Differential current time different correction method and device and differential protection method and device
A differential current and differential protection technology, which is applied to emergency protection circuit devices, electrical components, etc., can solve the problems of poor reliability of differential protection operations and achieve the effect of improving reliability
Active Publication Date: 2017-11-17
XUJI GRP +4
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[0011] The object of the present invention is to provide a differential current time difference correction method and device, and a differential protection method and device, which are used to solve the problem of poor operational reliability of differential protection
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[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0055] In the following, the applicability of the data synchronization scheme based on the fault wave head in the distribution network is analyzed first.
[0056] Under normal circumstances, the length of the line in the main network is generally more than 100km. When a fault occurs at the midpoint of the line, the fault wave head will reach both ends of the line at the same time. But when the fault point shifts to a certain end, there will be a certain difference in the time for the fault wave head to reach both ends of the line. Especially for faults that occur at the beginning or end of the line, the arrival time at both ends of the line may differ by several milliseconds. In engineering applications, this feature is generally used for...
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The invention relates to a differential current time different correction method and device and a differential protection method and device. The correction method comprises the steps of acquiring a moment of a wave head of a fault wave detected by a detection device at each end of a circuit if a protected starting criterion is triggered; calculating a differential current vector corresponding to the moment of the wave head of the fault wave detected by the detection device at each end of the circuit; calculating correction quantity of the moment of the wave head of the fault wave detected by the detection device at each end according to the length of the circuit at each end; and performing correction according to a phase angle of the differential current vector corresponding to the correction quantity of the moment of the wave head of the fault wave detected by the detection device at each end. The correction quantity of the moment of the wave head of the fault wave detected by the detection device at each end is calculated according to the length of the circuit of each end, the differential current vector corresponding to the moment of the wave head of the fault wave detected by the detection device of each end is corrected according to the correction quantity, the influence of the fault wave on data synchronization during time different transmission in the circuit is fully considered, and the reliability of differential protection action is effectively improved.
Description
technical field [0001] The invention relates to a differential current time difference correction method and device, and a differential protection method and device, belonging to the technical field of electric power system relay protection. Background technique [0002] Considering that the topological complexity of the distribution network far exceeds that of the main network, its requirements for data synchronization are higher than those of the double-ended differential protection. As long as there is a time-scale error of any synchronized phasor that exceeds the tolerance of the algorithm, it will lead to The blocking of protection or even misoperation. Although the protection intelligence center architecture has built a high-speed communication network that supports multi-point synchronization, considering the massive amount of information that needs to be processed within its jurisdiction, it is a very big task to ensure that all phasors that are compared can meet the...
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IPC IPC(8): H02H7/26
CPCH02H7/263
Inventor 郑灏王庆平薄志谦马凯琪王林魏繁荣
Owner XUJI GRP