Sealed Bushing Diagnosis via Electrical Pressure Correlation
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Solution Overview
Problem
Existing methods for diagnosing electrical apparatuses with sealed fluid-based insulating systems require opening the apparatus, which can alter its properties, introduce contamination, and risk leakage, and are not suitable for single-unit diagnosis.
Innovation Solution
A method and device that determine a theoretical fluid pressure based on current measurements and compare it with actual fluid pressure measurements to diagnose the status of the apparatus without opening it, using a computer program product to perform these steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bushing is opened to take fluid samples for diagnosis, then the diagnosis can be performed, but the bushing properties are altered and contamination may occur
Solution Approach 1:
The patent replaces the mechanical sampling process (opening the bushing to extract fluid samples) with an electrical measurement system. The diagnosis is performed by measuring electrical parameters (current, voltage, impedance) of the bushing while it remains sealed, thereby substituting mechanical intrusion with non-invasive electrical characterization that does not cause contamination or property alteration.
Solution Approach 2:
The patent introduces an intermediary diagnostic system that measures electrical parameters of the bushing without direct contact with the internal fluid. This intermediary measurement approach allows diagnosis of bushing condition (fluid quality, insulation status) through electrical characteristics while the bushing remains sealed, avoiding direct contamination risks.
2Reliability
If traditional monitoring methods are used for transformers, then temperature and pressure can be monitored, but these methods cannot be applied to single bushing diagnosis
Solution Approach 1:
The patent creates a universal diagnostic method that can be applied to single bushings, transforming the specialized transformer monitoring approach into a broadly applicable solution. The electrical measurement technique works for individual bushings regardless of transformer context, enabling standalone diagnosis and extending monitoring capability from multi-unit transformer systems to single-apparatus bushing diagnosis.
Solution Approach 2:
The patent segments the diagnostic approach from the transformer system context, allowing the bushing to be diagnosed independently. By measuring electrical parameters directly at the bushing terminals without requiring transformer operation or multiple bushings for comparison, the method isolates and diagnoses the single bushing unit, making the diagnostic capability adaptable to individual apparatus.
Data Source
AI summary
A method and a device for diagnosing the status of an electrical apparatus having a sealed fluid based insulating system. The device includes at least one input for receiving measurements of a current running through the apparatus and measurements of an actual apparatus fluid pressure as well as a diagnosing unit. The diagnosing unit determines a corresponding theoretical apparatus fluid pressure based on the measured current, compares the actual apparatus fluid pressure with the theoretical apparatus fluid pressure and diagnoses the status of the apparatus based on the comparison.