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Calculation method of subway stray current and the transformer neutral point DC current caused by it

A technology for neutral point and stray current of transformers, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as numerical relationship not quantitatively analyzed, and achieve the effect of fast iteration

Active Publication Date: 2022-05-17
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 subway stray current and the transformer neutral point DC current caused by it
  • Calculation method of subway stray current and the transformer neutral point DC current caused by it
  • Calculation method of subway stray current and the transformer neutral point DC current caused by it

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Embodiment Construction

[0047] The content of the present invention will be further described and explained below in conjunction with the accompanying drawings.

[0048] figure 1 It is a flowchart of the present invention.

[0049] 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 the stray current of a subway and the direct current of a neutral point of a transformer caused by the method. The method includes step 1: the structure of the subway system "rail-drainage network-earth" is equivalent to a three-layer resistance network model, and divide the resistor network into several segments on average; step 2: analyze the flow path of transformer DC bias caused by stray current, and add the current branch of transformer DC bias caused by stray current to the resistor network model; step 3: The resistor network model is used, and the KVL equations are listed along the respective loops to obtain the loop current equation; Step 4: Use the LU decomposition method to solve the loop current equation, and calculate the stray current leaked from the track and the neutral point current of the transformer. This method can calculate the transformer neutral point current and stray current distribution curve under subway operation, and provides a theoretical basis for the impact assessment of transformer DC bias caused by stray current.

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 Patents(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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