CN104330711A - Saturated reactor insulation accelerated aging test device and test method - Google Patents

Saturated reactor insulation accelerated aging test device and test method Download PDF

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CN104330711A
CN104330711A CN201410584918.5A CN201410584918A CN104330711A CN 104330711 A CN104330711 A CN 104330711A CN 201410584918 A CN201410584918 A CN 201410584918A CN 104330711 A CN104330711 A CN 104330711A
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sample
aging
test
insulation
discharge
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CN104330711B (en
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黄旭炜
鲁旭
王安东
王健
韩帅
李庆民
王高勇
刘伟杰
曹志伟
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
North China Electric Power University
China EPRI Electric Power Engineering Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
North China Electric Power University
China EPRI Electric Power Engineering Co Ltd
Smart Grid Research Institute of SGCC
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Abstract

The invention discloses a saturated reactor insulation accelerated aging test device and a test method belonging to insulation material aging evaluation test technology. The saturated reactor insulation accelerated aging test device is built, and the aging condition of novel saturated reactor insulation in practical operation is simulated. By designing and manufacturing a model test object, change of discharging phenomenological parameters and dielectric, physical and chemical properties of novel saturated reactor insulation material epoxy resin including local discharging characteristic quantities, broadband dielectric loss frequency spectrums and Fourier transform infrared spectrums before and after accelerated aging test is tested and analyzed, and the aging state is evaluated. The method can be an important detection means for performing delivery test on a novel saturated reactor by manufacturers and evaluating the aging state of the saturated reactor by electric power companies, the aging state of the saturated reactor is accurately evaluated, the overall running state of an ultrahigh voltage direct current power transmission system is further evaluated, and the method has important significance for improving reliability of a cross-regional high-capacity strong large power grid, reducing running and maintaining cost and the like.

Description

A kind of insulation accelerated ageing test apparatus of saturable reactor and test method
Technical field
The invention belongs to insulating material Aging Assessment experimental technique field, particularly relate to the insulation accelerated ageing test apparatus of a kind of saturable reactor and test method.
Background technology
Along with the development of spy/super high voltage direct current electricity transmission technology, be widely used in its asynchronous contact in remote bulk power transmission, cable power transmission and AC system etc.Comprise the HVDC (High Voltage Direct Current) transmission system of DC converter valve, direct current transformer and saturable reactor, both formed the main body of Modern New DC transmission system, cause again the source of DC transmission system accident and electric grid large area power cut accident.Different from the power equipment operating in conventional power frequency 50Hz, during the normal operation of saturable reactor, the damage of insulation is mainly born to the electric stress of high-voltage pulse from it.According to relevant operating experience and research, the steep voltage escalating rate that high-voltage pulse brings obviously can aggravate the deterioration of insulating material, causes its insulation premature aging.Therefore, how to assess the ageing state of saturable reactor, avoid the insulation ag(e)ing because of saturable reactor to cause the accident, become the previous important topic of order.
For the assessment of saturable reactor insulation ag(e)ing state, be exactly mainly that the ageing state under the service condition of saturable reactor mainly under embedding insulating material epoxy resin state is studied.Abroad just start at 20 century 70s and the insulation weak-point of epoxide resin material detected and the research of ageing management technology, but mainly the ageing state under power frequency sinusoidal voltage is in it.For the detect delay of epoxy resins insulation ageing state under 50/60Hz power frequency, mainly concentrate on the evaluation studies for measure.And the epoxide resin material under the running environment of saturable reactor is assessed research in the field of business to ageing state and carried out more late, engineering is also generally acknowledged can for promoting and the aging test of industry and detection technique and equipment accordingly thereof.Due to above-mentioned, the data under the novel saturable reactor condition of high-frequency impulse, the ageing state of epoxy resin studied and testing standard accumulation less, and lack the research technique of relevant operational.
Summary of the invention
The object of the present invention is to provide the insulation accelerated ageing test apparatus of a kind of saturable reactor and test method, it is characterized in that, the insulation accelerated ageing test apparatus of described saturable reactor is that constant temperature roaster 6 bottom arranges heatproof insulating support 8, and test product embedding box is placed on heatproof insulating support 8; High frequency pulse power supply is formed by generator 1 and power amplifier 2; at high-voltage output end series connection protective resistance 3, trigger current sensor 4 and the digital oscilloscope 5 of power amplifier 2; protective resistance 3 is connected with sample high-field electrode I with the node of, trigger current sensor 4; the earth terminal of power amplifier 2 connects sample ground electrode II, and the leakage current sensor 9 be connected on sample ground electrode II is connected with digital oscilloscope 5.
The insulation accelerated aging test test method of saturable reactor, it is characterized in that, implementation step comprises: produce aging insulation sample, electric heating associating aging, gather in ageing process and the phenomenological data of aging rear sample, the dielectric of testing aging front test agent and physicochemical property, ageing state assessment; Specific as follows:
1) sample preparation
(1) get High Temperature Curing Epoxy Resin System raw material, material composition is pressed 3MTMScotch-WeldTM bicomponent structural type 2216B/A epoxy resin embedding adhesive by the perfusion code manufactured according to common apparatus, mixes B:A=2:3 by volume;
(2) sample high-field electrode I, sample ground electrode II are inserted the embedding box 7 customized in advance, make two electrodes remain on certain distance L=1.2mm, ± 0.05mm;
(3) raw material that above-mentioned (1) prepares is filled in embedding box 7, then be placed on mix up 120 DEG C in advance constant temperature roaster 6 in solidify 2h, take out;
(4) the encapsulated epoxy resin sample of acquisition is cleaned in absolute ethyl alcohol, then carry out cleaning treatment with ultrasonic, remove the impact of surface impurity, the sample after process is taken out after constant temperature 50 DEG C of dry 2h in constant temperature roaster 6;
2) electric heating associating is aging
(1) the sample high-field electrode I of sample embedding box 7, sample ground electrode II are connected on high-pressure side and ground electrode respectively, and by whole for the sample embedding box 7 heatproof insulating support 8 be placed in constant temperature roaster 6;
(2) sample is applied to the unipolarity high-frequency pulse voltage of 10kV, its frequency is 5kHz, rising edge is 5 μ s, and in constant temperature roaster 6, temperature is set to 120 DEG C, takes out for subsequent use after in succession carrying out the electric heating associating aging test of 100h, 200h, 300h;
3) phenomenological data analysis test
(1) data acquisition, obtains the real-time partial discharge pulse voltage signal on the ground wire be connected with sample in ageing process and trigger voltage signal by trigger current sensor 9;
(2) tidal data recovering, by above-mentioned voltage signal by co-axial cables transport to digital oscilloscope, and by usb protocol, the voltage data of discretize is transferred to computing machine;
(3) data processing, computing machine 12 obtains real-time voltage signal from digital oscilloscope 5, and carries out filtering process to obtained live signal;
(4) data store, and are kept in database 11 by the data of the enforcement voltage signal processed after filtering, with history of forming voltage data, are provided with analyzing and ageing state analysis;
(5) data analysis, by data handling system 10, analyzes the history voltage data storing gained, extracts local discharge characteristic parameter, form phenmenological analysis collection of illustrative plates, the insulation ag(e)ing state of analytical sample;
4) dielectric and physicochemical property testing experiment, Wide-band dielectric loss frequency spectrum is tested, and uses wideband dielectric electric impedance analyzer test frequency 5 × 10 -2~ 10 3within the scope of Hz, the dielectric loss value of sample during change, is defined as the test voltage of 1kV, test 20 DEG C, carry out under vacuum condition; The sample that aging test each stage obtains is tested respectively, in scanning wide frequency range, obtains the frequency spectrum of dielectric impedance;
5) FTIR spectrum, infrared spectrometer is adopted to analyze sample, in experiment, the embedding sample after aging is extracted the square sheet sample that top layer insulating material makes 50mm*50mm and carry out Infrared spectrum scanning, experimental result is read by OPUS-Viewer software;
6) ageing state assessment
(1) phenomenological judges state estimation
By phenomenological data analysis, online obtain maximum pd quantity phase resolved plot, mean discharge magnitude phase resolved plot, electric discharge amplitude phase resolved plot, discharge time phase resolved plot have above-mentioned collection of illustrative plates to obtain three-dimensional Φ-Q-N collection of illustrative plates, wherein:
Described maximum pd quantity phase resolved plot, represents the maximum pd quantity being distributed in each several part in whole phase region;
Described mean discharge magnitude phase resolved plot, represents the mean discharge magnitude being distributed in each several part in whole phase region;
Described electric discharge amplitude distribution collection of illustrative plates, represents the statistics of the discharge time to different amplitude;
Described discharge time phase resolved plot, represents the discharge time being distributed in each several part in whole phase region;
Φ-Q-N figure spectral representation discharge capacity, relation between discharge time and discharge phase are described thus, and obviously found out by above-mentioned frequency spectrum, along with the increase of digestion time, the otherness of TuPu method statistic increases gradually; Illustrate that electric discharge collection of illustrative plates and its degree of aging of saturable reactor insulation sample exist obvious correlativity; Therefore, online acquisition leakage current data obtains and carries out phenomenological and judge to be used for assessment saturable reactor insulation ag(e)ing state;
(2) dielectric and physicochemical property assessment, because its Wide-band dielectric loss spectrum curve of sample of different digestion time has notable difference, along with digestion time increases, by the feature that sample medium loss value is increasing on whole frequency spectrum, illustrate that dielectric loss and degree of aging exist obvious correlativity; Therefore can be used for assessing saturable reactor insulation ag(e)ing state to the measurement of dielectric loss frequency spectrum;
(3) carrying out in Infrared spectroscopy to the test sample extracted from saturable reactor embedding insulation specimen surface, the increase along with digestion time can be found, obvious increase can be there is in the absorbance log near specific wave number, this just meaning also there is obvious correlativity to the infrared spectrum of reactor insulation sample and its degree of aging; Therefore can be used for equally assessing saturable reactor insulation ag(e)ing state to the measurement of infrared spectrum.
The invention has the beneficial effects as follows that the technical scheme that its technical matters of solution adopts is: set up the insulation accelerated ageing test apparatus of the novel saturable reactor of a kind of high voltage direct current transmission converter valve parts, the aging conditions of novel saturable reactor built-in electrical insulation in simulation actual motion.By to before and after accelerated deterioration and in ageing process the Phenomenological parameters of stage insulating material and the change of dielectric and physicochemical property, comprise the characteristic quantity of shelf depreciation, Wide-band dielectric loss frequency spectrum, FTIR spectrum, its ageing state is assessed.In a word, the inventive method operation is relatively simple, is easy to realize.And pass through the acting in conjunction of phenomenological, dielectric and physicochemical property, can fast and effeciently assess the ageing state of saturable reactor insulation.
Accompanying drawing explanation
Fig. 1 is saturable reactor insulated electro heat integration senile experiment platform.
Fig. 2 is the sample model of saturable reactor Insulation Test.
Fig. 3 is maximum pd quantity phase resolved plot, wherein a) 100h, b) 200h, c) 300h.
Fig. 4 is mean discharge magnitude phase resolved plot, wherein a) 100h, b) 200h, c) 300h.
Fig. 5 is electric discharge amplitude distribution collection of illustrative plates, wherein a) 100h, b) 200h, c) 300h.
Fig. 6 is discharge time phase resolved plot, wherein a) 100h, b) 200h, c) 300h.
Fig. 7 is the Φ-Q-N collection of illustrative plates of the different ageing step electric discharge of saturable reactor insulation, wherein a) aging 100h, b) aging 200h, c) aging 300h.
Embodiment
The invention provides the insulation accelerated ageing test apparatus of a kind of saturable reactor and test method, be explained below in conjunction with drawings and Examples.
In the saturable reactor insulated electro heat integration senile experiment platform shown in Fig. 1, the insulation accelerated ageing test apparatus of this saturable reactor is that constant temperature roaster 6 bottom arranges heatproof insulating support 8, and test product embedding box is placed on heatproof insulating support 8; High frequency pulse power supply is formed by generator 1 and power amplifier 2; at high-voltage output end series connection protective resistance 3, trigger current sensor 4 and the digital oscilloscope 5 of power amplifier 2; protective resistance 3 is connected with sample high-field electrode I with the node of, trigger current sensor 4; the earth terminal of power amplifier 2 connects sample ground electrode II, and the leakage current sensor 9 be connected on sample ground electrode II is connected with digital oscilloscope 5.
The insulation accelerated aging test test method of saturable reactor, it is characterized in that, implementation step comprises: produce aging insulation test agent, electric heating associating aging, gather in ageing process and the phenomenological data of aging rear test agent, the dielectric of testing aging front test agent and physicochemical property, ageing state assessment; Specific as follows:
1) sample preparation
(1) get High Temperature Curing Epoxy Resin System raw material, material composition is pressed 3MTMScotch-WeldTM bicomponent structural type 2216B/A epoxy resin embedding adhesive by the perfusion code manufactured according to common apparatus, mixes B:A=2:3 by volume;
(2) sample high-field electrode I, sample ground electrode II are inserted the embedding box 7 customized in advance, make two electrodes remain on certain distance L=1.2mm, ± 0.05mm (as shown in Figure 2);
(3) raw material that above-mentioned (1) prepares is filled in embedding box 7, then be placed on mix up 120 DEG C in advance constant temperature roaster 6 in solidify 2h, take out;
(4) the encapsulated epoxy resin sample of acquisition is cleaned in absolute ethyl alcohol, then carry out cleaning treatment with ultrasonic, remove the impact of surface impurity, the sample after process is taken out after constant temperature 50 DEG C of dry 2h in constant temperature roaster 6;
2) electric heating associating is aging
(1) the sample high-field electrode I of sample embedding box 7, sample ground electrode II are connected on high-pressure side and ground electrode respectively, and by whole for the sample embedding box 7 heatproof insulating support 8 be placed in constant temperature roaster 6;
(2) sample is applied to the unipolarity high-frequency pulse voltage of 10kV, its frequency is 5kHz, rising edge is 5 μ s, and in constant temperature roaster 6, temperature is set to 120 DEG C, takes out for subsequent use after in succession carrying out the electric heating associating aging test of 100h, 200h, 300h;
3) phenomenological data analysis test
(1) data acquisition, obtains the real-time partial discharge pulse voltage signal on the ground wire be connected with sample in ageing process and trigger voltage signal by trigger current sensor 9;
(2) tidal data recovering, by above-mentioned voltage signal by co-axial cables transport to digital oscilloscope, and by usb protocol, the voltage data of discretize is transferred to computing machine;
(3) data processing, computing machine 12 obtains real-time voltage signal from digital oscilloscope 5, and carries out filtering process to obtained live signal;
(4) data store, and are kept in database 11 by the data of the enforcement voltage signal processed after filtering, with history of forming voltage data, are provided with analyzing and ageing state analysis;
(5) data analysis, by data handling system 10, analyzes the history voltage data storing gained, extracts local discharge characteristic parameter, form phenmenological analysis collection of illustrative plates, the insulation ag(e)ing state of analytical sample;
4) dielectric and physicochemical property testing experiment, Wide-band dielectric loss frequency spectrum is tested, and uses wideband dielectric electric impedance analyzer test frequency 5 × 10 -2~ 10 3within the scope of Hz, the dielectric loss value of sample during change, is defined as the test voltage of 1kV, test 20 DEG C, carry out under vacuum condition; The sample that aging test each stage obtains is tested respectively, in scanning wide frequency range, obtains the frequency spectrum (as shown in Figure 3, wherein a) 100h, b) 200h, c) 300h) of dielectric impedance;
5) FTIR spectrum, infrared spectrometer is adopted to analyze sample, in experiment, embedding sample after aging is extracted the square sheet sample that top layer insulating material makes 50mm*50mm and carry out Infrared spectrum scanning, experimental result reads (as shown in Figure 4, wherein a) 100h, b) 200h, c) 300h) by OPUS-Viewer software;
6) ageing state assessment
(1) phenomenological judges state estimation
By phenomenological data analysis, online acquisition maximum pd quantity phase resolved plot, mean discharge magnitude phase resolved plot, electric discharge amplitude phase resolved plot, discharge time phase resolved plot and Φ-Q-N collection of illustrative plates (as shown in Figure 5, wherein a) 100h, b) 200h, c) 300h); Wherein:
Described maximum pd quantity phase resolved plot, represents the maximum pd quantity being distributed in each several part in whole phase region;
Described mean discharge magnitude phase resolved plot, represents the mean discharge magnitude (as shown in Figure 7 wherein a) aging 100h, b) aging 200h, c) aging 300h) being distributed in each several part in whole phase region;
Described electric discharge amplitude distribution collection of illustrative plates, represents the statistics of the discharge time to different amplitude;
Described discharge time phase resolved plot, represents the discharge time being distributed in each several part in whole phase region;
Φ-Q-N figure spectral representation discharge capacity, relation between discharge time and discharge phase are described thus, and obviously found out by above-mentioned frequency spectrum, along with the increase of digestion time, the otherness of TuPu method statistic increases gradually;
Illustrate that electric discharge collection of illustrative plates and its degree of aging of saturable reactor insulation sample exist obvious correlativity; Therefore, online acquisition leakage current data obtains and carries out phenomenological and judge to be used for assessment saturable reactor insulation ag(e)ing state;
(2) dielectric and physicochemical property assessment, because its Wide-band dielectric loss spectrum curve of sample of different digestion time has notable difference, along with digestion time increases, by the feature that sample medium loss value is increasing on whole frequency spectrum, illustrate that dielectric loss and degree of aging exist obvious correlativity; Therefore can be used for assessing saturable reactor insulation ag(e)ing state (as shown in Figure 3) to the measurement of dielectric loss frequency spectrum;
(3) the test sample extracted from saturable reactor embedding insulation specimen surface carries out (as shown in Figure 4) Infrared spectroscopy, the increase along with digestion time can be found, can be there is obvious increase in the absorbance log near specific wave number, this just means that therefore also there is obvious correlativity to the infrared spectrum with reactor insulation sample with its degree of aging assesses saturable reactor insulation ag(e)ing state to same can being used for of the measurement of infrared spectrum.

Claims (2)

1. the insulation accelerated ageing test apparatus of saturable reactor, it is characterized in that, the insulation accelerated ageing test apparatus of described saturable reactor is that constant temperature roaster (6) bottom arranges heatproof insulating support (8), and (7 are placed on heatproof insulating support (8) sample embedding box; High frequency pulse power supply is formed by generator (1) and power amplifier (2), at high-voltage output end series connection protective resistance (3), trigger current sensor (4) and the digital oscilloscope (5) of power amplifier (2), protective resistance (3) is connected with sample high-field electrode (I) with the node of, trigger current sensor (4), the earth terminal of power amplifier (2) connects sample ground electrode (II), and the leakage current sensor (9) be connected on sample ground electrode (II) is connected with digital oscilloscope (5); (5 are cascaded with computing machine (12), database (11) and disposal system (10) digital oscilloscope again.
2. the insulation accelerated aging test test method of saturable reactor, it is characterized in that, implementation step comprises: produce aging insulation sample, electric heating associating aging, gather in ageing process and the phenomenological data of aging rear sample, the dielectric of testing aging front test agent and physicochemical property, ageing state assessment; Specific as follows:
1) sample preparation
(1) get High Temperature Curing Epoxy Resin System raw material, material composition is pressed 3MTMScotch-WeldTM bicomponent structural type 2216B/A epoxy resin embedding adhesive by the perfusion code manufactured according to common apparatus, mixes by volume: B:A=2:3;
(2) sample high-field electrode I, sample ground electrode II are inserted the sample embedding box customized in advance, make two electrodes remain on certain distance L=1.2mm, ± 0.05mm
(3) raw material that above-mentioned (1) prepares is filled in sample embedding box, then be placed on mix up 120 DEG C in advance constant temperature roaster in solidify 2h, take out;
(4) the encapsulated epoxy resin sample of acquisition is cleaned in absolute ethyl alcohol, then carry out cleaning treatment with ultrasonic, remove the impact of surface impurity, the sample after process is taken out after constant temperature 50 DEG C of dry 2h in constant temperature roaster;
2) electric heating associating is aging
(1) the sample high-field electrode I of sample embedding box 7, sample ground electrode II are connected on high-pressure side and ground electrode respectively, and by whole for the sample embedding box heatproof insulating support be placed in constant temperature roaster;
(2) sample is applied to the unipolarity high-frequency pulse voltage of 10kV, its frequency is 5kHz, rising edge is 5 μ s, and thermostatic roasting the temperature inside the box is set to 120 DEG C, takes out for subsequent use after in succession carrying out the electric heating associating aging test of 100h, 200h, 300h;
3) phenomenological data analysis test
(1) data acquisition, obtains the real-time partial discharge pulse voltage signal on the ground wire be connected with sample in ageing process and trigger voltage signal by trigger current sensor;
(2) tidal data recovering, by above-mentioned voltage signal by co-axial cables transport to digital oscilloscope, and by usb protocol, the voltage data of discretize is transferred to computing machine;
(3) data processing, computing machine obtains real-time voltage signal from digital oscilloscope, and carries out filtering process to obtained live signal;
(4) data store, and the data of the enforcement voltage signal processed after filtering are preserved in a database, with history of forming voltage data, are provided with analyzing and ageing state analysis;
(5) data analysis, by data handling system, analyzes the history voltage data storing gained, extracts local discharge characteristic parameter, form phenmenological analysis collection of illustrative plates, the insulation ag(e)ing state of analytical sample;
4) dielectric and physicochemical property testing experiment, Wide-band dielectric loss frequency spectrum is tested, and uses wideband dielectric electric impedance analyzer test frequency 5 × 10 -2~ 10 3within the scope of Hz, the dielectric loss value of sample during change, is defined as the test voltage of 1kV, test 20 DEG C, carry out under vacuum condition; The sample that aging test each stage obtains is tested respectively, in scanning wide frequency range, obtains the frequency spectrum of dielectric impedance;
5) FTIR spectrum, infrared spectrometer is adopted to analyze sample, in experiment, the embedding sample after aging is extracted the square sheet sample that top layer insulating material makes 50mm*50mm and carry out Infrared spectrum scanning, experimental result is read by OPUS-Viewer software;
6) ageing state assessment
(1) phenomenological judges state estimation
By phenomenological data analysis, online acquisition maximum pd quantity phase resolved plot, mean discharge magnitude phase resolved plot, electric discharge amplitude phase resolved plot, discharge time phase resolved plot and Φ-Q-N collection of illustrative plates, wherein:
Described maximum pd quantity phase resolved plot, represents the maximum pd quantity being distributed in each several part in whole phase region;
Described mean discharge magnitude phase resolved plot, represents the mean discharge magnitude being distributed in each several part in whole phase region;
Described electric discharge amplitude distribution collection of illustrative plates, represents the statistics of the discharge time to different amplitude;
Described discharge time phase resolved plot, represents the discharge time being distributed in each several part in whole phase region;
Φ-Q-N figure spectral representation discharge capacity, relation between discharge time and discharge phase are described thus, and obviously found out by above-mentioned frequency spectrum, along with the increase of digestion time, the otherness of TuPu method statistic increases gradually; Illustrate that electric discharge collection of illustrative plates and its degree of aging of saturable reactor insulation sample exist obvious correlativity; Therefore, online acquisition leakage current data obtains and carries out phenomenological and judge to be used for assessment saturable reactor insulation ag(e)ing state;
(2) dielectric and physicochemical property assessment, because its Wide-band dielectric loss spectrum curve of sample of different digestion time has notable difference, along with digestion time increases, by the feature that sample medium loss value is increasing on whole frequency spectrum, illustrate that dielectric loss and degree of aging exist obvious correlativity; Therefore can be used for assessing saturable reactor insulation ag(e)ing state to the measurement of dielectric loss frequency spectrum;
(3) carrying out in Infrared spectroscopy to the test sample extracted from saturable reactor embedding insulation specimen surface, the increase along with digestion time can be found, obvious increase can be there is in the absorbance log near specific wave number, this just meaning also there is obvious correlativity to the infrared spectrum of reactor insulation sample and its degree of aging; Therefore can be used for equally assessing saturable reactor insulation ag(e)ing state to the measurement of infrared spectrum.
CN201410584918.5A 2014-10-27 2014-10-27 Saturated reactor insulation accelerated aging test device and test method Expired - Fee Related CN104330711B (en)

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CN106918765A (en) * 2015-12-25 2017-07-04 国网智能电网研究院 The experimental rig and test method of a kind of saturable reactor for converter valve heat ageing
CN105866015A (en) * 2016-05-12 2016-08-17 远东电缆有限公司 Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy
CN108508332A (en) * 2018-03-20 2018-09-07 四川大学 Insulating materials Inverter fed motor life-span Multi-path synchronous test device under thermal-electrical aging environment
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