PRS-7746A Phasor Measurement Unit
PRS-7746A synchronous PMU (the device) is mainly used for synchronous phasor measurement and output as well as dynamic recording for the power system.
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Busbar Protection
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Transformer Protection
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Transmission Line Protection
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Breaker Protection
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Feeder Protection
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Auxiliary Relay
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Merging Unit
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Digital Fault Recorder
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Power Stability Control System
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Power Generation Forecast
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Primary Frequency Controller
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Power Plant Controller
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Box Transformer Terminal Unit
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Centralized Control System
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Prefabricated Container
Product Presentation
The device is used for measurement of synchronous phasor and absolute phase angle of voltage and current at all nodes of the entire system by means of clock synchronization and digital signal processing technologies in accordance with IEEE Standard 1344 - 1995 (R2001) and the Technical Specifications for Real-time Dynamic Monitoring Systems of Power System. It provides necessary original data and realization means for such functions as wide-area monitoring of the entire system, substation automation measurement and control, stability control, and adaptive relay protection.
Product Feature
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Advanced Bus Technology
Employs state-of-the-art LVDS backplane bus technology to enable rapid I/O data exchange and enhance plug-in board resistance to interference and expandability.
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Comprehensive Functionalities
Provides transient waveform recording, continuous waveform recording, dynamic data recording, and subsynchronous oscillation monitoring functionalities, complying with prevalent international and national standards.
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Data Exchange
Ensures interoperability by following IEEE Std 1344/IEEE C37.118 and domestic standards, allowing effective transmission and sharing of information to a WAMS (Wide Area Monitoring System) master station.
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Efficient Data Transmission
Leverages 100M Ethernet and multithreading technology to support high-speed transmission of synchronous phasor data
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High-precision measurement
The measurement error of phase and internal potential angle is controlled within 0.2°
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Precise Clock Synchronization
Utilizes high-precision GPS clock and oven-controlled crystal oscillator to achieve time synchronization error < 1 µs; clock holdover error < 55 µs even after losing the GPS signal for 60 minutes.
Technical Specifications
Mounting Way
Flush mounted
Merchanical size
(width×high×deepth)
258.9mm×177.0mm×283.0mm
Communication Ports
4 Ethernet ports
Communication Protocol
IEC61850, IEEE 1344, IEEE C37.118
Time Synchronization
Pulse per second (PPS) and IRlG-B
Function
Synchronous Phasor Measurement
PMU Acquisition Unit Function
Self-diagnostic
Device power supply supervision
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