Voltage Converter Single-Layer Winding Harmonic Distortion
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Solution Overview
Problem
Inductive voltage converters used in low and medium voltage networks suffer from natural oscillations that distort the transmission of harmonics, limiting the ability to accurately measure harmonics and THD values beyond 1.5 kHz, making it impossible to determine harmonics in these networks effectively.
Innovation Solution
The design incorporates multiple primary coils connected in series, with at least some turns wound as single-layer circuits, which reduces natural oscillations and distortions, allowing for accurate transmission and measurement of harmonics across a broader frequency range, including frequencies like 16.7 Hz, 60 Hz, and 400 Hz, while maintaining a robust and low-maintenance structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inductive voltage converters are used to reduce voltage for measurement, then low-voltage measuring devices can be used, but natural oscillations in the converter distort harmonic transmission and limit measurement accuracy above 1.5 kHz
Solution Approach 1:
The patent changes the electrical parameters of the voltage converter by connecting capacitors in parallel to the primary coil, which modifies the converter's natural oscillation frequency and damping characteristics. This parameter adjustment allows the converter to transmit harmonics up to 9 kHz with acceptable distortion, resolving the contradiction between using inductive converters and achieving accurate harmonic measurements.
2Reliability
If capacitors are connected in parallel to reduce natural oscillations, then harmonic transmission improves, but the system becomes maintenance-intensive and requires high dielectric strength
Solution Approach 1:
Instead of adding capacitors that increase complexity and maintenance, the patent changes the winding configuration parameter - using single-layer circuits in at least one primary coil. This structural parameter change achieves the same goal of reducing natural oscillations and improving harmonic transmission without introducing additional maintenance-intensive components.
3Power
If inductive voltage converters are used, then voltage transformation is achieved, but the transformation ratio becomes non-linearly distorted at frequencies above 1.5 kHz
Solution Approach 1:
The patent modifies the winding structure parameter by implementing single-layer circuits, which changes the magnetic coupling characteristics and reduces non-linear distortions. This allows the voltage converter to maintain a linear transformation ratio across a broader frequency range up to 9 kHz, preserving both transformation capability and precision.
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 enables precise transformation ratios, allowing for the accurate observation of power quality in low and medium voltage networks, transmitting harmonics with minimal distortion, and is suitable for switchgear applications.
Implementation Method 1
Basically, inductive voltage converters are known as voltage converters. These work on the principle of the transformer.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to voltage transformers (10), particularly for low- and medium-voltage networks, comprising at least one primary coil (1.1, 1.2, 1.3, 1.4), at least one secondary coil (2, 2.1, 2.2, 2.3, 2.4), and at least one coil core (3, 3.1, 3.2, 3.3). The at least one secondary coil (2, 2.1, 2.2, 2.3, 2.4) is arranged around a coil core (3.1, 3.2, 3.3) or around a portion of the coil core (3). The at least one primary coil (1.1, 1.2, 1.3, 1.4) is in turn arranged around a secondary coil (2.1, 2.2, 2.3, 2.4) or around a portion of a secondary coil (2). If several primary coils (1.1, 1.2, 1.3, 1.4) are provided, they are connected in series. According to the invention, at least some of the windings of a primary coil (1.1, 1.2, 1.3, 1.4) are wound as layers with single-layer connection.