Phasor Measurement Unit (PMU) and Grid Monitoring

Phasor measurement units for synchrophasor measured values and IEEE C37.118 protocol and grid monitoring systems

Phasor Measurement Units (PMUs) and its measured synchrophasors make a valuable contribution to the dynamic monitoring of transient processes in energy supply systems.

Phasor Measurement Units (PMUs) measure current and voltage by amount and phase at selected stations of the transmission system. The high-precision time synchronization (via GPS) allows comparing measured values (synchrophasors) from different substations far apart and drawing conclusions as to the system state and dynamic events such as power swing conditions. All SIPROTEC 5 devices can be used as a Phasor Measurement Unit. When selecting the option “Phasor Measurement Unit”, the devices determine current and voltage phasors, provide them with highly accurate time stamps and transmit them for analysis together with other measured values (frequency, speed of frequency change) using the IEEE C37.118 communication protocol, which are typically sent to the control center.

SIGUARD PDP (Phasor Data Processor) is a system for Wide Area Monitoring and Grid Monitoring, that, as its measured variables, uses synchrophasors from phasor measurement units serving as sensors. It helps with quick recognition of the current network situation and indicates both power swings and transient phenomena, transparently as well as instantly. Replication of the respective network topology is not required. The tool supports control center personnel in assessing critical grid situations and contributes to the taking of suitable action. As all measured results are stored, power system disturbances can be promptly analyzed.

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PMU functionality is supported by the SIPROTEC 5 system. Find the right devices for your application.


SIGUARD PDP (Phasor Data Processor) is a system for Grid Monitoring, that uses synchrophasors from phasor measurement Units.