1), a base module (3), a line changing module (2), and a monitoring module (4); The wiring module (1) comprises a wire clamp (101) and an insulated wire (102), wherein the wire clamp (101) is electrically connected to the insulated wire (102); The base module (3) comprises an interface (301) and a shell (302), wherein the interface (301) extends to the outside of the shell (302); The line-changing module (2) comprises a sleeve (201) and a guide rod (202), wherein the sleeve (201) is sleeved on the outside of the guide rod (202), the guide rod (202) is connected to an insulated wire (102), and the sleeve (201) is arranged above the housing; The monitoring module (4) comprises a monitoring device, a display device (401) and a power supply device, wherein the power supply device is electrically connected to the monitoring device and the display device (401) respectively.

2. The transformer test wiring auxiliary device according to claim 1, characterized in that: The number of interfaces (301) is 8, one end of the 8 interfaces (301) is electrically connected to the high voltage side and the low voltage side of the A phase, B phase, C phase, and N phase of the transformer, respectively, and the other ends of the 8 interfaces (301) are used to connect to a test bench to perform transformer testing.

3. The transformer test wiring auxiliary device according to claim 2, characterized in that: The interface (301) also includes a grounding interface.

4. The transformer test wiring auxiliary device according to claim 3, characterized in that: The eight interfaces (301) include A, a, B, b, C, c, N, and O.

5. The transformer test wiring auxiliary device according to claim 3, characterized in that: The display device (401) is a digital display ammeter.

6. The transformer test wiring auxiliary device according to claim 4, characterized in that: The monitoring device is a through-type current transformer, which includes CT1, CT2, and CT3. The connecting lines between the A interface and the high-voltage side of the A phase, and the a interface and the low-voltage side of the A phase all pass through CT1, the connecting lines between the B interface and the high-voltage side of the B phase, and the b interface and the low-voltage side of the B phase all pass through CT2, and the connecting lines between the C interface and the high-voltage side of the C phase, and the c interface and the low-voltage side of the C phase all pass through CT3. One end of CT1, CT2, and CT3 is respectively connected to the input end of the digital ammeter, and the other ends thereof are all grounded. The output end of the digital ammeter is grounded.

7. The transformer test wiring auxiliary device according to any one of claims 1 to 6, characterized in that: A shielding layer is installed inside the insulated wire (102).

8. The transformer test wiring auxiliary device according to claim 7, characterized in that: The interface (301) is a banana-type interface.

9. The transformer test wiring auxiliary device according to claim 8, characterized in that: The power supply device is a lithium battery.

10. The transformer test wiring auxiliary device according to claim 1, characterized in that: A retractable roller is arranged at the bottom of the shell (302), and a shell cover is arranged at the upper side of the shell.

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