1, Observe the fault phenomenon
Observe the fault phenomenon based on the detection results of the cable tester. Common fault phenomena include open circuit, short circuit, low resistance or high resistance grounding, etc. By observing the fault phenomenon, the cause of the fault can be preliminarily determined.
2, Analyzing the causes of faults, common causes of faults include the following:
1. Mechanical damage: Mechanical damage is one of the main causes of cable failure, including cable compression, bending, cutting, etc. By observing the appearance and historical records of the cable, it can be determined whether there is mechanical damage;
2. Insulation aging: Insulation aging is another common cause of cable failures. Due to long-term use or environmental factors such as high temperature and humidity, insulation materials gradually lose their elasticity, resulting in phenomena such as cracks and detachment, leading to a decrease in insulation performance. By observing the appearance and historical records of the cable, it can be determined whether there is insulation aging;
3. Natural disasters: Natural disasters such as floods, earthquakes, etc. may also cause cable failures. This type of malfunction is generally sudden and the degree of damage is quite severe;
4. Human factors: Human factors are also one of the causes of cable failures, such as improper construction, malicious damage, etc. By understanding the situation and personnel activities at the time of the incident, it is possible to determine whether there are human factors involved;
5. Quality issues: Quality issues with the cable itself may also lead to malfunctions. For example, there may be defects or the use of substandard materials during the cable manufacturing process. By understanding the manufacturing and usage of cables, it is possible to determine whether there are quality issues.
3, Conduct targeted testing
1. Voltage withstand test: For faults such as insulation aging, voltage withstand test can be conducted to verify. Place the cable in a high-voltage environment and observe whether there is discharge, breakdown, or other phenomena to determine whether the insulation performance is good;
2. Partial discharge detection: For situations where there are defects in insulation materials, partial discharge detection methods can be used. By applying voltage at both ends of the cable, observe whether there is partial discharge phenomenon to determine whether there is a defect in the insulation material;
3. Infrared thermal imager detection: For situations where overheating is caused by excessive current, an infrared thermal imager can be used for detection. By observing the temperature distribution on the surface of the cable, it is possible to determine whether there is overheating and thus identify the location and cause of the fault;
4. Component analysis: For situations where corrosion is caused by environmental factors, component analysis can be performed. By analyzing the chemical composition of cable materials, the presence of corrosion can be determined, and corresponding protective measures can be determined;
5. Other professional testing methods: There are many other professional testing methods to choose from for different materials and types of faults. Suitable detection methods and tools such as acoustic wave detection and bridge method can be selected according to the actual situation for targeted detection to further confirm the cause and location of the fault.