Flexible Insulated Busbars

Technical data of electrical conductor

• Copper strips(≥99.9%Cu)
• Surface: uncoated or tinned
• Resi stivi ty: ≤1.785Ωcm² /cm
• Electrical conductivi ty: ≥56Sm/mm²
• Tensil e strength: ≥200N/mm²
• Extensibi lity: ≥30%

Technical data of insulation

• Material : PVC
• Color: black
• Thickness: 1.8-2.1mm
• Shorehardness: A70-80
• Electrical strength: ≥23kV/mm
• Oxygen index: 30%
• Flameretardant; self-extinguishing
• Elastici ty: ≥180% after 7-day aging-test wi th 135℃
• Tensil e strength: ≥20MPa

Technical data of flexibleinsulated busbars

• Operating temperature: -30℃ to +105℃
• Operating voltage: 750V
• Voltage wi thstand performance wi th 15min / 50HzAC:
  • between flexibleinsul ated busbar and earth: ≥15kV
  • between two flexi ble insul ated busbars: ≥30kV

Main features of flexible insulated busbars

• Easy assembly: it could be easily bended and fixed with handsor easy tools.
• Possibility of reducing sizes of the equipment:
  • Due to favorable thermal radi ation properti es, the flexible insul ated busbars canhandl e
    heavier current loads than solid busbars of the same cross-section.
  • Due to good insulating performance of the PVC, i t could be possible to reduce the di stances
    between di fferent flexible insulated busbars and between the flexible insul ated busbars and
    earth.
  • The bendi ng-radius could be smaller than that of normal cable or solid copper bars, so that
    the connections could be more simple and short, and visually it could have better effect.
• Lower temperature riseon the flexi ble insul ated busbars than onnormal copper bars.
• High flexibility: no problem wi th vi brationsor thermal expansions.

Application of flexible insulated busbars

The flexi bil ity of the bars makes i t possible to install them into di fficul t equipment or small places
very easily. They wil l be particul arly well used as connectors i n switchgears and between transformers, switching devi ces and prefabricated power networks.

Dimensions and ampacity

• Standard conductor: copper (99.9%), uncoated or tinned.
• Standard length: 2m(for 1-layer busbar, 25m is possible).
• Cross-section: up to 1200mmm ²
• Color of insulation: black.
• Ampacity: values are only for information because the actual ampacity is related to the application conditions.

Guidance for selecting the correct dimensions

The ampacities are related to the cross-sections and operating ambient temperature,as shown in above table.
Therefore, three factors should be consideredfor deciding the dimensions:

• Ampacity
• Allowed temperature-rise on the bars
• Width of the bars

The temperature-rise(△T) of bars can be calculated wi th following formula:
△T=Tr – Ta

• Ta: ambient temperature
• Tr: temperatureof bars wi th rated current(pay attention: for general electri cal apparatus, Tr
  should be ≤105℃).

Example (justfor reference):

If your operating ambient temperature is 40℃, and you need ampacity 510A with bar width ＜40mm, you could get allowed highest temperature-rise 65K (105℃-40℃=65K), so you coul d decide dimension 32×1×4. With this bar, the highest temperature-rise will be50K with current 520A.