A method for laying and assembling photovoltaic panels and transformer substation equipment in a booster station area

Abstract

A method for laying and assembling photovoltaic panels and their transformer substation equipment in a booster station area, including the following steps: S1, making and installing steel platform brackets; S2, installing and wiring photovoltaic panels; S3, transporting and hoisting box-inverter integrated machine; S4, installing and debugging box-inverter integrated machine; S5, installing junction box; S6, installing lightning protection and grounding in photovoltaic plant area; S7, laying and wiring cables. One-time excellence, no large-scale rework; no one-sided pursuit of visual quality, violation of quality and process standards, no shortcuts for pipes and wires, no one-sided pursuit of beauty and centralized effects; fine steel structure production, accurate installation, dense and full welds, and standardized node welds; correct paint color, consistent color, no flow marks, wrinkles, bubbles, shedding, pollution, and uniform color. Minimize safety hazards and maximize balanced construction.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation engineering in a booster station, and in particular to a method for laying, assembling and constructing photovoltaic panels and transformer equipment in a booster station area. Background Art

[0002] The dividing point between the photovoltaic field and the 220kV substation is the lower port of the 35kV switch cabinet of the substation. The 35kV incoming cables and optical cables of the photovoltaic field and the photovoltaic field box-type transformer (box-type inverter integrated machine) ring network cabinet are provided by the general contractor. The construction of the 35kV incoming cables and optical cables of the photovoltaic field is within the scope of this bidding section (excluding cable trenches and cable racks). The box-type transformer ring network cabinet is supplied by the box-type transformer manufacturer of this bidding section, and the substation section is responsible for the installation. If necessary, the box-type transformer manufacturer of this bidding section shall provide installation technical support, and the subcontractor shall cooperate to connect the optical cable to the ring network cabinet. The average annual radiation value of the site area of ​​the 500MW EPC project in Section I of the 1000MW photovoltaic project is 5860.5MJ / m2, and the annual sunshine hours are between 2700 hours and 3200 hours. According to GB / T31155-2014 "Total Radiation of Solar Resource Level", the area where this photovoltaic project is located belongs to the "very rich resources" area, and the stability Rw is 0.36, which belongs to the stable (B) area, suitable for the construction of large photovoltaic power stations. The general layout of the construction should include the overall division of the construction site, traffic organization, temporary buildings, construction water and power supply, material stacking, and reasonable layout and vertical planning of equipment storage. The general layout of the construction should meet the following requirements: the overall layout should be reasonable, and the site allocation should be adapted to the construction tasks of each section. The terrain should be used reasonably to reduce the amount of earthwork for site leveling. It is advisable to use the unbuilt and slow-built locations on the site to save land and reduce the investment in temporary facilities and on-site transportation costs. The construction zoning should comply with the overall construction deployment and construction process requirements, and the various processes should not interfere with each other. The requirements of civilized construction should be met. In view of the characteristics of this project, combined with previous construction experience, the construction plan and construction process should be reasonably arranged, the work instructions should be explained, technical guidance and service should be provided during construction, technical problems encountered by construction personnel during construction should be solved in a timely manner, and some technical problems should be solved before construction as much as possible. In view of the above problems, a method for laying and assembling photovoltaic panels and their substation equipment in the booster station area is proposed. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned existing deficiencies and provide a method for laying, assembling and constructing photovoltaic panels and their substation equipment in a booster station area.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for laying and assembling photovoltaic panels and their substation equipment in a booster station area, comprising the following steps:

[0005] S1, fabrication and installation of steel platform support;

[0006] S2, installation and wiring of photovoltaic panels;

[0007] S3, transportation and hoisting of box-type inverter;

[0008] S4, installation and commissioning of box-type inverter;

[0009] S5, combiner box installation;

[0010] S6, Lightning protection and grounding installation in photovoltaic plant area;

[0011] S7, cable laying and wiring.

[0012] Preferably, the specific operation steps of manufacturing and installing the steel platform bracket in step S1 are:

[0013] S11, select appropriate steel materials and accessories according to the design drawings, including steel plates, angle steels, I-shaped steels, bolts, welding rods, etc.;

[0014] S12, cutting, welding and assembly. When the materials and accessories are ready, cutting, welding and assembly shall be carried out according to the design drawings;

[0015] S13, surface treatment and anti-corrosion treatment. After the platform is manufactured, surface painting and anti-corrosion treatment are required;

[0016] S14, prepare necessary materials. After the steel platform installation location is selected, it is necessary to prepare necessary materials and equipment, including welding machines, welding rods, drill bits, screwdrivers, screws, etc.;

[0017] S15, before installing the steel platform, the support frame needs to be installed first, which needs to be constructed according to the design and installation steps;

[0018] S16, after the support frame is installed, the steel platform needs to be connected to the support frame, and screws and bolts need to be used for fixing during the connection;

[0019] S17, after the steel platform is installed, the frame and guardrail need to be installed.

[0020] Preferably, the specific operation steps of the photovoltaic panel installation and wiring in step S2 are:

[0021] S21. According to the installation drawing, measure and mark the installation position of the first component on the closest diagonal beam. The installation should start from the middle of each row and extend to both ends. First, determine the position of the first component in the middle, fix the installation purlin with the purlin connector, place the first component on the square tube, and insert the bolts into the bolt holes for fixing the battery component. Make sure that the center of the long side of the component is on the square tube and the long side is perpendicular to the square tube. You can use a level to measure, align the components and tighten all fasteners. Repeat the above steps to install the remaining components.

[0022] S22, after the photovoltaic panels are installed and the supervisor is notified of the acceptance, the photovoltaic panels are wired and the wiring method of the panels is determined according to the power station design drawings.

[0023] Preferably, the specific operation steps of transporting and hoisting the box-type inverter in step S3 are:

[0024] S31. After the box inverter is transported to the destination, all the lifting points on the box inverter body should be used at the same time when the equipment is installed and hoisted as a whole. The lifting equipment provided with the equipment must be used. The box inverter uses 4 steel wire ropes of equal length to reliably connect the crane hook and the box inverter lifting ear. Then the crane slowly lifts the hook. The hook must be lifted in a vertical position and must not be lifted obliquely or pulled obliquely. When lifting the box inverter, the angle between the steel wire rope and the plumb line must not be greater than 45°. When the box inverter begins to receive the pulling force of the crane and the steel wire rope is straight and does not shake, fine-tune the boom to ensure that the box inverter does not swing too much from front to back and left to right after it is suspended in the air, and does not collide with the truck guardrail to damage the box shell. After fine-tuning, continue to lift the hook. When the bottom of the box inverter is about 30 cm away from the truck chassis, stop lifting the hook for at least 30 seconds and check the safety of the steel wire rope and Check whether each force point is appropriate and whether the force is even. Only when it is confirmed that there are no problems with each part can the lifting be continued. The box inverter is hoisted to the bottom of the box inverter is more than 0.5 meters above the chassis of the truck. The box inverter does not sway back and forth or left and right before it can be moved horizontally. When the box inverter moves to the top of the steel platform of the box inverter, slowly lower the hook until the box inverter is about 0.5 meters from the ground, then the hook stops descending. Reasonably adjust the placement direction of the box inverter, and then slowly lower it. One person is set at the four corners of the box inverter to adjust the angle and position at all times to ensure that the base position of the box inverter is aligned with the foundation position until the box inverter is completely lowered. If the base position is not aligned with the foundation position, the box inverter should be re-raised to an appropriate height, and then the boom should be lowered to adjust the angle position until the box inverter is completely lowered until the position of the box inverter is aligned with the foundation position;

[0025] S32, after the box inverter is completely lowered, it is necessary to measure whether the base of the box inverter is stable and whether the box inverter is level. If there is a problem, it is necessary to add a steel plate under the base of the box inverter until the box inverter is level and stable.

[0026] Preferably, the specific operation steps of installing and debugging the inverter in step S4 are:

[0027] S41, mark the center line of the transformer on the foundation surface. When placing it in place, determine the direction and make the center line of the transformer coincide with the center line of the foundation. The foundation channel steel of the box-type transformer and the embedded parts of the civil foundation should be reliably welded and fixed, and the grounding terminal of the transformer should be reliably connected to the grounding grid;

[0028] S42, taking oil samples from the transformer, if the oil sample is unqualified, the transformer oil needs to be completely filtered;

[0029] S43, carry out relevant routine tests and insulation tests on the transformer body, check whether the mechanical parts are flexible and correct, whether all parts are complete, and focus on checking, adjusting and testing the switches in the switch cabinet.

[0030] Preferably, the specific operation steps of installing the combiner box in step S5 are:

[0031] S51, Check before installing the combiner box:

[0032] S511, the components in the combiner box should be intact and the connecting wires should not be loose;

[0033] S512, all switches and fuses in the combiner box should be in the disconnected state;

[0034] S513, the insulation resistance between the inlet and outlet terminals of the combiner box and the ground terminal of the combiner box should not be less than 20MΩ;

[0035] S52, combiner box installation:

[0036] The brackets and fixing bolts used are all rust-proof parts. When installing the combiner box, the vertical deviation of the installed combiner box should be less than 1.5mm. Before connecting the cables of the PV module string in the combiner box, it must be confirmed that there are obvious disconnection points on the PV module side and the inverter side.

[0037] Preferably, the specific operation steps of the photovoltaic plant lightning protection and grounding installation in step S6 are:

[0038] S61, the flat steel specifications are measured with a vernier caliper, and the width and thickness are required to meet the design requirements. Visually inspect the appearance of the flat steel, and the galvanized layer is required to be uniform and free of rust. Spot check the surface of the galvanized layer by hammering, and the galvanized layer is required to be free of peeling;

[0039] S62, the welding lap length of the grounding flat steel shall not be less than twice the width of the flat steel, and welding is required on three sides. After removing the welding slag, the surface shall be painted with epoxy asphalt paint for corrosion protection. The inverter and box-type transformer grounding bodies shall lead out at least two grounding flat steels, painted with yellow-green interval paint, and holes shall be left at the lead-out end of the flat steel for PE grounding of electrical equipment;

[0040] S63, connect the grounding hole on the battery assembly, use the grounding two-color wire to make the wire nose connection, repeat the above steps to connect each assembly in a row with copper wire, after connecting the last assembly, connect the end of the copper wire to the square tube, finally, connect the two ends of each unit assembly to the main grounding grid respectively;

[0041] S64, connect the positive and negative poles of the M4 plug-in of the component in series to a single loop, use a cable tie to fix the connecting wire to the mounting hole of the designated component frame, and connect the positive and negative terminals of the connector.

[0042] Preferably, the specific operation steps of the cable laying and wiring in step S7 are:

[0043] S71, after cleaning the cable trench to ensure that there are no hard objects such as stones in the trench, the cable is laid by combining manpower and machinery, and then manually arranged and fixed, and the cable conveyor is used to lay large-section and long-distance cables;

[0044] S72, connect and make ends of cables. Use a unified mold for connection and wiring to keep the bending curvature of the wire core consistent, the wire harness is neatly tied, and the spacing is consistent. The low-voltage power cable ends are made by dry packaging. The high-voltage cable ends are made as soon as possible after laying. Otherwise, moisture-proof measures need to be taken. Cold shrink cable ends are used for production;

[0045] S73, the reserved length of the cable should be appropriately considered at the cable connector location, and the reserved length should comply with the technical specifications.

[0046] Compared with the prior art, the invention has the following beneficial effects: excellent quality in one go, no large-scale repair; no one-sided pursuit of visual quality, violation of quality and process standards, no shortcuts in pipes and wires, no one-sided pursuit of beauty and centralized effects; fine steel structure production, accurate installation, dense and full welds, and standardized node welds; correct and consistent paint color, no flow marks, wrinkles, bubbles, shedding, pollution, and uniform color. Minimize safety hazards and maximize balanced construction. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only 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.

[0048] The present invention provides a technical solution: a method for laying and assembling photovoltaic panels and transformer substation equipment in a booster station area, comprising the following steps:

[0049] S1, fabrication and installation of steel platform support;

[0050] S2, installation and wiring of photovoltaic panels;

[0051] S3, transportation and hoisting of box-type inverter;

[0052] S4, installation and commissioning of box-type inverter;

[0053] S5, combiner box installation;

[0054] S6, Lightning protection and grounding installation in photovoltaic plant area;

[0055] S7, cable laying and wiring.

[0056] The photovoltaic module bracket is composed of front and rear columns, diagonal braces and diagonal beams. The photovoltaic panels are fixed to the bracket by bolts, and the rest of the connections are connected with ordinary galvanized bolts.

[0057] Before installing the poles, install the front and rear columns first, then install the diagonal beams, diagonal tie rods and the top connectors to ensure that the surface of each group of solar panels is flat. In each array, install the poles at both ends and the middle pole first, and use a level to control the connection elevation of the top of the pole. When installing the middle pole, straighten the steel wire between the two poles and install the other poles. After the poles are installed and adjusted, install the tie rods, tighten them, check the verticality of the columns to ensure that they meet the requirements, and install the main beams, secondary beams, connectors, accessories, etc. in turn. After each row of poles is installed, install the tie rods between the rear legs in time to ensure the stability of the columns along the longitudinal direction and prevent deformation.

[0058] The front and rear diagonal braces and crossbeams need to be installed in coordination, forming an angle of 34° with the horizontal plane. During installation, the front and rear diagonal braces are connected to the clamp connection, and then the crossbeam is fixed to the steel column. The crossbeam angle is adjusted in coordination to form a 34° angle with the horizontal plane, and then the other end of the diagonal brace is fixed to the crossbeam with bolts, and then the spacing and angle are checked and adjusted in detail to meet the requirements.

[0059] Before installation, the quality of the spiral pile must be checked to see if the pile pipe mouth is deformed, and whether the depth and verticality meet the design requirements. The spiral pile and the hole must be inspected and meet the requirements before installation.

[0060] The openings on the purlins correspond to the openings on the beams. After the beams and diagonal braces are adjusted to meet the requirements, the purlins and diagonal beams are fixed together by bolts through the purlin brackets. The function of the diagonal brace is to prevent the plane deformation of the bracket. A set of diagonal braces is set between two adjacent columns. The diagonal brace is a basket bolt, which is set diagonally along the component surface.

[0061] Preferably, the specific operation steps of manufacturing and installing the steel platform bracket in step S1 are:

[0062] S11, select appropriate steel materials and accessories according to the design drawings, including steel plates, angle steels, I-shaped steels, bolts, welding rods, etc.;

[0063] In order to ensure the quality and safety of the platform, high-quality materials and accessories need to be selected.

[0064] S12, cutting, welding and assembly. When the materials and accessories are ready, cutting, welding and assembly shall be carried out according to the design drawings;

[0065] S13, surface treatment and anti-corrosion treatment. After the platform is manufactured, surface painting and anti-corrosion treatment are required;

[0066] Among them, welding needs to ensure reliable quality and no defects.

[0067] S14, prepare necessary materials. After the steel platform installation location is selected, it is necessary to prepare necessary materials and equipment, including welding machines, welding rods, drill bits, screwdrivers, screws, etc.;

[0068] To improve the service life and aesthetics of the platform.

[0069] S15, before installing the steel platform, the support frame needs to be installed first, which needs to be constructed according to the design and installation steps;

[0070] S16, after the support frame is installed, the steel platform needs to be connected to the support frame, and screws and bolts need to be used for fixing during the connection;

[0071] S17, after the steel platform is installed, the frame and guardrail need to be installed.

[0072] Preferably, the specific operation steps of the photovoltaic panel installation and wiring in step S2 are:

[0073] S21. According to the installation drawing, measure and mark the installation position of the first component on the closest diagonal beam. The installation should start from the middle of each row and extend to both ends. First, determine the position of the first component in the middle, fix the installation purlin with the purlin connector, place the first component on the square tube, and insert the bolts into the bolt holes for fixing the battery component. Make sure that the center of the long side of the component is on the square tube and the long side is perpendicular to the square tube. You can use a level to measure, align the components and tighten all fasteners. Repeat the above steps to install the remaining components.

[0074] During transportation and storage, the solar panels should be handled with care, and should not be subjected to strong impact and vibration, and should not be placed horizontally under heavy pressure.

[0075] The solar panels should be installed from bottom to top, one by one, with the screws installed from inside to outside, and the solar panel bolts should be tightened. During the installation process, they must be handled with care to avoid damaging the protective glass on the surface; the connecting bolts of the solar panels should have spring washers and flat washers. After tightening, the exposed parts of the bolts and nuts should be painted to prevent loosening. And touch up the paint after each installation is completed; the solar panels must be installed horizontally and vertically, and the spacing between the solar panels in the same array should be consistent; pay attention to the direction of the solar panel junction box.

[0076] S22, after the photovoltaic panels are installed and the supervisor is notified of the acceptance, the photovoltaic panels are wired and the wiring method of the panels is determined according to the power station design drawings.

[0077] The wiring process should comply with the following regulations:

[0078] (1) The number and path of PV module connections should meet the design requirements, and the connectors between PV panels should be firmly connected.

[0079] (2) After the PV modules are connected in series, the open circuit voltage and short circuit current of the PV modules should be tested.

[0080] (3) The connecting wires between photovoltaic modules can be fixed with brackets and should be neat and beautiful.

[0081] (4) The positive and negative poles of the same PV module or PV module string should not be short-circuited.

[0082] (5) It is strictly forbidden to touch the metal live parts of the PV module string and it is strictly forbidden to carry out wiring work on the PV module string in the rain.

[0083] Personnel entering the construction site must wear safety helmets. The entire process of crane hoisting must be directed by a dedicated person, and the crane driver must not obey the command of others. However, the emergency stop signal should be executed immediately. During the crane hoisting operation, all personnel should pay attention to safety, and it is strictly forbidden to stand within the crane operation radius. On the day of construction, if there is a level 5 gale or rain or dense fog, hoisting operations are strictly prohibited. In the construction area, relevant personnel are strictly prohibited from chasing and playing, and irrelevant personnel are not allowed to enter the construction area. The crane driver must operate in accordance with the crane operating procedures. When hoisting the box inverter all-in-one machine, the hoisting equipment must be inspected and qualified, and the wire rope must be hung on the hook.

[0084] Preferably, the specific operation steps of transporting and hoisting the box-type inverter in step S3 are:

[0085] S31. After the box inverter is transported to the destination, all the lifting points on the box inverter body should be used at the same time when the equipment is installed and hoisted as a whole. The lifting equipment provided with the equipment must be used. The box inverter uses 4 steel wire ropes of equal length to reliably connect the crane hook and the box inverter lifting ear. Then the crane slowly lifts the hook. The hook must be lifted in a vertical position and must not be lifted obliquely or pulled obliquely. When lifting the box inverter, the angle between the steel wire rope and the plumb line must not be greater than 45°. When the box inverter begins to receive the pulling force of the crane and the steel wire rope is straight and does not shake, fine-tune the boom to ensure that the box inverter does not swing too much from front to back and left to right after it is suspended in the air, and does not collide with the truck guardrail to damage the box shell. After fine-tuning, continue to lift the hook. When the bottom of the box inverter is about 30 cm away from the truck chassis, stop lifting the hook for at least 30 seconds and check the safety of the steel wire rope and Check whether each force point is appropriate and whether the force is even. Only when it is confirmed that there are no problems with each part can the lifting be continued. The box inverter is hoisted to the bottom of the box inverter is more than 0.5 meters above the chassis of the truck. The box inverter does not sway back and forth or left and right before it can be moved horizontally. When the box inverter moves to the top of the steel platform of the box inverter, slowly lower the hook until the box inverter is about 0.5 meters from the ground, then the hook stops descending. Reasonably adjust the placement direction of the box inverter, and then slowly lower it. One person is set at the four corners of the box inverter to adjust the angle and position at all times to ensure that the base position of the box inverter is aligned with the foundation position until the box inverter is completely lowered. If the base position is not aligned with the foundation position, the box inverter should be re-raised to an appropriate height, and then the boom should be lowered to adjust the angle position until the box inverter is completely lowered until the position of the box inverter is aligned with the foundation position;

[0086] S32, after the box inverter is completely lowered, it is necessary to measure whether the base of the box inverter is stable and whether the box inverter is level. If there is a problem, it is necessary to add a steel plate under the base of the box inverter until the box inverter is level and stable.

[0087] Lifting should be carried out by a larger tonnage crane according to the weight of the box inverter. Before using the crane, the condition of the vehicle and the wire rope should be checked. The lifting can only be carried out after the inspection meets the requirements. During lifting, the wire rope must be firmly fixed, and the lifting should be stable to minimize vibration.

[0088] When transporting the box inverter, you should pay attention to protecting the external paint surface. It is best to cover the sling with a carton to prevent it from damaging the outer surface of the box inverter.

[0089] During the transportation of the box inverter, there should be no impact or severe vibration. The center of gravity must be found during hoisting to prevent tilting. The transportation tilt angle should not exceed 15° to prevent deformation of the internal structure of the box inverter.

[0090] Before transporting or loading and unloading the box inverter, the installation direction should be checked to avoid difficulties in changing the direction during installation.

[0091] Before installing the inverter box, check whether the size, elevation and centerline embedded parts of the civil construction part are in accordance with the installation drawing, manufacturer's information and specification requirements.

[0092] Preferably, the specific operation steps of installing and debugging the inverter in step S4 are:

[0093] S41, mark the center line of the transformer on the foundation surface. When placing it in place, determine the direction and make the center line of the transformer coincide with the center line of the foundation. The foundation channel steel of the box-type transformer and the embedded parts of the civil foundation should be reliably welded and fixed, and the grounding terminal of the transformer should be reliably connected to the grounding grid;

[0094] S42, taking oil samples from the transformer, if the oil sample is unqualified, the transformer oil needs to be completely filtered;

[0095] S43, carry out relevant routine tests and insulation tests on the transformer body, check whether the mechanical parts are flexible and correct, whether all parts are complete, and focus on checking, adjusting and testing the switches in the switch cabinet.

[0096] Equipment arrival acceptance Check whether the information attached to the combiner box is complete and check the integrity of each component of the combiner box. After the equipment arrives, take protective measures in time and keep relevant records (handling, storage, packaging, protection).

[0097] Preferably, the specific operation steps of installing the combiner box in step S5 are:

[0098] S51, Check before installing combiner box:

[0099] S511, the components in the combiner box should be intact and the connecting wires should not be loose;

[0100] S512, all switches and fuses in the combiner box should be in the disconnected state;

[0101] S513, the insulation resistance between the inlet and outlet terminals of the combiner box and the ground terminal of the combiner box should not be less than 20MΩ;

[0102] S52, combiner box installation:

[0103] The brackets and fixing bolts used are all rust-proof parts. When installing the combiner box, the vertical deviation of the installed combiner box should be less than 1.5mm. Before connecting the cables of the PV module string in the combiner box, it must be confirmed that there are obvious disconnection points on the PV module side and the inverter side.

[0104] Preferably, the specific operation steps of the photovoltaic plant lightning protection and grounding installation in step S6 are:

[0105] S61, the flat steel specifications are measured with a vernier caliper, and the width and thickness are required to meet the design requirements. Visually inspect the appearance of the flat steel, and the galvanized layer is required to be uniform and free of rust. Spot check the surface of the galvanized layer by hammering, and the galvanized layer is required to be free of peeling;

[0106] S62, the welding lap length of the grounding flat steel shall not be less than twice the width of the flat steel, and welding is required on three sides. After removing the welding slag, the surface shall be painted with epoxy asphalt paint for corrosion protection. The inverter and box-type transformer grounding bodies shall lead out at least two grounding flat steels, painted with yellow-green interval paint, and holes shall be left at the lead-out end of the flat steel for PE grounding of electrical equipment;

[0107] S63, connect the grounding hole on the battery assembly, use the grounding two-color wire to make the wire nose connection, repeat the above steps to connect each assembly in a row with copper wire, after connecting the last assembly, connect the end of the copper wire to the square tube, finally, connect the two ends of each unit assembly to the main grounding grid respectively;

[0108] S64, connect the positive and negative poles of the M4 plug-in of the component in series to a single loop, use a cable tie to fix the connecting wire to the mounting hole of the designated component frame, and connect the positive and negative terminals of the connector.

[0109] Preferably, the specific operation steps of the cable laying and wiring in step S7 are:

[0110] S71, after cleaning the cable trench to ensure that there are no hard objects such as stones in the trench, the cable is laid by combining manpower and machinery, and then manually arranged and fixed, and the cable conveyor is used to lay large-section and long-distance cables;

[0111] S72, connect and make ends of cables. Use a unified mold for connection and wiring to keep the bending curvature of the wire core consistent, the wire harness is neatly tied, and the spacing is consistent. The low-voltage power cable ends are made by dry packaging. The high-voltage cable ends are made as soon as possible after laying. Otherwise, moisture-proof measures need to be taken. Cold shrink cable ends are used for production;

[0112] S73, the reserved length of the cable should be appropriately considered at the cable connector location, and the reserved length should comply with the technical specifications.

[0113] (2) Key points for direct buried cable laying control:

[0114] 1) The path selection for direct buried cables should comply with the following provisions:

[0115] a. Avoid areas with strong acid or alkali corrosion or serious electrochemical corrosion caused by stray current.

[0116] b. When there are no protective measures, it is advisable to avoid termite-infested areas, areas affected by heat sources and areas easily damaged by external forces.

[0117] 2) Direct burial cable laying method shall comply with the following provisions:

[0118] a The cable should be laid in a trench, and a soft soil or sand layer with a thickness of not less than 100mm should be laid on the upper and lower sides of the entire length of the cable.

[0119] b. Located in the suburbs or open areas, obvious direction signs or stakes should be erected at intervals of 100m along the straight line of the cable route, at turns or joints.

[0120] 3) When directly buried in non-frozen areas, the depth from the cable sheath to the ground shall not be less than 1.3m; when located in a carriageway or under cultivated land, the depth should be appropriately deepened and should not be less than 1.0m.

[0121] 4) Direct buried cables must not be located directly above or below underground pipelines.

[0122] 5) When directly buried cables cross railways, highways or streets, they should be placed in protective pipes (steel pipes), and the protection range should exceed the roadbed, both sides of the street pavement and the edge of the drainage ditch by more than 0.5m.

[0123] 6) For cables introduced into structures laid directly under burial, protective pipes should be installed at the holes through the walls and the pipe openings should be blocked with water-blocking devices.

[0124] 7) The joint configuration of direct buried cables shall comply with the following provisions:

[0125] a. The net distance between the joint and the adjacent cable shall not be less than 0.25m.

[0126] b The joint positions of parallel cables should be staggered, and the net distance should not be less than 0.5m.

[0127] c. The joints on sloping terrain should be placed horizontally.

[0128] d For the cable joints of important circuits, the cables should be laid in local sections starting from about 1.0m on both sides, with a spare amount left.

[0129] 8) When direct buried cables are laid using special soil replacement and backfilling, the backfill soil should be non-corrosive to the cable outer sheath.

[0130] The cable head production work should be done by professional technicians. Our company arranges experienced technicians to cooperate, and the supervisory engineer is requested to stand by. The technicians must carefully check the drawings. When wiring, use a unified mold to keep the bending curvature of the wire core consistent, the wire harness is tied neatly, the spacing is consistent, and it meets the process requirements.

[0131] The cable head should be made as soon as possible after the high-voltage cable is laid, otherwise it is necessary to take measures to prevent wind, sand and moisture. The cold shrink cable head should be made. After the cable head is made, a pressure test should be carried out and the cable protective cover should be restored in time.

[0132] The material specifications of the cable protection tube should meet the design requirements, with no cracks or dents on the surface, a smooth inner wall, complete coating and no rust.

[0133] The processing of cable tubes shall meet the following requirements: the cable tubes shall be cold-bent by hydraulic tube bender, and there shall be no concave phenomenon after bending, and the degree of flattening shall not be greater than 10% of the outer diameter of the tube. The bending radius of the cable tube shall not be less than the minimum allowable bending radius of the inserted cable. The inner wall of the pipe after bending shall be free of burrs and sharp edges.

[0134] Cable fire blocking

[0135] 1) Select organic fire-retardant plugging materials, fire-retardant coatings and other materials with specifications and models that meet the design requirements. First, pile up a layer of refractory bags where fire protection is required, and then apply organic plugging materials on the refractory bags to seal the gaps between bags tightly, then pile up another layer of refractory bags, and then apply organic plugging materials; repeat this process until the required height is reached.

[0136] 2) Fire-blocking partitions and cable holes should be sealed. Fire-blocking partitions should be set up; fire-proof sealing should be carried out in the areas leading to control cabinets and other electrical equipment; the openings where cables pass through partitions and holes, and where cables are led to electrical cabinets, panels or control screens, should also be sealed.

[0137] 3) For sealing small holes in the wall, inorganic plugging materials and organic plugging materials should be used together. For example, when the cable is led to the opening of the electrical cabinet, panel or control screen or table. First, the metal frame should be riveted with nails under the hole to facilitate the placement of the partition, and the riveted points should be sealed with organic plugging materials to prevent the flame from burning the riveted points. Then, the cable in the hole should be wrapped with organic plugging materials with a thickness of 10 cm to facilitate the loosening and replacement of the cable. Then, the inorganic plugging materials should be directly poured into the gap to make it flush with the plane of the interlayer. In a fire, the organic plugging materials will expand and foam rapidly to prevent the heat from being transferred to the other side, while the inorganic plugging material layer will mainly prevent the heat from being transferred through heat insulation.

[0138] 4) After the cable laying is completed, the construction unit and the supervision unit should be asked to conduct acceptance of the hidden works, make records and sign.

[0139] Requirements for civilized construction on site

[0140] (1) The project department shall make unified plans and manufacture construction guardrails, power boxes, project signs, etc. according to the requirements.

[0141] (2) Hang slogans, colorful flags, bulletin boards, etc. that convey the commitment to safety, civilization and quality assurance in the construction area.

[0142] (3) Project management personnel and construction team members must wear uniform clothing and badges. They must strictly follow relevant regulations when entering the construction site, wear necessary safety protection equipment, and strictly follow civilized construction requirements when working.

[0143] (4) The civilized and sanitary conditions of the project office area and living area are subject to supervision and inspection by the construction unit and the supervision unit, and are included in the assessment scope.

[0144] (5) Make internal divisions within the civilized construction responsibility areas assigned by the construction unit and the supervisor, and set up signs and plaques that meet the standards.

[0145] (6) Each construction site must follow the civilized construction principle of "work completed, materials used up, site cleared", and clean up at all times and every day, and the remaining materials must be recycled in a timely manner, and garbage and waste must be removed in a timely manner to prevent pollution to the environment.

[0146] (7) Strictly abide by the overall layout management, ensure that the factory roads and drainage ditches are unobstructed, important storage areas such as oxygen stations and acetylene stations are equipped with obvious warning signs, and complete fire-fighting facilities are provided.

[0147] (8) Obvious signs shall be set up at the construction site, which shall include: project name, construction unit, design unit, construction unit, supervision unit, project manager, start and completion dates, construction permit approval number, safe and civilized construction zone division map, person in charge of safe and civilized construction, etc.

[0148] (9) The construction roads, power supply, water source and communication are in place, the factory site is flat, the fences and construction road lighting are properly configured, and security personnel are on duty.

[0149] (10) Earthwork, materials and equipment are stacked reasonably, neatly and safely, and the site drainage and fire-fighting facilities are complete and can meet the needs of construction.

[0150] (11) Construction vehicles and mechanical equipment are in good condition, clean, and neatly arranged, with complete safety operating procedures. Operators are certified and familiar with the mechanical properties and working conditions.

[0151] (12) The construction facilities are complete, properly arranged, the environment is clean, the offices, tool rooms and other places are neat and tidy, and the relevant responsibilities and regulations are complete.

[0152] (13) Construction and living areas shall be equipped with fixed garbage bins or garbage pools as required by Party A, and garbage passages shall be set up during the construction of high-rise buildings. Party B shall be responsible for the removal of garbage.

[0153] (14) Strive to eliminate the “five ends” (cigarette butts, brick butts, waste butts, cable butts, and welding butts) at the construction site.

[0154] (15) Vehicles entering the construction site, including motorcycles and bicycles, must be parked at designated locations.

[0155] (16) Temporary entrances and exits of buildings should be equipped with safety sheds, safe passages, and clear safety warning signs.

[0156] (17) The pits, hole covers, fences, and platform railings on site are complete, clearly color-coded, and equipped with eye-catching safety warning signs.

[0157] (18) All types of scaffolding must be erected and dismantled by professional scaffolders, have a reasonable and sturdy structure, and be put into use after acceptance. The content of the sign must meet the requirements and be complete.

[0158] (19) The construction power supply must comply with safety regulations, adopt a three-phase five-wire system for centralized management, uniform layout, clear responsibilities, clear safety warning signs, and a sound management system.

[0159] (20) The electrical wiring is standardized, beautiful, reliably connected, numbered correctly and completely, and the cable holes are properly sealed.

[0160] (21) Ladders, platforms and railings should be aesthetically pleasing and should be improved in a timely manner as the project progresses and meet standard requirements.

[0161] (22) It is imperative to protect the finished product. Whoever performs the construction shall be responsible for supervision before the equipment is handed over. It is prohibited to scribble on the equipment or cause other secondary pollution.

[0162] 9.3 On-site civilized construction measures

[0163] 1) Organize the construction strictly in accordance with the construction organization design and professional design approved by the owner and the supervision company, and standardize the construction operations.

[0164] 2) The construction work instructions contain specific requirements for civilized construction, which must be strictly implemented during construction. During construction, construction must be carried out strictly in accordance with the arrangements of the project department's production scheduling meeting to ensure that the procedures and process flows are reasonable, closely connected, and balanced construction is achieved.

[0165] 3) Obey the unified arrangements of the project legal person and the supervision company, cooperate well with other construction units, do a good job in the management of the overall plan, improve the utilization rate of the site, and ensure that the on-site construction is tight and orderly.

[0166] 4) Strictly control the installation process level and strictly implement process discipline to ensure that it complies with relevant specifications and inspection requirements.

[0167] 5) The living area and office area of ​​this project are managed in a closed manner, and special personnel are arranged to be on duty in the living area and office area.

[0168] 6) Set up road signs and warning signs on the main roads of the construction site; clean up and sort out the garbage and waste within the construction area to keep the roads and sites clean at all times. Harden the gravel yard of the mixing station.

[0169] 7) Smoking is prohibited at the construction site, and a smoking room (shed) must be set up.

[0170] 8) The on-site construction power supply is uniformly planned and arranged, and a four-level power supply system is adopted. The first level is the main transformer main power supply, the second level is each main branch panel (including the main power supply of each large equipment), the third level is the construction site power panel, and the fourth level is the mobile power supply panel at each work point. The power panels below the second level are all equipped with leakage circuit breakers. Cantonese lighting is used on the construction site.

[0171] 9) Electric welding machine handle wires, power cables and lighting cables are laid in bundles.

[0172] 10) Unified planning of construction water supply to ensure that all major construction sites and on-site offices have sufficient water sources, and systematic consideration of factory drainage issues

[0173] 11) Strictly control the vehicles on site. Drivers must wear helmets when leaving the vehicles. The speed of vehicles in the construction area must be limited and random parking is not allowed.

[0174] 12) The safety signs on site shall be planned in a unified manner. No one may move or use the safety facilities, safety propaganda boards, and safety signs on the construction site for other purposes without the consent of the relevant departments.

[0175] 13) Divide the civilized construction responsibility areas into sections and set up responsibility signs; establish a cleaning team managed by the safety supervision department to ensure that the environmental sanitation of the construction production area and living area is in good condition; ensure that there are no "three heads" at the construction site, namely welding rod heads, lead wire heads, and cigarette butts; no "three bags", namely plastic bags, cement bags, and food bags; no "three wastes", namely waste materials, waste wood, and waste cable (wire) heads; secondary wiring and cable heads are stripped and cleaned as they are made.

[0176] 14) Equipment and materials are managed in a fixed location. Materials are stacked in an orderly manner, with clear specifications and quantity labels. It is strictly forbidden to stack equipment and materials on site for a long time. The use of materials is subject to quota management. It is strictly forbidden to randomly stack equipment and materials on site, so as to achieve "the site is clear after the work is completed and the materials are used up". If the equipment and materials cannot be installed and used up within three days, the construction unit shall return them to the equipment storage site or material warehouse. The construction site should always be kept tidy and the passages unobstructed. Oil and dangerous goods should be kept in special custody. Oil depots and dangerous goods depots should be far away from the construction site and residential areas, and should be set up in accordance with the requirements of the regulations.

[0177] 15) Civilized construction inspection and assessment. The assessment strictly follows the "Electric Power Construction Civilized Construction Assessment Form" of the former Ministry of Electric Power and the implementation rules formulated for this project, and the responsibilities are assigned to individuals according to the civilized construction responsibility signs. The assessment items are divided into: project management and site management in the preparation stage; project management, site management and process level in the construction stage. Those who fail to meet the assessment standards will be ordered to make immediate rectifications and be punished according to the relevant regulations of the company.

[0178] Compared with the prior art, the invention has the following beneficial effects: excellent quality in one go, no large-scale repair; no one-sided pursuit of visual quality, violation of quality and process standards, no shortcuts in pipes and wires, no one-sided pursuit of beauty and centralized effects; fine steel structure production, accurate installation, dense and full welds, and standardized node welds; correct and consistent paint color, no flow marks, wrinkles, bubbles, shedding, pollution, and uniform color. Minimize safety hazards and maximize balanced construction.

[0179] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for laying and assembling photovoltaic panels and substation equipment in a booster station area, characterized in that: The following steps are involved: S1, fabrication and installation of steel platform support; S2, installation and wiring of photovoltaic panels; S3, transportation and hoisting of box-type inverter; S4, installation and commissioning of box-type inverter; S5, combiner box installation; S6, Lightning protection and grounding installation in photovoltaic plant area; S7, cable laying and wiring.

2. A method for laying and assembling photovoltaic panels and substation equipment in a booster station area according to claim 1, characterized in that: The specific steps of manufacturing and installing the steel platform bracket in step S1 are as follows: S11, select appropriate steel materials and accessories according to the design drawings, including steel plates, angle steels, I-shaped steels, bolts, welding rods, etc.; S12, cutting, welding and assembly. When the materials and accessories are ready, cutting, welding and assembly shall be carried out according to the design drawings; S13, surface treatment and anti-corrosion treatment. After the platform is manufactured, surface painting and anti-corrosion treatment are required; S14, prepare necessary materials. After the steel platform installation location is selected, it is necessary to prepare necessary materials and equipment, including welding machines, welding rods, drill bits, screwdrivers, screws, etc.; S15, before installing the steel platform, the support frame needs to be installed first, which needs to be constructed according to the design and installation steps; S16, after the support frame is installed, the steel platform needs to be connected to the support frame, and screws and bolts need to be used for fixing during the connection; S17, after the steel platform is installed, the frame and guardrail need to be installed.

3. A method for laying and assembling photovoltaic panels and substation equipment in a booster station area according to claim 1, characterized in that: The specific operation steps of the photovoltaic panel installation and wiring in step S2 are as follows: S21. According to the installation drawing, measure and mark the installation position of the first component on the closest diagonal beam. The installation should start from the middle of each row and extend to both ends. First, determine the position of the first component in the middle, fix the installation purlin with the purlin connector, place the first component on the square tube, and insert the bolts into the bolt holes for fixing the battery component. Make sure that the center of the long side of the component is on the square tube and the long side is perpendicular to the square tube. You can use a level to measure, align the components and tighten all fasteners. Repeat the above steps to install the remaining components. S22, after the photovoltaic panels are installed and the supervisor is notified of the acceptance, the photovoltaic panels are wired and the wiring method of the panels is determined according to the power station design drawings.

4. A method for laying and assembling photovoltaic panels and substation equipment in a booster station area according to claim 1, characterized in that: The specific operation steps of transporting and hoisting the inverter in step S3 are as follows: S31. After the box inverter is transported to the destination, all the lifting points on the box inverter body should be used at the same time when the equipment is installed and hoisted as a whole. The lifting equipment provided with the equipment must be used. The box inverter uses 4 steel wire ropes of equal length to reliably connect the crane hook and the box inverter lifting ear. Then the crane slowly lifts the hook. The hook must be lifted in a vertical position and must not be lifted obliquely or pulled obliquely. When lifting the box inverter, the angle between the steel wire rope and the plumb line must not be greater than 45°. When the box inverter begins to receive the pulling force of the crane and the steel wire rope is straight and does not shake, fine-tune the boom to ensure that the box inverter does not swing too much from front to back and left to right after it is suspended in the air, and does not collide with the truck guardrail to damage the box shell. After fine-tuning, continue to lift the hook. When the bottom of the box inverter is about 30 cm away from the truck chassis, stop lifting the hook for at least 30 seconds and check the safety of the steel wire rope and Check whether each force point is appropriate and whether the force is even. Only when it is confirmed that there are no problems with each part can the lifting be continued. The box inverter is hoisted to the bottom of the box inverter is more than 0.5 meters above the chassis of the truck. The box inverter does not sway back and forth or left and right before it can be moved horizontally. When the box inverter moves to the top of the steel platform of the box inverter, slowly lower the hook until the box inverter is about 0.5 meters from the ground, then the hook stops descending. Reasonably adjust the placement direction of the box inverter, and then slowly lower it. One person is set at the four corners of the box inverter to adjust the angle and position at all times to ensure that the base position of the box inverter is aligned with the foundation position until the box inverter is completely lowered. If the base position is not aligned with the foundation position, the box inverter should be re-raised to an appropriate height, and then the boom should be lowered to adjust the angle position until the box inverter is completely lowered until the position of the box inverter is aligned with the foundation position; S32, after the box inverter is completely lowered, it is necessary to measure whether the base of the box inverter is stable and whether the box inverter is level. If there is a problem, it is necessary to add a steel plate under the base of the box inverter until the box inverter is level and stable.

5. The method for laying and assembling photovoltaic panels and substation equipment in a booster station area according to claim 1 is characterized in that: The specific operation steps for installing and debugging the inverter in step S4 are as follows: S41, mark the center line of the transformer on the foundation surface. When placing it in place, determine the direction and make the center line of the transformer coincide with the center line of the foundation. The foundation channel steel of the box-type transformer and the embedded parts of the civil foundation should be reliably welded and fixed, and the grounding terminal of the transformer should be reliably connected to the grounding grid; S42, taking oil samples from the transformer, if the oil sample is unqualified, the transformer oil needs to be completely filtered; S43, carry out relevant routine tests and insulation tests on the transformer body, check whether the mechanical parts are flexible and correct, whether all parts are complete, and focus on checking, adjusting and testing the switches in the switch cabinet.

6. A method for laying and assembling photovoltaic panels and substation equipment in a booster station area according to claim 1, characterized in that: The specific operation steps of the combiner box installation in step S5 are as follows: S51, Check before installing the combiner box: S511, the components in the combiner box should be intact and the connecting wires should not be loose; S512, all switches and fuses in the combiner box should be in the disconnected state; S513, the insulation resistance between the inlet and outlet terminals of the combiner box and the ground terminal of the combiner box should not be less than 20MΩ; S52, combiner box installation: The brackets and fixing bolts used are all rust-proof parts. When installing the combiner box, the vertical deviation of the installed combiner box should be less than 1.5mm. Before connecting the cables of the PV module string in the combiner box, it must be confirmed that there are obvious disconnection points on the PV module side and the inverter side.

7. A method for laying and assembling photovoltaic panels and substation equipment in a booster station area according to claim 1, characterized in that: The specific operation steps of step S6 photovoltaic plant area lightning protection and grounding installation are: S61, the flat steel specifications are measured with a vernier caliper, and the width and thickness are required to meet the design requirements. Visually inspect the appearance of the flat steel, and the galvanized layer is required to be uniform and free of rust. Spot check the surface of the galvanized layer by hammering, and the galvanized layer is required to be free of peeling; S62, the welding lap length of the grounding flat steel shall not be less than twice the width of the flat steel, and welding is required on three sides. After removing the welding slag, the surface shall be painted with epoxy asphalt paint for corrosion protection. The inverter and box-type transformer grounding bodies shall lead out at least two grounding flat steels, painted with yellow-green interval paint, and holes shall be left at the lead-out end of the flat steel for PE grounding of electrical equipment; S63, connect the grounding hole on the battery assembly, use the grounding two-color wire to make the wire nose connection, repeat the above steps to connect each assembly in a row with copper wire, after connecting the last assembly, connect the end of the copper wire to the square tube, finally, connect the two ends of each unit assembly to the main grounding grid respectively; S64, connect the positive and negative poles of the M4 plug-in of the component in series to a single loop, use a cable tie to fix the connecting wire to the mounting hole of the designated component frame, and connect the positive and negative terminals of the connector.

8. The method for laying and assembling photovoltaic panels and substation equipment in a booster station area according to claim 1 is characterized in that: The specific operation steps of the cable laying and wiring in step S7 are as follows: S71, after cleaning the cable trench to ensure that there are no hard objects such as stones in the trench, the cable is laid by combining manpower and machinery, and then manually arranged and fixed, and the cable conveyor is used to lay large-section and long-distance cables; S72, connect and make ends of cables. Use a unified mold for connection and wiring to keep the bending curvature of the wire core consistent, the wire harness is neatly tied, and the spacing is consistent. The low-voltage power cable ends are made by dry packaging. The high-voltage cable ends are made as soon as possible after laying. Otherwise, moisture-proof measures need to be taken. Cold shrink cable ends are used for production; S73, the reserved length of the cable should be appropriately considered at the cable connector location, and the reserved length should comply with the technical specifications.