0.5mT工频磁场下防止电子式电能表启动设计

正1背景国网2013年新标准《单相智能电能表技术规范》对0.5mT工频磁场无负载要求:电能表处于工作状态,电流线路无电流,将其放置在0.5mT工频磁场干扰中,电能表的测试输出不应产生多于一个的脉冲。测试方法:0.5 mT工频磁场试验装置产生磁场的电流应与施加在电能表上的试验电压相同频率产生,试验装置可以调节穿过电能表的磁力线方向,也可以调节发生磁场电流与电能表施加电压的夹角。通过改变磁力线方向和电压电流夹角寻找电能表受工频磁场影响最敏感点,在该点进行无负载测试。     

关于电能表

一、电能表的基础知识1.作用电能表又叫电度表,主要用来测量用电器在一段时间内消耗的电能多少.用电时,中间的铝制圆盘转动,上面的计数器就以千瓦时为单位来显示已用的电     

如何正确读“啊”

“啊”是一个表达语气和感情的助词。它不同于一般的助词,单用在句子开头,是叹词,应该读本音“a”,但是它的声调是根据说话人的感情变化而变化的;“啊”在句的末尾,用来表示语气,由于受到前面音节的最后一个音素的影响,读音往往发生变化。     

用于高压电子式电流互感器的能力和数据复合光纤传输系统

This paper describes a prototype power delivery system developed for high voltage electronic current transformer (ECT) that uses laser light to transfer power to and communicates with the primary converter. The design is based on optical-to-electrical power converters, solid-state diode lasers and optical fibers. Command signals are transmitted via the same up-fiber used to send power from secondary power supply to primary converter. The upward data transmission is completed during the brief interruption of power delivery without affecting steady power-supply. A simple comparator added to the primary converter can take the command data. Experimental results show that the fibers can provide reliable up-link for data transmission at 200 kb/s from the secondary to the primary converter. Based on the delivery system, the secondary converter can control three auxiliary channels to provide additional information. These monitoring channels are used in a time-multiplexing mode to provide information about the operation temperature, voltage and current at the remote unit for monitoring the ECT. This preventive maintenance or built-in test can increase reliability by giving early warning for necessary maintenance request.     

潮州古建筑术语英译的矛盾处理

由术语翻译视角厘清潮州古建筑术语英译单用与联结、继承与创新、物质与精神的矛盾。计量古建筑英译研究文章发现译法结合、注释、图片的作用。以平衡归化与异化的策略可以处理潮州古建筑术语英译矛盾：古建筑术语单用时宜采用音译+直译，术语条目解释可加入图片，联结时应根据不同文本采用直译或音译+直译，并巧用注释；古建筑术语英译可以分为直接继承现存译名，部分创造与部分继承并存的直译+现译名以及创造性直译，必要时辅以意译；物质与精神矛盾处理一般采用直译+现译名，必要时辅以意译，同时灵活运用连字符、移形译与词类增译。