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 good meter system voltage and present 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 through the use of optically coupled isolators. "While we share the concern about public safety, we're assured that the cable itself is, because it all the time has been, protected even if not fully covered by sediment. We share the general public's concern about this visibility, which has been caused by the significant quantity of sediment that has been misplaced in the world up to now a number of months," National Grid noted. The assertion went on to notice that during "the past yr, now we have conducted monthly surveys of the sediment protection of the cable, which have indicated a big shifting of sediment and lack of sand on Crescent Beach. As earlier media stories have indicated, this fall we plan on putting in additional sleeving over one other part of cable to protect it from any potential injury from a stray anchor or different heavy object.

"We are conscious of the recent experiences 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 in the high voltage energy lines are optically coupled and electrically isolated to the low voltage circuits. A sensible meter system voltage and present sensing are carried out as voltage drops across a shunt resistor in sequence with the facility line or from a voltage divider related across the facility traces. The strategy contains coupling a resistor voltage divider to a high voltage portion of the good meter. Circuits for the voltage and current sensing method are described using resistors and optically coupled isolators. From what we perceive, other parts of Block Island are also seeing a significant loss of sediment as a result of extreme weather. The cable is constructed to ship a long time of service in excessive submarine circumstances. The present invention is related typically to meters for measuring power and extra significantly to a sensible meter system. To explain the options of the current invention in additional element refer now to the next description along side the accompanying Figures.

The following description is introduced to allow considered one of peculiar ability 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 could also be made by one among ordinary ability within 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 shown, one among extraordinary talent within the artwork will readily recognize that there could be variations to the embodiments and those variations can be inside the spirit and scope of the present invention. Thus, the current invention is not meant to be limited to the embodiments shown, but is to be accorded the widest scope in step with the principles and features described herein. Various modifications to the preferred embodiments and the generic principles and options described herein will be readily apparent to these expert within the art. By eliminating the transformer the sensible meter will be bodily smaller, less costly and won't be tampered as in the case when the transformer core is positioned in a saturation situation.

The advantages of this transformer-less methodology as in comparison with the transformer strategy are direct sensing of current and voltage that enables AC energy and power measurements for non-resistive loads, tamper proof for secure power 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 is optically coupled to the IF LED 66. The emitter terminal E is linked to the Vss terminal 71. The collector terminal C is related to the second terminal of a resistor RL 69 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 related to the VDD terminal 11. The emitter terminal E is linked 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 linked to the VDD terminal 56. The emitter terminal E is connected to the primary terminal of a resistor RL fifty eight in the emitter follower configuration.