地面损失对估计闪电诱导电压的影响,具有分散性土壤参数
Toqa Faisal1,2, Sahar S Kaddah3, Taghreed Said4
1Electrical Power and Machines Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt. toqafaisal24@gmail.com.
Scientific reports
|July 6, 2025
概括
地面损失对配电线路的闪电诱导电压产生重大影响,特别是在较低的速度和更高的线路高度. 对这些损失的核算对于在闪电事件期间改善线路性能至关重要.
科学领域:
- 电气工程 电气工程
- 电磁学 电磁学 电磁学 电磁学
- 电力系统 电力系统
背景情况:
- 闪电袭击对空中配电线路构成重大威胁.
- 了解闪电引起的电压 (LIV) 对于确保线路的可靠性和性能至关重要.
- 输电线路模型中的地面损失对LIV具有显著但复杂的影响.
研究的目的:
- 研究地面损失对空中配电线路中闪电诱导电压 (LIV) 的影响.
- 分析土壤特征 (固定型与频率依赖型) 如何影响LIV.
- 评估不同闪电速度,输电线路高度和距离对地面损失的意义的影响.
主要方法:
- 利用分析方法研究闪电引起的电压.
- 使用Cooray-Rubinstein模型考虑有限的地面导电性计算的闪电电磁场.
- 使用Agrawal合模型计算频域中的闪电诱导电压.
主要成果:
- 地面损失显著影响LIV,在较低速度 (例如40m/μs) 上对峰值的影响更为显著.
- 在中点较高的输电线路高度 (10 m) 上,地面损失的影响更大,但在距离中点较远的较低高度时会增加.
- 在距离闪电通道100米或更远的地方,地面损失的影响会减少;依赖频率的土壤模型会比固定模型更低的LIV值.
结论:
- 地面损失在确定空中配电线上的闪电诱导电压大小方面发挥着至关重要的作用.
- 地面损失的影响取决于速度,在较低的闪电速度时更明显.
- 传输线高度和距离闪电通道的距离改变了地面损失的意义,依赖频率的土壤模型提供了更细致的表示.
相关概念视频
Lossy Lines and Overvoltages
135
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
135
Boundary Conditions: Lossless Lines
158
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
158
Determining Electric Field From Electric Potential
4.6K
The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
4.6K
Line Loss
303
The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
303
Electrostatic Boundary Conditions in Dielectrics
1.4K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.4K
Susceptibility, Permittivity and Dielectric Constant
1.8K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
1.8K


