適于ZSI技術(shù)可實(shí)現(xiàn)短路保護(hù)的小型斷路器的研究
[Abstract]:With the development and construction of smart grid, the selectivity and rapidity of distribution system protection have been paid more and more attention, and the traditional current setting and time setting have their inevitable disadvantages. Regioselective interlocking (ZSI) technology can combine the advantages of current setting and time setting, and at the same time take into account the selectivity and rapidity, but ZSI technology requires all circuit breakers to have a certain intelligent function. Except for the bottom circuit breaker, the circuit breaker at other levels of the distribution system must have three-stage protection function. Because the small circuit breaker of distribution terminal does not have short circuit delay function, the application of ZSI technology in distribution terminal system is limited. According to the working principle of AC electromagnet short circuit ring, a new theory is proposed to realize the short circuit delay function of small circuit breaker. By using the demagnetization effect of the double winding coil, the change of the main flux in the electromagnet can be controlled by controlling the turn on and off of the coil when the magnetic potential is constant, and then the electromagnetic suction can be changed and the working state of the circuit breaker can be controlled. To achieve the purpose of short delay. First of all, according to the structure and motion characteristics of small circuit breakers and the working principle of regioselective interlocking technology, the overall scheme of short circuit protection of dual winding controllable electromagnetic release device should be put forward. Then, the main factors affecting the minimum trip current of the double winding controllable electromagnetic release under two working conditions are analyzed and deduced by means of the Maxwell equation theory. The mathematical model of the controllable electromagnetic release of double windings is established by matlab software, and the main factors affecting the minimum trip current of the controllable electromagnetic release of double windings under different working conditions are further analyzed by magnetic circuit simulation. The consistency between the simulation results and the theoretical analysis verifies the feasibility of the application of double winding theory in small circuit breakers. Secondly, taking the small circuit breaker DZ47-60 as a reference, the structure size of the double winding controllable electromagnetic release is designed by selecting the suitable working air gap, spring reaction force and the electromagnetic suction of the key points, and the corresponding parameters are calculated. Finally, the 3D magnetic field modeling and simulation of the double winding controllable electromagnetic release of the small circuit breaker are carried out by ansoft software. Through the simulation results, the structure of the controllable electromagnetic release device with double windings is improved. The dual winding controllable electromagnetic release realizes the short circuit delay protection of small circuit breakers, which not only lays the foundation for the use of regioselective interlocking technology in distribution terminals, but also provides the possibility for full selective protection of distribution systems.
【學(xué)位授予單位】:沈陽工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM561
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