A multi-terminal line differential protection method and system
A line differential and protection system technology, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, circuit devices, etc., can solve the problems of differential protection and multi-terminal lines that cannot realize full-line quick action, and achieve avoidance of system Effects of deactivation, elimination of dependence on timing systems, and prevention of communication interruptions
Active Publication Date: 2019-09-10
XJ ELECTRIC +1
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[0003] The purpose of the present invention is to provide a multi-terminal line differential protection method and system, which is used to solve the problem that the current multi-terminal line cannot realize the differential protection of the full line speed
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[0032] The specific implementation manners of the present invention will be further described below in conjunction with the drawings and specific embodiments.
[0033] Such as figure 1 As shown, this example is a seven-terminal line differential protection system. A set of protection sub-units is installed at each line terminal, and a protection host is installed in a substation. The protection host can be set separately or centralized. The mode of a protection sub-machine, the protection host communicates with all protection sub-machines.
[0034] Specifically, each protection sub-machine is connected to the protection host through a dedicated optical fiber channel, without using multiplexed channels, which avoids the uncertainty of transmission delay caused by SDH and other transmission paths. Each protection sub-machine sends sampling information to the protection host in a point-to-point manner with optical fiber Ethernet, and the information transmission follows the IEC6...
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The present invention relates to a multi-terminal line differential protection method and system. The differential protection method includes the following steps that: the protection sub-machines of a plurality of terminal lines acquire the electric quantity data of the corresponding terminal lines and send the electrical quantity data to a protection main machine; the protection main machine receives the electrical quantity data sent by the protection sub-machines, performs differential protection calculation, and sends tripping commands to the protection sub-machines if an in-area fault occurs; and the protection sub-machines control circuit breakers at the corresponding terminal lines to trip according to the tripping commands so as to remove the fault. According to the multi-terminal line differential protection method and system of the invention, one protection sub-machine is arranged at the terminal of each terminal line, and the protection main machine is arranged at a certain terminal line, the protection sub-machines acquire the electrical quantity data at the corresponding terminals and sends the electrical quantity data to the protection main machine; the protection main machine acquires the data sent by the protection sub-machines, performs differential current calculation to judge whether a fault is an out-area fault or an in-area fault, and sends the tripping commands to the protection sub-machines if the in-area fault occurs; and the protection sub-machines trip the circuit breakers at the corresponding terminal lines through the tripping loops of the protection sub-machines according to the tripping commands, and therefore, the isolation of the fault is completed.
Description
technical field [0001] The invention relates to a multi-terminal line differential protection method and system, and belongs to the technical field of relay protection of intelligent substations. Background technique [0002] Most of the traditional medium and high voltage transmission lines adopt the point-to-point transmission mode, and the transmission lines are directly connected between two substations or between power plants and substations. With the rapid development of my country's economy, the demand for electricity is gradually increasing, and it is necessary to build new substations to meet the power supply. Out of economical considerations, three-terminal transmission lines or T-connection transmission lines appeared. T-connection transmission lines can be configured with three-terminal differential protection, but three-terminal differential protection requires the cooperation of the master and slave ends, and the pressure plate switching strategy is complicated...
Claims
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IPC IPC(8): H02H7/26H02H3/32
Inventor 陈先勇王雨峰易永辉李保恩韩湘李瑞明樊平姬喜军丁建生王刚徐双凯李卫国朱重阳宋德印赵奇张瑞芬吕利旭杨杰史厚祥明廷谦侯良增邱绍申何永亮赵建峰王占磊刘金恒
Owner XJ ELECTRIC