Traveling wave impedance protection method and system
A traveling wave impedance and protection device technology, used in emergency protection circuit devices, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of phase selection failure, loss, and protection three-hop misalignment, and achieve reliable phase selection. Effect
Pending Publication Date: 2022-04-26
BEIJING SIFANG JIBAO ENG TECH +1
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[0003] When the zero-sequence current differential protection meets its operating conditions, it is not possible to directly confirm which phase is faulty, and phase selection is required. However, under heavy load and a ground fault through a large transition resistance, the zero-sequence current differential protection may be selected. Phase failure, in the single-phase reclosing mode, if the three trips of the protection do not overlap when the single-phase fault occurs, it will cause losses
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[0115] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.
[0116] figure 1 Schematic diagram of configuring traveling wave impedance protection for both sides of the line. In the figure, the traveling wave impedance protection device collects the PT (potential transformer, voltage transformer) three-phase AC voltage and CT (current transformer, current transformer) three-phase AC current at the installation site in real time, and trips circuit breaker B when the protection operates. The traveling wave impedance protection on both sides of the line is connected through the fiber channel, and the sampling data is synchronized, and the three-phase voltage and three-phase current sampling data are sent and received in real time. The positive direction of the...
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The invention provides a traveling wave impedance protection method and system. The method comprises the following steps that 1, traveling wave impedance protection devices on the two sides collect the three-phase alternating voltage and the three-phase alternating current at the protection installation position in real time; step 2, obtaining zero-mode components and line-mode components of voltages and currents on two sides through Karenberg phase-mode transformation; 3, calculating a reverse current traveling wave and a reverse voltage traveling wave of a zero mode and a line mode at two sides; step 4, calculating each phase of reverse voltage and current traveling wave for traveling wave impedance through Karrenbel transform; 5, respectively calculating traveling wave impedances of the A phase, the B phase and the C phase; and step 6, performing protection action after the traveling wave impedances of the A phase, the B phase and the C phase meet the action equation. The traveling wave impedance protection provided by the invention can quickly act within 10ms, is slightly influenced by the magnitude of fault current and the transition resistance of a fault point, and has clear selectivity for internal faults and external faults.
Description
technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a method and system for traveling wave impedance protection. Background technique [0002] The current differential protection based on Kirchhoff's current law has been widely used as the main protection of transmission lines, which basically meets the field application. The longitudinal current differential protection includes phase-separated current differential protection and zero-sequence current differential protection. When a large transition resistance fault occurs, it mainly operates through zero-sequence current differential protection. The action speed of the current split-phase current differential protection is affected by the size of the fault current, and the zero-sequence current differential protection usually needs to be delayed for 60ms to 100ms before it can act. For a fault with a large transition resistance, the fault removal time includes ...
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IPC IPC(8): H02H7/26G01R31/08G01R27/02
CPCH02H7/265G01R31/085G01R27/02
Inventor 熊军杨卉卉赵志宏蔡新伟张月品伍叶凯杜兆强徐可寒穆凌雁
Owner BEIJING SIFANG JIBAO ENG TECH