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Sistema automatiko na pang-proteksyon ng linya ng distribusyon ng PMU ay isang bagong sistema ng automatikong distribusyon ng linya.
para sa kasalukuyang problema lalo na ang pagkakasira ng lupa.
na batay sa Phasor Measurement-μPMU ng Synchronous na Network ng Distribusyon.
PMU (phasor measurement unit), Isang malayang device o module. Ang datos ng sampling ng voltage/current ay lahat may timestamp na accurate sa US level ng BDS/GPS.
Pangunahing mga function: • Phasor: amplitude, phase Angle, • Frequency (f) at Variation ng Frequency (△f/△t)
Diagrama ng Block ng Hardware Architecture ng μPMU
Wide Area Measurement System (WAMS)
• Ang mga sukat ng PMU ay lubos na synchronized sa World
Standard Time (UTC)
• Pag-sync ng wide-area ng maraming PMU
na nai-install sa iba't ibang lugar
• Mathematical expression ng signal ng voltage/current:
Overhead Current Sensor i-WCS – Single Channel Current PMU
Solusyon para sa problema ng network ng distribusyon na batay sa PMU ng network ng distribusyon at teknolohiya ng wide area synchronous phasor measurement.
• Mataas na precision at mataas na frequency current acquisition
• Wide-area synchronized, power induction
• Live installation, IP67 protection
• Suporta bi-directional power flow o ring network operation
• 3G/4G/ 5G communication：
a. Periodically report each harmonic
b. Local events trigger the upload data
c. Remote call and test specific moment data
• 1μs Wide-area synchronized
• 12.8kHz Sample frequency
• 60 min Wave record and playback
• 0.5 Measuring accuracy
• 3.5A Full function minimum operating current
Cable Type Current Sensor RCMU – Multichannel Current PMU
RCMU - Underground cable current sensor
• 1μs Wide-area synchronized
• 12.8kHz Sample frequency
• 0.5 Measuring accuracy
• 60 min Data Playback
• 3 current measuring
• Wireless/wired remote transmission
• Collect three-phase current, same as overhead type principle, suitable for ring main unit, switching station, substation.
• Wide area synchronous, induction power, or 24V/48V DC power supply
• Local fault decision algorithm based on current:
a. Short-circuit overcurrent
b. Zero sequence overcurrent
c. Asymmetric phase current
• Wave record called measurement, Support distributed fault location
• Support bi-directional power flow or ring network operation
• 3G/4G/5G or network communication
Bus Collecting Unit BDCU – Single/Multiple Voltage PMU
Indoor type and Outdoor type
• 220V AC/24V DC power supply • Fiber optic, wired, wireless
• IEC 60870-5- 101/104/DNP3 • 300 current sensors can be accessed Voltage Acquisition：
• 1μs Wide-area synchronized
• 1.0 Measuring accuracy
• 12.8kHz Sampling frequency
• 60 min Wave record playback
For single-phase grounding fault with ground current greater than 1A, the detection and positioning accuracy is 100%, with 0 false positives
• Collect zero sequence voltage, start recording of earth fault
• Collect and process the recording wave, and determine the fault comprehensively
• Safe access to the main power distribution station
a. Used as the station grounding insulation monitoring device
b. Used as an in-station grounding insulation monitoring device
c. Do not rely on the master station to complete the fault
The Composition of Intelligent Distribution Network Condition Monitoring System Based on PMU Measurement
Distribution Network Usage Scenarios
Typical Use of PMU - Line Condition Assessment
Typical Use of PMU - Distributed Wave Recording
The recording data of all monitoring points in the line and station are labeled with absolute time at the level of microsecond. Any device can trigger recording when the preset start conditions are met. Provide a "snapshot" of the entire network based on the time callback of any event at any locationup to the recorded data of all sensors. It provides global data for detailed analysis of events and facilitates process inversion, traceability, and early warning of abnormal state, etc.
Typical Use of PMU - Power Quality Monitoring
07/26/2023
