Method and system for measuring polarization potential of buried metal pipeline
A metal pipe, polarization potential technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of affecting the measurement results of the polarization potential of the pipe and ground, and can not eliminate the IR drop, so as to achieve extremely easy implementation, eliminate IR drop, Simple operation effect
Pending Publication Date: 2021-02-12
CHINA ELECTRIC POWER RES INST +2
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[0005] Although the test piece electricity breaking method can eliminate the IR drop caused by the inflow / outflow current of the test piece (including the cathodic protection current of the pipeline itself and the ground electrode current entering and leaving the pipeline), it cannot eliminate the IR drop caused by the ground current near the test piece, especially For pipelines with a large ground current and a wide range of influence, such as adjacent high-voltage DC ground electrodes, the IR drop caused by the current in the soil will greatly affect the measurement results of the polarization potential of the pipe ground
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[0050] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0051] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a method and system for measuring the polarization potential of a buried metal pipeline, and belongs to the technical field of measurement of the polarization potential of metal in soil. The method comprises the following steps of: selecting a circular test piece, arranging reference electrodes around the test piece by taking the test piece as a center, and determining position information of the reference electrodes and the test piece; connecting the test piece provided with the reference electrodes with a buried metal pipeline at target soil, and after sufficient polarization, disconnecting the test piece from the buried metal pipeline to obtain measurement data at the moment of disconnection; determining a ground potential gradient between the reference electrodes caused by stray current according to the measurement data; and determining the polarization potential of the buried metal pipeline according to the ground potential gradient between the reference electrodes. The method and system are simple to operate and easy to implement.
Description
technical field [0001] The invention relates to the technical field of metal polarization potential measurement in soil, and more particularly, relates to a method and system for measuring the polarization potential of buried metal pipelines. Background technique [0002] Polarization potential is an important index for evaluating the cathodic protection effect of buried metal pipelines, which is mainly obtained by measuring the potential difference between the pipeline metal and the reference electrode. [0003] Directly measure the potential difference between the pipeline metal and the reference electrode. In addition to the required metal polarization potential, it also includes the IR drop of the soil between the pipeline metal and the reference electrode. The IR drop consists of two parts: one It is the IR drop caused by the inflow / outflow current through the pipeline, and the second is the IR drop caused by the ground current. [0004] The IR drop has two determining...
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Login to View More IPC IPC(8): G01N17/00G01N17/02
CPCG01N17/006G01N17/02
Inventor 白锋曹方圆赵录兴何堃黄流建何宁辉沙伟燕
Owner CHINA ELECTRIC POWER RES INST