CN113701651A

CN113701651A - Cable insulation core size detection method, device and system

Info

Publication number: CN113701651A
Application number: CN202111219444.0A
Authority: CN
Inventors: 房晟辰; 于洋; 李旭; 邢向上; 张军; 徐科; 张弛; 张春晖; 李松原; 范巍
Original assignee: State Grid Tianjin Electric Power Co Ltd; Electric Power Research Institute of State Grid Tianjin Electric Power Co Ltd
Current assignee: State Grid Tianjin Electric Power Co Ltd; Electric Power Research Institute of State Grid Tianjin Electric Power Co Ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2021-11-26

Abstract

The invention discloses a method, a device and a system for detecting the size of a cable insulated wire core, wherein the method comprises the following steps: the method comprises the steps of collecting a cross-section front view image of a cable to be detected, obtaining a measurement point coordinate and an intersection point coordinate of each phase wire core of the cable in the cross-section front view image, calculating an actual value of an insulation thickness parameter of each phase wire core according to a pixel distance between the measurement point coordinate and the intersection point coordinate of each phase wire core, comparing the actual value of the insulation thickness parameter of each phase wire core with a standard cable insulation thickness parameter, and further obtaining a cable insulation thickness detection result of the cable to be detected. According to the invention, the size of the insulated wire core of the cable can be rapidly detected, a cable sample does not need to be sent to a detection mechanism for detection, and the detection efficiency of the size of the insulated wire core of the cable is effectively improved, so that the comprehensive insulation detection of all the cables to be laid in a cable laying field is realized, the cables with unqualified insulated wire cores are prevented from entering a power grid, and the safety of power grid equipment is ensured.

Description

Cable insulation core size detection method, device and system

Technical Field

The invention relates to the technical field of cable detection, in particular to a method, a device and a system for detecting the size of a cable insulation core.

Background

The cable is an important device for power transmission and transformation of a power system, and plays an indispensable role in safe power load and reliable power transmission. Since the insulation properties of the cable are critical to the operation of the power system, the insulation properties of the cable must be checked before laying the cable.

Among the prior art, usually extract the cable drum with certain proportion to the cable of purchase, intercept one section cable sample and send to detection mechanism and carry out insulation detection from the cable drum, its work flow is: sampling-submission-detection-reporting. However, the inventor researches and discovers that the existing cable insulation wire core size detection technology is long in detection time, detection results cannot meet requirements of construction progress frequently, a large number of cables are laid without detection, and potential safety hazards are caused to safe and reliable operation of a power system.

Disclosure of Invention

The invention provides a method, a device and a system for detecting the size of a cable insulated wire core, which aim to solve the technical problem of low efficiency of the existing detection of the size of the cable insulated wire core.

In order to achieve the above object, an embodiment of the present invention provides a method for detecting a size of an insulated wire core of a cable, including:

collecting a cross-section elevation image of a cable to be measured;

constructing a plane coordinate system related to the section elevation image to obtain a pixel distance between two end points of a standard ruler in the section elevation image, and taking a ratio of an actual distance between the two end points of the standard ruler to the pixel distance as a conversion ratio between the actual distance and the pixel distance;

respectively appointing n measuring points at the inner side of the insulation of each phase wire core of the cable in the cross-section front view image so as to obtain a measuring point coordinate set of each phase wire core, obtaining the circle center of the corresponding phase wire core and the coordinates of the circle center through the fitting of the measuring point coordinate set, and respectively taking rays from the circle center to the n measuring points in each phase wire core so as to obtain n intersection point coordinates of the rays in the phase wire core and the outer side of the insulation;

calculating a first pixel distance between the coordinate of the measuring point in each phase wire core and the coordinates of the n intersection points outside the insulation, and calculating an actual value of the insulation thickness parameter of each phase wire core according to the first pixel distance and the conversion ratio;

and comparing the actual value of the insulation thickness parameter of each phase wire core with the insulation thickness parameter of the standard cable to obtain a cable insulation thickness detection result of the cable to be detected.

As an improvement of the above, the method further comprises:

acquiring n intersection point coordinates of rays in each phase of wire core and the outer side of the insulation shield;

calculating a second pixel distance between the n intersection point coordinates outside the insulation and the n intersection point coordinates outside the insulation shielding in each phase wire core, and calculating an actual value of the insulation shielding parameter of each phase wire core according to the second pixel distance and the conversion proportion;

and comparing the actual value of the insulation shielding parameter of each phase wire core with the insulation shielding parameter of the standard cable to obtain a cable insulation shielding detection result of the cable to be detected.

As an improvement of the above, the method further comprises:

in each phase wire core, rays are respectively taken from the n measuring points to the circle center so as to obtain n intersection point coordinates of the rays in the phase wire core and the inner side of the conductor shield;

calculating a third pixel distance between the coordinate of the measuring point in each phase wire core and the coordinates of n intersection points at the inner side of the conductor shield, and calculating an actual value of the conductor shield parameter of each phase wire core according to the third pixel distance and the conversion proportion;

and comparing the actual value of the conductor shielding parameter of each phase wire core with the conductor shielding parameter of the standard cable to obtain a cable conductor shielding detection result of the cable to be detected.

As an improvement of the above, the method further comprises:

obtaining a circle and the radius of the circle by coordinate fitting of n intersection points on the inner side of the conductor shield;

calculating to obtain an actual value of the sectional area of each phase conductor wire core according to the radius of the circle and the conversion ratio;

and comparing the actual value of the section area of each phase of conductor wire core with the section area parameters of the standard conductor wire core to obtain the detection result of the section area of the conductor wire core of the cable to be detected.

As an improvement of the above scheme, the acquiring a cross-sectional elevation image of the cable to be measured specifically includes:

opening a protection piece at any end of the cable to be tested to expose the cable section, or cutting the cable section on any section of the cable to be tested;

fixing the cable to be tested through a fixing bracket, fixing an electronic terminal through an electronic terminal bracket, and fixing the fixing bracket and the electronic terminal bracket on the same horizontal plane through bracket fixing bolts;

and adjusting the positions of the fixing support and the electronic terminal support to enable the front surface of the section of the cable to be detected to face the camera of the electronic terminal, and acquiring the front sectional view image of the cable to be detected by utilizing the camera.

As an improvement of the above scheme, in each phase core, rays are taken from the center of circle to n measurement points respectively to obtain n intersection point coordinates of the rays in the phase core and the outside of the insulating part, specifically including:

in each phase wire core, respectively making rays from the center of the circle to n measuring points;

acquiring coordinates of n intersection points of rays in the phase conductor core and the outer side of the insulating part by an image identification method; when the image is identified, the colors of the inner side of the insulating part and the outer side of the insulating part of the wire core are different, so that the intersection point coordinate of the outer side of the insulating part can be rapidly acquired.

As an improvement of the above, the insulation thickness parameters include an insulation average thickness, an insulation maximum thickness, an insulation minimum thickness, and an insulation eccentricity.

As an improvement of the above scheme, the calculating a first pixel distance between the coordinate of the measurement point and the coordinate of the intersection point in each phase wire core, and calculating an actual value of the insulation thickness parameter of each phase wire core according to the first pixel distance and the conversion ratio specifically includes:

calculating a first pixel distance between the coordinates of the n measuring points in each phase wire core and the coordinates of the intersection point

(ii) a Wherein i represents the phase of the cable cores to be tested, i = 1.. and m represents the number of the cable cores to be tested;

according to the first pixel distance

The conversion ratio and the formula

Calculating to obtain an actual value of the average insulation thickness of each phase wire core; wherein the content of the first and second substances,

an actual value representing the insulation average thickness of the i-th phase, k represents a conversion ratio,

，d_lenrepresenting the actual distance between two end points of the gauge, d_pxRepresenting the pixel distance between two end points of the standard ruler;

according to the first pixel distance

The conversion ratio and the formula

、

Calculating to obtain an actual value of the minimum insulation thickness and an actual value of the maximum insulation thickness of each phase of the wire core; wherein the content of the first and second substances,

an actual value representing the insulation minimum thickness of the i-th phase;

an actual value representing the maximum thickness of insulation of the i-th phase;

according to the first pixel distance

The conversion ratio and the formula

Calculating to obtain an actual value of the insulation eccentricity of each phase wire core; wherein the content of the first and second substances,

an actual value of insulation eccentricity of the i-th phase is indicated.

The embodiment of the invention also provides a device for detecting the size of the insulated wire core of the cable, which comprises:

the acquisition module is used for acquiring a cross-section elevation image of the cable to be detected;

the construction module is used for constructing a plane coordinate system related to the cross-section front view image so as to obtain a pixel distance between two end points of a standard ruler in the cross-section front view image, and a ratio of an actual distance between the two end points of the standard ruler to the pixel distance is used as a conversion ratio between the actual distance and the pixel distance;

the acquisition module is used for respectively appointing n measuring points to the inner side of the insulation of each phase wire core of the cable in the cross-section front view image so as to acquire a measuring point coordinate set of each phase wire core, obtaining the circle center of the corresponding phase wire core and the coordinates of the circle center through the fitting of the measuring point coordinate set, and respectively taking rays from the circle center to the n measuring points in each phase wire core so as to acquire n intersection point coordinates of the rays in the phase wire core and the outer side of the insulation;

the calculation module is used for calculating a first pixel distance between the coordinate of the measuring point in each phase wire core and the coordinates of n intersection points outside the insulation, and calculating an actual value of the insulation thickness parameter of each phase wire core according to the first pixel distance and the conversion proportion;

and the comparison module is used for comparing the actual value of the insulation thickness parameter of each phase wire core with the insulation thickness parameter of the standard cable to obtain a cable insulation thickness detection result of the cable to be detected.

The embodiment of the invention also provides a system for detecting the size of the insulated wire core of the cable, which comprises a fixed support, a standard ruler support, an electronic terminal and an upper computer;

the fixing support is provided with a plurality of cable fixing threaded holes and a plurality of support fixing holes, and a cable to be detected is fixed inside the fixing support through the cable fixing threaded holes by a cable fixing bolt;

a standard ruler is fixed on the standard ruler support, and a plurality of support fixing holes are formed in the standard ruler support;

an electronic terminal is fixed on the electronic terminal support, and a plurality of support fixing holes are formed in the electronic terminal support;

the fixed support, the standard ruler support and the electronic terminal support are fixed on the same horizontal plane through the support fixing holes by support fixing bolts;

the upper computer is connected with the electronic terminal and is the size detection device for the cable insulation wire core.

Compared with the prior art, the method, the device and the system for detecting the size of the insulated wire core of the cable provided by the embodiment of the invention have the beneficial effects that: the cross-section front view image of the cable to be detected is acquired on site, the measuring point coordinates and the intersection point coordinates of each phase core of the cable in the cross-section front view image are acquired, the actual value of the insulation thickness parameter of each phase core is obtained through calculation according to the pixel distance between the measuring point coordinates and the intersection point coordinates of each phase core, the actual value of the insulation thickness parameter of each phase core is compared with the insulation thickness parameter of a standard cable, the cable insulation thickness detection result of the cable to be detected is further obtained, the insulation thickness of the cable can be rapidly detected, the cable sample intercepted from an extracted cable drum does not need to be sent to a detection mechanism for detection, and the detection efficiency of the insulation thickness of the cable is effectively improved. This embodiment can also carry out short-term test to the sectional area of the insulation shield of cable, conductor shield and conductor sinle silk to the realization is treated the cabling in the cable laying field and is carried out comprehensive insulation size and detect, prevents that the unqualified cable of insulation size from getting into the electric wire netting, guarantee electric wire netting equipment safety.

Drawings

FIG. 1 is a schematic flow chart of a method for detecting the size of an insulated wire core of a cable according to a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a cable to be tested in a preferred embodiment of a method for detecting the size of an insulated wire core of the cable provided by the invention;

FIG. 3 is a schematic structural diagram of a preferred embodiment of a cable insulated wire core size detection device provided by the invention;

FIG. 4 is a schematic structural diagram of a preferred embodiment of a cable insulated wire core dimension detection system provided by the invention;

FIG. 5 is a schematic structural diagram of a fixing bracket in a preferred embodiment of a cable insulated wire core size detection system provided by the invention;

FIG. 6 is a schematic structural diagram of a standard ruler support in a preferred embodiment of a cable insulated wire core dimension detection system provided by the invention;

FIG. 7 is a schematic structural diagram of an electronic terminal bracket in a preferred embodiment of a cable insulated wire core dimension detection system provided by the invention;

fig. 8 is a schematic structural diagram of a preferred embodiment of a terminal device provided in the present invention;

wherein the reference numbers are as follows:

1. fixing a bracket; 101. a cable fixing threaded hole; 2. a standard ruler support; 201. a standard ruler; 3. an electronic terminal support; 4. an electronic terminal; 5. a cable to be tested; 6. and a bracket fixing hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic flow chart of a method for detecting a dimension of an insulated wire core of a cable according to a preferred embodiment of the present invention. The method for detecting the size of the insulated wire core of the cable comprises the following steps:

s1, acquiring a cross-section front view image of the cable to be measured;

s2, constructing a plane coordinate system related to the section elevation image to obtain a pixel distance between two end points of a standard ruler in the section elevation image, and taking the ratio of the actual distance between the two end points of the standard ruler to the pixel distance as a conversion ratio between the pixel distance and the actual distance;

s3, respectively appointing n measuring points to the inner side of the insulation of each phase wire core of the cable in the cross-section front view image so as to obtain a measuring point coordinate set of each phase wire core, obtaining the circle center of the corresponding phase wire core and the coordinates of the circle center through the fitting of the measuring point coordinate set, and respectively taking rays from the circle center to the n measuring points in each phase wire core so as to obtain n intersection point coordinates of the rays in the phase wire core and the outer side of the insulation;

s4, calculating a first pixel distance between the coordinate of the measuring point in each phase wire core and the coordinates of n intersection points outside the insulation, and calculating to obtain an actual value of the insulation thickness parameter of each phase wire core according to the first pixel distance and the conversion ratio;

and S5, comparing the actual value of the insulation thickness parameter of each phase wire core with the insulation thickness parameter of the standard cable to obtain a cable insulation thickness detection result of the cable to be detected.

Specifically, in this embodiment, a cross-sectional front view image of the cable to be measured is first acquired, and a plane coordinate system related to the cross-sectional front view image is constructed to obtain a pixel distance d between two end points of the gauge in the cross-sectional front view image_pxCalculating the actual distance d between two end points of the standard ruler_lenAnd a pixel distance d_pxAs a scaling k between the actual distance and the pixel distance, i.e. the ratio between

(ii) a Then, determining the number m of the cable cores to be tested,respectively appointing n measuring points at the inner side of the insulation part of each phase wire core of the cable in the cross-section front view image to obtain a measuring point coordinate set of each phase wire core, obtaining the circle center of the corresponding phase wire core and the coordinates of the circle center through the fitting of the measuring point coordinate set, respectively taking rays from the circle center to the n measuring points in each phase wire core, and obtaining n intersection point coordinates of the rays in the phase wire core and the outer side of the insulation part by adopting an image recognition method; calculating a first pixel distance between a coordinate of a measuring point in each phase wire core and coordinates of n intersection points outside the insulating part, and calculating an actual value of an insulation thickness parameter of each phase wire core according to the first pixel distance and a conversion ratio; and finally, comparing the actual value of the insulation thickness parameter of each phase wire core with the insulation thickness parameter of the standard cable to obtain a cable insulation thickness detection result of the cable to be detected and form a detection result report.

According to the embodiment, the cross-section elevation image of the cable to be detected is acquired on site, the measurement point coordinates and the intersection point coordinates of each phase core of the cable in the cross-section elevation image are acquired, the actual value of the insulation thickness parameter of each phase core is obtained through calculation according to the pixel distance between the measurement point coordinates and the intersection point coordinates of each phase core, the actual value of the insulation thickness parameter of each phase core is compared with the standard cable insulation thickness parameter, the cable insulation thickness detection result of the cable to be detected is further obtained, the insulation thickness of the cable can be rapidly detected, the cable sample intercepted from the extracted cable reel does not need to be sent to a detection mechanism for detection, the detection efficiency of the insulation thickness of the cable is effectively improved, the cable with unqualified insulation thickness is prevented from entering a power grid, and the safety of power grid equipment is guaranteed.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a cable to be tested in a preferred embodiment of a method for detecting a size of an insulated wire core of the cable provided by the present invention, where the cable to be tested sequentially includes a conductor wire core, a conductor shield, an insulation and an insulation shield from inside to outside.

In another preferred embodiment, the method further comprises:

Specifically, the embodiment obtains coordinates of n intersection points of the ray in each phase of the wire core and the outer side of the insulation shield; calculating a second pixel distance between the coordinates of the n intersection points outside the insulation and the coordinates of the n intersection points outside the insulation shield in each phase wire core

Wherein i represents the phase of the cable cores to be tested, i = 1. According to the second pixel distance

Conversion ratio k and formula

，

Calculating actual values of the average thickness of the insulation shield, the minimum thickness of the insulation shield and the maximum thickness of the insulation shield of each phase wire core; wherein k represents a conversion ratio,

an actual value representing the average thickness of the insulation shield of the i-th phase;

an actual value representing a minimum thickness of the insulation shield of the i-th phase;

representing the actual value of the maximum thickness of the insulation shield for the i-th phase. And comparing the actual value of the insulation shielding parameter of each phase wire core with the insulation shielding parameter of the standard cable to obtain a cable insulation shielding detection result of the cable to be detected.

In another preferred embodiment, the method further comprises:

Specifically, in this embodiment, rays are taken from n measurement points to the center of a circle in each phase core, so as to obtain n intersection point coordinates of the rays in the phase core and the inner side of the conductor shield (i.e., the outer side of the conductor core); calculating a third pixel distance between the coordinate of the measuring point in each phase wire core and the coordinates of n intersection points inside the conductor shield

Wherein i represents the phase of the cable cores to be tested, i = 1. According to the third pixel distance

Conversion ratio k and formula

，

Calculating actual values of the average thickness of the conductor shield, the minimum thickness of the conductor shield and the maximum thickness of the conductor shield of each phase wire core; wherein the content of the first and second substances,

an actual value representing an average thickness of the conductor shield of the i-th phase;

an actual value representing a minimum thickness of the conductor shield of the i-th phase;

the actual value representing the maximum thickness of the conductor shield for the i-th phase. And comparing the actual value of the conductor shielding parameter of each phase wire core with the standard cable conductor shielding parameter to obtain a cable conductor shielding detection result of the cable to be detected.

In another preferred embodiment, the method further comprises:

Specifically, in this embodiment, a circle and a radius of the circle are obtained by fitting coordinates of n intersection points inside the conductor shield, the area of the circle is used as the sectional area of the conductor core, and then the actual value of the sectional area of each phase of the conductor core is calculated according to the radius of the circle and the conversion ratio k

. Comparing the actual value of the section area of each phase of conductor wire core with the section area parameters of the standard conductor wire core to obtain the conductor wire core section of the cable to be testedAnd (5) area detection results.

In another preferred embodiment, the step S1 of acquiring a cross-sectional front view image of the cable to be tested specifically includes:

s101, opening a protection piece at any end of a cable to be tested to expose the cable section, or cutting out the cable section on any section of the cable to be tested;

s102, fixing the cable to be tested through a fixing support, fixing an electronic terminal through an electronic terminal support, and fixing the fixing support and the electronic terminal support on the same horizontal plane through support fixing bolts;

s103, adjusting the positions of the fixing support and the electronic terminal support to enable the front face of the cross section of the cable to be detected to face the camera of the electronic terminal, and collecting the cross section front view image of the cable to be detected by utilizing the camera.

Specifically, in the embodiment, when acquiring the cross-sectional front view image of the cable to be tested, the protection element at any end of the cable to be tested is firstly opened to expose the cable cross section, or the cable cross section is cut out from any section of the cable to be tested; the cable to be tested is fixed through a fixing support, the electronic terminal is fixed through an electronic terminal support, and the fixing support and the electronic terminal support are fixed on the same horizontal plane through support fixing bolts, so that the electronic terminal can acquire a cross-sectional image of the cable to be tested; and adjusting the positions of the fixing support and the electronic terminal support to enable the front side of the section of the cable to be measured to face the camera of the electronic terminal, and acquiring a front view image of the section of the cable to be measured by using the camera.

It should be noted that, in this embodiment, the standard ruler is fixed on the standard ruler support, and the standard ruler support is fixed on the same horizontal plane with the fixing support and the electronic terminal support through the support fixing bolt, and the standard ruler support can be fixed at the cross section of the cable to be measured by adjusting the position of the standard ruler support on the support fixing bolt.

In another preferred embodiment, in each phase core, rays are respectively taken from the center of the circle to n measurement points to obtain n intersection coordinates of the rays in the phase core and the outside of the insulating part, and specifically, the method includes:

Specifically, in this embodiment, rays are taken from the center of the circle to n measurement points in each phase core; searching and acquiring n intersection point coordinates of the rays in the phase conductor core and the outer side of the insulating part along each ray direction by an image identification method; when the image is identified, the colors of the inner side of the insulating part and the outer side of the insulating part of the wire core are different, so that the intersection point coordinate of the outer side of the insulating part can be rapidly acquired. For example, the insulation of the power cable is generally milky white, the outer part of the insulation is a shielding layer, the color is generally black, and due to the fact that the colors of the inner side of the insulation part and the outer side of the insulation part are different, the coordinates of the intersection point of the ray and the outer side of the insulation part can be rapidly acquired along the directions of the rays. As another example, the insulation of the overhead insulated cable may be black, and thus, a certain color may be added to the fixing bracket for image recognition.

Preferably, the insulation thickness parameters include an insulation average thickness, an insulation maximum thickness, an insulation minimum thickness, and an insulation eccentricity.

Preferably, in S4, calculating a first pixel distance between the coordinate of the measurement point and the coordinate of the intersection point in each phase wire core, and calculating an actual value of the insulation thickness parameter of each phase wire core according to the first pixel distance and the conversion ratio specifically includes:

s401, calculating the first pixel distance between the coordinates of the n measuring points in each phase wire core and the coordinates of the intersection point

s402, according to the second stepA pixel distance

The conversion ratio and the formula

，

s403, according to the first pixel distance

The conversion ratio and the formula

、

，

Calculating to obtain an actual value of the minimum insulation thickness and an actual value of the maximum insulation thickness of each phase of wire core; wherein the content of the first and second substances,

s404, according to the first pixel distance

The conversion ratio and the formula

，

Calculating to obtain an actual value of the insulation eccentricity of each phase of wire core; wherein the content of the first and second substances,

an actual value of insulation eccentricity of the i-th phase is indicated.

Specifically, a first pixel distance between coordinates of n measuring points in each phase wire core and coordinates of an intersection point is calculated

(ii) a Wherein i represents the phase of the cable cores to be tested, i = 1.. and m represents the number of the cable cores to be tested; according to the first pixel distance

Conversion ratio k and formula

，d_lenrepresenting the actual distance between two end points of the gauge, d_pxRepresenting the pixel distance between two end points of the standard ruler; according to the first pixel distance

Conversion ratio k and formula

、

an actual value representing the maximum thickness of insulation of the i-th phase; according to the first pixel distance

Conversion ratio k and formula

，

is shown as

Actual value of insulation eccentricity of the phase.

Through the embodiment, the ith phase data result of the cable to be tested can be obtained through sorting and summarizing

。

And according to the conductor section in the cable model and the requirements in the standard, obtaining the insulation core standard parameters of the m-phase insulation core, such as the insulation average thickness, the insulation minimum thickness, the insulation eccentricity, the insulation shielding average thickness, the insulation shielding minimum thickness, the conductor shielding average thickness, the conductor shielding minimum thickness, the conductor core sectional area and the like. Compare each looks insulation core size actual value and insulation core size standard parameter, obtain the testing result of each looks insulation core size, and then obtain the testing result of all looks insulation core sizes of the cable that awaits measuring, can realize carrying out short-term test to the insulation core size of cable, need not to send the cable sample of intercepting from the cable drum of extraction to detection mechanism and detect, the detection efficiency of cable insulation core size has effectively been improved, prevent that the unqualified cable of insulation core size from getting into the electric wire netting, guarantee grid equipment safety. The above steps are described with specific examples.

The first example is as follows:

in this embodiment, a disc has a model of ZC-YJV₂₂-4×16+1×10mm²Detecting a power cable of-0.6/1 kV, and specifically comprising the following steps:

step 1: opening a heat shrinkable sleeve or a protective cap at any end of the cable to be detected to expose a cable section, or cutting out a cable section on any section of the cable to be detected; and fixing the cable to be tested on the fixing support through the cable fixing bolt. The number of the fixing supports can be multiple, and each fixing support penetrates through a support fixing bolt and a nut to realize combination of different fixing supports; installing a standard ruler support on a support fixing bolt, and adjusting the position of the standard ruler support to be consistent with the cross section of the cable; mounting an electronic terminal bracket on a bracket fixing bolt, and fixing an electronic terminal on the electronic terminal bracket; the position of the electronic terminal support is adjusted, so that the focal length of a camera of the electronic terminal is good, the shooting parameters suitable for the camera are adjusted, the cable section and the standard ruler can be clearly seen, image shooting is carried out, and the section elevation image of the cable to be measured is obtained.

2, constructing a plane coordinate system related to the section elevation image to obtain a pixel distance d between two end points of the standard ruler in the section elevation image_pxAs shown in Table 1, the actual distance d between the two ends of the standard ruler is determined_lenAnd said pixel distance d_pxThe ratio between them is used as a scaling k between the actual distance and the pixel distance,

namely, it is

。

Step 3, the number of the insulated wire cores of the cable to be testedm= 5, A, B, C, N, E respectively, for all phase insulated wire cores of the cable to be testedi=1, …, 5, insulation thickness detection was performed in each case in succession. All phase insulated wire cores of the cable to be tested use circular conductors, 6 measuring points are respectively appointed to the inner sides of the insulated parts of all phase wire cores of the cable in a cross-section front view image, and a measuring point coordinate set of each phase wire core is obtained, as shown in table 2;

coordinates of the object	A	B	C	N	E
						Inner side point 1	(855,737)	(570,701)	(334,871)	(529,1084)	(795,1060)
Inner side point 2	(800,806)	(491,745)	(255,896)	(439,1107)	(730,1077)
						Inner side point 3	(699,793)	(402,690)	(178,829)	(373,1041)	(672,1020)
Inner side point 4	(669,705)	(407,602)	(188,726)	(397,946)	(692,949)
						Inner side point 5	(725,634)	(492,554)	(267,703)	(480,921)	(769,930)
Inner side point 6	(834,650)	(576,602)	(341,760)	(560,988)	(822,986)

TABLE 2

The center of a circle and the coordinates of the center of the circle of the corresponding line core are obtained through the fitting of the coordinate set of the measuring points, as shown in table 3;

	A	B	C	N	E
						circle center coordinate	(763,719)	(490,649)	(261,799)	(465,1014)	(746,1002)

TABLE 3

In each phase wire core, rays are respectively taken from the circle center to 6 measuring points, and 6 intersection point coordinates of the rays and the outer side of the insulating part are respectively found and obtained along the directions of the rays by adopting an image recognition method, as shown in table 4. (the power cable insulation is generally milk white, the outer part of the insulation is a shielding layer, the color is generally black; the overhead insulated cable insulation may be black, and a certain color can be added on the bracket for image recognition)

Coordinates of the object	A	B	C	N	E
						Outer point 1	(893,745)	(599,708)	(363,874)	(557,1103)	(806,1089)
Outer point 2	(813,837)	(519,759)	(223,896)	(412,1125)	(722,1106)
						Outer point 3	(677,818)	(377,708)	(149,829)	(349,1064)	(665,1051)
Outer point 4	(637,699)	(378,593)	(160,720)	(379,919)	(684,918)
						Outer point 5	(711,605)	(524,552)	(301,691)	(503,887)	(771,899)
Outer point 6	(856,629)	(608,602)	(375,751)	(582,967)	(829,956)

TABLE 4

Step 4, calculating the pixel distance between 6 insulation outer side intersection points and insulation inner side intersection points in each phase wire core

As shown in table 5:

pixel distance	A	B	C	N	E
						Inner and outer side points 1	38.8330	29.8329	29.1548	33.8378	31.0161
Inner and outer side points 2	33.6155	31.3050	32.0000	32.4500	30.0832
						Inner and outer points 3	33.3017	30.8058	29.0000	33.2415	31.7805
Inner and outer points 4	32.5576	30.3645	28.6356	32.4500	32.0156
						Inner and outer points 5	32.2025	32.0624	36.0555	41.0488	31.0644
Inner and outer points 6	30.4138	32.0000	35.1710	30.4138	30.8058

TABLE 5

According to the first pixel distance

The conversion ratio and the formula

Calculating to obtain an actual value of the average insulation thickness of each phase wire core;

according to the pixel distance

The conversion ratio and the formula

、

，

Calculating to obtain an actual value of the minimum insulation thickness and an actual value of the maximum insulation thickness of each phase of wire core;

according to the pixel distance

The conversion ratio and the formula

，

The actual value of the insulation eccentricity of each phase of the wire core was calculated as shown in table 6.

And 5, comparing the actual value of the insulation thickness parameter of each phase wire core with the insulation thickness parameter of the standard cable to obtain a cable insulation thickness detection result of the cable to be detected and form a detection result report.

At present, the rated voltage of GB/T12706.1-2020 is 1kV (U)_m= 1.2 kV) to 35kV (U)_m= 40.5 kV) extruded insulated power cable and accessories part 1: rated voltage 1kV (U)_m= 1.2 kV) and 3kV (U)_mThe requirements for this type of cable in = 3.6 kV) cable "are shown in table 7:

standard requirements	A	B	C	N	E
						Average thickness of insulation not less than (mm)	0.7	0.7	0.7	0.7	0.7
Minimum thickness requirement of insulation not less than (mm)	0.63	0.63	0.63	0.63	0.63
						Maximum thickness requirement of insulation not less than (mm)	Is free of	Is free of	Is free of	Is free of	Is free of
Eccentricity (%)	Is free of	Is free of	Is free of	Is free of	Is free of

TABLE 7

It should be noted that table 7 shows that the eccentricity and the maximum insulation thickness are none, which means that no specific requirements are made on the eccentricity and the maximum insulation thickness of the cable of the type in the national standard.

Therefore, all 5-phase insulation thickness parameters of the cable to be detected are qualified, and a corresponding detection result report is issued according to the detection result.

Example two:

in this example, a disc of model ZC-YJLW 03-Z127/220 kV 1X 2500mm²The power cable is detected, and the specific steps are as follows:

step 1: and (3) opening the heat shrinkable sleeve or the protective cap of one end of the cable to be tested to expose a cable section, or cutting out a cable section, and entering the step 2.

And 2, combining a plurality of fixing supports with the cable through cable fixing bolts and accessories, and entering the step 3.

And 3, enabling each fixing support to penetrate through a support fixing bolt and a nut to realize combination of different fixing supports, and entering the step 4.

And 4, mounting the standard fixed-length ruler support on a support fixing bolt, adjusting the position to be consistent with the cable section, and entering the 5 th step.

And 5, mounting the electronic terminal bracket on the bracket fixing bolt, and fixing the electronic terminal on the carrying platform. And adjusting the position of the electronic terminal carrying platform to enable the electronic terminal camera to completely shoot the cable section. The position of the electronic terminal support is adjusted, so that the focal length of the electronic terminal camera is good. And (6) fastening the support fixing nuts of the supports, and entering the step 6.

And 6, step 6: the user opens the electronic terminal, inputs the cable model and determines. And the electronic terminal determines the number m =1 of the insulated wire cores of the cable according to the type of the cable, the number is denoted by A, and the step 7 is carried out.

And 7, opening the camera by the electronic terminal, adjusting the shooting parameters suitable for the camera by a user, clearly seeing the cable section and the standard fixed length ruler, shooting the image, and entering the 8 th step.

And 8, step 8: and (4) displaying the shot image by the electronic terminal, confirming whether the definition and the integrity of the image reach the standard or not by the user, entering the step 9 if the user considers that the image reaches the standard, and returning to the step 7 if the user does not judge that the image reaches the standard.

9, the electronic terminal establishes a pixel plane coordinate system for the image, calls an image identification method, identifies and obtains pixel coordinate positions of two end points of the standard fixed length ruler on the image, and enters step 10; if the coordinates on the images of the two end points can not be identified, a prompt that the two end points of the fixed length scale are not identified in the images is given, and the step 7 is returned.

Step 10, calculating the pixel distance between two end points of the standard fixed length rulerd _pxFrom the pixel distance to the actual distance between the two ends of the standard length-fixed rulerd _lenObtaining the proportionality coefficient between the image pixel distance and the actual distance

. And (6) entering the step 11.

The above procedure gave the following results:

item

Endpoint

1 coordinate

Endpoint 2 coordinates

Pixel distance dpx (px)

Actual distance dlen (mm)

Proportionality coefficient k (mm/px)

Results

(1473,311)

(1717,350)

247.097

10

0.04047

And step 11, for all the phase insulated wire cores i =1, …,1, each phase is dependent on the phase of the insulated wire core to be measured, which is input by a user, and the step 11.1 is entered.

According to the actual condition of the cable, all phase insulation wire cores use stranded conductors.

Step 11.1, the electronic terminal displays the photographed images, and the user follows the general test method for insulation and sheathing materials of cables and optical cables GB/T2951.11 part 11: and (3) according to standard requirements of a universal test method, such as thickness and outline dimension measurement, mechanical performance test and the like, sequentially clicking 6 points on the inner side of the insulation part of the i-th phase circular conductor or stranded conductor on the image, and entering the 11.2 step after the user confirms.

And 11.2, determining the coordinates of the points provided by the user according to the points specified by the user and the pixel plane coordinate system, and performing plane circular least square fitting calculation. If the fitting calculation is successful, obtaining a fitting circle center, and entering the 11.3 rd step; and if the fitting calculation fails, giving a prompt that the point selected by the user cannot be subjected to the fitting calculation, and returning to the step 11.1.

According to GB/T2951.11-2008 Cable and Cable insulation and sheath materials general test method part 11: after the general test method-thickness and outline dimension measurement-mechanical performance test-each phase respectively carries out the steps, the coordinate results of 6 points at the inner side of the insulation part confirmed by a user are respectively obtained as follows:

coordinates of the object	A
		Insulating inner side point 1	(1573,2683)
Insulating inner side point 2	(920,2235)
		Insulated inner side point 3	(1016,1496)
Insulated inner side point 4	(1599,1226)
		Insulated inner side points 5	(2262,1671)
Insulated inner side point 6	(2284,2169)

The circle center results obtained by fitting calculation are as follows:

insulating inside point fitting	A
		Circle center coordinate	(1589,1953)

And 11.3, respectively making rays from the fitting center to 6 points, and respectively searching and obtaining the pixel coordinates of each intersection point of the rays and the outer side of the insulating part along each ray direction by adopting an image identification method. (the power cable insulation is generally milk white, the outer part of the insulation is a shielding layer, the color is generally black, the overhead insulated cable insulation can be black, and a certain color can be added on a bracket for image recognition) enters the 11.4 step.

11.4, respectively calculating the pixel distance between 6 insulating outer side intersections and insulating inner side intersections

(ii) a And step 11.5.

After the above steps are respectively carried out on each phase, the obtained insulating outer side intersection points are respectively as follows:

coordinates of the object	A
		Insulating outer point 1	(1560,3286)
Insulating outer point 2	(367,2468)
		Insulating outer point 3	(553,1128)
Insulating outer point 4	(1608,642)
		Insulating outer point 5	(2817,1438)
Insulated outer point 6	(2839,2341)

The corresponding pixel distances are:

pixel distance	A
		Insulating inner and outer side points 1	603.1401
Insulating inner and outer side points 2	600.0817
		Insulating inner and outer side points 3	591.4330
Insulating inner and outer side points 4	584.0693
		Insulating inner and outer points 5	601.9252
Insulating inner and outer side points 6	581.0413

11.5, calculating to obtain the i-th phase insulated wire core according to the standard

Mean thickness of insulation

、

Minimum thickness of insulation

、

Maximum thickness of insulation

、

Degree of eccentricity of insulation

Insulating parameters are equal; and step 11.6.

After the above steps are respectively performed for each phase, the collected insulation parameters are respectively as follows:

summary of results	A
		Average thickness of insulation davg (mm)	24.02
Minimum insulation thickness dmin (mm)	23.51
		Maximum thickness of insulation dmax (mm)	24.41
Eccentricity t (%)	3.66

At present, the requirements for the cable of the type in the Q/GDW 13242 and 2018220 kV power cable system procurement standard are as follows:

standard requirements	A
		Average thickness of insulation not less than (mm)	24.0
Minimum thickness requirement of insulation not less than (mm)	22.8
		Maximum thickness requirement of insulation not greater than (mm)	25.2
Eccentricity not more than (%)	6

The insulation size is seen to meet the standard requirements.

And 11.6, judging the type of the input cable, and if the type of the input cable is not a 1kV power cable, entering 11.7.

And 11.7, respectively searching and obtaining the pixel coordinates of each intersection point of the ray and the outer side of the insulation shield along each ray direction by adopting an image identification method. And step 11.8 is entered.

11.8, respectively calculating the pixel distance between the n insulating outer side intersections and the insulating shielding outer side intersections

(ii) a And step 11.9.

coordinates of the object	A
		Insulation shield outside point 1	(1559,3315)
Insulation shield outer side point 2	(337,2481)
		Insulation shield outer side point 3	(531,1110)
Insulation shield outer side point 4	(1608,614)
		Insulation shield outside point 5	(2844,1427)
Insulation shield outside point 6	(2868,2350)

The corresponding pixel distances are:

pixel distance	A
		Insulation shield inside and outside points 1	29.0172
Insulation shield inside and outside points 2	32.6956
		Insulation shield inside and outside points 3	28.4253
Insulation shield inside and outside points 4	28.0000
		Insulation shield inside and outside points 5	29.1548
Insulation shield inside and outside points 6	30.3645

11.9, according to the standard, calculating to obtain the i-th phase insulated wire core

Average thickness of insulation shield

、

Minimum thickness of insulation shield

、

Maximum thickness of insulation shield

Waiting for insulation shielding parameters; and step 11.10 is entered.

After the steps are respectively carried out on each phase, the collected insulation shielding parameters are respectively as follows:

summary of results	A
		Average thickness of insulation shield davg (mm)	1.198
Minimum thickness dmin (mm) of insulation shield	1.133
		Maximum thickness dmax (mm) of the insulation shield	1.323

standard requirements	A
		Average thickness requirement of insulation shield not less than (mm)	Is free of
Minimum thickness requirement of insulation shield is not less than (mm)	0.5
		Maximum thickness requirement of insulation shield is not more than (mm)	Is free of

The size of the insulation shield can be seen to meet the standard requirements.

11.10, respectively making rays from 6 points on the inner side of the insulation to the fitting circle center, and respectively searching and obtaining the pixel coordinates of a first intersection point of the rays and the inner side of the conductor shield (also the outer side of the conductor wire core) along each ray direction by adopting an image identification method; and step 11.11 is entered.

11.11, respectively calculating the pixel distance between 6 insulation inner side points and the intersection point of the conductor shield inner side points

(ii) a And step 11.12 is entered.

After the steps are respectively carried out on each phase, the obtained intersection points at the inner side of the conductor shield are respectively as follows:

coordinates of the object	A
		Conductor shield inner side point 1	(1574,2625)
Conductor shield inner side point 2	(973,2213)
		Conductor shield inner side point 3	(1049,1523)
Conductor shield inner side point 4	(1599,1291)
		Conductor shield inside point 5	(2208,1693)
Conductor shield inside point 6	(2225,2150)

The corresponding pixel distances are:

pixel distance	A
		Conductor shield inside and outside points 1	58.0086
Conductor shield inside and outside points 2	57.3847
		Conductor shield inside and outside points 3	42.6380
Conductor shield inside and outside points 4	65.0000
		Conductor shield inside and outside points 5	58.3095
Conductor shield inside and outside points 6	61.9839

11.12, according to the standard, calculating to obtain the i-th phase insulated wire core

Conductor shield average thickness

、

Minimum thickness of conductor shield

、

Maximum thickness of conductor shield

Conductor shielding parameters are equalized; and step 11.13 is entered.

At step 11.13, a planar circle fitting calculation (e.g., using a least squares fit) is performed using 6 conductor shield inside intersections. If the fitting calculation is successful, obtaining the radius of the fitting circle, and entering the step 11.14; and if the fitting calculation fails, giving a prompt that the point selected by the user cannot be subjected to the fitting calculation, and returning to the step 11.1.

Step 11.14, the area of the fitting circle is taken as the sectional area of the conductor wire core

(ii) a And step 11.15 is entered.

And 11.15, sorting and summarizing the data result of the phase i:

(ii) a And entering the step 12.

12, according to the conductor section in the cable model and the requirements in the standard, obtaining the requirements of insulation average thickness, insulation minimum thickness, insulation eccentricity, insulation shielding average thickness, insulation shielding minimum thickness, conductor shielding average thickness, conductor shielding minimum thickness, conductor core section area and other insulation core parameters of all m-phase insulation cores, and judging whether the insulation core parameters are qualified or not; and entering the step 13.

And step 13, summarizing the conclusion whether all the phase insulation wire core parameters are qualified or not to form a detection result report. And finishing the field detection of the size of the insulated wire core of the coiled cable.

summary of results	A
		Conductor shield average thickness davg (mm)	2.316
Minimum thickness dmin (mm) of conductor shield	1.726
		Maximum thickness dmax (mm) of the conductor shield	2.631
Conductor section area s (mm2)	2322.51

standard requirements	A
		Conductor screenThe shielding average thickness requirement is not less than (mm)	Is free of
Minimum thickness requirement of conductor shield is not less than (mm)	0.8
		Conductor shield maximum thickness requirement not greater than (mm)	Is free of
Conductor cross-sectional area requirement not less than (mm2)	Is free of

The conductor and conductor shield dimensions are found to meet standard requirements.

Therefore, the parameters of each phase of the insulated wire core of the cable are qualified, and a corresponding detection report can be issued according to the measurement result; and completing the size field detection of the insulated wire core of the coiled cable.

Correspondingly, the invention also provides a device for detecting the size of the insulated wire core of the cable, which can realize all the processes of the method for detecting the size of the insulated wire core of the cable in the embodiment.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a device for detecting a size of an insulated wire core of a cable according to a preferred embodiment of the present invention. Cable insulation sinle silk size detection device includes:

the acquisition module 301 is used for acquiring a cross-section elevation image of the cable to be detected;

a constructing module 302, configured to construct a plane coordinate system for the cross-sectional elevation image to obtain a pixel distance between two end points of a standard ruler in the cross-sectional elevation image, and use a ratio between an actual distance between the two end points of the standard ruler and the pixel distance as a conversion ratio between the actual distance and the pixel distance;

an obtaining module 303, configured to assign n measurement points to the inside of the insulation of each phase core of the cable in the cross-sectional front view image, respectively, to obtain a measurement point coordinate set of each phase core, and obtain a circle center of the corresponding phase core and coordinates of the circle center through fitting of the measurement point coordinate set, in each phase core, making a ray from the circle center to n measurement points, respectively, so as to obtain n intersection point coordinates of the ray in the phase core and the outside of the insulation;

the calculation module 304 is configured to calculate a pixel distance between the coordinate of the measurement point in each phase wire core and the coordinates of the n intersection points outside the insulation, and calculate an actual value of the insulation thickness parameter of each phase wire core according to the pixel distance and the conversion ratio;

a comparison module 305, configured to compare the actual value of the insulation thickness parameter of each phase core with the insulation thickness parameter of the standard cable, so as to obtain a cable insulation thickness detection result of the cable to be detected.

Preferably, the method further comprises:

Preferably, the acquisition module 301 is specifically configured to:

Preferably, in each phase core, rays are respectively taken from the center of circle to the n measurement points to obtain n intersection coordinates of the rays in the phase core and the outside of the insulating part, and the method specifically includes:

Preferably, the calculating module 304 is specifically configured to:

；

Wherein i represents the phase of the cable cores to be tested, i = 1.. and m represents the number of the cable cores to be tested;

according to the first pixel distance

The conversion ratio and the formula

wherein the content of the first and second substances,

according to the first pixel distance

The conversion ratio and the formula

、

Calculating to obtain an actual value of the minimum insulation thickness and an actual value of the maximum insulation thickness of each phase of the wire core;

wherein the content of the first and second substances,

according to the first pixel distance

The conversion ratio and the formula

，

an actual value of insulation eccentricity of the i-th phase is indicated.

In a specific implementation, the working principle, the control flow and the technical effect of the device for detecting the size of the insulated wire core of the cable provided by the embodiment of the invention are the same as those of the method for detecting the size of the insulated wire core of the cable in the embodiment, and are not described herein again.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a preferred embodiment of a cable insulation core size detection system according to the present invention. The cable insulation core size detection system comprises a fixed support 1, a standard ruler support 2, an electronic terminal support 3, an electronic terminal 4 and an upper computer (not shown in the figure);

the fixing support 1 is provided with a plurality of cable fixing threaded holes 101 and a plurality of support fixing holes 6, and a cable 5 to be tested is fixed inside the fixing support 1 through the cable fixing threaded holes 101 by a cable fixing bolt;

a standard ruler 201 is fixed on the standard ruler support 2, and a plurality of support fixing holes 6 are formed in the standard ruler support 2;

an electronic terminal 4 is fixed on the electronic terminal bracket 3, and a plurality of bracket fixing holes 6 are formed in the electronic terminal bracket 3;

the fixed support 1, the standard ruler support 2 and the electronic terminal support 3 are fixed on the same horizontal plane through the support fixing holes 6 by support fixing bolts;

the upper computer is connected with the electronic terminal 4, and the upper computer is the cable insulation wire core size detection device.

Specifically, referring to fig. 5, fig. 6 and fig. 7, fig. 5 is a schematic structural diagram of a fixing bracket in a preferred embodiment of a system for detecting a size of an insulated wire core of a cable according to the present invention; FIG. 6 is a schematic structural diagram of a standard ruler support in a preferred embodiment of a cable insulated wire core dimension detection system provided by the invention; fig. 7 is a schematic structural diagram of an electronic terminal bracket in a preferred embodiment of the cable insulated wire core size detection system provided by the invention.

Be equipped with a plurality of cable fixing screw holes and a plurality of support fixed orifices on the fixed bolster, cable fixing bolt passes through cable fixing screw hole and fixes the cable that awaits measuring inside the fixed bolster, and the position of cable fixing bolt and the cable contact that awaits measuring needs install the blotter additional. In this embodiment, the fixed bolster can be a plurality of to realize the good fixed of the cable that awaits measuring. And the bracket fixing bolt penetrates through the bracket fixing hole to be matched with the nut, so that the plurality of brackets are fixed. A standard ruler is fixed on the standard ruler support, special marks are arranged at two ends of the standard ruler for identification, and a plurality of support fixing holes are formed in the standard ruler support; an electronic terminal is fixed on the electronic terminal bracket through an electronic terminal lapping platform, and a plurality of bracket fixing holes are formed in the electronic terminal bracket; the electronic terminal is fixed on the mounting platform, and the position of the mounting platform of the electronic terminal is adjusted, so that a camera of the electronic terminal can completely shoot the cross section of the cable; the position of the electronic terminal support is adjusted, so that the focal length of a camera of the electronic terminal is good, and then a cross-section elevation image of the cable to be measured is acquired. The bracket fixing bolt fixes the fixing bracket, the standard ruler bracket and the electronic terminal bracket on the same horizontal plane through the bracket fixing hole; the standard ruler support can be fixed at the cable measuring section by adjusting the position of the standard ruler support on the support fixing bolt.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a terminal device according to a preferred embodiment of the present invention. The terminal device comprises a processor 801, a memory 802 and a computer program stored in the memory 802 and configured to be executed by the processor 801, wherein the processor 801 executes the computer program to implement the cable insulated wire core size detection method according to any one of the above embodiments.

Preferably, the computer program may be divided into one or more modules/units (e.g., computer program 1, computer program 2, … …) that are stored in the memory 802 and executed by the processor 801 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device.

The Processor 801 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, etc., the general purpose Processor may be a microprocessor, or the Processor 801 may be any conventional Processor, the Processor 801 is a control center of the terminal device, and various interfaces and lines are used to connect various parts of the terminal device.

The memory 802 mainly includes a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like, and the data storage area may store related data and the like. In addition, the memory 802 may be a high speed random access memory, a non-volatile memory such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), and the like, or the memory 802 may be other volatile solid state memory devices.

It should be noted that the terminal device may include, but is not limited to, a processor and a memory, and those skilled in the art will understand that the structural diagram of fig. 8 is only an example of the terminal device and does not constitute a limitation of the terminal device, and may include more or less components than those shown, or combine some components, or different components.

The embodiment of the invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for detecting the size of the insulated wire core of the cable according to any one of the above embodiments.

The embodiment of the invention provides a method, a device, a system, equipment and a medium for detecting the size of a cable insulation core, which are used for acquiring a cross-section front view image of a cable to be detected on site, acquiring a measurement point coordinate and an intersection point coordinate of each phase core of the cable in the cross-section front view image, calculating an actual value of an insulation thickness parameter of each phase core according to a pixel distance between the measurement point coordinate and the intersection point coordinate of each phase core, comparing the actual value of the insulation thickness parameter of each phase core with a standard cable insulation thickness parameter, further acquiring a cable insulation thickness detection result of the cable to be detected, realizing the rapid detection of the insulation thickness of the cable, avoiding the need of sending a cable sample intercepted from an extracted cable drum to a detection mechanism for detection, effectively improving the detection efficiency of the insulation thickness of the cable, therefore, comprehensive insulation detection is carried out on all cables to be laid in a cable laying site, cables with unqualified insulation thickness are prevented from entering a power grid, and the safety of power grid equipment is guaranteed.

It should be noted that the above-described system embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the system provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. A method for detecting the size of an insulated wire core of a cable is characterized by comprising the following steps:

collecting a cross-section elevation image of a cable to be measured;

2. The method of detecting the dimensions of an insulated wire core of a cable of claim 1, further comprising:

3. The method of detecting the dimensions of the insulated wire core of the cable of claim 2, further comprising:

4. The method of detecting the dimensions of the insulated wire core of the cable of claim 3, further comprising:

5. The method for detecting the dimension of the insulated wire core of the cable according to claim 1, wherein the step of acquiring the cross-sectional front view image of the cable to be detected specifically comprises the steps of:

6. The method for detecting the dimension of the insulated wire core of the cable according to claim 1, wherein the step of obtaining coordinates of n intersection points of the ray and the outside of the insulated part in each phase wire core by respectively radiating rays from the center of the circle to n measuring points comprises the steps of:

7. The method of claim 1, wherein the insulation thickness parameters include average insulation thickness, maximum insulation thickness, minimum insulation thickness, and eccentricity of insulation.

8. The method for detecting the dimension of the insulated wire core of the cable according to claim 7, wherein the step of calculating a first pixel distance between the coordinates of the measuring point and the coordinates of the intersection point in each phase of the wire core and calculating an actual value of the insulation thickness parameter of each phase of the wire core according to the first pixel distance and the conversion ratio comprises the steps of:

according to the first pixel distance

The conversion ratio and the formula

according to the first pixel distance

The conversion ratio and the formula

、

according to the first pixel distance

The conversion ratio and the formula

an actual value of insulation eccentricity of the i-th phase is indicated.

9. The utility model provides a cable insulation core size detection device which characterized in that includes:

10. A cable insulation core size detection system is characterized by comprising a fixed support, a standard ruler support, an electronic terminal and an upper computer;

the upper computer is connected with the electronic terminal, and the upper computer is the cable insulation wire core size detection device of claim 9.