CN112366578A - Installation construction method for prefabricated cabin of 110 KV transformer substation - Google Patents
Installation construction method for prefabricated cabin of 110 KV transformer substation Download PDFInfo
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- CN112366578A CN112366578A CN202011207138.0A CN202011207138A CN112366578A CN 112366578 A CN112366578 A CN 112366578A CN 202011207138 A CN202011207138 A CN 202011207138A CN 112366578 A CN112366578 A CN 112366578A
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- 238000009434 installation Methods 0.000 title claims description 36
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- 229910052802 copper Inorganic materials 0.000 claims description 27
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- 238000007791 dehumidification Methods 0.000 claims description 6
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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Abstract
The invention discloses a method for installing and constructing a prefabricated cabin of a 110 KV transformer substation, which specifically comprises the following steps: the method comprises the following steps of unpacking equipment, checking equipment foundations, clearing obstacles, installing equipment in a hoisting mode, adjusting, fastening and checking the equipment, installing accessories, installing a grounding device and installing an electric wiring device. The invention avoids the condition of collision damage when the prefabricated cabin is hoisted, provides a set of perfect operation flow and operation procedures, improves the construction quality, shortens the construction period, ensures the stability and safety of the whole construction, and is easy to popularize.
Description
The technical field is as follows:
the invention is suitable for installation and construction of a prefabricated cabin of a 110 kV transformer substation project, in particular relates to an installation and construction method of the prefabricated cabin of the 110 kV transformer substation, and belongs to the technical field of electric power construction.
Background art:
the prefabricated cabin type transformer substation comprises a prefabricated cabin body, a secondary equipment screen cabinet (or a frame), a high-voltage cabinet, cabin body auxiliary facilities and the like, wherein on-site primary equipment, secondary equipment and the like are placed in 2 equal cabins of the prefabricated cabin, a storage battery prefabricated cabin body and a secondary equipment prefabricated cabin; primary equipment, secondary combined equipment, a storage battery and the like in a prefabricated cabin of the system are manufactured, assembled, wired, debugged and the like in a factory and are integrally transported to an engineering site in a box house form; because the prefabricated cabin body is large, the prefabricated cabin is hoisted to a position prefabricated in advance through a truck crane during installation, and then the prefabricated cabin is lowered to the prefabricated position through commanding and matching of field workers; after the installation is finished, unified debugging is needed, the whole construction workload is large, the construction period is long, the construction details are complicated, and the construction cannot be worn out if the construction details are careless; therefore, a complete construction method is urgently needed.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the method for installing and constructing the prefabricated cabin of the 110 kilovolt transformer substation overcomes the defects of the prior art, provides a normative process standard for the operation basis, the operation resources, the operation flow, the requirements and standards of the operation process, safety measures and the like of an installation project, improves the construction quality and shortens the construction period.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a mounting construction method for a prefabricated cabin of a 110 kV transformer substation comprises the following steps:
1) preparation for construction
A. Preparing a tool for hoisting, and checking whether the prefabricated cabin is damaged or not;
B. clearing up the on-site obstacles, and well taking safety measures of preventing the crane from inclining, collapsing and the like before hoisting
C. After the prefabricated cabin is in place, bending to form a grounding lead model, blanking according to the size of the model, reserving redundancy during blanking, and adopting mechanical cold bending to avoid hot bending from damaging a cast layer in the flat steel bending process; the manufactured grounding lead is connected and fastened with a grounding piece specially arranged in the prefabricated cabin through a bolt;
D. organized drainage construction is carried out, a UPVC pipe is selected as an air conditioner condensate pipe, the installation gradient must meet the design requirement, the cold pipe is as short as possible, and air seal is avoided; when the condensate pipe is long, a suspension mode can be adopted, the distance between the brackets is l-l.2m, the drainage gradient is ensured, condensate water drainage holes are arranged in the foundation of the air conditioner external hanging machine, an organized drainage design is added, and a main pipe of the air conditioner condensate pipe is communicated with a nearby drainage well;
E. when the cable of the prefabricated cabin is laid, the cable is not exposed, the cable groove box or the cable pipe is well grounded, and anti-sinking measures are taken; the alternating current single-core cable cannot be independently penetrated into the copper pipe;
F. the fireproof plugging construction of the cable hole is carried out according to the size of the reserved hole of the cabin body, when the bottom of the prefabricated cabin is plugged, the plugging is tight and reliable, no obvious cracks or visible pores exist, and meanwhile, reliable waterproof measures are taken;
2) the method comprises the following specific operation steps:
A. hoisting the prefabricated cabin: a hoisting mode is adopted, and a hoisting piece at the bottom of the cabin is taken as a hoisting point, so that the two ends of the box body are balanced and cannot be inclined during hoisting;
firstly, lifting the II-type cabin by four points, wherein two points are arranged on each side, and the lifting points are arranged at the lower ends of two sides of the prefabricated cabin; the III-type cabin is hoisted by eight points, four points are arranged on each side, each side is distributed in a cross shape, and the bottoms of the hoisting points are arranged; the hanging points are all pull-type movable hanging points;
secondly, a 25-ton truck crane is adopted, 4 special slings with equal length are used for reliably connecting a crane hook with the prefabricated cabin lifting lug, then the crane slowly lifts the hook, the hook must be in a vertical position for hoisting, and inclined hoisting or inclined pulling is not required; when the prefabricated cabin starts to receive the pulling force of the crane, the prefabricated cabin stays for a moment, and when the steel wire rope is straightened and does not shake, the suspension arm is finely adjusted, so that the case body is ensured to swing in the front-back and left-right directions in an overlarge way after the prefabricated cabin is suspended in the air, and the case body is damaged by collision with a steel structure;
after fine adjustment is finished, the lifting hook is continuously lifted, when the distance between the bottom of the lifting box transformer substation and a steel structure supporting point is about 30cm, the lifting hook is stopped to be lifted for no less than 30 seconds, the safety of the sling rope is checked, whether each stress point is proper or not and whether stress is uniform or not are checked, and continuous lifting can be carried out under the condition that all parts have no problems;
fourthly, the prefabricated cabin is hung to the position, higher than the steel structure top section steel by more than 0.5m, of the bottom of the prefabricated cabin, the hung box is checked to have no forward, backward, leftward and rightward shaking condition, the hung box can move horizontally, when the prefabricated cabin moves to the position above the prefabricated cabin reinforced concrete foundation, the lifting hook is slowly adjusted downwards until the distance between the prefabricated cabin and the steel structure is about 0.5m, the lifting hook stops being adjusted downwards to reasonably adjust the placement direction of the box transformer, then the box transformer is slowly adjusted downwards, and the four corners of the prefabricated cabin are all provided with one person to adjust the angle and the position constantly, so that the base position of the prefabricated cabin is ensured to be aligned with the drawn cross;
fifthly, when the position of the base is not aligned with the position of the cross symbol, the prefabricated cabin is lifted again to a proper height, then the suspension arm is adjusted downwards, the angle position is adjusted until the box transformer substation is completely put down until the position of the prefabricated cabin is aligned with the position of the cross symbol;
after the prefabricated cabin is completely put down, whether the box transformer substation base is stable or not is measured, whether the prefabricated cabin is horizontal or not is measured, and if the prefabricated cabin is not stable, a steel plate needs to be added under the prefabricated cabin base until the prefabricated cabin is horizontally stable; after the prefabricated cabin is checked to be stable and the horizontal measurement meets the requirement, the hanging strip can be detached, and the crane can move back to the field in sequence;
B. and (3) mounting of the prefabricated cabin body:
firstly, welding a prefabricated cabin body chassis by profile steel, wherein the cabin body framework is of a welding and assembling integrated structure and is processed by adopting high-quality carbon structural steel, and the yield strength is not less than 235 MPa; the main structure of the prefabricated cabin framework adopts a high-quality steel plate, and the thickness of the steel plate is not less than 2 mm; the prefabricated cabin is required to be provided with a base for bearing equipment and is formed by welding profile steel, and the main framework structure and the base are welded into a whole; the use of the color steel plate assembled cabin body is not allowed;
secondly, corrosion prevention of the prefabricated cabin: before carrying out anticorrosion operation, enough roughness of the surface of the steel plate is ensured, the thickness of a zinc layer is not less than 60 mu m, and the total thickness of an intermediate layer, a surface layer and the like is not less than 200 mu m;
thirdly, heat preservation of the prefabricated cabin: a double-layer sandwich structure is adopted, polyurethane fireproof heat-insulating materials are adopted as internal fillers, the heat-insulating and fireproof performance of the whole prefabricated cabin is ensured, and an environment-friendly fireproof decoration layer is added; the thickness of the door plate is not less than 45mm, so that the 24-wall heat preservation effect is ensured; an automatic temperature control system is arranged in the cabin body, an industrial heating device is additionally arranged, and a civil electric heater or a fan heater is not adopted, so that the stability of the operating environment in the cabin body is ensured;
fourthly, ventilation of the prefabricated cabin: when forced ventilation is adopted, the fan needs to adopt an imported, long-service-life and maintenance-free axial flow fan; the number of the fans should meet the requirements of air exhaust and dehumidification, multiple dustproof treatments should be carried out on the air exhaust, and the dustproof net should be convenient to disassemble, assemble and clean; structures such as an air valve and the like are required to be arranged at the air exhaust position, so that the integral protection level of the cabin body is ensured; when SF6 electrical equipment is arranged in the box body, an SF6 monitoring and automatic exhaust system is arranged to control the start and stop of an electric air inlet valve and a forced exhaust axial flow fan of the box body, the total ventilation quantity of the electric air inlet valve and the axial flow fan needs to ensure that air in the cabin body is ventilated once every 5 minutes, and the air inlet valve and the axial flow fan need to be provided with good dust removal and filtration devices to ensure that the box body is dustproof;
fifth, construction of cable channel: the laying of the primary and secondary cables in the prefabricated cabin needs special cable channels which are independent and closed; the size of the primary cable channel is designed to meet the requirements of cable laying and reasonable bending radius, and the primary cable channel is reasonably distributed in the prefabricated cabin; the secondary cable channel adopts a metal wire groove;
sixthly, measures for emergency escape of the prefabricated cabin are as follows:
a push-bar type emergency escape door lock is required to be arranged on the prefabricated cabin passage door plate to meet the emergency escape requirement of personnel; the door lock needs to meet the fireproof requirement, and has high reliability and long service life; an emergency escape passage is provided with a striking safety exit indication, and related passage indication equipment needs to consider an emergency power supply so as to ensure the reliable indication of the emergency power supply;
and illumination construction of the cabin body:
a channel illuminating lamp is arranged in the prefabricated cabin overhaul corridor, an LED lamp is adopted as the illuminating lamp, sufficient illumination is ensured, and overhaul and test of the interior of the box body are facilitated; accident illumination is respectively arranged at two ends of a prefabricated cabin overhaul corridor and can be automatically started under the condition of power failure of a total station, so that the accident illumination in the overhaul corridor is ensured;
eighthly, grounding construction of the cabin body:
a special grounding conductor is arranged on a bottom frame of a box body of the prefabricated cabin, a fixed grounding terminal connected with a grounding network is arranged on the grounding conductor, is connected with equipment in the prefabricated cabin in a grounding and protection grounding mode, and has an obvious grounding mark; the grounding terminal is a copper bolt with the diameter not less than 12 mm; the metal framework of the prefabricated cabin, the metal supports of the high power distribution device, the low power distribution device and the transformer room are provided with grounding terminals meeting technical conditions, and the grounding terminals are reliably connected with the special grounding conductor; at least 4 obvious grounding points are arranged outside the underframe of each box body of the prefabricated cabin, the grounding points are welded with a reliable underframe by adopting copper plates and are provided with copper bolts with the diameter not less than 12mm, so that the box bodies are conveniently connected with a basic grounding network on site;
C. and (3) installing and constructing a screen cabinet in the prefabricated cabin:
1) the appearance form and the color of the cabinet in the cabin are uniform, and the identification positions, fonts and heights of the cabinet name, the manufacturer name and the like are consistent; the secondary equipment installation adopts a screen (cabinet) mode or a rack type structure, the secondary equipment cabinets in the cabin are arranged by double rows of adjacent walls, and the centralized interface cabinets are arranged at two ends of the equipment cabinet at the long side;
2) when the equipment in the cabin adopts a screen (cabinet) installation mode:
firstly, a vertical self-standing cabinet structure with an embedded cabinet door is adopted for the screen (cabinet), the front door is preferably a glass door, the rotating shaft of the front-view screen (cabinet) body is arranged on the right side, and the door handle is arranged on the left side;
secondly, the terminal rows are uniformly arranged at the lower part of the cabinet body and adopt a transverse terminal row arrangement mode; the distance between the terminal row and the front door of the cabinet is not more than 75mm, the distance between the terminal row and the side plate of the cabinet is not more than 150mm, and the distance between the terminal row and the ground is not more than 250 mm; the distance between the two rows of terminal rows is not smaller than 100 mm; a redundant tail cable reel collecting space is required to be arranged in the screen (cabinet), and the width of a vertical wire slot is not less than 70 mm;
reserving 1-4 spare cabinet positions for each prefabricated cabin, installing an empty cabinet in a long-term cabinet in the prefabricated cabin at the current stage, reserving related wiring, arranging a permanent spare screen position at a position close to the cabin door, and laying a cover plate;
3) when the cabin is installed by adopting a rack-type structure:
firstly, a basic frame is formed by paired vertical components of a frame configured according to a preset distance, a main body and a prefabricated cabin body are integrally designed, manufactured and installed, internal components can be integrally installed along with the prefabricated cabin body, and the mode of manufacturing outside the cabin and modular installation can also be adopted;
secondly, the devices in the rack are arranged in the middle or in an offset mode, when the devices are arranged in the middle, wiring grooves are arranged on two sides of the devices, optical cables are divided into wiring lines according to the left optical principle and the right optical principle, and terminals in the rack are transversely arranged; when the device is arranged in an offset way, the device is preferably arranged on the left side of the frame, and the inner terminal of the frame is longitudinally arranged on the right side of the frame; the bottom of the whole row of racks is provided with a coherent and open wiring channel, the channel is arranged on the plane of the anti-static floor, and the front surface of the channel is shielded by a quick-release panel;
arranging an air duct in the cabin, directly guiding air outlet of the air conditioner to the inside of the rack, arranging ventilation openings at the top and below each row of racks to form vertical convection air, avoiding local overheating in the rack, and staggering the position of an air outlet with equipment in the rack;
4) and the construction of the electrical and auxiliary facilities of the prefabricated cabin:
firstly, complete safety protection and video monitoring measures are set in the prefabricated cabin, and meanwhile, facilities such as illumination, maintenance, grounding and the like are set, so that the requirements of safe operation of prefabricated cabin equipment and inspection of personnel are met;
secondly, the prefabricated cabin interior lighting system consists of normal lighting and emergency lighting, and the emergency lighting comprises accident lighting and evacuation lighting; the emergency lighting lamp is taken into consideration by partial normal lighting lamps, an AC/DC dual-purpose LED lighting lamp is adopted, a power supply is suitable for being LED from a DC split screen, and an in-station inverter power supply, a UPS power supply or a self-contained storage battery (not less than 120 min) can be adopted for supplying power; when the normal lighting system cannot work, switching to emergency lighting power supply; the evacuation lighting part is provided with a storage battery, the emergency time is not less than 120min, and an evacuation indicating sign with the storage battery is arranged at an outlet;
thirdly, portable fire extinguishers are required to be arranged in the cabin, and the grade and the number of the fire extinguishers are required to be arranged according to the fire hazard class as the medium hazard class; under the condition of ensuring safety and reliability, a fixed gas fire extinguishing system can be arranged;
fourthly, two industrial air-conditioning integrated machines (a main machine and a spare machine) with dehumidification and fault alarm output functions are arranged in the cabin and are installed in a wall-mounted mode; under the extremely low temperature environment, heating equipment or air conditioner heating power should be increased; under the extremely high temperature environment, the refrigeration power of the air conditioner is increased; the ventilation equipment capacity of changing air should meet the requirement of changing air 6 times per hour, and the air duct of the fan should have dustproof and waterproof measures; a filtering device is arranged at an air duct inlet of a fan in a high wind and sand area;
installing video monitoring in the cabin, and arranging 1-2 rotary cameras to effectively monitor the conditions of the prefabricated cabin entrance and exit and the cabin channel; a wired telephone is arranged in the cabin and is installed in a wall-hanging manner; in the cabin; a movable or fixed folding table is arranged; at least one door with an emergency escape function is arranged in the cabin; an intelligent environment control unit is arranged in the cabin to realize the functions of monitoring, controlling and alarming the environment in the cabin;
5) and laying cables in the prefabricated cabin and constructing an interface:
firstly, 1-2 cable channel inlets and outlets communicated with an in-station cable channel are arranged in a cabin, and the connection between secondary equipment in the cabin and optical fibers outside the cabin and the connection between the secondary equipment in the cabin and cables outside the cabin are not in a prefabricated form;
secondly, a tail cable is adopted for optical fiber connection among the cabinets in the cabin, and jump fibers are adopted for the optical fiber connection in the cabinets; wiring among cabinets in the cabin is realized in a mode of wiring in an interlayer of a base of the cabin body, communication cables and cables in the interlayer are laid in a separated mode, the communication cables are preferably provided with wiring groove boxes, and reliable cover plates are arranged at the tops of the groove boxes;
thirdly, when the equipment in the cabin adopts a screen (cabinet) installation mode, cables between screens (cabinets) are wired through wiring grooves in the cabin and then led to the equipment or terminal rows in the screens (cabinets) from wire inlet holes at the bottom of the screens (cabinets); optical cable wiring in a screen (cabinet) is suitable to be arranged on the left and the right, and a wiring way of a wiring groove is adopted;
fourthly, when the equipment in the cabin is installed in a rack type structure mode, an optical cable routing channel is arranged between the two rows of racks and below the anti-static floor; cables between racks in the same row are distributed through the cable distribution channel with the bottom opened at the bottom of the rack, and the cables are downwards led to the cable distribution channel at the bottom from the right side and then led to the target rack internal device and the terminal block through the channel;
fifthly, redundant tail cables and jumping fibers in the cabinet are stored and fixed by a special fiber storage box, so that bending and breaking of the optical fibers are avoided; leading-out wires (jumping fibers) of the tail cables are not tightly bound by a binding belt;
a distribution box, a switch panel, a socket and the like are arranged in the cabin, the height from the bottom of the distribution box to the ground is 1.3m, the switch panel is installed in an embedded mode, the distance from the bottom of the panel to the ground is 1.3m, the distance from the side edge to a door frame is 0.2m, the distance between the panels is not less than 0.02m, and the distance from the bottom edge of the socket to the ground is 0.5 m;
sixthly, cables of equipment such as air conditioners, lighting, security protection, fire protection, environment monitoring and the like in the cabin are in a hidden laying mode, and wires of the prefabricated cabin body are arranged in a hidden row mode through the side wall and the cabin top; the wiring on the cabin top needs to pass through wiring grooves or wiring pipes, and the wiring on the side face of the cabin body needs to be protected through PVC pipes; each air conditioner, lighting, working socket and ventilation are respectively provided with a circuit breaker, and all the circuit breakers are concentrated in a distribution box and have personal safety protection measures and misoperation protection measures; all in-cabin ancillary equipment should have obvious marks;
6) and grounding and anti-interference construction:
firstly, a shielding measure is adopted for a prefabricated cabin, a special copper bar of 2mm is laid on the lower layer of an electrostatic floor of the prefabricated cabin according to the arrangement direction of a cabinet, the head end and the tail end of the special copper bar are connected to form a secondary equipotential grounding net in the prefabricated cabin, the secondary equipotential grounding net is insulated from the cabin body, and the grounding copper bar in the cabinet is connected with the secondary equipotential grounding net by adopting a copper strip (cable) of 2 mm; the secondary equipotential grounding grid in the cabin is connected with a main grounding grid outside the cabin at one point by more than 4 copper strips (cables) with the sectional area not less than 50mm 2; obvious secondary grounding marks are required to be arranged at the connecting points;
secondly, a grounding trunk line is hidden in each prefabricated cabin, a temporary grounding terminal is arranged at a position 300mm away from the movable floor in each prefabricated cabin, and 2 temporary grounding terminals are arranged in the I-type prefabricated cabin; 3 temporary grounding terminals are preferably arranged in the type II and type III prefabricated cabins, and obvious primary grounding marks are arranged at the connecting points;
thirdly, lightning protection and overvoltage protection circuits are required to be arranged on equipment interfaces in the cabin, and lightning protection of a power supply is required to meet the requirements of lightning protection and overvoltage protection;
fourthly, the air conditioning system in the cabin should be protected against overvoltage. Under the condition that the air conditioner is installed in a metal shell wall surface installation mode, the shell of the air conditioner is reliably connected with the grounding grid.
The prefabricated cabin body needs to be grounded at two points, and the cabin door is reliably grounded by using a soft copper wire.
The cable groove box is adopted as a cable channel for the secondary cable, and the joint of the cable groove box and the preformed hole of the prefabricated cabin is directly welded, so that the secondary cable is standard in corrosion resistance and firm in installation.
The bottom of the tray and the cabinet is sealed by a fireproof plate with the thickness not less than lOmm, the partition plate is installed smoothly and firmly, organic blocking materials are densely embedded in the holes, the thickness of the line feet is not less than lOmm, the width is not less than 20mm, the width of the organic blocking materials around the cable is not less than 40mm, the organic blocking materials are geometric figures, and the surface layer is smooth.
In the prefabricated cabin inner screen cabinet installation step, secondary equipment adopts the structural forms of front wiring, front display and front maintenance, a front panel of the device adopts an upward translation or right-axis rotation opening mode, and the same opening mode is adopted in the same project; the depth of the front wiring front display device body is less than 350mm, the distance between the device body and a front panel of the device is 130mm, and the width of the front panel of the device is 447 mm; when the device is arranged in the screen and the cabinet, the device is arranged between the screen and the cabinet body, and the distance between the front panel of the device and the door surface of the cabinet is 85 mm; when the device is arranged in the frame, the device is arranged to the left.
The invention has the following positive beneficial effects:
1. the invention improves the whole construction quality, shortens the construction period and lays a foundation for subsequent construction by perfecting various preparations before construction.
2. The invention explains various hoisting conditions and correct hoisting modes in detail, and adopts the construction method to hoist the prefabricated cabin, thereby avoiding the situation that the shell of the box body is damaged due to collision with a steel structure because the box body swings in the front and back and left and right directions too much after the prefabricated cabin is suspended in the air, and enabling the prefabricated cabin to fall rapidly and stably; the stability of the whole construction is ensured.
3. According to the invention, the anticorrosion level of the cabin body is improved through the anticorrosion construction of the prefabricated cabin; the prefabricated cabin body adopts a double-layer sandwich structure, so that the overall heat insulation effect is improved; and the grounding body of the prefabricated cabin body is reliably connected, and the process is attractive.
4. The prefabricated cabin body chassis is formed by welding profile steels, and the cabin body framework is of a welding and assembling integrated structure, so that the cabin body is good in shock resistance and wear resistance when being lifted, transported and installed, and the deformation of the cabin body is avoided.
Description of the drawings:
FIG. 1 is a construction flow chart of the present invention.
The specific implementation mode is as follows:
the invention will be further explained and explained with reference to the drawings, in which:
referring to fig. 1, the installation and construction method of the prefabricated cabin of the transformer substation is characterized in that: the method comprises the following steps:
2) preparation for construction
A. Preparing a tool for hoisting, and checking whether the prefabricated cabin is damaged or not;
B. clearing up the on-site obstacles, and well taking safety measures of preventing the crane from inclining, collapsing and the like before hoisting
C. After the prefabricated cabin is in place, bending to form a grounding lead model, blanking according to the size of the model, reserving redundancy during blanking, and adopting mechanical cold bending to avoid hot bending from damaging a cast layer in the flat steel bending process; the manufactured grounding lead is connected and fastened with a grounding piece specially arranged in the prefabricated cabin through a bolt;
D. organizing drainage construction, wherein an air conditioner condensate pipe is a UPVC pipe, the installation gradient must meet the design requirement, the cold pipe is as short as possible, and the generation of air seal is avoided; when the condensate pipe is long, a suspension mode can be adopted, the distance between the brackets is l-l.2m, the drainage gradient is ensured, condensate water drainage holes are arranged in the foundation of the air conditioner external hanging machine, an organized drainage design is added, and a main pipe of the air conditioner condensate pipe is communicated with a nearby drainage well;
E. when the cable of the prefabricated cabin is laid, the cable is not exposed, the cable groove box or the cable pipe is well grounded, and anti-sinking measures are taken; the alternating current single-core cable cannot be independently penetrated into the copper pipe;
F. the fireproof plugging construction of the cable hole is carried out according to the size of the reserved hole of the cabin body, when the bottom of the prefabricated cabin is plugged, the plugging is tight and reliable, no obvious cracks or visible pores exist, and meanwhile, reliable waterproof measures are taken;
2) the method comprises the following specific operation steps:
A. hoisting the prefabricated cabin: a hoisting mode is adopted, and a hoisting piece at the bottom of the cabin is taken as a hoisting point, so that the two ends of the box body are balanced and cannot be inclined during hoisting;
firstly, lifting the II-type cabin by four points, wherein two points are arranged on each side, and the lifting points are arranged at the lower ends of two sides of the prefabricated cabin; the III-type cabin is hoisted by eight points, four points are arranged on each side, each side is distributed in a cross shape, and the bottoms of the hoisting points are arranged; the hanging points are all pull-type movable hanging points;
secondly, a 25-ton truck crane is adopted, 4 special slings with equal length are used for reliably connecting a crane hook with the prefabricated cabin lifting lug, then the crane slowly lifts the hook, the hook must be in a vertical position for hoisting, and inclined hoisting or inclined pulling is not required; when the prefabricated cabin starts to receive the pulling force of the crane, the prefabricated cabin stays for a moment, and when the steel wire rope is straightened and does not shake, the suspension arm is finely adjusted, so that the case body is ensured to swing in the front-back and left-right directions in an overlarge way after the prefabricated cabin is suspended in the air, and the case body is damaged by collision with a steel structure;
after fine adjustment is finished, the lifting hook is continuously lifted, when the distance between the bottom of the lifting box transformer substation and a steel structure supporting point is about 30cm, the lifting hook is stopped to be lifted for no less than 30 seconds, the safety of the sling rope is checked, whether each stress point is proper or not and whether stress is uniform or not are checked, and continuous lifting can be carried out under the condition that all parts have no problems;
fourthly, the prefabricated cabin is hung to the position, higher than the steel structure top section steel by more than 0.5m, of the bottom of the prefabricated cabin, the hung box is checked to have no forward, backward, leftward and rightward shaking condition, the hung box can move horizontally, when the prefabricated cabin moves to the position above the prefabricated cabin reinforced concrete foundation, the lifting hook is slowly adjusted downwards until the distance between the prefabricated cabin and the steel structure is about 0.5m, the lifting hook stops being adjusted downwards to reasonably adjust the placement direction of the box transformer, then the box transformer is slowly adjusted downwards, and the four corners of the prefabricated cabin are all provided with one person to adjust the angle and the position constantly, so that the base position of the prefabricated cabin is ensured to be aligned with the drawn cross;
fifthly, when the position of the base is not aligned with the position of the cross symbol, the prefabricated cabin is lifted again to a proper height, then the suspension arm is adjusted downwards, the angle position is adjusted until the box transformer substation is completely put down until the position of the prefabricated cabin is aligned with the position of the cross symbol;
after the prefabricated cabin is completely put down, whether the box transformer substation base is stable or not is measured, whether the prefabricated cabin is horizontal or not is measured, and if the prefabricated cabin is not stable, a steel plate needs to be added under the prefabricated cabin base until the prefabricated cabin is horizontally stable; after the prefabricated cabin is checked to be stable and the horizontal measurement meets the requirement, the hanging strip can be detached, and the crane can move back to the field in sequence;
B. and (3) mounting of the prefabricated cabin body:
thirdly, welding the bottom frame of the cabin body of the prefabricated cabin by section steel, wherein the cabin body framework is of a welding and assembling integrated structure and is processed by high-quality carbon structural steel, and the yield strength is not less than 235 MPa; the main structure of the prefabricated cabin framework adopts a high-quality steel plate, and the thickness of the steel plate is not less than 2 mm; the prefabricated cabin is required to be provided with a base for bearing equipment and is formed by welding profile steel, and the main framework structure and the base are welded into a whole; the use of the color steel plate assembled cabin body is not allowed;
fourthly, corrosion prevention of the prefabricated cabin: before carrying out anticorrosion operation, enough roughness of the surface of the steel plate is ensured, the thickness of a zinc layer is not less than 60 mu m, and the total thickness of an intermediate layer, a surface layer and the like is not less than 200 mu m;
thirdly, heat preservation of the prefabricated cabin: a double-layer sandwich structure is adopted, polyurethane fireproof heat-insulating materials are adopted as internal fillers, the heat-insulating and fireproof performance of the whole prefabricated cabin is ensured, and an environment-friendly fireproof decoration layer is added; the thickness of the door plate is not less than 45mm, so that the 24-wall heat preservation effect is ensured; an automatic temperature control system is arranged in the cabin body, an industrial heating device is additionally arranged, and a civil electric heater or a fan heater is not adopted, so that the stability of the operating environment in the cabin body is ensured;
fourthly, ventilation of the prefabricated cabin: when forced ventilation is adopted, the fan needs to adopt an imported, long-service-life and maintenance-free axial flow fan; the number of the fans should meet the requirements of air exhaust and dehumidification, multiple dustproof treatments should be carried out on the air exhaust, and the dustproof net should be convenient to disassemble, assemble and clean; structures such as an air valve and the like are required to be arranged at the air exhaust position, so that the integral protection level of the cabin body is ensured; when SF6 electrical equipment is arranged in the box body, an SF6 monitoring and automatic exhaust system is arranged to control the start and stop of an electric air inlet valve and a forced exhaust axial flow fan of the box body, the total ventilation quantity of the electric air inlet valve and the axial flow fan needs to ensure that air in the cabin body is ventilated once every 5 minutes, and the air inlet valve and the axial flow fan need to be provided with good dust removal and filtration devices to ensure that the box body is dustproof;
fifth, construction of cable channel: the laying of the primary and secondary cables in the prefabricated cabin needs special cable channels which are independent and closed; the size of the primary cable channel is designed to meet the requirements of cable laying and reasonable bending radius, and the primary cable channel is reasonably distributed in the prefabricated cabin; the secondary cable channel adopts a metal wire groove;
sixthly, measures for emergency escape of the prefabricated cabin are as follows:
a push-bar type emergency escape door lock is required to be arranged on the prefabricated cabin passage door plate to meet the emergency escape requirement of personnel; the door lock needs to meet the fireproof requirement, and has high reliability and long service life; an emergency escape passage is provided with a striking safety exit indication, and related passage indication equipment needs to consider an emergency power supply so as to ensure the reliable indication of the emergency power supply;
and illumination construction of the cabin body:
a channel illuminating lamp is arranged in the prefabricated cabin overhaul corridor, an LED lamp is adopted as the illuminating lamp, sufficient illumination is ensured, and overhaul and test of the interior of the box body are facilitated; accident illumination is respectively arranged at two ends of a prefabricated cabin overhaul corridor and can be automatically started under the condition of power failure of a total station, so that the accident illumination in the overhaul corridor is ensured;
eighthly, grounding construction of the cabin body:
a special grounding conductor is arranged on a bottom frame of a box body of the prefabricated cabin, a fixed grounding terminal connected with a grounding network is arranged on the grounding conductor, is connected with equipment in the prefabricated cabin in a grounding and protection grounding mode, and has an obvious grounding mark; the grounding terminal is a copper bolt with the diameter not less than 12 mm; the metal framework of the prefabricated cabin, the metal supports of the high power distribution device, the low power distribution device and the transformer room are provided with grounding terminals meeting technical conditions, and the grounding terminals are reliably connected with the special grounding conductor; at least 4 obvious grounding points are arranged outside the underframe of each box body of the prefabricated cabin, the grounding points are welded with a reliable underframe by adopting copper plates and are provided with copper bolts with the diameter not less than 12mm, so that the box bodies are conveniently connected with a basic grounding network on site;
D. and (3) installing and constructing a screen cabinet in the prefabricated cabin:
1) the appearance form and the color of the cabinet in the cabin are uniform, and the identification positions, fonts and heights of the cabinet name, the manufacturer name and the like are consistent; the secondary equipment installation adopts a screen, cabinet mode or a rack type structure, the secondary equipment cabinets in the cabin are arranged by double rows of adjacent walls, and the centralized interface cabinets are arranged at two ends of the equipment cabinet on the long side;
2) when the equipment in the cabin adopts a screen and cabinet installation mode:
firstly, the screen and the cabinet adopt a vertical self-standing cabinet type structure with an embedded cabinet door, the front door is a glass door, the front view screen and the cabinet body are arranged on the right side, and the door handle is arranged on the left side;
secondly, the terminal rows are uniformly arranged at the lower part of the cabinet body and adopt a transverse terminal row arrangement mode; the distance between the terminal row and the front door of the cabinet is not more than 75mm, the distance between the terminal row and the side plate of the cabinet is not more than 150mm, and the distance between the terminal row and the ground is not more than 250 mm; the distance between the two rows of terminal rows is not smaller than 100 mm; redundant tail cable reel collecting spaces are required to be arranged in the screen and the cabinet, and the width of the vertical wire slot is not less than 70 mm;
reserving 1-4 spare cabinet positions for each prefabricated cabin, installing an empty cabinet in a long-term cabinet in the prefabricated cabin at the current stage, reserving related wiring, arranging a permanent spare screen position at a position close to the cabin door, and laying a cover plate;
3) when the cabin is installed by adopting a rack-type structure:
firstly, a basic frame is formed by paired vertical components of a frame configured according to a preset distance, a main body and a prefabricated cabin body are integrally designed, manufactured and installed, internal components can be integrally installed along with the prefabricated cabin body, and the mode of manufacturing outside the cabin and modular installation can also be adopted;
secondly, the devices in the rack are arranged in the middle or in an offset mode, when the devices are arranged in the middle, wiring grooves are arranged on two sides of the devices, optical cables are divided into wiring lines according to the left optical principle and the right optical principle, and terminals in the rack are transversely arranged; when the device is arranged in an offset way, the device is preferably arranged on the left side of the frame, and the inner terminal of the frame is longitudinally arranged on the right side of the frame; the bottom of the whole row of racks is provided with a coherent and open wiring channel, the channel is arranged on the plane of the anti-static floor, and the front surface of the channel is shielded by a quick-release panel;
arranging an air duct in the cabin, directly guiding air outlet of the air conditioner to the inside of the rack, arranging ventilation openings at the top and below each row of racks to form vertical convection air, avoiding local overheating in the rack, and staggering the position of an air outlet with equipment in the rack;
4) and the construction of the electrical and auxiliary facilities of the prefabricated cabin:
firstly, complete safety protection and video monitoring measures are set in the prefabricated cabin, and meanwhile, facilities such as illumination, maintenance, grounding and the like are set, so that the requirements of safe operation of prefabricated cabin equipment and inspection of personnel are met;
secondly, the prefabricated cabin interior lighting system consists of normal lighting and emergency lighting, and the emergency lighting comprises accident lighting and evacuation lighting; the emergency lighting lamp is taken into consideration by partial normal lighting lamps, an AC/DC dual-purpose LED lighting lamp is adopted, a power supply is suitable for being LED from a DC split screen, and an in-station inverter power supply, a UPS power supply or a self-contained storage battery (not less than 120 min) can be adopted for supplying power; when the normal lighting system cannot work, switching to emergency lighting power supply; the evacuation lighting part is provided with a storage battery, the emergency time is not less than 120min, and an evacuation indicating sign with the storage battery is arranged at an outlet;
thirdly, portable fire extinguishers are required to be arranged in the cabin, and the grade and the number of the fire extinguishers are required to be arranged according to the fire hazard class as the medium hazard class; under the condition of ensuring safety and reliability, a fixed gas fire extinguishing system can be arranged;
fourthly, two industrial air-conditioning integrated machines (a main machine and a spare machine) with dehumidification and fault alarm output functions are arranged in the cabin and are installed in a wall-mounted mode; under the extremely low temperature environment, heating equipment or air conditioner heating power should be increased; under the extremely high temperature environment, the refrigeration power of the air conditioner is increased; the ventilation equipment capacity of changing air should meet the requirement of changing air 6 times per hour, and the air duct of the fan should have dustproof and waterproof measures; a filtering device is arranged at an air duct inlet of a fan in a high wind and sand area;
installing video monitoring in the cabin, and arranging 1-2 rotary cameras to effectively monitor the conditions of the prefabricated cabin entrance and exit and the cabin channel; a wired telephone is arranged in the cabin and is installed in a wall-hanging manner; in the cabin; a movable or fixed folding table is arranged; at least one door with an emergency escape function is arranged in the cabin; an intelligent environment control unit is arranged in the cabin to realize the functions of monitoring, controlling and alarming the environment in the cabin;
5) and laying cables in the prefabricated cabin and constructing an interface:
firstly, 1-2 cable channel inlets and outlets communicated with an in-station cable channel are arranged in a cabin, and the connection between secondary equipment in the cabin and optical fibers outside the cabin and the connection between the secondary equipment in the cabin and cables outside the cabin are not in a prefabricated form;
secondly, a tail cable is adopted for optical fiber connection among the cabinets in the cabin, and jump fibers are adopted for the optical fiber connection in the cabinets; wiring among cabinets in the cabin is realized in a mode of wiring in an interlayer of a base of the cabin body, communication cables and cables in the interlayer are laid in a separated mode, the communication cables are preferably provided with wiring groove boxes, and reliable cover plates are arranged at the tops of the groove boxes;
thirdly, when the equipment in the cabin adopts a screen and cabinet installation mode, cables between the screen and the cabinet are wired through wiring grooves in the cabin and then led to the equipment in the screen and the cabinet or terminal rows from wire inlet holes at the bottom of the screen and the cabinet; optical cable wiring in the screen and the cabinet is suitable to be arranged on the left and the right, and a wiring way of a wiring groove is adopted;
fourthly, when the equipment in the cabin is installed in a rack type structure mode, an optical cable routing channel is arranged between the two rows of racks and below the anti-static floor; cables between racks in the same row are distributed through the cable distribution channel with the bottom opened at the bottom of the rack, and the cables are downwards led to the cable distribution channel at the bottom from the right side and then led to the target rack internal device and the terminal block through the channel;
fifthly, redundant tail cables and jumping fibers in the cabinet are stored and fixed by a special fiber storage box, so that bending and breaking of the optical fibers are avoided; leading-out wires and jump fibers of the tail cables are not tightly bound by a binding belt;
a distribution box, a switch panel, a socket and the like are arranged in the cabin, the height from the bottom of the distribution box to the ground is 1.3m, the switch panel is installed in an embedded mode, the distance from the bottom of the panel to the ground is 1.3m, the distance from the side edge to a door frame is 0.2m, the distance between the panels is not less than 0.02m, and the distance from the bottom edge of the socket to the ground is 0.5 m;
sixthly, cables of equipment such as air conditioners, lighting, security protection, fire protection, environment monitoring and the like in the cabin are in a hidden laying mode, and wires of the prefabricated cabin body are arranged in a hidden row mode through the side wall and the cabin top; the wiring on the cabin top needs to pass through wiring grooves or wiring pipes, and the wiring on the side face of the cabin body needs to be protected through PVC pipes; each air conditioner, lighting, working socket and ventilation are respectively provided with a circuit breaker, and all the circuit breakers are concentrated in a distribution box and have personal safety protection measures and misoperation protection measures; all in-cabin ancillary equipment should have obvious marks;
6) and grounding and anti-interference construction:
firstly, a shielding measure is adopted for a prefabricated cabin, a special copper bar of 2mm is laid on the lower layer of an electrostatic floor of the prefabricated cabin according to the arrangement direction of a cabinet, the head end and the tail end of the special copper bar are connected to form a secondary equipotential grounding net in the prefabricated cabin, the secondary equipotential grounding net is insulated from the cabin body, and the grounding copper bar in the cabinet is connected with the secondary equipotential grounding net by adopting a copper strip (cable) of 2 mm; the secondary equipotential grounding grid in the cabin is connected with a main grounding grid outside the cabin at one point by more than 4 copper strips (cables) with the sectional area not less than 50mm 2; obvious secondary grounding marks are required to be arranged at the connecting points;
secondly, a grounding trunk line is hidden in each prefabricated cabin, a temporary grounding terminal is arranged at a position 300mm away from the movable floor in each prefabricated cabin, and 2 temporary grounding terminals are arranged in the I-type prefabricated cabin; 3 temporary grounding terminals are preferably arranged in the type II and type III prefabricated cabins, and obvious primary grounding marks are arranged at the connecting points;
thirdly, lightning protection and overvoltage protection circuits are required to be arranged on equipment interfaces in the cabin, and lightning protection of a power supply is required to meet the requirements of lightning protection and overvoltage protection;
fourthly, the air conditioning system in the cabin should be protected against overvoltage. Under the condition that the air conditioner is installed in a metal shell wall surface installation mode, the shell of the air conditioner is reliably connected with the grounding grid.
Two points of the prefabricated cabin body are required to be grounded, and the cabin door is reliably grounded by using a soft copper wire.
The cable groove box is adopted as a cable channel for the secondary cable, and the joint of the cable groove box and the preformed hole of the prefabricated cabin is directly welded, so that the secondary cable is standard in corrosion resistance and firm in installation.
The bottom of the tray and the cabinet is sealed by a fireproof plate with the thickness not less than lOmm, the partition plate is installed smoothly and firmly, organic blocking materials are densely embedded in the holes, the thickness of the line legs is not less than lOmm, the width is not less than 20mm, the width of the organic blocking materials around the cable is not less than 40mm, the organic blocking materials are geometric figures, and the surface layer is smooth.
In the installation step of the screen cabinet in the prefabricated cabin, secondary equipment adopts the structural forms of front wiring, front display and front maintenance, a front panel of the device adopts an upward translation or right-axis rotation opening mode, and the same opening mode is adopted in the same project; the depth of the front wiring front display device body is less than 350mm, the distance between the device body and a front panel of the device is 130mm, and the width of the front panel of the device is 447 mm; when the device is arranged in the screen and the cabinet, the device is arranged between the screen and the cabinet body, and the distance between the front panel of the device and the door surface of the cabinet is 85 mm; when the device is arranged in the frame, the device is arranged to the left.
In the above description, the prefabricated cabin is constructed in strength: a) top load: the minimum value is 2500N per square meter (the tree stand load or other loads); the top load of the steel structure is: 0.85KN per square meter; b) external mechanical impacts on panels, doors and vents: the impact energy of the external mechanical impact is 20J, and the corresponding protection grade is IK10 of GB/T20138.
The prefabricated cabin wall plate is required to ensure enough mechanical strength of the cabin body, when a three-dimensional structure is adopted, the skeleton main body structure is lined with profile steel, a sufficient supporting structure is designed according to bearing calculation, and a corresponding finite element model structural strength analysis report is provided.
The invention provides a set of perfect operation flow and operation procedures, improves the construction quality, shortens the construction period and avoids the condition of collision damage when the prefabricated cabin is hoisted; the stability of the whole construction is improved, and the method is easy to popularize.
Claims (5)
1. The installation and construction method of the prefabricated cabin of the 110 KV transformer substation is characterized by comprising the following steps of: the method comprises the following steps:
preparation for construction
A. Preparing a tool for hoisting, and checking whether the prefabricated cabin is damaged or not;
B. clearing up the on-site obstacles, and well taking safety measures such as crane inclination prevention, collapse prevention and the like before hoisting;
C. after the prefabricated cabin is in place, bending to form a grounding lead model, blanking according to the size of the model, reserving redundancy during blanking, and adopting mechanical cold bending to avoid hot bending from damaging a cast layer in the flat steel bending process; the manufactured grounding lead is connected and fastened with a grounding piece specially arranged in the prefabricated cabin through a bolt;
D. organizing drainage construction, wherein an air conditioner condensate pipe is a UPVC pipe, and a cold water pipe is required to avoid air seal; when the condensate pipe is long, a suspension mode can be adopted, the distance between the brackets is l-l.2m, the drainage gradient is ensured, condensate water drainage holes are arranged in the foundation of the air conditioner external hanging machine, an organized drainage design is added, and a main pipe of the air conditioner condensate pipe is communicated with a nearby drainage well;
E. when the cable of the prefabricated cabin is laid, the cable is not exposed, the cable groove box or the cable pipe is well grounded, and anti-sinking measures are taken; the alternating current single-core cable cannot be independently penetrated into the copper pipe;
F. the fireproof plugging construction of the cable hole is carried out according to the size of the reserved hole of the cabin body, when the bottom of the prefabricated cabin is plugged, the plugging is tight and reliable, no obvious cracks or visible pores exist, and meanwhile, reliable waterproof measures are taken;
2) the method comprises the following specific operation steps:
A. hoisting the prefabricated cabin: a hoisting mode is adopted, and a hoisting piece at the bottom of the cabin is taken as a hoisting point, so that the two ends of the box body are balanced and cannot be inclined during hoisting;
firstly, lifting the II-type cabin by four points, wherein two points are arranged on each side, and the lifting points are arranged at the lower ends of two sides of the prefabricated cabin; the III-type cabin is hoisted by eight points, four points are arranged on each side, each side is distributed in a cross shape, and the bottoms of the hoisting points are arranged; the hanging points are all pull-type movable hanging points;
secondly, a 25-ton truck crane is adopted, 4 special slings with equal length are used for reliably connecting a crane hook with the prefabricated cabin lifting lug, then the crane slowly lifts the hook, the hook must be in a vertical position for hoisting, and inclined hoisting or inclined pulling is not required; when the prefabricated cabin starts to receive the pulling force of the crane, the prefabricated cabin stays for a moment, and when the steel wire rope is straightened and does not shake, the suspension arm is finely adjusted, so that the case body is ensured to swing in the front-back and left-right directions in an overlarge way after the prefabricated cabin is suspended in the air, and the case body is damaged by collision with a steel structure;
after fine adjustment is finished, the lifting hook is continuously lifted, when the distance between the bottom of the lifting box transformer substation and a steel structure supporting point is about 30cm, the lifting hook is stopped to be lifted for no less than 30 seconds, the safety of the sling rope is checked, whether each stress point is proper or not and whether stress is uniform or not are checked, and continuous lifting can be carried out under the condition that all parts have no problems;
fourthly, the prefabricated cabin is hung to the position, higher than the steel structure top section steel by more than 0.5m, of the bottom of the prefabricated cabin, the hung box is checked to have no forward, backward, leftward and rightward shaking condition, the hung box can move horizontally, when the prefabricated cabin moves to the position above the prefabricated cabin reinforced concrete foundation, the lifting hook is slowly adjusted downwards until the distance between the prefabricated cabin and the steel structure is about 0.5m, the lifting hook stops being adjusted downwards to reasonably adjust the placement direction of the box transformer, then the box transformer is slowly adjusted downwards, and the four corners of the prefabricated cabin are all provided with one person to adjust the angle and the position constantly, so that the base position of the prefabricated cabin is ensured to be aligned with the drawn cross;
fifthly, when the position of the base is not aligned with the position of the cross symbol, the prefabricated cabin is lifted again to a proper height, then the suspension arm is adjusted downwards, the angle position is adjusted until the box transformer substation is completely put down until the position of the prefabricated cabin is aligned with the position of the cross symbol;
after the prefabricated cabin is completely put down, whether the box transformer substation base is stable or not is measured, whether the prefabricated cabin is horizontal or not is measured, and if the prefabricated cabin is not stable, a steel plate needs to be added under the prefabricated cabin base until the prefabricated cabin is horizontally stable; after the prefabricated cabin is checked to be stable and the horizontal measurement meets the requirement, the hanging strip can be detached, and the crane can move back to the field in sequence;
B. and (3) mounting of the prefabricated cabin body:
the prefabricated cabin body chassis is formed by welding profile steels, the cabin body framework is of a welding and assembling integrated structure and is processed by adopting high-quality carbon structural steel, and the yield strength is not less than 235 MPa; the main structure of the prefabricated cabin framework adopts a high-quality steel plate, and the thickness of the steel plate is not less than 2 mm; the prefabricated cabin is required to be provided with a base for bearing equipment and is formed by welding profile steel, and the main framework structure and the base are welded into a whole; the use of the color steel plate assembled cabin body is not allowed;
and (3) anticorrosive construction of the prefabricated cabin: before carrying out anticorrosion operation, enough roughness of the surface of the steel plate is ensured, the thickness of a zinc layer is not less than 60 mu m, and the total thickness of an intermediate layer, a surface layer and the like is not less than 200 mu m;
thirdly, heat preservation construction of the prefabricated cabin: a double-layer sandwich structure is adopted, polyurethane fireproof heat-insulating materials are adopted as internal fillers, the heat-insulating and fireproof performance of the whole prefabricated cabin is ensured, and an environment-friendly fireproof decoration layer is added; the thickness of the door plate is not less than 45mm, so that the 24-wall heat preservation effect is ensured; an automatic temperature control system is arranged in the cabin body, an industrial heating device is additionally arranged, and a civil electric heater or a fan heater is not adopted, so that the stability of the operating environment in the cabin body is ensured;
fourthly, ventilation construction of the prefabricated cabin: when forced ventilation is adopted, the fan needs to adopt an imported, long-service-life and maintenance-free axial flow fan; the number of the fans should meet the requirements of air exhaust and dehumidification, multiple dustproof treatments should be carried out on the air exhaust, and the dustproof net should be convenient to disassemble, assemble and clean; structures such as an air valve and the like are required to be arranged at the air exhaust position, so that the integral protection level of the cabin body is ensured; when SF6 electrical equipment is arranged in the box body, an SF6 monitoring and automatic exhaust system is arranged to control the start and stop of an electric air inlet valve and a forced exhaust axial flow fan of the box body, the total ventilation quantity of the electric air inlet valve and the axial flow fan needs to ensure that air in the cabin body is ventilated once every 5 minutes, and the air inlet valve and the axial flow fan need to be provided with good dust removal and filtration devices to ensure that the box body is dustproof;
fifth, construction of cable channel: the laying of the primary and secondary cables in the prefabricated cabin needs special cable channels which are independent and closed; the size of the primary cable channel is designed to meet the requirements of cable laying and reasonable bending radius, and the primary cable channel is reasonably distributed in the prefabricated cabin; the secondary cable channel adopts a metal wire groove;
sixthly, measures for emergency escape of the prefabricated cabin are as follows:
a push-bar type emergency escape door lock is required to be arranged on the prefabricated cabin passage door plate to meet the emergency escape requirement of personnel; the door lock needs to meet the fireproof requirement, and has high reliability and long service life; an emergency escape passage is provided with a striking safety exit indication, and related passage indication equipment needs to consider an emergency power supply so as to ensure the reliable indication of the emergency power supply;
and illumination construction of the cabin body:
a channel illuminating lamp is arranged in the prefabricated cabin overhaul corridor, an LED lamp is adopted as the illuminating lamp, sufficient illumination is ensured, and overhaul and test of the interior of the box body are facilitated; accident illumination is respectively arranged at two ends of a prefabricated cabin overhaul corridor and can be automatically started under the condition of power failure of a total station, so that the accident illumination in the overhaul corridor is ensured;
eighthly, grounding construction of the cabin body:
a special grounding conductor is arranged on a bottom frame of a box body of the prefabricated cabin, a fixed grounding terminal connected with a grounding network is arranged on the grounding conductor, is connected with equipment in the prefabricated cabin in a grounding and protection grounding mode, and has an obvious grounding mark; the grounding terminal is a copper bolt with the diameter not less than 12 mm; the metal framework of the prefabricated cabin, the metal supports of the high power distribution device, the low power distribution device and the transformer room are provided with grounding terminals meeting technical conditions, and the grounding terminals are reliably connected with the special grounding conductor; at least 4 obvious grounding points are arranged outside the underframe of each box body of the prefabricated cabin, the grounding points are welded with a reliable underframe by adopting copper plates and are provided with copper bolts with the diameter not less than 12mm, so that the box bodies are conveniently connected with a basic grounding network on site;
and (3) installing and constructing a screen cabinet in the prefabricated cabin:
1) the appearance form and the color of the cabinet in the cabin are uniform, and the identification positions, fonts and heights of the cabinet name, the manufacturer name and the like are consistent; the secondary equipment installation adopts a screen, cabinet mode or a rack type structure, the secondary equipment cabinets in the cabin are arranged by double rows of adjacent walls, and the centralized interface cabinets are arranged at two ends of the equipment cabinet on the long side;
2) when the equipment in the cabin adopts a screen and cabinet installation mode:
firstly, the screen and the cabinet adopt a vertical self-standing cabinet type structure with an embedded cabinet door, the front door is a glass door, the front view screen and the cabinet body are arranged on the right side, and the door handle is arranged on the left side;
secondly, the terminal rows are uniformly arranged at the lower part of the cabinet body and adopt a transverse terminal row arrangement mode; the distance between the terminal row and the front door of the cabinet is not more than 75mm, the distance between the terminal row and the side plate of the cabinet is not more than 150mm, and the distance between the terminal row and the ground is not more than 250 mm; the distance between the two rows of terminal rows is not smaller than 100 mm; redundant tail cable reel collecting spaces are required to be arranged in the screen and the cabinet, and the width of the vertical wire slot is not less than 70 mm;
reserving 1-4 spare cabinet positions for each prefabricated cabin, installing an empty cabinet in a long-term cabinet in the prefabricated cabin at the current stage, reserving related wiring, arranging a permanent spare screen position at a position close to the cabin door, and laying a cover plate;
3) when the cabin is installed by adopting a rack-type structure:
firstly, a basic frame is formed by paired vertical components of a frame configured according to a preset distance, a main body and a prefabricated cabin body are integrally designed, manufactured and installed, internal components can be integrally installed along with the prefabricated cabin body, and the mode of manufacturing outside the cabin and modular installation can also be adopted;
secondly, the devices in the rack are arranged in the middle or in an offset mode, when the devices are arranged in the middle, wiring grooves are arranged on two sides of the devices, optical cables are divided into wiring lines according to the left optical principle and the right optical principle, and terminals in the rack are transversely arranged; when the device is arranged in an offset way, the device is preferably arranged on the left side of the frame, and the inner terminal of the frame is longitudinally arranged on the right side of the frame; the bottom of the whole row of racks is provided with a coherent and open wiring channel, the channel is arranged on the plane of the anti-static floor, and the front surface of the channel is shielded by a quick-release panel;
arranging an air duct in the cabin, directly guiding air outlet of the air conditioner to the inside of the rack, arranging ventilation openings at the top and below each row of racks to form vertical convection air, avoiding local overheating in the rack, and staggering the position of an air outlet with equipment in the rack;
4) and the construction of the electrical and auxiliary facilities of the prefabricated cabin:
firstly, complete safety protection and video monitoring measures are set in the prefabricated cabin, and meanwhile, facilities such as illumination, maintenance, grounding and the like are set, so that the requirements of safe operation of prefabricated cabin equipment and inspection of personnel are met;
secondly, the prefabricated cabin interior lighting system consists of normal lighting and emergency lighting, and the emergency lighting comprises accident lighting and evacuation lighting; the emergency lighting lamp is taken into consideration by partial normal lighting lamps, an AC/DC dual-purpose LED lighting lamp is adopted, a power supply is suitable for being LED from a DC split screen, and an in-station inverter power supply, a UPS power supply or a self-contained storage battery (not less than 120 min) can be adopted for supplying power; when the normal lighting system cannot work, switching to emergency lighting power supply; the evacuation lighting part is provided with a storage battery, the emergency time is not less than 120min, and an evacuation indicating sign with the storage battery is arranged at an outlet;
thirdly, portable fire extinguishers are required to be arranged in the cabin, and the grade and the number of the fire extinguishers are required to be arranged according to the fire hazard class as the medium hazard class; under the condition of ensuring safety and reliability, a fixed gas fire extinguishing system can be arranged;
fourthly, two industrial air-conditioning integrated machines with dehumidification and fault alarm output functions are arranged in the cabin and are installed in a wall-mounted mode; under the extremely low temperature environment, heating equipment or air conditioner heating power should be increased; under the extremely high temperature environment, the refrigeration power of the air conditioner is increased; the ventilation equipment capacity of changing air should meet the requirement of changing air 6 times per hour, and the air duct of the fan should have dustproof and waterproof measures; a filtering device is arranged at an air duct inlet of a fan in a high wind and sand area;
installing video monitoring in the cabin, and arranging 1-2 rotary cameras to effectively monitor the conditions of the prefabricated cabin entrance and exit and the cabin channel; a wired telephone is arranged in the cabin and is installed in a wall-hanging manner; in the cabin; a movable or fixed folding table is arranged; at least one door with an emergency escape function is arranged in the cabin; an intelligent environment control unit is arranged in the cabin to realize the functions of monitoring, controlling and alarming the environment in the cabin;
5) and laying cables in the prefabricated cabin and constructing an interface:
firstly, 1-2 cable channel inlets and outlets communicated with an in-station cable channel are arranged in a cabin, and the connection between secondary equipment in the cabin and optical fibers outside the cabin and the connection between the secondary equipment in the cabin and cables outside the cabin are not in a prefabricated form;
secondly, a tail cable is adopted for optical fiber connection among the cabinets in the cabin, and jump fibers are adopted for the optical fiber connection in the cabinets; wiring among cabinets in the cabin is realized in a mode of wiring in an interlayer of a base of the cabin body, communication cables and cables in the interlayer are laid in a separated mode, the communication cables are preferably provided with wiring groove boxes, and reliable cover plates are arranged at the tops of the groove boxes;
thirdly, when the equipment in the cabin adopts a screen and cabinet installation mode, cables between the screen and the cabinet are wired through wiring grooves in the cabin and then led to the equipment in the screen and the cabinet or terminal rows from wire inlet holes at the bottom of the screen and the cabinet; optical cable wiring in the screen and the cabinet is suitable to be arranged on the left and the right, and a wiring way of a wiring groove is adopted;
fourthly, when the equipment in the cabin is installed in a rack type structure mode, an optical cable routing channel is arranged between the two rows of racks and below the anti-static floor; cables between racks in the same row are distributed through the cable distribution channel with the bottom opened at the bottom of the rack, and the cables are downwards led to the cable distribution channel at the bottom from the right side and then led to the target rack internal device and the terminal block through the channel;
fifthly, redundant tail cables and jumping fibers in the cabinet are stored and fixed by a special fiber storage box, so that bending and breaking of the optical fibers are avoided; leading-out wires and jump fibers of the tail cables are not tightly bound by a binding belt;
a distribution box, a switch panel, a socket and the like are arranged in the cabin, the height from the bottom of the distribution box to the ground is 1.3m, the switch panel is installed in an embedded mode, the distance from the bottom of the panel to the ground is 1.3m, the distance from the side edge to a door frame is 0.2m, the distance between the panels is not less than 0.02m, and the distance from the bottom edge of the socket to the ground is 0.5 m;
sixthly, cables of equipment such as air conditioners, lighting, security protection, fire protection, environment monitoring and the like in the cabin are in a hidden laying mode, and wires of the prefabricated cabin body are arranged in a hidden row mode through the side wall and the cabin top; the wiring on the cabin top needs to pass through wiring grooves or wiring pipes, and the wiring on the side face of the cabin body needs to be protected through PVC pipes; each air conditioner, lighting, working socket and ventilation are respectively provided with a circuit breaker, and all the circuit breakers are concentrated in a distribution box and have personal safety protection measures and misoperation protection measures; all in-cabin ancillary equipment should have obvious marks;
6) and grounding and anti-interference construction:
firstly, a shielding measure is adopted for a prefabricated cabin, a special copper bar of 2mm is laid on the lower layer of an electrostatic floor of the prefabricated cabin according to the arrangement direction of a cabinet, the head end and the tail end of the special copper bar are connected to form a secondary equipotential grounding net in the prefabricated cabin, the secondary equipotential grounding net is insulated from the cabin body, and the grounding copper bar in the cabinet is connected with the secondary equipotential grounding net by adopting a copper strip (cable) of 2 mm; the secondary equipotential grounding grid in the cabin is connected with a main grounding grid outside the cabin at one point by more than 4 copper strips (cables) with the sectional area not less than 50mm 2; obvious secondary grounding marks are required to be arranged at the connecting points;
secondly, a grounding trunk line is hidden in each prefabricated cabin, a temporary grounding terminal is arranged at a position 300mm away from the movable floor in each prefabricated cabin, and 2 temporary grounding terminals are arranged in the I-type prefabricated cabin; 3 temporary grounding terminals are preferably arranged in the type II and type III prefabricated cabins, and obvious primary grounding marks are arranged at the connecting points;
thirdly, lightning protection and overvoltage protection circuits are required to be arranged on equipment interfaces in the cabin, and lightning protection of a power supply is required to meet the requirements of lightning protection and overvoltage protection;
fourthly, an air conditioning system in the cabin should take overvoltage protection measures;
under the condition that the air conditioner is installed in a metal shell wall surface installation mode, the shell of the air conditioner is reliably connected with the grounding grid.
2. The installation and construction method of the 110 kV substation prefabricated cabin according to claim 1, characterized in that: the prefabricated cabin body needs to be grounded at two points, and the cabin door is reliably grounded by using a soft copper wire.
3. The installation and construction method of the 110 kV substation prefabricated cabin according to claim 1, characterized in that: the cable groove box is adopted as a cable channel for the secondary cable, and the joint of the cable groove box and the preformed hole of the prefabricated cabin is directly welded, so that the secondary cable is standard in corrosion resistance and firm in installation.
4. The installation and construction method of the 110 kV substation prefabricated cabin according to claim 1, characterized in that: the bottom of the tray and the cabinet is sealed by a fireproof plate with the thickness not less than lOmm, the partition plate is installed smoothly and firmly, organic blocking materials are densely embedded in the holes, the thickness of the line feet is not less than lOmm, the width is not less than 20mm, the width of the organic blocking materials around the cable is not less than 40mm, the organic blocking materials are geometric figures, and the surface layer is smooth.
5. The installation and construction method of the 110 kV substation prefabricated cabin according to claim 1, characterized in that: in the prefabricated cabin inner screen cabinet installation step, secondary equipment adopts the structural forms of front wiring, front display and front maintenance, a front panel of the device adopts an upward translation or right-axis rotation opening mode, and the same opening mode is adopted in the same project; the depth of the front wiring front display device body is less than 350mm, the distance between the device body and a front panel of the device is 130mm, and the width of the front panel of the device is 447 mm; when the device is arranged in the screen and the cabinet, the device is arranged between the screen and the cabinet body, and the distance between the front panel of the device and the door surface of the cabinet is 85 mm; when the device is arranged in the frame, the device is arranged to the left.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011207138.0A CN112366578A (en) | 2020-11-03 | 2020-11-03 | Installation construction method for prefabricated cabin of 110 KV transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011207138.0A CN112366578A (en) | 2020-11-03 | 2020-11-03 | Installation construction method for prefabricated cabin of 110 KV transformer substation |
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| CN112366578A true CN112366578A (en) | 2021-02-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708705A (en) * | 2021-08-17 | 2021-11-26 | 乐山一拉得电网自动化有限公司 | Prefabricated cabin type intelligent high-power variable frequency drilling machine electric control system |
| CN115450439A (en) * | 2022-10-17 | 2022-12-09 | 中铁十一局集团有限公司 | Method for installing large hyperbaric oxygen chamber body of hospital |
| CN115506599A (en) * | 2021-11-30 | 2022-12-23 | 青岛特锐德电气股份有限公司 | Installation method of prefabricated cabin for transformer substation |
-
2020
- 2020-11-03 CN CN202011207138.0A patent/CN112366578A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708705A (en) * | 2021-08-17 | 2021-11-26 | 乐山一拉得电网自动化有限公司 | Prefabricated cabin type intelligent high-power variable frequency drilling machine electric control system |
| CN115506599A (en) * | 2021-11-30 | 2022-12-23 | 青岛特锐德电气股份有限公司 | Installation method of prefabricated cabin for transformer substation |
| CN115450439A (en) * | 2022-10-17 | 2022-12-09 | 中铁十一局集团有限公司 | Method for installing large hyperbaric oxygen chamber body of hospital |
| CN115450439B (en) * | 2022-10-17 | 2023-12-01 | 中铁十一局集团有限公司 | Method for installing large hyperbaric oxygen chamber body of hospital |
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