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RSS2019 Vol. 6, No. S1
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2019, 6(S1): 1-5.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.001
Abstract:
[Introduction] At present, most of the islands in China supply electricity mainly by equipping diesel generators. This form of energy supply has the problems of high cost and low efficiency of energy utilization. [Method] According to the current situation of energy demand in an island, this paper designed a scheme of comprehensive utilization of the waste heat of diesel generator in the island from the point of view of distributed energy supply, in order to solve the problem of island energy supply. [Result] The scheme improves the efficiency of energy utilization, reduces the pressure of island energy supply effectively, and reduces about 20% of the refrigeration cost. [Conclusion] The scheme proposed in this paper is conducive to the improvement of energy efficiency and investment economy. It has important practical significance for improving the production and living conditions of the island.
2019, 6(S1): 6-9.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.002
Abstract:
[Introduction] In the transformation of urban LED streetlight, more and more Energy Management Contracts (EMC) are adopted. The Energy Service Company(ESCO)is responsible for the investment, construction and operation. [Method] This paper analysed EMC in the transformation of urban LED streetlight from ESCO perspective. It classified ESCO and mainly analysed the process and management key. [Result] It analyses the economic and energy-saving benefits combined with a case. The project has certain economic benefits. [Conclusion] ESCO can participate in more urban LED streetlight transformation by strengthening the whole process management, innovating service content and method.
2019, 6(S1): 10-15.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.003
Abstract:
[Introduction] In order to effectively solve the problem of flow-accelerated corrosion in the thermal system and high scaling rate of boiler of supercritical unit, the feed water needs to be treated. [Method] At present, there were three kinds of water treatment: reducing total volatilization treatment, weak oxidation total volatilization treatment and oxygenated treatment. [Result] After the oxygenated treatment of feed water, the shape of the oxidation film on the heating surface of the boiler is changed, and the amount of ammonia can be appropriately reduced, which is beneficial to improve the quality of mixed bed effusive water. For the supercritical DC furnace, the dissolved salts of steam are also reduced, and the corrosion and salt formation of the medium and low pressure cylinders of steam turbines are further improved. [Conclusion] At present, feed water with oxygen treatment is the best choice for supercritical unit.
2019, 6(S1): 16-21.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.004
Abstract:
[Introduction] The section of the entire suspension steel inner cylinder in chimney is mainly in a state of tension, and the joints are less conducive to leakage prevention. The design and construction of the entire suspension steel inner cylinder, expansion joint and suspension platform are much more complicated. In order to solve the key problems in the design of suspension platform, steel inner cylinder, guide point and expansion joint, a structural design scheme of integral suspension chimney steel inner cylinder was proposed. [Method] Through specific engineering examples, combined with calculation and analysis, the truss suspension platform structure and new suspension point design scheme were finally determined, and the calculation model of continuous beam considering the rotational stiffness of suspension platform was established for steel inner cylinder. The socket expansion joint was adopted and sealed with sealing fluid. [Result] The results show that the design scheme meets the requirements of sealing and durability of chimney, and is convenient for construction and shorten the construction period. [Conclusion] Through exploring and researching the structural design of steel inner tube of entire suspension chimney, the design scheme adopted has achieved better economic benefits, which can provide reference for similar projects.
2019, 6(S1): 22-27.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.005
Abstract:
[Introduction] The urgent purchase of the equipment and material in the power plant will highly threaten the schedule of the project. In order to reduce the occurrence of the urgent purchase so as to lower the risk of blocking the erection schedule due to material omissions, this paper aims to summarize the common omissions and their cause in the executed projects. [Method] To search for the common omissions, we collected the opinion of the construction professionals using interview method, and explored the cause of the omission using fishbone diagram. [Result] The result we obtained demonstrates that the engineer′s ignorance, the unclear scope of the main equipment, and confusing range of construction contract are the top main cause of omissions. [Conclusion] Thus, Omissions of the procurement can be avoided to the utmost extent from the very early contract phase by organizing the procurement package in a reasonable way.
2019, 6(S1): 28-31.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.006
Abstract:
[Introduction] Carbon capture, utilization and storage technology (CCUS) is a technology for reducing greenhouse gas, which can significantly reduce the greenhouse gas emission from fossil fuels, including four links of carbon dioxide capture, transportation, utilization and storage. [Method] This paper summarized the relevant policies on CCUS at home and abroad, and analyzed the development trend of the technology. [Result] The results show that major developed countries in the world have issued relevant policies to support the development of CCUS. In the past decade, our government has issued a number of CCUS policies and documents to promote the development of CCUS. Scientific research institutes and enterprises need to work together and promote the innovation and application of CCUS technology, to build an international leading CCUS industry chain, and help China to fulfill its carbon emission reduction commitments and responsibilities. [Conclusion] The article′s opinions play a guiding role in the construction of CCUS-related projects.
2019, 6(S1): 32-35.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.007
Abstract:
[Introduction] In order to solve the problem of large workload, low efficiency and low accuracy of I&C wiring design. [Method] The Siemens COMOS platform was used to develop intelligent wiring software. Through modeling local equipment, DCS equipment library and channel, the related interfaces were developed to achieve local equipment wiring, DCS wiring and cable merging automatically. [Result] Finally reach a key to export finished products of wiring diagram. [Conclusion] By popularizing and applying in actual engineering, it shows that intelligent wiring software can greatly reduce the workload, improve the wiring accuracy, shorten the construction period, and effectively save labor costs. In the future, the software will be further upgraded to achieve wiring design for the other majors such as electrical.
2019, 6(S1): 36-40.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.008
Abstract:
[Introduction] To improve the utility of pump and motor in CCS system, it is necessary to evaluate the condition of pipes located in first bay of nuclear power station turbine plant. [Method] For the convenience of calculatiion, different pipe conditions were evaluated with several proper assumptions. Mathematical modeling and fluid mechanic analysis were also applied in the evaluation. [Result] Our evaluation indicates that CCS can still work safely even in the most unfavor assumption on the maximal flow of broken pipe. [Conclusion] Our method shows correct and solid result in evalution and the method is expected to be applied in design of subsequent constructions in the future.
2019, 6(S1): 41-46.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.009
Abstract:
[Introduction] The paper aims to find out the reason why the forecast error of energy production using high-precision map is much larger than that using low-precision map in several wind power projects with complex terrain. [Method] The calculation and analysis of energy production under the conditions: reference map, high-precision map and low-precision map were carried out, by using the open source CFD software OpenFOAM with self-compiled post-processing program. [Result] The results show that the terrain along prevailling wind direction at meteorological mast excessively different from the reality leads to the greater forecast error of energy production in high precision map. [Conclusion] The data validate the analysis results and obtain the universal law that the consistency between terrain and reality at datum points of different precision maps determines the difference of total energy production. This work provides beneficial reference for wind resources assessment in complex terrain.
2019, 6(S1): 47-53.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.010
Abstract:
[Introduction] Aims to the characteristics of incremental distribution network investment, such as more sensitive to project cost, benefit and duration. [Method] This article analyzed the standard design scheme of substation in China Southern Power Grid, simplified the substation scheme by combining prefabricated cabin technology and assembly structure technology. [Result] Two 110 kV simplified substation schemes for different main transformer scale are presented. [Conclusion] On the one hand, they have basic functions as a substation. on the other hand, the construction difficulty, time limit and cost are greatly reduced, which makes it possible to duplicate, relocate and recycle substation. It provides a reference for the construction scheme to promote the development of incremental distribution network.
2019, 6(S1): 54-57.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.011
Abstract:
[Introduction] Paper aims that the busbar protection can reliably and quickly remove the fault bus when the disconnecting switch is wrong in the process of bus switching operation, the principle of bus double-position switch configuration and virtual current differential mutual calibration is put forward, and its theoretical analysis and dynamic model simulation test are carried out. [Method] Based on the above requirements, the virtual current differential logic assisted by dual position information of switch can solve the problems in the switching process of substation. [Result] In terms of mathematic quantization theory, the double position information of bus protection cutter and switch reduces the possibility of location error, and then assisted by virtual current differential logic to correct the error, can very well avoid substation switching operation problems leading to bus non-selective tripping. [Conclusion] Busbar protection can be connected to double-position switch auxiliary opening and assisted by virtual current differential logic criterion, which can effectively correct the abnormal position of switch during switching operation for bus, thus ensuring the selectivity and reliability of bus protection.
2019, 6(S1): 58-63.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.012
Abstract:
[Introduction] Considering the increasing development of distribution network and the demand of informationization, we use UAV instead of manual means to perform power equipment inspection and improve the automation level of distribution network asset management. [Method] Based on IOS and DJI SDK, this paper developed multi-rotor UAV patrol flight control app, automatically collected panoramic raw data according to preset flight route.Then uploaded processed panoramic image server and used DFS distributed storage to manage images. Based on Three.js, builded smooth three-dimensional panoramic scene and achieved functions like scene roaming, hotspot labeling, double-screen contrast and other functions. [Result] The UAV control App has developed panoramic acquisition, fine inspection, rapid mapping and other modules according to the characteristics of distribution network inspection. It solved difficulties in the traditional inspection and manned helicopters in power inspection and met the needs of power grid daily inspection, fault inspection and emergency rescue. Built a distribution network panoramic management system and stored UAV inspection panoramic data in server cluster. Then intergrated and manage the gid assets and inspection panoramic data. [Conclusion] This paper improves the efficiency of patrol image acquisition of distribution network, standardizes the data acquisition process, manages and applies massive image data and then effectively improves the automation level of information of distribution network.
2019, 6(S1): 64-69.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.013
Abstract:
[Introduction] In order to study the seismic effect of RC wall-steel hybrid structure valve hall and provide basis for engineering design, a time-history analysis is carried out. [Method] Two natural seismic waves and an artificial seismic waves based on response spectrum were adopted. The calculation was done via Midas/gen program. [Result] Comparison between time-history analysis and response spectrum method indicates that response spectrum method may underestimate the seismic effect of such irregular hybrid structure. [Conclusion] So for structures in high intensity earthquake area, time-history analysis is necessary in addition to response spectrum method.
2019, 6(S1): 70-74.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.014
Abstract:
[Introduction] The current distribution quota system is mainly used in the feasibility study of the distribution network project to the construction of the construction cost of the construction drawing design phase. The essence of the distribution quota system is the valuation model of "quantity and price integration" ; the integrated unit price of the distribution network bill of quantities is still fixed. The pricing method determines that, in essence, the fixed pricing model is still used, and the pricing of the distribution list has not yet reached a mature market environment. In order to adapt to the characteristics of the socialist market economy in the new era, promote the orderly competition and healthy development of the power grid engineering construction market, promote the transformation of the management functions of the engineering cost industry, meet the needs of the entire process of cost data management, and increase the participation of all parties involved in the international construction. The ability to compete and optimize and improve the current pricing system for distribution network projects is necessary and urgent. [Method] This paper summarized the applicability and limitations of the current distribution network engineering pricing system and combines with the current distribution network cost management and market economy development needs to explore and try to optimize the structure of the distribution network pricing system. [Result] After comparison and optimization of distribution network cost, the optimized pricing system structure is more in line with the needs of current market economy development. [Conclusion] This work provides some guidance for further study on the optimization of distribution network engineering.
2019, 6(S1): 75-80.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.015
Abstract:
[Introduction] The paper aims to establish a favorably operating environment, improve the reliability of power supply and operation and maintenance efficiency, and construct a safe, reliable, efficient and self-healing smart distribution station. [Methods] In this paper, a large number of distribution station environment and maintenance problems were statistically analysed, and put forward the necessity of the constructing smart distribution station, and developed the technical route of the construction of smart distribution station on the basis of full investigation of monitoring equipment technology, then summarized the technical difficulties encountered in the promotion and construction of smart distribution station, made further research of pilot operation analysis of the project with the relevant equipment manufacturers, using micro-positive pressure ventilation technology, passive wireless sensor detection technology, intelligent linkage and remote control technology, artificial intelligence technology based on image recognition, installation of key sensors to achieve non-processing, non-damage and other advanced technologies. [Result] The results we solved the key technical points and difficulties of circulating ventilation, eliminating dew point, creating intelligent operation and maintenance scenes and monitoring equipment status of smart distribution station, then satisfied the construction requirements of no manual operation and maintenance, no power failure installation and no influence. [Conclusion] The solution proposed is not only included in the standard technical document of smart distribution station, but also extensive used in the construction of smart distribution station.
2019, 6(S1): 81-84.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.016
Abstract:
[Introduction] In order to realize the electronization, standardization and flow of audit work, maximize the productivity of auditors, improve audit quality and resource utilization. [Method] Starting from the actual situation of comprehensive management of electric power enterprises, through introducing advanced concepts, the integrated management online auditing system was applied and implemented. [Result] It is a powerful measure to further promote the study and practice of the scientific concept of development, to meet the needs of auditing information acquisition at different levels, and to provide decision-making Kanban at different levels and dimensions. [Conclusion] Assessment and evaluation of the rationality of business operations, the orderliness of business activities, the effectiveness of internal control and the reliability of information systems enable business managers to obtain timely audit information, identify problems and weaknesses in business management, promote the improvement of business processes and value added of enterprises and determine the next audit focus or focus.
2019, 6(S1): 85-90.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.017
Abstract:
[Introduction] This paper discusses the crossing scheme of cross-gate waterway. Due to the restriction of site and backfilling stone on the side of Hengqin, the only way to cross the Crossgate waterway is towing pipe. [Method] In this paper, the key control indicators such as pullback force and radial stability of pipe were fully compared and the finite element method was used to check the radial stability of pipe. [Result] The results show that MPP pipe is recommended to meet the safety requirements and facilitate construction. [Conclusion] We demonstrate the feasibility of the calculation method, and this work provides some guidance for the practical application.
2019, 6(S1): 91-96.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.018
Abstract:
[Introduction] To improve the investment management ability of power grid corporation and enhance the quantifiable evaluation level of investment decision. [Methods] The impact factors of comprehensive power loss rate on the wire were analyzed, and the quantitative relationship between the improvement of the index and the investment was established through the panel data model and the regression analysis of historical data. [Results] The modeling results can measure the investment benefits in decreasing power loss rate on the line under various influencing factors, and forecast the Investment demand in the next year according to the comprehensive plan target value of the grid company, and complete the investment feedback of the index improvement, so that each investment can be measured beforehand, and can be evaluated afterwards. [Conclusion] The research results of this paper can strengthen the quantifiable evaluation level of investment decisions and meet the lean management needs of enterprises.
2019, 6(S1): 97-102.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.019
Abstract:
[Introduction] Taking shield power tunnel as an example, according to its construction characteristics, the purpose and method of shield power tunnel construction monitoring are systematically analyzed. [Method] Firstly, the monitoring layout method of tunnel construction in China and the characteristics of power tunnel were combined with, the purpose and scope of monitoring were analyzed, the deformation control standards of surrounding structures and their own structure requirements were obtained; Then, the monitoring method of shield power tunnel construction, the data processing method of management measures, the result submission method and the information feedback strategy were analyzed and put forward in the paper. Combining with the monitoring practice of a shield power tunnel construction, the paper analyzes and demonstrates the monitoring purpose and method. [Result] Combined with the construction monitoring practice of a shield tunnel, the purpose and method of the monitoring are analyzed and demonstrated. [Conclusion] The research results provide great significance for the safety and smooth construction of shield power tunnel, and can also provide a reference for other similar projects.
2019, 6(S1): 103-106.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.020
Abstract:
[Introduction] By combing and quantifying the indexes, the weights of the first, second and third grade indexes of the green power grid are obtained. [Method] In 2013, China Southern Power Grid Company issued "3C Green Power Grid Construction Evaluation Standard" , which was used to guide the construction of Green Grid of Southern Power Grid Company. In the process of standard extension, researchers found that the standard used a " list" evaluation system, which had a weak guiding effect on the selection of technology for the project. In 2017 and 2018, Southern China Power Grid Company launched a revision of the standards. The weight of the index is determined by the group expert analytic hierarchy process, which combines the advantages of the group expert method and the analytic hierarchy process method, and relied on the decision making of the group expert, and reduces the error of the group expert decision by mathematical method. It was suitable for the quantification of green power grid. [Result] Setting up a pool of experts that includes leaders and technological experts, carry out the first-level index scoring work for the leaders, and carry out the secondary and tertiary index scoring work for the technological experts. According to analytic hierarchy process (AHP), the evaluation indexs of green power grid is combed and quantified. [Conclusion] Group expert Analytic hierarchy process (AHP) is suitable for the quantitative evaluation of green power grid. This index quantification work is the solid foundation for the green grid quantification appraisal work.
2019, 6(S1): 107-112.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.021
Abstract:
[Introduction] Nuclear power units stop operation when intake tunnel fails to work under the earthquake, then it needs adequate water to ensure the preheat discharge and safety shutdown. Seismic analysis of slopes with safety-related water intake structure is the one of the important content for NPP seismic safety assessment report. [Method] To take a slope with certain safety-related water intake structure, we proposed a suitable seismic checking method and calculation flow for slopes with safety-related water intake structure. [Result] The results we obtained demonstrate that the static analysis method takes into account the spatial difference of dynamic amplification coefficient of slopes under earthquake, and can consider further deformation and nonlinearity, while the dynamic analysis method can show the temporal and spatial effect of earthquake influence coefficient. The results show that point safety method is more appropriate for evaluation of slope stability. [Conclusion] This work provides some guidance for further seismic analysis of NPP slopes with safety-related water intake structure.
2019, 6(S1): 113-118.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.022
Abstract:
[Introduction] The paper aims to investigate the conversion relationships of different time interval averaged wind speeds in tropical cyclone and evaluate extreme wind speed of electric projects. [Method] Wind speed records from an island meteorological station in Pearl River Delta during 14 samples from 1991 to 2009 were employed to calculate gust factor between 3 s, 10 min, 1 h wind speed and effects of wind speed, terrain roughness, and typhoon track were analyzed. [Result] Results show that gust factor gradually decreases and approaches to a certain range when corresponding mean wind speed increasing while statistical distribution of gust factor is relatively insensitive to typhoon track. Offshore wind appears higher gust factor than onshore wind with different roughness. [Conclusion] This work supports the availability of recommended values from World Meteorological Organization in Pearl River Delta coastal area.
2019, 6(S1): 119-123.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.023
Abstract:
[Introduction] The 500 kV Fugang Line submarine cable route is the only high-voltage cable channel connecting Hainan Province and the mainland across the Qiongzhou Strait. Due to the rapid flow of water in the Strait., number of ships pass through, the fishermen have frequent activities, and fishermen′s random anchoring is serious. If the exposed or suspended cables are subjected to external forces, they will be bent and deformed. If the deformation is too large, the internal structure of the cable will be damaged and seriously lead to cable fracture. [Method] This article discussed the use of Multbeam System to scan submarine cable routing terrain, according to the massive data collected in the past. The Kriging interpolation method was used to generate the DEM model and compared the elevation values of both. Analyzed the evolution of terrain and the trend of sand wave. [Result] The Multibeam System has the characteristics of large data volume, small dot spacing and high precision in the analysis of submarine terrain scouring and micro-geomorphology evolution, which can well grasp the changing trend. [Conclusion] For offshore structures with complex water flow and complex seabed topography, it is recommended to use a Multibeam System to regularly scan the surrounding terrain, master the trend of organic carriers, provide data basis for the protection measures of offshore structures and minimize the probability of damage to ensure normal operation.
2019, 6(S1): 124-127.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.024
Abstract:
[Introduction] Settlement of buildings and structures is related to construction and safety operation of power plants. In the process of settlement observation, the key to the applicability of the observation method is to solve how to reduce the labor and improve the observation accuracy, is suitable for buildings and structures of power plants. [Method] In this paper, the role, the content and the accuracy requirements for important buildings of power plants were introduced. The advantages and disadvantages of traditional observation methods were analyzed, and the regional positioning technology was introduced. [Result] An automatic and intelligent settlement observation system based on area local positioning is presented, which is suitable for the buildings and structures of power plants. The key problems are solved in the process of the settlement observation system. [Conclusion] With the research applied in practice, the cost is reduced and work efficiency is improved. Furthermore, the means and methods of settlement observation are enriched, especially in small area.
2019, 6(S1): 128-134.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.025
Abstract:
[Introduction] In order to ensure the safe and stable operation of overhead transmission lines, improve the stability and safety of transmission line slope, strengthen the awareness of operation and maintenance personnel of transmission line slope in mountainous areas, and improve the management ability of slope risk. [Method] Taking the 34-grade tower slope of Shenzhen 500 kV Pengshen A-B Line as the evaluation object, combining with the engineering geological research methods and the accumulation of practical experience, a set of risk assessment index system conforming to the characteristics of the transmission line slope is constructed, and the risk grade of the slope is determined; and the corresponding risk control countermeasures and risk grading management measures are formulated. Emergency measures and procedures for dealing with unexpected accidents are proposed. [Result] The results of slope risk assessment corroborate the actual situation of the slope. It can classify the risk grade of the slope simply, efficiently and reasonably. The corresponding risk control countermeasures and grading management measures can effectively reduce the risk of the slope. [Conclusion] The proposed risk assessment methods and risk management ideas basically meet the management needs of transmission line slope, and have great practical value for improving the risk response ability of the operation and maintenance management department of transmission line slope and reducing the risk of transmission line slope.
2019, 6(S1): 135-139.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.026
Abstract:
[Introduction] In order to quantitatively calculate the risk of transmission line tower slope, reasonable measures are taken to manage the tower slope to ensure the safe and stable operation of overhead transmission lines. [Method] Taking a tower slope in Shenzhen as the research object, according to the framework system of slope risk assessment, the direct economic losses caused by slope deformation and failure can be quantitatively calculated through slope failure probability analysis, risk analysis and hazard consequence analysis, combined with the surrounding environmental conditions of the slope. [Result] Through quantitative risk assessment of slope, even if the safety factor satisfies the criterion, the slope still has a failure probability of 4.75%, and the risk assessment value of property loss is 174 000 yuan. [Conclusion] This paper presents and exemplifies a set of quantitative risk assessment methods for transmission tower. The assessment results can provide reference value for the operation and maintenance department of transmission tower slope.
2019, 6(S1): 140-146.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.027
Abstract:
[Introduction] In order to predict settlement and calculate consolidation degree of preloading foundation treatment more accurately, this paper puts forward an Optimal Combined Prediction model on the basis of time series of original cumulative settlement and a method of evaluating the accuracy of the model. [Method] Based on the traditional prediction model, such as Compertz model, grey G (1, 1) model and Pearl model, an Optimal Combined Prediction model (OCP model) was established and the accuracy of all single models and the Optimal Combined Prediction (OCP model) were tested with the monitoring data of foundation settlement at heat-power-cold energy generation system by using natural gas; Meanwhile, the result of the Optimal Combined Prediction model (OCP model) was compared with three-point method, Asaoka method, hyperbolic curves fitting method. [Result] That shows: the accuracy of all single models and optimal combination model reaches the good precision level; Compared with three-point method, Asaoka method and hyperbolic curves fitting method, the calculated value of the Optimal Combined Prediction (OCP model) is closer to the real value. [Conclusion] While predicting settlement and calculating the consolidation degree of preloading foundation treatment, different methods are used, reasonable value of evaluation index about foundation treatment can be obtained. The optimal combination prediction model (OCP model) can provide guidance for preloading foundation treatment construction and controlling process.
2019, 6(S1): 147-152.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.028
Abstract:
[Introduction] To study the deformation characteristics and state of soft foundation treated by plastic drainage plate preloading method before the whole foundation slides and becomes unstable. [Method] Through the comprehensive analysis and study of the monitoring data of pore water pressure, surface water horizontal displacement, deep horizontal displacement of foundation soil and surface subsidence before the integral sliding of revetment foundation. [Result] The results show that the dissipation rate of pore water is far from 70% before the instability of foundation and the load is carried out again. The horizontal displacement rate is 20 mm/d, which is 4 times higher than the control value. [Conclusion] The analysis of the case data can provide technical support and valuable experience for the plastic drainage plate preloading method in soft soil foundation reinforcement with the same or similar conditions.
2019, 6(S1): 153-158.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.029
Abstract:
[Introduction] Since currently unmanned aerial vehicles (UAV) have been widely used in power grid inspections, research and development of the UAV power grid inspection training and evaluation system is to reduce real machine drill errors, reduce the risk of crashes and equipment damage, and train grid inspection personnel with standardized operation and mature techniques. [Method] To meet the actual requirements of the UAV grid inspection, this paper established the virtual geographic information scene and the transmission line operation scene , based on the large visual simulation technology. At the same time, the system was built-in technical guidelines and safety specifications that must be followed by the UAV power line. It could statistically analyze and quantify the training effect of the participants. [Result] The research shows that the machine patrol personnel can participate in the training at any time and at low cost, which can partially replace the real patrol drill training, speed up the training of technical personnel, and adapt to the development needs of the power grid. [Conclusion] The developed UAV Power Grid Inspection Training and Evaluation Simulation System will improve the operation and maintenance inspection personnel′s operational quality of the drones to new level, which has certain reference significance and is worthy of application and deployment.
2019, 6(S1): 159-163,169.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.030
Abstract:
[Introduction] In tecent years, the domestic power market is drying up and competition is intense. Under the condition of low price and high risk, loss of projects cannot be avoided. [Method] This paper analyzed the cost constitution of general contracting, defined the relationship between sales, costs and profit, and putted forward the concepts of "invisible loss and expicit loss" . On the basis of above work, we analyzed the reasons of loss in detail at every stage. At last, we proposed countermeasure for the project loss. [Result] The research shows that contractors should change the past, extensive management, in order to pursuant to the requirements of invitation documents and adapt to the new situation of project management. It is helpful for enterprises to improve anti-risk capability and financial profit. [Conclusion] This paper can also provide guidance for general large engineering project.
2019, 6(S1): 164-169.
doi: 10.16516/j.gedi.issn2095-8676.2019.S1.031
Abstract:
[Introduction] In order to improve the headquarter management of central energy enterprises, the establishment method of quality management system is put forward. [Method] Through the analysis of the central energy enterprise headquarters management status, ISO 9001 standard was applied to refine the process method of forming three major stages and nine key links. [Result] Three stages including planning mobilization, system construction and the feedback of operation. Planning mobilization stage is the preliminary work of quality management system construction, planning quality directly affects the effectiveness of system construction. The system construction stage is the key and difficult stage of the whole proces, which determines the success or failure of the system construction. Operation feedback stage is the test of the effectiveness of system construction and also an important way for improvement. Three stages linked together, and nine links form a complete PDCA cycle. [Conclusion] The application of this method can provide some reference for the central energy enterprise headquarters to establish self-improvement, continuous improvement of quality management system, and form an effective closed loop management. It is also significant to enhance the self-management efficiency of the headquarter of the central energy enterprise, to play an exemplary and leading role, and to promote the overall high-quality development of the group enterprises.
