Abstract
The recorded operational data shows that the DDL feeder protection malfunction is mostly caused by the unknown resonance in metro traction electric lines. To effectively solve the engineering problem restricting the operation safety of traction power supply, this paper proposes a new feeder protection algorithm based the feeder current waveform characteristics and the screening principle. The first step of algorithm is removing the working current from the great current by the traditional DDL protection algorithm, and the second step is eliminating the influence of the system resonant current. It is proved by lots of actual cases that the new combined algorithm not only has advantages of clear concept and simple pattern, but also can efficiently identify the short-circuit fault of the traction electric lines.
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