Self-Modulating Seal for Bushing Insulator Integrity
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Solution Overview
Problem
Electrical bushings face challenges in maintaining insulation medium retention during severe incidents such as earthquakes and dynamic loads, as traditional designs fail to prevent cracking or rupturing due to inability to accommodate large gap formations and asymmetrical separations.
Innovation Solution
The implementation of a self-modulating seal that adjusts its shape and pressure in response to environmental inputs, allowing for large and asymmetrical separation of bushing components, thereby maintaining a fluid/gas tight seal during extreme conditions, including earthquakes and static bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rigid seals are used in bushings, then the seal structure is simple and easy to manufacture, but the seal fails during severe incidents such as earthquakes and dynamic loads due to inability to accommodate large gap formations and asymmetrical separations
Solution Approach 1:
The patent applies the dynamics principle by using a flexible seal member that can dynamically adjust its shape and position in response to varying loads and gaps. The seal transitions from a static rigid structure to a dynamic flexible structure that adapts to asymmetrical separations and large gap formations during seismic events, thereby maintaining seal integrity while accommodating structural movements.
Solution Approach 2:
The patent employs a flexible seal member (such as a gasket or membrane) that can deform elastically to fill gaps formed during bushing separation. This flexible element maintains fluid/gas tight sealing despite large relative movements between bushing components, directly addressing the reliability issue during severe incidents without requiring complex mechanical systems.
2Adaptability or versatility
If the seal is designed to prevent large gap formations, then the seal maintains integrity under normal conditions, but the bushing components cannot accommodate asymmetrical separation during earthquakes and dynamic loads
Solution Approach 1:
The flexible seal member dynamically adapts its configuration to accommodate asymmetrical separation between bushing components. During earthquakes or dynamic loads, the seal deforms to follow the relative movement while maintaining continuous contact with sealing surfaces, thereby providing both adaptability to separation and reliability in seal retention.
Solution Approach 2:
The seal's physical parameters (shape, position, contact pressure) change in response to varying gap conditions. The flexible material allows local deformation to accommodate asymmetrical separation while maintaining overall seal integrity, enabling the system to adapt to different separation scenarios without compromising reliability.
3Ease of operation
If a self-modulating seal is implemented to adjust sealing shape and pressure, then the seal responds to environmental inputs during earthquakes, but the device complexity increases
Solution Approach 1:
The flexible seal member is designed to automatically adjust its own shape and position in response to environmental inputs such as seismic forces and pressure changes. The seal's elasticity and flexibility enable it to self-modulate without external control systems, providing automatic adaptation to varying conditions while avoiding the complexity of active control mechanisms.
Solution Approach 2:
The seal's physical parameters (shape, contact pressure, position) automatically change in response to environmental conditions such as acceleration forces and internal pressure. This passive parameter modulation allows the seal to respond to earthquakes and dynamic loads without requiring complex sensing or actuation systems.
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 self-modulating seal effectively prevents exposure of the bushing core to the external environment, ensuring seal integrity and preventing catastrophic failure, even under violent seismic events, and can withstand IEEE 693-2005 shake table tests at 2.5 g Zero Period Acceleration (ZPA).
Implementation Method 1
a self-modulating seal that adjusts sealing shape and pressure per the direct effects of the sealing environments input based on the bushing and or its components acceleration and their generated forces
Data Source
AI summary
Systems and methods for providing electrical bushings for maintaining a seal during severe incidents are provided. The bushings provide for relatively large gap formations and seal spacings by using one or more self-modulating seals. In certain configurations, the bushings provide for relatively large gap formations and seal spacings by using a wider or narrow top portion adjacent to a relatively narrower middle portion. The systems and methods can be also applied to other apparatus when deemed proper.