CN113108920B - Method for detecting 110kv voltage GIS disconnecting link based on DR imaging technology - Google Patents
Method for detecting 110kv voltage GIS disconnecting link based on DR imaging technology Download PDFInfo
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Abstract
The invention relates to a method for detecting a 110kv voltage GIS disconnecting link based on a DR imaging technology, which comprises the steps of continuously acquiring DR images of a plurality of GIS disconnecting links on a line to be detected; acquiring real-time temperatures of a plurality of GIS disconnecting links on a line to be detected; acquiring an angle value and time of each GIS disconnecting link from a first position to a second position, and calculating the angle change rate of each disconnecting link; acquiring the temperature change rate of the corresponding disconnecting link from the first position to the second position, and determining a detection value c according to the angle change rate kr and the temperature change rate kt of the disconnecting link; if the detection value is higher than a preset detection standard value C0, detecting the corresponding disconnecting link; obtain the knife switch angle rate of change and obtain the temperature rate of change of corresponding knife switch according to infrared device through DR formation of image to confirm the unusual of the knife switch on the detection circuitry through the quick calculation of detected value, confirm fast and detect the trouble knife switch on the circuit, be convenient for fix a position trouble knife switch fast, improve and detect efficiency.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a 110kv voltage GIS disconnecting link detection method based on a DR imaging technology.
Background
GIS equipment is a GAS Insulated totally-enclosed combined electrical apparatus, GIS is called GAS Insulated switched capacitor for short, and the equipment is widely applied to the high-voltage and ultrahigh-voltage fields, and sometimes even applied to the ultrahigh-voltage field. In the conventional non-closed or open type transformer substation, the occupied area is large, the structure is scattered, the safety and reliability are poor, the installation is troublesome, the environment is also required to be higher, and in addition, the maintenance and repair of the open type transformer substation also occupy quite large workload. The GIS equipment makes good use of the advantages and avoids the disadvantages, not only overcomes the defects of the open-type transformer substation, but also greatly prolongs the maintenance time interval of the main components.
With the rapid development of economy, the demands of production electricity, commercial electricity and residential electricity of enterprises are continuously increased. Modern electrical equipment, such as GIS, is also constantly being updated, but machines and equipment are also life-long. When the device runs for a certain time, the problems can be avoided, and the service life of the device and the maintenance time interval can be prolonged only by continuously improving the technologies such as design, process and the like and further researching and developing new materials. An important component of the GIS device is a GIS switch, and although the GIS device is filled with SF6 insulating gas with a certain pressure, the GIS device still has many defects in design, material, process and other aspects, so that the GIS device, especially the GIS switch, is very important for real-time monitoring.
However, the states of a plurality of GIS switches are monitored in real time, and when a fault occurs in a switch at a certain position, the investigation of all power grids is caused, so that the detection efficiency is low.
Disclosure of Invention
Therefore, the invention provides a 110kv voltage GIS disconnecting link detection method based on a DR imaging technology, which can solve the problem of low disconnecting link detection efficiency.
In order to achieve the purpose, the invention provides a method for detecting a 110kv voltage GIS disconnecting link based on a DR imaging technology, which comprises the steps of continuously acquiring DR images of a plurality of GIS disconnecting links on a line to be detected by using a DR camera device;
acquiring real-time temperatures of a plurality of GIS disconnecting links on a line to be detected by using an infrared device;
respectively processing the DR images, acquiring the angle value and the time of each GIS disconnecting link from the first position to the second position, and calculating the angle change rate of each disconnecting link;
sequencing the multiple disconnecting links according to the angle change rate of the disconnecting links from large to small to obtain a first sequence on the line to be detected;
respectively acquiring the temperature change rate of the corresponding disconnecting link from the first position to the second position according to the sequence, and determining a detection value c according to the angle change rate kr and the temperature change rate kt of the disconnecting link at any time;
if the detection value is higher than a preset detection standard value C0, detecting the corresponding disconnecting link;
if the detection value is higher than a preset detection standard value C0, detecting the corresponding disconnecting link comprises the following steps: setting a first detection duration j1, a second detection duration j2, a third detection duration j3 and a fourth detection duration j4, and j1< j2< j3< j 4;
if the detection value C is larger than or equal to a preset detection standard value C0 in the 1.05 × C0, detecting the corresponding disconnecting link by adopting a first detection duration j 1;
if the detected value C of 1.5 × C0> is not less than 1.05 × C0, detecting the corresponding disconnecting link by adopting a second detection time length j 2;
if the detected value C of 1.95 × C0> is not less than 1.5 × C0, detecting the corresponding disconnecting link by adopting a third detection time length j 3;
and if the detection value C is more than or equal to 1.95 multiplied by C0, detecting the corresponding disconnecting link by adopting a fourth detection time length j 4.
Further, the processing the DR images respectively includes:
carrying out binarization processing on the image;
acquiring the base point position information and the outline information of the disconnecting link on the processed image;
determining whether the base points of the two disconnecting links are on the reference line at the first position and the second position and whether the profile of the disconnecting link reaches the preset position within the preset time by taking the connecting line of the base points of any two disconnecting links as the reference line;
if other disconnecting links deviate from the reference line, readjusting the selection of the reference line to enable the base points of more disconnecting links to fall on the reference line;
and then comparing the adjusted image with the deviation angle of the disconnecting link in the pre-stored standard image to determine the angle change rate of the disconnecting link.
Further, the calculation formula for determining the detection value c from the angle change rate kr and the temperature change rate kt of the knife gate is "a × kr + b × kt", where a is an angle coefficient, b is a temperature coefficient, and a + b is "1".
Further, if the degree of influence of the angle change rate and the temperature change rate on the detection value is the same, a is 0.5;
if the angle change rate has a large influence on the detection value with respect to the temperature change rate, a is 0.8 and b is 0.2;
if the temperature change rate has a large influence on the detection value with respect to the angle change rate, a is 0.2 and b is 0.8.
Further, when the angle change rate of each knife switch is calculated, the angle change rate of the knife switch is corrected according to the service life of the knife switch, and if the service life of the knife switch is less than or equal to 1 year, the angle change rate of the knife switch is corrected by adopting a first coefficient k 1;
if the service life of the disconnecting link is less than or equal to 3 years after 1 year, correcting the angle change rate of the disconnecting link by adopting a second coefficient k 2;
if the service life of the knife switch is more than 3 years, the angle change rate of the knife switch is corrected by adopting a third coefficient k 3.
Further, each of the first coefficient k1, the second coefficient k2, and the third coefficient k3 is greater than 0 and smaller than 1, and the first coefficient k1 is 2/5, the second coefficient k2 is 3/5, and the third coefficient k3 is 1/5.
Further, when the real-time temperatures of a plurality of GIS disconnecting links on a line to be detected are obtained by using an infrared device, the real-time temperatures of the disconnecting links are corrected according to the materials of the disconnecting links, if the iron content of the disconnecting links is less than or equal to 50%, the real-time temperatures are increased by 1-2 degrees, and if the iron content of the disconnecting links is greater than 50%, the real-time temperatures are reduced by 1-2 degrees.
Further, the first detection duration j1 is k3 × TO, where TO is the detection value, and is the corresponding detection duration when the detection value is the standard detection value;
the second detection duration j2 is k1 × TO;
the third detection duration j3 is k2 × TO;
the fourth detection duration j4 is TO.
Compared with the prior art, the method has the advantages that the angle change rate of the disconnecting link is obtained through DR imaging, the temperature change rate of the corresponding disconnecting link is obtained according to an infrared device, the abnormity of the disconnecting link on the detection line is determined through rapid calculation of the detection value, the fault disconnecting link on the line to be detected is rapidly determined, the fault disconnecting link is conveniently and rapidly positioned, and the detection efficiency is improved.
Particularly, the image is subjected to binarization processing, so that the selection of the knife switch base points and the determination of the outline are more accurate, the interference of other objects is reduced, and the accuracy of the judgment of the angle and the position of the knife switch is improved.
Particularly, when the detection value is determined, the temperature change rate of the knife switch is determined according to the sequence of the angle change rate after the angle change rate is ranked from large to small, the detection value c can be obtained according to a calculation formula when the angle change rate and the temperature change rate of the knife switch are obtained, the influence weights of the angle change rate and the temperature change rate on the detection value are different, the size of the detection value of the knife switch directly determines whether the knife switch needs to be detected and whether the knife switch has threat on a system, the calculation of the detection value c is more accurate by adding the angle change rate, the angle weight coefficient, the temperature change rate and the temperature weight coefficient, a is 0.5 if the angle change rate and the temperature change rate have the same influence degree on the detection value, b is 0.8 if the angle change rate and the temperature change rate have the larger influence on the detection value, and a is 0.2 if the temperature change rate has the larger influence on the detection value, then a is 0.2 and b is 0.8, and the detection value in the embodiment of the present invention is formed based on the angle change rate and the temperature change rate, thereby improving the accuracy of the estimation of the detection value.
In particular, if the service life of the knife switch is different, the sensitivity of the knife switch is increased along with the service life, and the sensitivity of the knife switch for the action execution is reduced, and the sensitivity of the knife switch may be distributed positively in the service process of the knife switch, that is, the sensitivity tends to increase first and then decrease along with the service life, or the sensitivity may gradually decrease along with the service life, so that different coefficients are set in different service lives to correct the angle change rate of the knife switch, and in the embodiment of the invention, the sensitivity of the knife switch is the highest when the service life is 1 to 3 years. And the angle change rate of the disconnecting link is corrected according to the sensitivity of the disconnecting link at different time stages, so that the angle change rate of the disconnecting link is more consistent with the actual service time, the calculation of the detection degree is more accurate, and the detection precision is improved.
Particularly, the sensitivity of the knife switch is positively distributed in the use process of the knife switch, namely, the sensitivity tends to increase firstly and then decrease along with the increase of the use time, and in the embodiment of the invention, the sensitivity of the knife switch is the highest when the use time is 1 to 3 years. And the angle change rate of the disconnecting link is corrected according to the sensitivity of the disconnecting link at different time stages, so that the angle change rate of the disconnecting link is more consistent with the actual service time, the calculation of the detection degree is more accurate, and the detection precision is improved.
Particularly, when the temperature of the disconnecting link is detected, when the position of the disconnecting link is changed at a certain angle, if the material of the disconnecting link is high in iron content, the sensitivity of the temperature is low, therefore, when the real-time temperature is determined, in order to improve the accuracy of the temperature, the detected temperature is reduced by 1-2 degrees and then is used as the actual detection temperature of the disconnecting link, if the iron content is low, the sensitivity of the temperature is relatively high, in order to improve the accuracy of the temperature, the detected temperature is increased by 1-2 degrees and then is used as the actual detection temperature of the disconnecting link, and the detection temperature is adjusted based on the material of the disconnecting link, so that the determination of the temperature change rate is more accurate, and the accuracy of the detection degree is improved.
In particular, by setting a situation in which different detection durations are set according to how much the detection value exceeds the detection criterion value C0 in the case where the detection value is higher than the preset detection criterion value C0, if the detection value does not exceed the detection criterion value C0 much, the detection duration employed is short, and since a low detection level indicates a low threat to the power grid, the probability of occurrence of a fault is not great, and if the detection value exceeds the detection criterion value C0 much. The fault rate of the corresponding disconnecting link is high, and detection is needed to determine whether the disconnecting link is replaced or maintained, so that the problems caused by the fault of the disconnecting link are prevented in advance, manpower is conveniently mobilized for rush repair, and the safety of the power grid is improved.
Particularly, the detection duration is based on the detection duration corresponding to the standard detection value C0, and on the basis, the first coefficient, the second coefficient and the third coefficient are respectively used as the correction coefficients of the second detection duration, the third detection duration and the first detection duration, so that the detection time allocated to the switches with different detection values is different, the detection duration is saved, and the detection efficiency is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for detecting a 110kv voltage GIS disconnecting link based on a DR imaging technology according to an embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, fig. 1 is a flowchart of a method for detecting a 110kv voltage GIS disconnecting link based on a DR imaging technology according to an embodiment of the present invention, where the method for detecting a 110kv voltage GIS disconnecting link based on a DR imaging technology includes:
s100, continuously acquiring DR images of a plurality of GIS disconnecting links on a line to be detected by using a DR camera device;
s200, acquiring real-time temperatures of a plurality of GIS disconnecting links on a line to be detected by using an infrared device;
step S300, the DR images are respectively processed, the angle value and the time of each GIS disconnecting link from the first position to the second position are obtained, and the angle change rate of each disconnecting link is calculated;
s400, sequencing the multiple disconnecting links according to the angle change rate of the disconnecting links from large to small to obtain a first sequence on the line to be detected;
step S500, respectively obtaining the temperature change rate of the corresponding disconnecting link from the first position to the second position according to the sequence, and determining a detection value c according to the angle change rate kr and the temperature change rate kt of the disconnecting link at any moment;
and S600, if the detection value is higher than a preset detection standard value C0, detecting the corresponding disconnecting link.
Specifically, according to the method for detecting the 110kv voltage disconnecting link based on the DR imaging technology provided by the embodiment of the invention, the angle change rate of the disconnecting link is obtained through DR imaging, the temperature change rate of the corresponding disconnecting link is obtained according to an infrared device, the abnormality of the disconnecting link on the detection line is determined through rapid calculation of the detection value, the fault disconnecting link on the line to be detected is rapidly determined, the fault disconnecting link is conveniently and rapidly positioned, and the detection efficiency is improved.
Specifically, in step S300, the processing of the DR images respectively includes:
carrying out binarization processing on the image;
acquiring the base point position information and the outline information of the disconnecting link on the processed image;
determining whether the base points of the two disconnecting links are on the reference line at the first position and the second position and whether the profile of the disconnecting link reaches the preset position within the preset time by taking the connecting line of the base points of any two disconnecting links as the reference line;
if other disconnecting links deviate from the reference line, readjusting the selection of the reference line to enable the base points of more disconnecting links to fall on the reference line;
and then comparing the adjusted image with the deviation angle of the disconnecting link in the pre-stored standard image to determine the angle change rate of the disconnecting link.
Particularly, the image is subjected to binarization processing, so that the selection of a knife switch base point and the determination of the outline are more accurate, the interference of other objects is reduced, the accuracy of the judgment of the angle and the position of the knife switch is improved, more knife switch base points and reference lines are overlapped by adjusting the reference lines when the standard image is detected, more accurate comparison and analysis are conveniently carried out on the deviation angle of the knife switch, and the accuracy of the calculation of the angle change rate is improved.
Specifically, the calculation formula used to determine the detection value c from the angle change rate kr and the temperature change rate kt of the knife gate is c ═ a × kr + b × kt, where a is the angle coefficient, b is the temperature coefficient, and a + b is 1.
Specifically, when the detection value is determined, the temperature change rate of the knife switch is determined according to the sequence of the angle change rate after the angle change rate is sorted from large to small, the detection value c can be obtained according to a calculation formula when the angle change rate and the temperature change rate of the knife switch are obtained, the influence weights of the angle change rate and the temperature change rate on the detection value are different, the size of the detection value of the knife switch directly determines whether the knife switch needs to be detected and whether the knife switch has threat on a system, the calculation of the detection value c is more accurate by adding the angle change rate, the angle weight coefficient, the temperature change rate and the temperature weight coefficient, a is 0.5 if the angle change rate and the temperature change rate have the same influence degree on the detection value, b is 0.8 if the angle change rate and the temperature change rate have the larger influence on the detection value, and a is 0.2 if the temperature change rate has the larger influence on the detection value, then a is 0.2 and b is 0.8, and the detection value in the embodiment of the present invention is formed based on the angle change rate and the temperature change rate, thereby improving the accuracy of the estimation of the detection value.
Specifically, if the degree of influence of the angle change rate and the temperature change rate on the detection value is the same, a is 0.5;
if the angle change rate has a large influence on the detection value with respect to the temperature change rate, a is 0.8 and b is 0.2;
if the temperature change rate has a large influence on the detection value with respect to the angle change rate, a is 0.2 and b is 0.8.
Specifically, the detection value in the embodiment of the invention is formed based on the angle change rate and the temperature change rate, and the evaluation accuracy of the detection value is improved.
Specifically, when the angle change rate of each knife switch is calculated, the angle change rate of the knife switch is corrected according to the service life of the knife switch, and if the service life of the knife switch is less than or equal to 1 year, the angle change rate of the knife switch is corrected by adopting a first coefficient k 1;
if the service life of the disconnecting link is less than or equal to 3 years after 1 year, correcting the angle change rate of the disconnecting link by adopting a second coefficient k 2;
if the service life of the knife switch is more than 3 years, the angle change rate of the knife switch is corrected by adopting a third coefficient k 3.
Specifically, in the practical application process, if the service life of the knife switch is different, the sensitivity of the knife switch will decrease with the increase of the service time, and the sensitivity of the knife switch may be distributed positively in the service process of the knife switch, that is, the sensitivity tends to increase first and decrease later with the increase of the service time, or the sensitivity may gradually decrease with the increase of the service time, so that different coefficients are set at different service lives to correct the angle change rate of the knife switch, and in the embodiment of the present invention, the sensitivity of the knife switch is the highest when the service time is 1 to 3 years. And the angle change rate of the disconnecting link is corrected according to the sensitivity of the disconnecting link at different time stages, so that the angle change rate of the disconnecting link is more consistent with the actual service time, the calculation of the detection degree is more accurate, and the detection precision is improved.
Specifically, each of the first coefficient k1, the second coefficient k2, and the third coefficient k3 is greater than 0 and smaller than 1, and the first coefficient k1 is 2/5, the second coefficient k2 is 3/5, and the third coefficient k3 is 1/5.
Specifically, in the use process of the knife switch in the embodiment of the present invention, the sensitivity of the knife switch is positively distributed, that is, the sensitivity tends to increase first and then decrease as the use time increases, and in the embodiment of the present invention, the sensitivity of the knife switch is the highest when the use time is 1 to 3 years. And the angle change rate of the disconnecting link is corrected according to the sensitivity of the disconnecting link at different time stages, so that the angle change rate of the disconnecting link is more consistent with the actual service time, the calculation of the detection degree is more accurate, and the detection precision is improved.
Specifically, when the real-time temperatures of a plurality of GIS disconnecting links on a line to be detected are obtained by an infrared device, the real-time temperatures of the disconnecting links are corrected according to the materials of the disconnecting links, if the iron content of the disconnecting links is less than or equal to 50%, the real-time temperatures are increased by 1-2 degrees, and if the iron content of the disconnecting links is greater than 50%, the real-time temperatures are reduced by 1-2 degrees.
Specifically, when the temperature of the disconnecting link is detected, and when the position of the disconnecting link is changed at a certain angle, if the material of the disconnecting link is high in iron content, the sensitivity of the temperature is low, so that when the real-time temperature is determined, in order to improve the accuracy of the temperature, the detected temperature is reduced by 1-2 degrees and then is used as the actual detection temperature of the disconnecting link, if the iron content is low, the sensitivity of the temperature is relatively high, in order to improve the accuracy of the temperature, the detected temperature is increased by 1-2 degrees and then is used as the actual detection temperature of the disconnecting link, and the detection temperature is adjusted based on the material of the disconnecting link, so that the determination of the temperature change rate is more accurate, and the accuracy of the detection degree is improved.
Specifically, if the detection value is higher than a preset detection standard value C0, detecting the corresponding knife switch includes: setting a first detection duration j1, a second detection duration j2, a third detection duration j3 and a fourth detection duration j4, and j1< j2< j3< j 4;
if the detection value C is larger than or equal to a preset detection standard value C0 in the 1.05 × C0, detecting the corresponding disconnecting link by adopting a first detection duration j 1;
if the detected value C of 1.5 × C0> is not less than 1.05 × C0, detecting the corresponding disconnecting link by adopting a second detection time length j 2;
if the detected value C of 1.95 × C0> is not less than 1.5 × C0, detecting the corresponding disconnecting link by adopting a third detection time length j 3;
and if the detection value C is more than or equal to 1.95 multiplied by C0, detecting the corresponding disconnecting link by adopting a fourth detection time length j 4.
Specifically, in the embodiment of the present invention, in the case that the detection value is higher than the preset detection standard value C0, in the situation of setting, different detection durations are set according to how much the detection value exceeds the detection standard value C0, if the detection value exceeds the detection standard value C0, the adopted detection duration is shorter, since the low detection level indicates that the threat to the power grid is not great, the probability of failure is not great, and if the detection value exceeds the detection standard value C0, the probability of failure is great. The fault rate of the corresponding disconnecting link is high, and detection is needed to determine whether the disconnecting link is replaced or maintained, so that the problems caused by the fault of the disconnecting link are prevented in advance, manpower is conveniently mobilized for rush repair, and the safety of the power grid is improved.
Specifically, where the first detection duration j1 is k3 × TO, where TO is a detection value that is a standard detection value is a corresponding detection duration;
the second detection duration j2 is k1 × TO;
the third detection duration j3 is k2 × TO;
the fourth detection duration j4 is TO.
Specifically, in the embodiment of the present invention, the detection duration is based on the detection duration corresponding to the standard detection value C0, and on this basis, the first coefficient, the second coefficient, and the third coefficient are respectively used as the correction coefficients of the second detection duration, the third detection duration, and the first detection duration, so that the detection times allocated to the switches with different detection values are different, the detection duration is saved, and the detection efficiency is improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for detecting a 110kv voltage GIS disconnecting link based on a DR imaging technology is characterized by comprising the following steps:
continuously acquiring DR images of a plurality of GIS disconnecting links on a line to be detected by using a DR camera device;
acquiring real-time temperatures of a plurality of GIS disconnecting links on a line to be detected by using an infrared device;
respectively processing the DR images, acquiring the angle value and the time of each GIS disconnecting link from the first position to the second position, and calculating the angle change rate of each disconnecting link;
sequencing the multiple disconnecting links according to the angle change rate of the disconnecting links from large to small to obtain a first sequence on the line to be detected;
respectively acquiring the temperature change rate of the corresponding disconnecting link from the first position to the second position according to the sequence, and determining a detection value c according to the angle change rate kr and the temperature change rate kt of the disconnecting link at any time;
if the detection value is higher than a preset detection standard value C0, detecting the corresponding disconnecting link;
if the detection value is higher than a preset detection standard value C0, detecting the corresponding disconnecting link comprises the following steps: setting a first detection duration j1, a second detection duration j2, a third detection duration j3 and a fourth detection duration j4, and j1< j2< j3< j 4;
if the detection value C is larger than or equal to a preset detection standard value C0 in the 1.05 × C0, detecting the corresponding disconnecting link by adopting a first detection duration j 1;
if the detected value C of 1.5 × C0> is not less than 1.05 × C0, detecting the corresponding disconnecting link by adopting a second detection time length j 2;
if the detected value C of 1.95 × C0> is not less than 1.5 × C0, detecting the corresponding disconnecting link by adopting a third detection time length j 3;
if the detection value C is larger than or equal to 1.95 multiplied by C0, detecting the corresponding disconnecting link by adopting a fourth detection time length j 4;
the processing of the DR images includes:
carrying out binarization processing on the image;
acquiring the base point position information and the outline information of the disconnecting link on the processed image;
determining whether the base points of the two disconnecting links are on the reference line at the first position and the second position and whether the profile of the disconnecting link reaches the preset position within the preset time by taking the connecting line of the base points of any two disconnecting links as the reference line;
if other disconnecting links deviate from the reference line, readjusting the selection of the reference line to enable the base points of more disconnecting links to fall on the reference line;
and then comparing the adjusted image with the deviation angle of the disconnecting link in the pre-stored standard image to determine the angle change rate of the disconnecting link.
2. The method for detecting a 110kv voltage GIS switch based on DR imaging technology as claimed in claim 1, wherein the calculation formula for determining the detection value c according to the angle change rate kr and the temperature change rate kt of the switch is c ═ a × kr + b × kt, where a is an angle coefficient, b is a temperature coefficient, and a + b is 1.
3. The method for detecting the 110kv voltage GIS disconnecting link based on DR imaging technology of claim 2, wherein if the degree of influence of the angle change rate and the temperature change rate on the detection value is the same, a-b-0.5;
if the angle change rate has a large influence on the detection value with respect to the temperature change rate, a is 0.8 and b is 0.2;
if the temperature change rate has a large influence on the detection value with respect to the angle change rate, a is 0.2 and b is 0.8.
4. The method for detecting the 110kv voltage GIS disconnecting link based on DR imaging technology in claim 1,
when the angle change rate of each knife switch is calculated, the angle change rate of the knife switch is corrected according to the service life of the knife switch, and if the service life of the knife switch is less than or equal to 1 year, the angle change rate of the knife switch is corrected by adopting a first coefficient k 1;
if the service life of the disconnecting link is less than or equal to 3 years after 1 year, correcting the angle change rate of the disconnecting link by adopting a second coefficient k 2;
if the service life of the knife switch is more than 3 years, the angle change rate of the knife switch is corrected by adopting a third coefficient k 3.
5. The method for detecting the 110kv voltage GIS knife switch based on DR imaging technology of claim 4, wherein the first coefficient k1, the second coefficient k2 and the third coefficient k3 are all greater than 0 and less than 1, and the first coefficient k1 is 2/5, the second coefficient k2 is 3/5, and the third coefficient k3 is 1/5.
6. The method for detecting the 110kv voltage GIS disconnecting link based on DR imaging technology in claim 1,
when the real-time temperatures of a plurality of GIS disconnecting links on a line to be detected are obtained by using an infrared device, the real-time temperatures of the disconnecting links are corrected according to the materials of the disconnecting links, if the iron content of the disconnecting links is less than or equal to 50%, the real-time temperatures are increased by 1-2 degrees, and if the iron content of the disconnecting links is greater than 50%, the real-time temperatures are reduced by 1-2 degrees.
7. The method for detecting the 110kv voltage GIS disconnecting link based on DR imaging technology in claim 1,
the first detection duration j1 is k3 × TO, wherein TO is the detection value, and is the corresponding detection duration when the detection value is the standard detection value;
the second detection duration j2 is k1 × TO;
the third detection duration j3 is k2 × TO;
the fourth detection duration j4 is TO.
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| JP2982496B2 (en) * | 1992-06-25 | 1999-11-22 | 日新電機株式会社 | Method of detecting abnormal overheating of gas insulated switchgear |
| CN101839870A (en) * | 2010-03-31 | 2010-09-22 | 青海电力科学试验研究院 | X-ray radiographic digital imaging detection method for power grid GIS (Geographic Information System) equipment |
| CN104113001A (en) * | 2013-04-19 | 2014-10-22 | 衢州电力局 | Air-insulation enclosed metal switch equipment fault diagnosis device based on image identification |
| CN103995172B (en) * | 2014-06-04 | 2017-01-18 | 广东电网公司佛山供电局 | Method for on-line monitoring of load current of GIS bus of substation |
| CN109559929A (en) * | 2018-11-23 | 2019-04-02 | 国网山东省电力公司日照供电公司 | A kind of disconnecting link state collecting device |
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| CN110717897A (en) * | 2019-09-24 | 2020-01-21 | 南京鑫和汇通电子科技有限公司 | Split type disconnecting link opening and closing angle detection method based on rapid midline determining model |
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| CN111856262A (en) * | 2020-07-16 | 2020-10-30 | 广东电网有限责任公司 | GIS disconnecting link detection method, device, system, equipment and storage medium |
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