Railway electric power system who restraines harmonic

The utility model discloses a railway electric power system who restraines harmonic belongs to railway electric power tech field, including higher level's power, distribution substation power cabinet, link to each other with distribution substation power cabinet link up the line, be provided with harmonic suppression device between higher level's power and the distribution substation, harmonic suppression device includes reactor L, resistor R, circuit breaker QF, isolator QS1, isolator QS2 and isolator QS3, wherein reactor L is parallelly connected with resistor R, higher level's power links to each other with circuit breaker QF, and circuit breaker QF links to each other with reactor L and the parallelly connected one end tie point of resistor R, and reactor L links to each other with lower interface B end with the parallelly connected other end tie point of resistor R, and harmonic suppression device's lower interface B end links to each other with distribution substation power cabinet. The utility model discloses the damage that the power equipment of distribution substation caused in to railway electric power system of the harmonic of having avoided higher level's power is guaranteed in the various methods of operation of distribution substation, when lining up the various situation of line, but the equal steady operation of electric power system.