The common faults and causes of high-voltage cables in X-ray machines can be summarized as follows:
1、 Fault phenomenon: High voltage cable breakdown
Reason for manufacturing cable body:
Insulation eccentricity and uneven insulation shielding thickness.
There are impurities inside the insulation and protrusions on the inner and outer shields.
Uneven cross-linking and cable moisture.
Poor sealing of cable metal sheath.
Reasons for manufacturing cable joints:
Cable joints are prone to faults, especially at the insulation shielding fracture of cables, where electrical stress is concentrated.
The quality of joint manufacturing directly affects the operation of cables. In the past, joint manufacturing often used winding type, mold casting type, molding type, and other types. The on-site production workload was large, which easily caused air gaps and impurities between the insulation tape layers, leading to faults.
Construction quality reasons:
The on-site conditions are relatively poor, making it difficult to control temperature, humidity, dust, and other factors.
During cable construction, small scratches may be left on the insulation surface, and non-conductive particles and impurities on the sandpaper may be embedded in the insulation.
The insulation exposed to the air during the joint construction process may inhale moisture, leaving hidden dangers for long-term operation.
Failure to strictly follow the construction process or process regulations during installation may result in potential issues.
The DC withstand voltage test may generate a reverse electric field inside the joint, causing insulation damage.
Poor sealing treatment may also lead to malfunctions.
External force damage:
Cables may be damaged by external forces during storage, transportation, laying, and operation.
In ground construction of other projects, directly buried cables that have already been in operation are prone to damage.
Corrosion of protective layer:
The electrochemical corrosion of underground stray currents or chemical corrosion of non neutral soil may cause the protective layer to fail and lose its protective effect on insulation.
Hospital equipment configuration and installation issues:
The configuration of the X-ray machine is low, and there is no controllable silicon zero phase closing device for the high-voltage primary. The arc extinguishing device for the high-voltage primary relay is not good, which can easily generate arc surges. Sudden increases in the high-voltage secondary voltage can easily cause breakdown of the high-voltage cable.
Neglecting the production, installation, and connection of grounding wires during the installation of X-ray machines often results in simple grounding wire connection devices. Over time, poor contact often leads to electrical leakage.
Time factor:
Over time, the cable ages, the X-ray machine head rotates back and forth, and the insulation layer of the high-voltage cable cracks, which can easily cause cable breakdown.
2、 Fault location:
Faults often occur near the high-voltage cable plug of the X-ray machine.
The above is a detailed summary of common faults and their causes in high-voltage cables in X-ray machines. In practical operation, it is necessary to comprehensively consider various factors and take corresponding preventive measures to ensure the normal operation of the X-ray machine and the patient’s health.
Post time: Dec-17-2024