5.3 Measurement
The general measurement quantities include both directly sampling and calculated quantities.
These quantities are generally used for protection analyzing and metering calculation. All these
quantities can be displayed in the local HMI or transmitted to the PRS IED Studio, SCADA or
dispatching center through network communication.
Through the PRS IED Studio configuration tool, the measurement channels in the transformer
module can be flexibly connected to any measurement quantity according to the designing
requirements.
5.3.1 Protection Sampling
The protection sampling rate is 40 points per cycle. Different protection logics use different
measurement quantities, including the RMS value, the phase angle, the frequency, the harmonic
content, the sequence components and so on. All these protections sampled values are displayed
in HMI with 0.5s updating rate.
5.3.2 Metering
The metering rate is 40 points per cycle. Different functions, such as controlling, monitoring and
metering, use different measurement quantities, including the RMS value, the phase angle, the
frequency, the harmonic content, the sequence components and so on. All these metering values
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