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Xia Y.,China Electric Power Research Institute | Wang Y.,Huadian Zhangqiu Electrical Power Generation Co. | Yin Y.,Zhejiang Thermal Power Construction Company | Miao Q.,China Electric Power Research Institute
Applied Mechanics and Materials | Year: 2013

The shell is one important part of steam turbo-set condenser. Fangjiashan nuclear power project in Zhejiang Province is the domestic millions-kilowatt class PWR nuclear power plant. Its condenser shell modules have large size and heavy weight. At the same time by turbine house structure restriction, the traditional construction scheme is unable to satisfy the installation requirements. According to the condenser shell module structure characteristics and construction environment, the new construction technology such as four cranes integration operation, many times of changing hook, temporary hanging on the beam of steam turbine house, is studied and adopted. The supporting lifting frame is researched and developed. Four pieces of condenser shell modules with different hanging point size are successfully constructed. This can provide reference for the construction of similar equipment. © (2013) Trans Tech Publications, Switzerland.

Wang L.-D.,Zhejiang Thermal Power Construction Company | Duan Z.-C.,Zhejiang Huaneng Yuhuan Power Plant
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

Mal-operation of the relay protection equipment occurred when the transformer was put into operation in different power plants. According to the fault wave graphics and data, the mal-operation is caused by the incorrect closedown of magnetic inrush current of the second relay protection equipment. The specific reasons are the unreasonable mode and wrong coefficient value of secondary harmonic restraint. This paper analyzes the characteristics of harmonic restraint of T60 and RCS978, and discusses the advantages and disadvantages of inrush inhibit mode including per phase, or gate, 2-out-of-3, together with their corresponding inrush inhibit level. Finally, it puts forward a measure to decrease the mal-operation of inrush current.

Fu X.-F.,Zhejiang Thermal Power Construction Company | Lou G.-C.,Zhejiang Thermal Power Construction Company | Xu J.-B.,Zhejiang Thermal Power Construction Company | Ouyang Z.-S.,Zhejiang Jiaxing Power Plant
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

There is no start-up standby transformer design in an Indonesia international project, the voltage of generator-transformer group can not be boosted from zero due to the fragility of the auxiliary power. However, this problem can be solved by disconnecting generator outlet terminal and isolated-phase busbar(IPB)before the startup of unit and then verifying the sequence and polarity of generator-transformer group as described above, which can also shorten the testing time and simplify the test content for the startup of unit in an economical way.

Zhou L.,China Jiliang University | Peng X.,China Jiliang University | Wang X.,China Jiliang University | Ge H.,China Jiliang University | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

Manganese-zinc ferrites (Mn-Zn ferrites) nanocomposites were prepared by a solvothermal method and characterized by X-ray Diffraction,scanning electronic microscope and vibrating sample magnetometer. Effects of different factors, including the ratio of Mn2+ to Zn2+, the temperature and time of solvothermal reaction on the magnetic properties and microstructures of Mn-Zn ferrites were investigated. Results demonstrate that with the rising of reaction time, the particle size becomes bigger and more stable, and the saturation magnetization of the Mn-Zn ferrites nanocomposites increases; when the temperature are 160 and 180 °C, no Mn-Zn ferrites are formed for the temperatures are too low, and the formation temperature of Mn-Zn ferrites spherical particles is 200 °C; rising of Mn2+ concentration can not change the morphology of Mn-Zn ferrites, but will contribute to increasing of the saturation magnetization and decreasing of the coercivity of products obtained. Copyright © 2015, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

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