Research on Error Characteristic of the Protective Current Transformer in High Remanence Environment

Abstract:

Electromagnetic Current Transformer (CT) is one of the main equipment in power system, and the remanence in the measuring or protective windings of CT will influence the stability of the power system. Measuring CT is mainly used for the electric energy measurement in normal working condition, focusing on the steady operation state; while protective CT is usually used in fault or short-circuit condition, and the transient transfer characteristic is of significant important. Considering high remanence operation environment in the power system, the numeric analytical model of CT, which is working in the saturation condition, is depicted in this paper. With analyzing the amount of exciting current caused by remanence and deducing the transfer characteristic of CT, the influence of the remanence on the relay protection and the corresponding precautions are proposed, providing accurate and reliable theoretical basis for the protective CT’s correct action and safety operation after system failure. Finally, the electromagnetic transient model of protective CT (TPY) is built in PSCAD, the simulation result of which shows the validity and practicability of the proposed model.

• Periodical: Advanced Materials Research (Volumes 1070-1072)
• Pages: 1092-1104
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1070-1072.1092
• Online since: December 2014
• Authors: Wei Wei*, Wei Zhen, Ming Zhong Liu, Xiao Bin Liang, Cang Yang Chen
• Keywords: CT, Relay Protection, Remanence, Saturation

References

[1] Yuan Ji-Xiu, Sheng He-Le, and Wu Ju-Ye, The application guide book of protective current transformer, Beijing, China Electric Power Press, (2004).

[2] D.A. Tziouvaras，Peter Mclaren, Mathematical Models for Current, voltage, and coupling Capacitor voltage transformers, IEEE Trans on Power Delivery, vol. 15, No. 1, PP. 62-72, Jan. 2000.

DOI: 10.1109/61.847230

[3] Shu Hong-Chun, Lin Min, Compared research on the transient numetic modelling and simulation of current transformer, Power System Technique, 2003, 27(4)：11—14.

[4] J.K. Lucas, EGMclaren, W.W.L. Keerthipala and ILEJayasinghe, Improved simulation models for current and voltage transformers in relay studies, IEEE Tram on Power Delivery, v01. 7，no. 1，PP. 152-159, Jan. (1992).

DOI: 10.1109/61.108902

[5] ILP. Jayasinghe，EGMclaren, Transformer core models based on the Jiles·Athertonalgorithm, 1997 Conference on Communications, Power and Computing Proceedings. pp.121-125, May (1997).

[6] U.D. Annakkage, EGMclaten,E. Dirks, ILP. Jayasinghe, and A.D. Parker, A cmTent Wansformer model based on the Jiles-Atherton theory of ferromagnetic hysteresis, IEEE Trans on PowerDelivery, v01. 15, no. 1, PP. 57-61, Jan. (2000).

DOI: 10.1109/61.847229

[7] J.R. Marti, LR. Linares, and H.W. Dommel, Current transformers and coupling-capacitor voltage transformers in real-time simulations, IEEE Trans on Power Delivery, v01. 12, no. 1, pp.164-168, Jan. (1997).

DOI: 10.1109/61.568236

[8] M. Poljak, N. Kolibas, Computation of cun-ent U'ansformer transient performance, IEEE Trans on PowerDelivery, v01. 3, no 4, pp.1816-1822, Oct. (1988).

DOI: 10.1109/61.193988

[9] Sun Ming-Jie, Xu Zheng, Study on the magnetization transient simulation of two types of current transformer, Journal of Zhejiang University of technology, 2007, 24(2): 190—194.

[10] D.A. Tziouvaras, Peter Mclaren, Mathematical Models for Current, voltage，and coupling Capacitor voltage transfon'ners, IEEE Trans On Power Delivery, v01. 15, no. 1, p.62—72, Jan. (2000).

DOI: 10.1109/61.847230

[11] GBl6847—1997, Transient characteristic technique requirements of the protective current transformer.

[12] GBl208. 1997, Current transformer.

[13] He Jia-Li, Song Cong-Ju, Power System Relay Protection, Beijing, China Electric Power Press, (2000).