CN113054453A - Coaxial drainage device for tubular bus round bar conductor and construction method thereof - Google Patents

Coaxial drainage device for tubular bus round bar conductor and construction method thereof Download PDF

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Publication number
CN113054453A
CN113054453A CN202011597936.9A CN202011597936A CN113054453A CN 113054453 A CN113054453 A CN 113054453A CN 202011597936 A CN202011597936 A CN 202011597936A CN 113054453 A CN113054453 A CN 113054453A
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wedge
conductor
hoop
round bar
anchor ear
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CN113054453B (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
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/60—Connections between or with tubular conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut

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  • Multi-Conductor Connections (AREA)

Abstract

The invention discloses a tubular bus round bar conductor coaxial drainage device and a construction method thereof. The connection structure of the tubular bus conductor is realized by adopting the tubular bus clamp, the coaxial connection structure of the round rod conductor is realized by the coaxial round rod conductor wedge self-locking tension connector, the connection part of the tubular bus clamp and the tubular bus conductor and the connection part of the tubular bus clamp and the coaxial round rod conductor wedge self-locking tension connector can reduce contact resistance and stress, and the contact surface of the conductor of the wiring device can not be subjected to gap loosening oxidation after cold and hot circulation, so that the reliability of the connection device is improved.

Description

Coaxial drainage device for tubular bus round bar conductor and construction method thereof
Technical Field
The invention belongs to the technical field of coaxial round bar conductor connecting hardware fittings, and particularly relates to a tubular bus round bar conductor coaxial drainage device 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 their common characteristics of structure 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-guiding wiring board or a current-guiding crimping pipe on the lower semicircular hoop guides 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 cable clamp is fastened by a bolt, bears pre-tightening stress and has certain requirements on the mechanical property of alloy, but the cable clamp is an accessory part of matched equipment, and the cable clamp generally meets the requirements after passing a temperature rise test in acceptance.
Because of the structure reason, the female drainage wire clamp of pipe shape is equivalent to a section of pipe of vertically cutting open, often has several defects after fastening 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 yield meshing 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 shear 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 conventional anchor ear of the tubular bus drainage wire clamp has enough holding force on the tubular bus conductor, the pre-tightening force of the anchor ear fastening bolt is larger, a steel bolt above 4.8 grade is required 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.
The traditional pole holding wire clamp is also called as a hoop wire clamp, a pile head holding pole and a screw terminal wire clamp (see DL/T765.3), is used for connecting a transformer, a pole switch and the like with a lead and other equipment, has higher requirement on current carrying capacity due to the main function of transmitting current, and is made of copper and copper alloy. 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 is an accessory part of matched equipment and generally meets the requirements after passing a temperature rise test in acceptance.
For structural reasons, the shape of a pole clamp is equivalent to a section of longitudinally split pipe, and after being fastened by steel bolts, the pole clamp often has defects in several aspects:
1) the hoop stress distribution of the pole holding wire clamp hoop is discontinuous, the holding pressure of the pole holding wire clamp hoop and the round rod conductor is uncontrollable, the yield meshing area of the pole holding wire clamp hoop and the round rod conductor is easily insufficient, the contact resistance is too large, the heating is caused, and the fault of high-voltage electrical equipment is caused;
2) because the anchor ear bolt shoulder of the pole holding 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 the crystal grains of materials such as brass and the like are thick, the anchor ear shoulder of the pole holding wire clamp is easy to crack, so that the pole holding wire clamp is broken, and the high-voltage electrical equipment is in failure;
3) in order to guarantee that the traditional pole-holding wire clamp hoop has sufficient holding force to the round-pole conductor, the pre-tightening force ratio of the hoop fastening bolt is larger, a steel bolt above 4.8 level must be used, because the steel bolt is different from the pole-holding wire clamp material, the yield strength and the thermal expansion coefficient are far away, the pole-holding wire clamp runs after a certain time, because of the change of the environmental temperature, the bolt fastening part of the pole-holding wire clamp is not flexible, the contact resistance between the hoop of the pole-holding wire clamp and the round-pole conductor is increased, the heating is caused, and the fault of high-voltage electrical equipment is caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the coaxial drainage device for the tubular bus round rod conductor and the construction method thereof are provided to solve the problems in the prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a coaxial drainage device of tubular busbar round bar conductor, includes tubular busbar clamp and coaxial round bar conductor wedge auto-lock tension connector, and tubular busbar clamp upper end fixed connection is on tubular busbar conductor, and the round bar conductor that the lower extreme set up is one fixed connection at coaxial round bar conductor wedge auto-lock tension connector upper end, and coaxial round bar conductor wedge auto-lock tension connector lower extreme fixed connection round bar conductor two.
The pipe bus clamp comprises an upper hoop made of the same conductive materials, a lower hoop and a first wedge, and further comprises a first conductive embedded ring, steps are arranged on two sides of the upper hoop, the upper surface of each step is provided with a first four die drawing grooves, an extension section is arranged at the upper end of each of two sides of the lower hoop, the extension section is arranged in an inverted L-shaped structure, a first four die drawing surfaces corresponding to the four die drawing grooves are arranged on the upper inner side of the 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, a first gap is formed in an embedded ring shaft, and a pipe bus conductor is arranged in a round hole formed between the upper hoop and the lower hoop in elasticity.
The coaxial round bar conductor wedge self-locking tension connector comprises a hoop II, a pressing plate and a wedge II, wherein the hoop II is made of the same conductive material, the pressing plate and the wedge II further comprise conductive embedded rings II, the hoop II is of a strip-shaped structure, a square through hole is formed in the length direction, a semi-circular-arc through groove I is formed in the middle of the bottom side of the square through hole, the pressing plate is arranged in the square through hole, a semi-circular-arc through groove II is formed in the middle of the bottom side of the square through hole, steps are arranged on two sides of the pressing plate, four drawing die surfaces II corresponding to the four drawing die surfaces II are arranged on the upper side of two ends in the square through hole, the four drawing die surfaces II and the four drawing die grooves II form four rectangular wedge grooves II respectively, the wedge II is four and is inserted into the two ends of a round hole formed between the hoop II and the pressing plate respectively, and the two embedded rings wrap the round bar conductor I and the round bar conductor II respectively.
Preferably, each second wedge is penetrated into the corresponding second wedge along the length direction of the second wedge by an assembly screw and is fastened on the side surface of the inner end of the second drawing groove on the second hoop; a U-shaped notch is transversely formed in the middle of the upper side of the hoop II; and the middle part of the pressure plate and the second hoop are positioned by positioning set screws.
A construction method of a tubular bus round bar conductor coaxial drainage device comprises the following steps: the method comprises a method for installing a pipe bus clamp and a method for installing a coaxial round rod conductor wedge self-locking tension connector, wherein the method for installing the pipe bus clamp comprises the following steps: installing a first round rod conductor of a tubular bus clamp on the upper end of a coaxial round rod conductor wedge self-locking tension connector, wrapping the tubular bus conductor by an embedded ring I, installing the embedded ring I into a lower anchor ear, pressing the embedded ring I by an upper anchor ear, inserting the four wedge I into four rectangular wedge grooves formed at two ends of the lower anchor ear and the upper anchor ear respectively, and pressing the four wedge I by a puller so that contact surfaces between the upper anchor ear and the embedded ring I as well as between the embedded ring I and the tubular bus conductor are fully buckled and meshed to form a low-resistance current path; the installation method of the coaxial round rod conductor wedge self-locking tension connector comprises the following steps: the pressing plate penetrates into the hoop II, a positioning set screw is installed to form a round bar conductor connector, four die drawing grooves of the hoop II and four die drawing surfaces of the pressing plate jointly form two rectangular wedge grooves at the upper end and the lower end of the round bar conductor connector, a round bar conductor I of the pipe bus clamp penetrates into an embedded ring II, the embedded ring II penetrates into the upper end of the round bar conductor connector, and the round bar conductor I is rotated to enable the round bar conductor I and the embedded ring II to be clamped in the round bar conductor connector; the round bar conductor II penetrates into the other embedded ring II, the embedded ring II penetrates into the lower end of the round bar conductor connector, the round bar conductor II is rotated to enable the round bar conductor II and the embedded ring II to be clamped in the round bar conductor connector, the two wedges II are inserted into the two rectangular wedge grooves at one end of the round bar conductor connector, and two assembling screws respectively penetrate into screw holes at the bottoms of the two drawing grooves on the wedges II and the two hoops II to be tensioned, so that the pressing plate compresses the embedded ring II; and inserting the two wedges II into the two rectangular wedge grooves II at the other end of the round bar conductor connector, and respectively penetrating the two wedges II and the screw holes at the bottoms of the drawing grooves II on the anchor ear II by using two assembling screws for tensioning so as to enable the pressing plate to tightly press the embedded ring II.
The invention has the beneficial effects that: compared with the prior art, the invention provides a brand-new high-voltage electrical equipment round bar conductor connecting device aiming at a drainage wire round bar wiring terminal connecting structure for drainage of equipment such as a transformer substation tubular bus directional breaker, an isolating switch, a lightning arrester, a current transformer, a voltage transformer, a transformer and the like, so that the connecting device and the round bar conductor can generate interference fit with enough area, a tubular bus clamp is adopted to realize the connection of the tubular bus conductor, a coaxial round bar conductor wedge self-locking tension connector is adopted to realize a round bar conductor coaxial connection structure, and the contact resistance is reduced at the connection part of the tubular bus clamp and the tubular bus conductor and the connection part of the tubular bus clamp and the coaxial round bar conductor wedge self-locking tension connector; the connecting device has the advantages that heterogeneous materials are not used as a bearing part of the connecting device, excessive stress of the connecting device is avoided, the main body of the connecting device is ensured to be in an elastic range, and through self-compensation, the conductor contact surface of the connecting device after cold and hot circulation cannot be subjected to gap loosening oxidation, so that the reliability of the connecting device is improved.
Drawings
FIG. 1 is a schematic top view of a coaxial round bar conductor wedge self-locking tension connector;
FIG. 2 is a front view of the coaxial round bar conductor wedge self-locking tension connector;
FIG. 3 is a left side view schematic diagram of a coaxial round bar conductor wedge self-locking tension connector;
FIG. 4 is a schematic diagram of a wedge subjected to five forces;
FIG. 5 is a schematic side view of the wedge;
FIG. 6 is a schematic view of the self-locking of the wedge under force;
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 hoop;
FIG. 10 is a schematic view of the bottom view of the hoop;
FIG. 11 is a front view of the hoop;
FIG. 12 is a schematic view of a top view of the hoop;
FIG. 13 is a schematic sectional view taken along line A-A in FIG. 10;
FIG. 14 is a schematic cross-sectional view of D-D of FIG. 13;
FIG. 15 is a left side view of the hoop;
FIG. 16 is a schematic cross-sectional view of B-B of FIG. 12;
FIG. 17 is a bottom view of the pressure plate;
FIG. 18 is a front view of the platen;
FIG. 19 is a left side view of the pressing plate;
FIG. 20 is a schematic sectional view taken along line A-A in FIG. 19;
FIG. 21 is a schematic cross-sectional view of B-B of FIG. 18;
FIG. 22 is a schematic side view of the wedge;
FIG. 23 is a schematic structural view of the front end face of the wedge;
FIG. 24 is a schematic view of the rear end face structure of the wedge;
FIG. 25 is a schematic perspective view of a coaxial round bar conductor wedge self-locking tension connector;
FIG. 26 is a front view of the round bar conductor;
FIG. 27 is a schematic bottom view of the round bar conductor;
FIG. 28 is a side view of the tube bus bar clamp;
FIG. 29 is a front view of the tube bus bar clamp;
FIG. 30 is a schematic view of a wedge subjected to five forces;
FIG. 31 is a schematic side view of the wedge;
FIG. 32 is a schematic view of the wedge under self-locking force;
FIG. 33 is a front view of the insert ring;
FIG. 34 is a side view of the insert ring;
FIG. 35 is a schematic view of a three-dimensional structure of the lower hoop;
FIG. 36 is a schematic side view of the lower hoop;
FIG. 37 is a front view of the lower hoop;
FIG. 38 is a schematic view of the cross-sectional view D-D of FIG. 37;
FIG. 39 is a front view of the upper hoop;
FIG. 40 is a schematic diagram of a side view structure of the upper hoop;
FIG. 41 is a schematic side view of the wedge;
FIG. 42 is a schematic view of the front view of the wedge;
FIG. 43 is a schematic perspective view of a tube bus-bar clamp
Fig. 44 is a schematic view of the coaxial drainage device of the tubular busbar round rod conductor.
Detailed Description
The invention is further described below with reference to specific figures and embodiments.
Example 1: as shown in fig. 1-44, a coaxial drainage device for tubular busbar and round bar conductor comprises a tubular busbar clamp 1 and a coaxial round bar conductor wedge self-locking tension connector 2, wherein the upper end of the tubular busbar clamp 1 is fixedly connected to a tubular busbar conductor 105, a round bar conductor I3 arranged at the lower end of the tubular busbar clamp is fixedly connected to the upper end of the coaxial round bar conductor wedge self-locking tension connector 2, and a round bar conductor II 206 is fixedly connected to the lower end of the coaxial round bar conductor wedge self-locking tension connector 2.
The pipe bus clamp 1 comprises an upper anchor ear 101, a lower anchor ear 102, a first wedge 104 and a first conductive embedded ring 103, wherein the upper anchor ear 101, the lower anchor ear 102 and the first wedge 104 are made of the same conductive materials, the first conductive embedded ring 103 is further comprised, steps are arranged on two sides of the upper anchor ear 101, four die drawing grooves I106 are arranged on the upper surfaces of the steps, extension sections are arranged at the upper ends of two sides of the lower anchor ear 102 and are arranged in an inverted L-shaped structure, four die drawing surfaces I107 corresponding to the four die drawing grooves I106 are arranged on the upper inner side of the extension sections, four rectangular wedge grooves are respectively formed in the four die drawing grooves I106 and the four die drawing surfaces I107, the four wedge grooves I104 are respectively inserted into the four rectangular wedge grooves to fix the upper anchor ear 101 and the lower anchor ear 102, a first gap 108 is axially arranged on the first embedded ring 103, and is elastically arranged in; the four wedges I104 are pressed tightly by a puller; after the four wedges I104 are pressed, the contact surfaces of the upper anchor ear 101, the lower anchor ear 102 and the embedded ring I103 and the tubular bus conductor 105 are ensured to be fully buckled and meshed to form a low-resistance current path, the upper anchor ear and the lower anchor ear are locked by the four wedges, and a connecting device formed by the upper anchor ear, the lower anchor ear and the embedded ring can generate interference fit with a sufficient area with the tubular bus conductor under the elastic action of the embedded ring with an axial gap, so that the contact resistance is reduced; through optimal design, the load-bearing part of the connecting device is not made of dissimilar materials, excessive stress of the connecting device is avoided, the main body of the connecting device is ensured to be in an elastic range, and through self-compensation, the conductor contact surface of the connecting device after cold and hot circulation is free from gap loosening and oxidation, so that the reliability of the connecting device is improved.
The coaxial round bar conductor wedge self-locking tension connector 2 comprises a hoop II 201, a pressing plate 202 and a wedge II 204 which are made of the same conductive materials, and further comprises a conductive embedded ring II 203, wherein the hoop II 201 is of a strip structure, a square through hole 208 is formed in the length direction, a semi-circular through groove I209 is formed in the middle of the bottom side of the square through hole 208 in the length direction, the pressing plate 202 is arranged in the square through hole 208, a semi-circular through groove II 212 is formed in the middle of the bottom side of the length direction, steps are arranged on two sides of the pressing plate 202, four symmetrical die drawing surfaces II 213 are arranged on the upper surface of each step, four die drawing grooves II 14 corresponding to the four die drawing surfaces II 213 are arranged on the upper side of two ends in the square through hole 208, the four die drawing surfaces II 213 and the four die drawing grooves II 214 respectively form four rectangular wedge grooves, the wedge II 204 is four, the four wedges are respectively inserted into the four rectangular wedge grooves to fix the hoop, the two round bar conductors are respectively and elastically arranged in the two ends of the round hole formed between the hoop II 201 and the pressing plate 202 and respectively surround the round bar conductor I3 and the round bar conductor II 206, so that the coaxial connection of the two round bar conductors can be realized, and a brand new high-voltage electrical equipment round bar conductor connecting device is provided, so that the connecting device and the round bar conductor can generate interference fit with enough area, and the contact resistance is reduced; the connecting device has the advantages that heterogeneous materials are not used as a bearing part of the connecting device, excessive stress of the connecting device is avoided, the main body of the connecting device is ensured to be in an elastic range, and through self-compensation, the conductor contact surface of the connecting device after cold and hot circulation cannot be subjected to gap loosening oxidation, so that the reliability of the connecting device is improved.
Preferably, each second wedge 204 is fastened on the threaded hole 216 of the inner end connecting plate 215 of the second pattern drawing groove 214 on the second hoop 201 by penetrating the assembly screw 205 along the length direction of the second wedge 204; a U-shaped notch 207 is transversely formed in the middle of the upper side of the hoop 201; and the middle part of the pressure plate 202 and the second hoop 201 are positioned by a positioning set screw 211.
Example 2: a construction method of a coaxial drainage device of a tubular busbar round rod conductor comprises a mounting method of a tubular busbar clamp and a mounting method of a coaxial round rod conductor wedge self-locking tension connector.
Example 3: the installation method of the pipe bus clamp comprises the following steps: the method comprises the steps of installing a first round rod conductor of a tubular bus clamp on the upper end of a coaxial round rod conductor wedge self-locking tension connector, wrapping the tubular bus conductor with a first embedded ring in a surrounding mode, installing the first embedded ring into a lower anchor ear, pressing the first embedded ring by an upper anchor ear, inserting the four first wedges into four rectangular wedge grooves formed in two ends of the lower anchor ear and the upper anchor ear respectively, and pressing the four first wedges by a puller so that contact surfaces between the upper anchor ear and the first embedded ring as well as between the first embedded ring and the tubular bus conductor are fully subjected to yielding meshing 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 and embrace hoop, lower staple bolt and inlay the minimum length of ring and be:
Figure BDA0002868278580000051
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 staple bolt, lower staple bolt and thimble length and do:
l＝10lmin。
the puller crimping wedge is temporarily put up the hoop and the radial stress that hoop circular arc section needs down:
Figure BDA0002868278580000052
in the formula (2), the reaction mixture is,
Pcmaxradial stress of the arc segment of the upper anchor ear or the lower anchor ear in unit MPa;
Ri0.2the insert ring-yield strength 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 BDA0002868278580000053
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.
The maximum hoop calculation stress of the upper hoop and the lower hoop arc section is as follows:
Figure BDA0002868278580000061
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.
A lowest axial pre-tightening force F of each wedgemin：
Assuming that the first wedge is uniformly expanded in the expansion process, the first wedge is subjected to five forces, namely a thrust force F, a pressure N of the upper anchor ear die drawing surface, a friction force F of the upper anchor ear die drawing surface and a pressure N of the lower anchor ear die drawing surfacebFriction force f of lower hoop drawing die surfacebFrom the balance of forces, as shown in fig. 30-31, there are:
F＝fcosβ+Nsinβ+fb cosβ+Nb sinβ (7)
f＝μN (8)
fb＝μNb (9)
Ncosβ+fb sinβ＝Nb cosβ+fsinβ (10)
wherein, mu- - - -coefficient of friction of the drawing surface is shown in Table 1;
beta-a wedge-draft angle, in units of degrees;
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(μcosβ+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 I, the pressure N of each wedge is
Figure BDA0002868278580000071
In the formula (12), the reaction mixture is,
n- -one pressure per wedge in N;
Ncmin-calculating the pressure in the circumferential direction of the upper and lower hoops in units of N;
beta-a wedge-draft angle, in units of degrees;
a minimum axial pretension per wedge of
Figure BDA0002868278580000072
In the formula (13), the reaction mixture is,
Ncmin-the minimum hoop pressure of the upper and lower hoops, in units of N;
mu- - -hoop drawing die surface friction coefficient;
Fmin-a minimum axial pre-tightening force of the wedge in units N;
beta-a wedge-draft angle, unit.
An 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 BDA0002868278580000073
in the formula (14), l represents the length of the embedding 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- -one pressure per wedge in N;
beta-wedge draft angle, unit °;
bringing formula (14) into formula (11)
Figure BDA0002868278580000074
In the formula (15), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
Rc0.2-hoop material yield strength in MPa;
t < - > -the actual minimum thickness of the hoop pressing beam in unit mm;
beta-a wedge-draft angle in units.
A first wedge self-locking time pattern drawing angle:
assuming that the wedge is self-locked in the anchor ear after the expansion is stopped, as shown in fig. 32, 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+Nsinβ＝ficosβ+fcosβ (18)
Mu in formula (17) -coefficient of friction (between the first wedge and the upper/lower hoop drawing die surface);
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 first drawing die surface and the second drawing die surface of the wedge is equal, the first drawing die surface and the second drawing die surface of the wedge are self-locked in the connected anchor ear after the expansion is stopped, and the critical condition is that
tgβ≤μ。 (19)
As can be seen from the formula (19), the self-locking of the wedge is related to the friction coefficient and the draft angle of the contact material and is independent of 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 angle of several kinds of 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 first structure of the embedded ring: the embedded ring I is processed by soft pure metal with similar material of the tubular bus terminal, and can also be directly made of soft aluminum strips. Aluminum alloy designation 1A99, yield strength R0.2Not higher than 45 MPa.
A typical design parameter for the insert ring is shown in table 3 and figures 33-34.
TABLE 3 exemplary Structure of insert ring
Figure BDA0002868278580000081
Figure BDA0002868278580000091
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 lower anchor ear is a round and same-set rectangular wedge pressing structure; each parameter of the hoop depends on the diameter alpha of the tubular main conductor and the hoop draft plane draft angle beta, a typical design calculation formula is (length unit is mm, and part of parameters are shown in table 4), and the following relationship exists according to variables in fig. 33-38:
Figure BDA0002868278580000092
Figure BDA0002868278580000093
Figure BDA0002868278580000094
Figure BDA0002868278580000095
Figure BDA0002868278580000096
H1＝H2+2δc
b1 depends on the current carrying capacity of the drainage wire.
Table 4, lower hoop structure size:
Figure BDA0002868278580000097
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. 39-40, 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 BDA0002868278580000101
Figure BDA0002868278580000102
Figure BDA0002868278580000103
Figure BDA0002868278580000104
Figure BDA0002868278580000105
table 5, go up staple bolt structure size:
Figure BDA0002868278580000106
a structural characteristic of the wedge is as follows: the wedge I is processed by hard alloy which is made of a pipe bus conductor material. An aluminum alloy designation 5a05, yield strength not lower than 115MPa, as shown in fig. 41-42, a bolt hole is formed at the bottom end side of a wedge through hole diameter P2, parameters of a wedge depend on a pipe busbar conductor diameter a and a pressing plate drawing surface drawing angle β, and a typical design calculation formula is (length unit is mm, some parameters are shown in table 6):
Figure BDA0002868278580000107
T2＝1.5δc+0.5
table 6, wedge structure size:
Figure BDA0002868278580000108
Figure BDA0002868278580000111
example 4: the installation method of the coaxial round bar conductor wedge self-locking tension connector comprises the following steps: the pressing plate penetrates into the hoop II, a positioning set screw is installed to form a round bar conductor connector, four die drawing grooves of the hoop II and four die drawing surfaces of the pressing plate jointly form two rectangular wedge grooves at the upper end and the lower end of the round bar conductor connector, a round bar conductor I of the pipe bus clamp penetrates into an embedded ring II, the embedded ring II penetrates into the upper end of the round bar conductor connector, and the round bar conductor I is rotated to enable the round bar conductor I and the embedded ring II to be clamped in the round bar conductor connector; the round bar conductor II penetrates into the other embedded ring II, the embedded ring II penetrates into the lower end of the round bar conductor connector, the round bar conductor II is rotated to enable the round bar conductor II and the embedded ring II to be clamped in the round bar conductor connector, the two wedges II are inserted into the two rectangular wedge grooves at one end of the round bar conductor connector, and two assembling screws respectively penetrate into screw holes at the bottoms of the two drawing grooves on the wedges II and the two hoops II to be tensioned, so that the pressing plate compresses the embedded ring II; and two wedges II are inserted into two rectangular wedge grooves II at the other end of the round bar conductor connector, two assembling screws respectively penetrate through screw holes at the bottoms of the drawing grooves II on the wedges II and the hoops II to be tightened, so that the pressing plate compresses the embedded ring II, and the two embedded rings II, the round bar conductor I, the round bar conductor II, the hoops II and the pressing plate form a low-resistance current path capable of bearing tension.
The radial stress required by the hoop II and the arc section of the pressing plate when the compression wedge II is locked is as follows:
Figure BDA0002868278580000112
in the formula (1), the reaction mixture is,
Pcmaxradial stress of the circular arc sections of the anchor ear II and the pressing plate in unit MPa;
Ri0.2the second yield strength of the insert ring, in MPa.
The hoop II and the minimum wall thickness required by the arc section of the pressing plate are as follows:
Figure BDA0002868278580000113
in the formula (2), the reaction mixture is,
Pcmaxradial stress of the circular arc sections of the anchor ear II and the pressing plate in unit MPa;
Di-the inner diameter of the circular arc segment in mm;
δcmincalculating the wall thickness in unit mm by using the anchor ear II and the circular arc section of the pressing plate;
Rc0.2the yield strength of the materials of the anchor ear II and the pressing plate is unit MPa;
two lowest axial pretightening forces F of each wedgemin：
As shown in FIGS. 4-5, assuming that the second wedge is uniformly expanded during expansion, the second wedge is subjected to five forces, i.e. a thrust force F, a die drawing surface pressure N of the second anchor ear, a friction force F of the die drawing surface of the second anchor ear and a pressure N of the die drawing surface of the pressing platebFriction force f of die drawing surface of pressing platebAccording to the balance of forces, there are:
F＝fcosβ+Nsinβ+fb cosβ+Nb sinβ (3)
f＝μN (4)
fb＝μNb (5)
Ncosβ+fb sinβ＝Nb cosβ+fsinβ (6)
wherein, mu- - - -coefficient of friction of the drawing surface is shown in Table 1;
beta- - - -two wedge draft angles, unit degree;
the relationship between the two axial thrusts of the wedge and the pressure of the hoop drawing die surface is obtained by deduction of the formulas (3) to (6):
F＝2N(μcosβ+sinβ) (7)
TABLE 1 machined die face Friction factor
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
Area of both sides of the insert ring
S＝2rπl (8)
In the formula (8), the reaction mixture is,
r is the inner radius of the insert ring II in mm;
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
the second radial stress of the expansion ring is
Figure BDA0002868278580000121
In the formula (9), the reaction mixture is,
Pc-the second radial stress of the expanded insert ring, in MPa;
alpha-the diameter of the round rod conductor I or the round rod conductor II in mm;
Ri0.2- -the second yield strength of the insert ring, in MPa;
to meet the conductive current-carrying capacity of the semi-arc groove inner interface, the engagement yield area of the semi-arc groove inner interface material must be larger than the sectional area of the round rod wiring terminal. In order to ensure good conductivity, the safety coefficient is 1.5. And (7) putting the formula (9) into the formula (7) to obtain the two lowest axial pretightening forces of each wedge as follows:
Figure BDA0002868278580000122
in the formula (1:0), the metal oxide,
k- -safety factor, 1.5;
α - -diameter of the round bar conductor in mm;
Ri0.2- -the second yield strength of the insert ring, in MPa;
mu- - - -coefficient of friction of the pattern drawing surface.
Upper limit axial pretightening force F of each wedgemax：
In order to ensure the safety of the second hoop and the pressing plate, the shearing stress of the pressing plate pressing beam cannot be greater than 0.5 time of the yield strength of the second hoop material except for meeting the conductive current-carrying capacity of an expansion section, and then:
Figure BDA0002868278580000131
in the formula (14), l represents the length of the second thimble in unit mm;
Rc0.2the yield strength of the materials of the anchor ear II and the pressing plate is unit MPa;
t < - > -the actual minimum thickness of the anchor ear II, unit mm;
n- - -hoop two-drawing die face pressure, unit N;
beta- - - -two wedge draft angles, unit degree;
bringing formula (11) into formula (7)
Figure BDA0002868278580000132
In the formula (12), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
Rc0.2the yield strength of the materials of the anchor ear II and the pressing plate is unit MPa;
t < - > -the actual minimum thickness of the anchor ear II, unit mm;
beta-two die-drawing angle of wedge, unit degree.
And (3) die drawing angle during self locking of the wedge II:
as shown in FIG. 6, assuming a wedge after inflation has ceasedThe two self-locking parts are stopped in the anchor ear, and the wedge is acted by four forces, namely the pressure N of the two drawing die surfaces of the anchor ear, the friction force f of the two drawing die surfaces of the anchor ear and the pressure N of the drawing die surfaces of the pressure plateiFrictional force ofiThe radial strain of each part caused by the expansion pressure is not changed, i.e. the pressure NiWithout change, i.e.
f＝μN (13)
fi＝μNi (14)
Ni sinβ+Nsinβ＝ficosβ+fcosβ (15)
Mu- - - -coefficient of friction in formula (14);
Ni-the pressure of the die drawing surface of the press plate in units N;
fi-the friction of the die drawing surface of the press plate in units N;
because the pressure of the two drawing die surfaces of the wedge II is equal, the wedge II is self-locked in the connected anchor ear II after the expansion is stopped, and the critical condition is that
tgβ≤μ。 (16)
The self-locking of the second wedge is related to the friction coefficient of the contact material and the drawing angle and is unrelated to the axial pretightening force of the second 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 two draft angles of several kinds of metal self-locking 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
Round bar conductor structure: the first round bar conductor and the second round bar conductor have the same structure, and are made of soft pure metal with similar material as shown in fig. 26-27. Copper designation T1, yield strength R0.2Not higher than 70 MPa; aluminum alloy designation 1A99, yield strength R0.2Not higher than 45 MPa; typical design parameters for the tension rod conductor are shown in table 3 (length units are mm).
Table 3:
Figure BDA0002868278580000141
the embedded ring has a structure II: as shown in fig. 7-8, the second insert ring is made of soft pure metal with similar material of the round rod conductor. Copper designation T1, yield strength R0.2Not higher than 70 MPa; aluminum alloy designation 1A99, yield strength R0.2Not higher than 45 MPa. The calculation formula of the second typical design of the insert ring is as follows, and the parameters are shown in Table 4.
Figure BDA0002868278580000142
Table 4:
Figure BDA0002868278580000151
the second tension-connected anchor ear is characterized in that as shown in fig. 9-16, the second tension-connected anchor ear is made of hard alloy with similar conductor material of the tension round rod. The copper alloy is T2, and the yield strength is not lower than 160 MPa; the aluminum alloy is 5A05, and the yield strength is not lower than 115 MPa; the anchor ear II is an elongated cylindrical sleeve rectangular wedge pressing structure, each parameter of the anchor ear II in tension connection depends on the diameter alpha of a tension round bar conductor and the draft angle beta of the anchor ear II draft surface, and a typical design calculation formula is as follows (length units are mm, and part of parameters are shown in Table 5):
Figure BDA0002868278580000152
Figure BDA0002868278580000153
Figure BDA0002868278580000154
Figure BDA0002868278580000155
h0＝2t+2s1+a+2q1
Figure BDA0002868278580000156
Figure BDA0002868278580000157
h4＝2t
h6＝2t
h2＝t+2r+2q1+t+t＝3t+2r+2q1
h3＝h2-h6
h8＝t+r+q1
h9＝h8-0.3
h5＝t
h10＝2(l+a)
h11＝t
Figure BDA0002868278580000161
Figure BDA0002868278580000162
h14＝a
h15＝2a
k1＝1.5
Figure BDA0002868278580000163
Figure BDA0002868278580000164
Figure BDA0002868278580000165
m1＝a+2q1-2t
m2＝t
m3＝s1
table 5:
Figure BDA0002868278580000166
the pressing plate with tension connection has the structural characteristics that: as shown in fig. 17-21, the tension-connected platens are machined from hard alloys of nearly round bar conductor material. The copper alloy is T2, and the yield strength is not lower than 160 MPa; the aluminum alloy grade is 5A05, the yield strength is not lower than 115MPa, the pressure plate is of a semicircular wedge pressing structure, each parameter of the pressure plate depends on the diameter alpha of the round bar conductor and the draft angle beta of the draft surface of the pressure plate, and a typical design calculation formula is as follows (the length unit is mm):
Figure BDA0002868278580000167
Figure BDA0002868278580000168
R3＝R1+t
Figure BDA0002868278580000171
d0＝2d6+a+2q1
Figure BDA0002868278580000172
d2＝d1-0.3
d3＝s1-0.1
d4＝R1+d6
d5＝a
d6＝s1-0.1
Figure BDA0002868278580000173
h10＝2(l+a)
h15＝2a
Figure BDA0002868278580000174
Figure BDA0002868278580000175
the second wedge has the structural characteristics that: as shown in fig. 22-24, the second wedge is made of hard alloy with a round rod conductor material. The copper alloy is T2, and the yield strength is not lower than 160 MPa; the aluminum alloy is 5A05, and the yield strength is not lower than 115 MPa. The bottom end side of the diameter P2 of the second through hole of the wedge is a puller bolt hole, each parameter of the wedge depends on the diameter a of the round bar conductor and the draft angle β of the pressing plate draft surface, and typical design parameters are shown in table 6 (length units are mm).
Table 6:
Figure BDA0002868278580000176
the above description is only for the specific embodiments 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 the 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. The utility model provides a coaxial drainage device of tubular busbar round bar conductor which characterized in that: the self-locking tension connector comprises a tube bus clamp (1) and a coaxial round bar conductor wedge self-locking tension connector (2), wherein the upper end of the tube bus clamp (1) is fixedly connected onto a tube bus conductor (105), a round bar conductor I (3) arranged at the lower end of the tube bus clamp is fixedly connected to the upper end of the coaxial round bar conductor wedge self-locking tension connector (2), and the lower end of the coaxial round bar conductor wedge self-locking tension connector (2) is fixedly connected with a round bar conductor II (206).
2. The coaxial drainage device of the tubular busbar round rod conductor according to claim 1, characterized in that: the tube bus-bar clamp (1) comprises an upper hoop (101) which is made of the same conductive material, the lower hoop (102) and the first wedge (104) further comprise a first conductive embedded ring (103), steps are arranged on two sides of the upper hoop (101), four first die-pulling grooves (106) are formed in the upper surface of each step, an extension section is arranged at the upper end of each of two sides of the lower hoop (102), the extension section is arranged in an inverted L-shaped structure, four first die-pulling surfaces (107) corresponding to the four first die-pulling grooves (106) are arranged on the upper inner side of the extension section, the four first die-pulling grooves (106) and the four first die-pulling surfaces (107) form four rectangular wedge grooves respectively, the four first wedge (104) are inserted into the four rectangular wedge grooves respectively to fix the upper hoop (101) and the lower hoop (102), a first notch (108) is axially arranged on the first embedded ring (103), and a female pipe conductor (105) is arranged in a round hole formed between the upper hoop (1) and the lower hoop (102) in the elastic manner.
3. The coaxial drainage device of the tubular busbar round rod conductor according to claim 1, characterized in that: the coaxial round rod conductor wedge self-locking tension connector (2) comprises a hoop II (201), a pressing plate (202) and a wedge II (204) which are made of the same conductive materials, and further comprises a conductive embedded ring II (203), wherein the hoop II (201) is of a strip-shaped structure, a square through hole (208) is formed in the length direction, a semi-circular through groove I (209) is formed in the middle of the bottom side of the square through hole (208) in the length direction, the pressing plate (202) is arranged in the square through hole (208), a semi-circular through groove II (212) is formed in the middle of the bottom side of the length direction, steps are arranged on two sides of the pressing plate (202), four symmetrical die drawing surfaces (213) are arranged on the upper surfaces of the steps, four die drawing grooves II (214) corresponding to the four die drawing surfaces II (213) are arranged on the upper surfaces of two ends in the square through hole (208), the four die drawing surfaces II (213) and the four die drawing grooves, the two rectangular wedge grooves are respectively inserted into the four rectangular wedge grooves to fix the hoop II (201) and the pressing plate (202), the embedded ring II (203) is axially provided with a gap II (210), the two rectangular wedge grooves are respectively and elastically arranged in two ends of a round hole formed between the hoop II (201) and the pressing plate (202) and respectively surround the round rod conductor I (3) and the round rod conductor II (206).
4. The coaxial drainage device of the tubular busbar round rod conductor according to claim 3, characterized in that: each second wedge (204) penetrates through an assembly screw (205) along the length direction of the second wedge (204) and is fastened on the inner end side face of the second pattern drawing groove (14) on the hoop II (201); a U-shaped notch (207) is transversely formed in the middle of the upper side of the hoop II (201); and a positioning set screw (211) is adopted between the middle part of the pressure plate (202) and the second hoop (201) for positioning.
5. The construction method of the coaxial drainage device of the tubular busbar round rod conductor according to any one of claims 1 to 4, characterized by comprising the following steps: the method comprises a method for installing a pipe bus clamp and a method for installing a coaxial round rod conductor wedge self-locking tension connector, wherein the method for installing the pipe bus clamp comprises the following steps: installing a first round bar conductor of a tubular bus clamp on the upper end of a coaxial round bar conductor wedge self-locking tension connector, wrapping the tubular bus conductor by an embedded ring I, installing the embedded ring I into a lower anchor ear, pressing the embedded ring I by an upper anchor ear, inserting the four wedges I into four rectangular wedge grooves formed at two ends of the lower anchor ear and the upper anchor ear respectively, and pressing the four wedges I by a puller so that contact surfaces between the upper anchor ear and the embedded ring I as well as between the embedded ring I and the tubular bus conductor are fully subjected to yielding meshing to form a low-resistance current path; the installation method of the coaxial round bar conductor wedge self-locking tension connector comprises the following steps: the pressing plate penetrates into the hoop II, a positioning set screw is installed to form a round bar conductor connector, four die drawing grooves of the hoop II and four die drawing surfaces of the pressing plate jointly form two rectangular wedge grooves at the upper end and the lower end of the round bar conductor connector, a round bar conductor I of the pipe bus clamp penetrates into an embedded ring II, the embedded ring II penetrates into the upper end of the round bar conductor connector, and the round bar conductor I is rotated to enable the round bar conductor I and the embedded ring II to be clamped in the round bar conductor connector; the round bar conductor II penetrates into the other embedded ring II, the embedded ring II penetrates into the lower end of the round bar conductor connector, the round bar conductor II is rotated to enable the round bar conductor II and the embedded ring II to be clamped in the round bar conductor connector, the two wedges II are inserted into the two rectangular wedge grooves at one end of the round bar conductor connector, and two assembling screws respectively penetrate into screw holes at the bottoms of the two drawing grooves on the wedges II and the two hoops II to be tensioned, so that the pressing plate compresses the embedded ring II; and inserting the two wedges II into the two rectangular wedge grooves II at the other end of the round bar conductor connector, and respectively penetrating two assembling screws into screw holes at the bottoms of the two drawing grooves on the wedges II and the two anchor ears II for tensioning so as to enable the pressing plate to tightly press the two embedded rings.
6. The construction method of the coaxial drainage device of the tubular busbar round rod conductor according to claim 5, characterized in that: the radial stress required by the hoop II and the arc section of the pressing plate when the compression wedge II is locked is as follows:
Figure FDA0002868278570000021
in the formula (1), the reaction mixture is,
Pcmaxradial stress of the circular arc sections of the anchor ear II and the pressing plate in unit MPa;
Ri0.2the second yield strength of the insert ring, in MPa.
7. The construction method of the coaxial drainage device of the tubular busbar round rod conductor according to claim 5, characterized in that: the hoop II and the minimum wall thickness required by the arc section of the pressing plate are as follows:
Figure FDA0002868278570000022
in the formula (2), the reaction mixture is,
Pcmaxradial stress of the circular arc sections of the anchor ear II and the pressing plate in unit MPa;
Di-the inner diameter of the circular arc segment in mm;
δcmincalculating the wall thickness in unit mm by using the anchor ear II and the circular arc section of the pressing plate;
Rc0.2the yield strength of the materials of the anchor ear II and the pressing plate is unit MPa;
8. the construction method of the coaxial drainage device of the tubular busbar round rod conductor according to claim 5, characterized in that: two lowest axial pretightening forces F of each wedgemin：
Assuming that the second wedge is uniformly expanded in the expansion process, the second wedge is acted by five forces, namely a thrust F, a die drawing surface pressure N of the second anchor ear, a friction force F of the die drawing surface of the second anchor ear and a pressure N of the die drawing surface of the pressing platebFriction force f of die drawing surface of pressing platebAccording to the balance of forces, there are:
F＝fcosβ+Nsinβ+fbcosβ+Nbsinβ (3)
f＝μN (4)
fb＝μNb (5)
Ncosβ+fbsinβ＝Nbcosβ+fsinβ (6)
wherein, mu- - - -coefficient of friction of the pattern drawing surface;
beta- - - -two wedge draft angles, unit degree;
the relationship between the two axial thrusts of the wedge and the pressure of the hoop drawing die surface is obtained by deduction of the formulas (3) to (6):
F＝2N(μcosβ+sinβ) (7)
area of both sides of the insert ring
S＝2rπl (8)
In the formula (8), the reaction mixture is,
r is the inner radius of the insert ring II in mm;
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
the second radial stress of the expansion ring is
Figure FDA0002868278570000031
In the formula (9), the reaction mixture is,
Pc-the second radial stress of the expanded insert ring, in MPa;
alpha-the diameter of the round rod conductor I or the round rod conductor II in mm;
Ri0.2- -the second yield strength of the insert ring, in MPa;
to meet the conductive current-carrying capacity of the interface in the semi-arc groove, the meshing yield area of the interface material in the semi-arc groove must be larger than the sectional area of the round rod binding post, the formula (9) is put into the formula (7), and the lowest axial pretightening force of each wedge is obtained as follows:
Figure FDA0002868278570000032
in the formula (10), the compound represented by the formula (10),
k- -safety factor, 1.5;
α - -diameter of the round bar conductor in mm;
Ri0.2- -the second yield strength of the insert ring, in MPa;
mu- - - -coefficient of friction of the pattern drawing surface.
9. The construction method of the coaxial drainage device of the tubular busbar round rod conductor according to claim 8, characterized in that: two upper limit axial pretightening forces F of each wedgemax：
The shear stress of the anchor ear second compression beam cannot be larger than the yield strength of the anchor ear second material by 0.5 times, and then:
Figure FDA0002868278570000033
in the formula (14), l represents the length of the second thimble in unit mm;
Rc0.2the yield strength of the materials of the anchor ear II and the pressing plate is unit MPa;
t < - > -the actual minimum thickness of the anchor ear II, unit mm;
n- - -hoop two-drawing die face pressure, unit N;
beta- - - -two wedge draft angles, unit degree;
bringing formula (11) into formula (7)
Figure FDA0002868278570000041
In the formula (12), the reaction mixture is,
l- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
Rc0.2the yield strength of the materials of the anchor ear II and the pressing plate is unit MPa;
t < - > -the actual minimum thickness of the anchor ear II, unit mm;
beta-two die-drawing angle of wedge, unit degree.
10. The construction method of the coaxial drainage device of the tubular busbar round rod conductor according to claim 5, characterized in that: and (3) die drawing angle during self locking of the wedge II:
suppose thatAfter the expansion is stopped, the second wedge is automatically locked and stopped in the anchor ear, and the wedge is acted by four forces, namely the pressure N of the die drawing surface of the second anchor ear, the friction force f of the die drawing surface of the second anchor ear and the pressure N of the die drawing surface of the pressure plateiFrictional force ofiThe radial strain of each part caused by the expansion pressure is not changed, i.e. the pressure NiWithout change, i.e.
f＝μN (13)
fi＝μNi (14)
Nisinβ+Nsinβ＝ficosβ+fcosβ (15)
Mu- - - -coefficient of friction in formula (14);
Ni-the pressure of the die drawing surface of the press plate in units N;
fi-the friction of the die drawing surface of the press plate in units N;
because the pressure of the two drawing die surfaces of the wedge II is equal, the wedge II is self-locked in the connected anchor ear II after the expansion is stopped, and the critical condition is that
tgβ≤μ。 (16)
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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
CN211556179U (en) * 2020-03-24 2020-09-22 搏世因(江苏)高压电气有限公司 Tubular bus connecting structure with middle joint insulation seal

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CN104600606A (en) * 2013-10-30 2015-05-06 国家电网公司 Sliding electrical equipment energy consuming fitting and installation method
CN108574146A (en) * 2018-06-01 2018-09-25 贵州电网有限责任公司 A kind of round wires conducting wire L-type locking connector and attaching method thereof
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
CN211556179U (en) * 2020-03-24 2020-09-22 搏世因(江苏)高压电气有限公司 Tubular bus connecting structure with middle joint insulation seal

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