Current Transformer Failure Diagnosis via Sensor Segmentation
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Solution Overview
Problem
Electromagnetic-inductive power supply apparatuses face reduced generating efficiency due to core property degradation and mechanical coupling failures in current transformers, which are exposed to environmental factors and mechanical stress.
Innovation Solution
An apparatus and method for diagnosing failures by comparing electrical properties (current, voltage, and power) detected in sensor and power-generation current transformers, using detection units, a converting unit for scaling values, and a failure determining unit to accurately assess transformer operation and power line status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the core of the current transformer is exposed to the outside to facilitate current detection and magnetic induction, then the detection capability is improved, but the core surface is oxidized by environmental factors such as rainwater and condensation, reducing its properties
Solution Approach 1:
The current transformer is divided into two separate units: a sensor current transformer for detection and a power-generation current transformer for power supply. This segmentation allows the sensor CT to be optimized for detection accuracy while the power-generation CT handles power conversion, preventing the core from direct environmental exposure while maintaining detection capability.
Solution Approach 2:
The sensor current transformer acts as an intermediary between the power line and the measurement system. It detects current without requiring the power-generation CT core to be exposed, thereby protecting the core from oxidation while still enabling accurate current detection through electromagnetic induction.
2Ease of operation
If the current transformer is installed at the power line with exposed core, then current detection is facilitated, but mechanical coupling failures and core failures occur due to mechanical stress
Solution Approach 1:
By segmenting the current transformer into sensor CT and power-generation CT, the mechanical stress and coupling requirements are distributed. The sensor CT can be installed with less mechanical stress for detection, while the power-generation CT handles the mechanical aspects of power extraction, reducing overall mechanical failure risk.
Solution Approach 2:
The sensor current transformer creates a copied version of the current measurement function, allowing the system to detect current without requiring the power-generation CT to be mechanically exposed or stressed. This copying approach separates the detection function from the power generation function, reducing mechanical stress on both components.
3Reliability
If the core properties are reduced due to oxidation and mechanical stress, then the electromagnetic-inductive power supply apparatus experiences reduction in generating efficiency
Solution Approach 1:
The segmentation into sensor CT and power-generation CT allows independent optimization. The power-generation CT can be designed with protected core structures to maintain properties over time, while the sensor CT handles detection. This ensures the power-generation CT maintains high generating efficiency without suffering from oxidation and mechanical stress.
Solution Approach 2:
The invention changes the operational parameters by using two separate current transformers with different functions. The power-generation CT operates under controlled conditions to maintain core properties, while the sensor CT operates independently for detection. This parameter separation maintains generating efficiency by preventing core property degradation in the power-generation unit.
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
Accurately detects transformer failures and power outages, preventing efficiency reduction and ensuring normal operation by comparing scaled values from sensor and power-generation current transformers, thus maintaining efficient power supply.
Implementation Method 1
the electromagnetic-inductive type power supply apparatus converts the power acquired by the electromagnetic-inductive phenomenon in the current transformer into DC
Implementation Method 2
a sensor current transformer for detecting a current (or a voltage) flowing in the power line
Data Source
AI summary
Disclosed are an apparatus and a method for diagnosing a failure of an electromagnetic-inductive power supply apparatus, which diagnoses whether a power-generation CT has failed by comparing the values detected in a sensor CT and the power-generation CT, thereby preventing the generating efficiency from being reduced. The disclosed apparatus for diagnosing the failure of the electromagnetic-inductive power supply apparatus detects detection values of a power-generation CT and a sensor CT, converts detection values into converted value by scaling detection values, and diagnoses whether the current transformer has failed and whether the power-outage has occurred based on converted values.