Calculation method of stray current and neutral point dc current of transformer caused by stray current in metro

A transformer neutral point, stray current technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as quantitative analysis of numerical relationships, and achieve the effect of fast iteration

Active Publication Date: 2019-01-22
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The current research is based on actual cases and tracking monitoring data, and qualitatively analyzes the correlation between subway stray current and transformer DC bias phenomenon, and does not quantitatively analyze the numerical relationship between the two.

Method used

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  • Calculation method of stray current and neutral point dc current of transformer caused by stray current in metro
  • Calculation method of stray current and neutral point dc current of transformer caused by stray current in metro
  • Calculation method of stray current and neutral point dc current of transformer caused by stray current in metro

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Embodiment Construction

[0049] The content of the present invention will be further described and explained below in conjunction with the accompanying drawings.

[0050] figure 1 It is a flowchart of the present invention.

[0051] Such as figure 2 As shown, in the subway stray current monitoring system, the stray current leaked from the rails will be collected by the drainage network, and returned to the traction substation after the diode of the drainage cabinet is turned on. However, when the DC stray current interference is serious, the stray current The current is difficult to be fully collected and partly leaks into the ground. This part of the current flows into the grounding network of the surrounding substation A through the soil, enters the neutral point grounded transformer A', flows into the transformer B' of another substation B after passing through the transmission line, and finally flows into the grounding neutral point of the transformer B' The ground grid returns to the negativ...

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Abstract

The invention discloses a method for calculating stray current and neutral point direct current of transformer caused by stray current in a metro. The method comprises the following steps: 1. The structure of rail-drain network-earth in metro system is equivalent to a three-layer resistance network model, and the resistance network is divided into several sections equally; 2, that flow path of theDC bias magnetic field of the transformer caused by stray current is analyzed, and a current branch of the DC bias magnetic field of the transformer caused by stray current is added into the resistance network model; 3, KVL equations along respective loop are arranged to obtain loop current equations for that built resistance network model; 4, a loop current equation is resolved by using the LU decomposition method, and the stray current of the rail leakage and the neutral point current of the transformer is calculated. This method can be used to calculate the distribution curves of neutral current and stray current of transformer under subway operation, which provides a theoretical basis for evaluating the influence of stray current on DC magnetic bias of transformer.

Description

technical field [0001] The invention relates to a method for calculating the stray current of a transformer subway and the direct current at the neutral point of a transformer caused by it. Background technique [0002] With the continuous acceleration of urbanization, safe and convenient urban rail transit plays an indispensable role in the construction of modern cities. However, while bringing convenience to people's lives, it is also accompanied by a series of negative problems. At present, the power supply of domestic subway trains mostly adopts DC traction power supply mode. The current required by the locomotive is provided by the traction substation. Since the rail is resistive and carries current, there is a voltage drop across the rail to ground. At the same time, the rail is not completely insulated from the ground, but there is a certain transition resistance. Therefore, during the operation of subway trains, current leaks from the rails and flows into the groun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 彭平周卫华曾祥君喻锟倪砚茹冷阳毛文奇刘赟刘味果
Owner STATE GRID HUNAN ELECTRIC POWER
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