Cable Terminal Voltage Sensor Shielding for Accurate HV Measurement
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Solution Overview
Problem
Existing voltage sensors in medium and high voltage equipment are susceptible to parasitic capacitances and external influences, leading to inaccurate voltage measurements due to their susceptibility to electrical fields and environmental conditions such as rain or humidity, which can cause errors in voltage level measurements and increase partial discharge levels.
Innovation Solution
The integration of shielding electrodes with a resistive voltage divider in a cable connection terminal, where the shielding electrodes are conically shaped with a larger opening diameter at the low voltage side and a smaller opening diameter at the high voltage side, providing integral shielding within the terminal housing to minimize external field effects and enhance dielectric withstand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage sensors are placed in medium or high voltage equipment, then voltage measurement function is achieved, but measurement accuracy deteriorates due to parasitic capacitances and external electrical field influences
Solution Approach 1:
The patent introduces shielding electrodes as intermediary elements between the voltage sensor and the external electrical field environment. These shielding electrodes act as a mediator that blocks or reduces the harmful influence of external electrical fields and parasitic capacitances on the voltage measurement, thereby improving measurement accuracy without compromising the sensor's functionality in high voltage equipment.
2Measurement precision
If shielding electrodes are added to reduce external field influences, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges the shielding electrodes with the existing terminal housing structure, integrating the shielding function into the housing itself rather than adding separate shielding components. This combining approach reduces overall device complexity while still providing the necessary electrical field shielding to improve voltage measurement accuracy.
3Object-affected harmful factors
If integral shielding is implemented in terminal housing, then susceptibility to external fields reduces, but manufacturing complexity increases
Solution Approach 1:
The patent employs conical shielding electrodes with specific geometric parameters (cone angle, height, positioning) that are optimized to provide effective electrical field shielding. By carefully controlling these geometric parameters, the design achieves reduced susceptibility to external fields while maintaining compatibility with standard manufacturing processes for terminal housings.
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 significantly improves the accuracy of voltage measurements by reducing parasitic capacitances and phase errors, allowing for more reliable protection and measurement under various operating conditions, even in challenging environmental conditions.
Implementation Method 1
the voltage sensor has a resistive voltage divider
Implementation Method 2
shielding electrodes are conically shaped with a larger opening diameter at the low voltage side and a smaller opening diameter at the high voltage side, providing integral shielding within the terminal housing to minimize external field effects
Data Source
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AI summary
The invention relates to a medium or high voltage arrangement with cable connection terminal and voltage sensor, wherein the voltage sensor has a resistive voltage divider (3, 5) and shielding electrodes (10, 11). In order to enhance the accuracy of voltage measurement at medium or high voltage pole parts, the voltage sensor is applied as a voltage sensor module, which is integrated in the a further cable connection terminal, and that the shielding electrodes are integral part of the voltage sensor module or integral part of an insulating housing part of the terminal.