A Fault Judgment Method for T-type Power Supply in Double Track Traction Network

Abstract

The invention applies to the field of design of railway traction power supply and transformation systems, and provides a fault determining method for a T type power supply of an electric traction network of double tracked railways. The method comprises the steps of 1, determining whether a electric traction network fault point appears in the uplink direction or the downlink direction according to the total current I1 and the total current I2 of a feeder A and a feeder B; 2, calculating the current IB of a section post B and the current IC of a section post C on the premise that the short circuit fault is supposed to occur in a point A at the downlink side in an outlet of a traction substation; setting the constant K0 as K0=IB / IC; comparing the ratio IB' / IC' of the current IB' of the section post B to the current IC' of the section post C with the constant K0 in case of fault so as to determine whether the traction network short circuit point appears in the left side or the right side of the traction substation. According to the method, the networking structure of the substation SCADA (Supervisory Control And Data Acquisition) is adjusted simply under the current transformation device and communication network channel condition, and any additional device is avoided; the field application feedback result shows that the short circuit point direction is determined accurately, and the fault ranging result is accurate; the method can be popularized to fault determination in T power supply of other similar electric traction networks of double tracked railways.

Description

technical field [0001] The invention belongs to the design field of railway traction power supply and transformation systems, in particular to a fault judgment method for T-type power supply of a double-track traction network. Background technique [0002] The traditional traction substation's double-line traction network is powered by four feeders, such as figure 1 Shown is a schematic diagram of the traditional feeder mode of the multi-line power supply of the traction substation provided by the present invention. The traction substation is respectively connected to four lines connected to two sub-districts. If a traction fault occurs at this time, it can be clearly known which one If a fault occurs on the feeder, the fault location can be measured by using the impedance method. [0003] However, in some actual power supply schemes of electrified railway traction power supply systems (such as stations, multi-line introduction, hubs, etc.), in order to meet the specific im...

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Problems solved by technology

[0006] The purpose of the embodiment of the present invention is to provide a fault determination method for T-type power supply of double-track traction network, to solve the problem that in the prior art T-type power supply system of double-line traction network, the partitions need to be in separate operating states to determine the fault point The problem

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