PMU-Based Voltage Reduction Calibration on Distribution Lines
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Solution Overview
Problem
Current methods for diagnosing electrical energy distribution lines are inadequate for performing accurate diagnostics on the line as a whole or 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 medium voltage distribution line with secondary substations, current transformers, measuring voltage transformers, and PMUs that detect and transmit current and voltage data to a receiving-processing unit for calibration of voltage reduction apparatuses, allowing for precise diagnostics and calibration without extensive setup or maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple devices and apparatuses are installed in the line for diagnostics, then measurement precision is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The patent combines multiple measurement functions (voltage measurement, current measurement, and diagnostics) into a single integrated system using PMUs at secondary substations. The PMUs perform both voltage and current measurements simultaneously, eliminating the need for separate dedicated measurement devices and reducing overall system complexity while maintaining diagnostic accuracy.
Solution Approach 2:
The PMUs are designed as multi-functional devices that can measure voltage, measure current, perform diagnostics on the distribution line, and calibrate voltage reduction apparatuses. This universal approach allows a single device type to replace multiple specialized apparatuses, reducing the total number of devices required in the system.
2Measurement precision
If measurement voltage transformers are installed in each secondary substation for diagnostics, then measurement precision is improved, but manufacturing precision and installation complexity increase
Solution Approach 1:
The existing voltage reduction apparatuses in secondary substations are utilized to perform their normal voltage reduction function while simultaneously serving as measurement points for the PMUs. The system leverages the existing infrastructure's operational characteristics to provide measurement data, eliminating the need for additional dedicated measurement transformation equipment in each substation.
Solution Approach 2:
The PMUs act as intermediary devices that can measure voltage directly from the existing busbars in secondary substations without requiring intermediate measurement voltage transformers. The PMUs interface with the existing system components and extract measurement data through standard electrical connections, avoiding the need for additional transformation equipment.
3Productivity
If diagnostics are performed with the line energized, then productivity is improved, but reliability may be compromised
Solution Approach 1:
The PMUs continuously monitor voltage and current with high sampling rates, providing real-time feedback on system conditions. This enables the identification of appropriate moments for calibration activities based on actual system state, allowing diagnostics to be performed during normal operation when system conditions are favorable, thus maintaining both productivity and reliability.
Solution Approach 2:
The system performs preliminary measurements and data collection during normal operation to prepare for calibration activities. By continuously monitoring and storing data, the system can identify optimal calibration moments in advance and execute calibration during energized operation without compromising safety, as the preliminary data preparation reduces the complexity and risk of the actual calibration procedure.
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 and efficient diagnostics and calibration of voltage reduction apparatuses, reducing costs and allowing modifications to existing systems without extensive equipment installations, thereby improving the accuracy and efficiency of electrical energy distribution line diagnostics.
Implementation Method 1
a first current transformer connected to the first line of medium voltage at a point between the first secondary substation and the second secondary substation and able to detect the current along the aforementioned first line of medium voltage
Implementation Method 2
a measuring voltage transformer connected to said first conductor and able to measure the voltage entering the first secondary substation
Data Source
AI summary
A method relating to a system for a line for the distribution of electrical energy comprises: a first distribution line (L1.MT); a first secondary substation (CS.100) comprising a first current transformer (116), a measurement voltage transformer (120) and a first PMU (151); and a second secondary substation (CS.200) comprising a second conductor (210), a first voltage reduction apparatus (230) and a second PMU (251), in which said method provides for carrying out operations in order to perform a calibration in relation to the first voltage reduction device (230) located in the second secondary substation (CS.200). A relative system.