Dan Hua Haobo KA2003-DW offline overhead line fault location

The vast majority of 6 ~ 66kV distribution network have adopted a neutral non-effectively grounded approach, also known as the small current grounding system. The advantage is that single-phase ground fault, the fault line without disconnecting immediately, trouble-free operation allowed one to two hours. The disadvantage is that can not be confirmed at the time of the occurrence of the problem of single-phase ground fault on a line which can not quickly find the point of failure. Because of this failure is caused by the phase voltage increased insulation performance of the system pose a great threat, must quickly detect and eliminate the fault line. So small current grounding grid there are two problems to be solved, namely when the grounding occurred, you need to select the fault line; the second is to quickly find the point of failure to deal with the fault. The traditional way is to pull way successive elected fault line, and then the artificial transmission line ground visually determine the exact location. Pull road line selection of non-fault line caused users unnecessary power interruption. Visual transmission line location to spend a lot of manpower and resources. Both of these methods is highly automated and very suited to the modern grid. Through years of efforts by many experts and scholars, the current line selection problem has made a major breakthrough, practice shows that the accuracy of the new line selection line selection device not less than 95%, to meet the operational requirements of the distribution network. Compared with line selection problem, fault location problem of small current grounding system has still not been solved, there still needs to visually determine the point of failure by artificial transmission line. At present, China transmission line fault location technology has made significant progress, positioning works well, but the distribution line fault location technology can not meet the site requirements. The reason is that there is structure and transmission lines and distribution lines compared to a big difference, especially 6 ~ 66kV distribution lines, numerous branches, there is often a multi-level branches, and installed a large number of distribution transformers on the line, leading to widely used in transmission lines The impedance method, traveling wave method positioning technology is difficult to apply in the distribution lines. To this end, the company in collaboration with North China Electric Power University, developed a new type of KA2003-DW-LX / Ⅰ type distribution network fault location device offline. Device using AC and DC's first international positioning method, simple operation, accurate positioning, the product has obtained patents for inventions. For more information visit: http: //www.dhhb.com http://www.dhhb.com/dw/