Power Theft Detection via Impedance Anomaly Analysis
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Solution Overview
Problem
Current electric operations lack the capability to systematically detect power theft without physical inspection of an electric line, due to infrequent meter readings that fail to capture small variations in power utilization.
Innovation Solution
A fiber optic network connects active devices in the electric grid, enabling the capture of impedance measurements at transformers and meters. These measurements are used to produce evolving estimates of power loss, allowing a control system to detect anomalous changes indicative of power theft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If infrequent meter readings are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces traditional mechanical/electrical meter reading systems with electromagnetic field-based detection. Current transformers and voltage transformers create electromagnetic fields that are sensed by detection devices, enabling continuous monitoring without physical contact with the metering infrastructure. This substitution enables high-precision detection while maintaining simplicity in the reading mechanism.
Solution Approach 2:
The patent introduces intermediary detection devices that indirectly measure power theft by detecting changes in electromagnetic fields and impedance in the distribution line. These intermediaries (current transformers, voltage transformers, detection devices) measure the effect of power theft on the electrical parameters without directly intercepting the stolen power flow, enabling detection while maintaining system simplicity.
2Measurement precision
If continuous monitoring is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the monitoring function into distributed detection devices placed at different locations along the distribution line. Each detection device independently monitors its local section by measuring electromagnetic fields and impedance changes. This segmentation enables continuous monitoring coverage without requiring a single complex centralized system, as each segment operates independently and contributes to the overall detection capability.
Solution Approach 2:
The detection devices utilize the existing electromagnetic fields and electrical parameters in the distribution line to perform self-diagnosis and detection. The system measures impedance changes and power loss using the line's own operational parameters without requiring external power sources or additional complex infrastructure. The distribution line itself provides the measurement medium, reducing the need for separate monitoring infrastructure.
3Measurement precision
If physical inspection of electric lines is performed, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent implements continuous monitoring by keeping detection devices permanently installed and operational along the distribution line. The devices continuously measure electromagnetic fields and impedance parameters in real-time as power flows through the line. This continuous action eliminates the need for periodic physical inspections, providing ongoing detection capability that immediately identifies power theft events without interruption or time loss.
Solution Approach 2:
The patent replaces mechanical physical inspection methods with electromagnetic field-based detection. Instead of physically accessing and inspecting the distribution line and metering equipment, the system uses current transformers and voltage transformers to create electromagnetic fields that are sensed by detection devices. This substitution enables remote, continuous monitoring that eliminates the time-consuming nature of physical inspections while maintaining or improving detection accuracy.
Data Source
AI summary
Systems, apparatuses, methods, and computer program products are disclosed for power theft detection. An example method includes receiving, by a control system, telemetry data from a transformer adjacent to a customer premise and a meter at the customer premise and storing, by the control system, the telemetry data in a memory. The example method further includes calculating, by the control system and using the telemetry data, a change in impedance in an electric line segment between the transformer and the meter, and determining, by the control system, whether the change in the impedance in the electric line segment is anomalous. Corresponding apparatuses and computer program products are also disclosed.