The very best Solution to Low Voltage Power Line > 자유게시판

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A sensible meter system voltage and current sensing are carried out as voltage drops across a shunt resistor in sequence with the ability line or from a voltage divider related throughout the power strains. A transformer-much less technique and system for voltage and current sensing utilizing voltage drops throughout resistors is disclosed. The good meter system 50 is a many-to-one data communication topology. In this embodiment, the native server 1 points a command to the coordinator 2 which executes the command by sending a corresponding knowledge packet wirelessly to the good meters three by a radio frequency (RF) hyperlink, e.g. ZigBee that will or could not support an business customary reminiscent of IEEE 802.14.5. Then the sensible meters three ship an acceptable response again to the coordinator 2 by the identical RF hyperlink. In another embodiment, the local server 1 is related to the coordinator 2 wirelessly. The power utilization can be accessed for instance by displaying web pages using any system that's linked to the local server or the internet. The native server 1 points commands to the coordinator 2 by way of a coordinator-server interface management register.

For instance, an F-01 error code factors towards a predominant digital management board failure, which can require alternative of the main digital management board. On a Maytag dryer, a PF error code signifies a power failure, an AF error code signifies restricted air flow and an L2 code signifies low or no line voltage. Cite:Bochuan Wang, Xixiu Wu, Zhuqing Xia, Xin Yang, and Zhining Yang, "Research on the Characteristics of the Low Voltage Power Line Carrier Communication Channel," Journal of Advances in Computer Networks vol. FIG. 7 is an illustration of circuit for voltage and present sensing for the emitter follower configuration for a 3-phase energy line utility. The losses on a transmission line are proportional to the present flowing on the road, so transmitting at excessive voltage (and hence low present) is helpful because it reduces the quantity of power that's lost on account of resistance in the road itself. These voltages are optically coupled and electrically isolated to the inputs of the low voltage circuits by using optically coupled isolators. Using optically coupled isolators, the sensed voltages within the high voltage power strains are optically coupled and electrically remoted to the low voltage circuits. Furthermore, the price of resistors and isolators are much less as compared to that of the transformers.

The system and technique have to be easily carried out, value efficient and adaptable to current methods. FIG. 1 is an illustration of good meter system. There is a necessity to boost system performance, reliability, testability and manufacturability of the good meter throughout the product production and prototyping. In good meter system voltage and current sensing, electrical isolation between the high voltage and the low voltage domains is important. FIG. 2 is an illustration of a smart meter in accordance with an embodiment. In so doing, resistors might be utilized to offer the present or voltage sensing properties of the smart meter. The battery backup 36 enables the detection of power failure in the smart meter 3. The status of the battery backup 36 is reported within the Status register. The benefits of this transformer-much less methodology as in comparison with the transformer strategy are direct sensing of present and voltage that allows AC energy and vitality measurements for non-resistive hundreds, tamper proof for safe energy measurements, compact sizes, and low costs. Audio transformers are commonly used to interconnect professional audio techniques components. Another advantage of using resistors and optically coupled isolators is the truth that voltage and current sensing's cannot be tampered as in the case of transformers by putting a powerful exterior magnets within the shut proximity as to saturate the transformer cores.

The circuit designs for voltage and current sensing's and electrical isolation are disclosed. There are three kinds of potential transformers: optical, capacitor and electromagnetic transformers. The electromagnetic and capacitor transformers are each designed for greater voltage purposes. Potential transformers are used to observe single-part and three-part energy line voltages in power metering functions. The power usage may also be analyzed to allow system management, e.g. minimize off the ability if necessary. FIG. 1 is an illustration of the smart meter system 50 in accordance with an embodiment. FIG. Three is an illustration of circuit design for a current sensing portion of voltage and present sensors 39 in the good meter three of FIG. 2 for a single-section energy line system. The smart meter 3 contains a energy supply 35, a battery backup 36, a liquid crystal show or LCD display 37, a RF controller System-on-Chip (SOC) 38, and voltage and present sensors 39. The battery backup 36 supplies a non-interruptible energy provide in the event of a power failure. The first terminal of a small shunt resistor RS 7 is linked in collection with the recent line of power line pair 6 which is a excessive voltage portion 100; the other energy line 5 is the neutral or floor line.