| Abstract: |
| The main purpose of power swing blocking is to distinguish faults from power swings. However, the
faults occur during a power swing should be detected and cleared promptly. This paper proposes an
adaptive concentric power swing blocker (PSB) to overcome incapability of traditional concentric PSB in
detecting symmetrical fault during power swing. Based on proposed method, two pairs of concentric
characteristics are anticipated which the first one is placed in a stationary position (outer of zone3) but
the position of the second pair is adjustable. In order to find the position of the second pair of
characteristic, Static Phasor Estimation Error (SPEE) of current signal is utilized in this paper. The proposed
method detects the abrupt change in SPEE and puts the second pair of characteristic in location of
impedance trajectory correspondingly. Second concentric characteristic records travelling time of
impedance trajectory between outer and inner zones and compares to threshold value to detect
symmetrical fault during power swing. If recorded time is lower than threshold, three-phase fault is
detected during power swing. Intensive studies have been performed and the merit of the method is
demonstrated by some test signals simulations. |
| Key words: Concentric PSB, Phasor estimation error, Power swing, Symmetrical fault during power swing |
| DOI：10.1186/s41601-016-0026-9 |
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| Fund: |
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