High Voltage Sensor in Line Insulator
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Solution Overview
Problem
Conventional high voltage sensors for electric power systems are large, heavy, and prone to accuracy degradation due to stray capacitance, environmental contamination, and weather-related factors, making them impractical for phase-over-phase poles and distribution circuits.
Innovation Solution
A voltage monitor is integrated within a dielectric canister inside a high voltage insulator, featuring a dumbbell-shaped floating sensor capacitively coupled to high and low voltage shields, minimizing size, weight, and environmental impact while maintaining accuracy through capacitive coupling and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional high voltage sensors are used, then voltage measurement capability is provided, but the sensors are large and heavy making them impractical for phase-over-phase poles
Solution Approach 1:
The voltage sensor is merged with the line insulator structure, where the insulator serves as both the electrical insulation component and the housing for the voltage sensing elements. The insulator body incorporates internal electrodes and dielectric materials that function as the voltage sensor, eliminating the need for separate external sensor housings and reducing overall weight.
Solution Approach 2:
The line insulator is designed to perform multiple functions: providing electrical insulation between conductors and serving as the voltage measurement device. The insulator's dielectric structure and internal geometry are utilized for both mechanical support and capacitive voltage sensing, reducing the need for additional dedicated sensor components.
2Weight of moving object
If lightweight high voltage sensors are used, then weight is reduced, but accuracy is severely affected by stray capacitance from adjacent voltage sources
Solution Approach 1:
A shielded configuration is introduced where conductive shields and dielectric materials are positioned between the sensing electrodes and adjacent voltage sources. These intermediary elements block stray capacitive coupling from neighboring conductors, isolating the voltage measurement from external electromagnetic interference while maintaining the lightweight sensor design.
Solution Approach 2:
The insulator structure incorporates localized regions with different dielectric properties and conductive shielding elements positioned strategically around the sensing electrodes. This local modification of electrical properties creates controlled electric field distribution that minimizes interference from adjacent voltage sources while maintaining overall sensor lightness.
3Ease of manufacture
If sensors are exposed to environment, then installation is simple, but accuracy is degraded by rain, crud accumulation, temperature changes and pollution
Solution Approach 1:
The voltage sensing elements are nested within the enclosed cavity of the line insulator structure. The insulator housing completely encloses the electrodes and dielectric materials, protecting them from environmental exposure while maintaining electrical functionality. This nested configuration shields the sensitive measurement components from rain, pollution, and temperature variations.
Solution Approach 2:
The insulator interior creates a protected, electrically controlled environment for the voltage sensing elements. The dielectric materials and conductive shields within the insulator establish a stable electrical field configuration that is isolated from external environmental factors, ensuring consistent measurement accuracy regardless of weather conditions or pollution levels.
4Object-affected harmful factors
If the high voltage conductor passes through the sensor housing, then environmental contamination is minimized, but a relatively large diameter housing is required
Solution Approach 1:
Instead of having the conductor pass through the sensor housing, the configuration is inverted: the sensor electrodes and dielectric elements are positioned within the insulator, and the high voltage conductor is routed externally around the insulator structure. This reversal eliminates the need for a large-diameter housing while still protecting the sensing elements from environmental contamination.
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 lightweight, accurate, and cost-effective voltage measurement system that is not affected by environmental contaminants, suitable for various voltage applications, including phase-over-phase power line poles and circuit interrupters, with minimal additional size or weight.
Implementation Method 1
capacitive coupling between the sensor and the shields causes the floating sensor to assume a voltage between the high voltage shield and the low voltage shield
Data Source
AI summary
A high voltage sensor is located within a dielectric canister inside a high voltage power line support insulator. A space through the voltage sensor accommodates a mechanical connecting rod associated with a circuit interrupter switch located in another section of the support insulator. An electrically floating dumbbell-shaped sensor extending between and capacitively coupled to high voltage and low voltage shields assumes a midpoint voltage value between the shields. A sensor plate or other suitable pickup capacitively coupled to the dumbbell sensor provides a voltage measurement, which is calibrated to provide a measurement of the power line voltage. This solution allows a voltage sensor to be added to or integrated in conventionally sized power line support insulators with no additional size, negligible additional weight, and minimal additional cost.