电能表事件主动上报和通讯模块互换能力测试研究

事件记录功能和通讯模块互换能力作为智能电能表的重要功能,主要承担着及时反映、实时记录和有效保存各类事件内容或故障信息以及保障多种通信接口通用性和互换性的职责。现介绍目前国家电网公司智能电能表功能规范中所定义和设置的事件记录功能及通信模块互换能力测试内容,并结合两种试验的方法和过程,分别从实用性、统一性和完整性三个方面对当前智能电能表的事件记录功能和通讯模块互换能力测试进行分析和探讨,最后根据智能电能表发展趋势,对这两种功能的拓展进行了展望。

柔性版印刷机

欧米特 Varyflex-F1多工艺组合柔性版生产线欧米特 Varyflex-F1多工艺组合柔性版印刷生产线为 Varyflex的升级版机型,采用无轴设计及套筒技术增强了联机组合工艺的灵活性。F1具有各种不同单元插件的灵活互换能力,网印、凹印、全息定位烫等都可以做到任意位置。对于传统的联机工艺,如冷烫印、复合,以及背面印刷也有一些改进。

Numerical Study of Thermoelectric Generation within a Reciprocal Flow Porous Media Burner

A numerical study based on direct thermal to electric energy conversion was performed in a reciprocal flow porous media burner embedded with two layers of thermoelements. The burner lean combustibility limit was sought in order to maximize global efficiency of thermal to electrical energy conversion by minimizing fuel consumption. Once the pairs of operational variables, composition and filtrational velocity of gas inlet mixture were found, the optimal length and placement of thermoelectric elements within the reactor high thermal gradients were sought to maximize the electric current, thermoelements and system overall efficiency. A two temperature-resistance model for finite time thermodynamics was developed for the thermoelectric elements energy fluxes. Results indicate a distribution of current and efficiencies that presents a maximum at different themoelements length. Maximum values for current and system efficiency obtained were 44.3 m A and 2.5%, respectively.