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Measuring method using spark coefficient for correcting low-amplitude value impact resistance of tower grounding device

A grounding device and spark coefficient technology, applied in the field of low-amplitude impact resistance measurement, can solve problems such as large differences in impact coefficients

Active Publication Date: 2014-05-14
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, the impact coefficient is theoretically speculated, and the impact coefficient varies greatly in different soil environments and grounding devices of different sizes. Therefore, the method of estimating the power frequency grounding resistance in the prior art will produce a large error and cannot meet the requirements. Due to the actual needs of the project, the low-amplitude impact resistance measurement of the grounding device is still a blank in the industry

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  • Measuring method using spark coefficient for correcting low-amplitude value impact resistance of tower grounding device
  • Measuring method using spark coefficient for correcting low-amplitude value impact resistance of tower grounding device
  • Measuring method using spark coefficient for correcting low-amplitude value impact resistance of tower grounding device

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[0090] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any use of the same characteristic parameters and evaluation methods of the present invention should be included in the protection scope of the present invention.

[0091] Such as Figure 1-9 As shown in , the excitation of the measurement method is provided by a portable impulse current generator, and the impulse current generated by it requires: the amplitude is in the range of 5A ~ 50A, and the wave head time meets the double exponential wave of 1.0μs ~ 5.0μs; the measurement system For: a multi-channel digital oscilloscope, connect the shunt and voltage output terminals of the impulse current generator to channel 1 and channel 2 of the digital oscilloscope respectively through coaxial cables.

[0092] The measurement method of impact grounding resistance of s...

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Abstract

Provided is a measuring method using a spark coefficient for correcting low-amplitude value impact resistance of a tower grounding device. A portable impulse current generator is used as a signal output source, a three-level measuring mode is adopted to arrange the grounding device, an UPS is used for supplying power to inject impulse currents from a grounding electrode, a spark coefficient alpha of soil where the grounding device located is calculated, and initial impulse grounding resistance Rc obtained through convolution calculation is corrected according to the spark coefficient alpha obtained through calculation. According to the measuring method using the spark coefficient for correcting the low-amplitude value impact resistance of the tower grounding device, standard impulse grounding resistance under lightning currents is obtained by adopting the convolution calculation and a spark coefficient modification method, the inductive effect of the grounding device and spark discharge of the soil can be taken into consideration effectively, the corrected impulse grounding resistance is more similar to practical situations when electric transmission lines are struck by lightning. The measuring method using the spark coefficient for correcting the low-amplitude value impact resistance of the tower grounding device solves the problems that only power frequency grounding resistance can be adopted to carry out approximate estimation and field measurement cannot be carried out in the prior art are solved.

Description

technical field [0001] The invention relates to the field of lightning protection for transmission lines, in particular to a method for measuring low-amplitude impact resistance. Background technique [0002] The impact grounding resistance of tower grounding devices on transmission lines is the main factor affecting the lightning resistance level of transmission lines. Accurate measurement of the impact grounding resistance of tower grounding devices can provide a reliable basis for lightning protection design of transmission lines and improve the safe operation level of transmission lines. [0003] The impact grounding resistance of the tower grounding device refers to the ratio of the peak voltage of the grounding device to the peak value of the lightning current flowing through the grounding device under the action of lightning current: [0004] R ch = U m I ...

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Application Information

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IPC IPC(8): G01R27/20
Inventor 朱昌成汪涛鲁海亮文习山冯志强
Owner STATE GRID CORP OF CHINA
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