Reverse starting and line selecting method suitable for high-resistance grounding fault of asymmetric power grid
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ζζ―η¦
- Publication Date
- 2018-07-17
Abstract
Description
technical field
[0001] The invention belongs to the field of single-phase grounding fault processing of distribution networks, and is mainly used for starting processing and grounding line selection of a grounding fault processing device when a neutral point displacement voltage decreases when a high-resistance grounding fault occurs in an asymmetrical power grid. Background technique
[0002] Different single-phase ground fault processing devices have different fault start methods and fault start values, but most of them use the grid neutral point displacement voltage as the fault start value of single-phase ground fault. However, due to the different ground parameters of the power grid, the degree of asymmetry of the power grid is also different, and the displacement voltage of the neutral point of the power grid is also different. The neutral point of the power grid is not grounded, and the asymmetry coefficient The value range is 0-5%. The test found that when a high-r...