Analysis method and system for grounding distance protection by access of superconducting current limiter
A superconducting current limiter and distance protection technology, which is applied in the usage of superconductor elements, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve the problem of rapid increase of current limiting impedance, problems such as increase
Pending Publication Date: 2021-12-21
STATE GRID TIANJIN ELECTRIC POWER +1
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Due to the sharp increase of magnetic permeability, the current-limiting impedance of the superconducting current limiter increases rapidly to limit the short-circuit current
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[0044] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0045] see Figure 1-Figure 6 , an analysis method for superconducting current limiter access to grounding distance protection,
[0046] The invention analyzes in detail the simulation research and the setting cooperation principle of the grounding distance protection of the transmission line by the superconducting current limiter, and proposes corresponding control measures. The following analysis is all for the situation that the distance protection protection range includes a superconducting current limiter, that is, the distance protection voltage transformer at the local end of the line is PTI-1, PTII-1, such as figure 1 shown.
[0047] Based on the analysis of the background part, simulation verification is carried out, and this appli...
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The invention relates to a method and a system for analyzing grounding distance protection by access of a superconducting current limiter, and belongs to the technical field of power grid safety. The method is characterized by at least comprising the following steps of: S1, judging whether a single-phase grounding fault occurs in a line, and if so, executing S2; or otherwise, judging whether the fault is a two-phase or three-phase short-circuit grounding fault, and executing a corresponding protection strategy. According to the technical scheme, detailed analysis is carried out on the simulation research and setting cooperation principle of the superconducting current limiter on the grounding distance protection of the power transmission line, and response control measures are put forward. According to the simulation research and setting cooperation principle of the superconducting current limiter on the grounding distance protection of the power transmission line, detailed analysis is carried out, and corresponding control measures are put forward.
Description
technical field [0001] The invention belongs to the technical field of power grid safety, and in particular relates to an analysis method and a system for protecting the grounding distance of a superconducting current limiter. Background technique [0002] With the continuous expansion of power grid scale, the problem of excessive short-circuit current has become one of the prominent factors restricting the growth of power grid load and the development of power grid. In recent years, with the rapid development of the installed capacity of the power grid and the construction of grids of various voltage levels, the grid structure has been greatly strengthened, and a double-circuit inner and outer ring network structure has basically been formed in many areas. The power grid meets the needs of grid load growth and reliable power supply, but at the same time it also makes the short-circuit capacity of the grid continue to increase. Although the power grid has taken measures suc...
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IPC IPC(8): H02H9/02H02H1/00
CPCH02H9/023H02H1/0007Y02E40/60
Inventor 郭丰瑞曹旌梁刚孙志国郭铁峰范占强刘琛杨要中庞博夏志兵田圳王振法赵玲玲赵婧刁红凤吕绍杰史宝廷符泽达刘书辉孔亚鸣胡勤宇李飞王鑫么玄玥郭宇程张佳琪华欣宇
Owner STATE GRID TIANJIN ELECTRIC POWER