Thyristor replacement device

Abstract

The present invention discloses a thyristor replacement device, comprising: the outlet end of a hydraulic pump is connected to the inlet end of a pressure relief valve, the outlet end of the pressure relief valve is connected to the inlet end of a diverter valve through a pipeline, a pressure gauge is arranged on the pipeline, the first outlet end of the diverter valve is connected to the inlet end of a first oil pipe, the second outlet end of the diverter valve is connected to the inlet end of a second oil pipe, a first control valve is arranged at the first outlet end of the diverter valve, a second control valve is arranged at the second outlet end of the diverter valve, the outlet end of the first oil pipe is connected to a first hydraulic cylinder, and the outlet end of the second oil pipe is connected to a second hydraulic cylinder; the first hydraulic cylinder comprises: a first cavity is U-shaped, a second cavity is strip-shaped, one end of two second cavities are respectively connected to the ends of two side arms of the U-shaped first cavity, and one surface of the two second cavities is respectively movably arranged with at least one first piston column. The present invention can quickly and efficiently replace a faulty thyristor, improve the power transmission reliability of a DC power transmission system, and reduce losses.

Description

Technical Field

[0001] The invention relates to the technical field of thyristor replacement, and in particular to a thyristor replacement device. Background Art

[0002] The converter valve is the core equipment of the UHV DC transmission project and the core functional unit for realizing AC / DC power conversion. Thyristors are the basic units that constitute the converter valve. Thyristor breakdown failure is one of the common faults of the converter valve. Handling such faults requires the converter valve to be in a maintenance state. Therefore, improving the efficiency of thyristor breakdown fault handling can shorten the converter valve power outage time and ensure the power transmission capacity of the DC transmission system. However, the existing thyristor replacement tools take a long time to replace thyristors. Summary of the invention

[0003] The embodiment of the present invention provides a thyristor replacement device to solve the problem that the thyristor replacement tool in the prior art takes a long time to replace the thyristor.

[0004] The embodiment of the present invention discloses the following technical solution:

[0005] A thyristor replacement device comprises: a hydraulic pump, a pressure relief valve, a pressure gauge, a diverter valve, a first oil pipe, a second oil pipe, a first control valve, a second control valve, a first hydraulic cylinder and a second hydraulic cylinder; the outlet end of the hydraulic pump is connected to the inlet end of the pressure relief valve, the outlet end of the pressure relief valve is connected to the inlet end of the diverter valve through a pipeline, the pipeline is provided with the pressure gauge, the first outlet end of the diverter valve is connected to the inlet end of the first oil pipe, the second outlet end of the diverter valve is connected to the inlet end of the second oil pipe, the first control valve is provided at the first outlet end of the diverter valve, and the second control valve is provided at the second outlet end of the diverter valve. Control valve, the outlet end of the first oil pipe is connected to the first hydraulic cylinder, and the outlet end of the second oil pipe is connected to the second hydraulic cylinder; wherein, the first hydraulic cylinder comprises: a first cavity, two second cavities and a first piston column, the first cavity is U-shaped, the second cavity is strip-shaped, one end of the two second cavities is respectively connected to the end of the two side arms of the U-shape of the first cavity, the second cavity is perpendicular to the plane where the first cavity is located, and one surface of the two second cavities is respectively movably provided with at least one first piston column, wherein one surface of the second cavity is a surface parallel to the bottom surface of the U-shape of the first cavity.

[0006] Furthermore, the second hydraulic cylinder comprises: a third cavity and a second piston column, and the second piston column is movably disposed at one end of the third cavity.

[0007] Furthermore, the thyristor replacement device further comprises: an extended piston column, wherein the extended piston column is detachably connected to the second piston column.

[0008] Further: the first outlet end of the diverter valve and the inlet end of the first oil pipe are connected through a first joint.

[0009] Further: the second outlet end of the diverter valve and the inlet end of the second oil pipe are connected via a second joint.

[0010] Further: a pressure relief knob is provided on the hydraulic pump.

[0011] The thyristor replacement device of the embodiment of the present invention can replace faulty thyristors more quickly and efficiently, and is particularly effective in handling swollen thyristors, thereby improving the power transmission reliability of the DC power transmission system, reducing losses, and having good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0013] Figure 1 is a schematic diagram of the three-dimensional structure of a thyristor replacement device according to an embodiment of the present invention;

[0014] Figure 2 4 is a side view of a thyristor replacing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] The embodiment of the present invention discloses a thyristor replacement device. Figure 1 and 2 As shown, the thyristor replacement device includes: a hydraulic pump 1, a pressure relief valve 2, a pressure gauge 3, a diverter valve 4, a first oil pipe 5, a second oil pipe 6, a first control valve 7, a second control valve 8, a first hydraulic cylinder 9 and a second hydraulic cylinder 10.

[0017] The hydraulic pump 1 is a manual hydraulic pump. The outlet end of the hydraulic pump 1 is connected to the inlet end of the pressure relief valve 2. Specifically, a pressure relief knob 11 is provided on the hydraulic pump 1. The outlet end of the pressure relief valve 2 is connected to the inlet end of the diverter valve 4 through a pipeline 12. A pressure gauge 3 is provided on the pipeline 12. The first outlet end of the diverter valve 4 is connected to the inlet end of the first oil pipe 5. The second outlet end of the diverter valve 4 is connected to the inlet end of the second oil pipe 6. Preferably, the first outlet end of the diverter valve 4 and the inlet end of the first oil pipe 5 are connected through a first joint 13, and the second outlet end of the diverter valve 4 and the inlet end of the second oil pipe 6 are connected through a second joint 14. Both the first joint 13 and the second joint 14 are quick joints. A first control valve 7 is provided at the first outlet end of the diverter valve 4. A second control valve 8 is provided at the second outlet end of the diverter valve 4. The outlet end of the first oil pipe 5 is connected to the first hydraulic cylinder 9. The first hydraulic cylinder 9 is a 5t hydraulic cylinder. The outlet end of the second oil pipe 6 is connected to the second hydraulic cylinder 10. The second hydraulic cylinder 10 is a 25t hydraulic cylinder. The pressure of the first hydraulic cylinder 9 is used to replace the pressure of the gap-filling gasket of the thyristor, and the second hydraulic cylinder 10 is used to provide the pressure for opening the heat sink of the thyristor.

[0018] The first hydraulic cylinder 9 includes: a first cavity 901, two second cavities 902 and a first piston column 903. The first cavity 901 is U-shaped. The second cavity 902 is strip-shaped. One end of the two second cavities 902 is respectively connected to the ends of the two side arms of the U-shape of the first cavity 901. The second cavity 902 is perpendicular to the plane where the first cavity 901 is located. At least one first piston column 903 is movably provided on one surface of the two second cavities 902. Preferably, two first piston columns 903 are arranged at intervals on each second cavity 902. One surface of the second cavity 902 is a surface parallel to the bottom surface of the U-shape of the first cavity 901.

[0019] The second hydraulic cylinder 9 comprises: a third cavity and a second piston column. The second piston column is movably arranged at one end of the third cavity.

[0020] Preferably, the thyristor replacement device further comprises: an extended piston column. The extended piston column is detachably connected to the second piston column. When the length of the second piston column is insufficient, the extended piston column can be used to increase the length.

[0021] The following uses the A5000 type thyristor of a converter valve as an example to illustrate the use process of the thyristor replacement device of the embodiment of the present invention. The A5000 type thyristor of a converter valve is clamped by heat sinks located at both ends of the thyristor. The thyristor and the heat sink are connected by wires.

[0022] When in use, first connect the second piston column of the second hydraulic cylinder 10 to the central tube of the pressure loading adapter of the thyristor, so that the second hydraulic cylinder 10 is firmly connected to the pressure loading adapter. When the stroke of the second piston column is not enough, the second piston column can be connected to the extended piston column in advance, and then the extended piston column is connected to the central tube of the pressure loading adapter of the thyristor. Use a thyristor protection band to support the thyristor from the bottom of the thyristor to prevent the thyristor from falling due to lack of support after the heat sinks at both ends of the thyristor are stretched open. In addition, it is also convenient to remove the thyristor from between the heat sinks. Remove the wires between the thyristor and the heat sink. Fix the first hydraulic cylinder 9 at the position of the thyristor to be removed. Specifically, the two second cavities 902 of the first hydraulic cylinder 9 are respectively located on both sides of the thyristor, that is, the thyristor is stuck between the two second cavities 902, so that the first piston columns 903 of the two second cavities 902 are respectively facing the two side ends of the heat sink at one end of the thyristor, that is, the top pressure position of the heat sink.

[0023] Then, pressure testing is performed to ensure that the pressure of the first hydraulic cylinder 9 can stretch the heat sink, and the pressure of the second hydraulic cylinder 10 can replace the pressure of the shim, so that the shim can be removed. Specifically, first open the second control valve 8, tighten (the tightening direction is generally clockwise) the pressure relief knob 11 of the hydraulic pump 1, and open the pressure relief valve 2 (the opening direction is generally counterclockwise). Manually pressurize the hydraulic pump 1. When the pressure of the pressure gauge 3 is greater than 55MPa, the shim at the center tube of the pressure loading adapter of the thyristor will fall. If the pressure reaches 60MPa and the shim still does not fall, stop pressurizing. At this time, open the pressure relief knob 11 to release the pressure, and then check whether the second piston column (or extended piston column) of the second hydraulic cylinder 10 is stuck, whether the second hydraulic cylinder 10 has reached the stroke limit, etc. After solving the above problems, repeat the above manual pressure operation process. Then, tighten the pressure relief valve 2, open the pressure relief knob 11 a little, and release the pressure relief valve 2 while observing the pressure gauge 3. It should be noted that the pressure should be released slowly. When the pressure value of the pressure gauge 3 is 5-10MPa, stop releasing the pressure. Observe how many shims are needed to fill the gap, then slightly pressurize, put these shims on, and then slightly release the pressure. If the shims are pressed tightly, this step is correct, indicating that the pressure can be completely relieved. The first hydraulic cylinder 9 can open the heat sink, and the second hydraulic cylinder 10 can provide the pressure of the shims, which can remove the shims to loosen the thyristor as a whole, so as to remove the thyristor.

[0024] When starting to disassemble the thyristor, open the first control valve 7 and pressurize the first hydraulic cylinder 9 until the piston rod 903 of the first hydraulic cylinder 9 opens the heat sink to ensure that there is a gap of 1 to 2 mm between the heat sink and the thyristor, and then stop pressurizing. Lift the thyristor protection band and take out the thyristor to be replaced. Use an electric spinning or lint-free cloth dipped in anhydrous ethanol to clean the surface of the heat sink; use an electric spinning cloth dipped in conductive paste to evenly apply a thin layer of conductive paste on the surface of the new thyristor. Then put the new thyristor into the position to be replaced.

[0025] Control the hydraulic pump 1 and the first hydraulic cylinder 9 to gradually release the pressure, and remove the first hydraulic cylinder 9 from the thyristor. Control the hydraulic pump 1 to connect with the second hydraulic cylinder 10, gradually increase the pressure to more than 55Mpa, put in the original gap-filling gasket, and then release the pressure to zero. After the pressure is released, remove the second hydraulic cylinder 10 from the thyristor (if an extended piston rod is used, remove the extended piston rod from the second hydraulic cylinder 10), and the thyristor is replaced.

[0026] By using this thyristor replacement tool, the time saved in replacing a single thyristor (especially the expanded thyristor) is 2 to 4 hours on average, and the efficiency is 3.25 times that of the original tool. Based on the power transmission of a single valve group of 2000MW, the time spent on replacing a single expanded thyristor will save at least 5000MW of power loss compared to the original tool processing.

[0027] In summary, the thyristor replacement device of the embodiment of the present invention can replace faulty thyristors more quickly and efficiently, and is especially effective in handling swollen thyristors, thereby improving the power transmission reliability of the DC power transmission system, reducing losses, and having good application prospects.

[0028] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A thyristor replacement device, characterized in that: include: A hydraulic pump, a pressure relief valve, a pressure gauge, a diverter valve, a first oil pipe, a second oil pipe, a first control valve, a second control valve, a first hydraulic cylinder, and a second hydraulic cylinder; The outlet end of the hydraulic pump is connected to the inlet end of the pressure relief valve, the outlet end of the pressure relief valve is connected to the inlet end of the diverter valve through a pipeline, the pipeline is provided with the pressure gauge, the first outlet end of the diverter valve is connected to the inlet end of the first oil pipe, the second outlet end of the diverter valve is connected to the inlet end of the second oil pipe, the first control valve is provided at the first outlet end of the diverter valve, the second control valve is provided at the second outlet end of the diverter valve, the outlet end of the first oil pipe is connected to the first hydraulic cylinder, and the outlet end of the second oil pipe is connected to the second hydraulic cylinder; Wherein, the first hydraulic cylinder comprises: a first cavity, two second cavities and a first piston column, the first cavity is U-shaped, the second cavity is strip-shaped, one end of the two second cavities is respectively connected to the ends of the two side arms of the U-shape of the first cavity, the second cavity is perpendicular to the plane where the first cavity is located, and one surface of the two second cavities is respectively movably provided with at least one first piston column, wherein one surface of the second cavity is a surface parallel to the bottom surface of the U-shape of the first cavity; The second hydraulic cylinder comprises: a third cavity and a second piston column, and one end of the third cavity is movably provided with the second piston column; The hydraulic pump is provided with a pressure relief knob.

2. The thyristor replacement device according to claim 1, characterized in that: Also includes: An extended piston column is detachably connected to the second piston column.

3. The thyristor replacement device according to claim 1, characterized in that: The first outlet end of the diverter valve and the inlet end of the first oil pipe are connected via a first joint.

4. The thyristor replacement device according to claim 1, characterized in that: The second outlet end of the diverter valve and the inlet end of the second oil pipe are connected via a second joint.

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