Novel step voltage calculation method based on circular ring-shaped DC power transmission earth electrode different buried depths

A step-voltage, DC transmission technology, applied in the direction of measuring current/voltage, measuring only voltage, measuring electrical variables, etc., can solve problems such as aggravating equipment loss, threatening the safe and stable operation of AC-DC hybrid power grid, and shortening the life of pipe network.

Active Publication Date: 2018-03-23
JIANGSU UNIV
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Problems solved by technology

The step voltage caused by the DC ground potential distribution may affect the safety of humans and animals
The galvanic corrosion caused by DC ground current overflow may shorten the life of the p

Method used

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  • Novel step voltage calculation method based on circular ring-shaped DC power transmission earth electrode different buried depths
  • Novel step voltage calculation method based on circular ring-shaped DC power transmission earth electrode different buried depths
  • Novel step voltage calculation method based on circular ring-shaped DC power transmission earth electrode different buried depths

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0063] Such as figure 1 , figure 2 As shown, the DC ring electrode is bent by a round conductor, the diameter of the round conductor is 2a, and the diameter of the ring is 2b. The current flowing into the medium through the ring is I, and it flows evenly along the circumference of the ring. In general, b>>a, so when the DC current overflows from the round conductor, it can be considered to be concentrated on the axis of the conductor. If δ is used to represent the overflow density on the surface of the pole ring, then:

[0064]

[0065] Due to the symmetry of the ring, the cylindrical coordinate system is selected, and the potential of any point N(r, o, z) in the space around the DC ring electrode can be obtained from the figure as:

[0066]

[0067] ρ is the resistivity of the earth soil, δ is the overflow density on the surface of th...

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Abstract

The present invention discloses a novel step voltage calculation method based on circular ring-shaped DC power transmission earth electrode different buried depths. The method comprises the followingtwo situations of (1) analyzing the potential distribution that the homogeneous medium circular ring-shaped earth electrodes are not buried at the equal depth to obtain a calculation expression of a step voltage on an earth surface; (2) analyzing the potential distribution that the horizontal dual-layer medium circular ring-shaped earth electrodes are not buried at the equal depth to obtain a calculation expression of the step voltage on the earth surface; utilizing a MALTAB software to simulate to obtain the results and the influence of different earth electrode ring numbers and different buried depths on a surface potential, thereby demonstrating that the method provided by the present invention enables the step voltage to be reduced. The present invention creatively provides the thoughtthat the dual-circular ring-shaped earth electrodes are not buried at the equal depth, the calculation is simple, and the operation speed is fast.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission engineering, and in particular relates to a novel calculation method for step voltages based on different buried depths of annular direct current transmission grounding electrodes. Background technique [0002] With the large-scale construction of DC transmission projects, the negative effects of electromagnetic effects, thermal effects and electrification effects brought about by DC unbalanced operation can no longer be ignored. The step voltage caused by the DC ground potential distribution may affect the safety of humans and animals. The galvanic corrosion caused by DC ground current overflow may shorten the life of the pipe network, and the bias effect caused by DC ground current shunt may aggravate equipment loss, which threatens the safe and stable operation of the AC-DC hybrid power grid in severe cases. In the UHV large sending end area, the number of grou...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/0084
Inventor 王露笛莫付江陈惠许梦素汪培培刘欣桐吴政涛
Owner JIANGSU UNIV
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