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Real-time diagnosis method of short-circuit fault of vehicle-mounted transformer in high-voltage operation state

A short-circuit fault and operating state technology, which is applied in the field of electrical systems, can solve problems such as inability to accurately diagnose short-circuit faults of vehicle-mounted transformers, and achieve the effects of avoiding unprotected risks, improving safety, and accurately diagnosing

Active Publication Date: 2019-12-31
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem solved by the present invention is: in the prior art, the short-circuit fault of the vehicle-mounted transformer cannot be accurately diagnosed in time

Method used

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  • Real-time diagnosis method of short-circuit fault of vehicle-mounted transformer in high-voltage operation state
  • Real-time diagnosis method of short-circuit fault of vehicle-mounted transformer in high-voltage operation state
  • Real-time diagnosis method of short-circuit fault of vehicle-mounted transformer in high-voltage operation state

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Experimental program
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Effect test

Embodiment 1

[0065] This embodiment relates to a real-time diagnosis method for a secondary side short-circuit fault in a real-time diagnosis method for a short-circuit fault of a vehicle-mounted transformer in a high-voltage operating state.

[0066] When the vehicle-mounted transformer is short-circuited on the secondary side, the analysis is as follows:

[0067] 1. The secondary side winding of the transformer is short-circuited, and its short-circuit current cannot flow through the current sensor on the AC side of the rectifier, and the secondary side short circuit cannot be judged directly through the AC side current of the rectifier.

[0068] 2. In the working state of the rectifier, if the secondary winding is short-circuited, the rectifier with bidirectional energy flow will quickly release the energy of the intermediate DC circuit through the short-circuit point, and the current on the AC side of the rectifier will immediately increase rapidly, reporting the overcurrent on the AC s...

Embodiment 2

[0084] This embodiment relates to a real-time diagnosis method for a short-circuit fault of a primary side in a real-time diagnosis method for a short-circuit fault of a vehicle-mounted transformer under a high-voltage operating state.

[0085] When the primary side of the vehicle transformer is short-circuited, there are the following analysis:

[0086]1. When the primary short circuit fault occurs in the transformer, the primary current collected by the primary current sensor increases rapidly, triggering the primary overcurrent protection. The primary side overcurrent protection will immediately block all rectifiers at the back end of the transformer, so that the rectifiers will stop working immediately and trigger the operation of disconnecting VCB. The stop of the rectifier can be completed within 1ms, but it takes dozens of ms to output the VCB off command to the final off state of the electrical switch;

[0087] 2. When the primary side is short-circuited and before VC...

Embodiment 3

[0103] This embodiment relates to a real-time diagnosis method for a short-circuit fault between turns in a real-time diagnosis method for a short-circuit fault of a vehicle-mounted transformer under a high-voltage operating state.

[0104] When the on-board transformer has an inter-turn short circuit, the following analysis is performed:

[0105] 1. A short circuit between turns of the transformer will cause the impedance of the secondary winding of the transformer to change. Therefore, it is possible to identify the short circuit impedance of the transformer online in real time to understand the impedance. The change of transformer impedance may be affected by the change of the electromagnetic characteristics of the transformer, rather than the inter-turn short circuit.

[0106] 2. In case of inter-turn short circuit of the transformer, the primary and secondary transformation ratios of the transformer will be inconsistent, resulting in a difference between the estimated val...

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Abstract

The invention provides a real-time diagnosis method of the short-circuit fault of a vehicle-mounted transformer in a high-voltage operation state. The method comprises a secondary side short circuit fault diagnosis method, a primary side short circuit fault diagnosis method and an interturn short circuit fault diagnosis method. Various kinds of short circuit faults such as the primary side, secondary side and interturn short circuit of the transformer can be diagnosed on line in real time; and corresponding protection measures are used.

Description

technical field [0001] The present disclosure relates to the field of electrical systems, in particular to a method for real-time diagnosis of a short-circuit fault of a vehicle-mounted transformer in a high-voltage operating state. Background technique [0002] With the development of high-power converter technology, electric locomotives or EMUs generally adopt the AC-DC-AC drive traction system. The AC drive traction system is mainly composed of pantograph, transformer, rectifier, intermediate DC circuit, inverter, traction motor and so on. The on-board transformer converts the high-voltage AC power of the railway power supply network into AC power of a lower voltage level, and its capacity is generally at the megavolt-ampere level. As an important electrical component of the traction system, once a short-circuit fault occurs in the on-board transformer, the transformer itself will heat up rapidly, and the temperature will rise, thereby damaging the transformer and even c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 付刚罗文广尚敬张志学黄浩陈志博彭赟胡景瑜王跃陈欣
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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