The installation of 66kV high-voltage cables must adhere to strict international and local standards to ensure safety, reliability, and long-term performance. The primary international standard governing the design, manufacture, and testing of 66kV cables is IEC 60840. This standard specifies requirements for cables with extruded insulation and their accessories. During the laying process, key specifications to follow include:

• Pulling Tension: The maximum allowable pulling tension must be carefully calculated and monitored to prevent damage to the cable. This is typically based on the conductor's cross-sectional area and material (e.g., copper or aluminum), with a safety factor applied. Our specialized hydraulic Cable Pulling Winches are equipped with a line tension indicator to ensure the pulling force remains within safe limits.

• Bending Radius: The cable's minimum bending radius must be maintained during both installation and its final operating position to avoid stress on the insulation and conductor. For 66kV cables, the minimum dynamic bending radius is generally specified to be 20 times the cable's outer diameter, and for static operation, it is typically 15 times the outer diameter.

• Trench Dimensions: The size of the trench and the type of backfill material are critical for the cable's thermal performance and long-term health. The trench must be wide and deep enough to ensure proper spacing between cables and to maintain the correct depth of cover.