How does the small current grounding line selection device help detect single-phase grounding faults and reduce the power outage time caused by the fault?
Publish Time: 2025-04-28
In the power system, single-phase grounding fault is one of the more common fault types, especially in the small current grounding system. If this type of fault cannot be detected and handled in a timely and accurate manner, it may lead to more serious power grid accidents, causing large-scale power outages and economic losses. As an advanced technical means, the small current grounding line selection device effectively improves the detection accuracy and response speed of single-phase grounding faults by adopting a high-reliability industrial-grade "fully embedded" structure, a comprehensive line selection algorithm combining steady-state quantities and transient quantities, and using fuzzy theory for information fusion, thereby greatly reducing the power outage time caused by the fault.
The small current grounding line selection device adopts a fully embedded structure design, which means that its hardware and software have been specially optimized to adapt to the complex and changeable power environment. This design not only improves the stability and anti-interference ability of the system, but also ensures that the equipment can operate stably for a long time under harsh conditions. Compared with traditional discrete components or semi-integrated solutions, the fully embedded structure can better cope with the influence of external factors such as electromagnetic interference and temperature changes, ensuring the continuity and accuracy of the fault detection process.
2. Comprehensive line selection algorithm combining steady-state quantity and transient quantity
In order to improve the detection accuracy of single-phase grounding faults, the small current grounding line selection device introduces a comprehensive line selection algorithm combining steady-state quantity and transient quantity. Steady-state quantity refers to the data collected under the normal operation of the system, such as the effective value of voltage and current; while transient quantity refers to the high-frequency signal generated instantly when a fault occurs. By analyzing the data in these two different states at the same time, we can have a more comprehensive understanding of the changes before and after the fault occurs, so as to make a more accurate judgment.
For example, in some cases, relying solely on steady-state quantity may not accurately distinguish normal fluctuations from actual faults, but after adding transient quantity analysis, the fault point can be quickly located by capturing the special signal characteristics generated at the moment of the fault. This method is particularly suitable for small current grounding faults that are difficult to identify with traditional methods.
3. Information fusion using fuzzy theory
In addition to the above two data analysis methods, the small current grounding line selection device also applies fuzzy theory for information fusion. Fuzzy theory is a mathematical tool for dealing with uncertainty and ambiguity, which is very suitable for solving complex fault diagnosis problems in power systems. By fuzzifying the results of multiple fault line selection methods and calculating the comprehensive fault measurement coefficient of each line (i.e., line fault credibility coefficient), the device can integrate information from different sources under a unified framework to form the final fault judgment result.
Specifically, after the fuzzy information fusion between multiple fault line selection methods is completed, each line will get a value reflecting the probability of its failure - the line fault credibility coefficient. The higher this coefficient is, the more likely it is that the line has a fault. Based on such an evaluation mechanism, operation and maintenance personnel can locate the fault location more quickly, take corresponding repair measures, and minimize the power outage time.
In summary, the small current grounding line selection device significantly improves the detection capability and response speed of single-phase grounding faults by adopting a highly reliable industrial-grade "fully embedded" structure, a comprehensive line selection algorithm combining steady-state and transient quantities, and information fusion technology based on fuzzy theory. This not only helps to quickly locate the source of the fault and reduce the scope of unnecessary power outages, but also effectively avoids the risk of secondary accidents caused by long-term unprocessed problems. It is of great significance to ensure the safe and stable operation of the power system.
