CN110971147A - Construction method of static variable frequency starting system of large phase modulator unit - Google Patents
Construction method of static variable frequency starting system of large phase modulator unit Download PDFInfo
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- CN110971147A CN110971147A CN201911243536.5A CN201911243536A CN110971147A CN 110971147 A CN110971147 A CN 110971147A CN 201911243536 A CN201911243536 A CN 201911243536A CN 110971147 A CN110971147 A CN 110971147A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/46—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor
- H02P1/52—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor by progressive increase of frequency of supply to motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Installation Of Indoor Wiring (AREA)
Abstract
The invention discloses a construction method of a static variable frequency starting system of a large phase modulator unit, which comprises the following steps: 1) preparing tools required by construction, 2) checking equipment, 3) installing basic channel steel of SFC equipment, 4) installing an SFC control panel cabinet, 5) installing an SFC system matched isolation transformer cabinet, 6) installing an SFC isolation switch cabinet, 7) laying a 6KV high-voltage cable, 8) manufacturing a 6KV high-voltage cable head, 9) controlling cable laying and wiring, and 10) cleaning a site. The invention provides a set of complete and detailed construction scheme, and the construction method is used for mounting and constructing the camera SFC, thereby not only ensuring the construction quality, but also shortening the whole construction period and being beneficial to the normal operation of a power grid.
Description
The technical field is as follows:
the invention relates to an installation and construction method of a variable frequency starting system of a phase modulator, in particular to a construction method of a static variable frequency starting system of a large phase modulator unit, belonging to the field of variable frequency starting of large synchronous units
Secondly, background art:
with the development of national power grid science and technology, the trend of stabilizing the operation of a power grid and additionally installing a phase modulator is already trend; an SFC system (NES-5900 static variable frequency starting system) is used for carrying out variable frequency starting on a camera modulator, and is suitable for the field of variable frequency starting of large synchronous units, such as large phase modulator units, large pumped storage units, large gas turbine units and the like; because the phase modulation SFC system is composed of a plurality of modules, the whole construction period is long, the construction difficulty is higher, so that a set of complete installation and construction scheme is urgently needed at present, and the modules can be assembled in sequence in a short time.
Thirdly, the invention content:
the technical problem to be solved by the invention is as follows: the construction method of the static variable frequency starting system of the large phase modulator unit can be used for rapidly assembling the phase modulator SFC system, ensures the overall construction quality, is short in construction period and easy to popularize.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a construction method of a static variable frequency starting system of a large phase modulation machine set comprises the following steps:
preparation work:
1) preparing tools required by construction;
2) and (3) checking the equipment:
①, after the SFC system equipment is transported to the site, the equipment is stored in a place which is dry, ventilated, far away from moisture and contains corrosive gas, and is unpacked for the first time to check whether collision damage phenomena occur due to transportation and other reasons, and the number of parts is checked;
②, after checking and accepting the scattered parts and standard parts, especially copper bus and cable, the parts should be transported to a special storage immediately to prevent the parts from being affected with damp, corroded, damaged and lost due to being stored in an open warehouse;
the method comprises the following operation steps:
1) installation of SFC equipment foundation channel steel
①, firstly correcting blanking of the basic channel steel, cutting according to the designed length, and when the cutting machine is used for blanking, firstly correcting the cutting machine to ensure that the cutting surface of the channel steel is straight;
②, when embedding the basic channel steel, embedding according to the design interval arrangement and the design size, when laying, firstly finding out the civil engineering elevation, after the foundation is installed, the top of the foundation is higher than the floating ground by 5-10mm according to the design;
③, connecting the foundation and the main grounding grid at least at two points, adopting lap welding, wherein the welding length is 2 times of the width of the flat steel, and welding at least two edges;
2) installation of SFC control panel cabinet
The module assembly of the SFC control panel cabinet is slowly translated to the base by adopting a rolling bar and a chain block, the bus contact surface of the SFC control panel cabinet is tightly connected, the bus contact surface is tightly connected with a corresponding angle during fastening, and a connecting bolt is fastened by using a torque wrench;
3) installation of SFC system matched isolation transformer cabinet
①, before the transformer is in place, cleaning the surface of the basic channel steel at the position, and checking whether the specification and the model of the basic channel steel meet the requirements;
②, moving the transformer to the basic channel steel, taking down the rolling bar, adjusting and aligning the rolling bar with the longitudinal and transverse center lines to enable the transformer to be in place, and welding and fixing the transformer after the adjustment is finished;
4) SFC isolation switch cabinet installation
①, before the SFC isolation switch cabinet is in place, cleaning the surface of the basic channel steel at the position, and checking whether the specification and the model of the basic channel steel meet the requirements;
②, placing the SFC isolation switch cabinet in place by using a hand-pulled chain block, placing the isolation switch cabinet on a basic channel steel by using a closed bus hanging point, and adjusting and aligning to the longitudinal and transverse center lines;
5) laying of 6KV high-voltage cable
①, when loading and unloading the cable reel, the cable on the cable reel should be fixed in advance, and the vehicle should be provided with a measure for preventing the cable reel from rolling back and forth;
②, before laying, making color marks of the cables to prevent wrong connection, wherein when laying the cables, the cable reel should be erected firmly and stably, the distance between the edge of the reel and the ground is not less than 100mm, when pulling the cables, the cables should be led out from the upper part of the reel, and if the armor of the leading-out end is loosened, the armor should be bound tightly;
6) manufacturing method of 6KV high-voltage cable head
The cable terminal adopts a cold contraction manufacturing mode, before cables in a coil are connected, an angle steel bracket is additionally arranged under the coil, then the cables under the coil are arranged in order, the cable is kept neat and beautiful, the radian is consistent, constructors on the coil make marks at the beginning of the cable, and then the cable is pulled to a proper position to manufacture a cable head;
7) control cable laying and wiring
①, after the cable in the disc is laid, the cable is arranged, if the cable is not fixed in the disc, an angle iron bracket and a wire groove are added, and the omission phenomenon of the cable in the disc is checked by contrasting a terminal row diagram;
②, after the cables in the coil are discharged, arranging the cables in the coil, separating the cables according to the position of the terminal row, determining the number of the cables under each row of the terminal row, if more cables are on one coil, arranging all the cables from the middle of the coil, then branching to the terminal rows at two sides, arranging the cables in the coil on one layer of angle iron bracket, and adding another layer of angle iron bracket, wherein the height of the cable head of the first layer is lower than that of the cable head of the inner layer, so that the cable plate is easy to observe;
③ beginning to peel off the cable sheath and armor, using 4mm for the control cable shielding wire2Multiple strands of soft copper grounding wires are connected at intervals of yellow and green, the grounding wires in one disc are gathered and bound, and the grounding wires and the grounding point are reliably grounded; the head making positions of all the control cables are on the same horizontal line, the thicknesses of the cable heads are the same, and the control cables are firmly fixed by nylon binding belts after the cable heads are made;
④, hanging the cable card immediately after the cable head is finished, the specification of the cable card should be consistent, the content of the cable card should be complete, and the glue head should ensure the font direction to be consistent after being worn, the wire cores should not be crossed, so as to achieve the effect of artistic appearance;
⑤, comparing the terminal row, dividing the cable core into proper positions, bending into consistent radian, connecting to the corresponding terminal, not allowing the spare terminal to be used for switching or random wiring, wherein the maximum number of the cable cores on the same terminal can not exceed 2, all the current and voltage loop should be bent, the connection is not allowed, when the terminal is accessed, the radian of the cable cores in the same cabinet is consistent, the cable cores are kept neat and beautiful, when the terminal is connected, the rubber heads are arranged, the consistent direction of the rubber heads is ensured, the observation is convenient, after the wiring is finished, whether all the wiring bolts have loose phenomenon or not is checked again, and the wiring is ensured to be firm and reliable;
8) cleaning site
After the construction is finished, the site garbage is recovered in a centralized way and is subjected to sorting treatment, so that secondary pollution is prevented; the waste materials, waste oil and garbage generated in the construction process are conveyed to a fixed place for storage through special ways.
When the cable is laid, the method also comprises the erection of a scaffold, the scaffold board is paved, no gap or probe board is needed, the lap joint length of the vertical rod and the large cross rod is more than 1.5m, the small end is pressed on the large end when the cable is tied up, and the tying buckles are at least three.
When the cable is laid, the net distance between the cable and the thermal pipeline and between the cable and the thermal equipment is as follows: the parallel laying is more than or equal to 1m, the laying cannot be carried out on the upper part of the thermal pipeline, and the cross laying of the cables is more than or equal to 0.5 m; clear distance between the cable and the heat insulation layer: the parallel laying is more than or equal to 0.5m, and the distance between the cross laying is more than or equal to 0.2 m.
When the cable is fixed in position, horizontally laying the head end and the tail end of the cable, turning the cable and connecting the two ends of the cable, and laying each support point of the cable; the cables which are vertically laid or obliquely laid over 45 degrees are fixed on each bracket at intervals of 2 meters when the cables are laid on the bridge.
The invention has the following positive beneficial effects:
the construction method is adopted to construct and install the camera SFC system, the whole construction quality is ensured, meanwhile, the construction period can be shortened, and the construction method is simple to operate, convenient to maintain and easy to popularize.
Fourthly, the specific implementation mode:
the invention is further explained and illustrated below:
a construction method of a static variable frequency starting system of a large phase modulation machine set comprises the following steps:
preparation work:
1) preparing tools required by construction;
2) and (3) checking the equipment:
①, after the SFC system equipment is transported to the site, the equipment is stored in a place which is dry, ventilated, far away from moisture and contains corrosive gas, and is unpacked for the first time to check whether collision damage phenomena occur due to transportation and other reasons, and the number of parts is checked;
②, after checking and accepting the scattered parts and standard parts, especially copper bus and cable, the parts should be transported to a special storage immediately to prevent the parts from being affected with damp, corroded, damaged and lost due to being stored in an open warehouse;
the method comprises the following operation steps:
1) installation of SFC equipment foundation channel steel
①, firstly correcting blanking of the basic channel steel, cutting according to the designed length, and when the cutting machine is used for blanking, firstly correcting the cutting machine to ensure that the cutting surface of the channel steel is straight;
②, when embedding the basic channel steel, embedding according to the design interval arrangement and the design size, when laying, firstly finding out the civil engineering elevation, after the foundation is installed, the top of the foundation is higher than the floating ground by 5-10mm according to the design;
③, connecting the foundation and the main grounding grid at least at two points, adopting lap welding, wherein the welding length is 2 times of the width of the flat steel, and welding at least two edges;
2) installation of SFC control panel cabinet
The module assembly of the SFC control panel cabinet is slowly translated to the base by adopting a rolling bar and a chain block, the bus contact surface of the SFC control panel cabinet is tightly connected, the bus contact surface is tightly connected with a corresponding angle during fastening, and a connecting bolt is fastened by using a torque wrench;
3) installation of SFC system matched isolation transformer cabinet
①, before the transformer is in place, cleaning the surface of the basic channel steel at the position, and checking whether the specification and the model of the basic channel steel meet the requirements;
②, moving the transformer to the basic channel steel, taking down the rolling bar, adjusting and aligning the rolling bar with the longitudinal and transverse center lines to enable the transformer to be in place, and welding and fixing the transformer after the adjustment is finished;
4) SFC isolation switch cabinet installation
①, before the SFC isolation switch cabinet is in place, cleaning the surface of the basic channel steel at the position, and checking whether the specification and the model of the basic channel steel meet the requirements;
②, placing the SFC isolation switch cabinet in place by using a hand-pulled chain block, placing the isolation switch cabinet on a basic channel steel by using a closed bus hanging point, and adjusting and aligning to the longitudinal and transverse center lines;
5) laying of 6KV high-voltage cable
①, when loading and unloading the cable reel, the cable on the cable reel should be fixed in advance, and the vehicle should be provided with a measure for preventing the cable reel from rolling back and forth;
②, before laying, making color marks of the cables to prevent wrong connection, wherein when laying the cables, the cable reel should be erected firmly and stably, the distance between the edge of the reel and the ground is not less than 100mm, when pulling the cables, the cables should be led out from the upper part of the reel, and if the armor of the leading-out end is loosened, the armor should be bound tightly;
6) manufacturing method of 6KV high-voltage cable head
The cable terminal adopts a cold contraction manufacturing mode, before cables in a coil are connected, an angle steel bracket is additionally arranged under the coil, then the cables under the coil are arranged in order, the cable is kept neat and beautiful, the radian is consistent, constructors on the coil make marks at the beginning of the cable, and then the cable is pulled to a proper position to manufacture a cable head;
7) control cable laying and wiring
①, after the cable in the disc is laid, the cable is arranged, if the cable is not fixed in the disc, an angle iron bracket and a wire groove are added, and the omission phenomenon of the cable in the disc is checked by contrasting a terminal row diagram;
②, after the cables in the coil are discharged, arranging the cables in the coil, separating the cables according to the position of the terminal row, determining the number of the cables under each row of the terminal row, if more cables are on one coil, arranging all the cables from the middle of the coil, then branching to the terminal rows at two sides, arranging the cables in the coil on one layer of angle iron bracket, and adding another layer of angle iron bracket, wherein the height of the cable head of the first layer is lower than that of the cable head of the inner layer, so that the cable plate is easy to observe;
③ beginning to peel off the cable sheath and armor, using 4mm for the control cable shielding wire2Multiple strands of soft copper grounding wires are connected at intervals of yellow and green, the grounding wires in one disc are gathered and bound, and the grounding wires and the grounding point are reliably grounded; the head making positions of all the control cables are on the same horizontal line, the thicknesses of the cable heads are the same, and the control cables are firmly fixed by nylon binding belts after the cable heads are made;
④, hanging the cable card immediately after the cable head is finished, the specification of the cable card should be consistent, the content of the cable card should be complete, and the glue head should ensure the font direction to be consistent after being worn, the wire cores should not be crossed, so as to achieve the effect of artistic appearance;
⑤, comparing the terminal row, dividing the cable core into proper positions, bending into consistent radian, connecting to the corresponding terminal, not allowing the spare terminal to be used for switching or random wiring, wherein the maximum number of the cable cores on the same terminal can not exceed 2, all the current and voltage loop should be bent, the connection is not allowed, when the terminal is accessed, the radian of the cable cores in the same cabinet is consistent, the cable cores are kept neat and beautiful, when the terminal is connected, the rubber heads are arranged, the consistent direction of the rubber heads is ensured, the observation is convenient, after the wiring is finished, whether all the wiring bolts have loose phenomenon or not is checked again, and the wiring is ensured to be firm and reliable;
8) cleaning site
After the construction is finished, the site garbage is recovered in a centralized way and is subjected to sorting treatment, so that secondary pollution is prevented; the waste materials, waste oil and garbage generated in the construction process are conveyed to a fixed place for storage through a special way;
when the cable is laid, the method also comprises the step of erecting a scaffold, wherein a scaffold board is fully paved without gaps and probe boards, the lap joint lengths of the upright stanchions and the large cross bars are both more than 1.5m, the small ends are pressed on the large ends when the cable is bound, and the number of binding buckles is at least three; clear distance between cable and heat distribution pipeline and heat distribution equipment: the parallel laying is more than or equal to 1m, the laying cannot be carried out on the upper part of the thermal pipeline, and the cross laying of the cables is more than or equal to 0.5 m; clear distance between the cable and the heat insulation layer: the parallel laying is more than or equal to 0.5m, and the distance between the cross laying is more than or equal to 0.2 m;
when the cable is fixed in position, horizontally laying the head end and the tail end of the cable, turning the cable and connecting the two ends of the cable, and laying each support point of the cable; the cables which are vertically laid or obliquely laid over 45 degrees are fixed on each bracket at intervals of 2 meters when the cables are laid on the bridge.
The construction method is used for installation and construction, and all the unit assemblies can be installed in the shortest time, so that the overall construction efficiency is improved, and the construction quality is guaranteed.
Claims (4)
1. A construction method of a static variable frequency starting system of a large phase modulation machine set comprises the following steps:
preparation work:
1) preparing tools required by construction;
2) and (3) checking the equipment:
①, after the SFC system equipment is transported to the site, the equipment is stored in a place which is dry, ventilated, far away from moisture and contains corrosive gas, and is unpacked for the first time to check whether collision damage phenomena occur due to transportation and other reasons, and the number of parts is checked;
②, after checking and accepting the scattered parts and standard parts, especially copper bus and cable, the parts should be transported to a special storage immediately to prevent the parts from being affected with damp, corroded, damaged and lost due to being stored in an open warehouse;
the method comprises the following operation steps:
1) installation of SFC equipment foundation channel steel
①, firstly correcting blanking of the basic channel steel, cutting according to the designed length, and when the cutting machine is used for blanking, firstly correcting the cutting machine to ensure that the cutting surface of the channel steel is straight;
②, when embedding the basic channel steel, embedding according to the design interval arrangement and the design size, when laying, firstly finding out the civil engineering elevation, after the foundation is installed, the top of the foundation is higher than the floating ground by 5-10mm according to the design;
③, connecting the foundation and the main grounding grid at least at two points, adopting lap welding, wherein the welding length is 2 times of the width of the flat steel, and welding at least two edges;
2) installation of SFC control panel cabinet
The module assembly of the SFC control panel cabinet is slowly translated to the base by adopting a rolling bar and a chain block, the bus contact surface of the SFC control panel cabinet is tightly connected, the bus contact surface is tightly connected with a corresponding angle during fastening, and a connecting bolt is fastened by using a torque wrench;
installation of SFC system matched isolation transformer cabinet
①, before the transformer is in place, cleaning the surface of the basic channel steel at the position, and checking whether the specification and the model of the basic channel steel meet the requirements;
②, moving the transformer to the basic channel steel, taking down the rolling bar, adjusting and aligning the rolling bar with the longitudinal and transverse center lines to enable the transformer to be in place, and welding and fixing the transformer after the adjustment is finished;
SFC isolation switch cabinet installation
①, before the SFC isolation switch cabinet is in place, cleaning the surface of the basic channel steel at the position, and checking whether the specification and the model of the basic channel steel meet the requirements;
②, placing the SFC isolation switch cabinet in place by using a hand-pulled chain block, placing the isolation switch cabinet on a basic channel steel by using a closed bus hanging point, and adjusting and aligning to the longitudinal and transverse center lines;
5) laying of 6KV high-voltage cable
①, when loading and unloading the cable reel, the cable on the cable reel should be fixed in advance, and the vehicle should be provided with a measure for preventing the cable reel from rolling back and forth;
②, before laying, making color marks of the cables to prevent wrong connection, wherein when laying the cables, the cable reel should be erected firmly and stably, the distance between the edge of the reel and the ground is not less than 100mm, when pulling the cables, the cables should be led out from the upper part of the reel, and if the armor of the leading-out end is loosened, the armor should be bound tightly;
6) manufacturing method of 6KV high-voltage cable head
The cable terminal adopts a cold contraction manufacturing mode, before cables in a coil are connected, an angle steel bracket is additionally arranged under the coil, then the cables under the coil are arranged in order, the cable is kept neat and beautiful, the radian is consistent, constructors on the coil make marks at the beginning of the cable, and then the cable is pulled to a proper position to manufacture a cable head;
control cable laying and wiring
①, after the cable in the disc is laid, the cable is arranged, if the cable is not fixed in the disc, an angle iron bracket and a wire groove are added, and the omission phenomenon of the cable in the disc is checked by contrasting a terminal row diagram;
②, after the cables in the coil are discharged, arranging the cables in the coil, separating the cables according to the position of the terminal rows, determining the number of the cables in each row of terminal rows, if more cables exist in one coil, arranging all the cables from the middle of the coil, then branching the cables to the terminal rows on two sides, arranging the cables in the coil on one layer of angle iron bracket, and adding another layer of bracket instead of arranging the cables in the coil, wherein the height of the cable head of the first layer is lower than that of the cable head of the inner layer, so that the cable brand can be observed easily;
determining the manufacturing position of a cable head, wherein the cable head is manufactured at a position 100mm away from the cable entering the coil cabinet, the cable heads of each row of cables are arranged at the same horizontal height, and the colors of the heat shrinkable tubes for manufacturing the cable heads are uniform;
③ beginning to peel off the cable sheath and armor, using 4mm for the control cable shielding wire2Multiple strands of soft copper grounding wires are connected at intervals of yellow and green, the grounding wires in one disc are gathered and bound, and the grounding wires and the grounding point are reliably grounded; the head making positions of all the control cables are on the same horizontal line, the thicknesses of the cable heads are the same, and the control cables are firmly fixed by nylon binding belts after the cable heads are made;
④, hanging the cable card immediately after the cable head is finished, the specification of the cable card should be consistent, the content of the cable card should be complete, and the glue head should ensure the font direction to be consistent after being worn, the wire cores should not be crossed, so as to achieve the effect of artistic appearance;
⑤, comparing the terminal row, dividing the cable core into proper positions, bending into consistent radian, connecting to the corresponding terminal, not allowing the spare terminal to be used for switching or random wiring, wherein the maximum number of the cable cores on the same terminal can not exceed 2, all the current and voltage loop should be bent, the connection is not allowed, when the terminal is accessed, the radian of the cable cores in the same cabinet is consistent, the cable cores are kept neat and beautiful, when the terminal is connected, the rubber heads are arranged, the consistent direction of the rubber heads is ensured, the observation is convenient, after the wiring is finished, whether all the wiring bolts have loose phenomenon or not is checked again, and the wiring is ensured to be firm and reliable;
cleaning site
After the construction is finished, the site garbage is recovered in a centralized way and is subjected to sorting treatment, so that secondary pollution is prevented; the waste materials, waste oil and garbage generated in the construction process are conveyed to a fixed place for storage through special ways.
2. The construction method of the static variable-frequency starting system of the large phase modulation unit according to claim 1, characterized in that: when the cable is laid, the method also comprises the erection of a scaffold, the scaffold board is paved, no gap or probe board is needed, the lap joint length of the vertical rod and the large cross rod is more than 1.5m, the small end is pressed on the large end when the cable is tied up, and the tying buckles are at least three.
3. The construction method of the static variable-frequency starting system of the large phase modulation unit according to claim 1, characterized in that: when the cable is laid, the net distance between the cable and the thermal pipeline and between the cable and the thermal equipment is as follows: the parallel laying is more than or equal to 1m, the laying cannot be carried out on the upper part of the thermal pipeline, and the cross laying of the cables is more than or equal to 0.5 m; clear distance between the cable and the heat insulation layer: the parallel laying is more than or equal to 0.5m, and the distance between the cross laying is more than or equal to 0.2 m.
4. The construction method of the static variable-frequency starting system of the large phase modulation unit according to claim 1, characterized in that: when the cable is fixed in position, horizontally laying the head end and the tail end of the cable, turning the cable and connecting the two ends of the cable, and laying each support point of the cable; the cables which are vertically laid or obliquely laid over 45 degrees are fixed on each bracket at intervals of 2 meters when the cables are laid on the bridge.
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| CN201911243536.5A CN110971147B (en) | 2019-12-06 | 2019-12-06 | Construction method of static variable-frequency starting system of large-sized camera set |
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| CN201911243536.5A CN110971147B (en) | 2019-12-06 | 2019-12-06 | Construction method of static variable-frequency starting system of large-sized camera set |
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| JP2011024378A (en) * | 2009-07-17 | 2011-02-03 | Fuji Electric Fa Components & Systems Co Ltd | Cradle of draw-out type power reception/distribution apparatus mounted on switchboard and method for assembling the same |
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