Power supply harmonic treatment device for traction substation of electrified railway

Abstract

The invention discloses a power supply harmonic treatment device for a traction substation of an electrified railway. The device comprises a bipolar circuit breaker, a current transformer, a lightningarrester, a first capacitor, a second capacitor, a first electric reactor, a second electric reactor, a first resistor and a second resistor which are connected in sequence. The first capacitor, thesecond capacitor, the first reactor, the second reactor, the first resistor and the second resistor form a second-order passive filter. In this way, higher harmonics received by the contact network orthe positive feeder from the electric locomotive can be filtered by the second-order passive filter and do not enter the transformer in the substation any more, so that adverse permeation to a low-voltage power distribution system in the substation is avoided, and damage to low-voltage electric equipment in the substation is avoided.

Description

technical field [0001] The present application relates to the technical field of railways, more specifically, to a power supply harmonic control device used in traction substations of electrified railways. Background technique [0002] There are usually two ways for the power supply used in the traction substation: one is to use the 27.5kV traction power supply in the substation as the power supply, and use the 27.5kV / 0.4kV / 0.22kV transformer for the low-voltage power distribution system in the substation; the other is to use 10kV The power supply is used as the power supply, which is used by the low-voltage power distribution system in the institute after passing through a 10kV / 0.4kV transformer. The telecontrol equipment, relay protection equipment, AC and DC equipment, monitoring equipment and domestic power supply in the traction substation all come from the power supply used, and the quality of its power directly determines the operation stability of the low-voltage equ...

AI Technical Summary

Problems solved by technology

On the one hand, high-order harmonics infiltrate into the upper-level power system through the traction transformer in the institute, and on the other hand, penetrate into the low-voltage power distribution system in the institute through the 27.5kV transformer in the institute. The voltage waveform of the traction substation is severely distorted, causing damage to the low-voltage electrical equipment in the substation, which in turn affects the safe operation of the traction substation

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