PMU ਉੱਤਮ ਸਹਿਣਾਂ ਵਾਲਾ ਡਿਸਟ੍ਰੀਬਿਊਸ਼ਨ ਲਾਇਨ ਪ੍ਰੋਟੈਕਸ਼ਨ ਐਵਟੋਮੇਸ਼ਨ ਸਿਸਟਮ

PMU distribution line protection automation system is a new line distribution automation system.

for solving present problem especially of earth fault.

which is based on a Distribution Network Synchronous Phasor Measurement-μPMU.

PMU (phasor measurement unit), A stand-alone device or module. The voltage/current sampling data are all with a BDS/GPS timestamp accurate to US level.

Basic functions: • Phasor: amplitude, phase Angle, • Frequency (f) and Frequency Variation (△f/△t)

μPMU Hardware Architecture Block Diagram

Wide Area Measurement System (WAMS)
• PMU measurements are absolutely synchronized with World
Standard Time (UTC)
• Wide-area measurement synchronization of multiple PMUs
installed in different locations
• Mathematical expression of voltage/current signal:

Overhead Current Sensor i-WCS – Single Channel Current PMU

Solution for distribution network problem which is based on the distribution network PMU and the wide area synchronous phasor measurement technology.

• High precision and high frequency current acquisition
• Wide-area synchronized, power induction
• Live installation, IP67 protection
• Support bi-directional power flow or 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 location up 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