Power cable fault detection method

Release time: 2024-09-24

Power cable as power transmission"Blood vessels", its health is directly related to the stability and safety of the entire power grid. In the face of complex cable faults, it is particularly important to choose the appropriate detection method. This article will introduce several commonly used power cable fault detection methods, and further illustrate their advantages and limitations through data analysis.

Infrared thermal imaging method

Data analysis shows that a study on the application effect of infrared thermal imaging shows that infrared thermal imaging can accurately identify heating faults caused by overload or poor contact.95%above failure points, the response time averages10Within minutes. This shows that this method has significant advantages in quickly locating thermal faults and has a low false alarm rate.

High frequency pulse reflection method

Data analysis and comparison: Compared with traditional cable fault finding methods (such as manual inspection, acoustic measurement, etc.), high-frequency pulse reflection method has significantly improved accuracy and efficiency. According to statistics, the high-frequency pulse reflection method can be used in80%In the case of the fault location error is controlled.5meters, which is reduced by about30%The search time. However, the detection effect of this method for high resistance fault is relatively weak, and it needs to be combined with other methods.

Partial discharge detection method

Data analysis case: Through a one-year partial discharge monitoring of a regional power grid, it is found that this method successfully warns of many potential cable failures and avoids power outages caused by failures. Data analysis shows that the partial discharge detection method can advance6-12The identification of signs of cable insulation aging for months greatly reduces the incidence of sudden failures.

Grounding resistance detection method

Data comparison and analysis: As an important means to judge the cable grounding fault, the accuracy of the test results directly affects the effect of fault treatment. Studies have shown that when the grounding resistance value exceeds the standard value (generally4Ω or less), the probability of failure increases significantly. Therefore, by regularly detecting the grounding resistance value and comparing the historical data, the grounding problem can be found and solved in time to avoid the expansion of the fault.

Impact high voltage flashover test method

The data results show that the impact high-voltage flashover test method shows its unique advantages in the detection of high-resistance faults. A set of experimental data shows that the identification rate of the method for high resistance faults is up90%above, and can be in a relatively short period of time (generally not more30minutes) to complete fault location. However, this method requires high equipment requirements, and there are certain safety risks in the operation process, which requires professional personnel to operate.

Intelligent detection method

Data analysis trend: With the development of intelligent technology, intelligent detection method is more and more widely used in cable fault detection. Through the analysis of a large amount of monitoring data, intelligent systems can predict the life of the cable, assess its health, and send early warning signals. Data analysis shows that the failure rate of the power grid using intelligent detection has decreased by about20%At the same time, the pertinence and efficiency of maintenance work are improved.

Through data analysis and comparison, we can see that different power cable fault detection methods have their own advantages and applicable scenarios. In practical applications, the appropriate detection method or a combination of multiple methods should be selected to ensure that cable faults can be found and resolved in a timely and accurate manner based on comprehensive consideration of fault types, site conditions and other factors. In the future, with the continuous progress and innovation of technology, cable fault detection methods will be more intelligent and efficient, providing a more solid guarantee for the stable operation of the power system.

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