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                  直流电流信号隔离器的工作原理及技术特点(最

                  日期:2019-07-02 08:31
                  直流电流信号隔离器是将输入单路或双路电流或电压信号,变送输出隔离的单路或双路线性的电流或电压信号,并提高输入、输出、电源之间的电气隔离性能。
                    
                    在工业生产过程中实现监视和控制需要用到各种自动化仪表、控制系统和执行机构,它们之间的信号传输既有微弱到毫伏级、微安级的小信号,又有几十伏,甚至数千伏、数百安培的大信号;既有低频直流信号,也有高频脉冲信号等等,构成系统后往往发现在仪表和设备之间信号传输互相干扰,造成系统不稳定甚至误操作。出现这种情况除了每个仪表、设备本身的性能原因如抗电磁干扰影响外,还有一个十分重要的因素就是由于仪表和设备之间的信号参考点之间存在电势差,因而形成“接地环路”造成信号传输过程中失真。因此,要保证系统稳定和可靠的运行,“接地环路”问题是在系统信号处理过程中必须解决的问题。
                    
                    解决“接地环路”的方法根据理论和实践分析,有三种解决方案:
                    
                    种方案:所有现场设备不接地,使所有过程环路只有一个接地点,不能形成回路,这种方法看似简单,但在实际应用中往往很难实现,因为某些设备要求必须接地才能保证测量精度或确保人身安全,某些设备可能因为长期遭到腐蚀和磨损后或气候影响而形成新的接地点。
                    
                    第二种方案:使两接地点的电势相同,但由于接地点的电阻受地质条件及气候变化等众多因素的影响,这种方案其实在实际中无法完做到。
                    
                    第三种方案:在各个过程环路中使用信号隔离方法,断开过程环路,同时又不影响过程信号的正常传输,从而彻底解决接地环路问题。
                    
                    直流电流信号隔离器采用了先进的数字化技术,在对高、低频干扰信号的抑制方面均有着优异表现,即使在大功率变频控制系统中依然能够可靠应用,内部采用数字化调校、无零点及满度电位器、自动动态校准零点、温度漂移自动补偿等诸多先进技术,并符合IEC61000-4-4:1995中所规定的第四类(恶劣工业现场)环境对产品的抗电磁干扰要求,这一系列技术的应用使产品的稳定性及可靠性得到科学的保证。
                    
                    直流电流信号隔离器可以与单元组合仪表及DCS、PLC等系统配套使用,在油田、石化、制造、电力、冶金等行业的重大工程中有着广泛应用。
                  Energy saving and consumption reduction, emission reduction and low carbon economy have become a long-term development trend, which has also led to a number of high-speed development industries. For example, wind power, nuclear power, smart grid, high-speed trains and rail transit, these industries put forward new requirements for instrumentation.
                   
                  In order to achieve the goal of energy saving and emission reduction, it is necessary to accurately collect, measure and real-time monitor and analyze energy resources, and control the load. This requires that instruments, especially energy metering instruments and power automation management system products have the characteristics of high intelligence, network and reliability.
                   
                  Although the products of many instrument suppliers can not directly produce low-carbon benefits, the suppliers themselves can provide advanced instruments to improve the production efficiency of users, improve product quality, monitor emissions, and contribute to the low-carbon economy.
                   
                  China's instrument industry is still in a weak stage of overall strength, we should pay attention to the promotion of product technology content. Among them, one of the most important directions is the intellectualization of products. Intelligent industry is a low-carbon economy with advanced technology, which is in line with the current overall economic development direction. However, it is the basic industries such as instruments and instruments that are the weakest and most in need of development in the field of intelligence in China. The advance of intelligent industry depends on the progress of basic industries such as production instruments and instrumentation. Therefore, the instrumentation industry should seize the current opportunities and strive to develop new instrumentation products needed by new industries.
                   
                  "Low Carbon Economy" Needs "Low Carbon Technology" to Support
                   
                  "Low-carbon economy" means the adjustment of energy structure, industrial structure and technological innovation, and promotes the development and growth of a series of industries. The major support of low-carbon economy is "low-carbon technology". Without the guidance of advanced science and technology, there will be no vigorous development of low-carbon economy. Low-carbon technology involves power, transportation, construction, metallurgy, chemical and petrochemical sectors, as well as new technologies for effective control of greenhouse gas emissions developed in renewable energy and new energy sources, clean and efficient utilization of coal, exploration and development of oil and gas resources and coal-bed methane, carbon dioxide capture and storage and other fields.
                   
                  Transition to a low-carbon economy is the general trend of the energy industry. High-energy-consuming equipment will not meet the needs of future energy development. How to effectively apply advanced technology to equipment is a problem that instrument enterprises must consider. The trend of low carbon economy brings not only opportunities but also more severe challenges to instrument industry. For instrument and instrument enterprises, whether to grasp low-carbon technology is not whether to seize the business opportunities brought by low-carbon economy, but whether to survive. At this time, the instrumentation industry, such as sailing against the water, will go backwards if it does not advance. Enterprises with low-carbon technology not only seize business opportunities but also maintain their market position. On the contrary, they will not only miss opportunities, but also be eliminated from the market.
                   
                  In this case, any enterprise that does not keep up with the situation and lacks new technology will be engulfed by the market tide; and the enterprise that knows how to judge the situation and grasp advanced technology first will be favored by the market. In a word, keeping up with the development of science and technology and grasping the key technologies are what instrument and instrument enterprises should and must do in the transformation of low-carbon economy.

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                  无源隔离器有几种工作形式?2019-07-19 信号隔离器的两个核心应用场所2019-07-16
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