CN115902534A - Aging detection method and system for insulating silicone oil and electronic equipment - Google Patents
Aging detection method and system for insulating silicone oil and electronic equipment Download PDFInfo
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Abstract
The application discloses a method and a system for detecting aging of insulating silicone oil and electronic equipment, wherein the detection method comprises the following steps: sampling insulating silicone oil, and drying to obtain a silicone oil sample; constructing a voltage regulation test loop, placing the dried silicone oil sample in a constant temperature and humidity environment, then connecting the dried silicone oil sample into the loop, adjusting the test voltage to enable the silicone oil to generate discharge under uneven field intensity, and then maintaining the voltage to continuously perform electric heating and humidity combined aging treatment on the silicone oil sample; then, a quantitative silicone oil sample is periodically obtained, multi-dimensional parameter testing is carried out on the silicone oil sample, the electric physical and chemical performance parameters of the silicone oil sample are obtained, and the change rule of the electric physical and chemical performance parameters along with the aging duration is analyzed; and finally, comprehensively evaluating the insulation aging degree of the silicone oil by combining the multi-dimensional electrical physical and chemical performance parameter test result to obtain the aging state information of the silicone oil. The application discloses a detection method which can carry out multi-dimensional detection on silicone oil aging, scientifically evaluate the aging state of the silicone oil in a cable terminal and realize efficient production and safe operation and maintenance of the terminal.
Description
Technical Field
The application relates to the technical field of aging state detection of insulating silicone oil, in particular to an aging detection method and system of insulating silicone oil and electronic equipment.
Background
In recent years, the development of the power transformation industry in China is rapid, and power cables are widely applied as important electrical equipment in urban power grids, wherein the oil terminal taking silicone oil as a liquid insulating medium always occupies a large proportion in the high-voltage cable terminal by means of mature production process and operation experience of the oil terminal. In normal use and operation of electrical equipment, due to the action of various factors such as an electric field, a magnetic field, temperature and the like, the insulating silicon oil can be aged, degraded and even broken down, so that the insulating property of the insulating silicon oil is reduced, and the safe operation of the electrical equipment is greatly influenced, so that the detection and evaluation of the aging state of the insulating silicon oil in the equipment is the key for ensuring the safe and stable operation of a power system.
At present, the aging of insulating silicone oil can be divided into various types due to different action factors, such as thermal aging, electrical aging, environmental aging and the like, wherein the thermal aging, the electrical aging and the humid environment play a decisive role in the insulation life of the silicone oil. Although research on the electrothermal and humid aging characteristics and mechanisms of liquid dielectrics has been carried out for decades at home and abroad, the research objects are mostly alkane-based mineral insulating oil such as transformer oil, the differences of basic components are considered, the research conclusion cannot be directly used for the aging analysis of insulating silicone oil, and under the action of electrothermal and humid multifactor aging factors, the existing silicone oil aging detection generally adopts a single test means, cannot comprehensively analyze the electrical and physical and chemical properties of the silicone oil aging process, lacks reasonable evaluation standards and detection schemes for the aging degree of the silicone oil, and limits the efficient production and safe operation and maintenance of a high-voltage cable oil filling terminal.
Therefore, how to provide a method and a system for detecting aging of insulating silicone oil, and an electronic device, which can perform multi-dimensional detection on aging of silicone oil, scientifically evaluate the aging state of silicone oil in a cable terminal, and achieve efficient production and safe operation and maintenance of the terminal, has become a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
In order to solve the technical problems, the application provides an aging detection method and system for insulating silicone oil and electronic equipment, which can carry out multi-dimensional detection on the aging of the silicone oil, scientifically evaluate the aging state of the silicone oil in a cable terminal, and realize efficient production and safe operation and maintenance of the terminal.
The technical scheme provided by the application is as follows:
the application provides an insulation silicone oil aging detection method, which comprises the following steps: s1, sample pretreatment: sampling insulating silicone oil by using a drying container, and then placing the insulating silicone oil in a vacuum drying oven for drying treatment to prepare a silicone oil sample; s2, constructing a test circuit: constructing a voltage regulation test loop, placing the dried silicone oil sample in a constant temperature and humidity environment, connecting the dried silicone oil sample into the loop, adjusting test voltage, adopting a needle plate electrode structure to ensure that the voltage continuously performs electric heating and humidity combined aging treatment on the silicone oil sample after the silicone oil discharges under uneven field intensity; s3, periodic sampling detection: then, a quantitative silicone oil sample is periodically obtained, the silicone oil sample is respectively subjected to water content in oil test, voltage breakdown test, power frequency dielectric loss test, ultraviolet visible spectroscopy test and three-dimensional fluorescence spectroscopy test, and after the physicochemical property parameters of the silicone oil sample are obtained, the change rule of the physicochemical property parameters of each silicone oil sample along with the aging time is analyzed; s4, state evaluation: and finally, comprehensively evaluating the insulation aging degree of the silicone oil by combining the multi-dimensional electrical physical and chemical performance parameter test result to obtain the aging state information of the silicone oil.
Further, in a preferred mode of the present invention, in step S2, the specific step of constructing the test circuit includes:
s201, placing the dried silicone oil sample in a testing container, connecting a needle plate electrode structure in the container, then placing the container in a constant temperature and humidity box, and adjusting the temperature and humidity in the box to a testing temperature;
s202, building a voltage regulating loop, and connecting a needle plate electrode structure into the loop in a mode of leading out a cable from a constant temperature and humidity box, wherein a needle electrode in the needle plate electrode structure is fixed on an aluminum plate of the electrode structure, and the plate electrode is grounded;
s203, slowly increasing the test voltage, monitoring partial discharge signals among the silicone oil by using an oscilloscope until obvious partial discharge signals are observed, and keeping the voltage to continuously carry out electric-thermal-humidity combined aging treatment on the silicone oil sample.
Further, in a preferred mode of the present invention, in step S3, the specific steps of the water content test in oil include:
selecting a certain amount of unaged insulating silicone oil, and obtaining the saturated water content value after the unaged insulating silicone oil is naturally damped;
then, periodically extracting an equivalent amount of the silicone oil sample in a pressure regulating loop, and respectively carrying out Karl Fischer titration test on the silicone oil sample to obtain a micro water content value;
and then, comparing the micro-water content of each silicone oil sample by combining the saturated water content, analyzing the change rule of the water content in the oil and the aging duration, and evaluating the insulation aging degree of the silicone oil according to the change rule.
Further, in a preferred mode of the present invention, in step S3, the specific operation steps of the voltage breakdown test include:
periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
selecting a breakdown voltage test oil cup, adjusting the oil gap distance between the oil cup electrodes, then placing a silicone oil sample in the test oil cup, and regulating and controlling the test temperature;
then magnetically stirring a silicon oil sample, connecting a test circuit for a test oil cup, and gradually performing boosting operation to obtain the breakdown voltage of a silicon oil medium;
and then, comparing the breakdown voltage of each silicon oil sample, analyzing the change rule of the breakdown voltage and the aging duration of each silicon oil sample, and evaluating the insulation aging degree of the silicon oil according to the change rule.
Further, in a preferred embodiment of the present invention, in step S3, the specific operation steps of the power frequency dielectric loss test include:
firstly, extracting unaged insulating silicone oil to obtain a normal power frequency medium loss tangent value of the unaged insulating silicone oil;
then, periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
selecting a medium loss tester, determining a measuring wiring mode of the tester, and connecting a silicone oil sample and a sampling circuit to form a test loop to the tester;
providing high-voltage output, connecting the tester and the test loop, collecting the sample current in the test circuit into the tester, and calculating the ratio of the horizontal component to the vertical component to obtain a power frequency dielectric loss factor tan delta value;
and then, comparing the tan delta value of each silicone oil sample by combining the normal power frequency dielectric loss tangent value, analyzing the change relation between the power frequency dielectric loss factor and the aging duration, and evaluating the insulation aging degree of the silicone oil through the change rule.
Further, in a preferred mode of the present invention, the measurement wiring mode includes: direct connection measurement and reverse connection measurement.
Further, in a preferred mode of the present invention, in step S3, the specific operation steps of the uv-vis spectroscopy test include:
periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
irradiating a silicone oil sample by taking an electromagnetic wave continuous spectrum in an ultraviolet visible light region as a light source, measuring the absorbance of the silicone oil at different wavelengths, and drawing a graph of the relationship between the absorbance and the wavelength, namely an absorption spectrogram of the silicone oil;
then selecting unaged dry insulating silicone oil as a reference sample, and obtaining a reference spectrum of the unaged dry insulating silicone oil;
qualitatively analyzing the silicon oil sample by comparing the silicon oil absorption spectrum with a reference spectrum in a specific wavelength range or by determining the maximum absorption wavelength and measuring the absorption ratio at two specific wavelengths to identify the silicon oil deterioration substances;
on the basis, introducing a UV-Vis spectrum-based mineral oil aging evaluation quantitative characterization parameter, namely DDP (direct Density protein) of a dissolved product in oil, and obtaining a DDP value of each silicon oil sample, namely an area under an absorbance curve with a wave band of 300-650 nm in a silicon oil absorption spectrum;
the aging state of the insulating silicone oil was then characterized by the DDP value of each silicone oil sample.
Further, in a preferred mode of the present invention, in step S3, the specific operation steps of the three-dimensional fluorescence spectrum test include:
periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
selecting a fluorescence spectrophotometer to respectively determine fluorescence emission spectra of the silicone oil under different excitation wavelengths;
then directly selecting the fluorescence intensity at the characteristic position in the predefined area by adopting a peak searching method to obtain the emission wavelength and the excitation wavelength of the peak position of the silicon oil spectrum;
then dividing different areas of the three-dimensional fluorescence spectrum, and calculating the percentage of the volume of a given area by a fluorescence area integration method to quantitatively represent the change of the fluorescent substance;
and finally, representing the aging degree of the silicone oil by combining the emission wavelength and the excitation wavelength of the peak position of the spectrum and the area volume percentage as characteristic parameters to obtain the aging state information of the silicone oil.
The present application provides another technical solution as follows:
the application provides an ageing detecting system of insulating silicone oil includes: the voltage regulating circuit is connected with the high-voltage direct-current power supply and is used for regulating the voltage input of the system;
the voltage regulating circuit includes: a voltage regulating transformer and a voltage boosting transformer; one end of the voltage regulating transformer is connected with an external high-voltage direct-current power supply, and the other end of the voltage regulating transformer is connected with the boosting transformer;
the test circuit is connected with the boosting transformer; a protection resistor and a voltage divider are arranged in the test circuit;
the testing device comprises a constant temperature and humidity box, wherein a testing container used for placing a silicone oil sample is arranged in the constant temperature and humidity box, the testing container is provided with a needle plate electrode structure, and the needle plate electrode structure is connected into a testing loop in a mode of leading out a cable from the constant temperature and humidity box;
and the oscilloscope is connected with the test loop and used for detecting the partial discharge signal of the silicon oil sample when the voltage regulating loop raises the voltage.
Secondly, this application still provides another kind of technical scheme:
an electronic device is provided that includes at least one processor and a memory; the memory stores computer-executable instructions; the at least one processor executes computer-executable instructions stored by the memory to cause the at least one processor to execute the insulation silicone oil aging detection method.
The invention provides a method and a system for detecting the aging of insulating silicone oil and electronic equipment, wherein the method for detecting the aging of the insulating silicone oil comprises the following steps: s1, sample pretreatment: sampling insulating silicone oil by using a drying container, and then placing the insulating silicone oil in a vacuum drying oven for drying treatment to prepare a silicone oil sample; s2, constructing a test circuit: constructing a voltage regulation test loop, placing the dried silicone oil sample in a constant temperature and humidity environment, connecting the dried silicone oil sample into the loop, adjusting test voltage, adopting a needle plate electrode structure to ensure that the voltage continuously performs electric heating and humidity combined aging treatment on the silicone oil sample after the silicone oil discharges under uneven field intensity; s3, periodic sampling detection: then, a quantitative silicone oil sample is periodically obtained, the silicone oil sample is respectively subjected to water-in-oil content test, voltage breakdown test, power frequency dielectric loss test, ultraviolet-visible spectroscopy test and three-dimensional fluorescence spectroscopy test, and after the physicochemical property parameters of the silicone oil sample are obtained, the change rule of the physicochemical property parameters of each silicone oil sample along with the aging duration is analyzed; s4, state evaluation: and finally, comprehensively evaluating the insulation aging degree of the silicone oil by combining the multi-dimensional electrical physical and chemical performance parameter test result to obtain the aging state information of the silicone oil. In the method for detecting the aging of the insulating silicone oil, silicone oil samples with different aging durations are obtained mainly by simulating the electro-thermal-wet aging process of a charging terminal, multidimensional parameter tests are adopted, the change rule of the electrical physical and chemical performance parameters of each silicone oil sample along with the aging duration is analyzed, and the change rule is used as an evaluation means to comprehensively detect and evaluate the insulating silicone oil, so that the aging state information of the insulating silicone oil is obtained; for the treatment of an aging environment, the electrical aging is to perform pressurization treatment on a silicon oil sample through a pressure regulating loop, and the hot environment and the humid environment are realized by placing the silicon oil sample in a constant temperature and constant humidity box in combination with a needle plate electrode structure, and presetting the temperature and humidity to accelerate the aging of the silicon oil; and then, selecting a quantitative silicone oil sample regularly, and analyzing the change rule of the test parameters and the aging duration by performing oil water content test, voltage breakdown test, power frequency dielectric loss test, ultraviolet-visible spectroscopy test and three-dimensional fluorescence spectroscopy test multidimensional test on the silicone oil sample to comprehensively evaluate the aging degree of the silicone oil so as to obtain the aging state information. Therefore, compared with the prior art, the technical scheme provided by the invention can carry out multi-dimensional detection on the aging of the silicone oil, scientifically evaluate the aging state of the silicone oil in the cable terminal, and realize efficient production and safe operation and maintenance of the terminal.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart illustrating steps of a method for detecting aging of insulating silicone oil according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an insulation silicone oil aging detection system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the measurement of water content in oil of silicone oil samples with different aging durations according to an embodiment of the present invention;
FIG. 4 is a diagram of a positive method measurement wiring according to an embodiment of the present invention;
FIG. 5 is a diagram of a reverse-connection measurement wiring according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the measurement of the power frequency dielectric loss tangent values of silicone oil samples with different aging durations according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an ultraviolet-visible spectrum general curve of a silicone oil sample with different aging durations according to an embodiment of the present invention;
FIG. 8 is a schematic diagram showing the measurement of the value of the dissolved product in oil of silicone oil samples for different aging periods according to an embodiment of the present invention;
FIG. 9 is a three-dimensional fluorescence spectrum of a silicone oil sample with different aging durations according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
It will be understood that when an element is referred to as being "fixed" or "disposed" to another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "first," "second," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
As shown in fig. 1 to 9, the present application provides a method and a system for detecting aging of insulating silicone oil, and an electronic device, wherein the method for detecting aging of insulating silicone oil includes the following steps: s1, sample pretreatment: sampling insulating silicone oil by using a drying container, and then placing the insulating silicone oil in a vacuum drying oven for drying treatment to prepare a silicone oil sample; s2, constructing a test circuit: constructing a voltage regulation test loop, placing the dried silicone oil sample in a constant temperature and humidity environment, connecting the dried silicone oil sample into the loop, adjusting test voltage, adopting a needle plate electrode structure to ensure that the voltage continuously performs electric heating and humidity combined aging treatment on the silicone oil sample after the silicone oil discharges under uneven field intensity; s3, periodic sampling detection: then, a quantitative silicone oil sample is periodically obtained, the silicone oil sample is respectively subjected to water-in-oil content test, voltage breakdown test, power frequency dielectric loss test, ultraviolet-visible spectroscopy test and three-dimensional fluorescence spectroscopy test, and after the physicochemical property parameters of the silicone oil sample are obtained, the change rule of the physicochemical property parameters of each silicone oil sample along with the aging duration is analyzed; s4, state evaluation: and finally, comprehensively evaluating the insulation aging degree of the silicone oil by combining the multi-dimensional electrical physical and chemical performance parameter test result to obtain the aging state information of the silicone oil. Compared with the prior art, the technical scheme provided by the invention can be used for carrying out multi-dimensional detection on the aging of the silicone oil, scientifically evaluating the aging state of the silicone oil in the cable terminal and realizing efficient production and safe operation and maintenance of the terminal.
The method for detecting the aging of the insulating silicone oil disclosed by the invention is specifically explained by combining with a specific embodiment, and the method specifically comprises the following steps:
s1, sample pretreatment: the insulating silicone oil was sampled using a drying container, and then placed in a vacuum drying oven to be dried to prepare a silicone oil sample.
Wherein, in the embodiment of the present invention, the sample pretreatment comprises: drying the cleaning beaker at 105 ℃ under 133Pa for 1 hour, then taking out the beaker and placing the beaker in a sealed and dry environment;
taking out the beaker, and pouring the insulating silicone oil into the beaker;
and (3) putting the beaker filled with the silicone oil into a vacuum drying oven, setting the temperature in the oven at 80 ℃ and the pressure at 133Pa, and drying for 48 hours to prepare the silicone oil sample.
S2, constructing a test circuit: and constructing a voltage regulation test loop, placing the dried silicone oil sample in a constant temperature and humidity environment, connecting the dried silicone oil sample into the loop, adjusting the test voltage, adopting a needle plate electrode structure to ensure that the voltage continuously performs electric heating and humidity combined aging treatment on the silicone oil sample after the silicone oil discharges under uneven field intensity.
Specifically, in the embodiment of the present invention, in step S2, the specific step of building the test circuit includes: s201, placing the dried silicone oil sample in a testing container, connecting a needle plate electrode structure in the container, then placing the container in a constant temperature and humidity box, and adjusting the temperature and humidity in the box to a testing temperature; s202, building a voltage regulating loop, and connecting a needle plate electrode structure into the loop in a mode of leading out a cable from a constant temperature and humidity box, wherein a needle electrode in the needle plate electrode structure is fixed on an aluminum plate of the electrode structure, and the plate electrode is grounded; and S203, slowly increasing the test voltage, monitoring partial discharge signals among the silicone oil by using an oscilloscope until an obvious partial discharge signal is observed, and keeping the voltage to continuously carry out electric heating and humidity combined aging treatment on the silicone oil sample.
In the embodiment of the invention, for the establishment of the electric heating and humidity combined aging environment, the oil filling terminal simulates an internal insulation structure of a silicone rubber-impregnated silicone rubber stress cone in an actual oil filling terminal in a mode of placing a silicone rubber gasket on a test electrode plate filled with silicone oil at the periphery. The electric aging is mainly to carry out pressurized aging on a designed aging container through a transformer, and the aging container is composed of insulating silicone oil and a needle plate electrode structure; the realization of the thermal aging and the humid environment is to place the sample aging device in a constant temperature and humidity box, and preset the temperature and humidity in the box to realize the accelerated aging. The high-voltage cable is led out of the constant-temperature and constant-humidity box body, so that a test article in the box body can be pressurized, and the aim of joint aging of the silicone oil under the stress action of electricity, heat and humidity environments is fulfilled.
Specifically, in the embodiment of the invention, the aging container is made of glass, and the needle plate electrode structure is made of metal aluminum; the four pin electrodes are fixed on an aluminum plate and connected with high voltage, the plate electrode is grounded, the diameter of the plate electrode is 100mm, the length of the pin electrode is 20mm, and the curvature radius is 22.43 mu m.
In the embodiment, the needle plate electrode structure is adopted to enable the silicone oil to generate discharge under uneven field intensity in consideration of higher partial discharge initial voltage value of the silicone oil under the even electric field. The specific implementation mode is as follows: and the voltage is gradually increased through the voltage regulating loop, the voltage regulating loop is connected with an oscilloscope for signal monitoring, the oscilloscope is used for observing signals transmitted by the HFCT until stable partial discharge signals are generated, and the voltage at the moment is recorded and maintained.
S3, periodic sampling detection: and then, periodically obtaining a quantitative silicone oil sample, respectively carrying out oil-water content test, voltage breakdown test, power frequency dielectric loss test, ultraviolet-visible light spectroscopy test and three-dimensional fluorescence spectroscopy test on the silicone oil sample, and analyzing the change rule of the electrical and physical property parameters of each silicone oil sample along with the aging time after obtaining the electrical and physical property parameters of the silicone oil sample.
Specifically, in the embodiment of the present invention, in step S3, the specific steps of the water content test in oil include: selecting a certain amount of unaged insulating silicone oil, and obtaining the saturated water content value after the unaged insulating silicone oil is naturally damped; then, periodically extracting an equivalent amount of the silicone oil sample in a pressure regulating loop, and respectively carrying out Karl Fischer titration test on the silicone oil sample to obtain a micro water content value; and then, comparing the micro-water content of each silicone oil sample by combining the saturated water content, analyzing the change rule of the water content in the oil and the aging duration, and evaluating the insulation aging degree of the silicone oil according to the change rule.
In the present embodiment, measurement of water content in oil is performed by coulometry ("coulometry") method for measuring water content in transformer oil and turbine oil during operation. The principle of the water content test of the silicone oil is that an electrolyte, namely a Karl Fischer reagent, required by a test reacts with water in the oil in an electrolysis process, the electric quantity required by the electrolysis is in direct proportion to the consumption of iodine in the reagent, and 1mol of iodine consumed reacts with 1mol of water, so that the quality of the contained water is calculated through the electric quantity consumed by the reaction, and the water content value in the oil is finally obtained.
In the embodiment of the invention, the water content test is carried out for 4 times on the silicone oil under each state, and the saturated water content value of the silicone oil is obtained by naturally absorbing moisture for 96 hours in the early stage. On the basis, the water content value of the silicon oil is reduced to 26ppm after the silicon oil is dried under the vacuum condition of 80 ℃, and the water content value of the silicon oil cannot be reduced to an ideal level in a short time through the experiment because only dissolved water and free water in the oil can be removed by a vacuum drying treatment method. As shown in fig. 3, in the aging process, there are two processes of the moisture in the air entering the silicone oil and the moisture in the oil losing by heating at the same time, the value of the moisture content in the oil gradually increases in the initial stage of aging, which means that the moisture entering rate is greater than the moisture losing rate in this stage, and the moisture content decreases to some extent after 20 days, and the moisture content gradually increases in 40 days, and the reason for the subsequent gradual increase of the moisture content is that the moisture content dissolved in the silicone oil increases with the cracking of the silicone oil. Therefore, the water content value in the oil is one of the most important parameters for evaluating the insulating property of the insulating oil, the water content value of the insulating silicone oil is increased due to aging or moisture, and the aging degree of the silicone oil can be evaluated by quantitatively detecting the change of the water content in the oil.
Specifically, in the embodiment of the present invention, in step S3, the specific operation steps of the voltage breakdown test include: periodically extracting a quantitative silicone oil sample from the pressure regulating loop; selecting a breakdown voltage test oil cup, adjusting the oil gap distance between electrodes of the oil cup, then placing a silicone oil sample in the test oil cup, and regulating and controlling the test temperature; then magnetically stirring a silicone oil sample, then connecting a test circuit for the test oil cup, and gradually performing boosting operation to obtain the breakdown voltage of the silicone oil medium; and then, comparing the breakdown voltage of each silicon oil sample, analyzing the change rule of the breakdown voltage and the aging duration of each silicon oil sample, and evaluating the insulation aging degree of the silicon oil according to the change rule.
In the present example, the electrodes of the breakdown voltage measuring oil cup were made of polished brass, and were formed into a spherical shape having a diameter of 13.0mm, the oil gap distance between the electrodes was 2.5mm, and the depth of immersion of the electrodes into the sample was secured to be not less than 40mm.
Specifically, in the embodiment of the present invention, in step S3, the specific operation steps of the power frequency dielectric loss test include: firstly, extracting unaged insulating silicone oil to obtain a normal power frequency medium loss tangent value of the unaged insulating silicone oil;
then, periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
selecting a medium loss tester, determining a measuring wiring mode of the tester, and connecting a silicone oil sample and a sampling circuit to form a test loop into the tester; providing high-voltage output, connecting the tester and the test loop, collecting sample current in the test circuit into the tester, and obtaining a power frequency dielectric loss factor tan delta value by calculating the ratio of the horizontal component to the vertical component; and then, comparing the tan delta value of each silicone oil sample by combining the normal power frequency dielectric loss tangent value, analyzing the change relation between the power frequency dielectric loss factor and the aging duration, and evaluating the insulation aging degree of the silicone oil through the change rule.
Specifically, in an embodiment of the present invention, the measurement connection manner includes: direct connection measurement and reverse connection measurement.
As shown in fig. 4 and 5, the diagrams are a positive connection method and a reverse connection method for power frequency dielectric loss testing, and the two measurement methods have the following principles: at the 10kV side of the high-voltage power supply, high voltage is divided into two paths, and one path is supplied to an internal standard capacitor C N The dielectric loss of the capacitor is extremely small and can be regarded as zero, namely the capacitor is a pure capacitive current, and the current I is CN Can be used as the capacitive current standard. In a tested object C X One side of the sample, sample current I CX And sampling the resistance R into the machine, and calculating the ratio of the horizontal component to the vertical component to obtain the tan delta value. In the implementation, the positive connection method mainly aims at ungrounded test samples, the measurement process is safe, the result is reliable, the silicon oil sample to be measured needs to be measured repeatedly three times, the repeatability of the test result is ensured, and if the three measurement values have large differences, the connection is checked, the test is carried out again until the measurement result can be repeated more than two times.
As shown in fig. 6, for each aging time point and the value of the dielectric loss tangent of a new sample, an average value is measured three times for each sample as the actual parameter of the sample at the data point, and then the measurement results of each set of samples are processed with Origin. For the power frequency dielectric loss tangent value, the unaged silicone oil is 0.01 percent, and the power frequency dielectric loss value gradually increases to 0.082 percent along with the increase of aging time. Therefore, the aging degree of the silicone oil can be evaluated by quantitatively detecting the change of the power frequency dielectric loss value.
Specifically, in the embodiment of the present invention, in step S3, the specific operation steps of the uv-vis spectroscopy test include: periodically extracting a quantitative silicone oil sample from the pressure regulating loop; irradiating a silicone oil sample by taking an electromagnetic wave continuous spectrum in an ultraviolet visible light region as a light source, measuring the absorbance of the silicone oil at different wavelengths, and drawing a graph of the relationship between the absorbance and the wavelength, namely an absorption spectrogram of the silicone oil; then selecting unaged dry insulating silicone oil as a reference sample, and obtaining a reference spectrum of the unaged dry insulating silicone oil; qualitatively analyzing the silicon oil sample by comparing the silicon oil absorption spectrum with a reference spectrum in a specific wavelength range or by determining the maximum absorption wavelength and measuring the absorption ratio at two specific wavelengths to identify the silicon oil deterioration substances;
on the basis, a UV-Vis spectrum-based mineral oil aging evaluation quantitative characterization parameter, namely a DDP (direct Density P) dissolved product in oil is introduced to obtain a DDP value of each silicone oil sample, namely an area under an absorbance curve with a wave band of 300-650 nm in a silicone oil absorption spectrum; the aging state of the insulating silicone oil was then characterized by the DDP value of each silicone oil sample.
As shown in FIG. 7, the ultraviolet-visible light spectrums of the silicone oils with different aging degrees are shown, and the optical performance of the silicone oil tested in the wave band mainly reflects the content of the dissolution attenuation products in the silicone oil. It can be seen visually from the four curves in the figure that the absorbance curve of the silicone oil gradually shifts up along with the increase of the aging time, but the traditional ultraviolet-visible light spectrum can only carry out qualitative analysis on the aging degree of the silicone oil, and cannot realize accurate evaluation on the aging state of the silicone oil. Therefore, the invention uses the experience of the traditional transformer oil about the DDP value in the oil for reference, and the ASTM D6802 standard which aims at the quantitative analysis of the transformer oil ultraviolet-visible spectrum is properly modified, so that the aging quantitative diagnosis of the insulating silicone oil can be served. The specific implementation mode is as follows: the heptane control of the transformer oil in the standard was modified to not use dry silicone oil; and modifying the integral wave band of 360-600 nm in the standard into 300-650 nm to obtain the DDP value of each silicone oil. As shown in fig. 8, the value of the oil-soluble product of each silicone oil was gradually increased as the aging period was increased; therefore, the aging degree of the silicone oil can be scientifically detected and the aging state information can be obtained by quantitatively analyzing the DDP value of the dissolution product in the oil in the insulating silicone oil.
Specifically, in the embodiment of the present invention, in step S3, the specific operation steps of the three-dimensional fluorescence spectrum test include: periodically extracting a quantitative silicone oil sample from the pressure regulating loop; selecting a fluorescence spectrophotometer to respectively determine fluorescence emission spectra of the silicone oil under different excitation wavelengths; then, directly selecting the fluorescence intensity at the characteristic position in the predefined area by adopting a peak searching method to obtain the emission wavelength and the excitation wavelength of the spectral peak position of the silicone oil; then dividing different areas of the three-dimensional fluorescence spectrum, and calculating the percentage of the volume of a given area by a fluorescence area integration method to quantitatively represent the change of the fluorescent substance; and finally, representing the aging degree of the silicone oil by combining the emission wavelength and the excitation wavelength at the peak position of the spectrum and the volume percentage of the region as characteristic parameters to obtain the aging state information of the silicone oil.
In the embodiment of the invention, a peak searching method is adopted to carry out data analysis on the three-dimensional fluorescence spectrum of the silicone oil. As shown in FIG. 9, EEM spectra of silicone oil were unaged, aged for 10 days, aged for 15 days, aged for 20 days, aged for 90d, aged for 145d, and aged for 190d, respectively. It can be seen from the figure that the fluorescence emission of the silicone oil in the selected area is from 520nm to 580nm, the maximum emission is about 550nm, and the excitation spectrum is expanded from 200nm to 230nm. With aging, the value of the excitation wavelength of the silicone oil corresponding to the emission maximum shifts to higher wavelengths. According to the method, as the aging duration of the silicone oil is increased, the excitation wavelength at the peak position of the EEM spectrum gradually shifts in red, and the excitation wavelength value at the characteristic peak position is quantitatively analyzed to be used as a characteristic parameter to visually represent the aging degree of the silicone oil, so that the aging state information of the silicone oil is obtained.
S4, state evaluation: and finally, comprehensively evaluating the insulation aging degree of the silicone oil by combining the multi-dimensional electrical physical and chemical performance parameter test result to obtain the aging state information of the silicone oil.
And finally, integrating the electrical and physical performance parameters obtained by testing with the change rule of the aging duration, and detecting the insulating silicone oil, so that the insulating aging degree of the silicone oil can be scientifically and comprehensively evaluated, and the aging state information of the silicone oil can be obtained.
The application still provides an ageing detecting system of insulating silicone oil, includes: the voltage regulating circuit is connected with the high-voltage direct-current power supply and is used for regulating the voltage input of the system; the voltage regulating circuit includes: a regulating transformer and a boosting transformer; one end of the voltage regulating transformer is connected with an external high-voltage direct-current power supply, and the other end of the voltage regulating transformer is connected with the boosting transformer; the test circuit is connected with the boosting transformer; a protection resistor and a voltage divider are arranged in the test circuit; the testing device comprises a constant temperature and humidity box, wherein a testing container used for placing a silicone oil sample is arranged in the constant temperature and humidity box, the testing container is provided with a needle plate electrode structure, and the needle plate electrode structure is connected into a testing loop in a mode of leading out a cable from the constant temperature and humidity box; and the oscilloscope is connected with the test loop and used for detecting the partial discharge signal of the silicon oil sample when the voltage regulating loop raises the voltage.
Secondly, this application still provides another kind of technical scheme: an electronic device comprising at least one processor and a memory; the memory stores computer-executable instructions; the at least one processor executes computer-executable instructions stored by the memory to cause the at least one processor to execute the insulation silicone oil aging detection method.
In view of the above, the method and system for detecting the aging of the insulating silicone oil and the electronic device according to the embodiment of the present invention are provided, wherein the method for detecting the aging of the insulating silicone oil mainly includes acquiring silicone oil samples with different aging durations by simulating the electro-thermal-wet aging process of a charging terminal, analyzing the change rule of the physicochemical property parameters of each silicone oil sample along with the aging duration by adopting a multidimensional parameter test, and performing comprehensive detection and evaluation on the insulating silicone oil by using the change rule as an evaluation means, thereby acquiring the aging state information of the insulating silicone oil; for the treatment of an aging environment, the electrical aging is to perform pressurization treatment on a silicon oil sample through a pressure regulating loop, and the hot environment and the humid environment are realized by placing the silicon oil sample in a constant temperature and constant humidity box in combination with a needle plate electrode structure, and presetting the temperature and humidity to accelerate the aging of the silicon oil; and then, selecting a quantitative silicone oil sample regularly, and analyzing the change rule of the test parameters and the aging duration by performing oil water content test, voltage breakdown test, power frequency dielectric loss test, ultraviolet-visible spectroscopy test and three-dimensional fluorescence spectroscopy test multidimensional test on the silicone oil sample to comprehensively evaluate the aging degree of the silicone oil so as to obtain the aging state information. Therefore, compared with the prior art, the technical scheme provided by the invention can be used for carrying out multi-dimensional detection on the aging of the silicone oil, scientifically evaluating the aging state of the silicone oil in the cable terminal and realizing efficient production and safe operation and maintenance of the terminal.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The method for detecting the aging of the insulating silicone oil is characterized by comprising the following steps:
s1, sample pretreatment: sampling insulating silicone oil by using a drying container, and then placing the insulating silicone oil in a vacuum drying oven for drying treatment to prepare a silicone oil sample;
s2, constructing a test circuit: constructing a voltage regulation test loop, placing a dried silicone oil sample in a constant temperature and humidity environment, then connecting the dried silicone oil sample into the loop, adjusting test voltage, adopting a needle plate electrode structure to ensure that the silicone oil generates discharge under uneven field intensity, and then maintaining the voltage to continuously perform electric heating and humidity combined aging treatment on the silicone oil sample;
s3, periodic sampling detection: then, a quantitative silicone oil sample is periodically obtained, the silicone oil sample is respectively subjected to water-in-oil content test, voltage breakdown test, power frequency dielectric loss test, ultraviolet-visible spectroscopy test and three-dimensional fluorescence spectroscopy test, and after the physicochemical property parameters of the silicone oil sample are obtained, the change rule of the physicochemical property parameters of each silicone oil sample along with the aging duration is analyzed;
s4, state evaluation: and finally, comprehensively evaluating the insulation aging degree of the silicone oil by combining the multi-dimensional electrical physical and chemical performance parameter test result to obtain the aging state information of the silicone oil.
2. The method for detecting the aging of insulating silicone oil according to claim 1, wherein in step S2, the specific step of constructing a test circuit comprises:
s201, placing the dried silicone oil sample in a testing container, connecting a needle plate electrode structure in the container, then placing the container in a constant temperature and humidity box, and adjusting the temperature and humidity in the box to a testing temperature;
s202, building a voltage regulating loop, and connecting a needle plate electrode structure into the loop in a mode of leading out a cable from a constant temperature and humidity box, wherein a needle electrode in the needle plate electrode structure is fixed on an aluminum plate of the electrode structure, and the plate electrode is grounded;
s203, slowly increasing the test voltage, monitoring partial discharge signals among the silicone oil by using an oscilloscope until obvious partial discharge signals are observed, and keeping the voltage to continuously carry out electric-thermal-humidity combined aging treatment on the silicone oil sample.
3. The method for detecting the aging of insulating silicone oil according to claim 1, wherein in step S3, the specific steps of the water content test in oil include:
selecting a certain amount of unaged insulating silicone oil, and obtaining the saturated water content value after the unaged insulating silicone oil is naturally damped;
then, periodically extracting an equivalent amount of the silicone oil sample in a pressure regulating loop, and respectively carrying out Karl Fischer titration test on the silicone oil sample to obtain a micro water content value;
and then, comparing the micro-water content of each silicon oil sample by combining the saturated water content, analyzing the change rule of the water content in the oil and the aging duration, and evaluating the insulation aging degree of the silicon oil according to the change rule.
4. The method for detecting the aging of insulating silicone oil according to claim 3, wherein in step S3, the specific operation steps of the voltage breakdown test comprise:
periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
selecting a breakdown voltage test oil cup, adjusting the oil gap distance between electrodes of the oil cup, then placing a silicone oil sample in the test oil cup, and regulating and controlling the test temperature;
then magnetically stirring a silicon oil sample, connecting a test circuit for a test oil cup, and gradually performing boosting operation to obtain the breakdown voltage of a silicon oil medium;
and then, comparing the breakdown voltage of each silicon oil sample, analyzing the change rule of the breakdown voltage and the aging duration of each silicon oil sample, and evaluating the insulation aging degree of the silicon oil according to the change rule.
5. The method for detecting the aging of the insulating silicone oil according to claim 3, wherein in step S3, the specific operation steps of the power frequency dielectric loss test include:
firstly, extracting unaged insulating silicone oil to obtain a normal power frequency medium loss tangent value of the unaged insulating silicone oil;
then, periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
selecting a medium loss tester, determining a measuring wiring mode of the tester, and connecting a silicone oil sample and a sampling circuit to form a test loop to the tester;
providing high-voltage output, connecting the tester and the test loop, collecting sample current in the test circuit into the tester, and obtaining a power frequency dielectric loss factor tan delta value by calculating the ratio of the horizontal component to the vertical component;
and then, comparing the tan delta value of each silicone oil sample by combining the normal power frequency dielectric loss tangent value, analyzing the change relation between the power frequency dielectric loss factor and the aging duration, and evaluating the insulation aging degree of the silicone oil through the change rule.
6. The method for detecting the aging of insulating silicone oil according to claim 5, wherein the measuring wiring manner comprises: direct connection measurement and reverse connection measurement.
7. The method for detecting the aging of insulating silicone oil according to claim 3, wherein in step S3, the specific operation steps of the ultraviolet-visible spectrum test include:
periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
irradiating a silicone oil sample by taking an electromagnetic wave continuous spectrum in an ultraviolet visible light region as a light source, measuring the absorbance of the silicone oil at different wavelengths, and drawing a graph of the relationship between the absorbance and the wavelength, namely an absorption spectrogram of the silicone oil;
then selecting unaged dry insulating silicone oil as a reference sample, and obtaining a reference spectrum of the unaged dry insulating silicone oil;
qualitatively analyzing the silicon oil sample by comparing the silicon oil absorption spectrum with a reference spectrum in a specific wavelength range or by determining the maximum absorption wavelength and measuring the absorption ratio at two specific wavelengths to identify the silicon oil deterioration substances;
on the basis, a UV-Vis spectrum-based mineral oil aging evaluation quantitative characterization parameter, namely a DDP (direct Density P) dissolved product in oil is introduced to obtain a DDP value of each silicone oil sample, namely an area under an absorbance curve with a wave band of 300-650 nm in a silicone oil absorption spectrum;
the aging state of the insulating silicone oil was then characterized by the DDP value of each silicone oil sample.
8. The method for detecting the aging of insulating silicone oil according to claim 3, wherein in step S3, the specific operation steps of the three-dimensional fluorescence spectrum test comprise:
periodically extracting a quantitative silicone oil sample from the pressure regulating loop;
selecting a fluorescence spectrophotometer to respectively determine fluorescence emission spectra of the silicone oil under different excitation wavelengths;
then directly selecting the fluorescence intensity at the characteristic position in the predefined area by adopting a peak searching method to obtain the emission wavelength and the excitation wavelength of the peak position of the silicon oil spectrum;
then dividing different areas of the three-dimensional fluorescence spectrum, and calculating the percentage of the volume of a given area by a fluorescence area integration method to quantitatively represent the change of the fluorescent substance;
and finally, representing the aging degree of the silicone oil by combining the emission wavelength and the excitation wavelength at the peak position of the spectrum and the volume percentage of the region as characteristic parameters to obtain the aging state information of the silicone oil.
9. An insulation silicone oil aging detection system, comprising:
the voltage regulating circuit is connected with the high-voltage direct-current power supply and is used for regulating the voltage input of the system;
the voltage regulating circuit includes: a regulating transformer and a boosting transformer; one end of the voltage regulating transformer is connected with an external high-voltage direct-current power supply, and the other end of the voltage regulating transformer is connected with the boosting transformer;
the test circuit is connected with the boosting transformer; a protection resistor and a voltage divider are arranged in the test circuit;
the testing device comprises a constant temperature and humidity box, a testing container used for placing a silicone oil sample is arranged in the constant temperature and humidity box, the testing container is provided with a needle plate electrode structure, and the needle plate electrode structure is connected into a testing loop in a mode of leading out a cable from the constant temperature and humidity box;
and the oscilloscope is connected with the test loop and used for detecting the partial discharge signal of the silicon oil sample when the voltage regulating loop raises the voltage.
10. An electronic device comprising at least one processor and memory; the memory stores computer-executable instructions; the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to execute the method for detecting aging of insulating silicone oil according to any one of claims 1 to 8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148448A (en) * | 2023-04-23 | 2023-05-23 | 中国科学院上海高等研究院 | Tester for oil service performance under multi-physical field coupling effect |
| CN117589976B (en) * | 2024-01-18 | 2024-04-05 | 华北电力科学研究院有限责任公司 | Method and device for measuring moisture of silicone rubber of cable terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148448A (en) * | 2023-04-23 | 2023-05-23 | 中国科学院上海高等研究院 | Tester for oil service performance under multi-physical field coupling effect |
| CN117589976B (en) * | 2024-01-18 | 2024-04-05 | 华北电力科学研究院有限责任公司 | Method and device for measuring moisture of silicone rubber of cable terminal |
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