Power Switchgear Grease Pool Friction Control
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Solution Overview
Problem
Conventional gas insulated switchgear experiences increased frictional force and reduced insulation performance due to heat generation and lubricant degradation during sliding operations, leading to potential damage and scattering of foreign matters.
Innovation Solution
The design incorporates ring-shaped sliding members and grease pools between the contactor and sliding members to stabilize the frictional force and prevent foreign matter scattering, ensuring consistent contact resistance and insulation performance by maintaining the sliding elements within an allowable deformation range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard film is applied to the movable contactor to reduce wear, then the sliding characteristics are improved, but heat is generated during sliding which can damage the film and increase contact resistance
Solution Approach 1:
A grease pool is introduced as an intermediary substance between the sliding portions of the movable conductor and contactor. The grease acts as a mediator that reduces direct metal-to-metal contact, thereby reducing heat generation while maintaining the hard film's protective function. The grease pool absorbs and dissipates heat, preventing temperature buildup that would damage the hard film.
2Duration of action of moving object
If the sliding portion operates for a long period, then the apparatus achieves sustained operation, but the lubricant scatters or deteriorates leading to increased friction and reduced insulation performance
Solution Approach 1:
The grease pool is pre-filled and positioned beforehand to cushion and protect the sliding portions during extended operation. This prior cushioning ensures that lubrication is maintained throughout the operational duration, preventing lubricant scattering and deterioration. The grease pool acts as a reservoir that continuously supplies lubrication, maintaining low friction and preserving insulation performance over time.
3Reliability
If the hard film scratches during sliding, then wear occurs, but the scratched film scatters as foreign matters reducing insulation performance
Solution Approach 1:
The grease pool serves as an intermediary that captures and contains scratched film particles and foreign matters generated during sliding. Instead of allowing these particles to scatter into the insulation space, the grease pool traps them within the lubricant medium, preventing insulation degradation while maintaining the wear-resistant function of the hard film.
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 effectively reduces contact resistance and prevents the scattering of foreign matters, maintaining low frictional force and insulation performance over time, thus enhancing the reliability of the switchgear.
Implementation Method 1
At least one grease pool is provided between the contactor and the sliding members
Implementation Method 2
During its sliding, the hard film portion comes into contact with the electric contact point to generate heat caused by the resistance of the hard film
Data Source
AI summary
Disclosed is a power switch gear that includes: a fixed electrode and a movable electrode disposed opposite to each other in a tank filled with insulting gas; and a movable conductor electrically connecting the fixed electrode and the movable electrode together. The fixed electrode and the movable electrode have a contactor through which current flows to the movable conductor. At least one of the fixed electrode and the movable electrode has ring-shaped sliding members, the ring-shaped sliding members being disposed, on both sides of the contactor. At least one grease pool is provided between the contactor and the sliding members.