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Power meter

Electric power meters are utilized in household and industrial applications to measure and indicate the amount of electric power consumed by the load to which the power meter is connected. Power meters are used by utility companies for measuring and providing a readout for the quantity of electricity that has been used in a commercial or residential establishment. Electrical utility companies track electric usage by customers by using power meters. These meters track the amount of power consumed at a particular location, such as a substation. The electric utility companies may use the power meter to charge its customers for their power consumption, i.e., revenue metering. Electricity from a utility is fed from a primary substation over a distribution cable to several local substations. At the substations, the supply is transformed by distribution transformers from a relatively high voltage on the distributor cable to the lower voltage at which it is supplied to the end consumer. Typically, electrical power supplied for residential applications is single phase alternating current power. To measure the consumption of electricity in residential applications, a utility company meter is provided at the electrical service entrance to the residence. Utility company meters include electromechanical based meters, purely electronic component based meters, and hybrid electromechanical/electronic meters. The electric utility meters most commonly in use are of the electromechanical type. The meters are generally highly reliable, but do not lend themselves to remote or automated reading. Automatic power meter readers are typically retrofitted to existing power meters and are typically connected to the power lines power to obtain power.

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