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Damping bus for suppressing VFTO

A busbar and damping technology, applied in the control field of power grid operation, can solve the problems of high failure rate, damage and crash of electronic transformers, and achieve the effects of improving work reliability, reducing accident rate and good compatibility.

Active Publication Date: 2017-03-08
CHINA ELECTRIC POWER RES INST +3
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AI Technical Summary

Problems solved by technology

As one of the characteristics of the primary equipment of the smart grid, the failure rate of the electronic transformer is also very high, and it often occurs in the secondary system, including the front circuit, the acquisition card and the data processing unit, resulting in crash, garbled code or damage

Method used

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  • Damping bus for suppressing VFTO
  • Damping bus for suppressing VFTO
  • Damping bus for suppressing VFTO

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0030] The principle of VFTO generation can be used figure 1 Give a brief description. There are two sections of bus in GIS, the wave impedance is Z 1 and Z 2 , respectively charged G 1 and G 2 , when switch k is closed, the charge G 1 and G 2 To be reassigned on the bus. Due to the good insulation performance in the GIS, the energy loss is very weak during the charge redistribution process of the busbar, and the traveling wave is refracted and reflected at both ends of the busbar to form a VFTO with a high amplitude and a frequency of 5 to 40MHz.

[0031] In GIS, the wave impedance of a section of bus is changed in the form of damping bus, that is, the form of inductance L paralleled with damping resistor R. The traveling wave forms a higher voltage in the residual inductance section, and the damping resistors at both ends absorb the tra...

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Abstract

The invention provides a damping bus for suppressing VFTO. A helical tube type damping bus capable of consuming electron flow energy is adopted, a conductive tube of the damping bus bar is made to be a spiral tube with a spiral groove structure. The damping bus is advantageous in that, VFTO formed in GIS can be suppressed, the amplitude and frequency are greatly introduced, starting from a primary device, work reliability of a secondary system of an electronic transformer and other state monitoring devices used for GIS is improved, accident rate is reduced, and establishment of an intelligent substation with the electronic transformer as the representative is promoted. Via the mode of changing the wave impedance of the bus, the bus power loss is increased, and the development of traveling waves is suppressed, thereby achieving the purposes of reducing the VFTO amplitude, and reducing the VFTO frequency. The technical scheme is suitable for reconstruction of a current GIS pipeline, and is suitable for a novel GIS pipeline.

Description

technical field [0001] The invention relates to a control method for grid operation, in particular to a damping bus for suppressing VFTO. Background technique [0002] Gas-insulated combined electrical appliances (GIS) have good internal insulation performance, and the bus has no corona loss and the loss is small. When the isolating switch is operated, the residual charge on the bus is easy to form a refraction traveling wave. This traveling wave, with high amplitude and frequency, is called fast steep overvoltage (VFTO). The upper limit frequency of VFTO can reach 5MHz to 40MHz, which will cause harm to GIS internal insulation supports, basin insulators and other components, especially to transformers and reactors connected to GIS through oil and gas bushings. The relative insulation level of primary equipment is low, and the higher the GIS voltage level, the higher the risk of various hazards caused by the existence of VFTO. [0003] VFTO not only harms the primary equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H01B5/06
Inventor 王晓琪王均梅汪本进王欢吴士普王磊
Owner CHINA ELECTRIC POWER RES INST
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