Heat treatment process for strain flow plate

Abstract

The application discloses a heat treatment process of tension drainage plate, which comprises the following construction steps: cooling the heating part of the drainage plate when the treatment is carried out under the live working condition; then finding the heating reason of the tension drainage plate; removing the electric power composite grease on the contact part of the two drainage plates; polishing the surface of the drainage plate; coating the first grease on the contact surface of the two drainage plates with a spatula, and then rubbing the contact surface with a fine copper wire brush for multiple times; coating the second grease on the contact surface of the two drainage plates with a spatula; sealing the contact joint of the two contact surfaces by removing the electric power composite grease on the contact surface of the two drainage plates with oil paper; replacing the new bolt; checking the contact surface and the joint of the two drainage plates; removing the subassembly line installed in the step; and detecting the temperature or the contact surface resistance of the drainage plate. The process steps are solidified, the treatment steps are more standardized, the treatment process is simplified, the construction is more convenient, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of power transmission line construction technology, and more specifically to the heat treatment process of tension diverter plates. Background Technology

[0002] During long-term use, the insulation of power transmission lines is easily affected by dirt and water accumulation. Currently, in order to improve the insulation of power transmission lines, diversion plates are usually installed on the lines to divert accumulated water and other pollutants.

[0003] When treating the overheating of the diverter plate, the complex processing technology makes it easy for errors to occur in the steps. At the same time, it is also easily affected by various factors such as the skill level of personnel, the process, and the tools used, making it difficult to standardize the on-site construction operation. This directly leads to frequent overheating failures of the diverter plate in the transmission line, affecting the safe and stable operation of the equipment. If it is not detected and dealt with in time for a long time, it will lead to the blockage accident of the UHVDC line.

[0004] Therefore, developing a simple and standardized process for the heating treatment of tension diversion plates is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a heat treatment process for tension diversion plates that is simple to operate and has a more standardized process flow.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The heat treatment process for tension diversion plates includes the following construction steps:

[0008] S1, Cooling: When handling the situation under live working conditions, cool down the heating part of the diversion plate and install the diversion line to reduce the temperature of the heating part of the diversion plate to below 50℃.

[0009] S2, Investigate the cause: Check the installation of the drainage plate and the bolts to find the cause of the overheating of the tension drainage plate;

[0010] S3, Remove old grease: Remove the electrical compound grease from the contact area of ​​the two drain plates, wipe off the wet electrical compound grease, scrape off the dry electrical compound grease with a scraper, and check the surface of the drain plates for burns and deformation.

[0011] S4, Fine polishing: First, use a fine file to remove the protrusions on the contact surfaces of the two drain plates, and then polish the surface of the drain plates to remove burrs, pits, oil stains and oxide film.

[0012] S5, Apply initial grease: Apply initial grease to the contact surface of the two drain plates with a spatula, then rub the contact surface repeatedly with a fine copper wire brush. After rubbing, remove the electrical compound grease from the contact surface.

[0013] S6, Apply double grease: Apply double grease to the contact surfaces of the two drain plates with a spatula, and mark the length of the electrical compound grease used on the spatula;

[0014] S7, Grease sealing: Use grease-wiping paper to seal the joint between the two contact surfaces by removing the overflowing electrical composite grease.

[0015] S8, combined drainage: Replace the new bolts and overlap the contact surfaces of the two drainage plates. After overlapping, place washers on both sides of the drainage plates. The bolts pass through the washers, drainage plates and connect to the nuts. Set a spring ring on the side of the nut near the drainage plate. First, pre-tighten until the spring ring is in an uncompressed state, and then use a wrench to tighten the bolts or nuts until the spring ring is flat.

[0016] S9, Initial Acceptance: Inspect the contact surfaces and joints of the two diversion plates, and then check the tightness of the bolts;

[0017] S10, Disassembly line: Remove the assembly line installed in step S1;

[0018] S11, Final Acceptance: For diversion plates used in live-line work, perform infrared temperature measurement 10 minutes after removing the shunt wires; for diversion plates used in de-energized work, test the resistance at the contact point between the two diversion plates.

[0019] The beneficial effects of adopting the above technical solution are that the process steps are combined with national standards in this invention, thereby solidifying the process steps and tools used, simplifying the construction operation process, reducing the impact of uneven skill levels of construction personnel on construction, and thus improving the effect of heat treatment.

[0020] Preferably, in step S2, when investigating the cause of overheating, it is necessary to check the reverse installation of the two drain plates, the stress on the contact surfaces, the sealing of the contact seams and the presence of foreign objects, and the condition of the electrical composite grease on the contact surfaces; and to check the specifications and sizes of the bolts, washers and elastic rings, and the looseness of the bolts.

[0021] Preferably, in step S2, during power outage construction, the resistance value of the contact surface of the two diversion plates is measured and recorded. The resistance value is then remeasured after construction is completed. By remeasuring the resistance value, it is possible to check whether the diversion plates after heat treatment meet the requirements.

[0022] Preferably, in step S4, the grinding depth does not exceed 0.2 mm. After grinding, the surface of the heating surface of the drain plate needs to be inspected; the flatness tolerance is less than 0.1 mm, the roughness Ra is less than or equal to 12.5 μm, and the flatness is less than or equal to 0.1 mm. Flatness and roughness are important parameters affecting the electrical contact performance of the drain plate. By limiting the values ​​of flatness and roughness, the process flow can be solidified, reducing the influence of other factors on the heating process.

[0023] Preferably, the thickness of the grease applied in step S6 is 0.1-0.2 mm.

[0024] Preferably, when measuring grease thickness, the length of the grease used is measured using a spatula, and the volume of the grease used is calculated. The flat coating thickness can be calculated from the volume of grease applied and the contact area. This calculation method allows for a simple calculation of the flat coating thickness, which not only simplifies the operation process but also improves the application speed, application standards, and coating thickness of electrical composite grease.

[0025] Preferably, step S8, when replacing the bolts, includes replacing the nuts, washers, and elastic washers; for double bolts, they are tightened sequentially; for four bolts, they are tightened diagonally. By using different tightening methods, it can be ensured that the torque applied to the bolts is within the specified range.

[0026] Preferably, in step S9, when inspecting the contact surfaces of the two diversion plates, it is necessary to check the stress on the contact surfaces and the sealing of the joint; when inspecting the bolts, it is necessary to check the bolt size, the size of the washers and elastic rings, and the tightening torque.

[0027] Preferably, when installing the shunt line, the receiving side is installed first and then the supplying side is installed; when removing the shunt line, the supplying side is removed first and then the receiving side is removed.

[0028] Preferably, in step S11, when detecting the contact resistance of the contact surfaces of the two drain plates, the resistance value needs to be less than 20 μΩ.

[0029] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a heat treatment process for a tension-resistant drainage plate, the beneficial effects of which are:

[0030] (1) The processing technology in this invention can solidify the heat treatment process, making the process of construction personnel more standardized and reducing the impact of uneven skill levels of construction personnel on heat treatment.

[0031] (2) The processing technology of the present invention can simplify the processing flow, make construction more convenient, and improve construction efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 The process flow diagram of the heat treatment process provided by the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] This invention discloses a heat treatment process for tension-resistant drainage plates, including the following construction steps:

[0036] S1, Cooling: When handling the situation under live working conditions, cool down the heating part of the diversion plate and install the diversion line to reduce the temperature of the heating part of the diversion plate to below 50℃.

[0037] S2, Find the cause of overheating: Check the installation of the drainage plate and the bolts to find the cause of overheating of the tension drainage plate;

[0038] S3, Remove old grease: Remove the electrical compound grease from the contact area of ​​the two drain plates, wipe off the wet electrical compound grease, scrape off the dry electrical compound grease with a scraper, and check the surface of the drain plates for burns and deformation.

[0039] S4, Fine polishing: First, use a fine file to remove the protrusions on the contact surfaces of the two drain plates, and then polish the surface of the drain plates to remove burrs, pits, oil stains and oxide film.

[0040] S5, Apply initial grease: Apply initial grease to the contact surface of the two drain plates with a spatula, then rub the contact surface repeatedly with a fine copper wire brush. After rubbing, remove the electrical compound grease from the contact surface.

[0041] S6, Apply double grease: Apply double grease to the contact surfaces of the two drain plates with a spatula, and mark the length of the electrical compound grease used on the spatula;

[0042] S7, Grease sealing: Use grease-wiping paper to seal the joint between the two contact surfaces by removing the overflowing electrical composite grease.

[0043] S8, combined drainage: Replace the new bolts and overlap the contact surfaces of the two drainage plates. After overlapping, place washers on both sides of the drainage plates. The bolts pass through the washers, drainage plates and connect to the nuts. Set a spring ring on the side of the nut near the drainage plate. First, pre-tighten until the spring ring is in an uncompressed state, and then use a wrench to tighten the bolts or nuts until the spring ring is flat.

[0044] S9, Initial Acceptance: Inspect the contact surfaces and joints of the two diversion plates, and then check the tightness of the bolts;

[0045] S10, Disassembly line: Remove the assembly line installed in step S1;

[0046] S11, Final Acceptance: For diversion plates used in live-line work, perform infrared temperature measurement 10 minutes after removing the shunt wires; for diversion plates used in de-energized work, test the resistance at the contact point between the two diversion plates.

[0047] To further optimize the above technical solution, the heat treatment can be carried out under energized or de-energized conditions. When it needs to be carried out under energized conditions, the heat-generating part of the drain plate needs to be cooled down, which can be done by wrapping a damp cloth around the heat-generating part. When it is carried out under power failure conditions, it is not necessary to cool it down or install a shunt line.

[0048] To further optimize the above technical solution, the cross-section of the installed diversion line needs to meet the current carrying capacity of the operating equipment.

[0049] To further optimize the above technical solution, in step S2, when investigating the cause of overheating, it is necessary to check the reverse installation of the two drain plates, the stress on the contact surfaces, the sealing of the contact seams and the presence of foreign objects, and the condition of the electrical compound grease on the contact surfaces; check the specifications and sizes of the bolts, washers, and elastic rings, and the looseness of the bolts. It is necessary to check whether the two drain plates are installed in reverse, whether the stress on the contact surfaces meets the requirements, whether the contact seams are tight, whether the seal is good, and whether there are foreign objects trapped; open the contact surfaces to check for the presence of electrical compound grease, whether the electrical compound grease is qualified (not dry, uniform), and whether there are foreign objects such as dirt and protective paper. When checking the bolts, it is necessary to check whether the bolt specifications are too small, whether large washers and elastic washers are used, and whether there is discoloration and burning (check the process: orientation and exposed threads). When testing the bolt torque, use a torque wrench to check for looseness.

[0050] To further optimize the above technical solution, in step S2, when the power is off for construction, the resistance value of the contact surface of the two diversion plates is measured and the value is recorded. The resistance value is then measured again after the construction is completed.

[0051] To further optimize the above technical solution, when removing old grease, wet electrical composite grease can be wiped off with a wet paper towel, and when checking for burns and deformation, the burn depth should be less than 0.15m.

[0052] To further optimize the above technical solution, in step S4, the grinding depth should not exceed 0.2 mm. After grinding, the surface of the heating surface of the diversion plate needs to be inspected; the flatness tolerance should be less than 0.1 mm, the roughness Ra should be less than or equal to 12.5 μm, and the flatness should be less than or equal to 0.1 mm. During grinding, use 400-grit or higher sandpaper or scouring pad to polish.

[0053] To further optimize the above technical solution, when applying the initial grease, rubbing the drain plate with a fine steel wire brush can remove the oxide film on the surface of the drain plate. After rubbing, wipe off the electrical compound grease with cotton yarn or degreasing paper (ensuring no lint or thread).

[0054] To further optimize the above technical solution, the thickness of the grease coating in step S6 is 0.1-0.2 mm.

[0055] To further optimize the above technical solution, when measuring the grease thickness, the length of the grease used is measured by a spatula, and the volume of the grease used is calculated; the coating thickness can be calculated by the volume of the grease used, the application area, and the contact area.

[0056] To further optimize the above technical solution, step S8, when replacing bolts, includes replacing the nut, washer, and elastic washer, and replacing two thicker large washers and elastic washers; for double bolt tightening, tighten sequentially; for four bolt tightening, tighten diagonally. Use a torque wrench with the torque selected according to the bolt specifications. When applying torque with a torque wrench, the tightening speed should be uniform, and impact force should not be used. Slow down the operation when reaching near the preset torque value, and stop turning after hearing the beep to avoid over-tightening. The bolt length should preferably protrude 2-3 threads from the nut.

[0057] To further optimize the above technical solution, in step S9, when inspecting the contact surfaces of the two diversion plates, it is necessary to check the stress on the contact surfaces and the sealing of the joint; when inspecting the bolts, it is necessary to check the bolt specifications, the specifications of the washers and elastic rings, and the tightening torque.

[0058] To further optimize the above technical solution, when installing the shunt line, the receiving side should be installed first, followed by the supplying side; when removing the shunt line, the supplying side should be removed first, followed by the receiving side.

[0059] To further optimize the above technical solution, in step S11, when detecting the contact resistance of the contact surfaces of the two diversion plates, it is necessary to ensure that the resistance value is less than 20μΩ.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heating treatment process for a tension-resistant drainage plate, characterized in that, The construction steps include the following: S1, Cooling: When handling the situation under live working conditions, cool down the heating part of the diversion plate and install the diversion line to reduce the temperature of the heating part of the diversion plate to below 50℃. S2, Find the cause of overheating: Check the installation of the drainage plate and the bolts to find the cause of overheating of the tension drainage plate; S3, Remove old grease: Remove the electrical compound grease from the contact area of ​​the two drain plates, wipe off the wet electrical compound grease, scrape off the dry electrical compound grease with a scraper, and check the surface of the drain plates for burns and deformation. S4, Fine polishing: First, use a fine file to remove the protrusions on the contact surfaces of the two drain plates, and then polish the surface of the drain plates to remove burrs, pits, oil stains and oxide film. S5, Apply initial grease: Apply initial grease to the contact surface of the two drain plates with a spatula, then rub the contact surface repeatedly with a fine copper wire brush. After rubbing, remove the electrical compound grease from the contact surface. S6, Apply double grease: Apply double grease to the contact surface of the two drain plates with a spatula, and mark the length of the electrical composite grease used on the spatula; when measuring the grease thickness, measure the length of the grease used with the spatula and calculate the volume of the grease used; the flat coating thickness can be calculated by the volume of grease applied and the contact area. S7, Grease sealing: Wipe away the overflowing electrical composite grease at the contact surface of the two drain plates with grease-wiping paper to seal the joint between the two contact surfaces; S8, Combined drainage: Replace with new bolts, overlap the contact surfaces of the two drainage plates, place washers on both sides of the drainage plates after overlap, and connect the bolts through the washers, drainage plates and nuts. Place an elastic washer on the side of the nut close to the drainage plate; first pre-tighten until the elastic washer is in an uncompressed state, and then use a wrench to tighten the bolts or nuts until the elastic washer is flattened. S9, Initial Acceptance: Inspect the contact surfaces and joints of the two diversion plates, and then check the tightness of the bolts; S10, Dismantle the flow: Remove the flow splitter installed in step S1; S11, Final Acceptance: For diversion plates used in live-line work, perform infrared temperature measurement 10 minutes after removing the shunt wires; for diversion plates used in de-energized work, test the resistance at the contact point between the two diversion plates. When investigating the cause of overheating, it is necessary to check the reverse installation of the two drainage plates, the stress on the contact surfaces, the sealing of the contact seams and the presence of foreign objects, and the condition of the electrical compound grease on the contact surfaces; check the specifications and sizes of the bolts, washers and elastic washers, and the looseness of the bolts.

2. The heating treatment process for the tension-resistant drainage plate according to claim 1, characterized in that, In step S2, when the power is off for construction, the resistance value of the contact surface of the two diversion plates is measured and recorded. The resistance value is then measured again after the construction is completed.

3. The heating treatment process for the tension-resistant drainage plate according to claim 1, characterized in that, In step S4, the grinding depth shall not exceed 0.2 mm. After grinding, the surface of the heating surface of the diversion plate shall be inspected. The flatness tolerance shall be less than 0.1 mm, the roughness Ra shall be less than or equal to 12.5 μm, and the flatness shall be less than or equal to 0.1 mm.

4. The heating treatment process for the tension-resistant drainage plate according to claim 1, characterized in that, In step S6, the thickness of the grease coating is 0.1-0.2 mm.

5. The heating treatment process for the tension-resistant drainage plate according to claim 1, characterized in that, In step S8, when replacing bolts, the nuts, washers, and elastic washers are replaced; for double bolts, they are tightened sequentially; for four bolts, they are tightened diagonally.

6. The heating treatment process for the tension-resistant drainage plate according to claim 1, characterized in that, In step S9, when inspecting the contact surfaces of the two diversion plates, it is necessary to check the stress on the contact surfaces and the sealing of the joints; when inspecting the bolts, it is necessary to check the bolt specifications, the specifications of the washers and elastic washers, and the tightening torque.

7. The heating treatment process for the tension-resistant drainage plate according to claim 1, characterized in that, When installing a shunt line, install the receiving side first and then the supplying side; when removing a shunt line, remove the supplying side first and then the receiving side.

8. The heating treatment process for the tension-resistant drainage plate according to claim 1, characterized in that, In step S11, when detecting the contact resistance of the contact surfaces of the two drain plates, it is necessary to ensure that the resistance value is less than 20μΩ.

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