Non-magnetic Stainless Steel Disc Spring Stack Maintains 95% Clamping Tension with Silver Plating for Electrical Busbars
High-voltage power transmission systems experience significant temperature fluctuations due to changing electrical loads and environmental conditions. These temperature shifts cause copper and aluminum busbars to expand and contract, which can loosen standard bolted joints over time, increasing electrical resistance and creating fire hazards.
Jiangsu Sanzhong Elastic Technology Co., Ltd. provides an engineered solution with our specialized Disc Spring Stack configurations, designed to maintain constant clamping pressure on high-current electrical connections.
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Stack deflects, absorbing thermal growth
while maintaining target contact pressure
Our disc spring stacks function as live-load washers that absorb thermal movement. By maintaining a constant force on the joint, they prevent the physical deformation known as "aluminum bolt creep," keeping contact resistance low and stable throughout decades of continuous operation. This eliminates the need for frequent manual bolt retightening, reducing maintenance costs for power utility providers.
- Electrical Substation Busbars: Placed within bolted connections of outdoor aluminum and copper busbar runs to prevent joint degradation.
- Power Transformer Terminals: Applied to high-voltage transformer bushings and internal cable termination structures.
- Gas-Insulated Switchgear (GIS): Integrated into internal contact mechanisms to ensure continuous conductivity despite operational temperature swings.
| Parameter | Specification |
|---|---|
| Material Selection | Non-magnetic stainless steel, Inconel X-750, or phosphor bronze alloys to minimize eddy current heating in high AC fields |
| Bolt Size Compatibility | Sized for standard metric electrical fasteners from M6 to M48 and equivalent imperial standards |
| Force Stability | Low load relaxation rates, maintaining over 95% of initial clamping tension over a 25-year operational life |
| Environmental Resistance | Excellent resistance to atmospheric oxidation, industrial pollution, and coastal salt spray |
| Surface Conditioning | Silver, tin, or nickel plating available to improve electrical grounding and minimize galvanic corrosion at the contact interface |
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