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Wang K.-X.,Shandong University of Technology | Wang K.-X.,Linyi Power Supply Company | Zhu C.,Dezhou Power Supply Company | Sun J.-J.,Shandong Electrical Power Engineering Consulting Institute Co. | Chen P.,Shandong University of Technology
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

For transmission lines, the paper analyzes the wave propagation process and the wave's refraction and reflection phenomena after the failure. On this basis, the paper proposes fault location method combining two traveling waves' theories. First, single-ended location principle is used to give preliminary fault location. And then the accurate results are given by single-ended principles combining with initial wave arrival time difference at both ends. The advantage of this method is that the results are obtained by single-ended location principle, eliminating the line length's error and the influence on location accuracy from circuit accurate time synchronization on both sides in double-ended principle location method so as to improve the accuracy and reliability of location. ATP simulations show that the combined traveling wave fault location scheme of transmission lines is feasible and fault location accuracy is improved obviously.


Zhang W.,Shandong Electrical Power Engineering Consulting Institute Co. | Liu Q.-S.,CAS Wuhan Institute of Rock and Soil Mechanics
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

The shear tests of bolted jointed rock mass were carried out in the laboratory to study the mechanical behaviors of anchor bolt in the jointed rock mass. In the experiment, rock mass of different strength, anchorage mode and prestress were simulated, meanwhile, the deformation characteristics of anchor bolts were monitored to compare the shear deformation regularity before and after bolting and to analyse the influences of prestress, rock strength, anchorage mode on shear capacity of jointed rock mass. Change of axial force was monitored through the strain gauge to study the axial deformation mechanism and force characteristics of anchor bolts. The distorted anchor bolts were taken out to analyse the relationship between the deformation length and other parameters after shearing test. Several conclusions were derived from the results of above tests: Shear stress vs. displacement curves can be divided into three stages: elastic stage, yield stage and plastic hardening stage, and show a feature of approximate double-linear lines. In elastic stage, the bolts act as "pin". In yield stage, the axial effect was activated and bolts functioned as both pin and confinement effect. In plastic stage, the bolts did not take the effect of pin, and just restricted the deformation of rock though its axial confinement effect. Shear load vs. displacement curves presented as plastic hardening mode, which means that the toughness of bolted jointed rock mass will be enhanced; and the failure mode changes from fracture mode into yield mode. So that the stability and safety of bolted jointed rock mass were improved. The bolt was sheared as a result of slippage of the joint and was led to additional axial deformation due to lateral deformation, the axial stress increased with the shear displacement. The region of distortion of the bolt concentrated nearby the joint surface and the closer to the joint surface, the more the augment of the axial stress was.


Qi L.,Shandong Electrical Power Engineering Consulting Institute Co. | Shi J.-Y.,Hohai University | Hou Q.,Shandong Survey and Design Institute of Water Conservancy
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

As an important part of load transfer behavior and settlement, the research for pile penetration into cushion would improve and perfect the theory of composite ground. There are only few studies of penetration. We analyze the shortcomings of existent calculating methods for penetration, and obtain the more rational method. Finally, this method is compared with the existent methods and model experimental results; it is shown that this method is reasonable and feasible.


Liu W.,Shandong Electrical Power Engineering Consulting Institute Co. | Li W.,Shandong Electrical Power Engineering Consulting Institute Co. | Sun J.,Shandong Electrical Power Engineering Consulting Institute Co. | Chen P.,Shandong University of Technology
Dianwang Jishu/Power System Technology | Year: 2011

To remedy such defects as low reliability and unsatisfied accuracy of fault location by traveling wave correlation algorithm, a single terminal traveling wave fault location based on fault location algorithm integrating multi-resolution morphological gradient with correlation function is proposed. To improve the shortcoming of gradient algorithm that it is sensitive to noise, the morphological filtering algorithm is added into it and the width of structuring element is appropriately widened to enhance the anti-interference ability of gradient algorithm. The surge caused by traveling wave is separated by a new type of multi-resolution morphological gradient transform, and by means of a variable structuring element the control of the width of traveling wave surge is implemented to make traveling wave surge possessing determined width. The structuring element in the proposed algorithm is a binary-diminishing element with variable flat structure. Setting the initial time-window length of multi time-window traveling wave correlation algorithm and the initial width of structuring element as the same and making them varying in the way of binary-diminishing, the multi-layer correlation analysis of traveling wave surge is performed to implement fault location of transmission line. Simulation results by Alternative Transients Program (ATP) show that the proposed algorithm is suitable to various fault distances and can offer higher fault location reliability and location accuracy.


Tian L.,Shandong University | Li W.,Jilin Electrical Power Survey and Design Institute | Wang Z.,Shandong Electrical Power Engineering Consulting Institute Co.
Advanced Materials Research | Year: 2012

In order to research the effectiveness of passive control on transmission tower vibration control under seismic excitation, suspended mass pendulum (SMP) is carried out in this study. Based on the mechanism and equation of earthquake vibration control, earthquake induced vibration control for transmission tower model with suspended mass pendulums was performed by using numerical simulation. Using SAP2000 software, three-dimensional finite element model of a transmission tower is created, and seismic records are selected by different site soils. Typical time history curves and the maximum responses of displacement, axis force, shear force and moment of the transmission tower without and with suspended mass pendulums are obtained by numerical simulation analysis. The results show that the SMP is very effective in mitigating tower vibration, and the method can be a reference for practice engineering application. © (2012) Trans Tech Publications, Switzerland.


Wang C.-C.,Beijing University of Civil Engineering and Architecture | Zhang Y.-Q.,Beijing University of Civil Engineering and Architecture | Zhu T.,Beijing University of Civil Engineering and Architecture | Zhang X.-Y.,Shandong Electrical Power Engineering Consulting Institute Co. | And 2 more authors.
Polyhedron | Year: 2015

Four novel coordination compounds based on d10 metals, 1,10-phenanthroline (phen) and 2,2′,3,3′-oxydiphthalic acid (2,2′,3,3′-odpt), 3,5-di(3,4-dicarboxylphenyloxy)benzoic acid (dcpb) or 1,3-(3′,4′-carboxylphenoxy)benzene (cpb), namely [Co2(phen)4(2,2′,3,3′-H2odpt)2]·14H2O (1), [Co2(phen)4(H4dcpb)2]·14H2O (2), [Cu(phen)(H3dcpb)] (3) and [Mn(phen)2(H2cpb)] (4), have been synthesized under hydrothermal conditions and characterized by the methods of single crystal X-ray diffraction, FTIR, elemental analysis and UV-Vis diffuse spectroscopy. The isostructural compounds 1 and 2 consist of discrete neutral [Co2(phen)4(L)2] (L = 2,2′,3,3′-odpt for 1 and dcpb for 2) units and lattice water molecules, forming 3D frameworks with the aid of rich hydrogen bonding interactions. Compounds 3 is built up of discrete neutral [Cu(phen)(H3dcpb)] units to construct a 3D framework via π-π stacking interactions. Compound 4 consists of 1D neutral [Mn(phen)2(H2cpb)] helix chains, further forming a 3D framework via rich hydrogen bonding interactions. The photocatalytic activities of degradation of methylene blue (MB) and methyl orange (MO) in compounds 1-4 under UV light irradiation were determined, and the results revealed that compound 4 can decompose MB and MO efficiently. The different degradation efficiencies of compounds 1-4 implied that the HOMO-LUMO gap should be utilized to describe the discrete character of the light-induced transitions in the coordination compounds. © 2015 Elsevier Ltd. All rights reserved.


Liu H.J.,Shandong Electrical Power Engineering Consulting Institute Co.
Advanced Materials Research | Year: 2013

According to the characteristics of Wet Flue Gas Desulphurization (FGD), this paper brings forward the automatic control requirements and the control methods. The automatic control system is composed of a Programmable Logic Controller (PLC) and an industrial control computer (PC). The automatic control system can monitor the operating parameters of FGD system automatically and conduct automatic control and adjustment to FGD system. The PLC is responsible for the data collection and automatic control, while the PC is responsible for the surveillance of FGD system operation and the data processing through mutual communications between PC and PLC, which realizes the communication between human and machine and ensures the safe, stable and economic operation of the FGD system. © (2013) Trans Tech Publications, Switzerland.


Tian L.,Shandong University | Jin S.,Shandong Electrical Power Engineering Consulting Institute Co. | Wang Z.,Shandong Electrical Power Engineering Consulting Institute Co.
Applied Mechanics and Materials | Year: 2012

In this paper, multiple tuned liquid dampers control for rain-wind-induced response of long span transmission tower is investigated. Equations of motion for a structure-TLD system are derived. According to the mechanism of vibration control, rain-wind-induced vibration control for tower model with multiple tuned liquid dampers is carried out by using numerical simulation. Three-dimensional finite element model of tower based on a real project is established. Rain-wind load time history is simulated based on wind and rain theory. Time history curves and the maximum responses without and with tuned liquid damper under rain-wind excitation are analyzed and discussed. The results show that the tuned liquid damper could decrease the rain-wind-induced response of long span transmission tower, and the device could be installed in tower when the response too large. © (2012) Trans Tech Publications.


Zheng Z.-J.,Shandong Electrical Power Engineering Consulting Institute Co. | Li L.,Shandong Electrical Power Engineering Consulting Institute Co. | Zhao L.-M.,Shandong Electrical Power Engineering Consulting Institute Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

Mid-long term load forecasting goes through a long time and the base data are influenced by a number of factors, most of which are beyond the control and with uncertainty. In order to deal with the data uncertainty problem in mid-long term load forecasting, Monte Carlo method and interval arithmetic are introduced. According to actual situation in history, it is assumed that the base data have uncertainty in a certain range. Using Monte Carlo method to construct the calculation process can obtain the load prediction result in a certain interval. Using interval algorithm to describe the uncertainty of base data, and for reducing overestimation of interval arithmetic, suitable formula is deduced to avoid the conservative results, with the advantages of saving computing time because only once computation can seriously analyze the effect of data uncertainty on prediction results. The proposed two methods have been tested on the load forecasting of one province. In consideration of the base data with uncertainty, by comparing with conventional load forecasting method, the results demonstrate the two approaches can evaluate the effect of data uncertainty on load forecasting, and avoid getting conservative results.


Li J.,Shandong Electrical Power Engineering Consulting Institute Co.
Advances in Science and Technology of Water Resources | Year: 2013

In order to study the durability of concrete piles in a corrosive groundwater environment, concrete corrosion resistant test of pile foundation in the environments with Cl- and SO4 2- coexistance and with only SO4 2- existance was performed, according to medium-highy corrosive groundwater geological conditions of a large power plant in Shandong. The results show that in the Cl- and SO4 2-coexistence groundwater environment, sulfate attack concrete situation is slightly lower than in the presence of SO4 2-only environment, the conventional doped preservatives does not significantly increase corrosion resistance, and resistance to sulfur cement and sulphate resistance of ordinary Portland cement remain close, but resistance to chloride ion invasive can not meet durability requirements. Finally, the ordinary Portland cement and admixture with low water-cement ratio, high-performance concrete pile can be used to meet durability requirements.

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