High-voltage Disconnector Fault Warning: Investigating The Internal Causes Of Obstructed Closing And Opening

In power transmission and distribution systems, equipment reliability determines the quality of regional power supply. The complexity of the operating environment poses severe challenges to outdoor equipment. The defects of High Voltage Disconnect Switch can cause abnormal opening and closing of the switch to varying degrees.

Performance degradation of mechanical transmission systems

Oxidation and clumping of lubricant inside bearings significantly increase rotational resistance torque. Long-term exposure to wind and rain causes metal surface peeling and geometric deformation in transmission rods. Misalignment of the auxiliary switch in the operating mechanism can prematurely cut off power, causing interruptions in operating commands. During closing, excessive base levelness can cause contacts to deviate from the central axis. These physical displacement deviations can lead to abnormal switching operations to varying degrees due to defects in the high-voltage disconnecting switch.

Electrical contact condition and external factors

Due to prolonged compression, the contact spring undergoes plastic deformation, leading to a decrease in contact pressure and causing abnormal local temperature rise. Electrochemical corrosion of aluminum alloy components generates a high-resistivity oxide layer, hindering current conduction.

• Surface contamination of porcelain insulators: High humidity conditions can induce surface flashover.

• Sealing components aging and cracking: Rainwater seepage causes internal components to rust and seize up.

• Dislodged pins in the transmission components: A broken power transmission chain leads to failure to operate.

• Contact surface burns: Arc erosion causes surface pitting, increasing friction.

The existence of this operational bottleneck underscores the importance of preventative testing. Defects in high-voltage disconnect switches can lead to abnormal opening and closing, directly impacting the safety of grid switching operations. Maintaining the cleanliness of the contact system and adjusting the clearance of the linkage mechanism are key measures to reduce this type of failure rate. Selecting differentiated protective coatings based on the salt spray or dust levels in different regions can significantly slow down the corrosion process of metal components.