Pipe-to-soil potential excessively-negative control method and device for buried pipeline

A technology of buried pipeline and pipe-to-ground potential, which is applied to control/regulating systems, regulating electrical variables, instruments, etc., to achieve the effect of convenient installation and maintenance, small device size, and solving instantaneous large interference

Active Publication Date: 2014-12-17
PIPECHINA SOUTH CHINA CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to invent a method and device for controlling the over-negative potential of the buried pipeline, which prevents the over-negative

Method used

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  • Pipe-to-soil potential excessively-negative control method and device for buried pipeline
  • Pipe-to-soil potential excessively-negative control method and device for buried pipeline
  • Pipe-to-soil potential excessively-negative control method and device for buried pipeline

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Embodiment

[0025] Embodiment. Below in conjunction with accompanying drawing, the invention will be further described. This example is a test prototype, and the principle of the buried pipeline ground potential over-negative control device is as follows: figure 2 shown. The output of the voltage reference original circuit is connected to the signal acquisition comparison and trigger control circuit, and the signal acquisition comparison and trigger control circuit continuously performs signal acquisition and signal feedback of the pipe-ground potential with the buried pipeline system, and the output of the signal acquisition comparison and trigger control circuit is passed through the photoelectric The coupling control is connected to the reverse compensation control circuit, the output of the reverse compensation control circuit is connected to the anti-backflow controller, the output of the anti-backflow controller is connected to the buried pipeline system, and the diode inside the an...

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PUM

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Abstract

The invention relates to a pipe-to-soil potential excessively-negative control method and device for a buried pipeline which suffers from DC spurious emission interference. A voltage reference source is used as a signal collecting comparison and triggering control circuit to trigger and control a based threshold value; when the pipe-to-soil potential collected by the signal collecting comparison and triggering control circuit A02 exceeds the specified value of the threshold value, an operational amplifier in the circuit outputs in the forward direction, a photoelectric coupler is triggered and connected, and a reverse compensation control circuit A03 is triggered to start applying a forward current to the pipeline; when the pipe-to-soil potential collected by the signal collecting comparison and triggering control circuit A02 has already returned within the allowed range of the set threshold value, the operational amplifier is free of output, the photoelectric coupler is not triggered, optoelectronic isolation takes effect, trigger control is canceled, and the reverse compensation control circuit A03 stops working. The pipe-to-soil potential excessively-negative phenomenon due to the fact that the pipeline suffers from DC interference is avoided, and the hydrogen brittleness and coating stripping danger of the pipeline can be eliminated.

Description

technical field [0001] The invention relates to a control method and device for solving the over-negative potential of buried pipelines suffering from direct current stray interference. It relates to the technical field of piping systems. Background technique [0002] In recent years, with the high-speed construction of urban express rail, high-voltage direct current transmission lines and oil and gas pipelines, there are more and more crossing and parallel phenomena between them and buried oil and gas pipelines, and energy "public corridors" are becoming more and more common. However, the electric field environment, abnormal working conditions and grounding settings of the DC transmission line, as well as the light rail system with DC as the excitation source, will cause DC stray current interference to its adjacent buried steel pipelines. Stray current interference source) in the area where the pipe-ground potential shifts positively to cause corrosion, while in the area ...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 陈新华黄维和张丰赵君赵晋云陈振华徐承伟姜有文毕武喜刘文会陈洪源薛致远刘玲莉王禹钦康金静
Owner PIPECHINA SOUTH CHINA CO
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