Stationary Induction Apparatus Electrostatic Shield Ring Design
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Solution Overview
Problem
Existing stationary induction apparatuses face challenges in reducing mechanical force in the axial direction of windings, cross-sectional area of electric wires, eddy current losses, and insulation distance, while also experiencing local temperature rises due to magnetic flux convergence in electrostatic shield conducting rings.
Innovation Solution
A stationary induction apparatus design featuring a main body tank with an iron core, insulating cooling medium, and an electrostatic shield ring with a magnetic ring covered by a conductive tape wound with insulating tape, which redirects leakage flux and reduces eddy current losses by minimizing the linked magnetic flux area and induced electromotive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cross sectional area of electric wires is reduced to decrease material cost, then the electromagnetic force that the winding can withstand decreases
Solution Approach 1:
The non-conductive magnetic ring serves as a structural intermediary that supports and distributes electromagnetic forces axially. By providing this additional structural element, the winding can use thinner wires with reduced material quantity while the magnetic ring helps bear the electromagnetic forces, maintaining the overall strength and withstanding capacity of the winding assembly.
2Force
If the orientation of leakage flux is changed from radial to axial direction using a magnetic ring, then the electromagnetic force orientation changes from axial to radial direction, but this requires additional structural components
Solution Approach 1:
The non-conductive magnetic ring performs multiple functions simultaneously: it redirects leakage flux from radial to axial direction, changes electromagnetic force orientation from axial to radial direction, provides structural support for the winding, and prevents eddy current formation. By consolidating these multiple functions into a single component, the device complexity is minimized while achieving the desired force orientation change.
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 configuration reduces mechanical force, cross-sectional area of electric wires, eddy current losses, and insulation distance, achieving cost reduction and loss minimization while preventing local temperature rises in the electrostatic shield ring.
Implementation Method 1
the orientation of a leakage flux is changed from the winding radial direction to the winding axial direction
Implementation Method 2
eddy current losses produced in the windings are deceased
Implementation Method 3
a leakage flux generated due to the short-circuit current is linked with the winding short-circuit current, and thus a large electromagnetic force is applied to the windings
Implementation Method 4
An insulating cooling medium is sealed in the main body tank, and the stationary induction apparatus main body is immersed in the insulating cooling medium
Data Source
AI summary
A stationary induction apparatus includes a main body tank and a stationary induction apparatus main body. The main body is accommodated in the tank. An electrostatic shield ring is placed on the upper and lower end parts of a winding. An electrostatic shield ring has a magnetic ring and two insulating rings vertically fixing the magnetic ring for a spool. A conductive tape is laid on an insulating tape. These tapes are wound around the spool. An insulating tape is wound around the wound tapes. The width of the insulating tape is equal to or greater than the width of the conductive tape. One end of the conductive tape is connected to one end part of the winding and to the magnetic ring. A gap is provided at at least one place on the magnetic ring. The winding direction of the conductive tape is inverted at at least one place.