Dynamic Winding Pressing for High-Voltage Electrical Devices
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Solution Overview
Problem
Existing electrical devices with magnetizable cores and windings face challenges in adjusting winding pressure externally, as static pressing elements have limited spring travel and require costly and complicated disassembly for pressure checks or adjustments.
Innovation Solution
A drivable pressing element connected to an actuating unit allows for external adjustment of winding pressure, using electrically drivable or hydraulic pressing elements with compensation means to maintain consistent pressure, and includes mechanical or pneumatic spring elements for temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static pressing elements with limited spring travel are used, then the device structure is simple, but the winding pressure cannot be adjusted after assembly and requires complicated disassembly for pressure checks
Solution Approach 1:
The pressing element is designed with a movable piston that can be driven by hydraulic or electric actuating units, transforming the static pressing mechanism into a dynamic one. This allows the winding pressure to be adjusted continuously after assembly by controlling the piston's position, eliminating the need for disassembly while maintaining manageable device complexity through modular actuating components.
Solution Approach 2:
A hydraulic fluid or electric actuator serves as an intermediary between the control system and the pressing element. The hydraulic fluid transmits force from the actuating unit to the piston, enabling indirect adjustment of winding pressure from the outside without direct mechanical intervention inside the tank, thus simplifying the adjustment operation while accepting the addition of hydraulic system components.
2Reliability
If the winding height changes due to aging or frequent short circuits, then the pressing element must be adjusted, but this requires removing the winding from the tank which is complicated and costly
Solution Approach 1:
The hydraulic actuating unit with external control serves as an intermediary that enables adjustment of the pressing element without removing the winding from the tank. The hydraulic system allows operators to access the actuating mechanism through the tank wall or cover, adjust the piston position to compensate for winding height changes, and maintain consistent winding pressure without the costly and complicated process of complete disassembly.
Solution Approach 2:
The system enables self-adjustment capabilities where the winding pressure can be monitored and corrected in-situ using the drivable pressing element. The actuating unit allows operators to perform maintenance adjustments without external assistance or complex disassembly procedures, improving ease of repair while ensuring reliability through maintainable pressure consistency.
3Adaptability or versatility
If hydraulic or electric pressing elements are used for adjustable pressure, then the winding pressure can be adjusted externally, but the device complexity increases
Solution Approach 1:
The hydraulic or electric actuating unit is designed to perform multiple functions: generating pressing force, enabling pressure adjustment, and potentially providing pressure monitoring capabilities. By integrating these functions into a single modular unit, the system achieves high adaptability for different pressing requirements while managing device complexity through functional consolidation rather than multiple separate components.
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
Enables simple and cost-effective adjustment of winding pressure without disassembling the device, maintaining consistent pressure across temperature fluctuations and ensuring reliable operation.
Implementation Method 1
the pressing element forms a hydraulic chamber (17) which is filled with a hydraulic fluid, wherein the winding pressure is determined by the pressure of the hydraulic fluid in the hydraulic chamber (17)
Implementation Method 2
compensation means for compensating for temperature-related fluctuations in the volume of the hydraulic fluid
Data Source
AI summary
An electrical device for connection to a high-voltage system includes a magnetizable core, at least one winding which encloses a section of the core, a tank which is filled with insulating fluid and in which the core and each winding are disposed, and at least one pressing element, which is surrounded by insulating fluid, for generating a winding pressure. The pressing element is supported on the core and the winding. In order to adjust the winding pressure from the outside in a simple and cost-effective manner, the pressing element is provided as a drivable pressing element and is connected to an actuating unit. The actuating unit is configured to set the winding pressure which is generated by the pressing element.