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Through flexible traction substation based on existing traction transformer and protection configuration method thereof

A traction transformer and traction substation technology, which is applied to emergency protection circuit devices, output power conversion devices, power lines, etc. Phase uncontrollable problems

Active Publication Date: 2022-05-06
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a through-flexible traction substation based on the existing traction transformer and its protection configuration method, which solves the uncontrollable voltage amplitude and phase of the traction network side, the utilization rate of the traditional traction transformer Low, large negative sequence current on the input grid side and incompatibility with traditional traction substation protection methods

Method used

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  • Through flexible traction substation based on existing traction transformer and protection configuration method thereof
  • Through flexible traction substation based on existing traction transformer and protection configuration method thereof
  • Through flexible traction substation based on existing traction transformer and protection configuration method thereof

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Embodiment 1

[0117] Such as figure 1 and figure 2As shown, the present invention provides a through flexible traction substation based on existing traction transformers, including existing traction transformers, matching transformers, three-phase-single-phase converters and several circuit breakers; the existing traction The three primary phases of the transformer are respectively connected to phase A, phase B, and phase C of the three-phase grid in one-to-one correspondence, the secondary phase b of the existing traction transformer is always connected to the rail ground, and the secondary phase a of the existing traction transformer passes through The circuit breaker QF1 is connected to the bus A, and the secondary phase C of the existing traction transformer is connected to the bus B through the circuit breaker QF3; Phase a, phase b and phase c of the secondary side of the transformer are connected in one-to-one correspondence, and the secondary side of the matching transformer includ...

Embodiment 2

[0198] Such as Figure 7 as shown, Figure 7 It is a schematic diagram of the power supply structure of the through-flexible traction substation with protection devices. In order to realize the safe power supply of the substation, the protection methods configured for each part of the substation are as follows:

[0199] (1) The distance protection is set at the feeder of the flexible traction substation as the main protection, the over-current protection and current increment protection for low-voltage start are used as the backup protection, and the current quick-break protection is used as the auxiliary protection.

[0200] Install a voltage and current transformer at the installation position of the feeder protection, measure the voltage and current at the feeder, and calculate the measured impedance at this time. If it is less than the set value, the distance protection will operate. When the distance protection refuses to operate and meets the low voltage and high current...

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Abstract

The invention provides a through flexible traction substation based on an existing traction transformer and a protection configuration method of the through flexible traction substation. Comprising an existing traction transformer, a matching transformer, a three-phase-single-phase converter and a plurality of circuit breakers. The through flexible traction substation can return to an existing power supply mode when the three-phase-single-phase converter has a serious fault. According to the invention, the influence of the unbalanced secondary side voltage of the existing traction transformer on the three-phase-single-phase converter is reduced, and meanwhile, the power supply reliability of the power supply interval of the through flexible traction substation is improved. According to the invention, negative sequence over-current protection is added in matching transformer protection, so that the safety of the transformer in an asymmetric fault is improved; and a reconfiguration switch is arranged at the output side of the power module of the three-phase-single-phase converter of the flexible traction substation, so that when the module has a non-short-circuit fault, the self-healing reconfiguration of the converter can be realized through the driving pulse blocking and reconfiguration switch, and the safe and reliable operation of the flexible traction substation is realized.

Description

technical field [0001] The invention belongs to the technical field of traction power supply, and in particular relates to a through-flexible traction substation based on an existing traction transformer and a protection configuration method thereof. Background technique [0002] At present, the existing electrified railways in China adopt a three-phase-two-phase power supply mode. The substation takes power through the three-phase grid, and after being stepped down by the traction transformer, it is divided into two power supply arms for output. Because the voltage amplitude, phase and frequency are different between the two power supply arms and between the two substations, there is an electrical phase split between the two power supply arms and the two traction substations. The existence of electrical separation restricts the running speed of trains on the line, and there are potential safety hazards; in addition, the capacity between the two substations cannot be used as...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02H7/26H02H7/22H02M5/458H02M1/32B60M3/00
CPCH02J3/36H02H7/26H02H7/262H02H7/22H02M5/4585H02M1/32B60M3/00
Inventor 何晓琼张洪金黄通跃黄建赵敏韩鹏程曾理杨顺风吕晓琴马兰陆可林静英舒泽亮高仕斌
Owner SOUTHWEST JIAOTONG UNIV
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