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| Description | Electrical Engineering Topics Sunday, May 16, 2021 UNDERSTANDING THE NEGATIVE-SEQUENCE DIRECTIONAL ELEMENT (32Q) Author: BSEE Hugo Reyes Hernández 1. INTR |
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| Electrical Engineering Topics Sunday, May 16, 2021 UNDERSTANDING THE NEGATIVE-SEQUENCE DIRECTIONAL ELEMENT (32Q) Author: BSEE Hugo Reyes Hernández 1. INTRODUCTION Negative-Sequence Directional Elements ( 32Q ) determine the direction of the PHASE-TO-PHASE CURRENTS, PHASE-TO-PHASE-TO-GROUND CURRENTS AND PHASE-TO-GROUND CURRENTS , they are used to supervise overcurrent elements ( 50P/51P and 50N/51N ) and distance elements ( 21 ). With electro-mechanical relays, negative-sequence directional elements were more complicated and costly to implement. In contrast, numerical or digital relays are easy to implement and economically viable, they allow the use of multiple directional elements in a single relay such as: positive-sequence directional elements (32P), negative-sequence directional elements (32Q) and zero-sequence directional elements (32N) . In this article we have been focused in understand how the negative-sequence directional element works. 2. BASIS OF THE NEGATIVE-SEQUENCE |
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