Rogowski coil fixing frame for track insulation test

Abstract

The utility model belongs to the technical field of track insulation test, and relates to a Rogowski coil fixing frame for track insulation test, which comprises a steel rail tread fitting part and positioning side arms connected to two ends of the steel rail tread fitting part. The inner surface of the steel rail tread attaching part is attached to the outer surface of a steel rail tread; the outer contour of the positioning side arm is circular, the diameter of the positioning side arm is larger than the maximum width of the track, the circle center of the circle coincides with the center of an insulation joint of the track, and the positioning side arm is used for supporting a Rogowski coil; according to the utility model, the steel rail tread fitting part and the positioning side arm are arranged, so that the Rogowski coil can be conveniently and stably supported, the Rogowski coil is kept tangent with a measured circuit and the circle center of the Rogowski coil is always overlapped with the center of an insulating joint of a track in a long-time measurement process, and further, non-tangent and non-concentric displacement of the Rogowski coil is avoided; and the accuracy and the reliability of the rail insulation performance test are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of track insulation testing, in particular to a Rogowski coil fixing frame for track insulation testing. Background Art

[0002] In railway operations, testing track insulation performance is a key component in ensuring train safety. To efficiently and accurately assess track insulation status, Rogowski coils, as highly sensitive electromagnetic induction elements, are widely used in track insulation testing systems.

[0003] The use of Rogowski coils is based on Faraday's law of electromagnetic induction. When a changing current passes through a track, a changing magnetic field is generated around the track. The Rogowski coil captures the changing magnetic field through a closed coil structure and generates a corresponding induced electromotive force within the coil. By measuring the magnitude and phase of the corresponding induced electromotive force, the current change passing through the conductor can be indirectly inferred, and the insulation condition of the track can be evaluated.

[0004] There is some research on rail insulation testing in the prior art. Referring to patent document No. 202410336332.0, a rail insulation measuring instrument is disclosed, including: a rail insulation measuring device. The specification discloses that a coil test interface is fixedly provided on the top surface of the upper end of the rail insulation measuring device, and two Rogowski coils are connected to the surface of the coil test interface, and the other ends of the two Rogowski coils connected to the coil test interface are wound around the surface of the insulation section of the railway track.

[0005] When a varying current flows through the track under test, the insulation condition of the track can be assessed by measuring the magnitude and phase of the induced electromotive force on the Rogowski coil. However, over long periods of measurement, the Rogowski coil is susceptible to deformation due to its inherent material properties. This can cause the coil to lose its tangent relationship to the measured circuit and the center of the coil to lose its alignment with the center of the insulation node of the track under test. This, in turn, reduces the accuracy and reliability of the track insulation performance test. Utility Model Content

[0006] In view of the technical problem in the background technology that during a long measurement process, the Rogowski coil is prone to deformation, resulting in the Rogowski coil not always maintaining tangent to the measured circuit and the center of the Rogowski coil not always coinciding with the center of the insulation node of the measured track, thereby reducing the accuracy and reliability of the insulation performance test of the measured track, the utility model provides a Rogowski coil fixing bracket for track insulation testing.

[0007] The utility model discloses a Rogowski coil fixing frame for track insulation testing, which is provided with a rail tread contact portion and a positioning side arm, so as to stably support the Rogowski coil. During a long measurement process, the Rogowski coil is always kept tangent to the measured circuit, and the center of the Rogowski coil is always coincident with the center of the insulation node of the measured track, thereby avoiding non-tangent and non-concentric displacement of the Rogowski coil, and improving the accuracy and reliability of the track insulation performance test.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A Rogowski coil fixing frame for rail insulation testing comprises: a rail tread-fitting portion and positioning side arms connected to both ends of the rail tread-fitting portion; the inner surface of the rail tread-fitting portion fits the outer surface of the rail head; the positioning side arms have a circular outer contour, the diameter of the positioning side arms is greater than the maximum width of the rail being tested, and the center of the circle coincides with the center of the insulation node of the rail being tested; and the positioning side arms are used to support the Rogowski coil.

[0010] In a specific possible implementation scheme, a mounting groove is provided on the positioning side arm; the inner diameter of the mounting groove matches the diameter of the Rogowski coil wire, and the Rogowski coil wire is embedded in the mounting groove.

[0011] In a specific possible implementation scheme, the rail tread fitting portion includes a fitting section and a transition section connected to both ends of the fitting section; the fitting section fits with the outer surface of the rail head; and the transition section is connected to the positioning side arm.

[0012] In a specific embodiment, the fitting section and the transition section are connected by a first arc section.

[0013] In a specific implementation manner, the arc angle of the first arc segment ranges from π / 3 to 2π / 3.

[0014] In a specific possible implementation manner, the transition section and the positioning side arm are connected via a second arc section.

[0015] In a specific implementation manner, the arc angle of the second arc segment ranges from 5π / 12 to 7π / 12.

[0016] In a specific possible implementation manner, the Rogowski coil fixing frame for rail insulation testing further includes reinforcement rods respectively connected to both ends of the fitting section; the reinforcement rods are connected to the transition section.

[0017] In a specific possible implementation scheme, the Rogowski coil fixing frame for rail insulation testing further includes a signal receiving component, which includes a connecting block and a data receiving box; the data receiving box is connected to the rail tread contact portion via the connecting block.

[0018] In a specific possible implementation scheme, the connecting block includes an upper clamping portion and a lower clamping portion; the upper clamping portion is connected to the top of the lower clamping portion; the bottom of the lower clamping portion is connected to the rail tread fitting portion; a wire passing hole is provided at the contact point between the upper clamping portion and the lower clamping portion, the wire of the Rogowski coil passes through the wire passing hole, and the Rogowski coil is electrically connected to the data receiving box.

[0019] In summary, the present invention has the following beneficial technical effects:

[0020] 1. The utility model provides a Rogowski coil fixing frame for track insulation testing. The rail tread contact portion and positioning side arms provide stable support for the Rogowski coil. During long-term measurements, the Rogowski coil always remains tangent to the measured circuit and the center of the Rogowski coil always coincides with the center of the insulation node of the measured track. This prevents non-tangent and non-concentric displacement of the Rogowski coil, thereby improving the accuracy and reliability of track insulation performance testing.

[0021] 2. The utility model is provided with a Rogowski coil fixing frame for track insulation testing, a connection block and a data receiving box. The data receiving box timely and accurately captures the changes in the induced electromotive force on the Rogowski coil, realizes the real-time acquisition of the induced electromotive force signal of the Rogowski coil, and facilitates the operator to quickly obtain quantitative data on the insulation status of the tested track, thereby improving the efficiency and accuracy of track insulation testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a schematic diagram of the installation of a Rogowski coil fixing frame for rail insulation testing.

[0023] Figure 2 The utility model is a schematic diagram of the overall structure of a Rogowski coil fixing frame for track insulation testing.

[0024] Figure 3 The utility model is a schematic diagram of the installation of a Rogowski coil fixing frame for rail insulation testing.

[0025] Explanation of the accompanying reference numerals: 1. Rail tread fitting portion; 11. Fitting section; 12. Transition section; 13. First arc section; 2. Positioning side arm; 21. Mounting groove; 3. Rogowski coil; 4. Second arc section; 5. Reinforcement rod; 6. Signal receiving assembly; 61. Connecting block; 611. Upper clamping portion; 612. Lower clamping portion; 613. Wire hole; 62. Data receiving box. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0027] The cross-section of a track is primarily composed of three major components: the rail tread, the rail waist, and the rail base, forming a wide-bottomed I-shaped cross-section. An insulating joint is provided at the rail waist to ensure electrical isolation between sections of the railway electrical system, preventing current flow between unneeded sections, signal interference, and malfunctions, thereby ensuring the safety and stability of railway transportation. The center of the insulating joint refers to the geometric center point of the location of the insulating joint. The Rogowski coil fixture for track insulation testing in this utility model is used for gauge rod insulation inspection. During inspection, the Rogowski coil 3 is looped onto the gauge rod.

[0028] Reference Figure 1 A Rogowski coil fixture for rail insulation testing includes a rail tread contact portion 1 and positioning side arms 2 connected to both ends of the rail tread contact portion 1. The inner surface of the rail tread contact portion 1 contacts the outer surface of the rail head. The positioning side arms 2 have a circular outer contour, with a diameter greater than the maximum width of the track being tested and the center of the circle coinciding with the center of the insulation joint of the track being tested. The positioning side arms 2 are used to support the Rogowski coil 3.

[0029] In the present invention, first, the rail tread fitting portion 1 is installed on the rail tread to achieve position fixation of the Rogowski coil fixing frame for rail insulation testing; then, the Rogowski coil 3 is connected to the positioning side arm 2 to achieve position fixation of the Rogowski coil 3. At this time, the center of the Rogowski coil 3 coincides with the center of the insulation node of the track being tested; at this time, by measuring the magnitude and phase of the induced electromotive force on the Rogowski coil 3, the insulation performance of the track being tested can be evaluated.

[0030] Reference Figure 1 and Figure 2 A mounting groove 21 is provided on the positioning side arm 2. The inner diameter of the mounting groove 21 matches the diameter of the wire of the Rogowski coil 3, and the wire of the Rogowski coil 3 is embedded in the mounting groove 21.

[0031] Reference Figure 1 The rail tread fitting portion 1 includes a fitting section 11 and a transition section 12 connected to both ends of the fitting section 11. The fitting section 11 fits the outer surface of the rail tread; the transition section 12 is connected to the positioning side arm 2.

[0032] Reference Figure 1 and Figure 3 The fitting section 11 and the transition section 12 are connected by a first arc section 13. The arc range of the first arc section 13 is π / 3-2π / 3.

[0033] In the present invention, the radian of the first arc segment 13 can be π / 3, π / 2, or 2π / 3. Preferably, the radian of the first arc segment 13 is π / 2. By setting the first arc segment 13 to a suitable radian, the wear of the first arc segment 13 on the measured track can be reduced, and such radian values are acceptable.

[0034] Reference Figure 1 The transition section 12 is connected to the positioning side arm 2 via a second arc segment 4. The arc range of the second arc segment 4 is 5π / 12-7π / 12.

[0035] In the present invention, the radian of the second arc segment 4 can be 5π / 12, π / 2, or 7π / 12. Preferably, the radian of the second arc segment 4 is π / 2. By setting the second arc segment 4 to a suitable radian, the stress concentration between the transition section 12 and the positioning side arm 2 is reduced, and such radian values are acceptable.

[0036] Example 1:

[0037] Reference Figure 1 In this embodiment, the fixing frame for the Rogowski coil used for the track insulation test further includes reinforcing rods 5 connected to both ends of the bonding section 11 . The reinforcing rods 5 are connected to the transition section 12 .

[0038] Specifically, one end of the reinforcement rod 5 is welded to the fitting section 11 , and the other end is welded to the transition section 12 , and the reinforcement rod 5 is tilted from the end close to the fitting section 11 to the end close to the transition section 12 .

[0039] In this embodiment, the reinforcement rod 5 is provided to share part of the stress from the Rogowski coil 3 and the track to be tested, thereby enhancing the overall structural strength of the Rogowski coil fixing frame for track insulation testing.

[0040] Example 2:

[0041] Reference Figure 1 The Rogowski coil fixing frame for rail insulation testing in this embodiment further includes a signal receiving assembly 6, which includes a connecting block 61 and a data receiving box 62. The data receiving box 62 is connected to the rail tread contact portion 1 via the connecting block 61.

[0042] Specifically, when testing the insulation performance of the track under test, the operator needs to hold a handheld measuring device. The data receiving box 62 collects and receives the induced electromotive force signal from the Rogowski coil 3. The data receiving box 62 then transmits the received signal wirelessly to the measuring device, which then reads the online AC insulation impedance value. More specifically, if the online AC insulation impedance value is greater than 20Ω, the insulation performance of the track under test at that location is good; if the online AC insulation impedance value is between 5Ω and 20Ω, the insulation performance of the track under test at that location should be monitored closely; if the online AC insulation impedance value is less than 5Ω, the insulation performance of the track under test at that location is poor, and replacement of the insulation joint is recommended.

[0043] In this embodiment, a connection block 61 and a data receiving box 62 are provided. The data receiving box 62 promptly and accurately captures the changes in the induced electromotive force on the Rogowski coil 3 and transmits the signal wirelessly to the measuring handheld device, thereby realizing real-time acquisition and wireless transmission of the induced electromotive force signal of the Rogowski coil 3. This facilitates the operator to remotely and quickly obtain quantitative data on the insulation status of the measured track, thereby improving the efficiency and accuracy of track insulation testing.

[0044] Example 3:

[0045] Reference Figure 1 and Figure 2 This embodiment of the track insulation test Rogowski coil fixture is based on the second embodiment. The connection block 61 includes an upper engaging portion 611 and a lower engaging portion 612. The upper engaging portion 611 is connected to the top of the lower engaging portion 612; the bottom of the lower engaging portion 612 is connected to the rail tread contact portion 1. A wire hole 613 is defined at the contact point between the upper engaging portion 611 and the lower engaging portion 612. The wire of the Rogowski coil 3 passes through the wire hole 613, and the Rogowski coil 3 is electrically connected to the data receiving box 62.

[0046] In the present invention, the connecting block 61 is composed of an upper engaging portion 611 and a lower engaging portion 612 , which simplifies the installation process of the signal receiving assembly 6 and ensures a stable connection between the data receiving box 62 and the rail tread fitting portion 1 .

[0047] The working principle of the Rogowski coil fixing frame for track insulation testing of the present invention is as follows: first, the rail tread bonding portion 1 is tightly bonded to the outer surface of the rail tread to achieve preliminary positioning of the Rogowski coil fixing frame for track insulation testing on the track to be tested; then, the Rogowski coil 3 is installed on the positioning side arm 2 through the positioning side arm 2 to achieve positioning of the Rogowski coil 3. At this time, the center of the Rogowski coil 3 coincides with the center of the insulation node of the track to be tested.

[0048] When Rogowski coil 3 is energized, an alternating magnetic field is generated around it. When the insulation state of the track under test changes, the induced electromotive force (EMF) in the coil 3 changes accordingly. The data receiving box 62 captures this induced EMF in real time and wirelessly transmits it to the measuring handheld device. Based on the received induced EMF signal, the measuring handheld device calculates the online AC insulation impedance value, thereby determining the insulation performance of the track under test.

[0049] The preferred embodiments of the present invention are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A Rogowski coil fixing frame for rail insulation testing, characterized in that: include: A rail tread fitting portion (1) and positioning side arms (2) connected to both ends of the rail tread fitting portion (1); The inner surface of the rail tread contact portion (1) is in contact with the outer surface of the rail tread; The outer contour of the positioning side arm (2) is circular, the diameter of the positioning side arm (2) is greater than the maximum width of the track to be measured, and the center of the circle coincides with the center of the insulating node of the track to be measured. The positioning side arm (2) is used to support the Rogowski coil (3).

2. The Rogowski coil fixing bracket for rail insulation testing according to claim 1, characterized in that: The positioning side arm (2) is provided with a mounting groove (21); The inner diameter of the installation groove (21) matches the diameter of the lead wire of the Rogowski coil (3), and the lead wire of the Rogowski coil (3) is embedded in the installation groove (21).

3. The Rogowski coil fixing frame for rail insulation testing according to claim 2, characterized in that: The rail tread fitting portion (1) comprises a fitting section (11) and transition sections (12) connected to both ends of the fitting section (11); The fitting section (11) fits the outer surface of the rail tread; The transition section (12) is connected to the positioning side arm (2).

4. The Rogowski coil fixing frame for rail insulation testing according to claim 3, characterized in that: The fitting section (11) and the transition section (12) are connected via a first circular arc section (13).

5. The Rogowski coil fixing frame for rail insulation testing according to claim 4, characterized in that: The arc angle of the first circular arc segment (13) ranges from π / 3 to 2π / 3.

6. The Rogowski coil fixing frame for rail insulation testing according to claim 4, characterized in that: The transition section (12) is connected to the positioning side arm (2) via a second circular arc section (4).

7. The Rogowski coil fixing frame for rail insulation testing according to claim 6, characterized in that: The arc angle of the second circular arc segment (4) ranges from 5π / 12 to 7π / 12.

8. The Rogowski coil fixing frame for rail insulation testing according to any one of claims 3 to 7, characterized in that: The track insulation test Rogowski coil fixing frame further comprises reinforcing rods (5) respectively connected to both ends of the bonding section (11); The reinforcement rod (5) is connected to the transition section (12).

9. The Rogowski coil fixing frame for rail insulation testing according to claim 1, characterized in that: The track insulation test Rogowski coil fixing frame further comprises a signal receiving component (6), wherein the signal receiving component (6) comprises a connecting block (61) and a data receiving box (62); The data receiving box (62) is connected to the rail tread contact portion (1) via a connecting block (61).

10. The Rogowski coil fixing frame for rail insulation testing according to claim 9, characterized in that: The connecting block (61) comprises an upper engaging portion (611) and a lower engaging portion (612); The upper engaging portion (611) is connected to the top of the lower engaging portion (612); The bottom of the lower engaging portion (612) is connected to the rail tread engaging portion (1); A wire hole (613) is provided at the contact point between the upper clamping portion (611) and the lower clamping portion (612), and the wire of the Rogowski coil (3) passes through the wire hole (613), and the Rogowski coil (3) is electrically connected to the data receiving box (62).

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