Drag transmitting and transforming equipment

A technology for power transmission and transformation and equipment, which is applied in the field of locomotive traction power transmission and transformation devices, can solve the problems of high electricity costs for electrified railways, inability to improve power quality, poor stability and adjustability, etc., and achieve economical, safe and reliable operation guarantees, Provide train starting energy and avoid the effect of electrical phase separation

Active Publication Date: 2007-02-07
CHENGDU SHANGHUA ELECTRIC CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Although there is an automatic over-phase separation device, due to its high voltage and frequent switching actions, there are serious problems in its accuracy and reliability, and it cannot completely solve the adverse effects of electric separation on locomotive operation.
[0007] (2) High-speed and heavy-duty transportation all require large-capacity power supply. In order to meet the national standard for the power system to restrict the power quality of electrified railways, the reactive power compensation technology used in the original single-phase power supply mode has been changed. unable to adapt
If the adjustable symmetrical compensation technology is adopted in the traction substation, even if the AC-DC-AC power supply (regardless of its reactive power and harmonics) is used on the locomotive, the negative sequence is more prominent because of the larger capacity, technically and econom

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Embodiment

[0024] figure 1 , figure 2 As shown, a specific embodiment of the present invention is: a traction power transmission and transformation equipment, which is composed of: a three-phase transformer 1 is connected to a public high-voltage power grid, a single-phase transformer 5 is connected to a railway traction load 6, and a three-phase transformer 1 A three-phase rectifier / inverter 2, a DC energy storage device 3, and a single-phase rectifier / inverter 4 are sequentially connected to the single-phase transformer 5. The DC energy store 3 is also connected to an auxiliary power supply 7 .

[0025] figure 2 It is also shown that the device of the present invention is installed in the traction substation along the railway, and the traction load is powered by the device of the present invention in the same phase. For the convenience of maintenance, segmental insulators 8 are provided between the traction substations.

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Abstract

The invention relates to a drawing transformer, which comprises: a three-phase transformer connected to the public electric network; one single-phase transformer connected to the railway drawing load; one three-phase rectify inverter, one direct-current energy storage device, and one single-phase rectify inverter are connected between three-phase transformer and single-phase transformer. Said device can output same phase at nearby transform stations of railway, without dividing phase; and the power of each transformer is stable, to form high-speed and high-load operation of machine.

Description

Technical field [0001] The invention relates to a locomotive traction power transmission and transformation device. Background technique [0002] The single-phase system has the advantages of simple structure, low construction cost, convenient operation and maintenance, etc., which determines that single-phase power frequency AC power is generally used to power railway locomotives in electrified railways. The power system hopes that all loads will use the three-phase symmetrical fundamental current from the power grid to make full use of the capacity of equipment and lines and reduce the harm of reactive current and harmonic current to the system. In order to meet this requirement, the electrified railway adopts the scheme of phase sequence rotation and phase-by-phase power supply, that is, every 20-25km along the railway line is regarded as a power supply section, and each section is powered by different phases in the power grid in turn. A phase separation section of about...

Claims

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Application Information

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IPC IPC(8): H02M5/44H02J3/28B60M3/00B60M3/02
Inventor 李群湛贺建闽易东郭育华高师湃张昆仑何晓琼张丽郭锴郭世明余俊祥张文丽张丽艳刘炜
Owner CHENGDU SHANGHUA ELECTRIC CO LTD
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