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Ding Y.,State Grid Corporation of China | Li C.,Shandong Electrical Power Maintenance Company | Jin Y.,Shandong Power Economic and Technological Institute | Qi S.,Shandong Electrical Power Technology Co.
Proceedings of the 5th IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies, DRPT 2015

A method for power system reliability evaluation based on topology logic relation is presented. Firstly, topology logic analysis for substation is made to get equivalent nodes and the connectedness, then system topology logic analysis is carried out to get the power network model which is used to calculate the indicatrix on reliability of power system. The proposed method achieves a more realistic simulation of power system operation process and improves the accuracy of reliability assessment. Test on RBTS-BUS6 system proves that the method is correct and effective. Using this method in power grid reliability sensitivity analysis, the reliability sensitivity of primary equipments can be evaluated and compared directly to satisfy the demand for maintenance strategy better. © 2015 IEEE. Source

Xuan Z.,Shandong Electrical Power Maintenance Company
China International Conference on Electricity Distribution, CICED

Smart distribution grid with self-healing function can reduce the power outage time, and improve the power supply reliability effectively. Distribution automation system (DAS) provides a possible application for distribution grid self-healing. DAS can automatically isolate the fault, restore the power supply of non-fault section, reduce the power outage time effectively, and realize the distribution grid self-healing. This paper introduces the principle and control strategy of self-healing function of DAS in Ji'nan distribution grid. Through the comparison of two actual case of a 10kV line pre and post intelligent upgrade, it is proved that the proposed strategy is effective and the distribution self-healing is necessary. © 2014 IEEE. Source

Yuan H.-Y.,Shandong Electric Power Research Institute | Zhuang Y.-F.,Shandong Electrical Power Maintenance Company | Yao J.-X.,Shandong Electric Power Research Institute | Liu M.,Shandong Electric Power Research Institute
Gaoya Dianqi/High Voltage Apparatus

The calculation method of the HVDC transmission line conductor surface maximum field strength and electromagnetic environment parameters. For ±660 kV DC transmission line, the influence of the conductor surface maximum field strength on the ground synthetic electric field, the ground ion current density, radio interference and audible noise were analyzed. When the positive conductor voltage is between 620 kV to 680 kV, with the increase of the conductor surface maximum field strength, the synthetic ground electric field and ground ion current density increase by 1.2 times and 2.8 times. The influence on the radio interference and audible noise are relatively small, and the increased values are 17% and 0.3% respectively. When the ±660 kV DC transmission line is under rated voltage, the electromagnetic environmental indicators will not exceed the specified value in high voltage direct current overhead transmission line technical guidance. Source

Jiang Y.Z.,Shandong Electric Power Research Institute | Liang Z.G.,Shandong University | Ma W.J.,Shandong Electrical Power Maintenance Company | Wang H.C.,Shandong Electrical Power Maintenance Company
Advanced Materials Research

This paper discusses effect of shielding lines on reduction of electric field produced by overhead lines. Charge simulation method is used. Influences of height, space and number of shielding lines on electric field are calculated. Space between shielding lines has reverse roles on influencing area and maximal electric field. Number and space of shielding lines should be carefully selected to shielding a certain area. Analytical method is also used to express induced electric field by shielding lines. Result of comparison with charge simulation method shows that it is suitable for area outside of three phase lines. © (2013) Trans Tech Publications, Switzerland. Source

Chen R.,Shandong Electrical Power Maintenance Company | Feng X.,Shandong Electrical Power Maintenance Company | Gu C.,Shandong Electric Power Research Institute | Lin F.,Shandong Electrical Power Maintenance Company
Gaoya Dianqi/High Voltage Apparatus

With the increasingly widespread application of GIS equipment, type and number of GIS defects increases. Many defects can be reflected by thermal distribution. Based on the technology of infrared temperature measurement and thermal image analysis, two kinds of thermal defect mechanisms and manifestations for GIS equipment are introduced, the corresponding diagnosis basis is proposed, and by analyzing examples of the image features for internal and external heat defects, the reasons for defects are summed up, which provide effective reference for how to distinguish types and cause of the defects, thus providing technical support to improve the level of state detection and deepen condition-based maintenance work. ©, 2015, Xi'an High Voltage Apparatus Research Institute. All right reserved. Source

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