Progressive step-by-step discharge device
A discharge device and progressive technology, applied in the field of progressive discharge devices, can solve the problems of line tripping, long time, and high induced voltage.
Pending Publication Date: 2018-02-09
上海兆邦电力器材有限公司
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Problems solved by technology
However, lightning protection insulators cannot completely eliminate power frequency freewheeling caused by lightning arcs.
In some cases, for example, the lightning induced voltage is relatively high, and the induced voltage on the overhead line cannot be reduced to a level below the level that may trigger the secondary lightning arc again through an arc strike discharge, or the grounding insulation performance of the pole is not good
In these cases, power frequency freewheeling may last for a relatively long time, thus causing line tripping
Method used
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Embodiment Construction
[0024] Discharge chamber 1 made of round tube insulating material ( figure 1 ), a series of steel balls are embedded equidistantly on the helix around the axis on its side as transition electrodes 2 ( figure 1 ).
[0025] The selection of the inner diameter R of the discharge chamber is determined by the number n of steel balls placed on a spiral line, the spacing d of steel balls and the radius r of steel balls, R>4r, r>d. The radius r of the steel ball is not greater than the wall thickness h of the discharge chamber, r<h.
[0026] The selection of the length L of the discharge chamber and the total number N of steel balls is determined by the line voltage level and lightning protection level. The sum of the distances between steel balls Σd is not less than the gap required for air breakdown of power frequency withstand voltage for 1min, and not greater than the gap required for air breakdown of lightning strike withstand voltage. In the case of equal spacing between stee...
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The invention discloses a progressive step-by-step discharge device. When the progressive step-by-step discharge device is matched with a lightning protection insulator or a lightning protection insulator strain clamp (string) with a discharge gap, a power frequency arc triggered by thunder and lightning can be quickly extinguished in a lightning stroke, a line is prevented from being damaged by the lightning stroke and the lightning trip-out frequency is eliminated or reduced. The progressive step-by-step discharge device comprises a discharge cabin made of a solid insulating material, two metal main electrodes and N (N is greater than or equal to 2) metal transition electrodes, wherein the transition electrodes are arranged in the discharge cabin along the inner wall. The space between any two adjacent electrodes (including the main electrodes and the transition electrodes) is never greater than the linear distances between any electrode in the two electrodes and any other electrodesexcept for the adjacent electrode; and discharge between the two main electrodes is completed through progressive step-by-step secondary series discharge between the main electrodes and the N transition electrodes. When any level of secondary discharge is cut off, discharge between the two main electrodes is terminated.
Description
technical field [0001] The invention discloses a progressive discharge device step by step. When the progressive step-by-step discharge device is used together with the anti-insulator or lightning-proof insulator tension clamp (string) with discharge gap, it can quickly extinguish the power-frequency arc caused by lightning when struck by lightning, and protect the circuit from lightning strike damage and reduce the number of lightning trips. Background technique [0002] Among the various factors that affect the safety of power transmission and distribution, lightning strikes cause the most serious damage to power transmission and distribution overhead lines. This kind of damage is specifically manifested as 1) lightning arc and subsequent power frequency arc directly blow off the transmission and distribution wires or destroy insulators, and 2) power frequency freewheeling caused by lightning causes line tripping. For a long time, lightning protection technology has been...
Claims
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Login to View More IPC IPC(8): H01B17/46
CPCH01B17/46
Inventor 王哲斐王臻王明邦应必光胡根富吴兴武
Owner 上海兆邦电力器材有限公司