Smart Meter Voltage Sensing using Optically Coupled Isolators > 자유게시판

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The circuit designs for voltage and current sensing's and electrical isolation are disclosed. In good meter system voltage and current sensing, electrical isolation between the excessive voltage and the low voltage domains is necessary. These voltages are optically coupled and electrically isolated to the inputs of the low voltage circuits by utilizing optically coupled isolators. "While we share the concern about public security, we're assured that the cable itself is, because it all the time has been, protected even if not absolutely coated by sediment. We share the general public's concern about this visibility, which has been brought on by the numerous quantity of sediment that has been lost in the realm prior to now several months," National Grid noted. The assertion went on to notice that during "the previous 12 months, we have 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 earlier media studies have indicated, this fall we plan on putting in extra sleeving over one other part of cable to protect it from any potential damage from a stray anchor or other heavy object.

"We are aware of the latest reports that the sea2shore cable and its protective sleeving are seen, at instances, at low tide on Crescent Beach. Using optically coupled isolators, the sensed voltages within the excessive voltage power strains are optically coupled and electrically remoted to the low voltage circuits. A sensible meter system voltage and present sensing are performed as voltage drops throughout a shunt resistor in collection with the facility line or from a voltage divider related across the ability strains. The tactic includes coupling a resistor voltage divider to a high voltage portion of the smart meter. Circuits for the voltage and current sensing methodology are described utilizing resistors and optically coupled isolators. From what we understand, different components of Block Island are also seeing a major lack of sediment due to excessive weather. The cable is constructed to ship decades of service in excessive submarine conditions. The present invention is said typically to meters for measuring power and extra notably to a smart meter system. To explain the options of the current invention in more element refer now to the following description in conjunction with the accompanying Figures.

The next description is introduced to enable one among peculiar skill in the artwork to make and use the invention and is provided within the context of a patent application and its requirements. Accordingly, many modifications may be made by considered one of peculiar ability in the art with out departing from the spirit and scope of the present invention. Although the present invention has been described in accordance with the embodiments proven, considered one of abnormal talent in the art will readily acknowledge that there may very well be variations to the embodiments and those variations could be throughout the spirit and scope of the current invention. Thus, the current invention is not supposed to be limited to the embodiments shown, however is to be accorded the widest scope consistent with the rules and features described herein. Various modifications to the preferred embodiments and the generic rules and features described herein will likely be readily apparent to these skilled in the artwork. By eliminating the transformer the smart meter will be physically smaller, much less costly and will not be tampered as in the case when the transformer core is positioned in a saturation condition.

The benefits of this transformer-less method as in comparison with the transformer approach are direct sensing of present and voltage that permits AC energy and vitality measurements for non-resistive loads, tamper proof for secure energy measurements, compact sizes, and low costs. FIG. 6 is an illustration of circuit for voltage sensing transistor within the open collector configuration with a load resistor RL 69. An optical transistor 69 has a base terminal B that's optically coupled to the IF LED 66. The emitter terminal E is connected to the Vss terminal 71. The collector terminal C is connected to the second terminal of a resistor RL 69 within the open collector configuration. An optical transistor 12 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 11. The emitter terminal E is related to the primary 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 linked to the VDD terminal 56. The emitter terminal E is related to the first terminal of a resistor RL 58 within the emitter follower configuration.