Micro-grid as a highly efficient and environmentally friendly power generation technology, as the grid operation will affect the distribution network structure and distribution network short-circuit current size and distribution, so the relay protection with the traditional grid is different. After grid interconnection of microgrid, it will affect the original power grid in several ways: Reduce the sensitivity of the line protection; Where the adjacent line is faulty, it may cause misoperation of line protection; Impact on reclosure; Impact on the scope of protection . The unique operational characteristics of microgrids determine that their protection technologies are different from those of the traditional power system protection technologies. As microgrids are in the stage of demonstration projects in our country, domestic research and development on their relay protection products are underdeveloped or lagging behind The research and development of the protection products for the operation of microgrids are the key to the application of microgrid from demonstration to practice in China. In the microgrid protection product development there are two main points: (1) current speed and current limit of the product The research and development of products can inherit the R & D ideas of the traditional current-breaking and the current-limiting breaking current products. R & D can combine the intelligent elements of the microgrid, such as collecting some parameters of protection points or lines to facilitate the development of the microgrid in the later period Interaction or integration of information. (2) the direction of current protection and direction of power protection The connotation of the microgrid is to realize the bi-directional flow of energy flow, and the selectivity and reliability of the protection that appears when the microgrid is connected to the large power grid can not be met. Therefore, the directional current protection and the directional power protection are very Necessary and effective. Due to the large environmental impact of the microgrid, the importance of protection frequency and protection is obviously higher than that of the traditional protection. Sensitivity, directionality and reliability all need to be improved.
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Packaging
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Sample
Time : 7~10 days
Lead Time
:60 days after have the deposit
Payment:
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term: 30% deposit before production and 70 % balance against the copy B/L
OEM product available .
Sample available.
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