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Content Provider | IEEE Xplore Digital Library |
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Author | Hyun-Woong Lee Yong-Cheol Kang Sung-Il Jang Yong-Gyun Kim |
Copyright Year | 2007 |
Description | Author affiliation: Dept. of Electr. Eng., Chonbuk Nat. Univ., Chonju (Hyun-Woong Lee; Yong-Cheol Kang; Sung-Il Jang) |
Abstract | This paper describes a distance relay that operates in conjunction with a current transformer (CT) compensation algorithm, which can be used with a measurement type CT. A distance relay detects a fault based on the ratio of the voltage to the current. If a CT saturates, the calculated impedance becomes larger. This causes maloperation or operating time delay of the distance relay. A compensation algorithm estimates the correct secondary current from the severely distorted currents of the measurement CTs. The compensation algorithm detects the start of saturation and then estimates the core flux at that instant. This value is used to calculate the flux during the fault. The flux is then inserted into the magnetization curve to calculate the magnetizing current corresponding to the flux. The correct current is estimated by adding the calculated magnetizing current to the measured secondary current. Test results show that the proposed distance relay can detect a fault without causing the operating time delay even when the secondary currents are extremely distorted because of use of measurement CTs. |
Starting Page | 1176 |
Ending Page | 1181 |
File Size | 840534 |
Page Count | 6 |
File Format | |
ISBN | 9781424421893 |
DOI | 10.1109/PCT.2007.4538482 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2007-07-01 |
Publisher Place | Switzerland |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Protective relaying Current measurement Current transformers Distortion measurement Fault detection Delay effects Magnetic flux Saturation magnetization Fault currents Circuit faults Distance relay Compensation CT Saturation |
Content Type | Text |
Resource Type | Article |
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