CN115684797A - Transformer monitoring and fault diagnosis analysis method - Google Patents
Transformer monitoring and fault diagnosis analysis method Download PDFInfo
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- CN115684797A CN115684797A CN202211360105.9A CN202211360105A CN115684797A CN 115684797 A CN115684797 A CN 115684797A CN 202211360105 A CN202211360105 A CN 202211360105A CN 115684797 A CN115684797 A CN 115684797A
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Abstract
The invention discloses a transformer monitoring and fault diagnosis analysis method, which effectively solves the problem of limitation of the current transformer fault diagnosis by monitoring the internal information and the external information of a transformer conservator and respectively obtaining an external fault evaluation coefficient and an internal fault evaluation coefficient corresponding to a target transformer conservator, thereby ensuring the operation safety of a transformer, avoiding damage to the transformer, reducing the diagnosis workload of the transformer, simultaneously improving the use efficiency and the service life of the transformer conservator, reducing the risk of transformer oil body leakage, simultaneously improving the rationality and the scientificity of the transformer monitoring diagnosis, slowing down the degradation speed of oil to a certain extent, enhancing the insulation strength of the transformer conservator, simultaneously effectively preventing the occurrence and the development of transformer conservator faults and avoiding certain potential safety hazards.
Description
Technical Field
The invention relates to the technical field of transformer fault diagnosis, in particular to a transformer monitoring and fault diagnosis analysis method.
Background
Along with the continuous expansion of the scale of a power grid, the requirement of China on a transformer is continuously increased, meanwhile, the requirement on the operation safety of the transformer is continuously improved, and the oil conservator is used as an important component of the transformer, so that the monitoring significance on the oil conservator of the transformer is self-evident.
At present, the monitoring of a transformer conservator is mainly centralized on an oil level and an oil body, the sealing performance and the internal operation state of the transformer conservator also have a great influence on the operation work of a transformer, the current monitoring mode is relatively general, certain limitations exist, and the monitoring mode is specifically embodied in the following layers;
1. the oil mass condition and the pressure condition of the conservator air bag reflect the sealing performance of the conservator air bag, so that the operation safety of the transformer is integrally influenced, the monitoring of the sealing layer surface of the conservator of the transformer is not considered at present, the leakage of the transformer oil body is easily caused, the operation fault of the transformer is further caused, the use safety of the conservator air bag cannot be improved, the reference value of monitoring and judging is not high, and the use efficiency and the service life of the transformer are reduced to a certain extent;
2. the method belongs to a mode of manually diagnosing the transformer fault, is poor in scientificity and rationality, has strong subjectivity and low diagnosis efficiency, and is not strong in coverage and high in diagnosis strength in a manual diagnosis mode;
3. the concentration of gas inside the gas relay is used as one of important judgment bases for internal faults of the transformer, the internal fault condition of the transformer is directly reflected, the gas relay is not monitored and analyzed at present, accidents cannot be effectively prevented, and the life safety of workers of the transformer cannot be guaranteed;
4. the gasbag is as the important component part of transformer conservator, does not monitor the gasbag at present, and the operation safety of obtaining the transformer can't effectual timely monitoring can't slow down the degradation speed of oil to a certain extent, has reduced the conservator dielectric strength of transformer.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a transformer monitoring and fault diagnosis analysis method, which comprises the following specific technical scheme:
a transformer monitoring and fault diagnosis analysis method comprises the following steps:
step one, monitoring appearance information of a transformer conservator: monitoring appearance information of a target transformer conservator through a distributed high-definition camera, wherein the appearance information corresponding to the target transformer conservator comprises shell crack information, cable aging information and pipeline deformation information;
step two, analyzing the appearance fault of the transformer conservator: analyzing the appearance information of the target transformer conservator to obtain an appearance fault evaluation coefficient corresponding to the target transformer conservator;
step three, primarily diagnosing faults of the transformer conservator: preliminarily diagnosing an appearance fault evaluation coefficient corresponding to the target transformer conservator, executing a seventh step if the target transformer conservator is an appearance fault conservator, and executing a fourth step if the target transformer conservator is a normal-appearance conservator;
monitoring the internal information of the transformer conservator: monitoring internal information corresponding to a target transformer conservator, wherein the internal information corresponding to the target transformer conservator comprises conservator airbag information and gas relay information;
step five, analyzing the internal fault of the transformer conservator: analyzing the internal information of the target transformer conservator to obtain an internal fault evaluation coefficient corresponding to the target transformer conservator;
step six, diagnosing the fault depth of the transformer conservator: deep diagnosis is carried out on the internal fault evaluation coefficient corresponding to the target transformer conservator, and if the target transformer conservator is the internal fault conservator, the seventh step is executed;
seventhly, early warning display terminal: and carrying out early warning display on the appearance fault or the internal fault corresponding to the target transformer conservator.
According to a preferred embodiment, the casing crack information of the transformer conservator targeted in the first step includes the number of casing cracks and the longest crack length, the cable aging information includes the number of cracks of each cable sheath, the longest crack length, the chromaticity of each cable sheath body and the number of drops of each cable sheath, and the pipeline deformation information includes a pipeline distortion contour, the number of pipe breaks and the maximum damaged area.
According to a preferred embodiment, in the second step, the appearance information of the target transformer conservator is analyzed, and the specific analysis process is as follows:
a1, obtaining shell crack information, and recording the longest crack length of the shell as L max ；
A2, obtaining cable aging information, and recording the longest crack length of each cable sheath as Q max i I denotes the number corresponding to each cable jacket, i =1,2, ·... M,;
a3, acquiring deformation information of the pipeline, and recording the maximum rupture area of the pipeline as S max Extracting the pipeline distortion contour from the pipeline information, performing coincidence comparison on the pipeline distortion contour and a preset standard pipeline contour, and utilizing a calculation formula
Calculating the distortion degree of the pipeline
V is expressed as the area of the overlapping pipeline profile, V' is expressed as the area of the set standard pipeline profile, V 1 Expressing the degree of the superposition as a set reference degree of the superposition, and further extracting the degree of the distortion of the pipeline from the superposition;
and A4, analyzing the appearance fault of the target transformer conservator according to the longest crack length of the shell, the longest crack length of the cable sheath, the largest fracture area of the pipeline and the distortion degree of the pipeline.
According to a preferred embodiment, the analyzing the appearance fault of the target transformer conservator comprises the following steps:
b1, extracting the number of shell cracks and the longest shell crack length corresponding to the target transformer conservator from the shell crack information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a shell fault evaluation coefficient alpha corresponding to the target transformer conservator, wherein L 1 Expressed as the number of cracks in the shell of the target transformer conservator, L' 1 L' is respectively expressed as the number of allowed housing cracks of the set transformer conservator and the allowed housing crack length, b1 and b2 are respectively expressed as the balance influence factors corresponding to the number of the set housing cracks and the housing crack length, and b1+ b2=1;
b2, extracting the cable sheath crack corresponding to the target transformer conservator from the cable aging information of the target transformer conservatorThe number of the cracks, the length of the longest crack, the chroma and the number of the falling parts are calculated by using a calculation formula
Calculating to obtain a cable fault evaluation coefficient beta corresponding to the target transformer conservator, wherein Q 1 i 、Q 2 i 、Q 3 i Respectively expressed as the number of i-th cable sheath cracks, the main body chromaticity and the number of falling parts, Q ' and Q ' of the target transformer conservator ' 1 、Q′ 2 、Q′ 3 Respectively representing the permitted cable sheath crack length, the permitted cable sheath crack number, the standard chromaticity and the permitted shedding number of the set transformer conservator, wherein a1, a2, a3 and a4 respectively represent balance influence factors corresponding to the set crack number, crack length, chromaticity and shedding number, a1+ a2+ a3+ a4=1, and iota represents a correction factor;
b3, extracting the pipeline distortion degree, the pipeline fracture number and the maximum fracture area corresponding to the target transformer conservator from the pipeline deformation information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a pipeline fault evaluation coefficient eta corresponding to the target transformer conservator, wherein S 1 、S 2 Respectively expressed as the pipe distortion degree and the number of pipe fracture parts, S 'of the target transformer conservator' 1 、S′ 2 S' represents an allowable pipe bending degree, an allowable pipe breakage number, and an allowable pipe breakage area of the set transformer conservator, respectively, Δ S represents a set reference bending angle difference, h1, h2, and h3 represent balance influence factors corresponding to the set pipe bending degree, the pipe breakage number, and the pipe breakage area, respectively, and h1+ h2+ h3=1;
b4, based on the shell fault evaluation coefficient, the cable fault evaluation coefficient and the pipeline fault evaluation coefficient corresponding to the target transformer conservator, calculating formulas are utilized
And calculating to obtain an appearance fault evaluation coefficient χ corresponding to the target transformer conservator, wherein c1, c2 and c3 are respectively expressed as weight factors corresponding to the set target transformer conservator shell fault, cable fault and pipeline fault, and c1+ c2+ c3=1.
According to a preferred embodiment, in the third step, the appearance fault evaluation coefficient corresponding to the target transformer conservator is preliminarily diagnosed, and the specific diagnosis process is as follows:
and comparing the appearance fault evaluation coefficient corresponding to the target transformer conservator with the set transformer conservator appearance fault evaluation coefficient, if the appearance fault evaluation coefficient corresponding to the target transformer conservator is greater than or equal to the set transformer conservator appearance fault evaluation coefficient, judging that the transformer conservator is an appearance fault conservator, and if the appearance fault evaluation coefficient corresponding to the target transformer conservator is less than the set transformer conservator appearance fault evaluation coefficient, judging that the transformer conservator is a normal-appearance conservator.
According to a preferred embodiment, the internal information corresponding to the target transformer conservator is monitored in the fourth step, and the specific monitoring process is as follows:
repeatedly filling the same volume of gas into the target transformer conservator air bag for multiple times, and monitoring the oil level height of each filled gas to obtain the corresponding oil level height of each filled gas;
starting a motor to operate, detecting the volume of the gas relay, pressurizing the gas relay through a pressurizing pump to a set value, setting a pressure monitoring time point when the gas relay is pressurized to the set value, and monitoring the internal pressure value of the gas relay when the gas relay reaches the pressure monitoring time point;
and taking the oil level height of the target transformer conservator air bag, the volume capacity of the gas relay and the internal pressure value as the internal information corresponding to the target transformer conservator.
According to a preferred embodiment, the internal fault evaluation coefficient corresponding to the target transformer conservator in the fifth step is calculated as follows:
c1, corresponding to the inner part of the oil conservator of the slave target transformerExtracting the oil level height of the air bag from the information, screening to obtain the highest oil level height and the lowest oil level height, calculating by using a mean value to obtain an average oil level height, and calculating by using a calculation formula
Calculating to obtain an air bag fault evaluation coefficient delta corresponding to the target transformer conservator, wherein j represents a number corresponding to each gas injection frequency, and j =1,2 1 Expressed as a set bladder initial oil level height, W 1 j Expressed as the height of the oil level of the air bag corresponding to the j-th filling of the same volume of gas, W 0 Expressed as a difference in the height of the air bag-permitted oil level set, e is expressed as a natural constant, W max Expressed as maximum oil level, W min Expressed as the height of the lowest oil level,
expressed as an average oil level height, W' expressed as a set oil level uniformity, s1 and s2 expressed as weight factors corresponding to the oil level height and the oil level uniformity, respectively, and s1+ s2=1;
c2, extracting the volume and pressure values of the gas relay from the internal information corresponding to the target transformer conservator, and utilizing a calculation formula
Calculating to obtain the gas relay fault evaluation coefficient corresponding to the target transformer conservator
Wherein, U' 1 、U′ 2 Respectively expressed as a standard volume, a standard pressure value, delta U, corresponding to the gas relay in the target transformer 1 、ΔU 2 Expressed as the preset allowable volume difference and allowable pressure difference of the gas relay, U 1 Expressed as the corresponding volume, U, of the gas relay in the target transformer 2 Expressed as the pressure value corresponding to the gas relay in the target transformer, and f1 and f2 are respectively expressed as the volume of the set gas relay and the weight corresponding to the pressure valueFactor, and f1+ f2=1;
c3, based on the air bag fault evaluation coefficient and the gas relay fault evaluation coefficient corresponding to the target transformer oil conservator, utilizing a calculation formula
And calculating to obtain an internal fault evaluation coefficient gamma corresponding to the target transformer conservator, wherein g1 and g2 are respectively expressed as weight factors corresponding to the set air bag fault and the gas relay fault, and g1+ g2=1.
According to a preferred embodiment, in the sixth step, deep diagnosis is performed on the internal fault evaluation coefficient corresponding to the target transformer conservator, and the specific diagnosis process is as follows:
and comparing the internal fault evaluation coefficient corresponding to the target transformer conservator with the set internal fault evaluation coefficient of the transformer conservator, and if the internal fault evaluation coefficient corresponding to the target transformer conservator is greater than or equal to the set internal fault evaluation coefficient of the transformer conservator, judging that the transformer conservator is the internal fault conservator.
As described above, the transformer monitoring and fault diagnosis analysis method provided by the present invention has at least the following beneficial effects:
according to the transformer monitoring and fault diagnosis analysis method provided by the invention, the appearance information and the internal information of the target transformer conservator are analyzed, the appearance fault evaluation coefficient and the internal fault evaluation coefficient corresponding to the target transformer are respectively obtained through analysis, and fault diagnosis is respectively carried out, so that on one hand, the problem that limitation exists in the current transformer monitoring and fault diagnosis is effectively solved, the operation safety of the transformer is ensured, the damage to the transformer is avoided, the diagnosis workload of the transformer is reduced, the use efficiency and the service life of the transformer conservator are improved, the risk of transformer oil body leakage is reduced, on the other hand, the rationality and the scientificity of the transformer monitoring and diagnosis are improved, the degradation speed of oil is slowed down to a certain extent, the insulation strength of the transformer conservator is enhanced, meanwhile, the occurrence and the development of transformer conservator faults can be effectively prevented, on the other hand, the normal use of the transformer conservator in the follow-up process is ensured, certain potential safety hazards are avoided, and the accuracy and the referential of the fault diagnosis result of the transformer conservator are further ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart illustrating the steps of the method of the present invention.
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, a transformer monitoring and fault diagnosis analysis method includes the following steps:
step one, monitoring appearance information of a transformer conservator: the appearance information of the target transformer conservator is monitored through the distributed high-definition cameras, wherein the appearance information corresponding to the target transformer conservator comprises shell crack information, cable aging information and pipeline deformation information.
Preferably, the casing crack information of the transformer conservator targeted in the first step includes the number of casing cracks and the longest crack length, the cable aging information includes the number of cracks of each cable sheath, the longest crack length, the chromaticity of each cable sheath main body and the number of drops of each cable sheath, and the pipeline deformation information includes the pipeline distortion contour, the number of pipe breaks and the maximum damaged area.
Step two, analyzing the appearance fault of the transformer conservator: and analyzing the appearance information of the target transformer conservator to obtain an appearance fault evaluation coefficient corresponding to the target transformer conservator.
As a preferable scheme, in the second step, the appearance information of the target transformer conservator is analyzed, and the specific analysis process is as follows:
a1, obtaining shell crack information, and recording the longest crack length of the shell as L max ；
A2, obtaining cable aging information, and recording the longest crack length of each cable sheath as Q max i I denotes the number corresponding to each cable jacket, i =1,2, ·... M,;
a3, acquiring deformation information of the pipeline, and recording the maximum rupture area of the pipeline as S max Extracting the pipeline distortion contour from the pipeline information, performing coincidence comparison on the pipeline distortion contour and a preset standard pipeline contour, and utilizing a calculation formula
Calculating the distortion degree of the pipeline
V is expressed as the area of the overlapping pipeline profile, V' is expressed as the area of the set standard pipeline profile, V 1 Expressing the degree of the superposition as a set reference degree of the superposition, and further extracting the degree of the distortion of the pipeline from the superposition;
and A4, analyzing the appearance fault of the target transformer oil conservator according to the longest crack length of the shell, the longest crack length of the cable sheath, the largest fracture area of the pipeline and the distortion degree of the pipeline.
As a preferred scheme, the analyzing the appearance fault of the target transformer conservator comprises the following steps:
b1, extracting the number of the shell cracks corresponding to the target transformer conservator and the longest shell crack length from the shell crack information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a shell fault evaluation coefficient alpha corresponding to the target transformer conservator, wherein L 1 Expressed as the number of cracks in the shell of the target transformer conservator, L' 1 L' is respectively expressed as the number of allowed housing cracks of the set transformer conservator and the allowed housing crack length, b1 and b2 are respectively expressed as the balance influence factors corresponding to the number of the set housing cracks and the housing crack length, and b1+ b2=1;
b2, extracting the number of cable sheath cracks, the longest crack length, the chromaticity and the number of falling parts corresponding to the target transformer conservator from the cable aging information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a cable fault evaluation coefficient beta corresponding to the target transformer conservator, wherein Q 1 i 、Q 2 i 、Q 3 i Respectively expressed as the number of i-th cable sheath cracks, the main body chromaticity and the number of falling parts, Q ' and Q ' of the target transformer conservator ' 1 、Q′ 2 、Q′ 3 Respectively representing the permitted cable sheath crack length, the permitted cable sheath crack number, the standard chromaticity and the permitted shedding number of the set transformer conservator, wherein a1, a2, a3 and a4 respectively represent balance influence factors corresponding to the set crack number, crack length, chromaticity and shedding number, a1+ a2+ a3+ a4=1, and iota represents a correction factor;
b3, extracting the pipeline distortion degree, the pipeline fracture number and the maximum fracture area corresponding to the target transformer conservator from the pipeline deformation information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a pipeline fault evaluation coefficient eta corresponding to the target transformer conservator, wherein S 1 、S 2 Respectively expressed as the pipe distortion degree and the number of pipe fracture parts, S 'of the target transformer conservator' 1 、S′ 2 S' respectively represents the permission of the set transformer conservatorThe number of bendable pipe degrees, the number of allowable pipe breakages, and the allowable pipe breakup area, Δ S represents a set reference bending angle difference, h1, h2, and h3 represent balance influence factors corresponding to the set number of pipe bends, the number of pipe breakups, and the pipe breakup area, respectively, and h1+ h2+ h3=1;
b4, based on the shell fault evaluation coefficient, the cable fault evaluation coefficient and the pipeline fault evaluation coefficient corresponding to the target transformer conservator, calculating formulas are utilized
And calculating to obtain an appearance fault evaluation coefficient χ corresponding to the target transformer conservator, wherein c1, c2 and c3 are respectively expressed as weight factors corresponding to the set target transformer conservator shell fault, cable fault and pipeline fault, and c1+ c2+ c3=1.
Step three, primarily diagnosing faults of the transformer conservator: and performing preliminary diagnosis on the appearance fault evaluation coefficient corresponding to the target transformer conservator, if the target transformer conservator is the appearance fault conservator, executing the seventh step, and if the target transformer conservator is the appearance normal conservator, executing the fourth step.
As a preferable scheme, in the third step, the appearance fault evaluation coefficient corresponding to the target transformer conservator is preliminarily diagnosed, and the specific diagnosis process is as follows:
and comparing the appearance fault evaluation coefficient corresponding to the target transformer conservator with the set transformer conservator appearance fault evaluation coefficient, if the appearance fault evaluation coefficient corresponding to the target transformer conservator is greater than or equal to the set transformer conservator appearance fault evaluation coefficient, judging that the transformer conservator is an appearance fault conservator, and if the appearance fault evaluation coefficient corresponding to the target transformer conservator is less than the set transformer conservator appearance fault evaluation coefficient, judging that the transformer conservator is a normal-appearance conservator.
Monitoring the internal information of the transformer conservator: monitoring internal information corresponding to the target transformer conservator, wherein the internal information corresponding to the target transformer conservator comprises conservator airbag information and gas relay information.
As a preferred scheme, the step four includes monitoring internal information corresponding to the target transformer conservator, and the specific monitoring process includes:
repeatedly filling the same volume of gas into the target transformer conservator air bag for multiple times, and monitoring the oil level height of each filled gas to obtain the corresponding oil level height of each filled gas;
starting a motor to operate, detecting the volume of the gas relay, pressurizing the gas relay through a pressurizing pump to a set value, setting a pressure monitoring time point when the gas relay is pressurized to the set value, and monitoring the internal pressure value of the gas relay when the gas relay reaches the pressure monitoring time point;
and taking the oil level height of the target transformer conservator air bag, the volume capacity of the gas relay and the internal pressure value as the internal information corresponding to the target transformer conservator.
In one embodiment, before monitoring the volume of the buchholz relay, the method further comprises the steps of operating a motor, turning off one electromagnetic valve, keeping the motor rotating so that the transformer oil fills the oil cavity of the buchholz relay, turning off the electromagnetic valve at the other end, and simultaneously opening the volume valve so that the transformer oil flows into the volume barrel, thereby monitoring the volume of the buchholz relay.
In a specific embodiment, before monitoring the pressure value, the method further comprises the steps of starting the motor until the motor runs at a certain speed, closing the electromagnetic valve at one end until the oil in the oil cavity of the gas relay is full of oil, then closing the electromagnetic valve at the other end, pressurizing by the pressurizing pump, stopping pressurizing by the pressurizing pump when the pressure reaches a set pressure value, and monitoring the pressure value.
In a specific embodiment, the set pressure monitoring time point is any value of 10 minutes, 20 minutes, or 30 minutes.
Step five, analyzing the internal fault of the transformer conservator: and analyzing the internal information of the target transformer conservator to obtain an internal fault evaluation coefficient corresponding to the target transformer conservator.
As a preferred scheme, in the fifth step, the internal fault evaluation coefficient corresponding to the target transformer conservator is calculated in the following specific process:
c1, extracting the oil level height of the air bag from the internal information corresponding to the target transformer conservator, further screening to obtain the highest oil level height and the lowest oil level height, meanwhile, calculating by using a mean value to obtain an average oil level height, and using a calculation formula
Calculating to obtain an air bag fault evaluation coefficient delta corresponding to the target transformer conservator, wherein j represents a number corresponding to each gas filling frequency, and j =1,2 1 Expressed as a set initial oil level, W, of the air bag 1 j Expressed as the height of the oil level of the air bag corresponding to the j-th filling of the same volume of gas, W 0 Expressed as a difference in the height of the air bag-permitted oil level set, e is expressed as a natural constant, W max Expressed as the maximum oil level, W min Expressed as the height of the lowest oil level,
expressed as an average oil level height, W' as a set oil level uniformity, s1 and s2 as weight factors corresponding to the oil level height and the oil level uniformity, respectively, and s1+ s2=1;
c2, extracting the volume and pressure values of the gas relay from the internal information corresponding to the target transformer conservator, and utilizing a calculation formula
Calculating to obtain the gas relay fault evaluation coefficient corresponding to the target transformer conservator
Wherein, U' 1 、U′ 2 Respectively expressed as a standard volume, a standard pressure value, delta U, corresponding to the gas relay in the target transformer 1 、ΔU 2 Expressed as the preset allowable volume difference and allowable pressure difference of the gas relay, U 1 Expressed as the corresponding volume, U, of the gas relay in the target transformer 2 Expressing the pressure value corresponding to the gas relay in the target transformer, wherein f1 and f2 are respectively expressed as weight factors corresponding to the volume quantity and the pressure value of the set gas relay, and f1+ f2=1;
c3, based on the air bag fault evaluation coefficient and the gas relay fault evaluation coefficient corresponding to the target transformer oil conservator, utilizing a calculation formula
And calculating to obtain an internal fault evaluation coefficient gamma corresponding to the target transformer conservator, wherein g1 and g2 are respectively expressed as weight factors corresponding to the set air bag fault and the gas relay fault, and g1+ g2=1.
Step six, diagnosing the fault depth of the transformer conservator: and carrying out deep diagnosis on the internal fault evaluation coefficient corresponding to the target transformer conservator, and if the target transformer conservator is the internal fault conservator, executing the step seven.
As a preferable scheme, the deep diagnosis is performed on the internal fault evaluation coefficient corresponding to the target transformer conservator in the sixth step, and the specific diagnosis process is as follows:
and comparing the internal fault evaluation coefficient corresponding to the target transformer conservator with the set internal fault evaluation coefficient of the transformer conservator, and if the internal fault evaluation coefficient corresponding to the target transformer conservator is greater than or equal to the set internal fault evaluation coefficient of the transformer conservator, judging that the transformer conservator is the internal fault conservator.
Seventhly, early warning display terminal: and carrying out early warning display on the appearance fault or the internal fault corresponding to the target transformer conservator.
According to the transformer monitoring and fault diagnosis analysis method provided by the embodiment of the invention, the appearance information and the internal information of the target transformer conservator are analyzed, the appearance fault evaluation coefficient and the internal fault evaluation coefficient corresponding to the target transformer are respectively obtained through analysis, and fault diagnosis is respectively carried out, so that on one hand, the problem that limitation exists in the current transformer monitoring and fault diagnosis is effectively solved, the operation safety of the transformer is ensured, the damage to the transformer is avoided, the diagnosis workload of the transformer is reduced, the use efficiency and the service life of the transformer conservator are improved, the risk of transformer oil body leakage is reduced, on the other hand, the rationality and the scientificity of the transformer monitoring and diagnosis are improved, the degradation speed of oil is slowed down to a certain extent, the insulation strength of the transformer conservator is enhanced, the occurrence and the development of transformer conservator faults can be effectively prevented, on the other hand, the normal use of the transformer conservator in the follow-up process is ensured, a certain potential safety hazard is avoided, and the accuracy and the reference of fault diagnosis results of the transformer conservator are further ensured.
The foregoing is illustrative and explanatory only of the present invention, and it is intended that the present invention cover modifications, additions, or substitutions by those skilled in the art, without departing from the spirit of the invention or exceeding the scope of the claims.
Claims (8)
1. A transformer monitoring and fault diagnosis analysis method is characterized in that: the method comprises the following steps:
step one, monitoring appearance information of a transformer conservator: monitoring appearance information of a target transformer conservator through a distributed high-definition camera, wherein the appearance information corresponding to the target transformer conservator comprises shell crack information, cable aging information and pipeline deformation information;
step two, analyzing the appearance fault of the transformer conservator: analyzing the appearance information of the target transformer conservator to obtain an appearance fault evaluation coefficient corresponding to the target transformer conservator;
step three, primarily diagnosing faults of the transformer conservator: performing preliminary diagnosis on an appearance fault evaluation coefficient corresponding to the target transformer conservator, if the target transformer conservator is an appearance fault conservator, executing a seventh step, and if the target transformer conservator is a normal appearance conservator, executing a fourth step;
step four, monitoring the internal information of the transformer conservator: monitoring internal information corresponding to a target transformer conservator, wherein the internal information corresponding to the target transformer conservator comprises conservator airbag information and gas relay information;
step five, analyzing the internal fault of the transformer conservator: analyzing the internal information of the target transformer conservator to obtain an internal fault evaluation coefficient corresponding to the target transformer conservator;
step six, diagnosing the fault depth of the transformer oil conservator: deep diagnosis is carried out on the internal fault evaluation coefficient corresponding to the target transformer conservator, and if the target transformer conservator is the internal fault conservator, the seventh step is executed;
seventhly, early warning display terminal: and carrying out early warning display on the appearance fault or the internal fault corresponding to the target transformer conservator.
2. The transformer monitoring and fault diagnosis analysis method according to claim 1, characterized in that: the shell crack information of the target transformer conservator in the first step comprises the number of shell cracks and the longest crack length, the cable aging information comprises the number of the cracks of each cable sheath, the longest crack length, the main chromaticity of each cable sheath and the number of the falling parts of each cable sheath, and the pipeline deformation information comprises a pipeline distortion contour, the number of the broken parts of the pipeline and the maximum damaged area.
3. The transformer monitoring and fault diagnosis analysis method according to claim 2, characterized in that: and analyzing the appearance information of the target transformer conservator in the step two, wherein the specific analysis process is as follows:
a1, obtaining shell crack information, and recording the longest crack length of the shell as L max ；
A2, obtaining cable aging information, and recording the longest crack length of each cable sheath as Q max i I denotes the number corresponding to each cable jacket, i =1,2, ·... M,;
a3, acquiring deformation information of the pipeline, and recording the maximum rupture area of the pipeline as S max Extracting the pipeline distortion contour from the pipeline information, superposing and comparing the pipeline distortion contour with a preset standard pipeline contour, and measuring by using a meterFormula of calculation
Calculating the distortion degree of the pipeline
V is expressed as the area of the overlapping pipeline profile, V' is expressed as the area of the set standard pipeline profile, V 1 Expressing the degree of the superposition as a set reference degree of the superposition, and further extracting the degree of the distortion of the pipeline from the superposition;
and A4, analyzing the appearance fault of the target transformer conservator according to the longest crack length of the shell, the longest crack length of the cable sheath, the largest fracture area of the pipeline and the distortion degree of the pipeline.
4. The transformer monitoring and fault diagnosis analysis method according to claim 3, characterized in that: the method for analyzing the appearance fault of the target transformer conservator comprises the following steps:
b1, extracting the number of shell cracks and the longest shell crack length corresponding to the target transformer conservator from the shell crack information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a shell fault evaluation coefficient alpha corresponding to the target transformer conservator, wherein L 1 Expressed as the number of cracks in the shell of the target transformer conservator, L' 1 L' respectively represents the allowed number of the cracks of the transformer oil conservator and the allowed length of the cracks of the transformer oil conservator, b1 and b2 respectively represent balance influence factors corresponding to the set number of the cracks of the transformer oil conservator and the set length of the cracks of the transformer oil conservator, and b1+ b2=1;
b2, extracting the number of cable sheath cracks, the longest crack length, the chromaticity and the number of falling parts corresponding to the target transformer conservator from the cable aging information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a cable fault evaluation coefficient beta corresponding to the target transformer conservator, wherein Q 1 i 、Q 2 i 、Q 3 i Respectively expressed as the number of i-th cable sheath cracks, the main body chromaticity and the number of falling parts, Q ' and Q ' of the target transformer conservator ' 1 、Q′ 2 、Q′ 3 Respectively representing the permitted cable sheath crack length, the permitted cable sheath crack number, the standard chromaticity and the permitted shedding number of the set transformer conservator, wherein a1, a2, a3 and a4 respectively represent balance influence factors corresponding to the set crack number, crack length, chromaticity and shedding number, a1+ a2+ a3+ a4=1, and iota represents a correction factor;
b3, extracting the pipeline distortion degree, the pipeline fracture number and the maximum fracture area corresponding to the target transformer conservator from the pipeline deformation information of the target transformer conservator, and utilizing a calculation formula
Calculating to obtain a pipeline fault evaluation coefficient eta corresponding to the target transformer conservator, wherein S 1 、S 2 Respectively expressed as the pipe distortion degree and the number of pipe fracture parts, S 'of the target transformer conservator' 1 、S′ 2 S' represents an allowable pipe bending degree, an allowable pipe breakage number, and an allowable pipe breakage area of the set transformer conservator, respectively, Δ S represents a set reference bending angle difference, h1, h2, and h3 represent balance influence factors corresponding to the set pipe bending degree, the pipe breakage number, and the pipe breakage area, respectively, and h1+ h2+ h3=1;
b4, based on the shell fault evaluation coefficient, the cable fault evaluation coefficient and the pipeline fault evaluation coefficient corresponding to the target transformer conservator, calculating formulas are utilized
And calculating to obtain an appearance fault evaluation coefficient chi corresponding to the target transformer conservator, wherein c1, c2 and c3 are respectively expressed as set target variablesThe transformer conservator shell fault, cable fault and pipeline fault correspond to weighting factors, and c1+ c2+ c3=1.
5. The transformer monitoring and fault diagnosis analysis method according to claim 4, characterized in that: and in the third step, the appearance fault evaluation coefficient corresponding to the target transformer conservator is preliminarily diagnosed, and the specific diagnosis process is as follows:
and comparing the appearance fault evaluation coefficient corresponding to the target transformer conservator with the set transformer conservator appearance fault evaluation coefficient, if the appearance fault evaluation coefficient corresponding to the target transformer conservator is greater than or equal to the set transformer conservator appearance fault evaluation coefficient, judging that the transformer conservator is an appearance fault conservator, and if the appearance fault evaluation coefficient corresponding to the target transformer conservator is less than the set transformer conservator appearance fault evaluation coefficient, judging that the transformer conservator is a normal-appearance conservator.
6. The transformer monitoring and fault diagnosis analysis method according to claim 1, characterized in that: monitoring the internal information corresponding to the target transformer conservator in the fourth step, wherein the specific monitoring process is as follows:
repeatedly filling the same volume of gas into the target transformer conservator air bag for multiple times, and monitoring the oil level height of each filled gas to obtain the corresponding oil level height of each filled gas;
starting a motor to operate, detecting the volume of the gas relay, pressurizing the gas relay through a pressurizing pump to a set value, setting a pressure monitoring time point when the gas relay is pressurized to the set value, and monitoring the internal pressure value of the gas relay when the gas relay reaches the pressure monitoring time point;
and taking the oil level height of the target transformer conservator air bag, the volume capacity of the gas relay and the internal pressure value as the internal information corresponding to the target transformer conservator.
7. The transformer monitoring and fault diagnosis analysis method according to claim 6, characterized in that: and the internal fault evaluation coefficient corresponding to the target transformer conservator in the step five is calculated in the following specific process:
c1, extracting the oil level height of the air bag from the internal information corresponding to the target transformer conservator, further screening to obtain the highest oil level height and the lowest oil level height, meanwhile, calculating by using a mean value to obtain an average oil level height, and using a calculation formula
Calculating to obtain an air bag fault evaluation coefficient delta corresponding to the target transformer conservator, wherein j represents a number corresponding to each gas injection frequency, and j =1,2 1 Expressed as a set bladder initial oil level height, W 1 j Expressed as the height of the oil level of the air bag corresponding to the j-th filling of the same volume of gas, W 0 Expressed as a difference in the height of the air bag-permitted oil level set, e is expressed as a natural constant, W max Expressed as the maximum oil level, W min Expressed as the height of the lowest oil level,
expressed as an average oil level height, W' as a set oil level uniformity, s1 and s2 as weight factors corresponding to the oil level height and the oil level uniformity, respectively, and s1+ s2=1;
c2, extracting the volume and pressure values of the gas relay from the internal information corresponding to the target transformer conservator, and utilizing a calculation formula
Calculating to obtain the gas relay fault evaluation coefficient corresponding to the target transformer conservator
Wherein, U' 1 、U′ 2 Respectively expressed as a standard volume, a standard pressure value, delta U, corresponding to the gas relay in the target transformer 1 、ΔU 2 The allowable volume difference and the allowance of the gas relay are expressed as presetPressure difference, U 1 Expressed as the corresponding volume, U, of the gas relay in the target transformer 2 Expressing the pressure value corresponding to the gas relay in the target transformer, wherein f1 and f2 are respectively expressed as weight factors corresponding to the volume quantity and the pressure value of the set gas relay, and f1+ f2=1;
c3, based on the air bag fault evaluation coefficient and the gas relay fault evaluation coefficient corresponding to the target transformer oil conservator, utilizing a calculation formula
And calculating to obtain an internal fault evaluation coefficient gamma corresponding to the target transformer conservator, wherein g1 and g2 are respectively expressed as weight factors corresponding to the set air bag fault and the set gas relay fault, and g1+ g2=1.
8. The transformer monitoring and fault diagnosis analysis method according to claim 7, characterized in that: in the sixth step, deep diagnosis is performed on the internal fault evaluation coefficient corresponding to the target transformer conservator, and the specific diagnosis process is as follows:
and comparing the internal fault evaluation coefficient corresponding to the target transformer conservator with the set internal fault evaluation coefficient of the transformer conservator, and if the internal fault evaluation coefficient corresponding to the target transformer conservator is greater than or equal to the set internal fault evaluation coefficient of the transformer conservator, judging that the transformer conservator is the internal fault conservator.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148657A (en) * | 2023-04-21 | 2023-05-23 | 浙江威利坚科技股份有限公司 | Electromagnetic leakage circuit breaker operation monitoring and diagnosing method |
| CN117074824A (en) * | 2023-08-17 | 2023-11-17 | 东莞市港龙电源设备有限公司 | Inspection system and method for transformer protection system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148657A (en) * | 2023-04-21 | 2023-05-23 | 浙江威利坚科技股份有限公司 | Electromagnetic leakage circuit breaker operation monitoring and diagnosing method |
| CN116148657B (en) * | 2023-04-21 | 2023-07-07 | 浙江威利坚科技股份有限公司 | Electromagnetic leakage circuit breaker operation monitoring and diagnosing method |
| CN117074824A (en) * | 2023-08-17 | 2023-11-17 | 东莞市港龙电源设备有限公司 | Inspection system and method for transformer protection system |
| CN117074824B (en) * | 2023-08-17 | 2024-03-22 | 东莞市港龙电源设备有限公司 | Inspection system and method for transformer protection system |
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