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Measurement method for alternating-current resistance of cable conductor

A cable conductor and AC resistance technology, applied in the field of power transmission and transformation, can solve the problems of small resistance value of large-section conductors, measurement result errors, and the influence of measurement signal interference factors, etc., to achieve convenient measurement, good consistency, improved accuracy and The effect of collection rate

Inactive Publication Date: 2014-12-31
CHINA ELECTRIC POWER RES INST +2
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  • Claims
  • Application Information

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Problems solved by technology

Because the conductors of high-voltage cables are generally copper conductors, especially the resistance value of large cross-section conductors is very small, and the AC resistance measurement system needs to use alternating current, the measurement signal is easily affected by various interference factors, resulting in large errors in measurement results

Method used

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  • Measurement method for alternating-current resistance of cable conductor
  • Measurement method for alternating-current resistance of cable conductor
  • Measurement method for alternating-current resistance of cable conductor

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Embodiment Construction

[0026] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] The schematic diagram of the conductor AC resistance measuring device provided by the invention is as figure 1 As shown, including: cable conductor 1, clamp 2, feed-through transformer 3, voltage regulator 4, current transformer 5, voltage measurement terminal 6, thermal resistance 7, voltage acquisition card 8, temperature acquisition card 9, current acquisition card 10 and shielded wire 11.

[0028] The cable conductor 1 sample is surrounded and connected by the clamp 2 to form a closed loop, and the closed loop passes through the feed-through transformer 3; the feed-through transformer 3 and the voltage regulator 4 are connected to apply a large current to the closed loop; the feed-through transformer 3 and the voltage regulator The device 4 is connected with the control system respectively, and is used for ad...

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Abstract

The invention relates to a measurement method for alternating-current resistance of a cable conductor. The method comprises the following steps: applying large current to a conductor loop by adopting a voltage regulator and a straight-thought transformer; after the temperature of the conductor is stable by long-time current heating and temperature raising, synchronously measuring voltage and loop current in one section of the conductor and the surface temperature of the conductor; extracting amplitudes and phases of voltage and current signals by Fourier transformation, and calculating a phase difference between the voltage and the current; finally, calculating the alternating-current resistance of the conductor by adopting a formula. The method is high in measurement precision, good in stability, good in consistency of repeated measurement, simple in structure and convenient to measure, and is particularly suitable for measuring the alternating-current resistance of the cable conductor with a large section.

Description

technical field [0001] The invention relates to a method for power transmission and transformation technology, in particular to a method for measuring the AC resistance of a cable conductor. Background technique [0002] When using a DC cable to transmit electric energy, the distribution of the current along the cross section of the cable conductor is actually uniform, but in the case of AC, the distribution of the current along the cross section of the conductor changes, and the current density increases near the surface of the conductor, and the closer to the conductor The smaller the current density in the center, the phenomenon that this alternating current concentrates on the surface of the conductor is called the skin effect. In recent years, the use rate of large-section cables in the power grid system has been increasing, and the skin effect generated by the cables when passing AC current will become more serious with the increase of the conductor cross-section, resu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08
Inventor 邓显波赵健康欧阳本红樊友兵刘松华
Owner CHINA ELECTRIC POWER RES INST
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