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| A Novel Strategy of Current Transformer Saturation Identification and Valid Data Application Based on Wavelet Packet |
| Xing Jiawei1, 2, Jin Neng1, Lin Xiangning1, Liu Yao1, Li Zhen3 |
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China;
2. China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan 430074 China;
3. XJ Electric Corporation Limited Xuchang 461000 China |
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Abstract In order to solve the busbar differential protection maloperation caused by the secondary side current distortion when saturation of current transformer occurs, a novel strategy of the current transformer saturation identification and valid data extraction is proposed in this paper. Current transformers connected to the same busbar within a substation were grouped based on the similarity of sampling information time-frequency characteristics in the first place. Then, an optimized wavelet packet algorithm was used to identify the mutation points of all the secondary currents in the same group. By comparing each mutation point of secondary current within the same group, whether current transformer saturation occurred could be determined, and the valid data segment after fault occurred was extracted for protection calculation. According to the length of different valid data, different protection algorithms were applied to determine the fault types. Simulation results based on PSCAD verify that the proposed method can locate all the mutation points of the secondary current and identify different kinds of current transformer saturation accurately. Furthermore, the proposed method can effectively deal with fast saturation, interference, and transferring fault.
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Received: 12 March 2018
Published: 29 March 2019
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2019, Vol. 34 
