With the rapid development of the electric power industry in our country,new relay protection equipments especially microprocessor relay protection equipments have been widely applied in power system,which has a higher and newer requirement to the corresponding relay testing technology. The exploration and application of microprocessor relay protection testing equipment have a great active significance to improve relay testing level, prevent incorrect action of relay protection and automation equipments and ensure the safety operation of electric network. In the paper,the structure and principle of the whole testing system are introduced,the hardware and software of the microprocessor relay protection testing equipment are designed based on modular structure method. The designing rule and the programming method of the whole software are also set.
Fifty-nine samples of atmospheric precipitation were collected at Yunfu, Western Guangdong province during the period of April 5, 2005 to April 1, 2006 and their oxygen isotopic compositions were analyzed. Results show that delta18O values range from -12.47 per thousand to -0.18 per thousand with an average of -4.91 per thousand; the delta18O values of summer and autumn (from May to September) are relatively lower, ranging from -10.00 per thousand to -5.00 per thousand with an average of -6.30 per thousand; the delta18O values of winter and spring (from October to next April) are relatively higher, ranging from - 3.00 per thousand to - 1.00 per thousand with an average of - 2.20 per thousand. These delta18O values have relatively marked negative correlation with the corresponding temperatures and water vapour pressure and their coefficients are both -0.60; but they have had negative correlation with the precipitation amount, the coefficient is -0.33. Comparing with the monthly delta18O value of Guangzhou atmospheric precipitation, those of Yunfu City is relatively lower, maybe the reason is that Yunfu City is influenced by stronger South-West Asian Monsoon. The results of HYSPLIT back trajectory analysis indicated that the differences of delta18O values are determined by different water vapour sources during the pre-rainy season (from April to June), post-rainy season (from July to September) and non-rainy season (from October to next April), so the delta18O values can be considered as an indicator of denoting their water vapour sources, relatively higher delta18O values denote the water vapour sources are denaturalized tropical hot air mass located in the subtropical sea areas (including the South China Sea), western Pacific Ocean; relatively lower delta18O values indicate denaturalized tropical hot air mass from the India Ocean and Bengal Gulf.
This research aims at a study of the hybrid flow shop problem which has parallel batch-processing machines in one stage and discrete-processing machines in other stages to process jobs of arbitrary sizes. The objective is to minimize the makespan for a set of jobs. The problem is denoted as: FF|batch1, sj|Cmax.
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