Article Overview
Pinggao 35kV busbars are typically copper or aluminum conductors in gas-insulated switchgear, designed for medium-voltage distribution with rated currents up to several kiloamperes, following IEC standards for thermal and electrical performance.
Electrical Parameters
- Rated Voltage: 35 kV AC, suitable for medium-voltage distribution systems .
- Rated Current: Depends on busbar cross-section and material; typical copper busbars carry 1.0–1.6 A/mm², while aluminum busbars carry 0.7–1.2 A/mm² .
- Short-Circuit Withstand: Designed to handle short-circuit currents according to IEC 62271 series, with mechanical endurance up to 10,000 operations for circuit breakers .
- Insulation: Gas-insulated (SF6) enclosures provide compact, hermetically sealed insulation, reducing space requirements and improving safety .
Mechanical and Thermal Parameters
- Material: Copper or aluminum, with surface finish options (bare, tinned, or painted) to reduce contact resistance .
- Cross-Section: Determined by design current and allowable temperature rise; calculated using A_min = I / J, where I is design current and J is current density .
- Temperature Rise: Typically limited to 70 K above 35°C ambient, following IEC 61439-1 guidelines .
- Mounting Orientation: Horizontal flat or edgewise, with derating factors applied for multiple conductors or enclosure constraints .
Design and Operational Features
- Busbar Configuration: Single-busbar or double-busbar arrangements are supported in Pinggao GIS .
- Safety: Capacitive voltage detection systems allow verification of safe isolation; all high-voltage parts are metal-enclosed and safe-to-touch .
- Service Life: Expected ≥40 years under normal operating conditions, limited by switching device cycles .
- Standards Compliance: Designed according to IEC 61439 for busbar assemblies and IEC 62271 for medium-voltage switchgear .
Summary
Pinggao 35kV busbars in GIS systems are compact, high-reliability conductors designed for medium-voltage power distribution. They combine high current capacity, thermal stability, and mechanical endurance with SF6 insulation for safe, long-term operation. Proper sizing involves selecting the material, cross-section, and current density while considering temperature rise, derating factors, and IEC compliance .
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