Smart Meter Voltage Sensing Utilizing Optically Coupled Isolators > 자유게시판

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The circuit designs for voltage and current sensing's and electrical isolation are disclosed. In smart meter system voltage and present sensing, electrical isolation between the high voltage and the low voltage domains is critical. These voltages are optically coupled and electrically isolated to the inputs of the low voltage circuits through the use of optically coupled isolators. "While we share the concern about public safety, we are confident that the cable itself is, because it at all times has been, safe even if not absolutely covered by sediment. We share the general public's concern about this visibility, which has been brought on by the significant amount of sediment that has been misplaced in the world prior to now several months," National Grid noted. The statement went on to notice that throughout "the previous 12 months, we have now conducted month-to-month surveys of the sediment coverage of the cable, which have indicated a major shifting of sediment and loss of sand on Crescent Beach. As previous media studies have indicated, this fall we plan on putting in extra sleeving over one other section of cable to protect it from any potential harm from a stray anchor or different heavy object.

"We are aware of the current studies that the sea2shore cable and its protective sleeving are seen, at times, at low tide on Crescent Beach. Using optically coupled isolators, the sensed voltages within the high voltage energy strains are optically coupled and electrically remoted to the low voltage circuits. A smart meter system voltage and present sensing are performed as voltage drops throughout a shunt resistor in series with the power line or from a voltage divider connected throughout the power strains. The strategy contains coupling a resistor voltage divider to a high 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 perceive, other parts of Block Island are also seeing a major loss of sediment as a result of extreme weather. The cable is constructed to ship decades of service in extreme submarine conditions. The current invention is said usually to meters for measuring energy and extra notably to a sensible meter system. To describe the options of the present invention in more detail refer now to the following description along side the accompanying Figures.

The next description is presented to allow one among peculiar talent in the art to make and use the invention and is offered within the context of a patent application and its requirements. Accordingly, many modifications could also be made by considered one of unusual ability in the artwork without departing from the spirit and scope of the present invention. Although the current invention has been described in accordance with the embodiments proven, one of atypical ability within the artwork will readily acknowledge that there might be variations to the embodiments and people variations would be throughout the spirit and scope of the current invention. Thus, the current invention shouldn't be meant to be limited to the embodiments proven, however is to be accorded the widest scope according to the rules and features described herein. Various modifications to the popular embodiments and the generic principles and features described herein shall be readily apparent to those skilled within the artwork. By eliminating the transformer the good meter might be physically smaller, less pricey and is not going to be tampered as in the case when the transformer core is placed in a saturation situation.

Some great benefits of this transformer-much less technique as in comparison with the transformer approach are direct sensing of current and voltage that permits AC energy and power measurements for non-resistive hundreds, tamper proof for safe energy measurements, compact sizes, and low prices. 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's optically coupled to the IF LED 66. The emitter terminal E is related to the Vss terminal 71. The collector terminal C is linked to the second terminal of a resistor RL sixty nine in 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 related to the VDD terminal 11. The emitter terminal E is related to the first terminal of a resistor RL thirteen in an emitter follower configuration. An optical transistor 57 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 related to the VDD terminal 56. The emitter terminal E is connected to the primary terminal of a resistor RL 58 in the emitter follower configuration.