Phasor measurement unit

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A time-synchronized meter pointer (English time- synchronized phasor measuring device, phasor measurement unit, PMU ) is a device that measures the complex amplitude of current and voltage at a certain time ( phasor ). From values ​​such as voltage, phase angle, frequency, frequency variation, degree of damping, etc., are calculated and associated with the time of measurement. It can be made, for example, 60 measurements per second. To make a synchronization of multiple instruments possible, each device uses a GPS time signal so that the values ​​determined to be associated with a measurement time and to transfer via remote data transmission to a central station. There, the data stream with other streams can be combined from other instruments, so as to compute more information.

These instruments can be used in medium voltage networks, for example, to determine a surplus or a need for more electrical power (reactive power or real power) to control according to the power plants. It can also be a Wide Area Monitoring System ( German: Wide area monitoring systems) will be created, for example for the analysis of power flows, for post event analysis or monitoring of network dynamics ( bsw throughout the European network ). Thus, acute power swings, for example after power plant outages or witnessed a short circuit (see also: quality of care ). Another application is where an electrical event in the power supply passes through the dynamic determination of the place, when at least two time-synchronized meter pointer have mapped the event.