The voltage rating notation on electrical cables follows a standard international convention established by IEC and VDE standards. When you see a cable rated 6.6/6.6kV, this notation encodes two critical electrical parameters that determine the cable's safe operating limits. 电气电缆上的电压额定值标识遵循由IEC和VDE标准确定的标准国际约定。当您看到电缆额定为6.6/6.6kV时，此标识编码了两个关键电气参数，这些参数决定了电缆的安全工作限制。 Uo (Phase-to-Earth Voltage): The first number in the Uo/U notation represents the maximum phase-to-earth voltage (voltage between a phase conductor and ground or metal shielding) that the cable insulation is designed to withstand continuously. For a 6.6/6.6kV cable, Uo = 6.6kV phase-to-earth. U (Phase-to-Phase Voltage): The second number represents the maximum phase-to-phase voltage (voltage between any two phase conductors) the cable can handle. For a 6.6/6.6kV cable, U = 6.6kV phase-to-phase. Standard Relationship in TN Systems: In conventional European TN earthing systems (where the neutral is directly grounded at low impedance), the relationship between Uo and U is: Uo = U/√3 ≈ 0.577U. Therefore, a standard 6.6kV system would normally use 3.8/6.6kV cables (since 6.6/√3 ≈ 3.8kV). However, Australian mining cables specify 6.6/6.6kV, indicating a fundamentally different earthing system design.

on05/03/2026

Phase-to-Earth Voltage: Decoding “Uo” Rating on Australian (N)TSKCGEWÖU 6.6/6.6kV BOMs

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