Center-Tapped HV Winding Layout for Low-Loss Reactive Compensation
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Solution Overview
Problem
Existing high-voltage network devices for reactive power compensation suffer from significant stray field losses due to the large distance required between high-voltage windings and core sections at different potentials, leading to undesirable heating and inefficiencies.
Innovation Solution
The implementation of a center connection for high-voltage windings, allowing both windings to be connected via their center to the high-voltage connection, reduces the distance between winding ends and core yokes, thereby minimizing stray magnetic fields and losses, and incorporates a saturation switching branch with power semiconductor switches and a control unit for precise core saturation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high-voltage windings are positioned at a large distance from the core, then dielectric strength is ensured, but stray field losses increase and device size increases
Solution Approach 1:
The high-voltage winding is divided into two separate windings (first high-voltage winding and second high-voltage winding) positioned on opposite sides of the core. Each winding is connected to the high-voltage terminal through its own center connection, creating a segmented structure that reduces stray field losses while maintaining dielectric strength through distributed positioning.
Solution Approach 2:
The patent introduces a center connection dimension to the winding structure, connecting the midpoint of each winding to the high-voltage terminal. This dimensional change in connection topology allows the winding ends to be positioned closer to the core while maintaining electrical isolation, thereby reducing stray field losses without compromising dielectric strength.
2Loss of energy
If high-voltage windings are positioned at a large distance from the core, then dielectric strength is ensured, but device weight increases
Solution Approach 1:
The high-voltage winding is divided into two separate windings (first high-voltage winding and second high-voltage winding) positioned on opposite sides of the core. Each winding is connected to the high-voltage terminal through its own center connection, creating a segmented structure that reduces stray field losses while maintaining dielectric strength through distributed positioning.
Solution Approach 2:
The patent introduces a center connection dimension to the winding structure, connecting the midpoint of each winding to the high-voltage terminal. This dimensional change in connection topology allows the winding ends to be positioned closer to the core while maintaining electrical isolation, thereby reducing stray field losses without compromising dielectric strength.
3Loss of energy
If high-voltage windings are positioned at a large distance from the core, then dielectric strength is ensured, but device volume increases
Solution Approach 1:
The high-voltage winding is divided into two separate windings (first high-voltage winding and second high-voltage winding) positioned on opposite sides of the core. Each winding is connected to the high-voltage terminal through its own center connection, creating a segmented structure that reduces stray field losses while maintaining dielectric strength through distributed positioning.
Solution Approach 2:
The patent introduces a center connection dimension to the winding structure, connecting the midpoint of each winding to the high-voltage terminal. This dimensional change in connection topology allows the winding ends to be positioned closer to the core while maintaining electrical isolation, thereby reducing stray field losses without compromising dielectric strength.
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 stray field losses, results in a more compact and lighter device, and allows for efficient reactive power compensation by controlling the inductive and capacitive effects of the high-voltage windings.
Implementation Method 1
at least one saturation switching branch configured for saturating at least one core section and comprising controllable power semiconductor switches
Implementation Method 2
the other winding, which is not currently carrying the alternating current, can be supplied with a direct current to saturate the core section it encloses to the desired degree
Data Source
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AI summary
The invention relates to a device (1) for reactive power compensation in a high voltage network (17) comprising at least one phase conductor (16, 18, 19). The device according to the invention (1) has a high voltage connection (8) for each phase conductor. A first and a second core portion (3, 4) which are part of a closed magnetic circuit, a first high voltage winding (5) which surrounds the first core portion, a second high voltage winding (6) which surrounds the second core portion and is connected in parallel to the first high voltage winding, at least one saturation switching branch (10, 11) which is designed to saturate at least one core portion (3, 4) and has controllable power semiconductor switches (20, 21, 22, 23), and a control unit (26) for controlling the power semiconductor switches (20, 21, 22, 23) are provided for each high voltage connection (8). In order to avoid leakage field losses, at least one high voltage winding is equipped with a central connection and is connected at the winding ends thereof to the saturation switching branch. The central connection (50), however, is connected to the high voltage connection (8).