Distribution Line PMU Calibration for Voltage Reduction Apparatus
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Solution Overview
Problem
Current methods for diagnosing and calibrating electrical energy distribution lines are inadequate, as they fail to provide accurate diagnostics for the entire line and its components, require multiple devices and apparatuses, and cannot modify existing systems without costly installations, such as adding measurement voltage transformers to each secondary substation.
Innovation Solution
A system comprising a primary substation, medium voltage distribution lines, and secondary substations, equipped with HV/MV voltage transformers, current transformers, PMUs, and a receiving-processing unit that detects and transmits voltage and current data to calibrate voltage reduction apparatuses without the need for extensive device installation, allowing for accurate diagnostics and calibration of voltage reduction apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple devices and apparatuses are installed in the line for diagnostics and calibration, then measurement precision is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The PMU devices are designed to perform multiple functions: they measure voltage and current, synchronize data using GPS signals, detect line conditions, and enable calibration of voltage reduction apparatus. This multi-functionality eliminates the need for separate dedicated diagnostic devices at each substation, reducing overall device complexity while maintaining measurement precision
Solution Approach 2:
The patent combines voltage measurement, current measurement, time synchronization, and data processing functions into integrated PMU systems at each substation. By merging these functions into unified devices rather than using separate apparatuses, the system reduces the total number of components while achieving comprehensive diagnostics
2Measurement precision
If measurement voltage transformers are installed in each secondary substation for calibration, then measurement precision is improved, but ease of manufacture and installation are worsened
Solution Approach 1:
The patent introduces GPS-based time synchronization as an intermediary mechanism that enables accurate calibration without requiring physical installation of measurement voltage transformers in each secondary substation. The synchronized time references allow remote calibration and diagnostics, simplifying installation while maintaining precision
Solution Approach 2:
Instead of installing identical measurement equipment in each substation, the system uses PMUs that replicate measurement functions and synchronize their data through time-stamped measurements. This allows one reference measurement system to effectively serve multiple substations through data correlation, reducing installation complexity
3Measurement precision
If existing line systems are modified to enable diagnostics, then measurement precision is improved, but loss of time and productivity are worsened during modification
Solution Approach 1:
The PMU devices are pre-configured with GPS time synchronization capabilities and measurement functions before installation. This preliminary preparation allows for rapid deployment in existing line systems without requiring time-consuming on-site calibration and configuration, reducing modification time while maintaining measurement precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate diagnostics and calibration of voltage reduction apparatuses in electrical energy distribution systems, reducing costs and allowing for modifications to existing systems without extensive setup or maintenance, improving the efficiency and accuracy of line diagnostics.
Implementation Method 1
a voltage transformer suitable for transforming the high voltage electrical energy coming from said first conductor into medium voltage electrical energy
Implementation Method 2
a current transformer connected to the first line of medium voltage in an initial zone of the same first line and able to detect the current at the beginning of said first line of medium voltage
Data Source
AI summary
A method relating to a system for a line for the distribution of electrical energy comprises: a primary substation (CP) comprising a conductor (11), an HV/MV voltage transformer (12), a second conductor 13, a busbar (14), an initial portion of a first distribution line (L 1.MT), a measurement voltage transformer (15), a first current transformer (16) and a first PMU (51); a first medium voltage distribution line (Ll.MT); a first secondary substation (CS.100) comprising a third conductor (110), a second current transformer (116), a first voltage reduction apparatus (120) and a second PMU (151); and a second secondary substation (CS.200) comprising a fourth conductor (210), a second voltage reduction apparatus (230) and a third PMU (251); wherein said system comprises a receiving processing unit (UR); and wherein said method provides for carrying out operations in order to perform a calibration in relation to the first (120) and second (230) voltage reduction apparatus. A related system.