A CT break identifying method based on fault characteristics in current differential protection
Abstract
CT second circuit break will cause the malfunction of current differential protection, so the current differential protection need to be blocked after CT break. Therefore, it is very important to identify the CT break correctly for the performance of current differential protection. This paper proposed a CT break identifying method based on fault characteristics, including two parts, the multi-CT current starting element and the CT break identifying element. Assuming the protection is started by a CT break, if there is any fault characteristic, jump out of the CT break identifying element immediately and determine as a fault. The method can distinguish high resistant grounding fault and CT break accurately, and identify CT break correctly in 20ms. That improves the accuracy and rapidity of CT break identification, furthermore improves the performance of current differential protection.
- Publication:
-
Materials Science and Engineering Conference Series
- Pub Date:
- September 2017
- DOI:
- 10.1088/1757-899X/231/1/012048
- Bibcode:
- 2017MS&E..231a2048Y