Method and device for detecting ground fault of traction converter

A traction converter and ground fault technology, which is used in measurement devices, testing electrical devices in transit, and power-consuming devices, etc., to achieve the effects of simple and effective algorithms, avoidance of downtime events, and rapid construction

A traction converter and ground fault technology, which is used in measurement devices, testing electrical devices in transit, and power-consuming devices, etc., to achieve the effects of simple and effective algorithms, avoidance of downtime events, and rapid construction

CN111766534BActive Publication Date: 2021-07-13CRRC YONGJI ELECTRIC CO LTD
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  • Method and device for detecting ground fault of traction converter
  • Method and device for detecting ground fault of traction converter
  • Method and device for detecting ground fault of traction converter

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] The electrical main circuit of the traction converter is as figure 1 Shown; main components: rated input 25KV50Hz transformer, pre-charging module, four-quadrant rectifier, intermediate DC circuit, grounding detection module, inverter module.

[0048] Wherein, the pre-charging module includes a pre-charging contactor K1 and a main working contactor K2; the four-quadrant rectifier includes two bridge arms: an A bridge arm and a B bridge arm, and a total of 4 switch tubes (AH, AB, BH, BB ), the secondary side of the transformer is connected to the four-quadrant rectifier A and B bridge arms through two wires; the intermediate DC circuit includes a DC side support capacitor C1, a DC bus voltage sensor TV1 and a ground detection module; the ground detection module includes a capacitor C2, a series connection Resistors R2 and R3, the resistance values ​​of R2 and ...

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Abstract

The invention relates to ground fault detection of a traction converter, in particular to a ground fault detection method and device for a traction converter. The invention solves the problems existing in the existing traction converter ground fault detection method. The detection method of the present invention can detect various ground faults online in real time without shutting down and complicated detection logic, and can distinguish the input ground fault terminals of the four-quadrant rectifier and the U, V, W phase ground fault terminals of the inverter. The detection device of the present invention makes full use of the inherent resources on the locomotive, and only needs to add some detection boards to complete the construction of the detection circuit. Traction converter ground fault detection device, including collecting DC bus voltage U dc The sensor TV1 collects the DC bus negative terminal-to-ground voltage U gnd The sensor TV2 also includes a voltage comparator, a DC bus positive and negative ground fault judgment module, a trigger, a divider, a switch control module, a filter processing module, a multiplier, an integrator, and a four-quadrant inverter ground fault judgment module.

Description

technical field [0001] The invention relates to ground fault detection of a traction converter, in particular to a ground fault detection method and device for a traction converter. Background technique [0002] Traction converter is the core component of train electric transmission system, its high reliability is an important guarantee for the safe and stable operation of trains, ground fault is the most frequent type of fault among various faults of traction converter, generally speaking, single A point ground fault will not affect the operation of the converter, but when two or more point ground faults occur, it will cause a short circuit fault and cause serious damage to the train traction system, and even threaten the personal safety of passengers. Therefore, when a single-point ground fault occurs in the traction converter, how to quickly and accurately detect the ground point in the online state without shutting down is very critical, thereby avoiding the occurrence o...

Claims

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Application Information

Patent Timeline
13 Jul 2021
Publication
CN111766534B
IPC
G01R31/52; G01R31/56
CPC
G01R31/008; G01R31/52; G01R31/56; B60L3/0069; B60L2200/26; B60L50/51; B60L9/24; Y02T10/70
Inventors
苏鹏程; 王龙刚