A new scheme of protective system for three-phase transformers

C. L. Cheng, Chin-E. Lin

Research output: Contribution to conferencePaperpeer-review

5 Citations (Scopus)

Abstract

Three-phase Transformers are key equipments in power systems and power plants. Security and stability of three-phase transformers are both important and necessary to system operation. When a three-phase transformer is energized, the inrush current due to flux saturation in the core results in a malfunction of the differential relay and also causes a stress impact to the transformer. These have a bad effect on the security and stability of power system. In this paper, an optimum non-synchronous switching-on suppressing method of three-phase transformers inrush current is proposed. The proposed method is examined by experiment. It has excellent performance for suppressing three-phase inrush current. It is applied to design the protective system of a three-phase transformer. For the optimum non-synchronous switching-on suppressing method, a protective system based on a single-chip controller is implemented. The system can distinguish fault current from inrush current. Therefore stress impact and overvoltage resulting from three-phase inrush current can be avoided. The active protection of three-phase transformer is obtained to improve the protective relaying system. Now, problems caused by three-phase inrush current can be detected and solved effectively.

Original languageEnglish
Pages1808-1813
Number of pages6
Publication statusPublished - 2002 Dec 1
EventIEEE/PES Transmission and Distribution Conference and Exhibition 2002 : Asia Pacific - Yokahama, Japan
Duration: 2002 Oct 62002 Oct 10

Other

OtherIEEE/PES Transmission and Distribution Conference and Exhibition 2002 : Asia Pacific
Country/TerritoryJapan
CityYokahama
Period02-10-0602-10-10

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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