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High elevation correction method for ultra-high voltage and ultra-high voltage line air insulation clearance

An air-insulated, extra-high voltage technology used in the spatial arrangement/configuration of cables, electrical components, overhead installations, etc.

Active Publication Date: 2008-09-17
STATE GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the altitude correction of high-altitude insulation coordination in my country is based on the altitude correction factor specified in GB-311.1-97, that is, Ka=1 / (1.1-H / 10000), but whether it can be used for 1000kV in high-altitude areas in my country The altitude correction of the voltage level needs further verification
The altitude correction method stipulated in Article 4.2.2 of IEC60071-2-1996 is only applicable to the altitude correction of 2000 meters and below

Method used

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  • High elevation correction method for ultra-high voltage and ultra-high voltage line air insulation clearance
  • High elevation correction method for ultra-high voltage and ultra-high voltage line air insulation clearance
  • High elevation correction method for ultra-high voltage and ultra-high voltage line air insulation clearance

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Embodiment Construction

[0032] specific implementation

[0033] When using the high-altitude correction method for air insulation gaps of UHV and EHV lines of the present invention, the following steps are included:

[0034] (1) Analyze the electrode type of the test for the correction object, and clarify that this method is applicable to the discharge between the wire and the frame, that is, for the line wire to the tower;

[0035] (2) Select the type of discharge voltage, including power frequency, operating wave and lightning wave;

[0036] (3) Determine whether the altitude range of the discharge voltage correction is within the altitude range involved in the method;

[0037] (4) According to the discharge voltage type and discharge voltage value U cw Determines the correction factor m for the altitude correction factor.

[0038] The specific values ​​are as follows:

[0039] Power frequency and lightning impact: m=1

[0040] Operating shock: m=1 (U<0.838)

[0041] m=1.803-0...

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Abstract

The present invention provides a high altitude correction method of uhv and ultra high voltage transmission line insulation gap, characterized in: (1) adopting the discharge correction formula, wherein, Ka means altitude correction factor of the voltage type; m means correction factor of the altitude correction factor of the voltage type; H means altitude, 23m cw, the specific value as following: power frequency and lightning impulse:m=1; switching impulse:m=1 (U<0.838); m=1.803-0.9587 U(0.8381.568), U means switching impulse voltage, unit MV. The method is widely applied in multiple transmission and transformation engineering insulation design.

Description

technical field [0001] The invention relates to the field of external insulation of power system transmission lines, and is mainly aimed at a correction method for the air insulation gap between line conductors and towers in the design of external insulation of ultra-high voltage and ultra-high voltage transmission lines in high-altitude areas. Background technique [0002] The external insulation strength of the line is the basic condition to ensure the normal operation of the line, and the quality of the external insulation design is an important indicator for evaluating the quality of the line design. Lines of different voltage levels have different choices of air gaps, numbers and types of insulators according to their maximum operating voltage. Insufficient air insulation gaps or insufficient number of insulators will lead to flashover accidents during the operation of the line, resulting in the action of relay protection devices and system instability. resident life. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G7/20H02G7/00
Inventor 万启发陈勇霍锋谷莉莉许中胡伟谢梁孟刚曹晶谢雄杰
Owner STATE GRID ELECTRIC POWER RES INST