SATEC model PM180 Power Quality Meter can provide Phasor Measurement Unit (PMU) per IEEE C37.118.1 (Wide Area Monitoring System)
PM180 PMU Features
The SATEC PM180 is a Power Quality metering controller used to estimate the magnitude and phase angle of an electrical quantity: magnitude measurement of three-phase voltage and current synchrophasors.
The estimates are calculated from the input signal waveforms synchronized to an absolute time reference.
This is followed by complex multiplication with the nominal frequency carrier, e.g. multiplication of the input by the quadrature oscillator (sine and cosine).
- IEEE C37.118.1-2011, IEEE C37.118.1a-2014 and IEC/IEEE 60255-118-1:2018 P and M class performance compliance
- IEEE C37.118.1 three-phase voltage and current phasor measurements synchronized to a common UTC time reference, e.g. GPS
- IEEE C37.118.1 synchronous frequency and rate of change of frequency (ROCOF) measurements
- Clock synchronization to a common UTC time reference using an IRIG-B timecode source or an IEEE 1588 PTPv2 master clock source
- IEEE C37.118.2 commanded client-server UDP and TCP data transmission and spontaneous UDP data transmission over IP protocol
- Optional IEEE C37.118.2 frame extensions with analog data (total active, reactive and apparent power and power factor) and digital status data (up to 32 inputs)
- Streaming of phasor data over Ethernet using the IEC 61850-9-2 multicast sampled value (SV) service with IEEE C37.118.2 compliant mapping of synchrophasor data upon IEC 61850-9-2 and IEC 61850-90-5 guidelines
PMU Clock Synchronisation
The PMU comes with a Telnet server that can be used to check the PMU clock status and time accuracy.
The PMU must be connected to a reliable and accurate GPS time source, that can provide time traceable to UTC so all measurements are synchronised to UTC time with accuracy sufficient to meet the requirements of IEEE C37.118.1.
The PMU clock can be synchronized to UTC using an IRIG-B timecode source or an IEEE 1588 PTPv2 master clock source.
IEC 61850 Communication Frame
IEEE C37.118.2 synchrophasor data stream is mapped to IEC 61850-9-2 sampled values APDU (application protocol data unit).
The sampled values dataset is user configurable. Encoding of the sampled values APDU frame is shown.
Unlike other APDU attributes, a sequence of sampled phasor data is encoded as a compact block without ASN.1 tag triplets.
The dataset members are encoded in their basic forms using fixed-length basic data type encoding rules listed in IEC 61850-9-2 Table 15.
The following picture shows an example of the multicast sampled values frame that carries a synchrophasor data stream over an Ethernet LAN.
The PM180 Analyser
The PM180 is a Class A, Edition 3, multifunction power quality analyser. Functionality includes: Digital Fault Recorder, PMU (per IEEE C37.1118), PLC controller and more. For more information, visit our PM180 product page.