Dissertation > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices

Earth Fault Location in Non-solidly Earthed Network for Distribution Network

Author LiuShiGuang
Tutor HanXiaoPing
School Shandong University
Course Electrical Engineering
Keywords Neutral non- effectively grounded system Single - phase ground fault Fault location Wireless communication
Type Master's thesis
Year 2010
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With the continuous development of the national economy, increasing the reliability of power supply requirements, the need to keep the power system reform and improvement of the traditional power grid urgent need to further improve the smart grid has become the development trend of the future grid. Play a crucial role in the development of the smart grid self-healing, and rapid healing. Due to the unique operating characteristics of the small current grounding system, our distribution network to use more non-effective grounding of the neutral point operation mode (ungrounded arc suppression coil grounding), run small current grounding, which can effectively improve the self- The more capacity. In the distribution network, accounted for 80% of the total failure of single-phase ground fault, how quickly and efficiently the fault location of a power system research focus. The proposed fault location method can get some applications in the field, but its signal is weak or the limit of detection methods, their site is not very high success rate, still need further study. Fast and reliable positioning for single-phase ground fault integrated the existing fault location on the site a more practical fault location method to achieve fast, reliable positioning of the failure to ensure the reliability of power supply, they can reduce the economic losses caused due to a fault. This paper describes the basic principle of the distribution network single phase to ground fault location and fault detection device hardware and software design. The system combines the small current grounding fault line selection as well as the positioning of the ideas, the spirit of the principle of first line selection positioning to achieve small ground fault current fault location. First, determine the fault line, then the fault line of data via GPRS wireless communication network fault information reported to the automatic positioning master master fault location algorithm to determine the section of the fault where. The method can rapidly detect the point of failure in order to achieve fast and accurate distribution network line fault isolation, to ensure their safety, and reduce economic losses. Compared with the traditional method of fault location, the method combines the single-phase ground fault location method, and take the steady-state and transient information and a way to carry out the fault location positioning method based on steady-state information can not only effectively take advantage of simple, reliable highly repeatable positioning advantages, and the same applies to the arc suppression coil grounding system has better practicality. Fault (only the fault line) and the use of GPRS automatically reported to reduce the amount of data transferred, reducing the time of the failure, saving manpower and resources, the promotional value. Therefore, the use of the method of fault location method not only highly practical, more extensive market prospect.

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