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Analysis of the application of grounding detection engineering in current grounding system

2013-09-19
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Analysis of the application of grounding detection engineering in current grounding system In 6-66 kV power systems, a small current grounding system is generally used in which the neutral point is not grounded or grounded through an arc suppression coil. When a single-phase grounding fault occurs in the system, the grounding fault current is often very small because it cannot form a short-circuit loop. The symmetry of the system line voltage is not destroyed, and the system can continue to operate for a period of time. The regulations generally stipulate that it is 1-2 hours. In order to prevent the expansion of system accidents, the grounding point must be eliminated during this period of grounding operation. Since the advent of the small current grounding line selection device in the 1980s, it has undergone several technological upgrades, and its line selection accuracy has been continuously improved. Although the manufacturer claims that the line selection accuracy is 100%, there is a high misjudgment rate in actual engineering, which makes many users feel that it is troublesome to use it. Therefore, in many cases on site, the selection and inspection equipment is idle and the original method of manual switch test is used to find the grounding. 1 Analysis of the characteristics of single-phase grounding in small current systems Operation status of single-phase grounding in small current systems

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