3:00 pm on June 2, 2021，The first PowerX Talks graduate academic thought forum sponsored by the Academic Science and Technology Innovation Center of the School of Electrical Engineering was held in the lecture hall on the fourth floor of the Electric Power Building on Qianfoshan Campus。This forum invites Wei Mingjie, a 2018 doctoral student from the School of Electrical Engineering, to give a lecture，The theme of the speech is "Distribution network high-resistance fault diagnosis technology and application based on wide-band synchronous measurement"。Song Sili, deputy secretary of the Party Committee of the School of Electrical Engineering, attended this forum and delivered a speech，This forum is hosted by Zang Lindong。

This speech，Wei Mingjie mainly introduces from the background、System parameter monitoring and high-resistance fault detection based on synchronized phasor、High-resistance fault line selection and section positioning based on broadband synchronization signal、Summary and outlook expanded into four parts，Introduced in detail his scientific research achievements in high resistance fault diagnosis。First，Wei Mingjie said that high-resistance faults are generally caused by single-phase ground faults with high transition resistance in medium-voltage distribution networks，And explained in detail1996 IEEE PSRC at 12.Current and transition resistance of various grounding media defined in 5kV distribution network，And the experimental verification done by their research team，At the same time, he also introduced the two mainstream medium-voltage distribution network structures in the world，And it is clear that the scope of his research on high resistance fault diagnosis is in the three-phase three-wire system，Because its zero-sequence network can achieve the isolation of medium and low voltage distribution networks to a certain extent，Significantly improve the sensitivity of high resistance fault detection in medium voltage distribution network，At the same time, the two main contents of this speech are introduced: the characteristic boundaries of fault and non-fault phases and their correlation with the power grid operating mode can tap the sensitivity potential of fault detection without misjudgment，The general rules of spatial distribution of signals under different power grid operating modes can lead to the accuracy and portability of fault location。Continue，Wei Mingjie demonstrated in detail his understanding of system parameter monitoring and high-resistance fault detection based on synchronized phasors through a summary of his past scientific research results、Understanding of high-resistance fault line selection and section positioning based on broadband synchronization signals，By formula、Graphics、Detailed explanations in various text methods，Explored the change mechanism of system operating status before and after the occurrence of high resistance fault，Realized the correlation between measurement signals and parameters reflecting the operating status of the system，Proposed an online monitoring method of system operating parameters using synchronous measurement and a high-resistance fault detection method that flexibly tracks system status；Starting from the theorem of orthogonality of broadband sinusoidal signals，Reveals the general rules of spatial distribution of broadband signals in different operating modes of distribution networks after high-resistance faults，Select the third harmonic component that dominates the nonlinearity of high-resistance faults，Proposed the third harmonic high-resistance fault line selection and section positioning method。

Free communication session，Students present asked questions on different issues，Including whether the broadband synchronization measurement in the title is inconsistent with the research on third harmonics in the lecture content and how master's students should prepare for thesis writing, etc.，Wei Mingjie also explained one by one。

Then, Secretary Song Sili presented the award to Wei MingjiePowerX Talks event commemorative certificate and speech，Song Sili mentioned，PowerX Talks series of activities adhere to the theme of "Ideas Light the Future"，Will play an important role in leading the academic thought of graduate students，Hope it can become a brand activity of the School of Electrical Engineering in the future，The method of holding should also be more flexible，Able to have greater coverage，Attract more students to participate，At the same time, the theme of the event can also be broader，Covering academics、Entertainment、Science and technology innovation and other aspects，More diverse forms，The college will also provide strong support。

Finally, the teachers and students present took a group photo with the speakers, this issuePowerX Talks Graduate Academic Thought Forum ended successfully with warm applause from teachers and students。

Speaker’s introduction:

Wei Mingjie, School of Electrical Engineering, Shandong University2018 PhD candidate，Study at Shandong University from 2013 to 2017，Bachelor's degree。Won the National Scholarship，UHV Scholarship，Shandong University graduate student innovation and entrepreneurship activities advanced individual honors and other honors。Currently published 11 SCI/EI journal papers，Published as the first author in the international authoritative journal IEEE Trans in the field of power system protection. 5 SCI papers including Power Delivery，3 papers in EI journals such as Chinese Journal of Electrical Engineering and Power System Automation，5 authorized invention patents，Participate in a national key R&D project。