Stress Control Assembly for High Voltage Sensors
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Solution Overview
Problem
Electrical stress can lead to partial discharge or dielectric breakdown in voltage sensors, posing safety hazards and equipment damage, especially when high voltage potentials are measured between conductive and dielectric structures with different expansion rates.
Innovation Solution
A stress control apparatus featuring an elongated dielectric member with a metal-plated central bore for optical fibers, a thin metal coating connected to ground, and a conductive insert that operates as a fuse during overcurrent faults, minimizing electrical stress through a smooth tapered transition and conductive adhesive application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conductive structure is used to couple high voltage potential to a voltage sensor, then voltage measurement is enabled, but electrical stress and risk of dielectric breakdown increase
Solution Approach 1:
A dielectric member with a central bore is introduced as an intermediary structure between the high voltage conductive cable and the voltage sensor. The bore provides a controlled pathway for the conductive structure to extend toward the sensor while the dielectric material surrounding it manages electrical stress distribution, preventing dielectric breakdown and enabling safe voltage measurement.
Solution Approach 2:
The dielectric member is designed with a tapered geometry where the central bore gradually increases in diameter from the cable end toward the sensor end. This geometric parameter change creates a smooth transition that distributes electrical stress uniformly along the conductive-dielectric interface, eliminating concentrated stress points that would otherwise cause breakdown.
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 effectively suppresses partial discharge and dielectric breakdown, ensuring the longevity and accuracy of voltage sensors while enhancing safety by isolating optical fibers from high electric fields and preventing current flow during faults.
Implementation Method 1
The central bore, having a very thin plating, isolates the optical fibers from high electric fields as well as operates as a fuse, burning up during an overcurrent fault to prevent electrical current from traveling down the central bore during the fault.
Implementation Method 2
The central bore, having a very thin plating, isolates the optical fibers from high electric fields
Data Source
AI summary
A stress control apparatus for managing effects caused by electrical stress in a high voltage environment, and methods of manufacturing the apparatus. A dielectric tube with a central bore coated with a conductive material has an outer conductive coating on a lower section that is grounded. The central bore carries a high voltage potential from a current-carrying conductor. The grounded coating transitions to the exposed outer dielectric surface along a gradually tapered transition. A conductive insert connects to the central bore and forms an electric field in a space between the insert and the grounded coating. When coated with an epoxy and inserted into the central bore, the insert forms a small gap between an outer surface of the insert and part of the central bore, such that there is no zero potential difference in the gap. Any epoxy that oozes out during insertion will collect in the gap.