Henan Electric Power Company
Henan Electric Power Company
State Grid Corporation of China, Henan Electric Power Company, Henan Epri Electrical Technology Co. and Xi'an Jiaotong University | Date: 2017-03-05
A device for calculating trapping parameters by measuring short-circuit current decay under a reverse bias voltage, including: a vacuum chamber, an experiment table, a lower electrode, a shielding layer, an upper electrode, a direct current charging module, a switch, a short-circuit measuring system, and a computer. The experiment table, the lower electrode, the shielding layer, the test sample, and the upper electrode are disposed from the bottom up in that order inside the vacuum chamber. The upper electrode is connected to the direct current charging module via the switch. The upper electrode and the lower electrode are electrically connected via the short-circuit measuring system. The short circuit or the detrapping current measuring circuit is selectively electrically connected under the control of the selective switch. The reverse bias voltage source and the microammeter are connected in series.
Zheng G.,Henan Electric Power Company
Information Technology and Career Education - Proceedings of the International Conference on Information Technology and Career Education, ICITCE 2014 | Year: 2015
The management of electric energy measuring is an important link of our production and management and the safe operation of power grid. Scientific and reasonable management modes help the development of all industries. The exploration of management modes is a process of management decision. In this paper, a study is carried out on the management decision of electric energy measuring of power grid dispatching. On the basis of an overview on electric energy measuring management, a decision model based on analytical hierarchy process and a decision model based on decomposition and combination of system task are established and a mode of electric energy measuring management is constructed with the method of decision model. By comparing with the original mode in terms of cost budgeting of 5, 10 and 15 years, it concludes that the target mode of electric energy measuring based on decision model will show more advantages with the application time, which will be gradually enhanced. © 2015 Taylor & Francis Group, London.
Yang W.,Henan Electric Power Company
POWERCON 2014 - 2014 International Conference on Power System Technology: Towards Green, Efficient and Smart Power System, Proceedings | Year: 2014
Monocular vision method is used for transmission line galloping monitoring method in this paper, and feature points is traced in the transmission line dancing video and the two-dimensional pixel variation curve is extracted feature. The parameters such as distance between feature points measured and shooting dot, camera elevation and angle of the line can be measured by the recording laser rangefinder, the corresponding relation between the pixels and the actual distance can be calculated combined with the camera focal length and pixel size parameters. The transmission line galloping trajectory can be got based on the calibration coefficient and pixel curve combination, so as to realize monitoring amplitude, frequency and order of the galloping. The accuracy and applicability of method of measuring experiment is verified by dancing model test line. © 2014 IEEE.
Tian X.-D.,Henan Electric Power Company
Environment, Energy and Sustainable Development - Proceedings of the 2013 International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2013 | Year: 2014
Luyang 1000 MW thermal power unit as the first 1000 MW unit project in central China, is also China's first 1000 MW unit project approved under the policy of "encourage large projects and discourage small energy-inefficient power plants". The safe operation of the boiler has great significance. This paper introduces debugging and application of the Furnace Safety Supervision System (FSSS) in Luyang 2 × 1000 MW unit I and recommends some problems to be concerned for technical personnel about the system debugging, maintenance and use. © 2014 Taylor & Francis Group, London.
Xiao Q.,Henan Electric Power Company
Applied Mechanics and Materials | Year: 2014
Online power system analysis to electric mode-based on information that will offer a decided in real time the quality of the studies and efficiency of the power system operation precision closely associated with the power system model. Accurate and quick decision based on real-time data analysis needs battle plan deregulation of the power system in all over the world. In addition a significant expansion of electric power system in India in recent times, especially in the 2003 introduction of electricity bill, introduction of open access, electric power market, the appearance of communication through power with complex power system operation and control. Electric power network analysis in real-time data is expected to further improve the critical role of power network operation to repair the proposed law after transmission loss of tariff and share. All this forced the power system real time is accurate, but conditions analysis based on different principles. In order to meet the requirements of all, from the monitoring, commercial, reliability and stability of the Angle, attempt to have been forced to take hybrid network model in natural real-time supervisory control and data acquisition (SCADA) systems work so far a single network model of the integrated. This paper presents a network model for the theory foundation and the same is in the southern area rapidly adapt to load center (SRLDC) Bangalore and utilization of energy management system in India (EMS) real-time systems and tools. It is proved to be how to planning can online network system modeling and analysis of relatively simple in complex operational requirements. The experimental results show that the online power management strategy to adapt to can be a key tool control engineers hand in complex power system operation situations. © (2014) Trans Tech Publications, Switzerland.
Liu Y.,Henan Electric Power Company
Granular Matter | Year: 2014
A theoretical calculation method for the flow rate of granular matter from an inclined orifice is discussed in this article and for the inclination angles at θ ≤ 90°, a theoretical relation between the flow rate Q and inclination angle θ is derived; and for the inclination angles at θ > 90°, a semi-theoretical relation is established. From the relations, we found that the ratio of the flow rate from a vertical orifice, Q90, to that from a horizontal orifice, Q0, is equal to the sine of the angle of repose θr, i.e., Q90/Q0= sin θ r. The theoretical relations are tested by means of the experimental data and the results indicate that the theoretical calculating values are in good agreement with the experimental data over a wide range of the inclination angles. Therefore, the formula proposed in this article can be used for the theoretical calculation of the flow rate of granular matter from an inclined orifice. The relation Q90/Q0 = sin θr may be used as an alternative approach to obtaining θr: measuring Q90 and Q0, and then calculating θr by using formula θr = arcsin (Q90/Q0). © 2014 Springer-Verlag Berlin Heidelberg.
Wang L.,Henan Electric Power Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012
In order to verify the networking feasibility of the information process level of smart substation, this paper first analyzes and points out the star network is the best network solution of smart substation process level. Through the analysis of network modes of the process layer, network information flow, transmission delay and networking technology, it puts forward the technical scheme of combo network of SMV sampling information, GOOSE substation universal event information and IEEE1588 (or SNTP) clock synchronization information. Adopting VLAN tag technology can reduce network broadcast data and improve the utilization rate of network bandwidth. Applying IEEE 802.1P flow priority control technology can guarantee the timeliness and orderliness of information transmission. Using rapid spanning tree technology can achieve network reconfiguration and avoid the network storm. By simulation test and engineering verification, its performance specifications fully meet the technical specifications of the substation, ensuring safe and reliable of the substation, and its the technical solutions are reliable and feasible.
Bai H.-K.,Henan Electric Power Company |
Li G.-S.,Henan Electrical Power Survey And Design Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010
Along with electrical network structure's unceasing enhancement, the short-circuit current level of 220 kV electrical network enhances quickly, to further lower the short-circuit current level, open-loop operation mode must be carried out gradually. When the structure of 500 kV and 220 kV power grid is still not perfect, open-loop operation is often difficult to achieve. This paper proposes a weak open-loop mode, takes Sanmenxia power grid in Henan as an example, and explains this kinds of open-loop form. Conclusion is that the use of weak open-loop way is better than the completely open-loop mode in the transitional period, and it can provide a new mode to safe and reliable operation of power grids.
Zhao F.,Henan Electric Power Company
PEAM 2011 - Proceedings: 2011 IEEE Power Engineering and Automation Conference | Year: 2011
In order to solve the problem of the imbalance between the fault data and the normal ones in the fault diagnosis of transformer, we adopt k-means algorithm to cluster the data. The result of clustering shows the existence of the boundary class that is between fault and normal ones. The separation of boundary class from the fault data and the normal ones improves the reliability and early warning ability of fault diagnosis of transformer, as well as reduces the influence from the imbalance of the two kinds of data. © 2011 IEEE.
State Grid Corporation of China, China Electric Power Research Institute, STATE GRID HEBEI Electrical POWER COMPANY, Henan Electric Power Company and Jiangsu Electric Power Company | Date: 2015-03-12
The present invention discloses a method for lightning stroke identification and location on optical fiber composite overhead ground wire. In the method, according to the property that the lightning stroke will cause a sudden temperature rise at the lightning stroke position on the optical fiber composite overhead ground wire, optical fiber resources in the optical fiber composite overhead ground wire and the high-sensitivity detection and high-precision event locating capability of a distributed optical fiber temperature sensor can be fully utilized. The distributed optical fiber temperature sensor is connected to a spare optical fiber in the optical fiber composite overhead ground wire, and the corresponding relation between the geographical position of the optical fiber composite overhead ground wire and the distributed temperature curve is established, and then the temperature data at the same position in the temperature curve at different moments are respectively compared to extract a sudden temperature change area. In addition, the temperature change of several positions adjacent to the sudden temperature change area in the temperature curve are compared to exclude interference factors in temperature measurement, so as to determine that the sudden temperature change is caused by instant heating from an external factor, namely the lightning stroke, and finally, the lightning stroke is identified and located in combination with the change of counting data of a lightning arrester.