Abstract: With the continuous development of China's economy in recent years, the market increasingly competitive. To the intense competition in the market place, each firm must strictly control their own costs. For enterprises, cost control, not just a financial concept, it is a strategic concept. For enterprises, the procurement cost of the general account for 50% of business costs. Procurement cost control in the enterprise study, first of all to make people understand the importance of procurement costs, followed by the status of procurement costs in China were analyzed, the last big Shao enterprise procurement cost control, the main channels and other aspects of the case study. Through different methods, different angles, will be doing business purchasing cost control more complete. Truly enterprise procurement cost control all aspects of the implementation of the enterprise. Key words: Purchasing; cost; control

In the modern in power system, electric power equipment numerous, and various components operation complex, it is easy to appear all sorts of forms of electrical fault, so the relay protection measures must be taken to make the system more stable operation. This paper is to 110 KV power grid to relay protection research and design. This paper according to the characteristics of the power grid the generator, transformer parameters and the setting calculation, through the calculation results confirmed the CT/PT models. Meanwhile, in the paper, the possible all forms of short-circuit current for a detailed calculation. According to this short circuit current parameters, the design adopted phase spacing protection and zero sequence current protection two kind of relay protection measure.But because of the relay protection device may be because of its own defects misoperation, so in this design has also used the automatic reclosing technology, through the automatic reclosing device can reduce this error action as much as possible, so that the whole power system can be more stable operation.希望里边的句子能对你有帮助，可以自己修改下，我也是找人帮你翻译的，望采纳！！