Emergency current limiting transformer

Abstract

The application relates to the rail transit technical field, in particular to an emergency choke transformer, which comprises a box body and a transformer, a handle is arranged on the box body, and a trundle is arranged at each corner of the bottom of the box body; the transformer comprises an iron core and a coil; the coil comprises a traction coil, a signal coil and a test coil, the number of turns of the traction coil and the signal coil is in a ratio of 1:24, the number of turns of the test coil is greater than that of the traction coil and smaller than that of the signal coil; the first traction terminal and the second traction terminal of the traction coil are connected with two guide rails respectively; and the first signal terminal and the second signal terminal of the signal coil are connected with an adapter and a circuit breaker. Through the arrangement of the trundles and the handle, the emergency response speed can be accelerated, and the fault processing time can be reduced in the case of emergency. Through the arrangement of the adapter and the circuit breaker, the adapter can be selectively connected between the first signal terminal and the second signal terminal, so that the emergency demand in multiple scenes can be met.

Description

Technical Field

[0001] This application relates to the field of rail transit technology, and in particular to an emergency choke transformer. Background Technology

[0002] Choke transformers are key components in electrified railway track circuit systems. They provide electrical isolation for the track circuits and simultaneously offer a reliable return path for traction current. Through their internal traction and signal coils, they separate the powerful power frequency traction current from the weak signal current on the shared track transmission medium, thus ensuring the accuracy and reliability of train operation control signal transmission.

[0003] Because they need to withstand traction currents of up to hundreds of amperes and possess sufficient electrical insulation strength and mechanical stability, traditional choke transformers are typically designed with large-section copper or aluminum windings, thick silicon steel sheet cores, and robust cast iron or steel casings, resulting in their large size and heavy weight. Transportation often requires multiple workers or the assistance of cranes, forklifts, and other mechanical equipment. In emergencies, rapid handling is difficult, leading to slow emergency response times and lengthy troubleshooting periods. Utility Model Content

[0004] To address the aforementioned problems, this application provides an emergency choke transformer.

[0005] To achieve the above objectives, this application adopts the following technical solution: According to one aspect of this application, an emergency choke transformer is provided, comprising: The box body is equipped with a handle, and casters are provided at each corner of the bottom of the box body; A transformer is disposed within the enclosure, the transformer comprising an iron core and coils wound around the iron core; The coil includes a traction coil, a signal coil, and a test coil. The turns ratio of the traction coil to the signal coil is 1:24. The number of turns of the test coil is greater than the number of turns of the traction coil and less than the number of turns of the signal coil. The traction coil has a first traction terminal and a second traction terminal, and the first traction terminal and the second traction terminal are respectively connected to two guide rails; The signal coil has a first signal terminal and a second signal terminal, and an adapter and a circuit breaker are sequentially connected between the first signal terminal and the second signal terminal. The test coil has a first test terminal and a second test terminal.

[0006] In one embodiment, a third traction terminal is also led out from the traction coil. The third traction terminal is used for traction return. The connection between the first traction terminal and the third traction terminal is a first traction coil, and the connection between the second traction terminal and the third traction terminal is a second traction coil. The first traction coil and the second traction coil have the same number of turns.

[0007] In one embodiment, the third traction terminal is connected to a midpoint connecting plate or a grounding grid.

[0008] In one embodiment, the turns ratio of the test coil to the signal coil is 1:4.

[0009] In one embodiment, the enclosure includes a housing and a cover plate, the housing has an opening at the top, the transformer is disposed inside the housing, and the cover plate is openable and closable on the housing to open or close the opening; The first traction terminal, the second traction terminal, the first signal terminal, the second signal terminal, the first test terminal, and the second test terminal all protrude from the housing.

[0010] In one embodiment, the cover plate includes a first portion and a second portion connected together, the first portion being used to cover the opening, and the second portion being used to cover the first traction terminal, the second traction terminal, the first signal terminal, the second signal terminal, the first test terminal, and the second test terminal.

[0011] In one embodiment, the first traction terminal, the second traction terminal, the first signal terminal, the second signal terminal, the first test terminal, and the second test terminal protrude from the same side of the housing.

[0012] In one embodiment, the transformer is further provided with a temperature detector, which is connected to a mobile device via wireless data transmission.

[0013] In one embodiment, each side of the housing is provided with a fixing mechanism, which includes a fixing seat and a locking member. The fixing seat is disposed on the housing, and the locking member is threadedly engaged with the fixing seat to adjust its relative height on the housing.

[0014] In one embodiment, the housing is made of aluminum.

[0015] The emergency choke transformer provided in this application embodiment, through selective connection of the adapter, allows the transformer to be adapted to all types of chokes in conventional railway stations and sections, as well as all types of chokes in passenger dedicated railway stations and sections, meeting the usage needs of emergency choke transformers in multiple scenarios. Emergency operation can be achieved with a single device, reducing costs. The handle and casters allow the housing to be moved to any position, thereby moving the transformer to any location. This enables rapid transport in emergency situations, speeding up emergency response, reducing fault handling time, and meeting the usage needs of different locations on different railway tracks. Attached Figure Description

[0016] Figure 1 This illustration shows a structural schematic diagram of an emergency choke transformer provided in an embodiment of this application; Figure 2 Show Figure 1 Side view; Figure 3 This illustration shows a structural diagram of the housing in an emergency choke transformer according to an embodiment of this application; Figure 4 Show Figure 3 Top view; Figure 5 This illustration shows a structural diagram of a transformer in an emergency choke transformer provided in an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1. Housing; 11. Shell; 111. Opening; 12. Cover; 121. First part; 122. Second part; 2. Handle; 3. Casters; 4. Transformer; 41. Iron core; 42. Traction coil; 421. First traction coil; 422. Second traction coil; 43. Signal coil; 44. Test coil; 45. First traction terminal; 46. Second traction terminal; 47. First signal terminal; 48. Second signal terminal; 49. Adapter; 410. Circuit breaker; 411. First test terminal; 412. Second test terminal; 413. Third signal terminal; 5. Temperature detector; 6. Fixing mechanism; 61. Fixing base; 62. Locking element. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0021] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figures 1-5 As shown, this embodiment provides an emergency choke transformer, including a housing 1 and a transformer 4. The housing 1 is provided with a handle 2, and casters 3 are provided at each corner of the bottom of the housing 1. The transformer 4 is disposed inside the housing 1 and includes an iron core 41 and a coil wound on the iron core 41. The coil includes a traction coil 42, a signal coil 43, and a test coil 44. The turns ratio of the traction coil 42 and the signal coil 43 is 1:24. The number of turns of the test coil 44 is greater than the number of turns of the traction coil 42 and less than the number of turns of the signal coil 43. The traction coil 42 has a first traction terminal 45 and a second traction terminal 46, which are respectively connected to two guide rails. The signal coil 43 has a first signal terminal 47 and a second signal terminal 48. An adapter 49 and a circuit breaker 410 are sequentially connected between the first signal terminal 47 and the second signal terminal 48. The test coil 44 has a first test terminal 411 and a second test terminal 412.

[0023] Transformer 4 is installed inside housing 1. With handle 2 and casters 3, housing 1 can be moved to any position, and thus transformer 4 can be moved to any position, thereby meeting the usage needs of different positions on different railway tracks in emergency situations.

[0024] By setting the turns ratio of traction coil 42 and signal coil 43 to 1:24, efficient impedance matching can be achieved between traction current and signal current, ensuring both the high current transmission capacity of the traction circuit and the sensitivity and stability of the signal circuit, thereby improving the overall adaptability and reliability of transformer 4 under complex operating conditions.

[0025] The test coil 44 is configured for testing and monitoring the current state of the signal loop. The traction coil 42 is used to transmit a large traction current and has fewer turns to reduce impedance. The test coil 44 is used to induce a signal in the traction magnetic field. If its number of turns is less than or equal to that of the already small traction coil 42, the induced voltage signal will be too weak and easily drowned out by noise. Therefore, to ensure that the test coil 44 can couple a sufficiently strong voltage signal from the traction magnetic field, allowing the measuring instruments connected to the first test terminal 411 and the second test terminal 412 to obtain clear and readable measurement values, the number of turns of the test coil 44 is set to be greater than that of the traction coil 42. The measuring instruments include a multimeter or oscilloscope, etc.

[0026] Furthermore, the signal coil 43 has the maximum number of turns, generating high impedance to prevent traction current from entering the signaling equipment. Under the same magnetic flux, the voltage induced in the winding is proportional to its number of turns. The test coil 44 and the signal coil 43 use the same core 41 magnetic circuit. Therefore, by setting the number of turns in the test coil 44 to be less than that in the signal coil 43, when a higher voltage is induced in the signal coil 43, a proportionally reduced signal within a safe voltage range can be induced in the test coil 44. This effectively prevents high voltage from appearing on the first test terminal 411 and the second test terminal 412, ensuring the safety of maintenance personnel.

[0027] Optionally, the turns ratio of the test coil 44 to the signal coil 43 is 1:4. Thus, the test coil 44 can obtain a signal of sufficient strength from the traction coil 42 side for monitoring, and the voltage can be limited to a safe range by the signal coil 43.

[0028] In this embodiment, the traction coil 42 has 16 turns, the signal coil 43 has 384 turns, and the test coil 44 has 96 turns.

[0029] like Figures 1-5 As shown, in some embodiments, the first traction terminal 45 and the second traction terminal 46 are respectively connected to two guide rails, ensuring that the traction current can smoothly pass through the rails to form a loop, effectively reducing the loop impedance and reducing power loss.

[0030] The signal coil 43 has a first signal terminal 47 and a second signal terminal 48. An adapter 49 and a circuit breaker 410 are connected sequentially between the first signal terminal 47 and the second signal terminal 48. The adapter 49 is used to match the impedance of the signal equipment to ensure signal transmission quality; the circuit breaker 410 provides overcurrent protection, which can quickly disconnect the circuit when an abnormal current occurs in the signal circuit to prevent equipment damage, thereby enhancing the safety and reliability of the system. In addition, the circuit breaker 410 can also enable selective connection of the adapter 49.

[0031] For example, when applied to a section of a conventional railway station, transformer 4 needs to handle two frequencies of signals simultaneously: one is a 50Hz traction return current, which needs to pass smoothly with low impedance; the other is a 25Hz signal current, which needs to be extracted and sent to the track relay, while preventing the 50Hz current from interfering with the relay. In this case, adapter 49 inside transformer 4 can be connected to the circuit via circuit breaker 410, connected in series between signal coil 43 and track relay. Resonating at 50Hz, it presents extremely high impedance to the 50Hz current, effectively suppressing interference from the 50Hz traction current and ensuring the transmission of the 25Hz signal current.

[0032] When applied to sections of conventional railways and sections of passenger dedicated railways, adapter 49 is not required to work. In this case, adapter 49 can be disconnected from the circuit by circuit breaker 410.

[0033] Therefore, the transformer 4 can be adapted to all types of chokes in and between stations of conventional railways, as well as all types of chokes in and between stations of passenger dedicated railways, meeting the needs of emergency choke transformers in multiple scenarios. Emergency operation can be achieved through a single device, reducing costs.

[0034] In some embodiments, a third traction terminal is also led out from the traction coil 42. The third traction terminal is used for traction return current. The connection between the first traction terminal 45 and the third traction terminal is the first traction coil 421, and the connection between the second traction terminal 46 and the third traction terminal is the second traction coil 422. The first traction coil 421 and the second traction coil 422 have the same number of turns. By setting a center tap on the traction coil 42 through the third traction terminal, the traction coil 42 is divided into two, providing two parallel paths with symmetrical impedance and consistent parameters for the traction return current from the two rails. This ensures that the traction current can be evenly distributed to the coils on both sides, thereby effectively suppressing the unbalanced current caused by the unbalanced return current of the two rails.

[0035] The first traction coil 421 has 8 turns, and the second traction coil 422 has 8 turns.

[0036] Experimental verification shows that the emergency choke transformer provided in this embodiment has an impedance of not less than 17Ω when a standard carrier frequency (1700Hz~2600Hz) signal voltage of the ZPW-2000 series (0.6V~8V) is applied to the traction coil 42. When the traction coil 42 carries a 50Hz, 50A current and a standard carrier frequency (1700Hz~2600Hz) signal voltage of the ZPW-2000 series (0.6V~8V) is applied to it, its impedance is not less than 17Ω.

[0037] The semi-traction coil 42, also known as the first traction coil 421 or the second traction coil 422, has an impedance of not less than 3Ω when subjected to a 50Hz, 400A current and a standard carrier frequency (1700Hz to 2600Hz) signal voltage of the ZPW-2000 series of 0.6V to 8V.

[0038] The voltage of traction coil 42 is no greater than 1.5V when passing a current of 50Hz and 50A.

[0039] The unbalance coefficient of traction coil 42 is no greater than 0.5%.

[0040] Under standard atmospheric conditions during testing, the insulation resistance between windings and between windings and the core 41 should be no less than 1000MΩ when tested with a 500V megohmmeter.

[0041] When the atmospheric pressure is not lower than 89.8 kPa (equivalent to an altitude of less than 1000 m), the windings and the winding-to-core 41 can withstand an AC sine wave of 50 Hz with an effective voltage of 2400 V for 1 minute without breakdown or surface flashover.

[0042] The third traction terminal is connected to the midpoint connecting plate or the grounding grid, thereby providing a stable and reliable reference potential for traction return current, further ensuring the safety and stability of the system grounding.

[0043] like Figures 1-5As shown, in some embodiments, the housing 1 includes a shell 11 and a cover plate 12. The shell 11 has an opening 111 at its top. The transformer 4 is disposed inside the shell 11. The cover plate 12 is openable and closable on the shell 11 to open or close the opening 111. The first traction terminal 45, the second traction terminal 46, the first signal terminal 47, the second signal terminal 48, the first test terminal 411, and the second test terminal 412 all protrude from the shell 11. The openable and closable design of the cover plate 12 facilitates the installation, inspection, and maintenance of the transformer 4 inside the shell 11. By having multiple terminals protrude from the shell 11, external cable connection operations can be completed without opening the housing 1, simplifying the wiring process and improving operational convenience and efficiency.

[0044] The cover plate 12 is movably mounted on the housing 11. Both ends of the cover plate 12 are connected to the housing 11 via two movable latches. When the opening 111 needs to be closed, the cover plate 12 is first placed over the opening 111 and then connected to the housing 11 via the latches. Alternatively, one end of the cover plate 12 may be rotatably connected to the housing 11, and the other end may be connected to the housing 11 via latches or screws. When the opening 111 needs to be closed, rotating the cover plate 12 will close it.

[0045] Of course, in order to ensure the safety of transformer 4, a latch can also be provided between cover plate 12 and housing 11. The latch is equipped with a device lock. Only by opening the device lock can cover plate 12 be opened and closed, so as to improve the safety of equipment use.

[0046] Optionally, the housing 1 is made of aluminum, which is lightweight, corrosion-resistant and has good heat dissipation, further reducing the overall weight and facilitating transportation. At the same time, its good heat dissipation performance helps to extend the service life of its internal transformer 4.

[0047] Furthermore, the cover plate 12 includes a first portion 121 and a second portion 122 connected to each other. The first portion 121 is used to cover the opening 111, and the second portion 122 is used to cover the first traction terminal 45, the second traction terminal 46, the first signal terminal 47, the second signal terminal 48, the first test terminal 411, and the second test terminal 412. The first portion 121 of the cover plate 12 is used to cover the opening 111 at the top of the housing 11, and the second portion 122 is used to cover all the protruding terminals. This allows for both covering and closing the opening 111, and also shielding the terminals. In special environments, such as rainy days, it can provide some rain protection.

[0048] Optionally, the first part 121 and the second part 122 are integrally formed, thereby ensuring the overall strength of the cover plate 12 and the stability of opening and closing.

[0049] Optionally, the first traction terminal 45, the second traction terminal 46, the first signal terminal 47, the second signal terminal 48, the first test terminal 411, and the second test terminal 412 protrude from the same side of the housing 11. This ensures that the external cable routing is uniform and neat, avoiding messy tangles and improving the aesthetics of the appearance. It also facilitates subsequent wiring and maintenance inspections.

[0050] In some embodiments, a temperature detector 5 is also provided on the transformer 4, and the temperature detector 5 is connected to a mobile device via wireless data transmission. The temperature detector 5 monitors the temperature of the transformer 4, and the wireless data transmission allows maintenance personnel to remotely and in real-time monitor the operating temperature of the transformer 4. This enables timely detection of abnormal temperature rises caused by overload or faults, providing an early warning function and preventing equipment damage due to overheating.

[0051] Wireless data transmission includes Bluetooth or Wi-Fi, and mobile devices include mobile phones, computers, monitors, or tablets.

[0052] In some embodiments, each side of the housing 1 is provided with a fixing mechanism 6. The fixing mechanism 6 includes a fixing base 61 and a locking member 62. The fixing base 61 is disposed on the housing 1, and the locking member 62 is threadedly engaged with the fixing base 61 to adjust its relative height on the housing 1. By rotating and adjusting the relative height of the locking member 62 on the housing 1, when the housing 1 is moved to a target position and needs to be fixed, the height of the locking member 62 can be adjusted to suspend the casters 3 in the air, while the bottom of the locking member 62 is fixed to the ground, thereby keeping the housing 1 stable. When transportation or movement is required, the locking member 62 can be rotated back, so that the casters 3 are on the ground and the locking member 62 is suspended in the air, thereby moving the housing 1 via the casters 3.

[0053] like Figures 1-5 As shown above, the emergency choke transformer provided in this embodiment has a housing 1 made of lightweight materials for easy transportation. The casters 3 and handle 2 allow for rapid movement, improving emergency response speed. Adjusting the height of the locking element 62 secures the housing 1 to the ground, effectively preventing accidental movement during use. The temperature detector 5 on the transformer 4 is wirelessly connected to a mobile device, enabling remote real-time monitoring of the transformer 4's operating temperature and facilitating predictive maintenance.

[0054] The transformer 4 housed within housing 1 includes an iron core 41 and a traction coil 42, a signal coil 43, and a test coil 44 wound around it. The turns ratio of the traction coil 42 to the signal coil 43 is set to 1:24, achieving impedance matching between the traction and signal circuits. This ensures both smooth flow of traction current and stable signal transmission. The test coil 44 has more turns than the traction coil 42 but fewer turns than the signal coil 43. This allows it to induce a sufficiently strong signal from the main magnetic circuit for measurement, while limiting the induced voltage within a safe range, thus ensuring the safety of maintenance personnel.

[0055] An adapter 49 and a circuit breaker 410 are sequentially connected between the first signal terminal 47 and the second signal terminal 48 of the signal coil 43. When connected to the circuit, it provides the necessary 50Hz power frequency notch filtering function for the 25Hz phase-sensitive track circuit, effectively suppressing the interference of traction current on the signal system. The circuit breaker 410 provides a disconnect point, allowing for flexible selection of whether to connect the adapter 49 to the circuit, meeting the usage requirements of different application scenarios.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An emergency choke transformer, characterized in that, include: Box body (1), the box body (1) is provided with handle (2), and casters (3) are provided at each corner of the bottom of the box body (1); A transformer (4) is installed inside the housing (1). The transformer (4) includes an iron core (41) and a coil wound on the iron core (41). The coil includes a traction coil (42), a signal coil (43), and a test coil (44). The turns ratio of the traction coil (42) and the signal coil (43) is 1:

24. The number of turns of the test coil (44) is greater than the number of turns of the traction coil (42) and less than the number of turns of the signal coil (43). The traction coil (42) has a first traction terminal (45) and a second traction terminal (46), and the first traction terminal (45) and the second traction terminal (46) are respectively connected to two guide rails; The signal coil (43) has a first signal terminal (47) and a second signal terminal (48), and an adapter (49) and a circuit breaker (410) are connected sequentially between the first signal terminal (47) and the second signal terminal (48). The test coil (44) has a first test terminal (411) and a second test terminal (412).

2. The emergency choke transformer according to claim 1, characterized in that, A third traction terminal is also led out from the traction coil (42). The third traction terminal is used for traction return. The first traction terminal (45) and the third traction terminal are connected to the first traction coil (421). The second traction terminal (46) and the third traction terminal are connected to the second traction coil (422). The first traction coil (421) and the second traction coil (422) have the same number of turns.

3. The emergency choke transformer according to claim 2, characterized in that, The third traction terminal is connected to the midpoint connecting plate or the grounding grid.

4. The emergency choke transformer according to claim 1, characterized in that, The turns ratio of the test coil (44) to the signal coil (43) is 1:

4.

5. The emergency choke transformer according to claim 1, characterized in that, The enclosure (1) includes a shell (11) and a cover plate (12). The shell (11) has an opening (111) at the top. The transformer (4) is disposed inside the shell (11). The cover plate (12) can be opened and closed on the shell (11) to open or close the opening (111). The first traction terminal (45), the second traction terminal (46), the first signal terminal (47), the second signal terminal (48), the first test terminal (411), and the second test terminal (412) all protrude from the housing (11).

6. The emergency choke transformer according to claim 5, characterized in that, The cover plate (12) includes a first part (121) and a second part (122) connected to each other. The first part (121) is used to cover the opening (111), and the second part (122) is used to cover the first traction terminal (45), the second traction terminal (46), the first signal terminal (47), the second signal terminal (48), the first test terminal (411), and the second test terminal (412).

7. The emergency choke transformer according to claim 6, characterized in that, The first traction terminal (45), the second traction terminal (46), the first signal terminal (47), the second signal terminal (48), the first test terminal (411), and the second test terminal (412) protrude from the same side of the housing (11).

8. The emergency choke transformer according to claim 1, characterized in that, The transformer (4) is also equipped with a temperature detector (5), which is connected to a mobile device via wireless data transmission.

9. The emergency choke transformer according to claim 1, characterized in that, Each side of the housing (1) is provided with a fixing mechanism (6). The fixing mechanism (6) includes a fixing seat (61) and a locking member (62). The fixing seat (61) is disposed on the housing (1), and the locking member (62) is threadedly engaged with the fixing seat (61) to adjust its relative height on the housing (1).

10. The emergency choke transformer according to any one of claims 1-9, characterized in that, The housing (1) is made of aluminum.

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