A single-phase-to-ground fault section location method in distribution network
A single-phase ground fault and section positioning technology, which is applied in the field of electric power system, can solve the problem of high precision and achieve the effect of low CPU requirement, small calculation amount and simple calculation method
Active Publication Date: 2022-05-10
HUANGGANG POWER SUPPLY COMPANY HUBEI ELECTRIC POWER
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[0004] In order to overcome the deficiencies in the existing methods for locating single-phase ground fault sections in distribution networks, the purpose of the present invention is to provide a method for locating single-phase ground fault sections in distribution networks. Locate the fault section with high accuracy
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[0030] like figure 2 The simulation model diagram of a 110kV / 10.5kV distribution network system is shown, S is a 110kV power supply, and the 10kV busbar has four 10kV feeder lines, each with a certain load. Line 1 is a mixture of cable lines and overhead lines, line 2 is an overhead line, line 3 is an overhead line, and line 4 is a cable line. The fault point is set on line 1. Line 1 contains branch lines and contains 4 sections in total, numbered 1, 2, 3, and 4 at the beginning of the section. Among them, section 1 indicates that the fault is located between 1 and 2, which is a cable line with a total length of 1.6km; section 2 indicates that the fault is located between 2 and 3 and is an overhead line with a total length of 1.2km; section 3 indicates that the fault is located after 3 , is an overhead line with a total length of 3km, and section 4 indicates that the section is located on branch line 4, which is an overhead line with a total length of 2km. Line current tran...
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The invention discloses a method for locating a single-phase ground fault section of a distribution network. Firstly, the line fault section table is compiled according to the line section; secondly, the instantaneous value of the three-phase current at the head end of each section of the distribution network fault line is collected synchronously in real time, and the zero current flowing through the head end of each section is calculated according to the collected instantaneous value of the three-phase current. sequence current; then, the zero-sequence current at the head end of each section is respectively made a difference, and the absolute value is taken to find the maximum value of the absolute value of each difference in the fault transient process, and sorted from small to large; finally, compare the fault section corresponding Table, determine the faulty section according to the value from small to large, until the faulty section is the only section, that is, it is judged that the section is faulty. The method of the invention is almost not affected by the fault location and fault time, and can quickly realize the location of the single-phase ground fault section of the distribution network.
Description
technical field [0001] The invention belongs to the field of power systems, and relates to a distribution network fault section positioning technology, in particular to a distribution network single-phase ground fault section positioning method. Background technique [0002] In the distribution network system, when a single-phase ground fault occurs, the neutral point voltage rises from zero to the phase voltage, and the line voltage between the three phases remains symmetrical, which does not affect the normal power supply, so the system is generally allowed to continue to run for 1 to 2 hours . However, the non-fault phase-to-ground voltage rises after the fault times, in order to prevent the further expansion of the fault and cause two or more points to ground short circuit, after the fault line is selected, the fault should be found in time and measures should be taken to deal with it. After the distribution network line, especially the cable line, is faulty, it is di...
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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 胡秀明何旭东徐丹李园张沂吴燕李梅安玉琼赵淑萍陈晓锋周钰展
Owner HUANGGANG POWER SUPPLY COMPANY HUBEI ELECTRIC POWER