CN106786269B - Transformer substation expanding flexible bus installation method - Google Patents
Transformer substation expanding flexible bus installation method Download PDFInfo
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- CN106786269B CN106786269B CN201611199347.9A CN201611199347A CN106786269B CN 106786269 B CN106786269 B CN 106786269B CN 201611199347 A CN201611199347 A CN 201611199347A CN 106786269 B CN106786269 B CN 106786269B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
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Abstract
The invention provides a method for installing a substation expanding flexible bus. The method comprises the following steps: assembling the insulator string; taking the expanded flexible bus off the line; carrying out compression joint on the expanded diameter flexible bus; sequentially mounting the hardware fitting and the insulator string on the expanded diameter soft bus subjected to crimping; and hoisting the installed expanded diameter flexible bus. The installation method of the expanded flexible bus of the transformer substation provided by the invention puts forward the installation sequence of the expanded flexible bus, realizes the guidance of the installation of the expanded flexible bus, enables constructors to accurately install the expanded flexible bus, avoids repeated construction, improves the construction efficiency and also improves the construction process level. In addition, the method also provides guarantee for the future normal operation of the transformer substation.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation, in particular to a method for installing a diameter-expanded flexible bus of a transformer substation.
Background
At present, flexible buses used in the construction of alternating-current ultrahigh-voltage substations in China are expanded-diameter heat-resistant aluminum alloy stranded wires, the installation of the expanded-diameter flexible buses among the substations is an important component of the electrical installation construction of the ultrahigh-voltage substations, and the installation quality directly influences the future operating condition of the substations. The inter-framework crossover construction comprises a plurality of working procedures such as diameter-expanding flexible bus breaking, hardware crimping assembly, hoisting and the like, and the whole workload is large. At present, the same guidance for installing the flexible bus is not provided, and the installation is usually carried out according to the experience of constructors, but the constructors have different technical qualities, cannot accurately install the expanded flexible bus during construction, and often need repeated operation, so that the construction efficiency is lower, and meanwhile, the construction manufacturability is poorer.
Disclosure of Invention
In view of the above, the invention provides a method for installing a substation expanded diameter flexible bus, and aims to solve the problems of low construction efficiency and poor manufacturability caused by the fact that the installation of the existing expanded diameter flexible bus is carried out according to the experience of constructors.
In one aspect, the invention provides a method for installing a substation expanding flexible bus. The method comprises the following steps: assembling the insulator string; taking the expanded flexible bus off the line; carrying out compression joint on the expanded diameter flexible bus; sequentially mounting the hardware fitting and the insulator string on the expanded diameter soft bus subjected to crimping; and hoisting the installed expanded diameter flexible bus.
Further, in the method for installing the substation expanded diameter flexible bus, before assembling the insulator string, the method further comprises: and checking whether the plurality of insulator pieces constituting the insulator string are intact, and if the insulator pieces are damaged, replacing the damaged insulator pieces.
Further, in the method for installing the substation expanded diameter soft bus, the steps of assembling the insulator string and sequentially installing the hardware and the insulator string between the compressed expanded diameter soft buses further include: and carrying out a voltage withstand test on the insulator string, and replacing the insulator string if the test result of the insulator string does not meet the first preset requirement.
Further, in the method for installing the substation expanded diameter flexible bus, assembling the insulator string further includes: and inserting the insulator sheets with different colors among the insulator sheets.
Further, in the installation method of the expanded flexible bus of the transformer substation, the step of taking the expanded flexible bus off line further comprises the step of taking the expanded flexible bus off line according to a formula
Determining the offline length of the expanded flexible bus; in the above formula, L0The length of the lower line of the expanded flexible bus is used; omega0The load is the load of the unit length of the insulator string, wherein if the insulator string is in a duplex type, the load of the unit length of the insulator string is calculated according to the total substitution of the multiple strings; omega is the load of the expanded flexible bus in unit length, wherein if the expanded flexible bus is in a multi-split type, the load of the expanded flexible bus in unit length is calculated according to the total multi-split substitution; lambda is the length of the insulator string at one side of the expanded diameter flexible bus in the gear, l is the horizontal distance of the connecting line position of the hanging point, fmFor designing a given sag value, beta is an included angle between a connecting line of hanging points and the horizontal,
and performing offline according to the offline length of the expanded flexible bus.
Further, in the method for installing the substation expanded diameter flexible bus, the crimping the expanded diameter flexible bus further includes: cleaning the inner layer of the crimping clamp; coating conductive grease on the outer surface of the expanded flexible bus and crimping the expanded flexible bus; and polishing the compression joint of the expanded diameter soft bus.
Further, in the method for installing the substation expanded diameter flexible bus, the step of sequentially installing the hardware and the insulator string on the compressed expanded diameter flexible bus further includes: and placing a plurality of sub-conductors of the expanded diameter soft bus in parallel, determining the installation position of the hardware fitting, and installing the hardware fitting on the compressed expanded diameter soft bus.
Further, in the method for installing the substation expanded diameter flexible bus, after the installed expanded diameter flexible bus is hoisted, the method further includes: measuring the sag of the expanded diameter flexible bus; and detecting whether the sag of the hoisted expanded flexible bus meets a second preset requirement, and if not, adjusting the expanded flexible bus to meet the second preset requirement.
Further, in the method for installing the expanded diameter flexible bus of the transformer substation, measuring the sag of the expanded diameter flexible bus further includes: if the first hanging point and the second hanging point have no height difference, selecting a first point below the expanded diameter soft bus, and calibrating a level surface at the first point; measuring the vertical distance between the first hanging point or the second hanging point and the level surface for multiple times, and determining the arithmetic average of the vertical distances obtained by the multiple measurements as the first distance; measuring the vertical distances between the midpoint of a connecting line of the first hanging point and the second hanging point and a plurality of points which are preset distances away from the midpoint and the level surface, and determining the minimum distance in the vertical distances between the measured midpoint and the vertical distances between the expanded diameter soft bus at the positions of the plurality of points which are preset distances away from the midpoint and the level surface as a second distance; and determining the difference between the first distance and the second distance as the sag of the expanded diameter soft bus.
Further, in the installation method of the expanded diameter flexible bus of the transformer substation, the measuring the sag of the expanded diameter flexible bus further comprises: if the first hanging point and the second hanging point have height difference, selecting a second point below the first hanging point, selecting a third point below the second hanging point, and enabling a connecting line between the second point and the third point to be parallel to a connecting line between the first hanging point and the second hanging point; and when a connecting line between the second point and the third point is tangent to the expanded diameter soft bus, determining the distance between the second point and the first hanging point as the sag of the expanded diameter soft bus.
Further, in the transformer substation expanding soft bus installation method, detecting whether the sag of the expanded soft bus after the hoisting meets a first preset requirement, if not, adjusting the expanded soft bus until the expanded soft bus meets the first preset requirement, and then: and detecting whether the bending degree and the sag among the plurality of expanded diameter soft buses in the same span and the bending degree and the sag among the plurality of sub-conductors of each soft bus meet corresponding preset requirements, and if not, adjusting each expanded diameter soft bus and the plurality of sub-conductors of each soft bus until the corresponding preset requirements are met.
The invention provides the installation sequence of the expanded flexible bus, realizes the guidance of the installation of the expanded flexible bus, ensures that constructors can accurately install the expanded flexible bus, avoids repeated construction, improves the construction efficiency and also improves the construction process level. In addition, the method also provides guarantee for the future normal operation of the transformer substation.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention;
fig. 2 is a schematic view of hoisting an expanded flexible bus in the method for installing the expanded flexible bus in the transformer substation provided by the embodiment of the invention;
fig. 3 is another flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention;
fig. 4 is another flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention;
fig. 5 is another flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention;
fig. 6 is another flowchart of a method for installing a substation expanded-diameter flexible bus according to an embodiment of the present invention;
fig. 7 is another flowchart of a method for installing a substation expanded-diameter flexible bus according to an embodiment of the present invention;
fig. 8 is another flowchart of a method for installing a substation expanded-diameter flexible bus according to an embodiment of the present invention;
fig. 9 is another flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention;
fig. 10 is a schematic view of sag measurement of the expanded diameter flexible bus in the method for installing the expanded diameter flexible bus in the transformer substation according to the embodiment of the present invention;
fig. 11 is another flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, fig. 1 is a flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention. As shown, the method comprises the following steps:
step S1, the insulator string is assembled.
Specifically, before the installation of the expanded diameter flexible bus is started, the critical dimension of a cross-line framework hanging point of a civil engineering construction part can be retested and commonly recognized. And (5) making background on the technical key points, drawing requirements, operation instruction books and other contents of the construction teams. Preparing tools for construction, ensuring that the performance of the tools can meet the operation requirement, and then assembling the insulator string. Insulator strings adopted by overline between 1000kV and 500 kV-class frameworks are usually in a double I type, the insulator strings generally comprise structures such as shed sheaths, end fittings and a plurality of insulator pieces, before the insulator strings are installed, the structures such as the shed sheaths, the end fittings and the insulator pieces need to be assembled into the insulator strings, and the insulator pieces in different colors are inserted between the insulator pieces according to drawing requirements. The spring pin openings are arranged towards the upper side or the side surface and not towards the lower side during assembly, and the opening directions are uniform. In addition, the insulator sheets should be protected from damage during assembly. It should be noted that the assembly method of the insulator string is well known to those skilled in the art, and will not be described herein.
And step S2, inserting the expanded flexible bus into the production line.
Specifically, according to construction requirements, a diameter-expanding flexible bus with a certain length is cut off from a wire coil.
Step S3 is to crimp the expanded diameter flexible bus bar.
Specifically, generally, the diameter-expanded flexible bus bar between the frames is split into a plurality of pieces, and therefore the diameter-expanded flexible bus bar is crimped. It should be noted that, the crimping method of the expanded diameter flexible bus bar is well known to those skilled in the art, and is not described herein again.
And step S4, sequentially mounting the hardware and the insulator string on the diameter-expanding soft bus which is subjected to pressure welding.
Specifically, a fitting, which may be a spacer or the like, is first mounted on the expanded diameter soft bus bar that has been subjected to crimping. And then the insulator string is arranged on the expanded diameter soft bus which is subjected to crimping. In a specific implementation, referring to fig. 2, the expanded diameter soft bus 1 may be first moved down to the lower side of the connection rail, then the first end (the upper end shown in fig. 2) of the first insulator string 2 is lifted by using a crane to suspend the first insulator string 2, and then the second end (the lower end shown in fig. 2) of the first insulator string 2 is connected to the first end (the right end shown in fig. 2) of the expanded diameter soft bus 1. The connection method of the second insulator string 4 and the second end (left end shown in fig. 2) of the expanded diameter soft bus 1 may refer to the connection method of the first insulator string 2 and the first end of the expanded diameter soft bus 1, and is not described herein again.
And step S5, hoisting the installed expanded diameter soft bus.
Specifically, after the first end of the expanded-diameter flexible bus bar 1 is connected with the first insulating sub-string 2, the expanded-diameter flexible bus bar 1 is lifted by using a crane, and the first end of the expanded-diameter flexible bus bar 1 is connected to a hanging point of the first framework 3. In the lifting process of the first end of the expanded flexible bus 1, ground personnel need to manually lift and move the part of the ground expanded flexible bus, so that hard friction between the expanded flexible bus 1 and the ground is avoided. And after the second end of the expanded soft bus 1 is connected with the second insulator string 4, starting a grinder to tighten the steel wire rope 5, pulling the second end of the expanded soft bus to a hanging point of a second framework 6, and naturally unhooking the steel wire rope 7 of the crane in the process. And (4) continuously lifting the cable by a grinder, and finally completing the connection of the U-shaped hanging ring of the expanded flexible bus and the hanging point of the second framework 6 by workers near the hanging point of the second framework 6. In the lifting process of the second end of the expanded diameter soft bus 1, ground personnel need to pull the ground control rope 8 laterally to ensure that the expanded diameter soft bus is controlled not to collide with ground equipment in the lifting process.
It can be seen that, in the embodiment, the order of installing the expanded diameter flexible bus is provided, the guidance for installing the expanded diameter flexible bus is realized, so that constructors can accurately install the expanded diameter flexible bus, repeated construction is avoided, the construction efficiency is improved, and meanwhile, the construction process level is also improved. In addition, the method also provides guarantee for the future normal operation of the transformer substation.
Referring to fig. 3, fig. 3 is another flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention. As shown, the method comprises the following steps:
and step S6, checking whether the plurality of insulator pieces forming the insulator string are intact, and if the insulator pieces are damaged, replacing the damaged insulator pieces.
Specifically, before the insulator string is assembled, whether the appearance and the porcelain quality of each insulator sheet are intact or not needs to be checked, whether steel parts used for connecting each insulator sheet are intact or not needs to be checked, and whether the steel parts used for connecting the insulator sheets are rustless or not needs to be checked, and if the insulator sheets are damaged and/or the steel parts used for connecting the insulator sheets are damaged or rusted, the insulator sheets need to be replaced in time.
Step S1, the insulator string is assembled.
And step S2, inserting the expanded flexible bus into the production line.
Step S3 is to crimp the expanded diameter flexible bus bar.
And step S4, sequentially mounting the hardware and the insulator string on the diameter-expanding soft bus which is subjected to pressure welding.
And step S5, hoisting the installed expanded diameter soft bus.
It should be noted that, in this embodiment, the specific implementation processes of step S1, step S2, step S3, step S4 and step S5 may refer to the above embodiments, and this embodiment is not described herein again.
In the embodiment, before the insulator string is assembled, whether each insulator sheet forming the insulator string is damaged or not is checked, so that the integrity of the insulator string is ensured, and meanwhile, the performance of the insulator string is not influenced.
Referring to fig. 4, fig. 4 is a further flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention. As shown, the method comprises the following steps:
and step S6, checking whether the plurality of insulator pieces forming the insulator string are intact, and if the insulator pieces are damaged, replacing the damaged insulator pieces.
Step S1, the insulator string is assembled.
And step S7, performing a voltage withstand test on the insulator string, and replacing the insulator string if the test result of the insulator string does not meet the first preset requirement.
Specifically, a withstand voltage test is carried out on the insulator string, and if the test result does not meet the first preset requirement, the insulator string needs to be replaced. The first preset requirement may be that the insulator string has no partial discharge phenomenon. It should be noted that the first preset requirement may be determined according to a test requirement, and this embodiment does not limit the first preset requirement.
And step S2, inserting the expanded flexible bus into the production line.
Step S3 is to crimp the expanded diameter flexible bus bar.
And step S4, sequentially mounting the hardware and the insulator string on the diameter-expanding soft bus which is subjected to pressure welding.
And step S5, hoisting the installed expanded diameter soft bus.
It should be noted that, in this embodiment, specific implementation processes of step S6, step S1, step S2, step S3, step S4 and step S5 may refer to the above embodiment, and this embodiment is not described herein again. Step S7 is not in the order of determination step S2 and step S3.
In the embodiment, the voltage withstand test is carried out on the insulator string, so that the insulator string is free of problems of local defects, dampness, aging and the like, and the normal operation of a circuit is further ensured.
Referring to fig. 5, in an embodiment of the present invention, the step S2 of taking the expanded flexible bus bar out of line may further include:
step S21, according to the formula
Determining the down-line length of the expanded flexible bus, wherein L is0The unit is m for the offline length of the expanded flexible bus; omega0The load is the load of the unit length of the insulator string, wherein if the insulator string is in a duplex type, the load of the unit length of the insulator string is calculated according to the total substitution of the multiple strings, and the unit is N/m; omega is the load of the expanded flexible bus in unit length, wherein if the expanded flexible bus is in a multi-split type, the load of the expanded flexible bus in unit length is calculated according to the total multi-split type, and the unit is N/m; lambda is the length of the insulator string at one side of the inner diameter-expanded flexible bus and the unit is m; l is the horizontal distance of the connecting line position of the hanging points, and the unit is m; f. ofmFor designing a given sag value, the unit is m; beta is an included angle between a connecting line of the hanging points and the horizontal plane;
the pitch ratio coefficient of the insulator string is taken as the pitch ratio coefficient;
the weight ratio coefficient of an insulator string (duplex) to an expanded diameter soft bus (multi-split) is shown.
Specifically, first, relevant data required for the offline of the expanded diameter flexible bus is collected, and the collected relevant data may include: hanging point span, insulator string length weight, wire weight, etc. The length error of the expanded diameter flexible bus is very sensitive to the influence of the sag of the installed expanded diameter flexible bus, so that the requirements on the span of the expanded diameter flexible bus and the accurate determination of the size of the insulator string are high. The determination of the span of the connecting line of the hanging points can be adoptedAnd measuring by using a handheld visible laser range finder, wherein the measured data is the linear distance between the hanging points. When the laser range finder is used for measuring the span of the link line of the link point, a worker is arranged to climb to the position near the link point on one side of the link line by carrying the range finder, the worker holds the range finder and pushes the bottom of the handheld range finder against the outer edge of the link point of the framework, the screen is opened, the screen displays a zoom adjusting method, the method is used for measuring the distance of the link point, observing the position of the laser point, projecting the laser point to the outer edge of the other link point of the link line, and recording the reading of the span of the link line of the link point. Each span may be measured and arithmetically averaged a number of times, for example three times. When the hanging point has no height difference, the hanging point connecting line span is the horizontal distance l of the hanging point connecting line position; when the hanging points have height difference, the height difference value of the hanging points in the construction drawing can be used as the actual height difference, and the horizontal projection of the hanging point connecting line span is the horizontal distance l of the hanging point connecting line position. The insulator string length lambda can be determined by adopting a direct measurement mode, namely after the insulator string and hardware fittings are assembled, the insulator string is vertically lifted by an automobile crane, and the distance between a U-shaped hanging ring and a strain clamp hanging ring measured by a steel tape in a naturally drooping state is the length of the insulator string. When measuring the length of the insulator string of the 1000kV four-split conductor, the lengths of the insulator string of the upper and lower conductors are different, and the lengths are measured respectively. According to the temperature-sag-tension table given by the construction drawing, the design given sag f of the stop line can be determined according to the environment temperature during constructionm。ω0The unit length load of the insulator string is calculated according to the total number of the multiple strings if the insulator string is in a duplex type, namely the unit length load of the duplex type insulator string is the quotient of the total load of the insulator string and the length of the single string insulator string, for example, the duplex type insulator string is formed by connecting two insulator strings in parallel, the total load of the two insulator strings is 200N, the length of each insulator string is equal and is 1.5m, and the unit length load of the duplex type insulator string is 200N/1.5 m. Omega is the load of the expanded diameter soft bus per unit length, wherein if the expanded diameter soft bus is in a multi-split type, the load of the expanded diameter soft bus per unit length is calculated according to the total multi-split substitution,that is, the load per unit length of the expanded flexible bus is the quotient of the total load of the expanded flexible bus and the length of a single expanded flexible bus, for example, a four-split type expanded flexible bus is formed by connecting four expanded flexible buses in parallel, the total load of the four expanded flexible buses is 1000N, the length of each expanded flexible bus is equal and 6m, and the load per unit length of the four-split type expanded flexible bus is 1000N/6 m. After the related data is collected, according to the formula
And determining the down line length of the expanded flexible bus.
And step S22, performing offline according to the offline length of the expanded flexible bus.
Specifically, the expanded diameter soft bus is discharged from a wire coil, the expanded diameter soft bus is printed, bound and cut off according to the offline length of the expanded diameter soft bus, the cut-off port is ensured to be vertical to the axis of the expanded diameter soft bus, and the cut-off port is polished.
Compared with the prior art, in the embodiment, the offline length of the expanded flexible bus is calculated according to a formula and offline of the expanded flexible bus, the influence of the insulator string on the sag of the expanded flexible bus is considered, the offline length of the expanded flexible bus can be accurately determined, the design requirement is met, the actual stress condition of the expanded flexible bus is closer to, the influence of the error of the length of the expanded flexible bus on the sag of the installed expanded flexible bus is reduced, and the problem of inaccuracy of the offline length of the expanded flexible bus caused by the fact that a constructor determines the offline length of the expanded flexible bus according to experience or a horizontal projectile line is solved.
Referring to fig. 6, in an embodiment of the present invention, the crimping of the expanded diameter flexible bus bar in step S3 may further include:
and step S31, cleaning the inner layer of the crimping clamp.
Step S32, conductive grease is applied to the outer surface of the expanded diameter flexible bus bar, and the expanded diameter flexible bus bar is crimped.
Specifically, the outer surface of the expanded diameter flexible bus bar is coated with conductive grease, and the single wire is used for filling the gap of the expanded diameter flexible bus bar. Then, the expanded flexible bus is rotated to penetrate into the wire clamp crimping pipe, and the rotating direction is consistent with the direction of the stranded wire of the expanded flexible bus. And a plastic film is wrapped at the position of the line clamp compression joint so as to facilitate demoulding, and the overlap of two adjacent moulds can be more than 5 mm. Then, the expanded flexible bus bar is crimped, and the crimping operation is kept under a certain pressure for a certain time, for example, the crimping operation is kept under a pressure of 80MPa for 5 s.
And step S33, polishing the pressure welding position of the expanded diameter soft bus.
Specifically, after the diameter-expanded flexible bus is crimped, the crimping part of the wire clamp is polished to ensure smooth transition and no burr of the crimping part.
In the embodiment, the conductive grease is coated outside the expanded flexible bus, so that the conductive performance of the expanded flexible bus can be improved, and the compression joint of the expanded flexible bus can be polished to ensure smooth transition and no burrs at the compression joint part, so that the installation quality of the expanded flexible bus is improved.
In one embodiment of the present invention, the step S4 of sequentially mounting the metal tool and the insulator string on the crimped diameter-expanded flexible bus bar may further include:
when the expanded diameter soft bus is multi-split, a plurality of sub-conductors of the expanded diameter soft bus can be placed in parallel. In specific implementation, a plurality of sub-conductors of the expanded diameter flexible bus can be placed in parallel. And measuring and marking the installation positions of the spacing rods along the same direction by the plurality of sub-conductors, and installing the spacing rods on the plurality of sub-conductors.
In this embodiment, the plurality of sub-conductors of the expanded diameter flexible bus are placed in parallel, and the distance is measured simultaneously for the plurality of sub-conductors, so that the parallel arrangement of the spacers can be ensured, the interaction force among the plurality of sub-conductors can be reduced, and the hoisted expanded diameter flexible bus is more beautiful.
Referring to fig. 7, fig. 7 is a further flowchart of a method for installing a substation expanded-diameter flexible bus according to an embodiment of the present invention. As shown, the method comprises the following steps:
and step S6, checking whether the plurality of insulator pieces forming the insulator string are intact, and if the insulator pieces are damaged, replacing the damaged insulator pieces.
Step S1, the insulator string is assembled.
And step S7, performing a voltage withstand test on the insulator string, and replacing the insulator string if the test result of the insulator string does not meet the first preset requirement.
And step S2, inserting the expanded flexible bus into the production line.
Step S3 is to crimp the expanded diameter flexible bus bar.
And step S4, sequentially mounting the hardware and the insulator string on the diameter-expanding soft bus which is subjected to pressure welding.
And step S5, hoisting the installed expanded diameter soft bus.
And step S8, measuring the sag of the expanded diameter soft bus.
Specifically, after the hoisting of the expanded diameter flexible bus is completed, a certain sag exists, and during specific implementation, the sag of the hoisted expanded diameter flexible bus can be measured by using a level gauge and a laser range finder. The measured sag value is substantially the height difference between the lowest point of the expanded diameter soft bus and the hanging point.
And step S9, detecting whether the sag of the lifted expanded diameter soft bus meets a second preset requirement, and if not, adjusting the expanded diameter soft bus until the second preset requirement is met.
Specifically, whether the sag f of the hoisted expanded flexible bus meets a second preset requirement is detected, for example, the sag f of the expanded flexible bus and the design given sag f are detectedmWhether the error between the two is + 5% to-2.5% or not. And if the sag does not meet the second preset requirement, adjusting the expanded diameter soft bus until the second preset requirement is met. In specific implementation, if f exceeds the allowable range and is larger, the adjustment can be realized by tightening the turnbuckles at the two ends of the expanded diameter soft bus; if f is beyond the allowable range and is smaller, the sag can be increased by adding a U-shaped hanging ring at the hanging point.
It should be noted that, in this embodiment, specific implementation processes of step S6, step S1, step S7, step S2, step S3, step S4, and step S5 may refer to the above embodiments, and this embodiment is not described herein again.
In the embodiment, the sag of the hoisted soft bus is detected, and when the sag does not meet the second preset requirement, the diameter-expanded soft bus is adjusted until the second preset requirement is met, so that the safety distance between the diameter-expanded soft bus and the ground is ensured, and the overlarge pulling force borne by the diameter-expanded soft bus is prevented.
Referring to fig. 8, in an embodiment of the present invention, the measuring sag of the expanded soft bus bar at step S7 may further include:
and step S81, if the first hanging point and the second hanging point have no height difference, selecting a first point below the expanded diameter soft bus, and calibrating a level surface at the first point.
Specifically, when there is no height difference between the first hanging point and the second hanging point, a first point may be selected at any position near a position below (below shown in fig. 2) the lifted expanded diameter flexible bus 1, a leveling tripod may be erected at the first point, the leveling may be adjusted to a horizontal state, and then the leveling may be calibrated.
And step S82, measuring the vertical distance between the first hanging point or the second hanging point and the level surface for multiple times, and determining the arithmetic average of the vertical distances obtained by the multiple measurements as the first distance.
Specifically, the rod is erected below the first hanging point or the second hanging point, and the reading of the rod is read by the level, and the reading is the reading of the calibrated horizontal plane. And then the distance between the first hanging point or the second hanging point and the reading of the ruler rod is measured by using the laser range finder, namely the distance between the first hanging point or the second hanging point and the level surface, and the arithmetic mean value h can be measured and measured for multiple times1And the arithmetic mean value h1Determined as the first distance.
Step S83, measuring the vertical distances between the diameter-expanding flexible bus and the level surface at the midpoint of the connecting line of the first hanging point and the second hanging point and the positions of a plurality of points which are preset distances away from the midpoint, and determining the minimum distance in the measured midpoint and the vertical distances between the plurality of points which are preset distances away from the midpoint and the level surface as a second distance.
Specifically, a midpoint of a connecting line of the first hanging point and the second hanging point and a plurality of points which are a preset distance away from the midpoint are taken, and the preset distance between the expanded diameter soft bus at the midpoint and the points and the level surface is measured. For example, take the firstThe middle point of the connecting line of the hanging point and the second hanging point and each point 1m before and after the middle point are arranged, then the ruler rod is erected under the diameter-expanding soft bus, the distance between the diameter-expanding soft bus and the leveling surface at each point is measured, and the minimum value h is taken2Will minimize the value h2Determined as the second distance. It should be noted that the preset distance may be determined according to actual situations, and this embodiment does not limit the preset distance.
And step S84, determining the difference between the first distance and the second distance as the sag of the expanded diameter soft bus.
Specifically, the difference between the first distance and the second distance is determined as the sag of the expanded diameter soft bus, that is, the sag f of the expanded diameter soft bus is h1-h2。
In this embodiment, when there is no height difference between the first hanging point and the second hanging point, the leveling instrument and the laser range finder are used in cooperation, so that the sag of the expanded diameter flexible bus can be accurately measured, and it is beneficial to judge whether the sag meets the second preset requirement, and the installation quality of the expanded diameter flexible bus is further improved.
Referring to fig. 9, in an embodiment of the present invention, the step S7 of measuring the sag of the expanded-diameter flexible bus bar may further include:
step S85, if the first hanging point and the second hanging point have height difference, the second point is selected below the first hanging point, the third point is selected below the second hanging point, and the connecting line between the second point and the third point is parallel to the connecting line between the first hanging point and the second hanging point.
Specifically, referring to fig. 10, when there is no height difference between the first hanging point a and the second hanging point B, scales may be respectively disposed under the first hanging point a and the second hanging point B, and then the second hanging point a may be selected from the scales under the first hanging point a1And a second point A1Setting the observation starting point as the same, and selecting a third point B at the same distance of the scale below the second hanging point B1And a third point B1Set as the observation target point such that the second point A1To a third point B1The connecting line between the first hanging point A and the second hanging point B is parallel to the connecting line between the first hanging point A and the second hanging point B, namely the first hanging point A, the second hanging point B and theAnd two equidistant second points A under the first hanging point A and the second hanging point B1And a third point B1Forming a parallelogram.
And step S86, when the connecting line between the second point and the third point is tangent to the expanded diameter soft bus, determining the distance between the second point and the first hanging point as the sag of the expanded diameter soft bus.
Specifically, when the second point A is reached1To a third point B1The connecting line between the two is tangent with the expanded diameter flexible bus 1, namely when the observation sight line A1B1When the flexible bus bar is tangent to the expanded diameter flexible bus bar 1, the sag value of the expanded diameter flexible bus bar 1 is AA at the moment1Distance, i.e. f ═ AA1。
In this embodiment, when there is no height difference between the first hanging point and the second hanging point, a three-point-one-line method may be used, that is, the second point a1A third point B1The method of being on the same straight line with the tangent point can accurately measure the sag of the expanded diameter flexible bus 1, which is more in line with the actual situation, and the method is simple and easy to realize.
Referring to fig. 11, fig. 11 is a further flowchart of a method for installing a substation expanded diameter flexible bus according to an embodiment of the present invention. As shown, the method comprises the following steps:
and step S6, checking whether the plurality of insulator pieces forming the insulator string are intact, and if the insulator pieces are damaged, replacing the damaged insulator pieces.
Step S1, the insulator string is assembled.
And step S7, performing a voltage withstand test on the insulator string, and replacing the insulator string if the test result of the insulator string does not meet the first preset requirement.
And step S2, inserting the expanded flexible bus into the production line.
Step S3 is to crimp the expanded diameter flexible bus bar.
And step S4, sequentially mounting the hardware and the insulator string on the diameter-expanding soft bus which is subjected to pressure welding.
And step S5, hoisting the installed expanded diameter soft bus.
And step S8, measuring the sag of the expanded diameter soft bus.
And step S9, detecting whether the sag of the lifted expanded diameter soft bus meets a second preset requirement, and if not, adjusting the expanded diameter soft bus until the second preset requirement is met.
And step S10, detecting whether the bending degree and the sag among the plurality of expanded diameter soft buses in the same span and the bending degree and the sag among the plurality of sub-conductors of each soft bus meet corresponding preset requirements, and if not, adjusting each expanded diameter soft bus and the plurality of sub-conductors of each soft bus until the corresponding preset requirements are met.
Specifically, whether the bending degree and the sag among the plurality of diameter-expanded soft buses in the same span and the bending degree and the sag among the plurality of sub-conductors of each soft bus meet corresponding preset requirements are detected, for example, whether the bending degree and the sag among the plurality of diameter-expanded soft buses in the same span are consistent and whether branch lines in the same arrangement have the same bending degree and sag are detected. And if the requirements do not meet the corresponding preset requirements, adjusting each expanded diameter soft bus and each sub-conductor until the corresponding preset requirements are met. It should be noted that the preset requirement may be determined according to actual needs, and this embodiment does not limit the preset requirement at all.
It should be noted that, in this embodiment, specific implementation processes of step S6, step S1, step S7, step S2, step S3, step S4, step S5, step S8, and step S9 may refer to the above-mentioned embodiment, and this embodiment is not described herein again.
In the embodiment, the curvature and the sag among the plurality of expanded diameter soft buses in the same span and the curvature and the sag among the sub-conductors are detected so as to meet corresponding preset requirements, so that the construction process level among the plurality of expanded diameter soft buses and among the sub-conductors in the same span is ensured, and further guarantee is provided for normal operation of a line.
In conclusion, the order of installing the expanded flexible bus is provided, so that the installation of the expanded flexible bus is guided, the constructor can accurately install the expanded flexible bus, repeated construction is avoided, the construction efficiency is improved, and meanwhile, the construction process level is also improved. In addition, the method also provides guarantee for the future normal operation of the transformer substation.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A transformer substation expanding flexible bus installation method is characterized by comprising the following steps:
assembling the insulator string, wherein the openings of the spring pins face to the upper side or the side surface during assembling, and the directions of the openings are uniform;
according to the formula
Determining the offline length of the expanded flexible bus;
in the above formula, L0The length of the lower line of the expanded diameter flexible bus is taken as the length of the lower line of the expanded diameter flexible bus; omega0The unit length load of the insulator string is obtained, wherein if the insulator string is in a duplex type, the unit length load of the insulator string is calculated according to the total substitution of the multiplex string; omega is the unit length load of the expanded diameter soft bus, wherein if the expanded diameter soft bus is in a multi-split type, the unit length load of the expanded diameter soft bus is calculated according to the total multi-split substitution; lambda is the length of the insulator string at one side of the expanded diameter soft bus in the gear, l is the horizontal distance of the connecting line position of the hanging points, fm is the designed given sag value, beta is the included angle between the connecting line of the hanging points and the horizontal,
inserting the diameter-expanded flexible bus into the line according to the length of the inserted line of the diameter-expanded flexible bus;
carrying out compression joint on the expanded diameter flexible bus;
sequentially installing a hardware fitting and the insulator string on the diameter-expanded soft bus which is subjected to compression joint, placing a plurality of sub-conductors of the diameter-expanded soft bus in parallel when the diameter-expanded soft bus is multi-split, measuring and marking installation positions of the spacing rods along the same direction, and installing the spacing rods on the plurality of sub-conductors;
hoisting the installed expanded flexible bus, measuring whether the error between the sag f of the expanded flexible bus and the designed sag fm is + 5% -2.5%, if f exceeds the allowable range and is larger than the allowable range, the diameter-expanded flexible bus bar is adjusted by tightening the turnbuckles at the two ends of the diameter-expanded flexible bus bar, if f exceeds the allowable range and is smaller, increasing the sag by adding a U-shaped hanging ring at a hanging point, detecting whether the bending degree and the sag among the plurality of expanded diameter soft buses in the same span are the same, and whether the bending degree and the sag among the plurality of sub-conductors of each soft bus are the same, if not, adjusting each expanded diameter soft bus and each sub-conductor until the curvature and sag among the plurality of expanded diameter soft buses are the same, and the curvature and sag among the plurality of sub-conductors of each soft bus are the same;
wherein the measuring the sag of the expanded diameter soft bus further comprises:
if the first hanging point and the second hanging point of the expanded diameter soft bus do not have height difference, selecting a first point below the expanded diameter soft bus, and calibrating a level surface at the first point; measuring the vertical distance between the first hanging point or the second hanging point and the level surface for multiple times, and determining the arithmetic average of the vertical distances obtained by the multiple measurements as a first distance; measuring the vertical distances between the midpoint of the connecting line of the first hanging point and the second hanging point and the plurality of points which are preset distances away from the midpoint and the level surface, and determining the minimum distance in the measured vertical distances between the midpoint and the plurality of points which are preset distances away from the midpoint and the level surface as a second distance; determining the difference between the first distance and the second distance as the sag of the expanded diameter soft bus;
if the first hanging point and the second hanging point have a height difference, selecting a second point below the first hanging point, selecting a third point below the second hanging point, and enabling a connecting line between the second point and the third point to be parallel to a connecting line between the first hanging point and the second hanging point; and when a connecting line between the second point and the third point is tangent to the diameter-expanded flexible bus, determining the distance between the second point and the first hanging point as the sag of the diameter-expanded flexible bus.
2. The substation expanding flexible busbar installation method according to claim 1, further comprising, before the assembling the insulator string:
checking whether a plurality of insulator pieces constituting the insulator string are intact, and if the insulator pieces are damaged, replacing the damaged insulator pieces.
3. The method for installing the substation expanding flexible bus bar according to claim 1, wherein the assembling the insulator string and the sequentially installing the hardware and the insulator string between the expanded flexible bus bars which are subjected to crimping further comprises:
and carrying out a voltage withstand test on the insulator string, and replacing the insulator string if the test result of the insulator string does not meet a first preset requirement.
4. The substation expanding flexible bus installation method according to claim 1, wherein the assembling of the insulator string further comprises:
and inserting insulator sheets with different colors among the insulator sheets.
5. The substation expanding flexible busbar installation method according to claim 1, wherein the crimping the expanding flexible busbar further comprises:
cleaning the inner layer of the crimping clamp;
coating conductive grease on the outer surface of the expanded diameter flexible bus and crimping the expanded diameter flexible bus;
and polishing the compression joint of the expanded diameter flexible bus.
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