Air Circuit Breaker Current Transformer With Magnetic Flux Compensation
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Solution Overview
Problem
Current transformers in air circuit breakers face issues with heat generation and fire risk due to increased secondary current magnitude in normal current regions, and existing solutions do not effectively stabilize secondary currents or reduce magnetic core volume.
Innovation Solution
Incorporating a magnetic flux compensation member coupled to the magnetic core, which adjusts magnetic flux levels to maintain stable secondary currents and reduce heat generation, while maintaining a compact design to minimize space and vibration risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current transformer operates in a normal current region with rated current flowing for a long time, then the secondary current magnitude increases, but the magnetic core generates excessive heat causing fire risk
Solution Approach 1:
A magnetic flux compensation member is introduced as an intermediary element between the magnetic core and the secondary coil. This member compensates for magnetic flux in the core, thereby stabilizing the secondary current magnitude and preventing excessive heat generation during prolonged normal operation
Solution Approach 2:
The invention changes the magnetic flux parameter in the magnetic core by introducing the magnetic flux compensation member. This parameter change stabilizes the secondary current output and prevents the heat generation problem that occurs during extended normal current flow
2Volume of moving object
If the magnetic core volume is reduced to minimize space and vibration risks, then the device becomes more compact, but the magnetic flux compensation becomes more difficult
Solution Approach 1:
The magnetic flux compensation member is positioned in a specific spatial dimension adjacent to the magnetic core, allowing flux compensation to occur in a compact configuration. This dimensional arrangement enables effective flux compensation without requiring increased core volume
Solution Approach 2:
The magnetic flux compensation member serves as a mediator that enables stable secondary current output from a compact magnetic core, resolving the contradiction between small volume and reliable current stabilization
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
The solution ensures stable secondary current supply to relays, reduces heat generation and fire risk, and optimizes space utilization by maintaining a small magnetic core volume, thereby enhancing operational safety and efficiency.
Implementation Method 1
A primary current is induced in the magnetic core. A secondary coil is placed adjacent to the magnetic core, and a secondary current of a magnitude proportional to that of the current flowing through the main circuit is induced in the secondary coil
Implementation Method 2
The magnetic flux compensation member is coupled to the magnetic core to compensate for the current induced in the secondary coil
Data Source
AI summary
A current transformer according to the present invention may comprise a magnetic core, a secondary coil, and a magnetic flux compensation member. A main circuit of an air circuit breaker penetrates the magnetic core. In addition, the secondary coil is arranged to be adjacent to the magnetic core, and a secondary current is induced through a current flowing in the main circuit. In addition, the secondary coil supplies the induced secondary current to a relay. The magnetic flux compensation member may be coupled to the magnetic core so as to correct magnetic flux of the secondary coil.