Anti-aging protective device of lightning arrester and with impedance alterable
A protection device and arrester technology, applied in the field of arresters, can solve the problems of delayed aging arrester processing, fire, system safety hazards, etc., and achieve the effects of reducing the probability of explosion, delaying the aging process, and reducing the charging rate.
Inactive Publication Date: 2013-08-28
安徽通辰电气有限公司
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Problems solved by technology
The heat released by a varistor at the end of its life can be transferred to surrounding equipment and materials, which can cause serious fire and / or short circuit hazards
[0005] Once the arrester ages during operation, it will bring potential safety hazards to the system, and it needs to be replaced in time to avoid explosion accidents. The processing of aging arresters makes hidden dangers unable to be eliminated in time, and many systems have similar problems
Method used
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[0019] see figure 1 , the protection device is connected in series with the grounding terminal of the protected lightning arrester, that is, the protected lightning arrester is grounded through the grounding terminal 13 through the present invention. The device includes a casing 10, an insulating adapter 3, an increasing resistance 8, a rheostat switch 9, a rheostat controller 12, and the insulating adapter 3 is a connecting seat for the protected lightning arrester to be connected, and plays the role of sealing and insulating; The increased resistance impedance 8 adopts a part of the standard applicable arrester, which is equivalent to about 20% of the standard residual voltage of the arrester to be protected. The rheostat switch 9 adopts a contactor whose insulation level is compatible with the maximum voltage drop that the increasing resistance 8 bears, and is used in parallel with the increasing resistance 8 to control the connection or disconnection between the increasing...
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The invention relates to the field of lightning arresters, in particular to an anti-aging protective device of a lightning arrester and with impedance alterable. The anti-aging protective device of the lightning arrester and with the impedance alterable comprises an insulation adapter, an impedance increasing impedor, an impedance changing switch and an impedance changing controller, wherein the lighting arrester to be protected is connected to the insulation adapter and then is connected to a cable through a binding post, a conducting bar and a conducting post and finally is connected to an upper connecting bar through a conducting rod, the impedance increasing impedor and the impedance changing switch are connected between the upper connecting bar and a lower connecting bar in parallel, and the lower connecting bar is connected to the ground through the impedance changing controller. According to the anti-aging protective device of the lightning arrester and with the impedance alterable, the lighting arrester aging online detection technique which is quite mature at present is adopted, the chargeability of the lighting arrester to be protected is reduced with the impedance automatic-changing method, the aging process of an aged lighting arrester can be delayed, time for maintaining is gained for sites, especially unattended sites or complicated sites, and the probability of explosion of lighting arresters is reduced.
Description
technical field [0001] The invention relates to the field of lightning arresters, in particular to a variable impedance lightning arrester anti-aging protection device. Background technique [0002] Surge arresters are used to direct default currents (specifically, lightning currents) to ground and limit induced overvoltages to a level matching the capacity of equipment or materials connected downstream of the protective device. For this reason, arresters are usually connected between the phase that supplies the protected equipment and ground. [0003] Known lightning arresters have at least one varistor implemented as an overvoltage protection component, ie an electrical component whose resistance (or impedance) value varies significantly depending on the voltage applied to its electrodes. Specifically, a varistor has a very high resistance (or impedance) until the voltage at its electrodes reaches a threshold, beyond which the impedance drops significantly. Therefore, i...
Claims
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Login to View More IPC IPC(8): H02H9/00H02H9/04G01R31/00
Inventor 茅东刘克晓郭爱生
Owner 安徽通辰电气有限公司