Recently, the high -voltage transmission and transformer technology and equipment team published a study review article in the first Journal of Electrical Discipline"Research on the Study on Pulse Voltage Power Electronic Equipment Insulation Change"。

Through the rightHigh -voltage electric electronic equipmentThe exposition of the influence mechanism of insulation breakdown and flash connection, revealsUnder the pulse electric fieldcharge behavior against insulationLise10587_10592，Elaborate research progress of pulse voltage parameters on the characteristics of charge characteristics，and summarized and discussed the lack of current research。The summary of these research results will provide reference and theoretical guidance for the optimized design of the pulse voltage and the optimized design of the insulation material and system。

M88 Online Live Casino

With the development of UHV DC transmission and the expansion of the scale of new energy power generation，High pressurePower electronic devices and equipment occupy an increasingly important position in the power system。Electric electronics equipment for a long time is at high frequency、Under the operating conditions of the voltage of the steely pulse，Its insulation system is prone to early failure，Threat the safety and reliability of the operation of the power system。Where，Space charge dynamic behavior is under the pulse electric fieldElectricInsulationEarlyAn important cause of failure. therefore,Design solution for optimized insulating material、Improve the reliability of power electronic equipment，Explore high -frequency pulsevoltageThe characteristics of the behavior and the mechanism of insulation and degradation are important。

2. The main points of the review

（1) Electric electronics equipment to withstand pulse voltage work conditions

The turnover and control of the switch device cause M88 games apkvoltage mutations，Will in the device itself、Electric electronics equipment and connected equipment generate high frequency、The pulse voltage and current of steep rising edges。At the same time，pulse width modulation technology (Pulse Width Modulation, PWM) Wide application，Makes modern power electronic equipment bearing a rapid rise and falling edge、Fang wave pulse voltage with higher amplitude and repeated frequency。As shown in Figure1shown in, high frequency changePressureer、Flowing transformer valve side sleeve、High -voltage electric electronic devices all bear high -frequency pulse voltage effects。

Figure1 Common power electronic equipment and devices to withstand voltage waveforms

（2) Pulse voltage down the relationship between electrical insulation characteristics and charge behavior

Research Digital, compared to DC and AC voltage of the same amplitude value,pulse voltageElectrical insulation breakdown life is severely shortened、The start voltage of electro -branches has dropped sharply (as shown in Figure2shown)，The surface discharge of the qi -solid insulation interface is even more intense、A decrease in flash connection voltage。Electric branches characteristics through the pulse voltage、Summary of research status of surface discharge and glitter characteristics，Clarifying the relationship between the characteristics of charge behavior and electrical insulation characteristics。

(A) Sinusut and Fang waves to resist the life of the dizziness       (b) sine sine and square waveThe start voltage of the electrical branch under the voltage

Figure2 Comparison of insulation characteristics under the voltage of sine and pulse square wave voltage

①Start of electro -branches、breakdown and other characteristics mainly depends on space charge behavior。Pulse Electric Farm accelerated charge obtaining kinetic energy，Molecular chain of impact materials，Treatment of ionization and production of electro -branches; other than that，Under the incentive effect of pulse voltage, it will cause caught charge in attaches，If the time to fall is less than the relaxation time of the M88 Online Live Casinomaterial，The release of the energy released will cause chemical bonds to destroy and cause electro -branches。

② The accumulation of surface charge increases the probability of initial electrons，Promoting the formation and development of electronic collapse，Helps to form a discharge and flash in the face. also,Quickly change the electric field to generate a larger magnetic field，Increases the charge of the charge Lorezl，Make the charge get higher energy，The collision of high -energy electrons exacerbated the damage to the insulation micro structure，Causes the starting and flashing of the electrical branches。

（3) Research Statue of the Character characteristics of pulse voltage under voltage

The effects of different pulse parameters on the characteristics of the internal space charges of the materialNo unified and reasonable theoretical interpretation has not yet been formed，It is also necessary to obtain a more commonly applicable overall law and clarify the differences between different insulating materials，Then provide theoretical guidance for the improvement of insulation materials。Most studies only pay attention to the charging stable characteristics of the high level of the square wave voltage and the constant level of the low -level voltage，Dynamic behavior of lack of pulse edges charged at all times of charge。Compared with the pulse voltage, the charge steady state characteristics，The dynamic behavior of the charging along the edge of the pulse edge is more serious for damage to insulation。But，Studies specifically lacking on the research on the dynamic characteristics of the space charging along the rising and declined.，Urgently needs to explore the relevant characteristics and explain its internal mechanism。

As the pulse frequency increases、Short up the rise、Increased duty cycle，Surface charge accumulation increase。Pulse voltage causes the surface charge polarity after flashing the surface of the surface，The distortion effect on the surface electric field is more serious，Accelerated insulation surface aging。but，Most of the measurement methods with mature surface charge are offline，New testing methods that can monitor m88 sports bettingthe changes in surface charges in real time。

（4) The dynamic characteristics of the pulse edge at the time of charge

Due to the restrictions of repeated frequency of charge testing technology，It is difficult to achieve microsecond level or even nanosecond -level charges quickly repeat test，Can't directly obtain the charge dynamic behavior at the moment of the pulse edge，It restricts the development of the research on the characteristics of the insulation characteristics of pulse voltage。The author's research groupPutting the idea of ​​comparing the comparison of charging distribution through the pulse edges，indirectly pushing the charging behavior at the time of the pulse，Develop pulseTriggerControl circuit,Makes the charge test time with the rising edge and decline, which is accurately matched,ThroughAscend、Data comparison data comparison of the charging data of the decrease along the front and rear charges。PreliminaryDiscoverPulse edge edge of the space charging phenomenon，Analysis of this phenomenon based on the theory of charge -based analysis theory。Simplify the stress of space charges in the solid medium into electric field power and"Material Stress" two categories，angle of the break from the charge of charge，Analysis and discussion on the charging behavior at the edge of the pulse edge。

3. Main research conclusions and prospects

①pulse voltage down the electronic electronic equipment insulation is easy to occur early，Among them, charge characteristics and dynamic behavior are important incentives。The changes in pulse voltage parameters have changed the movement and accumulation characteristics of spatial charge and surface charge，Then it affects the performance and life of insulation electrical。

② Change the charged state mutation of pulse edges，Release energy through infection、High -energy electronic impact and Lorentz force，Adver the destruction of the insulation structure，Therefore, the research of dynamic changes in the charging of pulse time is particularly important。pulse voltage rises、The change in the charge caused by the mutation of the electric field with the power farms at the decline is caused by the failure of the charge、Infusion、m88 com live casino registerMigration and other behaviors important reasons。

③With nitride(GAN)silicon carbide(SIC)The development of equivalent wide -band semiconductor materials，The progress of the switching device will generate a higher frequency、The steep sloping pulse voltage，In the future, it should be explored to adapt to high frequency、Tall pulse voltage down charge testing technology，From experimental phenomena、In -depth exploration of physical laws and numerical simulation，Fundamentally expose the mechanism of early failure of the pulse voltage and the early failure。

Associate Professor He Dongxin is the first author of this article，The person in charge of the team Professor Li Qingquan is the author of the communication，Team graduate Zhang Tao as the second author，This research work has received the National Natural Science Foundation of China、Funding from the Shandong Natural Science Foundation。

Cited this article:

He Dongxin,Zhang Tao,Chen Xiaoguang,Gong Wenjie,Li Qingquan.Pulse voltage down power electronic equipment insulation charge characteristics Study review[j].Journal of Electrician Technology, 2021, 36 (22): 4795-4808. He dongxin, zhang Tao, Chen xiaoguang, gong wenjie, Li Qingquan. Research Overview on Charge Characteristics of Power Electronic Equipment Insulation Under The Pulse Voltage [J]. Transactions of China Electrotechnical Society, 2021, 36 (22): 4795-4808.

Doi：10.19595/j.cNKI.1000-6753.Tcess.210266