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Long-range power cable insulation online monitoring method based on resistive current separation process

A power cable and resistive current technology, applied in the field of long-distance power cable insulation on-line monitoring, can solve problems such as difficult to use, cross-connection of metal sheaths, etc., and achieve the effect of wide application range and correct and effective measurement results.

Inactive Publication Date: 2017-05-31
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

The loss factor tanδ method is to use the current transformer and the voltage transformer to measure the current flowing through the cable insulation and the voltage applied to the cable, and then measure the tanδ value of the cable insulation through a digital measurement device; but because the XLPE insulation tanδ value is generally are small, making the method less likely to be adopted
[0006] For high-voltage, long-distance power cables, there are problems of metal sheath cross-connection and voltage drop, making the above methods not applicable

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  • Long-range power cable insulation online monitoring method based on resistive current separation process
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  • Long-range power cable insulation online monitoring method based on resistive current separation process

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Embodiment Construction

[0026] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Furthermore, it should be understood that development work, while potentially complex and time-consuming, would be a routine undertaking for those skilled in the art having the benefit of this disclosure.

[0027] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the solution ac...

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Abstract

The invention discloses a long-range power cable insulation online monitoring method based on resistive current separation process, comprising: mounting a current transformer and a voltage transformer at the front and rear ends of each phase of a three-phase power cable respectively; acquiring leak current passing through this phase of the power cable main insulation according to a difference between the measured front current value and rear current value of the phase, and determining a reference voltage of this phase according to half of a phase sum of the measured front voltage and rear voltage of the phase; calculating equivalent impedance value of this phase of the power cable insulation according to the reference voltage of this phase and the leak current passing through the phase of the power cable main insulation, in order to further calculate resistive current and capacitive current values of each phase of the power cable, so that the resistive current can be isolated from the leak current from cable insulation. Online monitoring for long-range power cable insulation is achieved through the resistive current flowing through the cable insulation.

Description

technical field [0001] The invention relates to the technical field of high voltage and insulation, in particular to an on-line monitoring method for long-distance power cable insulation based on a resistive current separation method. Background technique [0002] Cross-linked polyethylene (XLPE) power cables have been widely used in transmission and distribution networks of various voltage levels in power systems due to their good insulation properties, mechanical properties, thermal properties and high power supply reliability. , has become an important part of the city's power supply and main grid, and is constantly developing into the field of high voltage and ultra-high voltage. XPLE cable line is in the initial stage of operation, generally 1-5 years, and the quality problems of cables and accessories or laying and installation are prone to failure; in the middle stage of operation, generally 5-25 years, the probability of cable line failure is low, but the cable Ther...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/12G01R19/25
CPCG01R31/088G01R19/25G01R31/1272
Inventor 朱博魏新劳王永红聂洪岩官瑞杨
Owner HARBIN UNIV OF SCI & TECH
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