Demagnetizing Transformer Cores via Primary Side Alternating Signals
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Solution Overview
Problem
Transformer cores in electrical engineering installations can become strongly magnetized during testing, leading to unreliable detection of fault currents, as existing methods fail to effectively demagnetize them without accessing the secondary side, resulting in potential damage from delayed or missed fault current detection.
Innovation Solution
A demagnetization device and method that applies an alternating signal with varying frequency and/or amplitude to the primary side of the transformer, allowing for simultaneous demagnetization of multiple transformers sharing a common primary conductor without the need for secondary side access, using a device with a source to generate the signal and detect responses for adaptive variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct current is applied during testing of electrical engineering facilities, then the transformer core becomes strongly magnetized, but this leads to unreliable fault current detection and potential damage
Solution Approach 1:
The demagnetization device applies a preliminary alternating current treatment to the transformer core before normal operation to eliminate residual magnetization. This preliminary action prevents the core from being in a magnetized state that would cause saturation and unreliable fault detection during subsequent testing or operation.
Solution Approach 2:
The invention converts the harmful effect of strong magnetization into a beneficial demagnetization process. By applying an alternating current that gradually decreases in amplitude, the device uses the magnetic field to progressively reduce and eliminate residual magnetization, transforming the problematic magnetic state into a useful demagnetization treatment.
2Object-generated harmful factors
If existing demagnetization methods are used, then the transformer core can be demagnetized, but access to the secondary side is required which increases device complexity and operational difficulty
Solution Approach 1:
The invention extracts the demagnetization function from the secondary side and relocates it to the primary side. By applying the alternating current through the primary winding, the device eliminates the need for secondary side access, simplifying the overall system configuration and making the demagnetization process more accessible and easier to perform.
3Productivity
If multiple transformers share a common primary conductor, then space and resources are optimized, but demagnetization becomes more complex requiring access to all secondary terminals
Solution Approach 1:
The demagnetization device provides a universal solution that works for multiple transformers sharing a common primary conductor. By applying the alternating current through the common primary winding, a single demagnetization operation simultaneously treats all connected transformers, eliminating the need to access and operate on each transformer's secondary terminals individually.
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
This approach effectively reduces the risk of transformer cores becoming strongly magnetized, ensuring reliable fault current detection by demagnetizing transformer cores efficiently and reliably without requiring access to the secondary side, thereby reducing operational risks and costs.
Implementation Method 1
an alternating signal is fed to a primary side of the transformer
Implementation Method 2
The 'demagnetization' of the transformer core is to be understood here as a process whereby the magnetization of the transformer core in a de-energized state, also described as remanence, is reduced
Data Source
AI summary
In order to demagnetize a transformer core (13, 23) a demagnetization device (40) is detachably connected to a primary side (11) of a transformer (10, 20). An alternating signal is fed to the primary side (11) in order to demagnetize the transformer (10, 20).