CN112736813A - Pipe bus clamp and construction method thereof - Google Patents

Pipe bus clamp and construction method thereof Download PDF

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Publication number
CN112736813A
CN112736813A CN202011602209.7A CN202011602209A CN112736813A CN 112736813 A CN112736813 A CN 112736813A CN 202011602209 A CN202011602209 A CN 202011602209A CN 112736813 A CN112736813 A CN 112736813A
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anchor ear
wedge
hoop
unit
pipe bus
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CN112736813B (en
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张仁奇
张义钊
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Guizhou Power Grid Co Ltd
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Guizhou Power Grid Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
    • 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
    • H02G5/06—Totally-enclosed installations, e.g. in metal casings
    • H02G5/061—Tubular casings

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Clamps And Clips (AREA)

Abstract

The invention discloses a pipe bus clamp and a construction method thereof, and the pipe bus clamp comprises an upper conductive hoop, a lower conductive hoop, an embedded ring and wedges, wherein steps are arranged on two sides of the upper hoop, four die drawing grooves are formed in the upper surface of each step, extension sections are arranged at the upper ends of two sides of the lower conductive hoop and are arranged in an inverted L-shaped structure, four die drawing surfaces corresponding to the four die drawing grooves are arranged on the upper inner side of each extension section, the four die drawing grooves and the four die drawing surfaces form four rectangular wedge grooves respectively, the four wedges are inserted into the four rectangular wedge grooves respectively to fix the upper hoop and the lower hoop, and the embedded ring is axially provided with a notch and is elastically arranged in a round hole formed between the upper hoop and the lower hoop. The pipe bus clamp is in interference fit with the pipe bus conductor, so that the contact resistance is reduced; the connecting device does not use a heterogeneous material as a connecting bearing part, avoids overlarge stress, ensures that the main body of the pipe bus clamp is in an elastic range, and prevents the contact surface of the connecting pipe bus clamp on a wiring conductor after cold and hot circulation from being loosened and oxidized by gaps.

Description

Pipe bus clamp and construction method thereof
Technical Field
The invention belongs to the technical field of pipe bus clamps, and particularly relates to a pipe bus clamp and a construction method thereof.
Background
In a transformer substation with the voltage of above 220kV, an aluminum pipe (a pipe bus) is commonly used for a transformer substation bus, and current needs to be drained to a lead from the pipe bus through a pipe bus drainage wire clamp. The female drainage fastener of traditional pipe is usually spiral and the Y crimping formula of L, and the common characteristics of their structures are: the wire clamp comprises an upper semicircular hoop and a lower semicircular hoop, the semicircular hoop and the lower semicircular hoop are connected through a steel bolt, the steel bolt is screwed down to enable the upper semicircular hoop and the lower semicircular hoop to tightly hold the aluminum pipe, and then a current drainage wiring board or a current drainage crimping pipe on the lower semicircular hoop drains current to a wire. The main function of the tubular bus drainage wire clamp is to transmit current, so that the current-carrying capacity is high. High strength and is made of aluminum alloy for multiple purposes. The wire clamp is fastened by a bolt, bears pre-tightening stress and has certain requirements on the mechanical property of alloy, but the wire clamp of the type is an accessory part of matched equipment, and the wire clamp can meet the requirements generally after passing a temperature rise test in acceptance.
Because of the structure reason, the female drainage wire of pipe presss from both sides the shape and is equivalent to the pipe that a section was vertically cut open, often has several defects after fastening tightly with the steel bolt:
1) the distribution of the circumferential stress of the tubular bus drainage wire clamp is discontinuous, the holding pressure of the wire clamp hoop and the tubular bus conductor is uncontrollable, the yielding engagement area of the tubular bus drainage wire clamp and the tubular bus conductor is easily insufficient, the contact resistance is overlarge, and the heating is caused;
2) because the anchor ear bolt shoulder of the tubular bus drainage wire clamp extends out of the anchor ear, when the bolt is fastened, the transition part of the anchor ear bolt shoulder and the anchor ear bears great shearing stress, and because crystal grains of materials such as aluminum alloy and the like are large, the anchor ear shoulder of the tubular bus drainage wire clamp is easy to crack, so that the tubular bus drainage wire clamp is broken, and faults are caused;
3) in order to ensure that the anchor ear of the traditional tubular bus drainage wire clamp has enough holding force on a tubular bus conductor, the pre-tightening force of the anchor ear fastening bolt is larger, a steel bolt above 4.8 grade is needed to be used, because the steel bolt is different from the material of the tubular bus drainage wire clamp, the yield strength and the thermal expansion coefficient are far away, after the tubular bus drainage wire clamp runs for a certain time, the fastening part of the tubular bus drainage wire clamp bolt is loosened due to the change of the environmental temperature, the contact resistance between the anchor ear of the tubular bus drainage wire clamp and the tubular bus conductor is increased, the heating is caused, and the fault is caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a pipe bus clamp and a construction method thereof, which aims to solve the problems in the prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a pipe bus clamp, including the last staple bolt that is the same conducting material, staple bolt and wedge down, still include electrically conductive becket, it is provided with the step to go up the staple bolt both sides, the step upper surface is provided with four drawing die grooves, staple bolt both sides upper end is provided with the extension section down, the extension section sets up to handstand L type structure, the inboard is provided with corresponds for your four drawing die faces with four drawing die grooves on the extension section, four drawing die grooves and four drawing die faces form four rectangle wedge grooves respectively, four wedges insert the fixed staple bolt of going up of four rectangle wedge grooves and staple bolt down respectively, the becket axial is provided with the breach, place in the elasticity in the round hole that constitutes between staple bolt and the staple bolt down and encircle the pipe bus conductor.
Preferably, the four wedges are pressed by a puller.
Preferably, after the four wedges are compressed, the upper anchor ear, the lower anchor ear and the embedded ring are fully buckled and meshed with the contact surface of the tubular bus conductor to form a low-resistance current path.
A construction method of a pipe bus clamp comprises the following steps: the pipe bus conductor is wrapped by the embedded ring, the embedded ring is arranged in the lower anchor ear, the upper anchor ear presses the embedded ring, the four wedges are respectively inserted into the four rectangular wedge grooves formed at the two ends of the lower anchor ear and the upper anchor ear, and the four wedges are pressed by the puller, so that the contact surfaces between the upper anchor ear and the embedded ring as well as between the embedded ring and the pipe bus conductor are fully buckled and meshed to form a low-resistance current path.
The length of an anchor ear and an embedding ring formed by the upper anchor ear and the lower anchor ear is required to meet the conductive current-carrying capacity of the semicircular inner interface of the upper anchor ear or the lower anchor ear, and the meshing yield area of the material of the semicircular inner interface of the upper anchor ear or the lower anchor ear is required to be larger than the sectional area of the tubular bus conductor; go up staple bolt or lower staple bolt and the minimum length of caulking ring do:
Figure BDA0002869631770000031
in the formula (1), the reaction mixture is,
lmin-minimum length of upper or lower hoop and insert ring, unit mm;
k- -safety factor, 1.2;
alpha-diameter of the tubular bus conductor in mm;
delta- - -the wall thickness of the tubular bus conductor, unit mm;
go up the staple bolt or staple bolt and thimble length down do:
l＝10lmin。
go up the staple bolt and the radial stress that staple bolt circular arc section needs down when drawing horse ware crimping wedge:
Figure BDA0002869631770000032
in the formula (2), the reaction mixture is,
Pc maxradial stress of the arc segment of the upper anchor ear or the lower anchor ear in unit MPa;
Ri0.2the yield strength of the insert ring in MPa.
The wall thicknesses of the arc sections of the upper hoop and the lower hoop are calculated as follows:
the minimum wall thickness of the arc sections of the upper hoop and the lower hoop is as follows:
Figure BDA0002869631770000033
in the formula (3), the reaction mixture is,
Pc maxradial stress of arc sections of the upper anchor ear and the lower anchor ear in unit MPa;
Di-the inner diameter of the circular arc segment in mm;
δcmincalculating the wall thickness in unit mm by using the circular arc sections of the upper anchor ear and the lower anchor ear;
Rc0.2-the yield strength of the material of the upper and lower hoops, in units of MPa;
the wall thickness of the arc sections of the upper and lower anchor ears is taken as a safety coefficient of 4, and the wall thickness of the arc sections of the upper and lower anchor ears is
δc＝4δcmin (4)
In the formula (4), the reaction mixture is,
δcmincalculating the wall thickness in unit mm by using the circular arc sections of the upper anchor ear and the lower anchor ear;
δcthe wall thickness of the arc sections of the upper anchor ear and the lower anchor ear is unit mm.
The maximum hoop calculation stress of the upper hoop and the lower hoop arc section is as follows:
Figure BDA0002869631770000041
in the formula (5), the reaction mixture is,
Pc maxradial stress of arc sections of the upper anchor ear and the lower anchor ear in unit MPa;
Diinner diameter of the circular arc in mm;
δcthe wall thickness of the arc sections of the upper anchor ear and the lower anchor ear is unit mm;
σc max-maximum hoop calculated stress of the upper and lower hoop arc segments in units of MPa.
Lowest axial pretightening force F of each wedgemin：
Assuming that the wedge is uniformly expanded in the expansion process, the wedge is subjected to five forces, namely a thrust F, a pressure N of the die drawing surface of the upper anchor ear, a friction force F of the die drawing surface of the anchor ear and a pressure N of the die drawing surface of the lower anchor earbFriction force f of die drawing surface of pressing platebAccording to the balance of forces, there are:
F＝f cosβ+N sinβ+fb cosβ+Nb sinβ (7)
f＝μN (8)
fb＝μNb (9)
N cosβ+fb sinβ＝Nb cosβ+f sinβ (10)
wherein, mu- - - -coefficient of friction of the pattern drawing surface;
beta-wedge draft angle, unit °;
the relationship between the axial thrust of the wedge and the pressure of the hoop drawing die surface is obtained by deducting the formulas (7) to (10):
F＝2N(μ cosβ+sinβ) (11)
because each side of the upper anchor ear and the lower anchor ear is compressed by two wedges, the pressure N of each wedge is
Figure BDA0002869631770000051
In the formula (12), the reaction mixture is,
n- -pressure per wedge in N;
Nc min-calculating the pressure in the circumferential direction of the upper and lower hoops in units of N;
beta-wedge draft angle, unit °;
the lowest axial pretightening force of each wedge is
Figure BDA0002869631770000052
In the formula (13), the reaction mixture is,
Nc min-the minimum hoop pressure of the upper and lower hoops, in units of N;
mu- - -hoop drawing die interface friction coefficient;
Fmin-the lowest axial pre-tightening force of the wedge, in N;
beta- - -wedge draft angle, units.
Upper limit axial pretightening force F of each wedgemax：
In order to ensure the safety of the bus and the lower hoop plate, except for meeting the conductive current-carrying capacity of an expansion section, the shear stress of the lower hoop pressing beam cannot be greater than 0.5 time of the yield strength of the hoop material, and then:
Figure BDA0002869631770000053
in the formula (14), l represents the length of the embedded ring in mm;
Rc0.2-the yield strength of the material of the upper or lower hoop in MPa;
t < - > -the actual minimum thickness of the hoop pressing beam in unit mm;
n- -pressure per wedge in N;
beta-wedge draft angle, unit °;
bringing formula (14) into formula (11)
Figure BDA0002869631770000061
In the formula (15), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
Rc0.2-hoop and platen material yield strength in MPa;
t < - > -the actual minimum thickness of the hoop pressing beam in unit mm;
beta-wedge draft angle, unit.
Drawing angle when the wedge is self-locked:
assuming that the wedge is self-locked and stopped in the anchor ear after expansion stopping, the wedge is acted by four forces, namely the pressure N of the drawing die surface of the upper anchor ear, the friction force f of the drawing die surface of the upper anchor ear and the pressure N of the drawing die surface of the lower anchor eariFriction force f of lower hoop drawing die surfaceiThe radial strain of each part (except the thrust direction) caused by the expansion pressure is not changed, and the pressure NiWithout change, i.e.
f＝μN (16)
fi＝μNi (17)
Ni sinβ+N sinβ＝fi cosβ+f cosβ (18)
Mu in formula (17) -coefficient of friction (between the wedge and the upper/lower hoop drawing surfaces);
Ni-the pressure of the drawing surface of the lower hoop, unit N;
fi-friction force of the lower anchor ear die drawing surface, unit N;
because the pressure of the two drawing die surfaces of the wedge is equal, the wedge is required to be self-locked in the connected anchor ear after the expansion is stopped, and the critical condition is that
tgβ≤μ。 (19)
The invention has the beneficial effects that: compared with the prior art, the invention adopts four wedges to lock the upper anchor ear and the lower anchor ear, and under the elastic action of the embedded ring with the axial gap, the connecting device consisting of the upper anchor ear, the lower anchor ear and the embedded ring can generate interference fit with enough area with the tubular bus conductor, thereby reducing the contact resistance; through optimal design, do not use the xenogenesis material as connecting device's load part, avoid connecting device to appear too big stress, guarantee that the device main part is in the elasticity scope, through self-compensation, make connecting device can not appear the not hard up oxidation in gap at termination conductor contact surface behind the cold and hot circulation, improve connecting device's reliability.
Drawings
FIG. 1 is a schematic side view of a tube bus bar clamp;
FIG. 2 is a front view of the tube bus bar clamp;
FIG. 3 is a schematic diagram of the wedge under five forces;
FIG. 4 is a schematic side view of the wedge;
FIG. 5 is a schematic view of the self-locking of the wedge under force;
FIG. 6 is a schematic view of the self-locking side structure of the wedge;
FIG. 7 is a front view of the insert ring;
FIG. 8 is a side view of the insert ring;
FIG. 9 is a schematic view of a three-dimensional structure of the lower hoop;
FIG. 10 is a schematic diagram of a side view structure of the lower hoop;
FIG. 11 is a front view of the lower hoop;
FIG. 12 is a schematic view of the cross-sectional view D-D of FIG. 11;
FIG. 13 is a front view of the upper hoop;
FIG. 14 is a schematic side view of the upper hoop;
FIG. 15 is a schematic side view of the wedge;
FIG. 16 is a schematic view of the front view of the wedge;
FIG. 17 is a perspective view of a tube bus bar clamp;
FIG. 18 is a schematic structural view of an L-shaped spiral female pipe drainage clamp;
fig. 19 is a structural schematic diagram of a Y-crimp tubular female drainage clamp.
Detailed Description
The invention is further described below with reference to specific figures and embodiments.
Example 1: as shown in fig. 1-17, a pipe bus-bar clamp comprises an upper hoop 1 made of the same conductive material, lower staple bolt 2 and wedge 4, still include electrically conductive embedded ring 3, it is provided with the step to go up staple bolt 1 both sides, the step upper surface is provided with four drawing die grooves 6, 2 both sides upper ends of lower staple bolt are provided with the extension section, the extension section sets up to handstand L type structure, the inboard is provided with corresponds four drawing die surfaces 7 for your with four drawing die grooves 6 on the extension section, four drawing die grooves 6 and four drawing die surfaces 7 form four rectangle wedge grooves respectively, four wedge 4 insert four rectangle wedge grooves respectively and fix staple bolt 1 and lower staple bolt 2, 3 axial of embedded ring is provided with breach 8, place in the round hole that constitutes between staple bolt 1 and the lower staple bolt 2 in the elasticity and encircle tub female conductor 5, lower staple bolt 2 downside is provided with the circle guide arm 9 of a body structure, circle guide arm 9 is used for connecting electrically conductive gold utensil or cable.
Preferably, the four wedges 4 are compressed by a puller, the compression is reliable and stable, and the compression stress is balanced.
Preferably, after the four wedges 4 are compressed, the contact surfaces of the upper anchor ear 1, the lower anchor ear 2 and the embedded ring 3 and the tubular bus conductor 5 are fully buckled and meshed, and a low-resistance (the contact resistance is lower than that of an equal-length drainage wire) current path is formed.
Example 2: a construction method of a pipe bus clamp comprises the following steps: the pipe bus conductor is wrapped by the embedded ring, the embedded ring is arranged in the lower anchor ear, the upper anchor ear presses the embedded ring, the four wedges are respectively inserted into the four rectangular wedge grooves formed at the two ends of the lower anchor ear and the upper anchor ear, and the four wedges are pressed by the puller, so that the contact surfaces between the upper anchor ear and the embedded ring as well as between the embedded ring and the pipe bus conductor are fully buckled and meshed to form a low-resistance current path.
The length of an anchor ear and an embedding ring formed by the upper anchor ear and the lower anchor ear is required to meet the conductive current-carrying capacity of the semicircular inner interface of the upper anchor ear or the lower anchor ear, and the meshing yield area of the material of the semicircular inner interface of the upper anchor ear or the lower anchor ear is required to be larger than the sectional area of the tubular bus conductor; the minimum length of the hoop and the embedded ring is as follows:
Figure BDA0002869631770000091
in the formula (1), the reaction mixture is,
lmin-minimum hoop and thimble lengths in mm;
k- -safety factor, 1.2;
alpha-diameter of the tubular bus conductor in mm;
delta- - -the wall thickness of the tubular bus conductor, unit mm;
staple bolt and thimble length do:
l＝10lmin。
go up the staple bolt and the radial stress that staple bolt circular arc section needs down when drawing horse ware crimping wedge:
Figure BDA0002869631770000092
in the formula (2), the reaction mixture is,
Pc maxradial stress of arc section of drawing surface of lower anchor ear in unit of MPa;
Ri0.2the yield strength of the insert ring in MPa.
The wall thicknesses of the arc sections of the upper hoop and the lower hoop are calculated as follows:
the minimum wall thickness of the arc sections of the upper hoop and the lower hoop is as follows:
Figure BDA0002869631770000101
in the formula (3), the reaction mixture is,
Pc maxradial stress of arc sections of the upper anchor ear and the lower anchor ear in unit MPa;
Di-the inner diameter of the circular arc segment in mm;
δcmincalculating the wall thickness in unit mm by using the circular arc sections of the upper anchor ear and the lower anchor ear;
Rc0.2-the yield strength of the material of the upper and lower hoops, in units of MPa;
the wall thickness of the arc sections of the upper and lower anchor ears is taken as a safety coefficient of 4, and the wall thickness of the arc sections of the upper and lower anchor ears is
δc＝4δcmin (4)
In the formula (4), the reaction mixture is,
δcmincalculating the wall thickness in unit mm by using the circular arc sections of the upper anchor ear and the lower anchor ear;
δcthe wall thickness of the arc sections of the upper anchor ear and the lower anchor ear is unit mm.
The maximum hoop calculation stress of the upper hoop and the lower hoop arc section is as follows:
Figure BDA0002869631770000102
in the formula (5), the reaction mixture is,
Pc maxradial stress of arc sections of the upper anchor ear and the lower anchor ear in unit MPa;
Diinner diameter of the circular arc in mm;
δcthe wall thickness of the arc sections of the upper anchor ear and the lower anchor ear is unit mm;
σc max-maximum hoop calculated stress of the upper and lower hoop arc segments in units of MPa.
Lowest axial pretightening force F of each wedgemin：
Assuming that the wedge is uniformly expanded in the expansion process, the wedge is subjected to five forces, namely a thrust F, a pressure N of the die drawing surface of the upper anchor ear, a friction force F of the die drawing surface of the anchor ear and a pressure N of the die drawing surface of the lower anchor earbFriction force f of die drawing surface of pressing platebAccording to the balance of forces, as shown in fig. 3-4, there are:
F＝f cosβ+N sinβ+fb cosβ+Nb sinβ (7)
f＝μN (8)
fb＝μNb (9)
N cosβ+fb sinβ＝Nb cosβ+f sinβ (10)
wherein, mu- - - -coefficient of friction of the drawing surface is shown in Table 1;
beta-wedge draft angle, unit °;
the relationship between the axial thrust of the wedge and the pressure of the hoop drawing die surface is obtained by deducting the formulas (7) to (10):
F＝2N(μ cosβ+sinβ) (11)
TABLE 1 friction factor of machining and drawing die surface
Substances rubbing against each other Coefficient of friction
Brass to brass machined surface 0.12
Machined surface of bronze to bronze 0.07
Machined surface of steel-to-steel machine 0.1
Machined surface of aluminum alloy to aluminum alloy 0.18
Because each side of the upper anchor ear and the lower anchor ear is compressed by two wedges, the pressure N of each wedge is
Figure BDA0002869631770000111
In the formula (12), the reaction mixture is,
n- -pressure per wedge in N;
Nc min-calculating the pressure in the circumferential direction of the upper and lower hoops in units of N;
beta-wedge draft angle, unit °;
the lowest axial pretightening force of each wedge is
Figure BDA0002869631770000112
In the formula (13), the reaction mixture is,
Nc min-the minimum hoop pressure of the upper and lower hoops, in units of N;
mu- - -hoop drawing die interface friction coefficient;
Fmin-the lowest axial pre-tightening force of the wedge, in N;
beta-wedge draft angle, unit.
Upper limit axial pretightening force F of each wedgemax：
In order to ensure the safety of the bus and the lower hoop plate, except for meeting the conductive current-carrying capacity of an expansion section, the shear stress of the lower hoop pressing beam cannot be greater than 0.5 time of the yield strength of the hoop material, and then:
Figure BDA0002869631770000121
in formula (14), l represents the length of the thimble in unit;
Rc0.2-the yield strength of the material of the pattern drawing surface of the lower hoop, unit;
t-actual minimum thickness of the hoop pressing beam;
n- -pressure per wedge in N;
beta- - -wedge draft angle, units;
bringing formula (14) into formula (11)
Figure BDA0002869631770000122
In the formula (15), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
Rc0.2-the yield strength of the material of the pattern drawing surface of the lower hoop in units of MPa;
t < - > -the actual minimum thickness of the hoop pressing beam in unit mm;
beta-wedge draft angle, unit.
Drawing angle when the wedge is self-locked:
assuming that the wedge is self-locked and stopped in the anchor ear after the expansion is stopped, as shown in fig. 5-6, the wedge is acted by four forces, namely the pressure N of the drawing die surface of the upper anchor ear, the friction force f of the drawing die surface of the upper anchor ear and the pressure N of the drawing die surface of the lower anchor eariFriction force f of lower hoop drawing die surfaceiThe radial strain of each part (except the thrust direction) caused by the expansion pressure is not changed, and the pressure NiWithout change, i.e.
f＝μN (16)
fi＝μNi (17)
Ni sinβ+N sinβ＝fi cosβ+f cosβ (18)
Mu- - - -coefficient of friction in formula (17);
Ni-the pressure of the drawing surface of the lower hoop, unit N;
fi-friction force of the lower anchor ear die drawing surface, unit N;
because the pressure of the two drawing die surfaces of the wedge is equal, the wedge is required to be self-locked in the connected anchor ear after the expansion is stopped, and the critical condition is that
tgβ≤μ。 (19)
From the formula (19), the self-locking of the wedge is related to the friction coefficient of the contact material and the drawing angle, and is unrelated to the axial pre-tightening force of the wedge. Through calculation and experimental verification, the self-locking half-cone angle of the brass, bronze, steel and aluminum alloy common metal self-locking cone ring is shown in the table 2.
TABLE 2 self-locking die-drawing angle of several metal wedges
Substances rubbing against each other Friction factor of machined surface Self-locking drawing angle
Brass to brass machined surface 0.12 ≦6.84
Machined surface of bronze to bronze 0.07 ≦4.0
Machined surface of steel-to-steel machine 0.1 ≦5.71
Machined surface of aluminum alloy to aluminum alloy 0.18 ≦10.20
The structure of the embedded ring is as follows: the embedded ring is processed by soft pure metal with similar material of the tubular female binding post, and can also directly use a soft aluminum strip. Aluminum alloy designation 1A99, yield strength R0.2Not higher than 45 MPa.
Typical design parameters for the insert ring are shown in table 3 and figures 7-8.
TABLE 3 exemplary Structure of the insert Ring
Figure BDA0002869631770000141
Staple bolt structural feature down: the lower anchor ear is made of hard alloy close to the material of the tubular bus conductor. The aluminum alloy is 5A05, and the yield strength is not lower than 115 MPa.
The anchor ear is a round same-set rectangular wedge pressing structure; each parameter of the hoop depends on the diameter alpha of the tubular main conductor and the draft angle beta of the hoop draft plane, a typical design calculation formula is (length unit is mm, and part of parameters are shown in table 4), and the following relationships are provided according to the variables in fig. 9-12:
Figure BDA0002869631770000142
Figure BDA0002869631770000143
Figure BDA0002869631770000144
Figure BDA0002869631770000145
Figure BDA0002869631770000146
H1＝H2+2δc
b1 depends on the current carrying capacity of the drainage wire.
Table 4, lower hoop structure size:
Figure BDA0002869631770000151
go up staple bolt structural feature: the upper anchor ear is processed by hard alloy with the material of the tubular bus conductor close to that of the tubular bus conductor. The aluminum alloy designation is 5a05, the yield strength is not lower than 115Mpa, the upper anchor ear is of a semicircular wedge pressing structure, as shown in fig. 13-14, each parameter of the upper anchor ear depends on the diameter a of the tubular bus conductor and the die drawing surface drawing angle β of the pressing plate, and a typical design calculation formula is as follows (the length units are mm, and part of the parameters are shown in table 5):
Figure BDA0002869631770000152
Figure BDA0002869631770000153
Figure BDA0002869631770000154
Figure BDA0002869631770000155
Figure BDA0002869631770000156
table 5, go up staple bolt structure size:
Figure BDA0002869631770000157
Figure BDA0002869631770000161
the structural characteristics of the wedge are as follows: the wedge is processed by hard alloy with the material of the tubular bus conductor being close to that of the tubular bus conductor. An aluminum alloy designation 5a05, yield strength not lower than 115MPa, as shown in fig. 15-16, a bottom end side of a wedge through hole diameter P2 is a puller bolt hole, parameters of the wedge depend on a pipe bus conductor diameter a and a pressing plate drawing surface drawing angle β, and a typical design calculation formula is (length unit is mm, and some parameters are shown in table 6):
Figure BDA0002869631770000162
T2＝1.5δc+0.5
table 6, cleat structure size:
Figure BDA0002869631770000163
the above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.

Claims (10)

1. A tube bus-bar clamp is characterized in that: including last staple bolt (1) that is the same conducting material, staple bolt (2) and wedge (4) down, still include electrically conductive embedded ring (3), it is provided with the step to go up staple bolt (1) both sides, the step upper surface is provided with four drawing die grooves (6), staple bolt (2) both sides upper end is provided with the extension section down, the extension section sets up to handstand L type structure, the inboard is provided with four drawing die surfaces (7) for you with four drawing die grooves (6) correspondence on the extension section, four drawing die grooves (6) and four drawing die surfaces (7) form four rectangle wedge grooves respectively, four wedge (4) insert respectively four rectangle wedge grooves and fix staple bolt (1) and staple bolt (2) down, embedded ring (3) axial is provided with breach (8), place in the round hole that constitutes between staple bolt (1) and staple bolt (2) down in the elasticity and encircle tub female conductor (5).
2. The pipe bus clamp of claim 1, wherein: after the four wedges (4) are pressed, the contact surfaces of the upper anchor ear (1), the lower anchor ear (2) and the embedded ring (3) and the tubular bus conductor (5) are ensured to be in yielding engagement, so that a low-resistance current path is formed.
3. The construction method of a pipe bus-bar clamp according to any one of claims 1 to 2, wherein: the method comprises the following steps: the pipe bus conductor is wrapped by the embedded ring, the embedded ring is arranged in the lower anchor ear, the upper anchor ear presses the embedded ring, the four wedges are respectively inserted into the four rectangular wedge grooves formed at the two ends of the lower anchor ear and the upper anchor ear, and the four wedges are pressed by the puller, so that the contact surfaces between the upper anchor ear and the embedded ring as well as between the embedded ring and the pipe bus conductor are in yielding engagement.
4. The construction method of the pipe bus clamp according to claim 3, wherein: the length of an anchor ear and an embedding ring formed by the upper anchor ear and the lower anchor ear is required to meet the conductive current-carrying capacity of the semicircular inner interface of the upper anchor ear or the lower anchor ear, and the meshing yield area of the material of the semicircular inner interface of the upper anchor ear or the lower anchor ear is required to be larger than the sectional area of the tubular bus conductor; go up staple bolt or lower staple bolt and the minimum length of caulking ring do:
Figure FDA0002869631760000021
in the formula (1), the reaction mixture is,
lmin-minimum length of upper or lower hoop and insert ring, unit mm;
k- -safety factor, 1.2;
alpha-diameter of the tubular bus conductor in mm;
delta- - -the wall thickness of the tubular bus conductor, unit mm;
staple bolt and thimble length do:
l＝10lmin。
5. the construction method of the pipe bus clamp according to claim 3, wherein: go up the staple bolt and the radial stress that staple bolt circular arc section needs down when drawing horse ware crimping wedge:
Figure FDA0002869631760000022
in the formula (2), the reaction mixture is,
Pcmaxradial stress of arc sections of the upper anchor ear or the lower anchor ear and the pressing plate in unit MPa;
Ri0.2the yield strength of the insert ring in MPa.
6. The construction method of the pipe bus clamp according to claim 3, wherein: the wall thicknesses of the arc sections of the upper hoop and the lower hoop are calculated as follows:
the minimum wall thickness of the arc sections of the upper hoop and the lower hoop is as follows:
Figure FDA0002869631760000023
in the formula (3), the reaction mixture is,
Pcmaxradial stress of arc sections of the upper anchor ear and the lower anchor ear in unit MPa;
Di-the inner diameter of the circular arc segment in mm;
δcmincalculating the wall thickness in unit mm by using the circular arc sections of the upper anchor ear and the lower anchor ear;
Rc0.2-the yield strength of the material of the upper and lower hoops, in units of MPa;
the wall thickness of the arc sections of the upper and lower anchor ears is taken as a safety coefficient of 4, and the wall thickness of the arc sections of the upper and lower anchor ears is
δc＝4δcmin (4)
In the formula (4), the reaction mixture is,
δcmincalculating the wall thickness in unit mm by using the circular arc sections of the upper anchor ear and the lower anchor ear;
δcthe wall thickness of the arc sections of the upper anchor ear and the lower anchor ear is unit mm.
7. The construction method of the pipe bus clamp according to claim 3, wherein: the maximum hoop calculation stress of the upper hoop and the lower hoop arc section is as follows:
Figure FDA0002869631760000031
in the formula (5), the reaction mixture is,
Pcmaxradial stress of arc sections of the upper anchor ear and the lower anchor ear in unit MPa;
Diinner diameter of the circular arc in mm;
δcthe wall thickness of the arc sections of the upper anchor ear and the lower anchor ear is unit mm;
σcmax-maximum hoop calculated stress of the upper and lower hoop arc segments in units of MPa.
8. The construction method of the pipe bus clamp according to claim 3, wherein: lowest axial pretightening force F of each wedgemin：
Assuming that the wedge is uniformly expanded in the expansion process, the wedge is subjected to five forces, namely a thrust force F, a pressure N of the die drawing surface of the upper anchor ear, a friction force F of the die drawing surface of the upper anchor ear and a pressure N of the die drawing surface of the lower anchor earbFriction force f of die drawing surface of pressing platebAccording to the balance of forces, there are:
F＝fcosβ+Nsinβ+fbcosβ+Nbsinβ (7)
f＝μN (8)
fb＝μNb (9)
Ncosβ+fbsinβ＝Nbcosβ+fsinβ (10)
wherein, mu- - - -coefficient of friction of the pattern drawing surface;
beta-wedge draft angle, unit °;
the relationship between the axial thrust of the wedge and the pressure of the lower anchor ear drawing die surface is obtained by deduction of formulas (7) to (10):
F＝2N(μcosβ+sinβ) (11)
because each side of the upper anchor ear and the lower anchor ear is compressed by two wedges, the pressure N of each wedge is
Figure FDA0002869631760000041
In the formula (12), the reaction mixture is,
n- -pressure per wedge in N;
Ncmin-calculating the pressure in the circumferential direction of the upper and lower hoops in units of N;
beta-wedge draft angle, unit °;
the lowest axial pretightening force of each wedge is
Figure FDA0002869631760000042
In the formula (13), the reaction mixture is,
Ncmin-the minimum hoop pressure of the upper and lower hoops, in units of N;
mu- - -the friction coefficient of the upper anchor ear and the lower anchor ear pattern drawing interface;
Fmin-the lowest axial pre-tightening force of the wedge, in N;
beta-wedge draft angle, unit.
9. The construction method of the pipe bus clamp according to claim 8, wherein: upper limit axial pretightening force F of each wedgemax：
The lower hoop compression beam shear stress cannot be greater than 0.5 times of the yield strength of the lower hoop material, and then:
Figure FDA0002869631760000051
in the formula (14), l represents the length of the embedded ring in mm;
Rc0.2-the yield strength of the material of the lower and upper anchor ear in MPa;
t < - > -the actual minimum thickness of the lower hoop pressing beam in unit mm;
n- -pressure per wedge in N;
beta-wedge draft angle, unit °;
bringing formula (14) into formula (11)
Figure FDA0002869631760000052
In the formula (15), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
Rc0.2-lower and upper hoop materialsYield strength in MPa;
t < - > -the actual minimum thickness of the hoop pressing beam in unit mm;
beta-wedge draft angle, unit.
10. The construction method of the pipe bus clamp according to claim 3, wherein: drawing angle when the wedge is self-locked:
assuming that the wedge is self-locked and stopped in the anchor ear after expansion stopping, the wedge is acted by four forces, namely the pressure N of the drawing die surface of the upper anchor ear, the friction force f of the drawing die surface of the upper anchor ear and the pressure N of the drawing die surface of the lower anchor eariFriction force f of lower hoop drawing die surfaceiThe radial strain of each part caused by the expansion pressure is not changed, and the pressure NiWithout change, i.e.
f＝μN (16)
fi＝μNi (17)
Nisinβ+Nsinβ＝ficosβ+fcosβ (18)
Mu- - - -coefficient of friction in formula (17);
Ni-the pressure of the drawing surface of the lower hoop, unit N;
fi-friction force of the lower anchor ear die drawing surface, unit N;
because the pressure of the two drawing die surfaces of the wedge is equal, the wedge is self-locked in the hoop formed by the upper hoop and the lower hoop after expansion is stopped, and the critical condition is that
tgβ≤μ。 (19)。
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106504873A (en) * 2016-12-01 2017-03-15 保定天威保变电气股份有限公司 A kind of extra-high voltage conduit connection column reinforcing method and device
CN110445061A (en) * 2019-08-08 2019-11-12 贵州电网有限责任公司 A kind of 19 embedding aluminium strain clamp compression bonding methods of strand steel-cored aluminium strand
CN111009747A (en) * 2019-07-29 2020-04-14 桂林市节清科技有限公司 Annormal wire clip
CN111181109A (en) * 2020-03-10 2020-05-19 云南电网有限责任公司 Bolt-free wedge-shaped strain clamp
CN211295401U (en) * 2019-11-20 2020-08-18 国网江西省电力有限公司检修分公司 Auxiliary flow guide fitting for tubular bus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106504873A (en) * 2016-12-01 2017-03-15 保定天威保变电气股份有限公司 A kind of extra-high voltage conduit connection column reinforcing method and device
CN111009747A (en) * 2019-07-29 2020-04-14 桂林市节清科技有限公司 Annormal wire clip
CN110445061A (en) * 2019-08-08 2019-11-12 贵州电网有限责任公司 A kind of 19 embedding aluminium strain clamp compression bonding methods of strand steel-cored aluminium strand
CN211295401U (en) * 2019-11-20 2020-08-18 国网江西省电力有限公司检修分公司 Auxiliary flow guide fitting for tubular bus
CN111181109A (en) * 2020-03-10 2020-05-19 云南电网有限责任公司 Bolt-free wedge-shaped strain clamp

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