Shielded Sensored Insulation Plug for Accurate HV Voltage Sensing
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Solution Overview
Problem
Existing voltage sensing devices in high-voltage and medium-voltage power networks are susceptible to inaccuracies due to external electrical fields affecting the primary capacitor, leading to less precise voltage determination.
Innovation Solution
A sensored insulation plug with a shield electrode arranged around the sensing electrode to shield against external electrical fields, enhancing the accuracy of voltage sensing by reducing the impact of external fields on the primary capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the primary capacitor is used for high-accuracy voltage sensing, then voltage measurement precision is improved, but external electrical fields affect the electrode potential causing measurement errors
Solution Approach 1:
A shield electrode is introduced as an intermediary element between the external environment and the sensing electrode. This shield electrode, connected to ground potential, intercepts external electrical field lines and prevents them from directly affecting the sensing electrode, thereby eliminating measurement errors caused by external fields while preserving the capacitive voltage divider's measurement function
2Measurement precision
If a shield electrode is added to protect against external fields, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The shield electrode serves multiple functions simultaneously: it acts as an electromagnetic shield against external fields, provides an additional insulating barrier within the plug body, and can be integrated into the existing insulation material structure. This multi-functionality approach improves measurement accuracy without proportionally increasing device complexity
Solution Approach 2:
The shield electrode is nested within the insulation plug body, with the sensing electrode nested within the shield electrode's protective field. This nested configuration allows multiple protective and functional layers to be compactly arranged without significantly increasing the overall external dimensions of the insulation plug
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 shield electrode effectively shields the sensing electrode, improving the accuracy of voltage sensing and reducing the dependence of the capacitance of the primary capacitor on external fields, thereby enhancing the predictability of the voltage divider.
Implementation Method 1
c) a shield electrode of generally tubular shape, embedded in the plug body, arranged around the sensing electrode and extending in axial directions at least between the first axial edge position and the second axial edge position, comprising a protruding portion extending in axial direction beyond the first axial edge position, such as to enhance electrical shielding, by the shield electrode, of the sensing electrode against external electrical fields
Data Source
AI summary
A sensored insulation plug for a medium-voltage or high-voltage separable connector in a power distribution network of a national grid, and operable to insulate a connection element of the separable connector on elevated voltage and to sense the elevated voltage. The sensored insulation plug has an outer shape generally symmetrical about a plug axis defining axial directions and radial directions, and comprises a plug body formed by an insulating material, and a primary capacitor, operable as a high-voltage capacitor in a voltage divider for sensing the elevated voltage. The primary capacitor has a high-voltage electrode for direct electrical connection to the elevated voltage, a sensing electrode of a tubular shape, embedded in the plug body, arranged around the high-voltage electrode and extending, in axial directions, between a first axial edge position (B) and a second axial edge position (A), and a dielectric formed by a portion of the insulating material arranged between at least a portion of the sensing electrode and at least a portion of the high-voltage electrode. A shield electrode of generally tubular shape, embedded in the plug body, is arranged around the sensing electrode and extending in axial directions at least between the first axial edge (B) position and the second axial edge position (A), and comprises a protruding portion extending in axial direction beyond the first axial edge position (B), such as to enhance electrical shielding, by the shield electrode, of the sensing electrode against external electrical fields.