CN106524983A - Method of measuring cable joint eccentricity distance - Google Patents
Method of measuring cable joint eccentricity distance Download PDFInfo
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- CN106524983A CN106524983A CN201611042670.5A CN201611042670A CN106524983A CN 106524983 A CN106524983 A CN 106524983A CN 201611042670 A CN201611042670 A CN 201611042670A CN 106524983 A CN106524983 A CN 106524983A
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- eccentric
- temperature
- cable connector
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- angle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
- G01B21/24—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes for testing alignment of axes
Abstract
The invention discloses a method of measuring a cable joint eccentricity distance. The outer boundary of the cross section of the cable joint is uniformly provided with N temperature measurement devices, and N is an even number; the temperature measurement devices are grouped, two temperature measurement devices whose mounting position connection line passes across the center of the cable joint cross section are as a group, and the absolute value for a difference value between temperature numerical values measured by two temperature measurement devices in each group serves as the temperature deviation of the group; the cable joint is modeled, and a function relationship among the cable joint eccentricity distance, an eccentricity angle and the temperature deviation is acquired; the surface temperature of each temperature measurement point on a to-be-measured cable joint is measured, the eccentricity distance of the to-be-measured cable joint is acquired according to the function relationship among the cable joint eccentricity distance, the eccentricity angle and the temperature deviation, and thus, accurate measurement on the cable joint eccentricity distance is realized. Application of an eccentric cable joint to a power line is avoided; the cable joint accident rate is reduced; and security operation of the power system is ensured. The method of the invention has the advantages of simple operation, low cost and easy realization.
Description
Technical field
The present invention relates to electric power facility detection technique field, and in particular to a kind of measurement side of cable connector eccentric distance
Method.
Background technology
After cable laying is good, in order to become a continuous circuit, each section of line must be connected as an entirety, these
Tie point is known as cable connector.But, in current power system, cable connector accident rate account for the 90% of cable fault with
On, cable connector has become one of weak link in power supply grid safe operation.And the topmost reason of cable and junction malfunction
Be due to manufacturing process in construction lack of standardization caused by cable connector it is eccentric.Cable connector bias will cause operation power process
Middle cable connector interior contact resistance is excessive, and cable connector is overheated, causes great threat to cable run safe operation.
Therefore, how to detect the cable connector whether bias significant problem that to be Utilities Electric Co. face, but at present simultaneously
A kind of method for not having cable connector degree of eccentricity to completing to carry out effective assessment.
The content of the invention
The present invention provides a kind of measuring method of cable connector eccentric distance, can realize to cable connector eccentric distance
Accurately measure, meanwhile, the method have it is simple to operate, with low cost, the characteristics of easily realization.
The present invention is achieved through the following technical solutions：
A kind of measuring method of cable connector eccentric distance, comprises the following steps：
S1, the external boundary in cable connector cross section are uniformly arranged N number of point for measuring temperature, and each point for measuring temperature arranges a thermometric dress
Put, N is even number；
S2, temperature measuring equipment is grouped, installation site line through two temperature measuring equipments of cable connector cross-section center is
One group, per group in the measurement of two temperature measuring equipments Temperature numerical difference absolute value as this group of temperature deviation；
S3, cable connector is modeled, obtain cable connector eccentric distance, function between eccentric angle and temperature deviation and close
System, the eccentric distance are the distance between cable connector eccentric point and cable connector cross-section center point, the cable connector
The degree of eccentricity is cable connector eccentric point and two thermometric dresses in the line and every group of temperature measuring equipment of cable connector cross-section center point
Put the angle of installation site line formation；
S4, the surface temperature for measuring each point for measuring temperature, according to cable connector eccentric distance, eccentric angle and temperature deviation it
Between functional relation obtain cable connector eccentric distance.
Particularly, step S3 includes：
Temperature deviation under S31, measurement cable connector difference eccentric distance, different eccentric angles, obtains different eccentric angles
Under degree, the linear relationship curve of eccentric distance and temperature deviation,；
S32, the linear relationship slope of curve by curve matching acquisition eccentric distance and temperature deviation, eccentric angle, temperature
Functional relation between degree deviation, between the linear relationship slope of curve, eccentric distance with reference to eccentric distance and temperature deviation
Functional relation, obtains eccentric distance, the functional relation between eccentric angle and temperature deviation.
Particularly, step S4 includes：
S41, the surface temperature for measuring each point for measuring temperature, calculate the temperature deviation of every group of temperature measuring equipment；
Cable connector cross-sectional area is divided into N number of region by S42, the line of every group of measurement apparatus, according to every group of thermometric dress
The temperature deviation put, determines the region that cable connector eccentric point is present, is defined as eccentric region；
First group of thermometric in the line and eccentric region of S43, cable connector eccentric point and cable connector cross-section center point
The angle of device installation site line is defined as the first eccentric angle θ 1, cable connector eccentric point and cable connector cross-section center
The angle of second group of temperature measuring equipment installation site line of line and eccentric region of point is defined as the second eccentric angle θ 2, with reference to electricity
Cable joint eccentric distance, the functional relation between eccentric angle and temperature deviation, the first eccentric angle θ 1, eccentric distance of calculating,
Between functional relation between first group of temperature deviation, and the second eccentric angle θ 2, eccentric distance, second group of temperature deviation
Functional relation；
S44, calculating eccentric region angle [alpha],α=θ 1+ θ 2, it is warm with reference to first group of temperature deviation and second group
Degree deviation, obtains cable connector eccentric distance.
Particularly, N=8.
Particularly, the temperature measuring equipment reaches 0.01 DEG C of temperature sensor using display virtual value.
Particularly, led directly to using the XLPE power cables cold-contraction type of 8.7/15kV YJV 1 × 400 in step S3 and connect
Head is modeled to cable connector.
The present invention compared with prior art, has the following advantages and advantages：
The measuring method of cable connector eccentric distance of the present invention, can realize to the accurate of cable connector eccentric distance
Measurement, so as to avoid that eccentric cable connector is applied in power circuit, reduces cable connector accident rate, ensures power system
Safe operation.Meanwhile, the method also have it is simple to operate, with low cost, the characteristics of easily realization.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the measuring method flow chart of the cable connector eccentric distance that the embodiment of the present invention 1 is provided.
Fig. 2 is the cable connector cross-sectional structure schematic diagram that the embodiment of the present invention 1 is provided.
When Fig. 3 is 22.5 ° for the cable connector eccentric angle that the embodiment of the present invention 1 is provided, every group of temperature measuring equipment temperature is inclined
Difference and eccentric distance corresponding relation curve map.
When Fig. 4 is 30 ° for the cable connector eccentric angle that the embodiment of the present invention 1 is provided, every group of temperature measuring equipment temperature deviation
With eccentric distance corresponding relation curve map.
When Fig. 5 is 90 ° for the cable connector eccentric angle that the embodiment of the present invention 1 is provided, every group of temperature measuring equipment temperature deviation
With eccentric distance corresponding relation curve map.
Fig. 6 be cable connector eccentric distance and temperature deviation that the embodiment of the present invention 1 is provided the linear relationship slope of curve,
Eccentric angle corresponding relation curve map.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and the exemplary embodiment of the present invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
The present embodiment illustrates that so that the external boundary in cable connector cross section is uniformly arranged 8 points for measuring temperature as an example measuring cable connects
The method of head eccentric distance.
As shown in figure 1, Fig. 1 is the measuring method flow chart of the cable connector eccentric distance that the embodiment of the present invention 1 is provided.
The measuring method of the cable connector eccentric distance specifically includes following steps：
S1, the external boundary in cable connector cross section are uniformly arranged 8 points for measuring temperature, and each point for measuring temperature arranges a thermometric dress
Put.
As shown in Fig. 2 Fig. 2 is the cable connector cross-sectional structure schematic diagram that the embodiment of the present invention 1 is provided.
External boundary in cable connector cross section is uniformly arranged 8 points for measuring temperature, and each point for measuring temperature arranges a temperature measuring equipment,
S1, S2, S3, S4, S5, S6, S7, S8 are respectively defined as, the temperature measuring equipment obtains the surface temperature of correspondence point for measuring temperature, fixed respectively
Justice is T1, T2, T3, T4, T5, T6, T7, T8.
S2, temperature measuring equipment is grouped, installation site line through two temperature measuring equipments of cable connector cross-section center is
One group, per group in the measurement of two temperature measuring equipments Temperature numerical difference absolute value as this group of temperature deviation.
The central point of cable connector cross section is defined as O, fills according to two thermometrics of the installation site line through central point O
Be set to one group of principle, temperature measuring equipment be grouped, obtain four groups of temperature measuring equipments, wherein, S1, S5 be first group of temperature measuring equipment, S2,
S6 is second group of temperature measuring equipment, and S3, S7 are the 3rd group of temperature measuring equipment, and S4, S8 are the 4th group of temperature measuring equipment.Wherein, S1, S5 measurement
Temperature numerical T1, T5 difference absolute value be first group of temperature measuring equipment temperature deviation, be defined as Δ T1；S2, S6 measurement
The absolute value of the difference of Temperature numerical T2, T6 is second group of temperature measuring equipment temperature deviation, is defined as Δ T2；The temperature of S3, S7 measurement
The absolute value of the difference of number of degrees value T3, T7 is the 3rd group of temperature measuring equipment temperature deviation, is defined as Δ T3；The temperature of S4, S8 measurement
The absolute value of the difference of numerical value T4, T8 is the 4th group of temperature measuring equipment temperature deviation, is defined as Δ T4；
S3, cable connector is modeled, obtain cable connector eccentric distance, function between eccentric angle and temperature deviation and close
System, the eccentric distance are the distance between cable connector eccentric point and cable connector cross-section center point, the cable connector
The degree of eccentricity is cable connector eccentric point and two thermometric dresses in the line and every group of temperature measuring equipment of cable connector cross-section center point
Put the angle of installation site line formation.
Cable connector is modeled using Comsol Multiphysics softwares.
Cable connector eccentric point is defined as into P, eccentric distance is the distance between eccentric point P and central point O, eccentric angle
For the angle that two temperature measuring equipment installation site lines in line and every group of temperature measuring equipment of eccentric point P with central point O are formed.When
Cable connector eccentric angle be 22.5 ° when, respectively measure eccentric distance be 2mm, 4mm, 6mm, 8mm, during 10mm, T1, T2, T3,
The numerical value of T4, T5, T6, T7, T8, so as to calculate corresponding Δ T1, Δ T2, Δ T3, Δ T4 numerical value, obtains bent as shown in Figure 3
Line chart, Fig. 3 is the cable connector eccentric angle that the embodiment of the present invention 1 is provided when being 22.5 °, every group of temperature measuring equipment temperature deviation with
Eccentric distance corresponding relation curve map.Wherein, curve Q31 is first group and second group of temperature measuring equipment curve, and slope is defined as
K31；Curve Q32 is the 3rd group and the 4th group of temperature measuring equipment curve, and slope is defined as K32.In the same manner, when cable connector eccentric angle
For 30 ° when, respectively measure eccentric distance be 2mm, 4mm, 6mm, 8mm, during 10mm, the number of T1, T2, T3, T4, T5, T6, T7, T8
Value, so as to calculate corresponding Δ T1, Δ T2, Δ T3, Δ T4 numerical value, obtains curve as shown in Figure 4, and Fig. 4 is present invention enforcement
When the cable connector eccentric angle that example 1 is provided is 30 °, every group of temperature measuring equipment temperature deviation and eccentric distance corresponding relation curve
Figure.Wherein, curve Q41 is second group of temperature measuring equipment curve, and slope is defined as K41；Curve Q42 is that first group of temperature measuring equipment is bent
Line, slope are defined as K42；Curve Q43 is the 3rd group of temperature measuring equipment curve, and slope is defined as K43；Curve Q44 is the 4th group of survey
Warm device curve, slope are defined as K4.In the same manner, when cable connector eccentric angle is 90 °, it is 2mm to measure eccentric distance respectively,
When 4mm, 6mm, 8mm, 10mm, the numerical value of T1, T2, T3, T4, T5, T6, T7, T8, so as to calculate corresponding Δ T1, Δ T2, Δ
T3, Δ T4 numerical value, obtain curve map as shown in Figure 5, and it is 90 ° that Fig. 5 is the cable connector eccentric angle that the embodiment of the present invention 1 is provided
When, every group of temperature measuring equipment temperature deviation and eccentric distance corresponding relation curve map.Wherein, curve Q51 is first group and the 3rd group
Temperature measuring equipment curve, slope are defined as K51；Curve Q52 is second group and the 4th group of temperature measuring equipment curve, and slope is defined as K52.
It should be noted that can as needed, in the case of measuring other different eccentric angles, eccentric distance, each temperature measuring equipment
Temperature numerical.
The curve of above-mentioned acquisition is carried out curve fitting, the linear relationship of cable connector eccentric distance and temperature deviation is obtained
Functional relation between the slope of curve, eccentric angle, temperature deviation is θ=- 3.539 × 104×K2-929.9(ΔT/2)+
87.79, wherein, θ is cable connector eccentric angle, and K is that cable connector eccentric distance is oblique with the linear relationship curve of temperature deviation
Rate, Δ T are temperature of cable junction deviations.As shown in fig. 6, Fig. 6 be the embodiment of the present invention 1 provide cable connector eccentric distance with
The linear relationship slope of curve of temperature deviation, eccentric angle corresponding relation curve map.
S4, the surface temperature for measuring each point for measuring temperature of cable under test joint, according to cable connector eccentric distance, eccentric angle
Functional relation and temperature deviation between obtains cable under test joint eccentric distance.
Surface temperature T1, T2, the numerical value of T3, T4, T5, T6, T7, T8 of each point for measuring temperature of cable under test joint are measured, from
And calculate corresponding Δ T1, Δ T2, Δ T3, Δ T4 numerical value.The line of every group of measurement apparatus is by cable under test joint cross section
Be divided into 8 size identical regions, the line between line, S2 and central point O, S1 and S2 between S1 and central point O it
Between circular arc between surround region 1, the line between line, S3 and central point O between S2 and central point O, between S2 and S3
Circular arc between surround region 2 ... by that analogy, until the line between S8 and central point O, the company between S1 and central point O
Region 8 is surrounded between circular arc between line, S8 and S1.From cable connector heating principle, cable connector eccentric point P temperature is inclined
The region that two groups of big temperature measuring equipments of difference are surrounded, and two groups of big temperature measuring equipments of temperature deviation are adjacent.Surveyed with cable under test joint
The Temperature numerical of amount be T1=48 DEG C, T2=47 DEG C, T3=49 DEG C, T4=51 DEG C, T5=51 DEG C, T6=51 DEG C, T7=47 DEG C,
As a example by T8=50 DEG C, T1=3 DEG C of Δ, T2=4 DEG C of Δ, T3=2 DEG C of Δ, T4=1 DEG C of Δ are calculated, so as to judge that eccentric point P is located at
The eccentric angle of P and first group of temperature measuring equipment is defined as θ 1 by region 1, and the eccentric angle of P and second group of temperature measuring equipment is defined
For θ 2, the linear relationship slope of curve according to cable connector eccentric distance and temperature deviation, between eccentric angle, temperature deviation
Function #=- 3.539 × 104×K2- 929.9 (Δ T/2)+87.79, then have θ 1=-3.539 × 104×K12-929.9(ΔT1/
2)+87.79, θ 2=-3.539 × 104×K22- 929.9 (Δ T2/2)+87.79, wherein, K1 is first group of temperature measuring equipment temperature
Deviation and the eccentric distance corresponding relation slope of curve, K2 is second group of temperature measuring equipment temperature deviation and eccentric distance corresponding relation
Cable connector eccentric distance is defined as x by the slope of curve, and first group of temperature measuring equipment position coordinate is (x, dt1), first group
Temperature measuring equipment position coordinate is (x, dt2), then K1=dt1/x, K2=dt2/x, Δ T1, Δ T2, it is known that while, eccentric area
Domain angle [alpha]=(360/8) °=45 °, and α=θ 1+ θ 2, so as to the eccentric distance x of cable under test joint can be obtained.
It should be noted that the point for measuring temperature quantity that the external boundary of cable connector cross section is arranged accordingly can be set as needed
It is set to other even numbers.
The preferred embodiment of the present embodiment is that the temperature measuring equipment is passed using the temperature that display virtual value reaches 0.01 DEG C
Sensor.
The preferred embodiment of the present embodiment is the XLPE power cables in step S3 using 8.7/15kV YJV 1 × 400
Cold-contraction type straight coupling is modeled to cable connector.
Technical scheme obtains cable connector transversal in the external boundary arrangement temperature measuring equipment of cable connector cross section
Face profiling temperatures.Cable connector is modeled, cable connector eccentric distance, the letter between eccentric angle and temperature deviation is obtained
Number relation.According to the Temperature numerical of the cable under test joint of each temperature measuring equipment measurement, the accurate of cable connector eccentric distance is obtained
Numerical value.So as to realize the accurate measurement to cable connector eccentric distance, it is to avoid eccentric cable connector is applied to power circuit
In, cable connector accident rate is reduced, the safe operation of power system is ensured.Meanwhile, the method also has simple to operate, low cost
It is honest and clean, the characteristics of easily realization.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, the be should be understood that specific embodiment that the foregoing is only the present invention is not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. all should include
Within protection scope of the present invention.
Claims (6)
1. a kind of measuring method of cable connector eccentric distance, it is characterised in that comprise the following steps：
S1, the external boundary in cable connector cross section are uniformly arranged N number of point for measuring temperature, and each point for measuring temperature arranges a temperature measuring equipment, N
For even number；
S2, temperature measuring equipment is grouped, installation site line is one group through two temperature measuring equipments of cable connector cross-section center,
In per group, the absolute value of the difference of the Temperature numerical of two temperature measuring equipment measurements is used as this group of temperature deviation；
S3, to cable connector model, obtain cable connector eccentric distance, the functional relation between eccentric angle and temperature deviation,
The eccentric distance is the distance between cable connector eccentric point and cable connector cross-section center point, and the cable connector is eccentric
Spend is that cable connector eccentric point is pacified with two temperature measuring equipments in the line and every group of temperature measuring equipment of cable connector cross-section center point
The angle that holding position line is formed；
S4, the surface temperature for measuring each point for measuring temperature of cable under test joint, according to cable connector eccentric distance, eccentric angle and temperature
Functional relation between degree deviation obtains cable under test joint eccentric distance.
2. the measuring method of cable connector eccentric distance according to claim 1, it is characterised in that the step S3 bag
Include：
Temperature deviation under S31, measurement cable connector difference eccentric distance, different eccentric angles, obtains under different eccentric angles,
The linear relationship curve of eccentric distance and temperature deviation；
S32, the linear relationship slope of curve by curve matching acquisition eccentric distance and temperature deviation, eccentric angle, temperature are inclined
Functional relation between difference, the function between the linear relationship slope of curve, eccentric distance with reference to eccentric distance and temperature deviation
Relation, obtains eccentric distance, the functional relation between eccentric angle and temperature deviation.
3. the measuring method of cable connector eccentric distance according to claim 1, it is characterised in that the step S4 bag
Include：
S41, the surface temperature for measuring each point for measuring temperature of cable under test joint, calculate the temperature deviation of every group of temperature measuring equipment；
Cable connector cross-sectional area is divided into N number of region by S42, the line of every group of measurement apparatus, according to every group of temperature measuring equipment
Temperature deviation, determines the region that cable connector eccentric point is present, is defined as eccentric region；
First group of temperature measuring equipment in the line and eccentric region of S43, cable connector eccentric point and cable connector cross-section center point
The angle of installation site line is defined as the first eccentric angle θ 1, cable connector eccentric point and cable connector cross-section center point
The angle of second group of temperature measuring equipment installation site line of line and eccentric region is defined as the second eccentric angle θ 2, connects with reference to cable
Head eccentric distance, the functional relation between eccentric angle and temperature deviation, calculate the first eccentric angle θ 1, eccentric distance, first
Functional relation between group temperature deviation, and the function between the second eccentric angle θ 2, eccentric distance, second group of temperature deviation
Relation；
S44, calculating eccentric region angle [alpha],α=θ 1+ θ 2, it is inclined with reference to first group of temperature deviation and second group of temperature
Difference, obtains cable connector eccentric distance.
4. the measuring method of the cable connector eccentric distance as described in claims 1 to 3 is arbitrary, it is characterised in that N=8.
5. the measuring method of the cable connector eccentric distance as described in claims 1 to 3 is arbitrary, it is characterised in that the thermometric
Device reaches 0.01 DEG C of temperature sensor using display virtual value.
6. the measuring method of the cable connector eccentric distance as described in claims 1 to 3 is arbitrary, it is characterised in that the step
XLPE power cable cold-contraction type straight couplings in S3 using 8.7/15kV YJV 1 × 400 are modeled to cable connector.
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| CN201611042670.5A CN106524983B (en) | 2016-11-21 | 2016-11-21 | A kind of measurement method of cable connector eccentric distance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611042670.5A CN106524983B (en) | 2016-11-21 | 2016-11-21 | A kind of measurement method of cable connector eccentric distance |
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Citations (4)
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| JPH0510705A (en) * | 1991-07-08 | 1993-01-19 | Hitachi Ltd | Rotary shaft eccentricity detector |
| WO2009049589A1 (en) * | 2007-10-15 | 2009-04-23 | V & M Deutschland Gmbh | Method and apparatus for measuring the eccentricity of a hot-fabricated seamless tube during production |
| CN103644884A (en) * | 2013-12-30 | 2014-03-19 | 国家电网公司 | Power cable connector construction normalization detection method based on temperature measurement |
| CN204329942U (en) * | 2015-01-21 | 2015-05-13 | 重庆大学 | Cable splice eccentricity detection system |
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2016
- 2016-11-21 CN CN201611042670.5A patent/CN106524983B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0510705A (en) * | 1991-07-08 | 1993-01-19 | Hitachi Ltd | Rotary shaft eccentricity detector |
| WO2009049589A1 (en) * | 2007-10-15 | 2009-04-23 | V & M Deutschland Gmbh | Method and apparatus for measuring the eccentricity of a hot-fabricated seamless tube during production |
| CN103644884A (en) * | 2013-12-30 | 2014-03-19 | 国家电网公司 | Power cable connector construction normalization detection method based on temperature measurement |
| CN204329942U (en) * | 2015-01-21 | 2015-05-13 | 重庆大学 | Cable splice eccentricity detection system |
Non-Patent Citations (1)
| Title |
|---|
| 王爽 等: "电缆接头偏心距离测量电路及方法", 《中国科技纵横》 * |
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