Smart Meter Voltage Sensing Utilizing Optically Coupled Isolators
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The circuit designs for voltage and current sensing's and electrical isolation are disclosed. In sensible meter system voltage and current sensing, electrical isolation between the excessive voltage and the low voltage domains is critical. These voltages are optically coupled and electrically remoted to the inputs of the low voltage circuits by using optically coupled isolators. "While we share the concern about public safety, we are assured that the cable itself is, as it always has been, protected even if not fully lined by sediment. We share the general public's concern about this visibility, which has been caused by the numerous quantity of sediment that has been lost in the world prior to now several months," National Grid famous. The assertion went on to notice that throughout "the previous yr, we have now performed monthly surveys of the sediment coverage of the cable, which have indicated a big shifting of sediment and loss of sand on Crescent Beach. As previous media experiences have indicated, this fall we plan on putting in further sleeving over another section of cable to protect it from any potential injury from a stray anchor or different heavy object.
"We are aware of the latest reviews that the sea2shore cable and its protecting sleeving are visible, at instances, at low tide on Crescent Beach. Using optically coupled isolators, the sensed voltages within the excessive voltage power lines are optically coupled and electrically isolated to the low voltage circuits. A wise meter system voltage and present sensing are carried out as voltage drops across a shunt resistor in collection with the power line or from a voltage divider related across the power strains. The method contains coupling a resistor voltage divider to a excessive voltage portion of the sensible meter. Circuits for the voltage and present sensing technique are described using resistors and optically coupled isolators. From what we understand, different parts of Block Island are additionally seeing a major loss of sediment as a result of excessive weather. The cable is built to ship a long time of service in excessive submarine circumstances. The present invention is expounded usually to meters for measuring energy and extra notably to a smart meter system. To describe the features of the current invention in additional detail refer now to the following description along side the accompanying Figures.
The next description is presented to enable certainly one of ordinary talent within the art to make and use the invention and is supplied in the context of a patent software and its necessities. Accordingly, many modifications may be made by one in all odd skill in the artwork with out departing from the spirit and scope of the present invention. Although the present invention has been described in accordance with the embodiments shown, one in every of bizarre talent within the art will readily recognize that there may very well be variations to the embodiments and people variations can be throughout the spirit and scope of the current invention. Thus, the present invention just isn't meant to be restricted to the embodiments shown, but is to be accorded the widest scope in step with the rules and options described herein. Various modifications to the popular embodiments and the generic principles and features described herein will be readily obvious to those skilled in the art. By eliminating the transformer the sensible meter might be physically smaller, less expensive and won't be tampered as within the case when the transformer core is positioned in a saturation situation.
The benefits of this transformer-much less methodology as compared to the transformer strategy are direct sensing of present and voltage that permits AC energy and energy measurements for non-resistive masses, tamper proof for secure energy measurements, compact sizes, and low costs. FIG. 6 is an illustration of circuit for voltage sensing transistor in the open collector configuration with a load resistor RL 69. An optical transistor sixty nine has a base terminal B that is optically coupled to the IF LED 66. The emitter terminal E is related to the Vss terminal 71. The collector terminal C is related to the second terminal of a resistor RL sixty nine within the open collector configuration. An optical transistor 12 has a base terminal B that is optically coupled to the IF LED which is a low voltage portion 102. The collector terminal C is linked to the VDD terminal 11. The emitter terminal E is connected to the first terminal of a resistor RL 13 in an emitter follower configuration. An optical transistor 57 has a base terminal B that's optically coupled to the IF LED which is a low voltage portion 102. The collector terminal C is connected to the VDD terminal 56. The emitter terminal E is related to the primary terminal of a resistor RL 58 within the emitter follower configuration.