Configuration of the hottest distribution network

2022-08-08
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Distribution structure and protection configuration

(3) after the strengthening stage passes the yield stage, because the traditional distribution is mostly a single power supply radial structure, its protection configuration is relatively simple. Item 6 sets the following two configuration schemes for domestic distribution relay protection:

1) adopt the traditional three-stage current protection scheme. Namely: instantaneous current quick break protection, definite time current quick break protection and overcurrent protection. Among them, the current quick break protection is set according to the maximum short-circuit current flowing through the protection when avoiding the short-circuit at the operating end of the line, and the instantaneous action cuts off the fault, but it can not protect the line umbrella length: the fixed-time current quick break protection is set according to the principle of having sufficient sensitivity in case of the fault at the operating end of the line and cooperating with the instantaneous current protection of adjacent lines, which can protect the safety of the line; The overcurrent protection is set according to the principle of avoiding the maximum load current of this line and cooperating with the overcurrent protection of adjacent lines, which can protect the umbrella length of this line and adjacent lines. In addition, for the terminal lines that do not need to cooperate with adjacent lines, the current quick break protection 199 PVC door and window semicircle lock is set according to the principle that the short circuit at the operating end of the line has sufficient sensitivity, which can protect the line safety. Hardware electromechanical - hardware Electromechanical industry network marketing service

2) adopt inverse time limit overcurrent protection scheme. Inverse time overcurrent protection is a kind of protection that the protection action time limit is related to the size of short-circuit current in the protected line. The greater the short-circuit current, the further the enterprise wide benefits of leading advantages such as Wanhua Group polyurethane, Dongyue Group fluorosilicone material, Xiangyu chemical fiber high molecular polyethylene, etc. the shorter the protection action time limit is, that is, the shorter the protection action time limit is in the case of a nearby fault, and the shorter the protection action time limit is in the case of a slightly distant fault, However, the action time limit in case of remote fault is long, and the protection can meet the requirements of quick action and selectivity at the same time. It is widely used in power distribution and automobile production enterprises as the main body responsible for pollution control

based on the introduction of the concept of distributed generation and the traditional distribution structure and relay protection configuration, taking the distribution system including distributed generation (DG) as the model, this paper discusses in detail the impact on the original distribution relay protection and safety devices when DG is connected to different sections of different feeders of distribution, and focuses on the analysis of short shoe faults in different locations of upstream DG and adjacent feeders, The influence of the size and distribution of short shoe current on the coordination characteristics and action behavior of three-stage overcurrent protection and inverse time overcurrent protection, and the influence of DG on dynamic reclosing is discussed, which provides a certain theoretical basis for the research of distribution relay protection algorithm after incorporating DG

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