Rui Li

Northwest Institute of Nuclear Technology

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Jiancang Su

Northwest Institute of Nuclear Technology

Liang Zhao

China United Network Communications Group (China)

Jie Cheng

Xi'an Jiaotong University

Bo Zeng

Northwest Institute of Nuclear Technology

Yafeng Pan

Northwest Institute of Nuclear Technology

Hui Hui

Shandong Institute of Automation

Binxiong Yu

Northwest Institute of Nuclear Technology

Xudong Qiu

Commercial Aircraft Corporation of China (China)

Jing Liu

Northwest Institute of Nuclear Technology

Xibo Zhang

University of Nottingham Ningbo China

Cooperative Institutions

Tianjin University

Northwest Institute of Nuclear Technology

North China Electric Power University

State Grid Corporation of China (China)

Chinese Academy of Sciences

China Electric Power Research Institute

Zhejiang University

Tsinghua University

Xi'an Jiaotong University

Shanghai Jiao Tong University

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Enhancement of electrostatic charge dissipation properties of polymers by a sustained-release effect of mesoporous silica nanoparticles

Polymers for Advanced Technologies (2015)

Rui Li Jingjing Si Ping Tang

Small molecular surfactant (SMS), used as antistatic agent of polymers, is prone to the wash-out effects thus reducing its lifetime. To address this issue, the sustained-release antistatic agent is prepared by encapsulating SMS (HDC-102 or HDC-193) into mesoporous silica nanoparticles such as MCM-41 and is used to modify the antistatic properties of polystyrene (PS). The water-resistant test is used to evaluate the sustained-release effect, and the results showed that the HDC-102/MCM-41/PS composite retains favorable antistatic properties with the Rs of 6.2 × 1011 after five times washing, while the HDC-102/PS loses antistatic properties after twice washing. The contact angle measurement demonstrates that the sustained-release effect is affected by the characteristics of SMS. Moreover, the coefficient of thermal expansion of SMS/PS composites is decreased, and the thermal decomposition temperature is increased with incorporation of MCM-41. This approach may be used in polymer systems with the other small molecular additives to prolong their lifetime. Copyright © 2015 John Wiley & Sons, Ltd.

Antistatic agent

Polystyrene

10.1002/pat.3728

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Citations (7)

A Promising De-Ionized Water Cooling Based ERIP Bushing-II: Cooling Mechanism and Effect of Parameters

IEEE Transactions on Power Delivery (2022)

Binxian Lu Zhanbing Yue Rui Li Shan Liu Junyi Hou

Overheating has become a key factor that threatens the safe operation of the epoxy resin impregnated paper (ERIP) HVDC bushing and restricts its engineering application. The de-ionized water cooling based ERIP (DIWC-ERIP) bushing utilizes diffusion and convective heat transport to achieve low temperature distribution in the DIWC-ERIP bushing. In this manuscript, the temperature, heat flux density and the heat flux distribution of the DIWC-ERIP bushing are analyzed and the cooling mechanism is discussed. The heat flux density in the current carrying conductor (CCC) is mainly in axial direction. In the ERIP it is mainly in negative radial direction in oil tank side, and in positive radial direction in flange area and air box side of the bushing. The effect of the flow rate and temperature at inlet of de-ionized water on the temperature distribution of the bushing is studied by experiments and simulations, and the simulation results are very close to the measured results. The parameters of the thermal resistance per unit length of the thermal thin layer and the radii of water tubes have little effect on the temperature distribution of the bushing. The temperature distribution of the bushing can be controlled by the temperature of water at the inlet. Due to the strong heat dissipation capacity of de-ionized water, as the flow rate is 2 L/min, the maximum temperature of the ERIP doesn't exceed 120 °C.

Bushing

10.1109/tpwrd.2022.3218777

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Citations (2)

China’s photovoltaic power generation technology and application

IOP Conference Series Earth and Environmental Science (2019)

Rui Li

Abstract In recent years, with the continuous development of the concept of environmental protection economy and sustainable development, the development of new energy has been widely recognized, and the development of new energy has become a very important measure for the current filling of the energy industry. Solar photovoltaic power generation plays a very important role in the development of new energy. This article mainly describes the advantages of solar photovoltaic power generation technology, explains solar photovoltaic power generation system, explains the principle of solar photovoltaic power generation technology, discusses the advantages of solar photovoltaic power generation and insufficient, and show the current development and application status of solar photovoltaic power generation.

Solar Power

10.1088/1755-1315/300/4/042046

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Citations (5)

Calculation on heating effect due to void discharge in polymers in cumulative breakdown process

IEEE Transactions on Dielectrics and Electrical Insulation (2017)

Liang Zhao Jiancang Su Yafeng Pan Rui Li Lei Zheng

The relation between PDs and the growth of the discharge channel in polymers in a cumulative breakdown process under short pulses is investigated. By comparison with the Pachen Curve, it is found that the critical size for voids to discharge is in μm class. The heat deposition on the wall of voids is also calculated with a result that the temperature rise (ΔT) after one discharge is in a class of hundreds of Kelvin (K) and ΔT under a repetition rate greater than 100 Hz is tens of K for different types of polymers. The temperature rise has two effects on the voids in polymers: one is to cause the voids to crack along the direction of the applied electric field and the other is to cause local thermal breakdowns to occur in the vicinity of the void wall. Both of these effects lead to the growth of a discharge channel in polymers. The images observed in the cumulative breakdown process of PMMA (organic glass) using an on-line microscope under short pulses are presented to support the analysis.

Void (composites)

Deposition

10.1109/tdei.2017.006808

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Citations (8)

Influence Analysis of Distributed Generation on Reliability of Distribution Network

Journal of Physics Conference Series (2022)

Jianbo Zhao Wei Zhang Tao Du Hui Hui Changkai Shi

As more and more distributed generation (DG) are added to the distribution network, the safe and reliable operation of the distribution network is challenged. Firstly, in order to quantify the benefits of energy storage improving distribution network reliability, a value model of energy storage improving distribution network reliability is established. Then, in order to calculate the load range that can be supplied by the energy storage when the failure occurs, a probability distribution model of the remaining energy storage when the failure occurs is established, and islands are divided according to the output of wind power and photovoltaic. Then, based on the sequential Monte Carlo simulation method and Latin hypercube sampling, the reliability of wind storage and distribution network is evaluated. Finally, the influence of different energy storage capacity on the reliability of distribution network is obtained through simulation calculation.

Latin Hypercube Sampling

10.1088/1742-6596/2360/1/012025

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Citations (1)

Modelling for switching impulse breakdown of live working gaps between equipotential worker and transmission towers

IET Generation Transmission & Distribution (2020)

Yaqi Fang Linong Wang Rui Li Jiachen Gao Bin Song

Air gap discharge voltage is the key parameter to determine the minimum approach distance for live working. In this study, a mathematical–physical model for predicting 50% discharge voltage of the transmission line air gaps considering the effect of live line worker is developed based on the continuous leader inception criterion. Also, the tower structure coefficient ST is proposed to represent the influence of various tower structures and ST is calculated by finite element method. Finally, the switching impulse discharge tests of the equipotential worker-tower structure gaps are carried out on 750 kV transmission lines to verify the proposed model. The research results show that the errors between the calculation and experimental data are within ±4.03% which demonstrates the feasibility of discharge voltage prediction for complicated live working gaps. This model offers a possible way to determine the safety air gap distance for live working by analytical and numerical calculation rather than costly and time-consuming experiments.

Equipotential

Air gap (plumbing)

10.1049/iet-gtd.2019.0789

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Citations (12)

Review on Recent Development in Insulation Research Under Short-Pulse Conditions

IEEE Electrical Insulation Magazine (2023)

Liang Zhao Jian Cang Su Rui Li Bo Zeng Jie Cheng

This article summarizes the recent developments in insulation research under short-pulse conditions in the Northwest Institute of Nuclear Technology in China, which include four aspects: (1) solid insulation under nanosecond pulses, (2) vacuum insulation under microsecond pulses, (3) insulation design methods, and (4) long-lifetime insulation structures.

Microsecond

Nanosecond

10.1109/mei.2023.10044595

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Citations (2)

Optimized operation of microgrid based on gravitational search algorithm

Peng Li Weina Xu Zeyuan Zhou Rui Li

Microgrid plays an important role in the connection of distributed generation (DG) and power grid. Optimized operation of microgrid is an important aspect of in the research and development of microgrid. And an improved gravitational search algorithm (IGSA) is proposed to settle this problem. Gravitational search algorithm (GSA) is a new intelligent optimization algorithm, which has powerful global searching ability, good convergence and strong versatility and is easy to realize compared with other optimization algorithm. But it is easy to fall into local extremum for GSA. In the article, a multi-objective function of the optimized operation of microgrid is established.

Microgrid

Gravitational search algorithm

Optimization algorithm

10.1109/icems.2013.6754475

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Citations (6)

Simulation of Cavities Influence on Insulation Properties of Polymer Dielectrics Under High Voltage Pulse

Lecture notes in electrical engineering (2023)

Jing Liu Jiancang Su Liang Zhao Rui Li Huilai Li

High Voltage

10.1007/978-981-99-0357-3_19

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Citations (0)

Unique Solution of a Coupled Fractional Differential System Involving Integral Boundary Conditions from Economic Model

Abstract and Applied Analysis (2013)

Rui Li Haoqian Zhang Hao Tao

We study the existence and uniqueness of the positive solution for the fractional differential system involving the Riemann-Stieltjes integral boundary conditions , , , , , and , where , , and and are the standard Riemann-Liouville derivatives, and are functions of bounded variation, and and denote the Riemann-Stieltjes integral. Our results are based on a generalized fixed point theorem for weakly contractive mappings in partially ordered sets.

10.1155/2013/615707

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Citations (3)