Temperature-Stable Capacitor for High-Voltage Line Measurements
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Solution Overview
Problem
High-voltage equipment capacitors face challenges in maintaining accurate voltage measurements due to material expansion and contraction from temperature variations and non-uniform gas density caused by environmental and operational conditions, which affect the capacitance and dielectric permittivity.
Innovation Solution
Incorporating a temperature-sensitive resistor on the printed circuit of the capacitor allows for precise temperature measurement near the dielectric, correcting for permittivity variations and thermal effects, while a metal screen protects the resistor from high voltage, and the low-voltage electrode is servo-controlled to a reference voltage to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If temperature variations are allowed to occur in the capacitor, then the capacitor can operate under normal climatic and operating conditions, but the capacitance value changes due to material expansion and contraction
Solution Approach 1:
The patent introduces temperature-sensitive resistors whose resistance changes with temperature, allowing the system to detect and compensate for temperature-induced capacitance variations. By monitoring resistance changes in the temperature-sensitive resistors, the system can calculate temperature corrections to maintain accurate voltage measurements despite thermal expansion and contraction of capacitor materials.
Solution Approach 2:
The patent implements a feedback mechanism where temperature-sensitive resistors continuously monitor temperature changes in the capacitor, and this information is used to adjust the measured capacitance value. The servo-controlled low-voltage electrode also provides feedback to maintain a reference voltage, enabling real-time compensation for thermal effects on measurement accuracy.
2Adaptability or versatility
If gas density is allowed to vary due to environmental conditions, then the capacitor can operate in different environments, but the dielectric permittivity changes affecting measurement accuracy
Solution Approach 1:
The patent uses temperature-sensitive resistors to detect temperature changes that correlate with gas density variations. Since gas density affects dielectric permittivity, and permittivity affects capacitance, the system uses temperature compensation to indirectly compensate for density-related measurement errors, maintaining accuracy across different environmental conditions.
3Measurement precision
If a temperature-sensitive resistor is added to the printed circuit, then temperature compensation can be achieved, but the device complexity increases
Solution Approach 1:
The patent integrates temperature-sensitive resistors directly into the existing printed circuit board that forms the low-voltage electrode. By combining the temperature sensing function with the existing electrical structure, the patent avoids adding separate temperature sensors and their associated mounting hardware, thereby minimizing the increase in device complexity while achieving temperature compensation.
4Reliability
If a metal screen is added to protect the temperature-sensitive resistor, then high voltage protection can be provided, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a metal screen as an intermediary element positioned between the high-voltage electrode and the temperature-sensitive resistor. This thin conductive layer provides electrostatic shielding and high-voltage protection without requiring substantial structural modifications or complex assembly procedures, balancing reliability improvement with manufacturing feasibility.
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 highly temperature-stable capacitor with improved accuracy in measuring gas density and temperature, effectively correcting for capacitance variations and ensuring reliable voltage measurements across varying conditions.
Implementation Method 1
the printed circuit (CI) also has at least one temperature-sensitive resistor (TH)
Implementation Method 2
a metal screen (EM) is interposed between the temperature-sensitive resistor and the high-voltage electrode (HT) so as to protect the temperature-sensitive resistor from the influence of the high voltage
Implementation Method 3
its dielectric is the gas with which the casing is filled
Implementation Method 4
The stability and the accuracy of the measurement are dependent on the stability and on the accuracy of the capacitance Cht
Data Source
AI summary
A highly temperature-stable capacitor for taking measurements on a high-voltage line, said capacitor having a high-voltage electrode (HT), an annular printed circuit (CI) surrounding said high-voltage electrode (HT) coaxially and having at least one electrically conductive track that forms a low-voltage electrode (BT), said capacitor being characterized in that the printed circuit (CI) also has at least one temperature-sensitive resistor (TH).