Bolt-type Tension Clamps May Experience Bolt Loosening. These Potential Hazards Should Not Be Ignored.

In routine inspections of power lines, the operating condition of the bolted type strain clamp clamp directly affects the conductor gripping force. If the tightening torque is insufficient, the contact resistance between the clamp and the conductor will rise rapidly. This change, often imperceptible to the naked eye, can induce localized overheating or even burn the conductor, leading to serious consequences.

Analysis of the Causes of Decreased Connection Reliability

Cable clamps are exposed to the outdoor environment for extended periods, experiencing multi-dimensional effects:

• Wind-induced vibration: Continuous high-frequency vibrations of the conductor in light winds constantly disrupt the frictional balance between the threads.

• Temperature stress: Seasonal expansion and contraction cause periodic fluctuations in the internal stress of the material.

• Initial torque deviation: If the specified standards are not met during installation, displacement can easily occur during later operation.

• Oxidation and corrosion: Electrochemical reactions occur between the aluminum alloy clamp and the steel bolt under the influence of rainwater, and the corrosion layer can widen the contact surface or weaken the preload.

Key Maintenance Points for Bolted Tension Clamps

Regarding the loosening of bolted tension clamps, it is recommended to check from the following practical aspects:

Quantitative Monitoring of Tightness

Regularly checking with a torque wrench is a basic operation. It is recommended to establish detailed maintenance records, recording the installation date and torque values ​​of each bolted tension clamp.

Assessment of Contact Surface Condition

Check for scattered or discolored aluminum strands at the clamp outlet. If obvious slippage scratches are found on the bolt head, it indicates that the internal preload has fallen below the safe threshold.

Comprehensive Consideration of Environmental Impact

In coastal or heavily polluted industrial areas, the integrity of the anti-corrosion coating of dead end strain clamp clamps is crucial. Salt spray accelerates the performance degradation of the threaded engagement, leading to premature fastener failure.

Regular infrared thermography and torque retesting can detect abnormal temperature rises in bolted dead end clamp clamps early. This is not only to reduce the risk of wire breakage but also to extend the service life of the entire line. If you are dealing with a similar fault, it is recommended to start with the physical factors mentioned above and develop a targeted repair plan.