Sistema nga automatikong pangprotektsyon sa distribusyon nga may mataas nga presisyon nga PMU
Ang sistema ng automation ng proteksyon ng linya ng distribusyon ng PMU ay isang bagong sistema ng automation ng distribusyon ng linya.
para sa kasalukuyang problema lalo na ang earth fault.
na batay sa Phasor Measurement-μPMU ng synchronous na network ng distribusyon.
PMU (phasor measurement unit), isang stand-alone na device o module. Ang data ng sampling ng voltage/current ay may timestamp mula sa BDS/GPS na naka-accurate sa US level.
Pangunahing mga function: • Phasor: amplitude, phase Angle, • Frequency (f) at Variation ng Frequency (△f/△t)
Diagrama ng Block ng Arkitektura ng Hardware ng μPMU
Wide Area Measurement System (WAMS)
• Ang mga sukat ng PMU ay absolutong synchronized sa World Standard Time (UTC)
• Synchronized na wide-area measurement ng maraming PMU na nakainstalla sa iba't ibang lugar
• Mathematical na 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 sa teknolohiya ng wide area synchronous phasor measurement.
• Mataas na presisyon at mataas na frequency na acquisition ng current
• Synchronized na wide-area, power induction
• Live installation, IP67 protection
• Suporta ng 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 at 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
Para sa single-phase grounding fault na may ground current na mas malaki kaysa 1A, ang detection at positioning accuracy ay 100%, na walang 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
Ang recording data ng lahat ng monitoring points sa linya at estasyon ay may label na absolute time sa antas ng microsecond. Anumang device ay maaaring mag-trigger ng recording kapag nasatisfy ang preset na start conditions. Provide a "snapshot" ng buong network batay sa time callback ng anumang event sa anumang lugar up to the recorded data ng lahat ng sensors. It provides global data para sa detailed analysis ng events at facilitates process inversion, traceability, at early warning ng abnormal state, etc.
Typical Use of PMU - Power Quality Monitoring
