CN201252066Y - 24 kV outdoor high-voltage alternating current injection falling type fuse - Google Patents

Abstract

The utility model discloses a 24 kV outdoor high-voltage alternating current injection falling type fuse used for interrupting current under the grade of 24 kV voltage, which comprises a fusion tube, an upper movable contact, a lower movable contact, an upper stationary contact, a lower stationary contact and a pillar insulator; the upper part of the fusion tube is the upper movable contact, the upper stationary contact is contacted and connected with the upper movable contact, and an upper wiring terminal is fixed on the upper stationary contact; the pillar insulator is arranged parallel to the fusion tube, the upper end and the lower end of the pillar insulator are respectively fixed with the upper stationary contact and the lower stationary contact, and an installation plate is fixed in the middle of the pillar insulator; an auxiliary arc extinguishment pipe is arranged in the fusion tube; contact between the lower movable contact and the lower stationary contact of the fusion tube adopts two-stage contact double electricity conduction. The utility model can ensure reliable current interrupt under the grade of 24 kV voltage to optimize a power transformation and transportation voltage reduction program, thereby investment on power transformation and transportation line establishment can be saved, and line loss in the operation is lowered; particularly the phenomena of the prior fuse of high-temperature melt, damage and scrapping of the lower movable contact and the lower stationary contact caused by poor contact between the movable contacts and the stationary contacts are overcome.

Description

The 24kV outdoor high-voltage alternating current sprays fuse switch

Technical field

The utility model relates to the electric protection device technical field, specifically relates to a kind of 24kV outdoor high-voltage alternating current and sprays fuse switch

Background technology

Fuse is used as overload and short-circuit protection in power transmission and transformation system; The outdoor high-voltage alternating current injection fuse switch of China's use does not at present still have the 24kV electric pressure, and the 24kV electric pressure is the most frequently used supply power voltage of power transmission and transformation system in the world, same transmission line, the electric scope of sending of 10kV electric pressure is 40% of 20kV electric pressure approximately; Because the power transmission and transformation electrical voltage system can drop to 24kV from 110kV, directly is depressured to low pressure by 24kV again and uses for the user; Step-down program than present domestic routine, drop to 40.5kV from 110kV, drop to 12kV again, being depressured to low pressure at last uses for the user, the situation that the step-down process is loaded down with trivial details has remarkable advantage, not only can reduce the equipment input of an electric pressure, and the line loss 65-70% that when the electric energy of the same capacity of dispensing, can descend; But spray fuse switch and can not indiscriminately imitate former 12kV grade owing to manufacture and design the 24kV outdoor high-voltage alternating current, need otherwise designed, so this product of domestic use still relies on import so far.

Summary of the invention

The purpose of this utility model is in order to overcome the deficiency of above-mentioned prior art, to provide a kind of 24kV outdoor high-voltage alternating current to spray fuse switch, to optimize power transmission and transformation step-down program, makes the construction power transmission and transformation line can save input, reduction line loss in service.

For achieving the above object, the technical solution adopted in the utility model is such: a kind of 24kV outdoor high-voltage alternating current sprays fuse switch, comprise fusion tube, dynamic/static contact up and down, post insulator, it is characterized in that, be furnished with auxiliary blow-out pipe in said fusion tube, when fuse during at drop-out current, auxiliary blow-out pipe produces a large amount of gases, electric arc is directly discharged from the fusion tube lower end automatically with gas, guarantees that drop-out current is reliable; In order to improve the contact conduction between dynamic/static contact, the contact dual conduction that adopt two-stage contact of the lower moving contact of fusion tube with following fixed contact, wherein one-level is to descend the circular-arc contact of fixed contact and lower moving contact directly to contact, be provided with torsion spring between fixed contact and the lower moving contact down, utilize the elastic force of torsion spring will descend fixed contact and lower moving contact to compress, reach the favorable conductive purpose; Another grade is that down fixed contact contacts with cam surface on the lower moving contact by conducting strip provided thereon, establishes steel spring plate between conducting strip and the lower moving contact, utilizes the clamping force of steel spring plate to reach the favorable conductive purpose; By two-stage stack effect simultaneously, to guarantee the security performance of fuse.

Owing to adopted technique scheme, a kind of 24kV outdoor high-voltage alternating current of the present utility model sprays fuse switch, can guarantee that drop-out current is reliable under the 24kV electric pressure, to optimize power transmission and transformation step-down program, make the construction power transmission and transformation line can save input, reduction line loss in service; Especially lower moving contact and following fixed contact contact the dual conduction that adopts the two-stage contact, the fuse before having overcome is because of the lower moving contact that occurs bad contact between dynamic/static contact and cause and the high temperature melting of following fixed contact, the phenomenon that damage is scrapped.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1, upper connecting terminal, 2, go up moving contact, 3, upper static contact, 4, fusion tube, 5, lower moving contact, 6, fixed contact down, 7, conducting strip, 8, lower connecting terminal, 9, mounting panel, 10, post insulator.

Embodiment

By shown in Figure 1, a kind of 24kV outdoor high-voltage alternating current of the present utility model sprays fuse switch, comprises fusion tube 4, dynamic/static contact up and down, post insulator 10; Said fusion tube 4 tops are to go up moving contact 2, contact connection upper static contact 3 on the last moving contact, fixing upper connecting terminal 1 on the fixed contact 3; Said post insulator 10 be arranged in parallel with fusion tube 4, and fixed contact 7 was fixing under the post insulator upper and lower side reached with upper static contact 3 respectively, was fixed with lower connecting terminal 8 on the following fixed contact 7, was fixed with mounting panel 9 at the post insulator middle part; It is characterized in that being furnished with auxiliary blow-out pipe in said fusion tube 4, when fuse during at drop-out current, auxiliary blow-out pipe produces a large amount of gases, and electric arc is directly discharged from the fusion tube lower end automatically with gas, guarantees that drop-out current is reliable; In order to improve the contact conduction between dynamic/static contact, the contact dual conduction that adopt two-stage contact of the lower moving contact 5 of fusion tube 4 with following fixed contact 6, wherein one-level is to descend the circular-arc contact of fixed contact 6 and lower moving contact 5 directly to contact, be provided with torsion spring between fixed contact and the lower moving contact down, utilize the elastic force of torsion spring will descend fixed contact and lower moving contact to compress, reach the favorable conductive purpose; Another grade is that down fixed contact 6 contacts with cam surface on the lower moving contact 5 by conducting strip 7 provided thereon, establishes steel spring plate between conducting strip and the lower moving contact, utilizes the clamping force of steel spring plate to reach the favorable conductive purpose; By two-stage stack effect simultaneously, to guarantee the security performance of fuse.

Claims (1)

1, a kind of 24kV outdoor high-voltage alternating current sprays fuse switch, comprises fusion tube (4), dynamic/static contact up and down, post insulator (10); Said fusion tube (4) top is to go up moving contact (2), and contact connects upper static contact (3) on the last moving contact (2), and upper static contact (3) is gone up fixedly upper connecting terminal (1); Said post insulator (10) be arranged in parallel with fusion tube (4), fixed contact (7) was fixing under the post insulator upper and lower side reached with upper static contact (3) respectively, be fixed with lower connecting terminal (8) on the following fixed contact (7), be fixed with mounting panel (9) at the post insulator middle part, it is characterized in that: in said fusion tube (4), be furnished with auxiliary blow-out pipe; The lower moving contact (5) of fusion tube (4) and following fixed contact (6) contact the dual conduction that adopts the two-stage contact, wherein one-level is that the circular-arc contact of fixed contact (6) and lower moving contact (5) down directly contacts, and is being provided with torsion spring between fixed contact and the lower moving contact down; Another level is that down fixed contact (6) contacts with cam surface on the lower moving contact (5) by conducting strip (7) provided thereon, establishes steel spring plate between conducting strip and the lower moving contact.

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