Transformer Probe Sensor Assembly for Online Insulation Assessment
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Solution Overview
Problem
Existing methods for assessing the internal condition of transformers, particularly those under 10 MVA, are expensive, inaccurate, and require significant engineering expertise, leading to conservative management and premature retirement of these transformers due to the inability to effectively monitor moisture, partial discharge, and insulation aging.
Innovation Solution
A compact sensor assembly with external and internal sensors, including a probe and electronics, monitors transformer core temperature, insulation state, partial discharge, and mechanical state, using RF antennas, vibration, acoustic, and chemical sensors, transmitting data to a remote server for processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical sampling and laboratory testing of oil is used to assess transformer insulation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical laboratory testing systems with electronic sensor-based measurement systems. Instead of physically sampling oil and conducting complex chemical analyses in laboratories, the invention uses sensors to directly measure moisture content, partial discharge, and other insulation parameters, substituting mechanical/chemical testing with electronic detection.
Solution Approach 2:
The patent introduces sensors as intermediary devices between the transformer insulation and the assessment system. These sensors act as mediators that directly detect insulation conditions (moisture, partial discharge, temperature) without requiring oil sampling or complex laboratory equipment, simplifying the overall measurement system.
2Productivity
If online monitoring techniques are installed to continuously assess transformer condition, then productivity is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a universal monitoring platform that can assess multiple insulation parameters (moisture content, partial discharge, temperature, insulation resistance) simultaneously using integrated sensors. This multi-functional system provides continuous online monitoring without requiring separate specialized equipment for each parameter, reducing overall system complexity while maintaining high productivity.
Solution Approach 2:
The patent combines multiple assessment functions into a single integrated monitoring system. Instead of using separate systems for moisture measurement, partial discharge detection, and temperature monitoring, the invention merges these functions into one unified platform with coordinated sensors and processing, reducing device complexity while enabling continuous comprehensive monitoring.
3Reliability
If conservative management is applied to transformers under 10 MVA, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent implements continuous feedback monitoring of transformer insulation conditions through sensors that track moisture content, partial discharge, and temperature in real-time. This feedback mechanism provides actual condition data rather than relying on conservative estimates, enabling operators to make informed decisions about transformer service duration while maintaining reliability through early warning of degradation.
Solution Approach 2:
The patent performs preliminary assessment of transformer insulation condition using installed sensors before critical failures occur. By continuously monitoring insulation parameters and detecting degradation trends early, the system enables proactive maintenance planning and accurate determination of remaining service life, preventing both premature retirement and catastrophic failures.
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
Provides real-time, cost-effective monitoring of transformer conditions, enabling accurate assessment of load, insulation aging, partial discharge, and mechanical integrity, allowing for proactive maintenance and reducing unnecessary retirement.
Implementation Method 1
a probe antenna for detecting EM radiation due to partial discharge
Implementation Method 2
a heat block for preventing conduction of heat from the probe to the body
Data Source
AI summary
A sensor assembly for monitoring an internal condition of a transformer. The assembly includes: a body for location outside a tank of the transformer, the body housing an electronics assembly including body sensors coupled to a processor; a probe extending from the body for insertion into a tank of the transformer; a number of probe sensors coupled to the processor disposed at or toward a remote end of the probe for sensing conditions within the tank. The processor is configured to process signals from the probe sensors and the body sensors to produce signals for assessing one or more of: transformer core temperature; transformer insulation state; partial discharge; mechanical state of transformer; chemical state of transformer.