Method for realizing back-up protection in wide area protection by using differential protection
A differential protection and backup protection technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems affecting the transmission capacity of the system, etc., to simplify coordination, reduce workload, and improve speed. sexual effect
Active Publication Date: 2012-07-11
STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY +2
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Problems solved by technology
Relay protection workers of all ages have also worked hard and devoted their whole lives to it. However, due to the inherent limitations of the principle, it is inevitable that there will be various shortcomings. For example, it is necessary to consider the coordination problem, especially if it is necessary to protect the low voltage of the main transformer of the substation in the distance from Section III. side, the time limit should be greater than the main transformer composite voltage blocking overcurrent time limit + 0.3S, so the protection of the distance section III of this line often needs to go through a delay of more than 1", which seriously affects the transmission capacity of the system
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[0019] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.
[0020] figure 1 The topological map of the protected area for simplified Heilongjiang wide-area protection, B 1 , B 2 ,...,B 10 are respectively the installation places of circuit breakers and current transformers in the system, N 1 Bus of Shangzhi Station, N 3 , N 4 are two connecting lines, N 5 , N 6 They are the buses in Binzhou and Yabuli stations respectively. This step starts with B 2 Take this as an example.
[0021] ⑴. According to the topological structure of the protected area, it will be connected with B 2 All CTs directly connected through the bus form a differential combination BA, BA consists of {B 1 , B 2 , B 3}Three CTs, the differential combination is B 2 The corresponding bus main protection is called B 2 Bus...
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The invention relates to a method for realizing back-up protection in wide area protection by using differential protection, which comprises the step of substituting cross-element differential protection for the traditional back-up protection functions of distance, zero sequence, failure, dead zone and the like. With the method, the advantages of the differential protection principle can be effectively utilized, and the quickness, the reliability, the selectivity and the sensitivity of back-up protection are increased. Cooperation among all levels of relay protection can be simplified, and the work load of constant value adjustment is reduced. In the wide area protection system, the protection functions adopt the principle of circuit-breaker configuration in consideration of convenience. When the protected area fails, the motion behavior of each circuit breaker per se is considered one by one, and the failure is eliminated via the correct motion of each circuit breaker.
Description
technical field [0001] The invention belongs to the field of relay protection in power systems, in particular to the principle of wide-area protection. Background technique [0002] Compared with the distance and overcurrent protection using single-terminal electrical quantities, differential protection uses multi-terminal electrical quantities to judge the fault range, is not affected by system oscillation, and has a natural phase selection function. Therefore, the traditional line longitudinal differential protection has become the most widely used line main protection, and some areas even use longitudinal differential protection for both sets of main protection of a line. [0003] Wide-area protection is a protection method that relies on multi-point information of the power system to quickly, reliably and accurately remove faults, analyze the impact of fault removal on the safe and stable operation of the system, and take corresponding control measures. With the gradual...
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IPC IPC(8): H02H7/26H02H3/26
Inventor 周迎秋肖荣国徐丽娟曾兵元
Owner STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY