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Extra-high voltage transformer substation VFTO and shell transient potential conjoint analysis method

A joint analysis, substation technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as insufficient overall consideration, complex operation, and large errors

Inactive Publication Date: 2021-05-18
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the experiment requires expensive equipment and complicated operation
Relatively speaking, the method of using simulation software to simulate electromagnetic transients can more conveniently evaluate electromagnetic transient overvoltages. The existing simulation is limited to local analysis, with large errors and insufficient overall consideration.

Method used

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  • Extra-high voltage transformer substation VFTO and shell transient potential conjoint analysis method
  • Extra-high voltage transformer substation VFTO and shell transient potential conjoint analysis method
  • Extra-high voltage transformer substation VFTO and shell transient potential conjoint analysis method

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Embodiment Construction

[0027] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] Such as figure 1 As shown, the method of this embodiment is as follows.

[0029] The present invention provides a joint analysis method of VFTO and shell transient potential of UHV substation, comprising the following steps:

[0030] Step 1: Obtain the physical models of GIS substation transformers, bushings, isolating switches, grounding switches, circuit breakers, busbars, and shorting bars, and determine their parameters according to the actual project;

[0031] The open state of the circuit breaker in the substation is equivalent to a series capacitor; when it is closed, it is equivalent to a bus. Both the opening and closing of the isolating switch are equiv...

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Abstract

The invention provides an extra-high voltage transformer substation VFTO and shell transient potential conjoint analysis method, and relates to the technical field of power system over-voltage and protection. The method is applied to verification of design and arrangement schemes of ultra-high-voltage and extra-high-voltage gas-insulated metal-enclosed switches, the internal and external over-voltages of equipment are calculated and analyzed by using the method, the structure and parameters of the equipment can be further optimized, and in a GIS internal-external-grounding grid joint simulation model, VFTO and shell transient potential waveforms and amplitude-frequency characteristics at internal and external equipment can be measured, and an equipment scheme can be checked. The method is low in complexity, can be widely applied, and is high in electromagnetic transient software utilization efficiency, more accurate in simulation and more accurate in frequency characteristic.

Description

technical field [0001] The invention relates to the field of power system overvoltage and protection, in particular to a method for joint analysis of VFTO and housing transient potential of an ultra-high voltage substation. Background technique [0002] In the UHV GIS (Gas Insulated Substation) substation, when the disconnector is in operation, since the disconnector has no arc extinguishing device, a very high amplitude fast transient overvoltage (VFTO, Very Fast Transient Overvoltages) will be generated between the contact gaps. , when the VFTO propagates along the busbar to the connection between the GIS and the high-voltage bushing, due to the discontinuity of the wave impedance at the connection between the busbar and the bushing, the high-frequency transient voltage wave will be refracted and reflected here. The voltage wave of the reflected part returns along the original path, and the voltage wave of the refracted part is coupled between the GIS and the ground, causi...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 董沅慧李雁徐建源庚振新林莘郝莎厉伟刘佳佳许杰张显忠
Owner SHENYANG POLYTECHNIC UNIV
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