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In order to grasp the current status, problems and service weaknesses of automobile inspection and testing services, and to propose service improvement and optimization measures. Five criteria-level indicators and corresponding 14 subdivision indexes of automobile inspection and testing service evaluation index system were established. Through the AHP-fuzzy comprehensive evaluation method of automobile inspection and testing service evaluation model, the index weights are determined and the current status of the automotive inspection and testing service is comprehensively evaluated. The weight ranking of the service indicators is professionalism(B3)>economy(B2)>convenience(B1)>transparency(B5)>comfort(B4), the top three items in the order of the weight of all items are technical interpretation, cost of delay and dress & language. According to the comprehensive evaluation, the total score of the automotive inspection and testing service is 90.65, and the index evaluation score of the criterion layer is ranked as B1>B4>B3>B2>B5, according to 5 levels of service satisfaction reviews and evaluations The total score shows that the service evaluation is generally at a satisfactory level, and the scores of convenience, comfort, economy and other indicators are also above the satisfaction line (>85), this shows that in recent years, the reform of inspection and testing services aimed at reducing costs and increasing efficiency and improving testing services has achieved certain results. For specific indicators, it is proposed that the professional capacity building of inspection and testing services should be continuously strengthened, and the technical interpretation to customers and the level of standardization and standardization of external services should be emphasized, and the information management of inspection and testing services should be strengthened as well.

Automobile maintenance information can provide detailed and accurate guidance for diverse, intelligent and complicated automobile maintenance. This paper summarizes the idea of compiling automobile maintenance information. At the same time, it summarizes the 7 basic elements, and introduces the expression methods and requirements according to the elements. Which provides guidance for the preparation of maintenance information that is easy to check, easy to read, complete and can guide the depth of maintenance operations. Finally, it is beneficial to improve the quality and efficiency of information compilation.

With the rapid increase in power loads, power supply capacity plays a significant role in power distribution network. However, attributing to the tremendous differences in regional economic development and diversified characteristics of power distribution network, power supply capacity should be evaluated based on regional differences to better promote the efficiency of distribution network. In this paper, the evaluated indexes including supply capacity reserve, supply capacity margin and supply capacity balance are defined, and the evaluated models for single and inter-layer equipment are established. Furthermore, a case study with ten different regions is employed to validate the proposed models. Results illustrate that considering the effects of “N-x” criterion, network structures and overload features, the proposed comprehensive models could quantitatively evaluate the supply capacity and offer better supports for planning and operation of large-scale power distribution network.

In this paper, the velocity field of EHV power transformer oil has been calculated in one step and two step section pipe models. As a result of these calculations, the optimal configuration of the oil inlet is determined to be that of a fluted cone. >

The influence of corona discharge on streaming electrification by flowing transformer oil has been studied by means of a test model. The polarity effect of the charge density in the oil under applied DC voltage has been analyzed. When AC voltage is applied to the needle electrode of the needle-ring electrode system, the charge density in the transformer oil increases with increase of the amplitude of the AC voltage. When DC voltage is applied the polarity effect of the charge density occurs in the transformer oil, that is, when the DC voltage is of positive polarity, the charge density in the oil keeps increasing all the time. However, when the DC voltage is of negative polarity, the charge density in the oil changes from positive polarity at lower DC voltage to negative polarity at higher DC voltage. The test results obtained are useful for the design, manufacture, and operation of large power transformers with forced circulating oil cooling. >