CN104155528A - Method for testing transformer oil paper insulation frequency domain dielectric response and device thereof - Google Patents
Method for testing transformer oil paper insulation frequency domain dielectric response and device thereof Download PDFInfo
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- CN104155528A CN104155528A CN201410410025.9A CN201410410025A CN104155528A CN 104155528 A CN104155528 A CN 104155528A CN 201410410025 A CN201410410025 A CN 201410410025A CN 104155528 A CN104155528 A CN 104155528A
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Abstract
The invention discloses a method for testing transformer oil paper insulation frequency domain dielectric response and a device thereof. The device comprises a variable frequency signal generator (1), a signal conditioning module (3), a signal acquisition module (8) and a processing module (11). The signal output end of the variable frequency signal generator (1) is connected to the input end of a tested transformer (2). The output end of the tested transformer (2) is connected to the receiving end of the signal conditioning module (3) and the receiving end of the signal acquisition module (8). The method and the device have the advantages that the operation is simple, the measurement precision is high, the anti-interference ability is strong, the measurement result information is rich, the measurement of transformer oil paper insulation frequency domain dielectric response can be completed in a complex field environment, the cost is low, the method and the device can be widely popularized and applied in a domestic power system, the transformer oil paper insulation aging state assessment and fault diagnosis are improved further, and the method and the device have an important meaning to the reliable operation of the power system.
Description
Technical field
The present invention relates to a kind of proving installation and method of dielectric response, particularly relate to a kind of method and device of testing transformer oil paper insulation frequency domain dielectric response.
Background technology
Oil-immersed power transformer is as the nucleus equipment of energy conversion in electric system and transmission, and its safety, reliability service have decisive meaning for the stable supply of electric power.Most of power transformer is usingd the major insulation system of paper oil insulation as its inside, in actual moving process, Oil-Paper Insulation is owing to being subject to the effect of electricity, heat, chemistry, mechanical equal stress and aging gradually, the aging power supply that may cause transformer fault when serious and even affect whole electrical network.For the power transformer in aging early stage, need to take effective maintenance measure to extend its serviceable life; For the power transformer in aging mid-term, need to take timely and effectively maintenance measure to eliminate potential faults; For the power transformer in aging later stage, need to change to avoid the generation of fault in time.In view of economical and technical consideration, need badly Research on Power Transformer Oil-paper Insulation ageing state and residual life in using are carried out to accurate evaluation, thereby instruct the operation maintenance management of transformer in actual motion, support equipment safe operation.Characteristic parameter One's name is legion that can Efficient Evaluation transformer oil paper insulation ageing state, wherein traditional characteristic parameter comprises the insulating paper degree of polymerization, tensile strength, moisture and Dissolved Gases in Insulating Oil content, furfural content, acid number etc., but obtaining these characteristic parameters need to sample and experience the loaded down with trivial details chemical measurement process of series of complex transformer oil paper insulation, not only can cause damage to the transformer inner structure in actual motion, and operating difficulties, cannot to transformer oil paper insulation ageing state, carry out accurate evaluation in time.
In recent years, the dielectric response theory of take has been subject to researcher's extensive concern as basic Transformer Insulation Aging state Nondestructive technology, comprising return voltage method (RVM) and polarization depolarization current method (PDC).Return voltage method (RVM) is to utilize the polarization characteristic of solid material under DC voltage, obtain its return voltage curve and parameter, relation by correlation parameter and water cut and degree of aging etc. judges solid insulation ageing situation, but return voltage method can only judge the whole ageing state of paper oil insulation.Polarization depolarization current method (PDC) is by applying the DC voltage of certain amplitude at insulation sample two ends, sample can produce polarization current due to polarization characteristic, short circuit sample after connection certain hour, and the electric current that flows through sample turns to suddenly, produces depolarization current.By the analysis depolarization current curve that polarizes, can judge respectively the ageing state of insulating oil and insulating paper, but polarization current is difficult to accurately record, and is subject to external interference.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of method and device of testing transformer oil paper insulation frequency domain dielectric response is provided, solve existing transformer oil paper insulation method of testing, can only the test oil paper insulation whole ageing state of return voltage method wherein, there is the not comprehensive defect of test, and depolarization current method is easily subject to external interference, make to test inaccurate shortcoming.
Object of the present invention is achieved through the following technical solutions: a kind of device of testing transformer oil paper insulation frequency domain dielectric response, comprise frequency variation signal generator, signal condition module, signal acquisition module and processing module, the signal output part of described frequency variation signal generator is connected to the input end of tested transformer, the output terminal of tested transformer is connected to the receiving end of signal condition module and the receiving end of signal acquisition module, the output of signal condition module is also connected to the receiving end of signal acquisition module, the output of signal acquisition module connects processing module, the control end of frequency variation signal generator is also connected in processing module.In this device, the effect of processing module, the one, control the output of frequency variation signal generator, the 2nd, by the information of receiving, calculate paper oil insulation telegram in reply in tested transformer and hold and dielectric dissipation factor, staff, by the data that calculate, judges the aging performance of tested transformer, signal-adjusting module is mainly that the signal of tested transformer is regulated, mainly contain the effect of filter and amplification, signal acquisition module is to gather the signal that storage is received, then sends to processing module.The output of survey transformer of the present invention will output to respectively signal condition module and signal acquisition module, and whether checking enlargement factor is consistent, avoids larger error.
Further, above-mentioned signal condition module comprises current amplifier, low-pass filter, rejection filter and the voltage amplifier connecting successively, and current amplifier is connected to the output of tested transformer, and voltage amplifier is connected to signal acquisition module.
Further, above-mentioned signal acquisition module comprises A/D converter and single-chip microcomputer, and the output of described A/D converter is connected to single-chip microcomputer, and the output of single-chip microcomputer is connected to processing module.A/D converter is converted to digital signal by simulating signal, facilitates Storage and Processing.
A method of testing transformer oil paper insulation frequency domain dielectric response, comprises the following steps:
(1) tested transformer is the power transformer of a stoppage in transit, the three-phase of its high-pressure side and low pressure end is connected in parallel respectively, as need the paper oil insulation frequency domain dielectric response characteristic between testing high voltage end and low pressure end, the input end of tested transformer, output terminal are respectively its high-pressure side, low pressure end; As need test low pressure end paper oil insulation frequency domain dielectric response characteristic over the ground, the input end of tested transformer, output terminal are respectively its low pressure end, earth terminal; As need testing high voltage end paper oil insulation frequency domain dielectric response characteristic over the ground, the input end of tested transformer, output terminal are respectively its high-pressure side, earth terminal;
(2) after wiring, frequency variation signal generator is controlled to tested transformer output voltage signal by processing module, and the amplitude range of this voltage signal is 0 ~ 200V, and frequency range is 10
-3~ 10
3hz, tested transformer is to signal-adjusting module and signal acquisition module difference output current signal, and the amplitude of this current signal is 10
-12a ~ 10
-6a, first this current signal is amplified by current amplifier, be converted into voltage signal, by low-pass filter, rejection filter filtering, processed again, then by voltage amplifier amplifying signal again, then send to signal acquisition module, signal acquisition module can receive two signals, one is the current signal that tested transformer directly sends, one is the voltage signal after this current signal is processed by signal-adjusting module in addition, A/D converter is converted to digital signal by the simulating signal receiving, and then by single-chip microcomputer, is collected signal and is sent to processing module;
(3) processing module is processed digital signal, thereby calculates telegram in reply appearance and the dielectric dissipation factor of tested transformer.
Further, above-mentioned tested transformer input voltage signal U and output current signal I meet following relation:
In formula, C and G are respectively the paper insulated electric capacity of tested transformer oil and electricity is led, C
0for vacuum electric capacity, ε * is complex permittivity, the real part that wherein ε ' is complex permittivity, the polarizability of sign insulating material, i.e. relative dielectric constant; ε ' ' is the imaginary part of complex permittivity, characterizes the dielectric loss of insulating material, and described telegram in reply holds
, the real part that wherein the paper insulated capacitor C of transformer oil is held for telegram in reply, transformer oil paper insulation electricity is led the ratio with angular frequency
imaginary part for telegram in reply appearance; The value of input voltage signal U is known, and output current signal I detects, and is all known, can obtain telegram in reply and hold, then can obtain dielectric dissipation factor according to the ratio of telegram in reply appearance imaginary part and real part.
The relation of described dielectric dissipation factor tan δ and complex permittivity (or telegram in reply holds) is as follows:
。
Staff utilizes dielectric telegram in reply appearance, complex permittivity ε * and dielectric dissipation factor tan δ under low pressure sinusoidal alternating electric field, with frequency change, to assess the ageing state of insulating material.
The invention has the beneficial effects as follows: method of testing of the present invention and install simple to operate, measuring accuracy is high, antijamming capability is strong, measurement result abundant information, can in complicated site environment, complete the surveying work of transformer oil paper insulation frequency domain dielectric response characteristic, and method of testing of the present invention and installation cost are cheap, in electric system, be widely applied at home, further improve transformer oil Aging of Oil-paper Insulation in Oil state estimation and fault diagnosis, significant to electric system reliability service.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is on-the-spot test wiring diagram of the present invention;
Fig. 3 is the ultimate principle figure of method of testing;
Fig. 4 is test flow chart of the present invention;
Fig. 5 is the change curve schematic diagram of tested transformer dielectric dissipation factor;
Fig. 6 is the change curve schematic diagram that tested transformer telegram in reply holds real part;
Fig. 7 is the change curve schematic diagram that tested transformer telegram in reply holds imaginary part;
In figure, 1-frequency variation signal generator, the tested transformer of 2-, 3-signal condition module, 4-current amplifier, 5-low-pass filter, 6-rejection filter, 7-voltage amplifier, 8-signal acquisition module, 9-A/D converter, 10-single-chip microcomputer, 11-processing module.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples:
As Fig. 1, shown in 2, a kind of device of testing transformer oil paper insulation frequency domain dielectric response, comprise frequency variation signal generator 1, signal condition module 3, signal acquisition module 8 and processing module 11, the signal output part of described frequency variation signal generator 1 is connected to the input end of tested transformer 2, the output terminal of tested transformer 2 is connected to the receiving end of signal condition module 3 and the receiving end of signal acquisition module 8, the output of signal condition module 3 is also connected to the receiving end of signal acquisition module 8, the output of signal acquisition module 8 connects processing module 11, the control end of frequency variation signal generator 1 is also connected in processing module 11.Signal condition module 3 comprises current amplifier 4, low-pass filter 5, rejection filter 6 and the voltage amplifier 7 connecting successively, and current amplifier 4 is connected to the output of tested transformer 2, and voltage amplifier 7 is connected to signal acquisition module 8.Signal acquisition module 8 comprises A/D converter 9 and single-chip microcomputer 10, and the input of described A/D converter 9 connects respectively signal condition module 8 and tested transformer 2, and its output is connected to single-chip microcomputer 10, and the output of single-chip microcomputer 10 is connected to processing module 11.
In this device, current amplifier 4 adopts OPA128 low noise amplifier, it has the feature of low maladjustment voltage, low temperature drift, high input impedance and high cmrr, can convert the low current signal by tested sample to voltage signal, and amplifies certain multiple; Low-pass filter 5 is selected the active second-order low-pass filter of Butterworth, specifically uses OP37 as filtering circuit amplifier, effectively high frequency noise and the interference in filtering voltage signal; Rejection filter 6 is selected the mode of notch filter, adopts two OP37 as amplifier in trap circuit, can effectively filtering power frequency (50Hz) Noise and Interference; Voltage amplifier 7 adopts OPA128 as amplifying circuit amplifier, and its enlargement factor is adjustable, according to actual conditions, the voltage signal amplitude through front tertiary treatment is further amplified to 0 ~ 5V, is convenient to follow-up Treatment Analysis.
As shown in Figure 3, there is not desirable insulator in the ultimate principle of method of testing of the present invention and device, so dielectric character can be described with the equivalent electrical circuit of electric capacity and resistance parallel connection in reality in reality.Under the effect of simple alternating current electric field, the lag-effect generation loss that the inner meeting of dielectric is led and polarized because of electricity.Complex permittivity or telegram in reply hold the degree that can characterize dielectric polarization and loss in macroscopic view.When applying sinusoidal voltage at dielectric two ends, by dielectric electric current and voltage, have certain big or small phase differential, this angle is exactly dielectric dielectric loss angle δ, and the tangent value of dielectric loss angle is exactly dielectric dielectric dissipation factor tan δ.
The experiment process of method of testing of the present invention and device as shown in Figure 4, comprises measurement circuit connection, initial parameter setting, communicates to connect, starts to test, tests end, data analysis and processing, test result preservation.Detailed process step is as follows:
(1) tested transformer 2 is the power transformer of a stoppage in transit, the three-phase of its high-pressure side and low pressure end is connected in parallel respectively, as need the paper oil insulation frequency domain dielectric response characteristic between testing high voltage end and low pressure end, the input end of tested transformer 2, output terminal are respectively its high-pressure side, low pressure end; As need test low pressure end paper oil insulation frequency domain dielectric response characteristic over the ground, the input end of tested transformer, output terminal are respectively its low pressure end, earth terminal; As need testing high voltage end paper oil insulation frequency domain dielectric response characteristic over the ground, the input end of tested transformer, output terminal are respectively its high-pressure side, earth terminal;
(2) after wiring, frequency variation signal generator 1 is controlled to tested transformer 2 output voltage signals by processing module 11, and the amplitude range of this voltage signal is 0 ~ 200V, and frequency range is 10
-3~ 10
3hz, tested transformer 2 is to signal-adjusting module 3 and signal acquisition module 8 difference output current signals, and the amplitude of this current signal is 10
-12a ~ 10
-6a, first this current signal is amplified by current amplifier 4, be converted into voltage signal, again by low-pass filter 5, rejection filter 6 filtering are processed, then by voltage amplifier amplifying signal again, then send to signal acquisition module 8, signal acquisition module 8 can receive two signals, one is the current signal that tested transformer 2 directly sends, one is the voltage signal after this current signal is processed by signal-adjusting module 3 in addition, A/D converter 9 is converted to digital signal by the simulating signal receiving, then by single-chip microcomputer 10, collect signal and send to processing module 11,
(3) 11 pairs of digital signals of processing module are processed, thereby calculate telegram in reply appearance and the dielectric dissipation factor of tested transformer 2.
Tested transformer input voltage signal U and output current signal I meet following relation:
In formula, C and G are respectively the paper insulated electric capacity of tested transformer oil and electricity is led, C
0for vacuum electric capacity, ε * is complex permittivity, the real part that wherein ε ' is complex permittivity, the polarizability of sign insulating material, i.e. relative dielectric constant; ε ' ' is the imaginary part of complex permittivity, characterizes the dielectric loss of insulating material, and described telegram in reply appearance is
, the real part that wherein the paper insulated capacitor C of transformer oil is held for telegram in reply, transformer oil paper insulation electricity is led the ratio with angular frequency
imaginary part for telegram in reply appearance; The value of input voltage signal U is known, and output current signal I detects, and is all known, can obtain telegram in reply and hold, then can obtain dielectric dissipation factor according to the ratio of telegram in reply appearance imaginary part and real part.
The relation of described dielectric dissipation factor tan δ and complex permittivity (or telegram in reply holds) is as follows:
。
The analyzing and processing of voltage and current signal realizes by the Labview programming in processing module 11, wherein key is asking for of the two phase differential, adopts Fast Fourier Transform (FFT) to guarantee can not lose the important information in test findings in data processing and analysis in method of testing of the present invention and device.
The test result of proving installation of the present invention is as Fig. 5-7, and wherein Fig. 5 is dielectric dissipation factor, and Fig. 6 is telegram in reply appearance real part, and Fig. 7 sends a telegram in reply to hold imaginary part.As can be seen from the figure, the telegram in reply that the transformer oil paper insulation frequency domain dielectric response family curve that utilizes proving installation test of the present invention to obtain has comprised under a plurality of frequencies holds and dielectric dissipation factor, for transformer oil Aging of Oil-paper Insulation in Oil state estimation and fault diagnosis provide true and reliable and abundant data, therefore can in electric system, further apply.
Claims (5)
1. a device of testing transformer oil paper insulation frequency domain dielectric response, it is characterized in that, comprise frequency variation signal generator (1), signal condition module (3), signal acquisition module (8) and processing module (11), the signal output part of described frequency variation signal generator (1) is connected to the input end of tested transformer (2), the output terminal of tested transformer (2) is connected to the receiving end of signal condition module (3) and the receiving end of signal acquisition module (8), the output of signal condition module (3) is also connected to the receiving end of signal acquisition module (8), the output of signal acquisition module (8) connects processing module (11), the control end of frequency variation signal generator (1) is also connected in processing module (11).
2. a kind of device of testing transformer oil paper insulation frequency domain dielectric response according to claim 1, it is characterized in that, described signal condition module (3) comprises current amplifier (4), low-pass filter (5), rejection filter (6) and the voltage amplifier (7) connecting successively, current amplifier (4) is connected to the output of tested transformer (2), and voltage amplifier (7) is connected to signal acquisition module (8).
3. a kind of device of testing transformer oil paper insulation frequency domain dielectric response according to claim 1 and 2, it is characterized in that, described signal acquisition module (8) comprises A/D converter (9) and single-chip microcomputer (10), described A/D converter (9) output is connected to single-chip microcomputer (10), and the output of single-chip microcomputer (10) is connected to processing module (11).
4. a method of testing transformer oil paper insulation frequency domain dielectric response, is characterized in that, comprises the following steps:
(1) tested transformer (2) is the power transformer of a stoppage in transit, the three-phase of its high-pressure side and low pressure end is connected in parallel respectively, as need the paper oil insulation frequency domain dielectric response characteristic between testing high voltage end and low pressure end, the input end of tested transformer (2), output terminal are respectively its high-pressure side, low pressure end; As need test low pressure end paper oil insulation frequency domain dielectric response characteristic over the ground, the input end of tested transformer, output terminal are respectively its low pressure end, earth terminal; As need testing high voltage end paper oil insulation frequency domain dielectric response characteristic over the ground, the input end of tested transformer, output terminal are respectively its high-pressure side, earth terminal;
(2) after wiring, frequency variation signal generator (1) is controlled to tested transformer (2) output voltage signal by processing module (11), and the amplitude range of this voltage signal is 0 ~ 200V, and frequency range is 10
-3~ 10
3hz, tested transformer (2) is to signal-adjusting module (3) and signal acquisition module (8) difference output current signal, and the amplitude of this current signal is 10
-12a ~ 10
-6a, first this current signal is amplified by current amplifier (4), be converted into voltage signal, again by low-pass filter (5), rejection filter (6) filtering is processed, then by voltage amplifier amplifying signal again, then send to signal acquisition module (8), signal acquisition module (8) can receive two signals, one is the current signal that tested transformer (2) directly sends, one is the voltage signal after this current signal is processed by signal-adjusting module (3) in addition, A/D converter (9) is converted to digital signal by the simulating signal receiving, then by single-chip microcomputer (10), collect signal and send to processing module (11),
(3) processing module (11) is processed digital signal, thereby calculates telegram in reply appearance and the dielectric dissipation factor of tested transformer (2).
5. a kind of method of testing transformer oil paper insulation frequency domain dielectric response according to claim 4, is characterized in that, described tested transformer input voltage signal U and output current signal I meet following relation:
In formula, C and G are respectively the paper insulated electric capacity of tested transformer oil and electricity is led, C
0for vacuum electric capacity, ε * is complex permittivity, the real part that wherein ε ' is complex permittivity, the polarizability of sign insulating material, i.e. relative dielectric constant; ε ' ' is the imaginary part of complex permittivity, characterizes the dielectric loss of insulating material, and described telegram in reply holds
, the real part that wherein the paper insulated capacitor C of transformer oil is held for telegram in reply, transformer oil paper insulation electricity is led the ratio with angular frequency
imaginary part for telegram in reply appearance;
Described dielectric dissipation factor tan δ is as follows with the relation that telegram in reply holds:
。
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| CN105158655A (en) * | 2015-08-24 | 2015-12-16 | 江苏大学 | Frequency-domain dielectric theory-based evaluation method for evaluating insulation aging state of oiled paper of transformer |
| CN107561418A (en) * | 2017-08-15 | 2018-01-09 | 华北电力大学 | A kind of dielectric response live line measurement device of power transformer, bushing installation |
| CN107607837A (en) * | 2017-08-18 | 2018-01-19 | 四川大学 | A kind of cable insulation degree of aging method of testing and device based on surge voltage |
| CN107621575A (en) * | 2017-08-25 | 2018-01-23 | 西南交通大学 | A kind of dielectric properties experimental method of tractive transformer insulating materials |
| CN107941862A (en) * | 2017-10-17 | 2018-04-20 | 广西电网有限责任公司电力科学研究院 | A kind of transformer oil Aging of Oil-paper Insulation in Oil diagnostic system based on frequency domain dielectric response |
| CN108279284A (en) * | 2018-01-04 | 2018-07-13 | 国网辽宁省电力有限公司电力科学研究院 | A kind of transformer moisture tester |
| CN108593714A (en) * | 2018-04-12 | 2018-09-28 | 西安交通大学 | Line measuring system for moisture content in a kind of transformer based on transformer built-in paper oil insulation sample effect of electromagnetic field |
| CN108593722A (en) * | 2018-04-04 | 2018-09-28 | 国网天津市电力公司电力科学研究院 | Transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method |
| CN108828413A (en) * | 2018-04-04 | 2018-11-16 | 国网天津市电力公司电力科学研究院 | Transformer insulated cardboard aging quantitative evaluating method based on effect of electromagnetic field |
| CN109239546A (en) * | 2018-08-28 | 2019-01-18 | 西南交通大学 | A kind of transformer insulated life prediction and reliability estimation method |
| CN111208397A (en) * | 2020-02-28 | 2020-05-29 | 重庆大学 | System and method for measuring high-voltage time/frequency domain dielectric response characteristics of power equipment |
| CN111352056A (en) * | 2018-12-21 | 2020-06-30 | 核动力运行研究所 | Temperature correction device and method for polarization and depolarization current test |
| CN112067900A (en) * | 2020-08-31 | 2020-12-11 | 广东电网有限责任公司广州供电局 | PDC time-frequency domain conversion method and device |
| CN113848390A (en) * | 2021-09-27 | 2021-12-28 | 广西电网有限责任公司电力科学研究院 | Smoothing method for frequency domain dielectric response test curve |
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| CN105158655A (en) * | 2015-08-24 | 2015-12-16 | 江苏大学 | Frequency-domain dielectric theory-based evaluation method for evaluating insulation aging state of oiled paper of transformer |
| CN107561418A (en) * | 2017-08-15 | 2018-01-09 | 华北电力大学 | A kind of dielectric response live line measurement device of power transformer, bushing installation |
| CN107607837A (en) * | 2017-08-18 | 2018-01-19 | 四川大学 | A kind of cable insulation degree of aging method of testing and device based on surge voltage |
| CN107607837B (en) * | 2017-08-18 | 2020-09-15 | 四川大学 | Cable insulation aging degree testing method and device based on impulse voltage |
| CN107621575A (en) * | 2017-08-25 | 2018-01-23 | 西南交通大学 | A kind of dielectric properties experimental method of tractive transformer insulating materials |
| CN107941862A (en) * | 2017-10-17 | 2018-04-20 | 广西电网有限责任公司电力科学研究院 | A kind of transformer oil Aging of Oil-paper Insulation in Oil diagnostic system based on frequency domain dielectric response |
| CN108279284A (en) * | 2018-01-04 | 2018-07-13 | 国网辽宁省电力有限公司电力科学研究院 | A kind of transformer moisture tester |
| CN108828413A (en) * | 2018-04-04 | 2018-11-16 | 国网天津市电力公司电力科学研究院 | Transformer insulated cardboard aging quantitative evaluating method based on effect of electromagnetic field |
| CN108593722A (en) * | 2018-04-04 | 2018-09-28 | 国网天津市电力公司电力科学研究院 | Transformer insulated cardboard based on effect of electromagnetic field makes moist quantitative evaluating method |
| CN108828413B (en) * | 2018-04-04 | 2020-12-11 | 国网天津市电力公司电力科学研究院 | Quantitative evaluation method for aging of transformer insulating paperboard based on dielectric response characteristic |
| CN108593714A (en) * | 2018-04-12 | 2018-09-28 | 西安交通大学 | Line measuring system for moisture content in a kind of transformer based on transformer built-in paper oil insulation sample effect of electromagnetic field |
| CN109239546A (en) * | 2018-08-28 | 2019-01-18 | 西南交通大学 | A kind of transformer insulated life prediction and reliability estimation method |
| CN109239546B (en) * | 2018-08-28 | 2020-05-22 | 西南交通大学 | Transformer insulation life prediction and reliability test method |
| CN111352056A (en) * | 2018-12-21 | 2020-06-30 | 核动力运行研究所 | Temperature correction device and method for polarization and depolarization current test |
| CN111208397A (en) * | 2020-02-28 | 2020-05-29 | 重庆大学 | System and method for measuring high-voltage time/frequency domain dielectric response characteristics of power equipment |
| CN112067900A (en) * | 2020-08-31 | 2020-12-11 | 广东电网有限责任公司广州供电局 | PDC time-frequency domain conversion method and device |
| CN113848390A (en) * | 2021-09-27 | 2021-12-28 | 广西电网有限责任公司电力科学研究院 | Smoothing method for frequency domain dielectric response test curve |
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Application publication date: 20141119 |
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