Siloxane Dielectric Voltage Divider for Stable Capacitance
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Solution Overview
Problem
Conventional voltage dividers, especially ohmic-capacitive types, face issues with capacitance drift due to moisture absorption and temperature fluctuations, leading to inaccurate voltage measurements over long periods, particularly in humid and temperature-varying environments.
Innovation Solution
A voltage dividing device utilizing a siloxane-based polymer dielectric with diffusion-inhibiting properties, which maintains a constant relative dielectric constant across various temperature and humidity conditions, ensuring stable capacitance and improved frequency transmission behavior, combined with a mechanically stable epoxy-based jacket for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dielectric materials (epoxy resin) are used in the voltage dividing device, then the device structure is simple and easy to manufacture, but the capacitance drifts over time due to moisture absorption and temperature fluctuations
Solution Approach 1:
The patent changes the fundamental parameter of the dielectric material from conventional epoxy resin to siloxane-based polymer. This material substitution provides diffusion-inhibiting properties that prevent moisture penetration, thereby maintaining constant capacitance over long periods despite temperature and humidity variations.
Solution Approach 2:
The patent employs a composite structure combining siloxane-based polymer dielectric with specific capacitor element configurations. The siloxane polymer serves as the base material with embedded capacitor elements, creating a composite system that leverages the moisture-resistant properties of siloxane while maintaining the electrical functionality of the capacitor arrangement.
2Reliability
If the capacitor arrangement is exposed to atmospheric humidity without protection, then the device structure remains simple, but water vapor diffusion into the dielectric causes significant capacitance drift
Solution Approach 1:
The siloxane-based polymer creates an inert environment within the voltage dividing device by preventing water vapor diffusion. The material's molecular structure acts as a barrier that blocks moisture penetration, effectively creating a protected internal environment that maintains stable electrical properties despite external humidity conditions.
Solution Approach 2:
The patent addresses the harmful effect of atmospheric humidity by selecting a dielectric material that naturally resists moisture absorption. The potential harm from environmental exposure is converted into a benefit where the siloxane polymer's inherent diffusion-inhibiting properties protect the capacitor elements, turning the challenge of humidity into an opportunity for enhanced reliability.
3Duration of action of stationary object
If epoxy resin is used as the dielectric material, then the manufacturing process is straightforward, but the dielectric absorbs moisture leading to changed capacitance over the lifetime of the voltage divider
Solution Approach 1:
The patent changes the dielectric material parameter from epoxy resin to siloxane-based polymer, which fundamentally alters the moisture absorption characteristics. This material substitution ensures that the capacitance remains constant over the operational lifetime, thereby maintaining voltage measurement accuracy throughout the device's service life.
Solution Approach 2:
By using siloxane-based polymer, the patent eliminates the need for frequent calibration or replacement that would be required with moisture-absorbing materials like epoxy resin. The long-term stability provided by siloxane reduces the operational lifecycle costs and maintenance requirements, effectively creating a more durable solution.
4Measurement precision
If the dielectric constant changes with temperature and humidity, then the device can adapt to environmental conditions, but the capacitance becomes unstable affecting measurement accuracy
Solution Approach 1:
The patent selects a dielectric material (siloxane-based polymer) whose physical and chemical parameters remain stable across varying temperature and humidity conditions. The material's low dielectric loss and resistance to moisture absorption ensure that the dielectric constant remains constant, thereby maintaining accurate voltage measurements despite environmental fluctuations.
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 solution provides a voltage dividing device with enhanced measurement accuracy and reliability by minimizing capacitance drift and preventing voltage flashovers, ensuring precise voltage measurement over decades, even in harsh environmental conditions.
Implementation Method 1
Siloxane-based polymers, especially solid siloxane polymers, also known as silicone polymers, exhibit diffusion-inhibiting properties. Such polymers as dielectrics are largely insensitive to water vapor diffusion
Implementation Method 2
A major problem with such resistive-capacitive voltage dividers is that the capacitor's capacitance must remain as constant as possible over long periods of time
Implementation Method 3
resistive voltage dividers operate with one or more electrical resistors
Data Source
Figure 1~2
AI summary
The invention relates to a voltage-dividing device (1), comprising a core region (2) having a capacitor assembly arranged in the core region (2) and an electrical resistor (3) arranged in the core region (2), a first electrode (4) of the capacitor assembly having a coupling part (5), a voltage-carrying element being able to be electrically connected to the voltage-dividing device (1) via the coupling part (5), and a second electrode (6) of the capacitor assembly having a grounding part (7), a ground being able to be electrically connected to the voltage-dividing device (1) via the grounding part (7), the first electrode (4) and the second electrode (6) being electrically connected by means of the electrical resistor (3), and the core region (2) comprising a dielectric, which comprises or consists of a siloxane-based polymer. The invention further relates to the arrangement of a voltage-dividing device on a connection part of a switchgear assembly of an electrical grid and to a method for producing the core region.