220 kV Transmission Line Insulator String Anti-icing Flash Checking Method
A technology for insulator strings and transmission lines, applied in the direction of testing dielectric strength, etc., can solve the problems of line ice flash, different quality, and accuracy problems of insulator strings, so as to reduce the probability of ice flash, reduce accuracy problems, The effect of improving accuracy
Active Publication Date: 2019-08-27
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
However, due to the lack of scientific judgment methods, when formulating the maintenance plan, the technicians of the team often determine which insulator strings need to be included in the anti-icing flashover and creepage adjustment plan based on experience, and the quality of the team's technicians is different, which leads to the inclusion of anti-icing flashover. There is a problem with the accuracy of the insulator string in the creep plan, which affects the accuracy of the subsequent insulator anti-icing flash adjustment and increases the probability of ice flash on the line after maintenance
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Embodiment 1
[0017] First, establish an insulator anti-icing flashover expert database, which is used to store the required values of dry arc distances that meet the anti-icing flashover requirements corresponding to various levels of pollution areas, ice areas, and insulator string combinations; among them, the required values of dry arc distances The determination method is: in the superimposed area of the c-level polluted area and the heavy ice area, the required value of the dry arc distance of the hanging I string without interleaving is used as the base, and the interpolation of large and small umbrellas (such as "3+1" interpolation) is used. The required value of the dry arc distance of the suspended I string is reduced by 10% relative to the base number; the required value of the dry arc distance of the suspended II string arranged without interleaving is increased by 10% relative to the base, and the dry arc distance of the suspended II string arranged with large and small umb...
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The invention discloses a 220 kV power transmission line insulator string anti-icing flash checking method, which comprises the following steps: Step 1. Establishing an insulator anti-icing flash expert database for storing various polluted area levels, ice area levels, and insulator strings The required value of the dry arc distance that meets the anti-icing flashover requirements corresponding to the type combination mode; step 2, first read in the insulator anti-icing flashing expert database according to the string type of the tower insulator to be checked, the level of pollution area and the level of ice area where it is located. Take the required value of the dry arc distance under the corresponding conditions, and then compare and check the string length of the tower insulator to be checked with the required value of the dry arc distance. The invention can effectively improve the accuracy of insulator anti-icing flash check, thereby improving the accuracy of subsequent insulator anti-icing flash adjustment and reducing the probability of ice flash occurring on lines after maintenance.
Description
technical field [0001] The invention belongs to the technical field of electric power engineering, and in particular relates to an anti-icing flashover checking method for insulator strings of 220 kilovolt transmission lines. Background technique [0002] Icing flashover of overhead transmission line insulators is one of the main reasons affecting the safe and stable operation of the power grid. Therefore, it is one of the important maintenance tasks of the power supply department to treat the external insulation of the old lines with low anti-icing flash level. However, due to the lack of scientific judgment methods, when formulating the maintenance plan, the team technicians often determine which insulator strings need to be included in the anti-icing flashover and creep adjustment plan based on experience, and the quality of the team's technicians is different, which leads to the inclusion of anti-icing flashover adjustment. There is a problem with the accuracy of the in...
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IPC IPC(8): G01R31/12
Inventor 巢亚锋
Owner STATE GRID HUNAN ELECTRIC POWER