CN109799439A - A kind of insulation multi-angle oblique scratches cable dampness experimental evaluation method and device - Google Patents
A kind of insulation multi-angle oblique scratches cable dampness experimental evaluation method and device Download PDFInfo
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- 239000011159 matrix material Substances 0.000 claims abstract description 96
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- 238000009736 wetting Methods 0.000 claims description 40
- 238000002474 experimental method Methods 0.000 claims description 14
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Abstract
This application discloses a kind of insulation multi-angle obliques to scratch cable dampness experimental evaluation method and device, the described method includes: obtaining preset times multi-angle oblique in preset time scratches cable insulation surface temperature, the multi-angle oblique scratches cable insulation surface temperature and is measured by the several temperature sensors for being distributed in multi-angle oblique scuffing cable insulation surface, and every four adjacent temperature sensors form a rectangular area；The criteria weights matrix and standard deviation matrix that cable insulation surface temperature calculates each rectangular area in preset time are scratched according to the multi-angle oblique；The dampness factor is scratched according to the multi-angle oblique that the criteria weights matrix and the standard deviation matrix calculate each rectangular area in preset time；The dampness factor, which is scratched, according to the multi-angle oblique assesses the multi-angle oblique scuffing cable insulation dampness state.The application can carry out the assessment of dampness situation to the cable that insulation multi-angle oblique scratches.
Description
Technical Field
The application relates to the technical field of cable body insulation state detection, in particular to an insulation multi-angle inclined scratch cable damping experiment evaluation method and device.
Background
The cable plays an important role in electric energy transmission, and the use state of the cable directly influences the safe, stable and economic operation of the power system. The cable insulation is an important component of the cable and is also a part which is easily damaged during the operation of the cable. In actual operation, the cable not only faces the threat of environments such as high humidity, strong ray, and the nonstandard of most cable manufacture processes moreover leads to the condition that there is the multi-angle fish tail on the cable insulation surface, and cable insulation has very big probability to be destroyed, leads to cable insulation performance to descend. The reduction of the insulation performance of the cable not only causes a large amount of electric energy loss, but also has serious safety risk, so that the working current in a line is increased, the service life of electrical equipment is shortened, and fire, electric shock accidents and the like are caused to cause inestimable loss. Therefore, the moisture condition evaluation of the insulated multi-angle inclined scratch cable is particularly important.
At present, for the evaluation of the damp condition of a cable, the cable with a good insulation state is generally used, the reduction of the insulation state of the cable is rarely considered, particularly the condition of multi-angle insulation scratch is avoided, and a reliable and safe method for evaluating the overall damp condition of the multi-angle insulation oblique scratch cable is not provided.
Disclosure of Invention
The application aims to provide an insulating multi-angle inclined scratch cable wetting experiment evaluation method and device, and aims to solve the problem that the whole wetting condition evaluation cannot be carried out on the insulating multi-angle inclined scratch cable.
In one aspect, according to an embodiment of the present application, a multi-angle oblique scratch cable insulation wetting experiment evaluation method is provided, including:
acquiring the temperature of the insulating surface of a cable scratched in a multi-angle inclined mode for preset times within preset time, wherein the temperature of the insulating surface of the cable scratched in the multi-angle inclined mode is measured by a plurality of temperature sensors distributed on the insulating surface of the cable scratched in the multi-angle inclined mode, and every four adjacent temperature sensors form a rectangular area;
calculating a standard weight matrix and a standard deviation matrix of each rectangular area within preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable;
calculating a multi-angle inclined scratch wetting factor of each rectangular area within preset time according to the standard weight matrix and the standard deviation matrix;
and evaluating the insulation damp state of the multi-angle inclined scratch cable according to the multi-angle inclined scratch damp factor.
Further, the number of the temperature sensors is 16, and the 16 temperature sensors are uniformly distributed on the surface of the multi-angle inclined scratch cable insulation in a 4 x 4 structure.
Further, the method further comprises the step of calculating a formula of a standard weight matrix of each rectangular area in preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable, wherein the formula comprises the following steps:
wherein D isjFor setting the time zone SjWeight matrix of Dj TFor setting the time zone SjWeight matrix D ofjThe transpose matrix of (a) is,is the square of the 2-norm of the matrix,for setting the time zone SjI is a 4 × 4 identity matrix.
Further, the method further comprises the step of calculating a standard deviation matrix formula of each rectangular area in preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable, wherein the standard deviation matrix formula comprises the following steps:
wherein Q isjFor setting the time zone SjThe deviation matrix of (a) is calculated,for setting the time zone SjOf a standard deviation matrix, Qj TFor setting the time zone SjDeviation matrix Q ofjThe transpose matrix of (a) is,is the matrix 2-norm squared, I is the 4 x 4 identity matrix.
Further, the formula for calculating the multi-angle inclined scratch wetting factor of each rectangular area within the preset time according to the standard weight matrix and the standard deviation matrix is as follows:
wherein,for setting the time zone SjThe standard weight matrix of (a) is,for setting the time zone SjThe standard deviation matrix, | · | novision2Is a matrix 2-norm, | ·| luminanceFIs the matrix F-norm.
Further, the step of evaluating the insulation damp state of the multi-angle inclined scratch cable according to the multi-angle inclined scratch damp factor comprises the following steps:
if the multi-angle inclined scratch wetting factors are not larger than a first wet threshold value, or at least 1 and not more than 8 multi-angle inclined scratch wetting factors are larger than the first wet threshold value and not larger than a second wet threshold value, the multi-angle inclined scratch cable insulation is in a slightly uneven wetting state;
if at least 1 and not more than 3 of the multi-angle inclined scratch wetting factors are not smaller than a second damp threshold value, or at least 9 and not more than 12 of the multi-angle inclined scratch wetting factors are larger than a first damp threshold value and not larger than a second damp threshold value, the multi-angle inclined scratch cable insulation is in a moderate uneven wetting state;
if at least 4 and no more than 12 multi-angle inclined scratch wetting factors are not less than a second wetting threshold value, the multi-angle inclined scratch cable insulation is in a heavily uneven wetting state;
wherein the first wetness threshold is 36 and the second wetness threshold is 156.
On the other hand, according to the embodiment of the application, the multi-angle inclined scratch cable insulation damp experiment evaluation device is provided, wherein the multi-angle inclined scratch cable insulation comprises a cable core and cable insulation arranged outside the cable core, and comprises a current generator, a first high-voltage cable, a second high-voltage cable, a first high-voltage contact pole, a second high-voltage contact pole, a left fixing ring, a right fixing ring, a temperature sensor assembly and an upper computer processor;
the current generator is connected with the first high-voltage contact pole through the first high-voltage cable, the first high-voltage contact pole is connected with the cable core through the left fixing ring, the current generator is connected with the second high-voltage contact pole through the second high-voltage cable, and the second high-voltage contact pole is connected with the cable core through the right fixing ring;
the temperature sensor assembly is attached to the insulated surface of the cable and connected with the upper computer processor.
Further, the temperature sensor assembly comprises 16 temperature sensors, and the 16 temperature sensors are uniformly distributed on the surface of the cable insulation in a 4 x 4 structure.
According to the technical scheme, the embodiment of the application provides a method and a device for evaluating the insulation damp experiment of a multi-angle inclined scratch cable, wherein the method comprises the following steps: acquiring the temperature of the insulating surface of a cable scratched in a multi-angle inclined mode for preset times within preset time, wherein the temperature of the insulating surface of the cable scratched in the multi-angle inclined mode is measured by a plurality of temperature sensors distributed on the insulating surface of the cable scratched in the multi-angle inclined mode, and every four adjacent temperature sensors form a rectangular area; calculating a standard weight matrix and a standard deviation matrix of each rectangular area within preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable; calculating a multi-angle inclined scratch wetting factor of each rectangular area within preset time according to the standard weight matrix and the standard deviation matrix; and evaluating the insulation damp state of the multi-angle inclined scratch cable according to the multi-angle inclined scratch damp factor. This application can carry out the aassessment of the situation of weing to the cable of insulating multi-angle slope fish tail.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for evaluating insulation damping experiment of a multi-angle inclined scratched cable according to an embodiment of the present application;
FIG. 2 is a diagram illustrating a cable insulation surface temperature sensor profile according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram showing a multi-angle oblique scratch cable insulation damping experiment evaluation device according to an embodiment of the application.
Illustration of the drawings:
wherein, 1-an upper computer processor, 2-a current generator, 3-a second high-voltage cable, 4-a first high-voltage cable, 5-a first high-voltage contact pole, 6-a second high-voltage contact pole, 7-a left fixing ring, 8-a right fixing ring, 9-a cable core, 10-a cable insulator, a temperature sensor component and, 11-a first temperature sensor, 12-a second temperature sensor, 13-a third temperature sensor, 14-a fourth temperature sensor, 15-a fifth temperature sensor, 16-a sixth temperature sensor, 17-a seventh temperature sensor, 18-an eighth temperature sensor, 19-a ninth temperature sensor, 20-a tenth temperature sensor, 21-an eleventh temperature sensor, 22-a twelfth temperature sensor, 23-thirteenth temperature sensor, 24-fourteenth temperature sensor, 25-fifteenth temperature sensor, 26-sixteenth temperature sensor.
Detailed Description
Referring to fig. 1, an embodiment of the application provides a multi-angle inclined scratched cable insulation wetting experiment evaluation method, including:
step S1, obtaining the temperature of the insulating surface of the cable scratched in a preset time in a multi-angle inclined mode for a preset number of times, wherein the temperature of the insulating surface of the cable scratched in a multi-angle inclined mode is measured by a plurality of temperature sensors distributed on the insulating surface of the cable scratched in a multi-angle inclined mode, and every four adjacent temperature sensors form a rectangular area;
before proceeding to step S1, it is necessary to make a multi-angle slant-scratched cable insulation.
Step S2, calculating a standard weight matrix and a standard deviation matrix of each rectangular area within preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable;
step S3, calculating the multi-angle inclined scratch wetting factor of each rectangular area in preset time according to the standard weight matrix and the standard deviation matrix;
and step S4, evaluating the insulation damp state of the multi-angle inclined scratch cable according to the multi-angle inclined scratch damp factor.
Further, the number of the temperature sensors is 16, and the 16 temperature sensors are uniformly distributed on the surface of the multi-angle inclined scratch cable insulation in a 4 x 4 structure. In the present application, the arrangement of the temperature sensors is shown in fig. 2, and each area is equal, which is beneficial in that the rectangular area formed by the temperature data measured by the four temperature sensors can reflect the temperature condition of the area to a certain extent. Meanwhile, the arrangement according to fig. 2 reflects the temperature of the same cable axis as well as the temperature of the same cable cross section.
Further, the method further comprises the step of calculating a formula of a standard weight matrix of each rectangular area in preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable, wherein the formula comprises the following steps:
wherein D isjFor setting the time zone SjWeight matrix of Dj TFor setting the time zone SjWeight matrix D ofjThe transpose matrix of (a) is,is the square of the 2-norm of the matrix,for setting the time zone SjI is a 4 × 4 identity matrix.
Take 16 temperature sensors, with a preset time of 1min and 4 times as an example. The temperature sensors collect the surface temperature of the cable insulation 10 at multiple angles once every 15s, 1min is taken as a period, namely, one temperature sensor collects four groups of data within 1min, and the data in the temperature sensors are extracted once every 1min and recorded as c(i,t)The method is characterized in that the method represents the t-th time data acquired by the ith temperature sensor within 1min, i is a real number, and i belongs to [1,16 ]]T is a real number, t is an element [1,4 ]]。
The areas surrounded by the first temperature sensor 11, the second temperature sensor 12, the third temperature sensor 15, and the fourth temperature sensor 16 are denoted as S1The areas surrounded by the third temperature sensor 15, the fourth temperature sensor 16, the fifth temperature sensor 19, and the sixth temperature sensor 20 are denoted as S2The areas surrounded by the fifth temperature sensor 19, the sixth temperature sensor 20, the seventh temperature sensor 23, and the eighth temperature sensor 24 are denoted as S3The areas surrounded by the second temperature sensor 12, the fourth temperature sensor 16, the ninth temperature sensor 13, and the eleventh temperature sensor 17 are denoted as S4The areas surrounded by the fourth temperature sensor 16, the sixth temperature sensor 20, the eleventh temperature sensor 17, and the thirteenth temperature sensor 21 are denoted as S5The areas surrounded by the sixth temperature sensor 20, the eighth temperature sensor 24, the thirteenth temperature sensor 21, and the fifteenth temperature sensor 25 are denoted as S6The area surrounded by the ninth temperature sensor 13, the tenth temperature sensor 14, the eleventh temperature sensor 17, and the twelfth temperature sensor 18 is denoted as S7The area surrounded by the eleventh temperature sensor 17, the twelfth temperature sensor 18, the thirteenth temperature sensor 21, and the fourteenth temperature sensor 22 is denoted as S8The areas surrounded by the thirteenth temperature sensor 21, the fourteenth temperature sensor 22, the fifteenth temperature sensor 25, and the sixteenth temperature sensor 26 are denoted as S9The area surrounded by the tenth temperature sensor 14, the twelfth temperature sensor 18, the first temperature sensor 11, and the third temperature sensor 15 is denoted as S10The area surrounded by the twelfth temperature sensor 18, the fourteenth temperature sensor 22, the third temperature sensor 15, and the fifth temperature sensor 19 is denoted as S11The areas surrounded by the fourteenth temperature sensor 22, the sixteenth temperature sensor 26, the fifth temperature sensor 19, and the seventh temperature sensor 23 are denoted as S12。
Calculate region S within 1minjStandard weight matrix of
Is the region S within 1minjWherein:
when j is 1, k1＝1、k2＝2、k3＝3、k4＝4；
When j is 2, k1＝3、k2＝4、k3＝5、k4＝6；
When j is 3, k1＝5、k2＝6、k3＝7、k4＝8；
When j is 4, k1＝2、k2＝9、k3＝4、k4＝11；
When j is 5, k1＝4、k2＝11、k3＝6、k4＝13；
When j is 6, k1＝6、k2＝13、k3＝8、k4＝15；
When j is 7, k1＝9、k2＝10、k3＝11、k4＝12；
When j is 8, k1＝11、k2＝12、k3＝13、k4＝14；
When j is 9, k1＝13、k2＝14、k3＝15、k4＝16；
When j is 10, k1＝10、k2＝1、k3＝12、k4＝3；
When j equals 11, k1＝12、k2＝3、k3＝14、k4＝5；
j＝12 is k1＝14、k2＝5、k3＝16、k4＝7；
e is a natural constant, 2.7188 is taken, DjIs the region S within 1minjWeight matrix of Dj TIs the region S within 1minjWeight matrix D ofjThe transpose matrix of (a) is,is the square of the 2-norm of the matrix,is the region S within 1minjI is a 4 × 4 identity matrix; k is a radical ofiIs the ith temperature sensor, i is a real number, i is E [1,16 ∈]。
Further, the method further comprises the step of calculating a standard deviation matrix formula of each rectangular area in preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable, wherein the standard deviation matrix formula comprises the following steps:
wherein Q isjFor setting the time zone SjThe deviation matrix of (a) is calculated,for setting the time zone SjOf a standard deviation matrix, Qj TFor setting the time zone SjDeviation matrix Q ofjThe transpose matrix of (a) is,is the matrix 2-norm squared, I is the 4 x 4 identity matrix.
Taking 16 temperature sensors, the preset time is 1min, and the preset times are 4 times as an example, namely the temperature sensors collect the temperature of the insulation surface of the cable scratched in a multi-angle inclined manner every 15 s.
Calculate region S within 1minjOf the standard deviation matrix
Is the region S within 1minjThe offset column vector of (2), wherein:
when j is 1, k1＝1、k2＝2、k3＝3、k4＝4；
When j is 2, k1＝3、k2＝4、k3＝5、k4＝6；
When j is 3, k1＝5、k2＝6、k3＝7、k4＝8；
When j is 4, k1＝2、k2＝9、k3＝4、k4＝11；
When j is 5, k1＝4、k2＝11、k3＝6、k4＝13；
When j is 6, k1＝6、k2＝13、k3＝8、k4＝15；
When j is 7, k1＝9、k2＝10、k3＝11、k4＝12；
When j is 8, k1＝11、k2＝12、k3＝13、k4＝14；
When j is 9, k1＝13、k2＝14、k3＝15、k4＝16；
When j is 10, k1＝10、k2＝1、k3＝12、k4＝3；
When j equals 11, k1＝12、k2＝3、k3＝14、k4＝5；
When j is 12, k1＝14、k2＝5、k3＝16、k4＝7；
e is a natural constant, 2.7188, Q is takenjIs the region S within 1minjThe deviation matrix of (a) is calculated,is the region S within 1minjOf a standard deviation matrix, Qj TIs the region S within 1minjDeviation matrix Q ofjThe transpose matrix of (a) is,is a matrix 2-norm square, and I is a 4 multiplied by 4 identity matrix; k is a radical ofiIs the ith temperature sensor, i is a real number, i is E [1,16 ∈]。
Further, the formula for calculating the multi-angle inclined scratch wetting factor of each rectangular area within the preset time according to the standard weight matrix and the standard deviation matrix is as follows:
wherein,to prepareSet time in region SjThe standard weight matrix of (a) is,for setting the time zone SjThe standard deviation matrix, | · | novision2Is a matrix 2-norm, | ·| luminanceFIs the matrix F-norm.
Further, the step of evaluating the insulation damp state of the multi-angle inclined scratch cable according to the multi-angle inclined scratch damp factor comprises the following steps:
if the multi-angle inclined scratch wetting factors are not larger than a first wet threshold value, or at least 1 and not more than 8 multi-angle inclined scratch wetting factors are larger than the first wet threshold value and not larger than a second wet threshold value, the multi-angle inclined scratch cable insulation is in a slightly uneven wetting state;
if at least 1 and not more than 3 of the multi-angle inclined scratch wetting factors are not smaller than a second damp threshold value, or at least 9 and not more than 12 of the multi-angle inclined scratch wetting factors are larger than a first damp threshold value and not larger than a second damp threshold value, the multi-angle inclined scratch cable insulation is in a moderate uneven wetting state;
if at least 4 and no more than 12 multi-angle inclined scratch wetting factors are not less than a second wetting threshold value, the multi-angle inclined scratch cable insulation is in a heavily uneven wetting state;
wherein the first wetness threshold is 36 and the second wetness threshold is 156.
Referring to fig. 3, the embodiment of the application provides an insulation damp experiment evaluation device for a multi-angle inclined scratch cable, wherein the insulation damp experiment evaluation device for the multi-angle inclined scratch cable comprises a cable core 9 and a cable insulation 10 arranged outside the cable core 9, and comprises a current generator 2, a first high-voltage cable 4, a second high-voltage cable 3, a first high-voltage contact pole 5, a second high-voltage contact pole 6, a left fixing ring 7, a right fixing ring 8, a temperature sensor assembly and an upper computer processor 1;
the current generator 2 is connected with the first high-voltage contact pole 5 through the first high-voltage cable 4, the first high-voltage contact pole 5 is connected with the cable core 9 through the left fixing ring 7, the current generator 2 is connected with the second high-voltage contact pole 6 through the second high-voltage cable 3, and the second high-voltage contact pole 6 is connected with the cable core 9 through the right fixing ring 8;
the temperature sensor assembly is attached to the surface of the cable insulation 10 and connected with the upper computer processor 1.
The electric current that current generator 2 produced flows through first high tension cable 4, and the first high voltage contact utmost point 5 of 4 tail ends of first high tension cable is connected with cable core 9 through solid fixed ring 7 in the left side, and the electric current flows in through second high tension cable 3, and the second high voltage contact utmost point 6 of 3 tail ends of second high tension cable is connected with cable core 9 through solid fixed ring 8 in the right side.
Further, the temperature sensor assembly comprises 16 temperature sensors, and the 16 temperature sensors are uniformly distributed on the surface of the cable insulation in a 4 x 4 structure. The 16 temperature sensors are evenly arranged around the surface of the cable insulation 10. Wherein, the first temperature sensor 11, the third temperature sensor 15, the fifth temperature sensor 19 and the seventh temperature sensor 23 are evenly placed on the front surface midline along the cable axis, the second temperature sensor 12, the fourth temperature sensor 16, the sixth temperature sensor 20 and the eighth temperature sensor 24 are evenly placed on the lower surface midline along the cable axis, the ninth temperature sensor 13, the eleventh temperature sensor 17, the thirteenth temperature sensor 21 and the fifteenth temperature sensor 25 are evenly placed on the rear surface midline along the cable axis, and the tenth temperature sensor 14, the twelfth temperature sensor 18, the fourteenth temperature sensor 22 and the sixteenth temperature sensor 26 are evenly placed on the upper surface midline along the cable axis.
According to the technical scheme, the embodiment of the application provides a method and a device for evaluating the insulation damp experiment of a multi-angle inclined scratch cable, wherein the method comprises the following steps: acquiring the temperature of the insulating surface of a cable scratched in a multi-angle inclined mode for preset times within preset time, wherein the temperature of the insulating surface of the cable scratched in the multi-angle inclined mode is measured by a plurality of temperature sensors distributed on the insulating surface of the cable scratched in the multi-angle inclined mode, and every four adjacent temperature sensors form a rectangular area; calculating a standard weight matrix and a standard deviation matrix of each rectangular area within preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable; calculating a multi-angle inclined scratch wetting factor of each rectangular area within preset time according to the standard weight matrix and the standard deviation matrix; and evaluating the insulation damp state of the multi-angle inclined scratch cable according to the multi-angle inclined scratch damp factor. This application can carry out the aassessment of the situation of weing to the cable of insulating multi-angle slope fish tail.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. The method for evaluating the insulation damp experiment of the multi-angle inclined scratch cable is characterized by comprising the following steps of:
acquiring the temperature of the insulating surface of a cable scratched in a multi-angle inclined mode for preset times within preset time, wherein the temperature of the insulating surface of the cable scratched in the multi-angle inclined mode is measured by a plurality of temperature sensors distributed on the insulating surface of the cable scratched in the multi-angle inclined mode, and every four adjacent temperature sensors form a rectangular area;
calculating a standard weight matrix and a standard deviation matrix of each rectangular area within preset time according to the temperature of the insulating surface of the multi-angle inclined scratched cable;
calculating a multi-angle inclined scratch wetting factor of each rectangular area within preset time according to the standard weight matrix and the standard deviation matrix;
and evaluating the insulation damp state of the multi-angle inclined scratch cable according to the multi-angle inclined scratch damp factor.
2. The method as claimed in claim 1, wherein the number of the temperature sensors is 16, and 16 temperature sensors are uniformly distributed on the surface of the multi-angle inclined scratch cable insulation in a 4 x 4 structure.
3. The method as claimed in claim 2, further comprising calculating a formula of a standard weight matrix of each rectangular area in a preset time according to the temperature of the insulation surface of the multi-angle inclined scratched cable, wherein the formula comprises:
wherein D isjFor setting the time zone SjWeight matrix of Dj TFor setting the time zone SjWeight matrix D ofjThe transpose matrix of (a) is,is the square of the 2-norm of the matrix,for setting the time zone SjI is a 4 × 4 identity matrix.
4. The method as claimed in claim 2, further comprising calculating a standard deviation matrix formula of each rectangular area in a preset time according to the temperature of the insulation surface of the multi-angle inclined scratching cable as follows:
wherein Q isjFor setting the time zone SjThe deviation matrix of (a) is calculated,for setting the time zone SjOf a standard deviation matrix, Qj TFor setting the time zone SjDeviation matrix Q ofjThe transpose matrix of (a) is,is the matrix 2-norm squared, I is the 4 x 4 identity matrix.
5. The method according to claim 2, wherein the formula for calculating the multi-angle oblique scratch wetting factor of each rectangular area in a preset time according to the standard weight matrix and the standard deviation matrix is as follows:
wherein,for setting the time zone SjThe standard weight matrix of (a) is,for setting the time zone SjThe standard deviation matrix, | · | novision2Is a matrix 2-norm, | ·| luminanceFIs the matrix F-norm.
6. The method according to claim 2, wherein the step of evaluating the insulation moisture state of the multi-angle oblique scratch cable according to the multi-angle oblique scratch moisture factor comprises:
if the multi-angle inclined scratch wetting factors are not larger than a first wet threshold value, or at least 1 and not more than 8 multi-angle inclined scratch wetting factors are larger than the first wet threshold value and not larger than a second wet threshold value, the multi-angle inclined scratch cable insulation is in a slightly uneven wetting state;
if at least 1 and not more than 3 of the multi-angle inclined scratch wetting factors are not smaller than a second damp threshold value, or at least 9 and not more than 12 of the multi-angle inclined scratch wetting factors are larger than a first damp threshold value and not larger than a second damp threshold value, the multi-angle inclined scratch cable insulation is in a moderate uneven wetting state;
if at least 4 and no more than 12 multi-angle inclined scratch wetting factors are not less than a second wetting threshold value, the multi-angle inclined scratch cable insulation is in a heavily uneven wetting state;
wherein the first wetness threshold is 36 and the second wetness threshold is 156.
7. A multi-angle inclined scratch cable insulation damp experiment evaluation device is characterized by comprising a current generator, a first high-voltage cable, a second high-voltage cable, a first high-voltage contact pole, a second high-voltage contact pole, a left fixing ring, a right fixing ring, a temperature sensor assembly and an upper computer processor, wherein the cable core and the cable insulation arranged outside the cable core are included;
the current generator is connected with the first high-voltage contact pole through the first high-voltage cable, the first high-voltage contact pole is connected with the cable core through the left fixing ring, the current generator is connected with the second high-voltage contact pole through the second high-voltage cable, and the second high-voltage contact pole is connected with the cable core through the right fixing ring;
the temperature sensor assembly is attached to the insulated surface of the cable and connected with the upper computer processor.
8. The apparatus of claim 7, wherein the temperature sensor assembly comprises 16 temperature sensors, the 16 temperature sensors being evenly distributed on the surface of the cable insulation in a 4 x 4 configuration.
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