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Cangzhou Bohai New Area is a administrative region that set up newly. the stock of power grid is small, and load develops fastly. In this paper a industrial block and a block of residence in the Bohai New Area, the smallest annual cost method used to calculate the different voltage sequence of the smallest in the cost of the program, argues that the best medium voltage distribution network voltage...
The electric power distribution automation develops very quickly nowadays. It is also an integrated technology with the Communications technology, especially the wireless Communications. The application of 3G, WiMAX, UWB, etc. provides a new view on the development of electric power automation. The paper introduces a new view on the planning of electric Private Access Network by WiMAX technology and...
The harmonic levels in 220 kV Gong Ping power station are much higher above the standard because of the load of the electric railway traction substation. Voltage pollution was serious and the substation was long-running in the state of unqualified voltage, it is necessary to install filtering equipment. In this paper, measures of the harmonic suppression are put forward, which are reasonably choosing...
Calculating the power loss of amorphous core transformer (AMT), S11 and S7 type distribution transformers in the same capability, and comparative analysis the economic benefits between AMT and S11 type transformer. It can be concluded that the effect of energy-saving of AMT is superior to the energy-saving effect of S11 type distribution transformers, and if replace the S7 type transformer by AMT...
Along with the development and application of new wireless communication technologies, it is becoming a new hotspot to research and construct wireless communication systems fit for distribution power automation systems (DPAS). Mobitex is a kind of narrow-band packet-switch data communication technology, which is suitable for paroxysmal data transmission. The characteristics of Mobitex technology include:...
The situation at electric arc furnace factory is always severe containing voltage fluctuation and flicker, three-phase imbalance and low power factor. The dynamic var compensator is a good solution to this condition. The static var compensator (SVC), with its continuously variable compensation, also safeguards the plant against overcompensation during furnace outages. The SVC equipment, offered by...
The paper will discuss the new dispatch methodology of power grid. The power grid's new goal is saving and emmission controlling. According to the new conception, the tranditiongal dispacth method will be changed. It is important that study on conpetition dispatch of power grid about energy efficiency in the generator companies.
Line-loss management is a complex and systematic project. This paper analyses the feature of scientific quality management system, which is systematic, standardized, scientific, and operable, sustainable and comprehensive. Combined with the practice of the line-loss management, this paper proposes the establishment of a scientific management system in line with the characteristics of line-loss management...
This paper analyzed the specialty of LM system based on GPRS/CDMA. The shortage of security scheme used in LM system in safety zone I/II was discussed. The reduced possibility of the safety demand is presented also. A new safety scheme in safety zone III is designed. The new scheme was more simple and it improved the safety capability of the control zone I/II more effectively.
Bus protection is important to the steadly operation of grid, according to countermeasure requirement of relay protection, the bus differential protections upwards 220 kV degree must be duplicated, but the work of bus protection duplex configuration reconstruction relate to wide ranged, complex technique and excessive danger points. This paper analyzes the attentive safety, technology, experimentation,...
The neutral grounding mode selection of distribution is one of the concernful problems faced in the modification of distribution. This paper researches and analyzes the three different neutral grounding modes of ungrounded-neutral mode, neutral Peterson coil grounding mode and neutral resistance grounding mode respectively. The selecting schemes of neutral grounding mode to different grid structure...
This paper advocates that cable lines should be used in the urban network planning of important areas such as the urban center etc. The urban network structures which can tolerate ice storm are formed by ice storm tolerated designing and planning. The source problems of urban networks in ice storm are solved by involving the distributed energy resources (DES) based microgrid. The requirements of the...
The moisture distribution in the transformer and variation mechanism of moisture in oil is analyzed in this paper, and using relative saturation and temperature as characteristic parameters, a detail scheme of online moisture content monitoring in transformer oil is put forward. The polyimide-based capacitive humidity sensor and temperature sensor are employed in online monitoring moisture content...
Power transformer is a complicated system due to its stochastic, fuzzy and alterable behavior. It is a decision-making problem of engineering system to assess transformer behavior. Qualitative knowledge and quantitative data need to be integrated. Quantitative change and qualitative change all need be reflected in the assessment results of transformer behavior. The behavior of whole transformer system...
It is based on welding machine to present a method for improving power factor of the electrical products and influence, especially to raise the power factor with coil products. The main principle is shown as following: the primary and secondary windings of electrical product respectively around the same core of the two different cores column, the reactance coil windings wind the core columns of once...
Builds a GM(1,1) grey forecasting model to find out the fluctuating trend of the historical data series, then builds a Markov transition matrix to find out the transition probability, finally combining these two models to forecast the power requirement accurately by the historical time series data.
As the market environment has been changed by power system reform, power supply enterprises have to improve their management efficiency to reduce cost. Equipment maintenance management was a problem of pure technology. And now it is being transformed into a balance of cost and benefit. In this paper a method called status-based maintenance (SBM) is proposed, and it helps to make plans of equipment...
With the using of the renewable sources increasingly, application of the distributed generation (DG) in the distribution system acquired more attention. After the power system faults, distribution system which contains many DGs would usually cut off the DGs from the distribution system at the joint where the DGs connected into the system term less. However, considering the enlarge scale and the capability...
This paper has effectively combined self-study advantage of adaptive neural network and fuzzy reasoning method of fuzzy math, resolved the problem that the fuzzy rule is difficult to be determined in the fault diagnosis for transformer insulation, confirmed the fuzzy rule and the fuzzy subject degree by using self-study function of adaptive neural network and established ANFIS model of transformer...
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