Load Break Rotary Switch Position Indication Without Oil-Leak Windows
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Solution Overview
Problem
Existing transformers with load break rotary switches pose safety risks during maintenance due to potential misalignment of contact blades, which can lead to unsafe conditions for operators, and existing safety features like windows for visual inspection increase the risk of oil leakage.
Innovation Solution
A transformer with a magnetically sensitive indicator component that changes states based on the position of the load break rotary switch's shaft, allowing operators to remotely check the contact status safely without the need for windows, thereby reducing the risk of oil leakage and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If an elongate window is provided in the transformer housing wall for visual inspection of contacts, then the operator can check the status of contacts visually, but the risk of oil leakage increases
Solution Approach 1:
The patent replaces the mechanical/optical inspection method (visual check through window) with a magnetic field-based detection system. A magnetically sensitive indicator component responds to the position of the shaft contact by changing its magnetic state, which can be detected remotely without penetrating the housing wall, thus eliminating the need for a window and preventing oil leakage.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the shaft contact position and the external detection system. The magnetically sensitive indicator component translates the mechanical position into a magnetic state change, allowing indirect detection of contact status without physical penetration of the housing, thereby maintaining sealing integrity.
2Ease of operation
If the contact blade is manually positioned to connect or disconnect the transformer, then the transformer can be energized or de-energized, but safety risks arise when the contact blade is in contact despite the handle indicating OFF position
Solution Approach 1:
The patent implements a feedback mechanism where the magnetically sensitive indicator component continuously reflects the actual position of the shaft contact. This provides real-time feedback to the operator about the true contact status, independent of the handle position, enabling verification of whether the contacts are truly disconnected before maintenance operations.
Solution Approach 2:
The system uses the existing magnetic field generated by the shaft contact itself to indicate its position. The shaft contact's magnetic properties are utilized directly to actuate the magnetically sensitive indicator, eliminating the need for additional sensors or power sources, and providing self-verification of contact status.
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 magnetically sensitive indicator provides a reliable and quick means to determine the actual status of the contacts, reducing the risk of operator injury and minimizing oil loss, while maintaining a cost-effective construction.
Implementation Method 1
A transformer with a magnetically sensitive indicator component that changes states based on the position of the load break rotary switch's shaft
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
A transformer comprises a transformer housing, a stationary contact (4), a load break rotary switch (6) and a magnetically sensitive indicator component (20). The transformer housing comprises a transformer housing wall (2) separating an inner housing area (I) from an outer housing area (II). The stationary contact (4) is disposed stationary relative to the housing. The load break rotary switch (6) comprises a shaft (8), comprising a shaft portion (10) which is disposed in the inner housing area (I) and a shaft contact (12) attached to the shaft portion (10). The shaft (8) is supported with respect to the transformer housing wall (2) rotatably about a rotary axis (R) between a first position in which the shaft contact (12) is electrically connected to the stationary contact (4) and a second position in which the shaft contact (12) is electrically not connected to the stationary contact (4). The load break rotary switch (6) further comprises a lever (14) connected to the shaft portion (10) with respect to the rotary axis (R) in a rotationally fixed manner, wherein the lever (14) comprises a lever portion (16) having a radial distance (d) from the rotary axis (R). The lever portion (16) comprises a lever magnet (18). The magnetically sensitive indicator component (20) is attached to the transformer housing wall (2), wherein the magnetically sensitive indicator component (20) is placeable selectively into a first state in which the magnetically sensitive indicator component (20) is indicative of the first state and into a second state in which the magnetically sensitive indicator component (20) is indicative of the second state. The magnetically sensitive indicator component (20) is switched from its first state into its second state by the lever magnet (18) when the shaft (8) is rotated from the first position to the second position or vice versa. Thus, an operator of the transformer can make sure that the shaft contact is disconnected from the stationary contact before preforming a maintenance work.