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Transient-state grounding body modeling method

A technology of transient modeling and grounding body, applied in the field of system model, which can solve the problems of large gap, large error in calculation results, and inability to accurately reflect the actual situation of grounding body.

Inactive Publication Date: 2012-06-20
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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Problems solved by technology

[0003] Since the above equivalent resistance method does not consider the influence of inductance, conductance and other factors, there is a large gap between the calculation results and the field measured data, especially under the conditions of inrush current and variable frequency current, the calculation results have large errors and cannot accurately reflect the grounding. The actual situation of the body under the action of lightning

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Embodiment Construction

[0060] 1. Theoretical modeling of grounding bodies:

[0061] Using the principle of equal external area, the grounding body of any shape is equivalent to a uniform (radius is equal everywhere) cylinder, and it is divided into segments. When the ultra-high frequency current acts, the uneven distribution of the grounding body current and wave propagation need to be considered. During the process, the grounding body is regarded as N segments ( figure 1 ) distributed parameter LCG transmission line circuit, its equivalent circuit is as Figure 1-2 shown. μ in the figure 0 , ε 0 , ε s , ρ, ρ s are the magnetic permeability constant of air and soil, air permittivity, soil permittivity, air resistivity and soil resistivity, h is the buried depth of the grounding body, l is the length of the grounding body, and a is the equivalent radius of the grounding body. U(t), I(t) are the time-varying transient voltage and current acting on the grounding body, respectively. G i , L i ,...

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Abstract

The invention discloses a transient-state grounding body modeling method, which belongs to a more-accurate theoretical calculation method for forming a grounding device of a transformer substation by means of the electromagnetic theory. A grounding body is equivalent to a uniform cylinder with the length of 1 and the radius of a, the cylinder is equally divided into N sectional conductors identical in size, and the grounding body is considered as N distribution parameter LCG (linear congruential generator) transmission line circuits which are connected in series sectionally on the condition of ignoring self resistance and self impedance of the conductors. The invention further discloses a calculating formula of ground conductivity, self inductance and ground capacity of a sectional conductor. No matter for a horizontal grounding body or vertical grounding body, impact voltage rise of an injection point, calculated by the method, is matched with experimental results and meets the transient-state calculation of a grounding grid under the action of impulse current.

Description

technical field [0001] The invention relates to a system model for simulating a grounding device in a power system transmission line and a substation lightning protection system, in particular to a more accurate theoretical calculation method for establishing a substation grounding device by using electromagnetic embedding theory. Background technique [0002] The grounding body is the basic part of the grounding system, and is widely used in the lightning protection of power system transmission lines and substations. In the system, there are not only steady-state or quasi-steady currents such as DC and power frequency currents, but also lightning currents with equivalent frequencies as high as several megabytes to tens of megabytes through the grounding device. Therefore, the existing grounding device The modeling analysis is carried out by equivalent resistance substitution. [0003] Since the above equivalent resistance method does not consider the influence of inductanc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杨琳李建明刘平
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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