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

Abstract

The invention discloses a saturable reactor insulation accelerated aging test device and a test method, which belong to the insulating material aging evaluation test technology. The invention establishes a saturable reactor insulation accelerated aging test device to simulate the aging condition of the novel saturated reactor insulation in actual operation. By designing and making model samples, testing and analyzing the changes of discharge phenomenological parameters and dielectric and physical and chemical properties of epoxy resin, a new type of insulating material for saturable reactors before and after accelerated aging tests, including characteristic quantities of partial discharge, broadband dielectric loss spectrum, Fu Infrared spectroscopy to assess its aging state. This method can become an important detection method for manufacturers to carry out factory tests of new-type saturable reactors and for power companies to evaluate the aging state of saturated reactors. It can accurately evaluate the aging state of saturated reactors and then evaluate the overall operating state of the UHVDC transmission system, and improve cross-regional The reliability of the large-capacity strong power grid, the reduction of operation and maintenance costs, and many other aspects are of great significance.

Description

A Saturable Reactor Insulation Accelerated Aging Test Device and Test Method

technical field

The invention belongs to the technical field of insulation material aging evaluation tests, and in particular relates to a saturable reactor insulation accelerated aging test device and a test method.

Background technique

With the development of UHV/EHVDC transmission technology, it has been widely used in long-distance high-power transmission, cable transmission and asynchronous communication of AC systems. The HVDC transmission system, including DC converter valves, DC voltage converters and saturable reactors, not only constitutes the main body of the modern new DC transmission system, but also causes the source of DC transmission system accidents and large-scale power outage accidents. Unlike power equipment operating at a conventional power frequency of 50Hz, when a saturable reactor is in normal operation, the damage to the insulation mainly comes from the electrical stress of the high-voltage pulse voltage it bears. According to relevant operating experience and research, the steep voltage rise rate brought by high-voltage pulse voltage will obviously aggravate the deterioration of electrical insulation materials, leading to premature aging of its insulation. Therefore, how to evaluate the aging state of the saturable reactor and avoid accidents caused by the insulation aging of the saturable reactor has become an important issue at present.

The evaluation of the aging state of the saturable reactor insulation is mainly to study the aging state of the saturable reactor under the operating conditions of the potting insulation material epoxy resin. In the 1970s, foreign countries began to study the insulation weakness detection and aging detection technology of epoxy resin materials, but mainly focused on their aging state under power frequency sinusoidal voltage. For the detection and research of epoxy resin insulation aging state under 50/60Hz power frequency, it mainly focuses on the evaluation research of means and methods. However, the research on the evaluation of the aging state of epoxy resin materials in the operating environment of saturated reactors was carried out relatively late in the industry, and there is no aging test and detection technology and corresponding equipment that can be widely used in engineering and industrial use. Due to the above reasons, the data and test standards for the research on the aging state of epoxy resin under the condition of new saturated reactors with high-frequency pulses are less accumulated, and there is a lack of relevant and operable test methods.

Contents of the invention

The object of the present invention is to provide a kind of saturable reactor insulation accelerated aging test device and test method, it is characterized in that, described saturated reactor insulation accelerated aging test device is that the temperature-resistant insulating bracket 8 is set at the lower part of the constant temperature oven 6, and the test product is potted The box is placed on a heat-resistant insulating support 8; a high-frequency pulse power supply is composed of a generator 1 and a power amplifier 2, and a protection resistor 3, a trigger current sensor 4 and a digital oscilloscope 5 are connected in series at the high-voltage output end of the power amplifier 2, and the protection resistor 3 and 1. The node of the trigger current sensor 4 is connected to the sample high-voltage electrode I, the ground terminal of the power amplifier 2 is connected to the sample ground electrode II, and the leakage current sensor 9 connected to the sample ground electrode II is connected to the digital oscilloscope 5 .

The test method for accelerated aging test of saturable reactor insulation is characterized in that the implementation steps include: preparing an aging insulation sample, combined electrothermal aging, collecting phenomenological data of the sample during and after aging, and testing the phenomenological data of the sample before aging. Dielectric and physical and chemical properties, aging state evaluation; details are as follows:

1) Sample preparation process

(1) Take the high-temperature curing epoxy resin raw material, according to the pouring procedure of general equipment manufacturing, mix the raw material components according to the 3MTMScotch-WeldTM two-component structural type 2216B/A epoxy resin potting glue, and mix B:A=2 according to the volume ratio: 3;

(2) Insert the sample high-voltage electrode Ⅰ and the sample ground electrode Ⅱ into the pre-customized potting box 7, so that the two electrodes are kept at a certain distance L=1.2mm, ±0.05mm;

(3) Pour the raw materials prepared in the above (1) into the potting box 7, and then place it in a pre-adjusted 120°C constant temperature oven 6 to cure for 2 hours, and then take it out;

(4) Clean the obtained potting epoxy resin sample in absolute ethanol, and then use ultrasonic cleaning to remove the influence of surface impurities, and dry the processed sample in a constant temperature oven 6 at a constant temperature of 50°C for 2 hours take out;

2) Electrothermal combined aging

(1) Connect the sample high-voltage electrode Ⅰ and the sample ground electrode Ⅱ of the sample potting box 7 to the high-voltage end and the ground electrode respectively, and place the sample potting box 7 in a temperature-resistant oven 6 as a whole. On the insulating support 8;

(2) Apply 10kV unipolar high-frequency pulse voltage to the sample, its frequency is 5kHz, the rising edge is 5μs, the temperature in the constant temperature oven 6 is set to 120°C, and the electrothermal combined aging test is carried out successively for 100h, 200h, and 300h Take out spare;

3) Phenomenological data analysis test

(1) data collection, obtain the real-time partial discharge pulse voltage signal and the trigger voltage signal on the ground connected to the sample in the aging process through the trigger current sensor 9;

(2) Data collection, the above-mentioned voltage signal is transmitted to a digital oscilloscope through a coaxial cable, and the discrete voltage data is transmitted to a computer through a USB protocol;

(3) data processing, computer 12 obtains real-time voltage signal from digital oscilloscope 5, and the real-time signal obtained is filtered;

(4) data storage, save the data of the implemented voltage signal through filtering in the database 11 to form historical voltage data for analysis and aging state analysis;

(5) data analysis, through the data processing system 10, analyze the historical voltage data of stored gain, extract partial discharge characteristic parameter, form phenomenological analysis atlas, analyze the insulation aging state of sample;

4) Dielectric and physical and chemical performance test test, broadband dielectric loss frequency spectrum test, using a broadband dielectric impedance analyzer to test the dielectric loss value of the sample when the frequency changes within the range of 5×10 ^-2 ~ 10 ³ Hz, and determine it as 1kV The test voltage is tested at 20°C and under vacuum conditions; the samples obtained at each stage of the aging test are tested separately, and the spectrum of dielectric impedance is obtained in the wide-frequency scanning range;

5) Fourier transform infrared spectroscopy, using an infrared spectrometer to analyze the sample. In the experiment, the aged potting sample was extracted from the surface insulation material to make a 50mm*50mm square sheet sample for infrared spectrum scanning. The experimental results were obtained by Read out by OPUS-Viewer software;

6) Aging state assessment

(1) Phenomenological judgment status evaluation

Through phenomenological data analysis, the phase distribution map of the maximum discharge capacity, the phase distribution map of the average discharge capacity, the phase distribution map of the discharge amplitude, and the phase distribution map of the number of discharges are obtained online, and the three-dimensional Φ-Q-N map is obtained with the above maps, of which:

The phase distribution spectrum of the maximum discharge capacity indicates the maximum discharge capacity of each part distributed in the entire phase interval;

The phase distribution map of the average discharge capacity represents the average discharge capacity of each part distributed in the entire phase interval;

The discharge amplitude distribution map represents the statistics of the number of discharges with different amplitudes;

The phase distribution spectrum of the number of discharges indicates the number of discharges distributed in each part of the entire phase interval;

This shows that the Φ-Q-N spectrum shows the relationship between the discharge amount, the number of discharges and the discharge phase. It is obvious from the above spectrum that as the aging time increases, the difference in the characteristic statistics of the spectrum gradually increases; it shows that the saturable reactor There is an obvious correlation between the discharge spectrum of the insulation sample and its aging degree; therefore, the phenomenological judgment obtained by collecting the leakage current data online can be used to evaluate the insulation aging state of the saturable reactor;

(2) Evaluation of dielectric and physical and chemical properties. Since the samples with different aging times have obvious differences in their broadband dielectric loss spectrum curves, as the aging time increases, the dielectric loss value of the samples increases in the entire spectrum, indicating that There is an obvious correlation between the dielectric loss and the degree of aging; therefore, the measurement of the dielectric loss spectrum can be used to evaluate the aging state of the saturable reactor insulation;

(3) In the infrared spectrum analysis of the test sample extracted from the surface of the saturable reactor potting insulation sample, it can be found that with the increase of aging time, the absorbance around a specific wave number will increase significantly, which is It means that there is also a clear correlation between the infrared spectrum of the reactor insulation sample and its aging degree; therefore, the measurement of the infrared spectrum can also be used to evaluate the aging state of the saturable reactor insulation.

The beneficial effect of the present invention is that the technical solution adopted to solve the technical problems is: to establish a new type of saturable reactor insulation accelerated aging test device for high-voltage direct current transmission converter valve parts, and to simulate the aging situation of the internal insulation of the new type of saturable reactor in actual operation . Evaluate the aging state of insulating materials by analyzing the changes in phenomenological parameters, dielectric and physical and chemical properties of insulating materials before and after accelerated aging and during the aging process, including characteristic quantities of partial discharge, broadband dielectric loss spectrum, and Fourier infrared spectroscopy . In a word, the method of the present invention is relatively simple to operate and easy to realize. And through the combined effects of phenomenological, dielectric and physical and chemical properties, the aging state of the saturable reactor insulation can be quickly and effectively evaluated.

Description of drawings

Figure 1 is the experimental platform for the combined aging of the insulation and heat of the saturable reactor.

Figure 2 is the sample model of the saturable reactor insulation test.

Figure 3 is the phase distribution spectrum of the maximum discharge capacity, where a) 100h, b) 200h, c) 300h.

Figure 4 is the average discharge capacity phase distribution spectrum, where a) 100h, b) 200h, c) 300h.

Figure 5 is the discharge amplitude distribution spectrum, where a) 100h, b) 200h, c) 300h.

Fig. 6 is the phase distribution spectrum of discharge times, in which a) 100h, b) 200h, c) 300h.

Figure 7 is the Φ-Q-N spectrum of the discharge of the saturable reactor insulation at different aging stages, where a) aging for 100h, b) aging for 200h, and c) aging for 300h.

Detailed ways

The invention provides a saturable reactor insulation accelerated aging test device and test method, which will be described below in conjunction with the accompanying drawings and embodiments.

In the experimental platform for the combined insulation and electric heating aging of the saturated reactor shown in Figure 1, the accelerated aging test device for the saturated reactor insulation is that the temperature-resistant insulating support 8 is set at the lower part of the constant temperature oven 6, and the test sample potting box is placed on the temperature-resistant insulating support 8 Above; a high-frequency pulse power supply composed of a generator 1 and a power amplifier 2, a protection resistor 3, a trigger current sensor 4 and a digital oscilloscope 5 are connected in series at the high-voltage output end of the power amplifier 2, and the nodes of the protection resistor 3 and the trigger current sensor 4 are connected to The sample high-voltage electrode I is connected, the ground terminal of the power amplifier 2 is connected to the sample ground electrode II, and the leakage current sensor 9 connected to the sample ground electrode II is connected to the digital oscilloscope 5 .

The test method for the accelerated aging test of the saturable reactor insulation is characterized in that the implementation steps include: preparing the aging insulation test sample, combined electric heating aging, collecting the phenomenological data of the test sample in the aging process and after aging, and testing the sample before aging The dielectric, physical and chemical properties, and aging state evaluation of the product; the details are as follows:

1) Sample preparation process

(1) Take the high-temperature curing epoxy resin raw material, according to the pouring procedure of general equipment manufacturing, mix the raw material components according to the 3MTMScotch-WeldTM two-component structural type 2216B/A epoxy resin potting glue, and mix B:A=2 according to the volume ratio: 3;

(2) Insert the sample high-voltage electrode I and the sample ground electrode II into the pre-customized potting box 7, so that the two electrodes are kept at a certain distance L=1.2mm, ±0.05mm (as shown in Figure 2);

(3) Pour the raw materials prepared in the above (1) into the potting box 7, and then place it in a pre-adjusted 120°C constant temperature oven 6 to cure for 2 hours, and then take it out;

(4) Clean the obtained potting epoxy resin sample in absolute ethanol, and then use ultrasonic cleaning to remove the influence of surface impurities, and dry the processed sample in a constant temperature oven 6 at a constant temperature of 50°C for 2 hours take out;

2) Electrothermal combined aging

(1) Connect the sample high-voltage electrode Ⅰ and the sample ground electrode Ⅱ of the sample potting box 7 to the high-voltage end and the ground electrode respectively, and place the sample potting box 7 in a temperature-resistant oven 6 as a whole. On the insulating support 8;

(2) Apply 10kV unipolar high-frequency pulse voltage to the sample, its frequency is 5kHz, the rising edge is 5μs, the temperature in the constant temperature oven 6 is set to 120°C, and the electrothermal combined aging test is carried out successively for 100h, 200h, and 300h Take out spare;

3) Phenomenological data analysis test

(1) data collection, obtain the real-time partial discharge pulse voltage signal and the trigger voltage signal on the ground connected to the sample in the aging process through the trigger current sensor 9;

(2) Data collection, the above-mentioned voltage signal is transmitted to a digital oscilloscope through a coaxial cable, and the discrete voltage data is transmitted to a computer through a USB protocol;

(3) data processing, computer 12 obtains real-time voltage signal from digital oscilloscope 5, and the real-time signal obtained is filtered;

(4) data storage, save the data of the implemented voltage signal through filtering in the database 11 to form historical voltage data for analysis and aging state analysis;

(5) data analysis, through the data processing system 10, analyze the historical voltage data of stored gain, extract partial discharge characteristic parameter, form phenomenological analysis atlas, analyze the insulation aging state of sample;

4) Dielectric and physical and chemical performance test test, broadband dielectric loss frequency spectrum test, using a broadband dielectric impedance analyzer to test the dielectric loss value of the sample when the frequency changes within the range of 5×10 ^-2 ~ 10 ³ Hz, and determine it as 1kV The test voltage was tested at 20°C under vacuum conditions; the samples obtained at each stage of the aging test were tested separately, and the spectrum of the dielectric impedance was obtained in a wide-frequency scanning range (as shown in Figure 3, where a) 100h, b) 200h, c) 300h);

5) Fourier transform infrared spectroscopy, using an infrared spectrometer to analyze the sample. In the experiment, the aged potting sample was extracted from the surface insulation material to make a 50mm*50mm square sheet sample for infrared spectrum scanning. The experimental results were obtained by Read out by OPUS-Viewer software (as shown in Figure 4, wherein a) 100h, b) 200h, c) 300h);

6) Aging state assessment

(1) Phenomenological judgment status evaluation

Through phenomenological data analysis, the maximum discharge capacity phase distribution spectrum, the average discharge capacity phase distribution spectrum, the discharge amplitude phase distribution spectrum, the discharge frequency phase distribution spectrum and the Φ-Q-N spectrum are obtained online (as shown in Figure 5, where a) 100h , b) 200h, c) 300h); where:

The phase distribution spectrum of the maximum discharge capacity indicates the maximum discharge capacity of each part distributed in the entire phase interval;

The phase distribution spectrum of the average discharge capacity represents the average discharge capacity of each part distributed in the entire phase interval (as shown in Figure 7 where a) aging 100h, b) aging 200h, c) aging 300h);

The discharge amplitude distribution map represents the statistics of the number of discharges with different amplitudes;

The phase distribution spectrum of the number of discharges indicates the number of discharges distributed in each part of the entire phase interval;

This shows that the Φ-Q-N spectrum represents the relationship between the discharge amount, the number of discharges and the discharge phase. It is obvious from the above spectrum that the difference in the characteristic statistics of the spectrum increases gradually with the increase of the aging time;

It shows that there is an obvious correlation between the discharge spectrum of the saturable reactor insulation sample and its aging degree; therefore, the phenomenological judgment obtained by collecting leakage current data online can be used to evaluate the aging state of the saturable reactor insulation;

(2) Evaluation of dielectric and physical and chemical properties. Since the samples with different aging times have obvious differences in their broadband dielectric loss spectrum curves, as the aging time increases, the dielectric loss value of the samples increases in the entire spectrum, indicating that There is an obvious correlation between the dielectric loss and the degree of aging; therefore, the measurement of the dielectric loss spectrum can be used to evaluate the insulation aging state of the saturable reactor (as shown in Figure 3);

(3) In the infrared spectrum analysis of the test sample extracted from the surface of the saturable reactor potting insulation sample (as shown in Figure 4), it can be found that with the increase of aging time, there will be obvious differences in the absorbance near a specific wave number This means that there is a clear correlation between the infrared spectrum of the reactor insulation sample and its aging degree, so the measurement of the infrared spectrum can also be used to evaluate the aging state of the saturable reactor insulation.

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.