Cut-off ground fault recognition method for electrified railroad AT power supply contact system

A technology for electrified railways and grounding faults, which is applied to fault locations, electrical components, emergency protection circuit devices, etc.

Active Publication Date: 2009-04-08
NARI TECH CO LTD +1
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  • Cut-off ground fault recognition method for electrified railroad AT power supply contact system
  • Cut-off ground fault recognition method for electrified railroad AT power supply contact system
  • Cut-off ground fault recognition method for electrified railroad AT power supply contact system

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] In order to identify the disconnection and grounding fault of the AT power supply catenary of the electrified railway, the method for identifying the disconnection and grounding fault of the catenary of the AT power supply of the electrified railway provided by the present invention comprises the following steps:

[0028] (1) Determine whether the identification element meets the start-up condition;

[0029] (2) Calculate the real-time power factor according to the bus voltage and feeder current;

[0030] (3) According to the 1st, 2nd, 3rd, 5th and 7th harmonics of the feeder current, calculate the adaptive control amount and the second harmonic content;

[0031] (4) Determine whether the power factor adjusted by the adaptive control amount is within the action range, whether the adaptive control amount is within the action range, and whether the second harmo...

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Abstract

The invention relates to an identifying method for the line breaking and ground faults of an AT power supply contact network of an electrified railway which comprises: judging and identifying whether an element achieves the starting condition or not; calculating a real time power factor according to a bus voltage and a feeder line current; calculating the self-adapting control amount and the secondary harmonic content according to the harmonics 1. 2, 3, 5 and 7 of the feeder line current; judging whether the power factor regulated by the self-adapting control amount and the self-adapting control amount are in the motion range or not and judging whether the secondary harmonic content is smaller than a setting value or not; if yes, all the conditions can be met; then giving out alarming signal or tripping, uploading the failure data information; or quitting and initializing the identifying element. The identifying method can identify the high impedance failure formed by line breaking and grounding and ensure the identifying element for the feeder line protection device of a microcomputer to be not mistakenly moved when various electric power engines run under load, under the temporary state of exciting surges and under the working condition of heavy load; simultaneously, the identifying method solves the problem of failure to operate of the normal protections after the stepout of the AT (autotransformer).

Description

technical field [0001] The invention belongs to the technical field of electric engineering, and more precisely, the invention relates to a method for identifying disconnection and grounding faults of an AT power supply catenary of an electrified railway. Background technique [0002] At present, China's railway construction has entered a new peak period. In the future, high-speed railways, heavy-duty railways or passenger dedicated lines will sample the new and advanced AT (autotransformer) power supply mode. When the power supply line is disconnected due to mechanical faults such as scratches and foreign objects, it usually forms a one-side grounding fault and the other side is suspended. This fault may have a high impedance value, and the fault current felt by the feeder protection device installed in the traction substation It is similar to the load current, so that the conventional protection components cannot respond, the circuit breaker cannot trip and may cause the t...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
Inventor 安林王军徐石明江平王善祥王文荣刘剑欣
Owner NARI TECH CO LTD
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