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Electrical power is transmitted over high voltage transmission lines, medium voltage distribution, and inside buildings at lower voltages. Power line communications can be applied at each stage. Most PLC technologies limit themselves to one particular set of wires (for example, premises wiring), but some systems can cross between two levels (for example, both the distribution network and premises wiring).
All power line communications systems operate by impressing a modulated carrier signal on the wiring system. Different types of power line communications use different frequency bands, depending on the signal transmission characteristics of the power wiring used. Since the power wiring system was originally intended for transmission of AC power the power wire circuits have only a limited ability to carry higher frequencies. The propagation problem is a limiting factor for each type of power line communications.
PLC allows the monitoring and the ability to control data to communicate over power lines. Utility providers in Europe, Asia and the US have realized the importance of the real- time monitoring of power consumption and the need for indicative billing information and options for their customers. In addition, utility providers are seeking ready access to all potential customers in convergence with the growing trend toward deregulated markets.
By integrating Intelligent Automatic Meter Reading (AMR) devices, utility companies are able to generate consumer bills with greater efficiency, as well as provide data to consumers. Real-time consumption throughout the energy grid can also be monitored real-time by utility companies.
PLC provides a low cost solution meter reading and additional functionality with remote connect disconnect, demand caps and load profiling resulting in reduced theft and improved efficiencies. Advanced Meter Infrastructure (AMI) is taking AMR one step further and allows the Utility provider the additional options of having access to the customers load control through smart appliances to deliver improved economies in their distribution networks and augmenting capital infrastructure upgrades and improved system security. Retailers can also offer demand cap, load control and load shedding tariffs to the consumers to improve their returns on wholesale hedges and generation.
The universal characteristic of the Semitech technology is that this innovative solution enables a device to communicate through existing power lines or standard electrical wiring, whether the device is an electricity meter, a machine used in a factory, or a component of a home automation or security system. This method of transmitting data significantly reduces the cost of hard wiring communications to such devices.
Their PLC technology utilises and operates seamlessly with globally accepted communication protocols and standards. The Semitech solution differs from competitors products in that it provides reliable and flexible solution with high data throughput for customers.
Semitech’s solution enhances the reliability and functionality of established systems currently using several interfaced technologies to achieve similar functionality. SIMAC provides a simple cost-effective hardware solution replacing multiple semiconductors and/or extensive software. The chip utilises well-established protocols; ANSI/EIA 709.1 and ANSI/EIA 709.2, each of which already has millions of users globally. STALON / SIMAC combines price, performance and functional advantages over existing multi-system solutions.
