Harmonic Detection System for Power Distribution Networks
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Solution Overview
Problem
Conventional harmonic monitoring in power distribution networks requires frequent manual patrols, making it time-consuming and costly, and unable to detect sudden abnormalities between patrols.
Innovation Solution
A harmonic detection system comprising a measurement component, harmonic detector, and notification device installed on power lines, allowing for continuous monitoring and immediate notification of abnormalities, reducing the need for frequent patrols and enabling users to address issues promptly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual patrols are used to monitor harmonics, then measurement accuracy is maintained, but monitoring time and cost increase significantly
Solution Approach 1:
The system employs automatic measurement components that continuously monitor harmonics without human intervention. The measurement component autonomously captures current waveforms, the harmonic detector automatically analyzes the data to identify harmonic abnormalities, and the notification device independently alerts users. This self-service automation eliminates the need for manual patrols while maintaining measurement accuracy, directly resolving the contradiction between detection precision and monitoring time.
Solution Approach 2:
The patent replaces the mechanical manual patrol system with an automated electronic monitoring system. Instead of workers physically visiting measurement sites with handheld devices, the system uses fixed measurement components equipped with current transformers that automatically measure and transmit data. The harmonic detector processes this data electronically to identify abnormalities, substituting mechanical human operations with automated electronic systems to reduce monitoring time while preserving accuracy.
2Loss of energy
If manual patrols are conducted periodically, then cost is reduced compared to continuous monitoring, but sudden abnormalities cannot be detected quickly
Solution Approach 1:
The system implements continuous harmonic monitoring through permanently installed measurement components that operate without interruption. The measurement component continuously captures current waveforms, and the harmonic detector continuously analyzes the data stream to identify abnormalities in real-time. This continuous operation enables immediate detection of sudden abnormalities while maintaining cost-effectiveness through automation, resolving the contradiction between monitoring cost and detection speed.
Solution Approach 2:
The measurement components are pre-installed at strategic locations in the power distribution network before abnormalities occur. These components are positioned to monitor critical points where harmonics may develop, enabling the system to detect abnormalities as soon as they arise without waiting for scheduled patrols. This preliminary positioning of monitoring equipment ensures rapid detection capability while avoiding the costs of frequent manual inspections.
3Area of stationary object
If multiple workers are deployed for patrols, then measurement coverage is improved, but operational complexity and cost increase
Solution Approach 1:
The monitoring system is segmented into multiple independent measurement components, each responsible for monitoring a specific location or circuit. Each measurement component includes its own current transformer, data capture capability, and communication interface. This segmentation allows the system to cover multiple areas simultaneously through distributed sensors rather than requiring multiple workers to travel to each location, reducing operational complexity while expanding measurement coverage.
Solution Approach 2:
The measurement components are designed as universal, multi-functional units that can be deployed at various locations in the power distribution network. Each unit performs multiple functions: measuring current waveforms, detecting harmonics, transmitting data, and alerting users. This universality allows a single type of measurement component to provide comprehensive coverage across multiple areas, eliminating the need for specialized equipment or multiple workers with different skill sets, thereby reducing system complexity while maintaining extensive coverage.
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 quick and cost-effective detection of harmonic abnormalities, allowing users to address issues promptly and reducing the burden of frequent manual monitoring.
Implementation Method 1
the worker uses a measurement device that is attached to the power line and measures the waveform of the current flowing through the power line by means of a current transformer (CT)
Data Source
AI summary
A harmonic detection system (1) comprises a measurement component (71), a harmonic abnormality determination unit (561), and a smartphone (9). The measurement component (71) is installed at a specific position on a distribution line constituting a distribution network (100), and measures data related to the current of the distribution line. The harmonic abnormality determination unit (561) uses some or all of the data related to current as detection data to detect abnormality related to harmonics. The smartphone (9) is owned by a user (G), and notifies the user that an abnormality has occurred in the distribution line when a harmonic is detected.