CN115327318A - Aging detection method and system for natural ester insulating oil transformer insulating system - Google Patents
Aging detection method and system for natural ester insulating oil transformer insulating system Download PDFInfo
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- CN115327318A CN115327318A CN202210978755.3A CN202210978755A CN115327318A CN 115327318 A CN115327318 A CN 115327318A CN 202210978755 A CN202210978755 A CN 202210978755A CN 115327318 A CN115327318 A CN 115327318A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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Abstract
The invention relates to the technical field of transformers, and discloses an aging detection method and system for an insulation system of a natural ester insulation oil transformer, which comprises the steps of collecting oil temperature data, micro-water content and chromaticity data of insulation oil in the insulation system of the natural ester insulation oil transformer; carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain aging degree data of the insulation paper; carrying out aging analysis on the insulating oil according to the chromaticity data to obtain aging degree data of the insulating oil; and analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result. The aging degree of the transformer can be simply and efficiently detected, and the safety and the stability of the operation of the transformer are improved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to an aging detection method and system for an insulation system of a natural ester insulation oil transformer.
Background
At present, in a power grid system in China, a plurality of power transformers with the running life close to or exceeding the period exist, and due to the consideration of factors such as cost, the power transformers are still in working operation at present, so that one problem is that the electrical performance and the mechanical performance of an insulating material are gradually reduced along with the aggravation of the insulation aging degree of the transformer, the insulation performance and the short-circuit resistance of the transformer are greatly reduced, and the safety and the reliability of the operation of the transformer are influenced. Although the natural ester insulating oil transformer is not applied for a long time at present, the natural ester insulating oil transformer is gradually popularized and used along with the establishment of double-carbon targets in China, so the aging of the natural ester insulating oil transformer needs to be researched, the aging of the liquid-immersed transformer is mainly caused by the aging of insulating oil and insulating paper in the transformer, the aging degree of the insulating paper is difficult to detect, the detection period is long, and therefore, the cost is high and the detection efficiency is low when the insulating paper is used for deducing the aging degree of the transformer.
Disclosure of Invention
In order to solve the technical problems, the invention provides an aging detection method and system for an insulation system of a natural ester insulation oil transformer, which can solve the problems of high detection difficulty and long detection period, and can perform online analysis on the aging degree of the insulation system of the natural ester insulation oil transformer to achieve the effect of monitoring the aging of the insulation system in real time.
In a first aspect, the present invention provides a method for aging detection of an insulation system of a natural ester insulating oil transformer, the method comprising:
collecting oil temperature data, micro-water content and chromaticity data of insulating oil in an insulating system of a natural ester insulating oil transformer;
carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain aging degree data of the insulation paper;
carrying out aging analysis on the insulating oil according to the chromaticity data to obtain aging degree data of the insulating oil;
and analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result.
Further, the step of performing aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content comprises the following steps:
according to the oil temperature data, obtaining a corresponding water content threshold value, and calculating a difference value between the micro-water content and the water content threshold value;
and obtaining the aging degree data of the insulation paper in the insulation system of the natural ester insulation oil transformer according to the difference value.
Further, the step of obtaining the corresponding water cut threshold value according to the oil temperature data includes:
acquiring an equilibrium state curve of micro-water content between insulating oil and insulating paper in the insulating system of the natural ester insulating oil transformer at a given temperature;
and obtaining a water containing threshold corresponding to the oil temperature data according to the equilibrium state curve.
Further, the step of performing aging analysis on the insulating oil according to the chromaticity data includes:
obtaining corresponding dielectric loss data according to the chrominance data;
and obtaining the aging degree data of the insulating oil according to the dielectric loss data.
Further, the step of obtaining corresponding dielectric loss data according to the chrominance data includes:
obtaining a relation curve between the chromaticity of the insulating oil and the dielectric damage in the insulating system of the natural ester insulating oil transformer;
and obtaining dielectric loss data corresponding to the chrominance data according to the relation curve.
Further, the method further comprises:
and comparing the aging analysis result of the insulation system of the natural ester insulation oil transformer with an aging threshold value, and if the aging threshold value is reached, giving an aging alarm.
In a second aspect, the present invention provides an aging detection system for an insulation system of a natural ester insulation oil transformer, including the natural ester insulation oil transformer, the aging detection system further including:
the data acquisition module and the aging analysis module are sequentially connected with the natural ester insulating oil transformer;
the data acquisition module is used for acquiring oil temperature data, micro-water content and chromaticity data of insulating oil in the insulating system of the natural ester insulating oil transformer;
the aging analysis module is used for carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain aging degree data of the insulation paper; carrying out aging analysis on the insulating oil according to the chromaticity data to obtain aging degree data of the insulating oil; and analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result.
Furthermore, the data acquisition module is connected with a pipe joint on an oil tank of the natural ester insulating oil transformer through a connecting pipe and a valve, and the data acquisition module is connected with the aging analysis module through a data transmission line.
Further, the data acquisition module comprises: an oil temperature sensor, a micro-water sensor and a light splitting detector.
Further, the aging analysis module further comprises:
and the aging early warning module is used for comparing an aging analysis result of the insulation system of the natural ester insulation oil transformer with an aging threshold value, and if the aging analysis result reaches the aging threshold value, an aging alarm is sent out.
The invention provides an aging detection method and system for an insulation system of a natural ester insulation oil transformer. By the method, the aging degree of the insulating system of the natural ester insulating oil transformer is analyzed on line by using the effective data of oil temperature, micro water in oil and chromaticity value, so that the aging degree of the insulating system is monitored in real time, the aging detection efficiency and accuracy of the transformer are improved, and the running safety and stability of the transformer are enhanced.
Drawings
FIG. 1 is a schematic flow diagram of a method for aging detection of an insulation system of a natural ester insulation oil transformer according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of step S20 in FIG. 1;
FIG. 3 is a schematic flow chart of step S30 in FIG. 1;
FIG. 4 is a plot of color versus dielectric loss data for a rapeseed-based natural ester insulating oil in accordance with an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an aging detection system for a natural ester insulating oil transformer insulation system according to an embodiment of the present invention;
fig. 6 is a schematic structural connection diagram of an aging detection system for an insulation system of a natural ester insulating oil transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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 method for detecting aging of an insulation system of a transformer using natural ester insulation oil according to a first embodiment of the present invention includes steps S10 to S40:
and S10, acquiring oil temperature data, micro-water content and chromaticity data of insulating oil in an insulating system of the natural ester insulating oil transformer.
The invention provides a method for deducing the aging degree of a transformer by analyzing insulating oil to improve the detection efficiency and reduce the detection cost.
In the insulating oil analysis process, the relevant data of the insulating oil used in the embodiment of the invention comprises oil temperature data, micro water content and chromaticity data, wherein the oil temperature data of the insulating oil can be acquired by an oil temperature sensor, the micro water content of the insulating oil can be acquired by a micro water sensor, and the chromaticity data of the insulating oil can be acquired by an optical analyzer, and the data can be acquired by conventional sensors or equipment, which is not described in detail herein.
And S20, carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain the aging degree data of the insulation paper.
Because the aging detection of the insulating paper is directly difficult, the embodiment of the invention deduces the aging degree of the insulating paper by using the data of the insulating oil, and therefore, the correlation between the aging degrees of the insulating oil and the insulating paper needs to be confirmed.
In fact, as the temperature of the oil increases, the capacity of the insulating oil of the liquid-immersed transformer to contain water in the oil also increases significantly, and therefore, the detection of the water content in the oil is based on data at a certain temperature. The micro water in the transformer is mainly dissolved in the insulating oil and the cellulose insulating paper, and when the temperature is kept for a certain time, the micro water content between the insulating oil and the insulating paper can reach an equilibrium state. And, as the degree of aging of the insulating paper is higher, the more the molecular bonding bonds of the insulating paper are broken and the moisture-holding ability is lowered, and therefore, the higher the degree of aging of the insulating paper is, the greater the water content in the insulating oil is for the same water content in the paper. Based on the above-mentioned relationship between the insulating oil and the insulating paper, the procedure of the insulating paper aging analysis shown in fig. 2 can be obtained:
step S201, obtaining a corresponding water-containing threshold value according to the oil temperature data, and calculating a difference value between the micro-water content and the water-containing threshold value.
And S202, obtaining the aging degree data of the insulation paper in the insulation system of the natural ester insulation oil transformer according to the difference value.
Firstly, according to the relation between the insulating oil and the insulating paper in the transformer, an equilibrium state curve of the micro-water content between the insulating oil and the insulating paper at a given temperature can be obtained, the micro-water content in an equilibrium state at different oil temperatures can be obtained through the equilibrium state curve, the micro-water content in the equilibrium state is taken as a water content threshold value, and then the difference value between the acquired micro-water content and the water content threshold value is calculated. It is obvious that the larger the difference is, the larger the moisture content in the insulating oil is, that is, the higher the degree of aging of the insulating paper is, and the degree of aging of the insulating paper can be detected simply and efficiently by this method.
And S30, carrying out aging analysis on the insulating oil according to the chromaticity data to obtain the aging degree of the insulating oil.
After the aging degree of the insulating paper is obtained, the aging degree of the insulating oil needs to be analyzed, and the natural ester insulating oil is gradually applied to oil-immersed electrical equipment such as transformers, cables and capacitors along with the gradual improvement of environmental protection requirements. However, when the natural ester insulating oil is applied to electrical equipment, the natural ester insulating oil has the characteristics of easy moisture absorption based on the physical and chemical properties of the natural ester insulating oil, and impurities are dissolved into the oil after the electrical equipment is put into operation. In particular, when impurities or moisture intrude into the natural ester insulating oil, dielectric loss of the insulating oil is increased, which also becomes an important index for judging whether the natural ester insulating oil is aged. However, since dielectric loss measurement of the natural ester insulating oil is easily affected by the environment and facilities, it is necessary to clean the vessel containing the natural ester insulating oil sufficiently, and it is necessary to perform dielectric loss measurement of the natural ester insulating oil at 80 or 90 degrees, which requires a long time for heating the natural ester insulating oil.
Based on the reasons, the method for judging the dielectric loss of the insulating oil by detecting the chromaticity of the natural ester insulating oil and then judging the aging degree of the insulating oil is adopted, and compared with the method for directly measuring the dielectric loss of the insulating oil, the method provided by the invention can improve the judging efficiency. The steps are shown in figure 3:
and S301, obtaining corresponding dielectric loss data according to the chrominance data.
And S302, obtaining the aging degree data of the insulating oil according to the dielectric loss data.
According to the method, firstly, a chromaticity reference value APHA of the Natural Ester Insulating oil when the Natural Ester Insulating oil leaves a factory is detected, then in the production, operation and Maintenance processes of the Natural Ester Insulating oil, the aging degree of the Natural Ester Insulating oil 2 is judged by detecting the chromaticity of the Natural Ester Insulating oil, actually, the chromaticity deviation of each oil-based Natural Ester Insulating oil during aging is different, and the dielectric loss of the unused Natural Ester Insulating oil is not more than 4% specified in IEEE Guide for Acceptance and Maintenance of Natural Ester Insulating oil, so that a relation curve between the chromaticity of the Insulating oil with different oil bases and medium damage data can be obtained in advance, for example, the relation curve between the chromaticity of certain rapeseed-based Natural Ester Insulating oil and the dielectric loss data shown in figure 4, and the dielectric loss of the Insulating oil can be deduced simply and conveniently according to the collected chromaticity data through the relation curve.
That is, we have obtained a correlation between APHA of the natural ester insulating oil and dielectric loss as an index of aging of the natural ester insulating oil, and specifically, the larger APHA of the natural ester insulating oil, the higher the dielectric loss value of the natural ester insulating oil, and the method of the present invention for estimating the degree of aging of the insulating oil using the chromaticity data is not only simple but also efficient.
And S40, analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result.
The method comprises the steps of firstly evaluating the aging state of the insulating paper at a given temperature according to a balance state curve of micro-water content between the insulating oil and the insulating paper, then evaluating the aging state of the insulating oil by a colorimetric detection method, and finally calculating the aging degree of the insulating system of the transformer by combining the aging data of the insulating paper and the insulating oil.
And S50, comparing the aging degree of the insulation system of the natural ester insulation oil transformer with an aging threshold, and if the aging degree reaches the aging threshold, giving an aging alarm.
In order to further improve the safety of the transformer, the invention also provides an early warning function, namely when the detected aging degree reaches or exceeds a preset early warning value, an alarm is immediately sent out to prompt related personnel to maintain the transformer in time, for example, the transformer is treated in a degassing oil filtering or oil changing mode, so that the safety and the stability of the operation of the transformer are further improved.
Compared with the traditional method for detecting the aging of the insulation system of the natural ester insulation oil transformer, the aging detection method for the insulation system of the natural ester insulation oil transformer has the advantages that the aging detection difficulty of insulation paper is high, the period is long, and the insulation oil dielectric loss detection step is complex.
Referring to fig. 5, based on the same inventive concept, a second embodiment of the present invention provides an aging detection system for an insulation system of a natural ester insulation oil transformer, including the natural ester insulation oil transformer, the aging detection system further includes:
the data acquisition module 10 and the aging analysis module 20 are sequentially connected with the natural ester insulating oil transformer;
the data acquisition module is used for acquiring oil temperature data, micro-water content and chromaticity data of insulating oil in the insulating system of the natural ester insulating oil transformer;
the aging analysis module is used for carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain aging degree data of the insulation paper; carrying out aging analysis on the insulating oil according to the chromaticity data to obtain aging degree data of the insulating oil; and analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result.
The specific connection relationship between the system modules of the present invention is illustrated by the connection schematic diagram of the aging detection system shown in fig. 6:
the natural ester insulating oil transformer 1 is internally stored with natural ester insulating oil 2, and a pipe joint 3 of an oil tank of the natural ester insulating oil transformer is connected with a valve 4 and a connecting pipe 5, so that the connection between the natural ester insulating oil transformer 1 and a data acquisition module 10 is realized, wherein the data acquisition module 10 comprises a micro water sensor 6, an oil temperature sensor 7 and an optical analyzer 8, and the data acquisition module 10 is connected with an aging analysis module 20 through a data transmission line 9.
Through the connection relation, the natural ester insulating oil 2 can enter the data acquisition module 10 through the pipe joint 3 and the connecting pipe 5 to realize data acquisition, wherein the valve 4 is in a normally open state, and data acquired by the data acquisition module 10 is transmitted to the aging analysis module 20 through the data transmission line 9 to perform aging analysis.
Further, the aging analysis module 20 further includes:
and the aging early warning module 204 is used for comparing an aging analysis result of the insulation system of the natural ester insulation oil transformer with an aging threshold value, and if the aging analysis result reaches the aging threshold value, sending an aging alarm.
The technical characteristics and technical effects of the aging detection system for the insulation system of the natural ester insulation oil transformer provided by the embodiment of the invention are the same as those of the method provided by the embodiment of the invention, and are not repeated herein. The above-described respective modules in the aging detection system for the insulation system of the natural ester insulating oil transformer may be wholly or partially implemented by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
To sum up, the aging detection method and system for the insulation system of the natural ester insulation oil transformer provided by the embodiment of the invention collect oil temperature data, micro-water content and chromaticity data of insulation oil in the insulation system of the natural ester insulation oil transformer; carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain the aging degree data of the insulation paper; carrying out aging analysis on the insulating oil according to the chromaticity data to obtain aging degree data of the insulating oil; and analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result. According to the invention, the aging degree of the insulation system of the natural ester insulation oil transformer is analyzed on line through effective data of oil temperature and micro water in oil and chromaticity values, the aging degree of the transformer can be simply and efficiently detected, and the running safety and stability of the transformer are improved.
The embodiments in the present specification are described in a progressive manner, and all the embodiments are directly referred to the same or similar parts, and each embodiment is mainly described as different from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment. It should be noted that, the technical features of the embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express some preferred embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these should be construed as the protection scope of the present application. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.
Claims (10)
1. A method for detecting aging of an insulation system of a natural ester insulating oil transformer is characterized by comprising the following steps:
collecting oil temperature data, micro-water content and chromaticity data of insulating oil in an insulating system of a natural ester insulating oil transformer;
carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain aging degree data of the insulation paper;
carrying out aging analysis on the insulating oil according to the chromaticity data to obtain aging degree data of the insulating oil;
and analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result.
2. The aging detection method for insulation system of natural ester insulation oil transformer according to claim 1, wherein the step of performing aging analysis of insulation paper in the insulation system of natural ester insulation oil transformer according to the oil temperature data and the micro water content comprises:
obtaining a corresponding water-containing threshold value according to the oil temperature data, and calculating a difference value between the micro-water content and the water-containing threshold value;
and obtaining the aging degree data of the insulation paper in the insulation system of the natural ester insulation oil transformer according to the difference.
3. The method of claim 2, wherein the step of deriving a corresponding moisture threshold from the oil temperature data comprises:
acquiring an equilibrium state curve of micro-water content between insulating oil and insulating paper in the insulating system of the natural ester insulating oil transformer at a given temperature;
and obtaining a water containing threshold corresponding to the oil temperature data according to the equilibrium state curve.
4. The aging detection method for a natural ester insulating oil transformer insulation system of claim 1, wherein the step of performing an aging analysis on the insulating oil according to the colorimetric data comprises:
obtaining corresponding dielectric loss data according to the chrominance data;
and obtaining the aging degree data of the insulating oil according to the dielectric loss data.
5. The aging detection method for the insulation system of the natural ester insulating oil transformer as claimed in claim 4, wherein the step of obtaining the corresponding dielectric loss data according to the chromaticity data comprises:
obtaining a relation curve between the chromaticity of the insulating oil and the dielectric damage in the insulating system of the natural ester insulating oil transformer;
and obtaining dielectric loss data corresponding to the chrominance data according to the relation curve.
6. The aging detection method for a natural ester insulating oil transformer insulation system of claim 1, further comprising:
and comparing the aging analysis result of the insulation system of the natural ester insulating oil transformer with an aging threshold value, and if the aging threshold value is reached, giving an aging alarm.
7. An aging detection system for a natural ester insulating oil transformer insulation system, comprising a natural ester insulating oil transformer, characterized in that the aging detection system further comprises:
the data acquisition module and the aging analysis module are sequentially connected with the natural ester insulating oil transformer;
the data acquisition module is used for acquiring oil temperature data, micro-water content and chromaticity data of insulating oil in the insulating system of the natural ester insulating oil transformer;
the aging analysis module is used for carrying out aging analysis on the insulation paper in the insulation system of the natural ester insulation oil transformer according to the oil temperature data and the micro-water content to obtain aging degree data of the insulation paper; carrying out aging analysis on the insulating oil according to the chromaticity data to obtain aging degree data of the insulating oil; and analyzing the aging degree of the insulation system of the natural ester insulation oil transformer according to the aging degree data of the insulation paper and the aging degree data of the insulation oil to obtain an aging analysis result.
8. The degradation detection system for the insulation system of the natural ester insulating oil transformer of claim 7, wherein the data collection module is connected with a pipe joint on a tank of the natural ester insulating oil transformer through a pipe and a valve, and the data collection module is connected with the degradation analysis module through a data transmission line.
9. The aging detection system for a natural ester insulating oil transformer insulation system of claim 7, wherein the data acquisition module comprises: an oil temperature sensor, a micro-water sensor and a light splitting detector.
10. The aging detection system for a natural ester insulating oil transformer insulation system of claim 9, wherein the aging analysis module further comprises:
and the aging early warning module is used for comparing the aging analysis result of the insulation system of the natural ester insulation oil transformer with an aging threshold value, and if the aging analysis result reaches the aging threshold value, an aging alarm is sent out.
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| CN116773987A (en) * | 2023-08-24 | 2023-09-19 | 北京中联太信科技有限公司 | Insulation level monitoring's on-line control system |
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| CN116773987A (en) * | 2023-08-24 | 2023-09-19 | 北京中联太信科技有限公司 | Insulation level monitoring's on-line control system |
| CN116773987B (en) * | 2023-08-24 | 2023-10-31 | 北京中联太信科技有限公司 | Insulation level monitoring's on-line control system |
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