Method for measuring parallel grid line zero-sequence capacitance

Abstract

The invention relates to a method for measuring parallel grid line zero-sequence capacitance. The zero-sequence capacitance is measured through a single-phase power, a distributed power generator and a mutual inductance measuring device, one end of the mutual inductance measuring device is connected with three-phase guide lines through three connecting branch lines, and the other end of the mutual inductance measuring device is connected to the ground; the single-phase power is connected at one connecting point of the three connecting branch lines through a line, and the distributed power generator is connected to a line connected to the grounding end of the mutual inductance measuring device through a line and is connected with the single-phase power. Compared with the prior art, the method is convenient to use and easy to measure, by means of test, the adjacent parallel lines are on different grounding conditions, measuring results of the zero-sequence capacitance are consistent, so that the measuring results are accurate.

Description

technical field [0001] The invention relates to a capacitance measurement method, in particular to a method for measuring the zero-sequence capacitance of parallel grid lines. Background technique [0002] With the large-scale application of double (multiple) circuit lines on the same tower in my country's power grid, and the merger of large-scale line corridors, there are more and more transmission lines running in parallel on the same tower or in the same transmission channel. Although the corridors of the UHV transmission lines and the planned lines of power grids at all levels have not yet been fully determined, according to the currently determined part of the line routes, it is inevitable that the UHV AC and DC lines will use the same transmission corridor as the existing 500kV grid lines, and the parallel construction of lines will become a trend. Especially in economically developed areas, AC and DC transmission lines are becoming more and more dense, and land resou...

AI Technical Summary

Problems solved by technology

As the situation of power lines being erected on the same tower and crossing them becomes more and more serious, the induced voltage between transmission lines increases, which poses a serious threat to the safety of testers and instruments, and brings great pressure to the accurate measurement of line power frequency parameters. serious disturbance

In the actual work of line parameter testing, it is found that the interference voltage between transmission lines is as high as thousands of volts, and the interference voltage between the three-phase conductors of the same line is also very different.

Images