Fuse RW3-12 manufacturers wholesale sales outdoor high drop-out fuse | Обустройство дома

Fuse RW3-12 manufacturers wholesale sales outdoor high drop-out fuse | Обустройство дома

RW3-10/100A,RW3-10/200A,RW3-12/100A,RW3-12/200A,HRW3-10/100A,HRW3-10/200A,HRW3-12/100A,HRW3-12/200AOutdoor Drop-out fuse for6~10KVcommunicate with50HzDistribution lines and powertransformer, For short circuit protection.

RW3-12/100ADrop-out fuse Scope

The fuse is suitable for outdoor, altitude does not exceed1000Meters, the ambient temperature is not higher than40CEL or not less than-40CEL. Not available for indoor, there are serious corrosive gases or contains combustion, places explosive gases; does not apply there is severe vibration or shock.

RW3-12/100ADrop-out fuse structure Introduction

Dengrui electrical fuses are madeinsulator, Composed of the contact conductive systems and fuse tubes and other components. When working properly, the movable joints fuse fuse tube lock, it can fuse tube in the closing position. When the short-circuit current to fuse is blown, arcing in the fuse tube arc tube fuse tube under the action of the arc, producing large amounts of gas, when the short-circuit current zero, have a strong role to free the arc extinguishing , followed by the release of active joints, fuse tube in the upper and lower thrust static contact under its own weight and the role of the rapid fall, to form a clear isolation gap.

Drop-out fuse is installed

(1) The installation should melt tension (approximately the melt is pulled around 24.5N), otherwise easily lead to contact heat. (2) mounted on the cross arm fuses (architecture) on should be solid and reliable, can not have any shaking or shaking phenomenon. (3) melting tube should dip down to 25 . 2 ., and to facilitate the melt is blown fuse tube can quickly fall on their own weight. (4) fuses should be installed in the vertical distance from the ground not less than 4m cross arm (frame), and if installed above distribution transformers, should be kept horizontal distance of more than 0.5m and distribution transformer outermost boundary contour, prevent In case fuse tube drop caused by other accidents. Length (5) should be adjusted moderate melting tube, requires closing after more than two-thirds of the duckbill buckle tongue can contact length, in order to avoid self-falling malfunction in the operation, also non-melting tube top dead duckbill to prevent the melt blown fuse tube can not be after fall. (6) Melt use must be regular manufacturers of standard products, and has a certain mechanical strength, general requirements melt least able to withstand more pulling force 147N. (7) 10kV drop fuse installed outdoors, the requirements phase distance greater than 70cm.

Drop-out fuse operation

Under normal circumstances do not allow operating with load drop-out fuse, only allows its operation load devices (lines). But in the rural power network 10kV distribution lines branch lines and the rated capacity of less than 200kVA distribution transformer allows operation with a load according to the following requirements: (1) operations carried out by two (one care, one person operation), but must be worn by the test pass insulated gloves, wear insulated boots, wearing goggles, use a voltage rating that matches qualified insulation rod operation, disable operating at lightning or heavy rain climate. (2) When wind up the operation, the general provisions for the first pull off the intermediate phase, and then pull the leeward side of the phase, the final phase pull off the windward side. This is because the three-phase distribution transformers to run a two-phase operation, pull off the arc sparks generated intermediate phase minimum, without causing phase short circuit. Second is to pull off the leeward side of the phase, because intermediate phase has been opened, the leeward side of the phase to phase windward edge distance doubling, even with over-voltage generated, resulting in the possibility of phase short circuit is small. Finally, with time to pull off the windward side, only to ground capacitance current, already very slight spark generated. (3) when the closing operation sequence wind up contrary, the first combined phase windward side, and then close the leeward side of the phase, and finally close the intermediate phase. (4) Operating melting tube is a frequent project, attention will not cause contact burns caused by poor contact, the contacts overheating, spring annealing, prompting more bad contacts the contact, creating a vicious cycle. So, pull, when combined melting tube to force moderate, after Hao, carefully check the duckbill tongue can closely link more than two-thirds the length of the tongue, can wind up hooked on the lever few downward pressure duckbill, then gently pull test, check whether Hao. Closing time failed to put in place or close securely, insufficient contact pressure on the fuse quiet, can easily cause contact burns or fuse tube drop on their own.