CN105890835A - Measuring method for interface pressure of thermal-contraction intermediate connector of cable - Google Patents

Measuring method for interface pressure of thermal-contraction intermediate connector of cable Download PDF

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Publication number
CN105890835A
CN105890835A CN201610166336.4A CN201610166336A CN105890835A CN 105890835 A CN105890835 A CN 105890835A CN 201610166336 A CN201610166336 A CN 201610166336A CN 105890835 A CN105890835 A CN 105890835A
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China
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cold
cable
intermediate joint
shrink tube
shrinking intermediate
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CN105890835B (en
Inventor
范伟男
黄炎光
莫文雄
王勇
熊俊
索智鑫
方健
张亚茹
杜钢
覃煜
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Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangzhou Power Supply Bureau Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cable Accessories (AREA)

Abstract

The invention relates to a measuring method for an interface pressure of a thermal-contraction intermediate connector of a cable. The method comprises: a structural parameter of a thermal-contraction intermediate connector of a cable is obtained; according to the structural parameter, a material mechanical model of the thermal-contraction intermediate connector of the cable is established; and on the basis of the material mechanical model of the thermal-contraction intermediate connector of the cable, calculation is carried out to obtain an interface pressure value of the thermal-contraction intermediate connector of the cable. According to the technical scheme, with the measuring method, measurement on the interface pressure of the thermal-contraction intermediate connector of the cable is realized; and accuracy of the measurement result of the interface pressure of the thermal-contraction intermediate connector of the cable is improved effectively.

Description

The measuring method of cable cold-shrinking intermediate joint interfacial pressure
Technical field
The present invention relates to transmission line of electricity security fields, particularly relate to a kind of cable cold-shrinking intermediate joint interface pressure The measuring method of power.
Background technology
Many employing crosslinked polyethylene sheath power cables in existing ultra-high-tension power transmission line, when crosslinked polyethylene electricity After the reasons such as cable road is short-circuited, insulation ag(e)ing or other External Force Actings cause breakdown fault, conventional place Reason method is: is cut by faulty section cable and abandons, and uses halfway junction box to be coupled together by the cable of cut-out.Right In the selection of halfway junction box, cold shrink type middle joint because its insulation is reliable, good airproof performance, easy for installation, The plurality of advantages such as safe and reliable, becomes ideal transition joint.Cable cold-shrinking intermediate joint utilizes rubber The characteristic of " elastic memory ", uses advanced expansion technique, by the cable termination glue part that manufactured in elasticity In the range of strut in advance, be inserted in plastic support bar；During installation, only need to pump plastic support bar, cable termination Rubber parts will shrink rapidly to be held tightly on cable.When reality is applied, the protecting pipe of cable accessory, branch Set, sealing pipe etc. are entirely shrinkage product, it is ensured that the preferable sealing of twisted polyethylene cable circuit.
Along with cold-shrinking intermediate joint is at twisted polyethylene cable circuit, especially at 10kV twisted polyethylene cable line Extensive application in road, owing to transition joint cold shrink tube silicone rubber is sent out with the insulator interface that crosslinked polyethylene is constituted Life is discharged and is caused the situation of transmission line malfunction the most frequently to occur, and wherein, cold shrink tube interfacial pressure deficiency is The one of the main reasons that fault occurs.Therefore, carry out cold shrink tube interfacial pressure calculating becoming prevention with measurement The primary means that this fault occurs.
At present, many scholars have been directed towards interfacial pressure and have carried out more research in the industry, conventional method have with Under several: one, find the relation between interfacial pressure and breakdown performance, but its test specimen be plane circle Face, lacks normal electric field, and the Electric Field Distribution of the transition joint from reality application is different, does not possess the suitability； Two, the mode utilizing aluminum pipe patch foil gauge measures interfacial pressure, but, the measurement model of selection connects with actual Header structure is not quite similar, and does not the most possess the suitability.In sum, existing cold-shrinking intermediate joint interface pressure Most and the actual cold-shrinking intermediate joint of measurement object of the measuring method of power is different；And, it is mostly survey indirectly Amount, causes measurement result inaccurate, it is impossible to play the effect of prevention power distribution network transmission line malfunction.
Summary of the invention
Based on this, it is necessary to for the measurement result of the measuring method of existing cold-shrinking intermediate joint interfacial pressure The technical problem that error is bigger, it is provided that the measuring method of a kind of cable cold-shrinking intermediate joint interfacial pressure.
The measuring method of a kind of cable cold-shrinking intermediate joint interfacial pressure, comprises the steps:
Set up the mechanics of materials model of cable cold-shrinking intermediate joint；Wherein, described cable cold-shrinking intermediate joint Mechanics of materials model is:
F = P S P = E r i ( ( r i - d d 0 ) l n r o 0 r i 0 + ( d d 0 - 1 ) d ) d = r o - r i d 0 = r o 0 - r i 0 ;
In formula, F represents the interfacial pressure of cold-shrinking intermediate joint, and P represents the pressure that cold-shrinking intermediate joint interface is subject to By force, S represents the interfacial area of cold-shrinking intermediate joint, and l represents cold shrink tube axial length, and E represents cold shrink tube silicon The elastic modelling quantity of elastomeric material, riRepresent inside radius during cold shrink tube duty, r0Represent cold shrink tube work shape Outer radius during state, d represents thickness during cold shrink tube duty, d0Represent cold shrink tube original depth, ro0Table Show the initial outer radius of cold shrink tube, ri0Represent the initial inside radius of cold shrink tube；
According to the mechanics of materials model of described cable cold-shrinking intermediate joint, it is calculated cable cold-shrinking intermediate joint Interfacial pressure value.
The measuring method of above-mentioned cable cold-shrinking intermediate joint interfacial pressure, by setting up cable cold-shrinking intermediate joint Mechanics of materials model, and according to the mechanics of materials model of described cable cold-shrinking intermediate joint, be calculated electricity The interfacial pressure value of cable cold-shrinking intermediate joint.Pass through technique scheme, it is achieved that to indirect in cable shrinkage The measurement of head interfacial pressure, is effectively improved the accuracy of measurement result.
Accompanying drawing explanation
Fig. 1 is the measuring method flow process of the cable cold-shrinking intermediate joint interfacial pressure of one embodiment of the present of invention Figure；
Fig. 2 is in the measuring method of cable cold-shrinking intermediate joint interfacial pressure of an alternative embodiment of the invention The mechanics of materials model of the cable cold-shrinking intermediate joint set up.
Detailed description of the invention
In order to further illustrate the technological means and the effect of acquirement that the present invention taked, below in conjunction with the accompanying drawings And preferred embodiment, to technical scheme, carry out clear and complete description.
As it is shown in figure 1, the cable cold-shrinking intermediate joint interfacial pressure that Fig. 1 is one embodiment of the present of invention Measuring method flow chart, comprises the steps:
Step S101: obtain the structural parameters of cable cold-shrinking intermediate joint；
Step S102: set up the mechanics of materials model of cable cold-shrinking intermediate joint according to described structural parameters；
As in an embodiment, the mechanics of materials model of described cable cold-shrinking intermediate joint is:
F = P S P = E r i ( ( r i - d d 0 ) l n r o 0 r i 0 + ( d d 0 - 1 ) d ) d = r o - r i d 0 = r o 0 - r i 0 ;
In formula, F represents the interfacial pressure of cold-shrinking intermediate joint, and P represents the pressure that cold-shrinking intermediate joint interface is subject to By force, S represents the interfacial area of cold-shrinking intermediate joint, and l represents cold shrink tube axial length, and E represents cold shrink tube silicon The elastic modelling quantity of elastomeric material, riRepresent inside radius during cold shrink tube duty, r0Represent cold shrink tube work shape Outer radius during state, d represents thickness during cold shrink tube duty, d0Represent cold shrink tube original depth, ro0Table Show the initial outer radius of cold shrink tube, ri0Represent the initial inside radius of cold shrink tube.
In this step, it is by cold shrink tube silastic material and cable insulation due to cold-contraction type cable intermediate joint The interference fit of crosslinked polyethylene produces interfacial pressure, thus ensures the electrical strength of this insulator interface.By Elastic modelling quantity in crosslinked polyethylene is much larger than silicone rubber, is therefore approximately considered in contraction, and crosslinking is poly- Ethylene insulation is rigid objects, and external diameter keeps constant.Separately need to think the elastomeric material that silicone rubber is isotropic, The i.e. drawing-die amount of all directions is identical.Use imfinitesimal method can be to the silicone rubber cold shrink tube of transition joint to insulating surface Pressure carry out theoretical analysis and calculation.
As in figure 2 it is shown, the cable cold-shrinking intermediate joint interfacial pressure that Fig. 2 is an alternative embodiment of the invention Measuring method in the mechanics of materials model of cable cold-shrinking intermediate joint set up, in figure, ri0At the beginning of cold shrink tube Beginning inside radius, ro0For the initial outer radius of cold shrink tube, remember d0=ro0-ri0For cold shrink tube original depth, riFor shrinkage Inside radius (i.e. insulate outer radius), r under pipe duty0For outer radius under cold shrink tube duty, remember d=r0-ri For thickness during cold shrink tube duty, Δ θ is a less central angle.Cold shrink tube axial length is l, elastic Modulus is E.Inside and outside radius before and after expanding due to cold shrink tube all can record, therefore about the analysis of Poisson's ratio, Silastic material can be approximately considered internal for radially uniform strain.Therefore under cold shrink tube duty, with interior Wall (inside radius ri) distance is x, thickness is the infinitesimal layer of dx, and its strain is:
ϵ = ( r i - r i 0 - ( d 0 d - 1 ) x ) Δ θ ( d 0 d x + r i 0 ) Δ θ ;
The tangential stress in this position is:
DF=σ dS=lE ε dx；
Tangentially made a concerted effort by integration be:
F = l E ( ( r i - d d 0 r i 0 ) l n r o 0 r i 0 + ( d d 0 - 1 ) d ) ;
Finally, radial pressure is the tangential synthesis made a concerted effort, and the interface pressure obtaining cable cold-shrinking intermediate joint is:
p = lim Δ θ → 0 2 * F * s i n Δ θ 2 r i * l * Δ θ ;
Substitute into and finally give following formula after abbreviation:
p = E r i ( ( r i - d d 0 r i 0 ) l n r o 0 r i 0 + ( d d 0 - 1 ) d ) ;
It follows that interfacial pressure and the naturalness internal diameter of transition joint silicone rubber cold shrink tube, external diameter, work The elastic modelling quantity making the internal diameter of state, external diameter, and silastic material is correlated with.In practice, pass through After measurement obtains each parameter, it is possible to by theoretical formula, the interfacial pressure situation of transition joint is calculated Assessment.
Step S103: according to the mechanics of materials model of described cable cold-shrinking intermediate joint, be calculated cable cold The interfacial pressure value of contracting transition joint.
The measuring method of above-mentioned cable cold-shrinking intermediate joint interfacial pressure, by setting up cable cold-shrinking intermediate joint Mechanics of materials model, and according to the mechanics of materials model of described cable cold-shrinking intermediate joint, be calculated electricity The interfacial pressure value of cable cold-shrinking intermediate joint.Pass through technique scheme, it is achieved that to indirect in cable shrinkage The measurement of head interfacial pressure, is effectively improved the accuracy of measurement result.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, At the described mechanics of materials model according to described cable cold-shrinking intermediate joint, it is calculated in cable shrinkage indirectly Before step S102 of the interfacial pressure value of head, it is also possible to including:
Inside radius when utilizing cold shrink tube duty described in gage measuring and outer radius.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, Described measurer is slide gauge.
In the above-described embodiments, inside radius when using vernier caliper measurement cold shrink tube in working order and outer half Footpath, the model of concrete slide gauge reasonably can select according to the size of cold shrink tube.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, Described utilize cold shrink tube duty described in gage measuring time inside radius and outer radius step after, also Including:
By axially spaced for described cold shrink tube, remove from cable, measure after described cold shrink tube is restored initial in Radius and initial outer radius.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, The step of described inside radius when utilizing cold shrink tube duty described in gage measuring and outer radius includes:
Inside radius when utilizing cold shrink tube duty described in measurer repetitive measurement and outer radius；
Initial inside radius and the step of initial outer radius after the recovery of described measurement described cold shrink tube include:
Initial inside radius after cold shrink tube recovery described in repetitive measurement and initial outer radius.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, Also include:
The interfacial area of repetitive measurement cold-shrinking intermediate joint and cold shrink tube axial length.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, Inside radius during cold shrink tube duty according to repetitive measurement and outer radius, cold shrink tube restore after initial in Radius and initial outer radius, the interfacial area of cold-shrinking intermediate joint and cold shrink tube axial length and described cable The mechanics of materials model of cold-shrinking intermediate joint interfacial pressure, is calculated multiple boundaries of cable cold-shrinking intermediate joint Surface pressure value；
Being averaged the summation of the plurality of interfacial pressure value, the interfacial pressure obtaining cable cold-shrinking intermediate joint is put down Average.
In the above-described embodiments, in order to make the mechanics of materials model utilizing above-mentioned cable cold-shrinking intermediate joint calculate The interfacial pressure value of the cable cold-shrinking intermediate joint obtained is more accurate, can be to the relevant parameter of cold shrink tube self Take multiple measurements, substitute into respectively in the mechanics of materials model of cable cold-shrinking intermediate joint and calculate, obtain Multiple interfacial pressure values；Again the summation of these multiple interfacial pressure values is averaged, has just obtained in cable shrinkage Between the interfacial pressure meansigma methods of joint.The measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, By the summation of calculated multiple interfacial pressure values is averaged, further increase the accurate of measurement result Property.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, Described cold-shrinking intermediate joint is by being exposed by the core of two cut cables, by the outer half of said two cut cable Conductor is peeled off, and makes insulated part expose, and is carried out described insulated part；Again by said two cable The core of section aligns, and the mode using aluminium hydraulic pressed connecting pipe to carry out crimping makes.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, The described step being carried out described insulated part includes:
Utilize ethanol paper to described insulated part wiped clean.
Wherein in an embodiment, the measuring method of the cable cold-shrinking intermediate joint interfacial pressure of the present invention, Described cold shrink tube is silicone rubber cold shrink tube.
The measuring method of above-mentioned cable cold-shrinking intermediate joint interfacial pressure, by setting up cable cold-shrinking intermediate joint Mechanics of materials model, and according to the mechanics of materials model of described cable cold-shrinking intermediate joint, be calculated electricity The interfacial pressure value of cable cold-shrinking intermediate joint.Pass through technique scheme, it is achieved that to indirect in cable shrinkage The measurement of head interfacial pressure, is effectively improved the accuracy of measurement result.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the most right The all possible combination of each technical characteristic in above-described embodiment is all described, but, if these skills There is not contradiction in the combination of art feature, is all considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, But can not therefore be construed as limiting the scope of the patent.It should be pointed out that, for this area For those of ordinary skill, without departing from the inventive concept of the premise, it is also possible to make some deformation and change Entering, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended power Profit requires to be as the criterion.

Claims (10)

1. the measuring method of a cable cold-shrinking intermediate joint interfacial pressure, it is characterised in that include walking as follows Rapid:
Obtain the structural parameters of cable cold-shrinking intermediate joint；
The mechanics of materials model of cable cold-shrinking intermediate joint is set up according to described structural parameters；
According to the mechanics of materials model of described cable cold-shrinking intermediate joint, it is calculated cable cold-shrinking intermediate joint Interfacial pressure value.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 1, its feature Being, the mechanics of materials model of described cable cold-shrinking intermediate joint is:
F = P S P = E r i ( ( r i - d d 0 ) l n r o 0 r i 0 + ( d d 0 - 1 ) d ) d = r o - r i d 0 = r o 0 - r i 0 ;
In formula, F represents the interfacial pressure of cold-shrinking intermediate joint, and P represents the pressure that cold-shrinking intermediate joint interface is subject to By force, S represents the interfacial area of cold-shrinking intermediate joint, and l represents cold shrink tube axial length, and E represents cold shrink tube silicon The elastic modelling quantity of elastomeric material, riRepresent inside radius during cold shrink tube duty, r0Represent cold shrink tube work shape Outer radius during state, d represents thickness during cold shrink tube duty, d0Represent cold shrink tube original depth, ro0Table Show the initial outer radius of cold shrink tube, ri0Represent the initial inside radius of cold shrink tube.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 1, its feature It is, at the described mechanics of materials model according to described cable cold-shrinking intermediate joint, is calculated cable shrinkage Before the step of the interfacial pressure value of transition joint, also include:
Inside radius when utilizing cold shrink tube duty described in gage measuring and outer radius.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 3, its feature It is: described measurer is slide gauge.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 3, its feature Be, described utilize cold shrink tube duty described in gage measuring time inside radius and outer radius step it After, also include:
By axially spaced for described cold shrink tube, remove from cable, measure after described cold shrink tube is restored initial in Radius and initial outer radius.
6. according to the measuring method of the cable cold-shrinking intermediate joint interfacial pressure described in claim 3 or 5, its It is characterised by, described inside radius when utilizing cold shrink tube duty described in gage measuring and the step of outer radius Including:
Inside radius when utilizing cold shrink tube duty described in measurer repetitive measurement and outer radius；
Initial inside radius and the step of initial outer radius after the recovery of described measurement described cold shrink tube include:
Initial inside radius after cold shrink tube recovery described in repetitive measurement and initial outer radius.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 1, its feature It is, also includes:
The interfacial area of repetitive measurement cold-shrinking intermediate joint and cold shrink tube axial length.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 7, its feature It is:
Inside radius during cold shrink tube duty according to repetitive measurement and outer radius, cold shrink tube restore after at the beginning of Beginning inside radius and initial outer radius, the interfacial area of cold-shrinking intermediate joint and cold shrink tube axial length and described The mechanics of materials model of cable cold-shrinking intermediate joint interfacial pressure, is calculated cable cold-shrinking intermediate joint many Individual interfacial pressure value；
Being averaged the summation of the plurality of interfacial pressure value, the interfacial pressure obtaining cable cold-shrinking intermediate joint is put down Average.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 1, its feature It is:
Described cold-shrinking intermediate joint is by being exposed by the core of two cut cables, by said two cut cable Outer semiconductor is peeled off, and makes insulated part expose, and is carried out described insulated part；Again by said two The core of cut cable aligns, and the mode using aluminium hydraulic pressed connecting pipe to carry out crimping makes.
The measuring method of cable cold-shrinking intermediate joint interfacial pressure the most according to claim 9, it is special Levying and be, the described step being carried out described insulated part includes:
Utilize ethanol paper to described insulated part wiped clean.
CN201610166336.4A 2016-03-21 2016-03-21 The measuring method of cable cold-shrinking intermediate joint interfacial pressure Active CN105890835B (en)

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CN108007622A (en) * 2017-12-18 2018-05-08 中国电力科学研究院有限公司 Cable connector interfacial pressure measuring method
CN109406032A (en) * 2018-12-28 2019-03-01 长园电力技术有限公司 A kind of cable accessory interfacial pressure online testing device
CN113138048A (en) * 2021-03-25 2021-07-20 四川大学 Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound

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CN108007622A (en) * 2017-12-18 2018-05-08 中国电力科学研究院有限公司 Cable connector interfacial pressure measuring method
CN109406032A (en) * 2018-12-28 2019-03-01 长园电力技术有限公司 A kind of cable accessory interfacial pressure online testing device
CN113138048A (en) * 2021-03-25 2021-07-20 四川大学 Nondestructive live-line detection method for cable joint interface pressure based on stress ultrasound

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Effective date of registration: 20200923

Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No.

Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.

Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No.

Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd.