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Switch-free switching auto-passing neutral section device for the electric railway

An automatic over-phase and electrified railway technology, applied in electric vehicles, collectors, power lines, etc., can solve the problems of increasing the cost of operation and maintenance, affecting the reliability of automatic over-phase, and improve the reliability and safety of power supply. , the effect of reducing adverse effects and reducing investment costs

Active Publication Date: 2010-07-07
李子晗
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of automatic over-phase separation is that the switch needs to switch frequently, and the overvoltage generated during the switching process affects the life of the switch, which not only affects the reliability of automatic over-phase separation, but also requires frequent replacement of the switch, which increases the Operation and maintenance costs

Method used

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  • Switch-free switching auto-passing neutral section device for the electric railway
  • Switch-free switching auto-passing neutral section device for the electric railway

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specific Embodiment approach

[0020] figure 1 Shown, a kind of embodiment of the present invention is: in a kind of electrified railway non-switch switching automatic phase splitting device, the three-phase input terminals A, B, C of the three-phase-two-phase transformer T of the traction substation are respectively connected with The three phases of the public grid are connected, and there is a high-voltage large-resistance resistor R connected in series between the power supply arms U, D of any output phase α, β and the catenary neutral section M1 at the exit of the traction substation; the traction substation A high-voltage large-value resistor R is also connected in series between the end of any power supply arm U and D of the substation and the catenary neutral section M2 between the two traction substations.

[0021] In this example, the withstand voltage of the high voltage and large resistance resistor R is greater than 27.5kV, and the resistance value is 150-1500Ω.

[0022] figure 1 It also show...

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Abstract

The invention relates to a switch-free switching auto-passing neutral section device for the electric railway, which is characterized in that high voltage large resistance electric resistance Rs are connected in series among a power supply arm U and a power supply arm D of any output phase alpha and beta of a three-phase-two-phase transformer T of a traction substation and a contact network neutral section M1 at the exit of the traction substation; the high voltage large resistance electric resistance Rs are also connected in series between ends of the power supply arm U and D of the traction substation and the contact network neutral section M2.The auto-passing neutral section device dispenses with a high voltage switch or a breaker, avoids transient overvoltage due to frequent switching, realizes safe and reliable auto-passing neutral section of an electric locomotive and saves operation costs and maintenance fees.

Description

technical field [0001] The invention relates to a non-switch switching automatic phase separation device for an electrified railway. Background technique [0002] The single-phase system has the advantages of simple structure, low construction cost, convenient operation and maintenance, etc., which determines that the railway system generally uses single-phase power frequency AC power supply for railway locomotives on electrified railways. As a power supply department, the power system hopes that the railway system will draw current symmetrically from the grid in three phases, so as to avoid causing excessive negative sequence current in the grid. In order to meet this requirement, the electrified railway adopts the scheme of phase sequence rotation and phase-by-phase power supply. Every 20-25km along the railway line is used as a power supply section, and each section is powered by different phases in the power grid in turn. This method of segmented power supply and phase ...

Claims

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Application Information

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IPC IPC(8): B60L5/00B60M1/00
Inventor 李子晗陈民武周福林刘炜刘航
Owner 李子晗
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