CN201402778Y

CN201402778Y - Novel outdoor high-voltage drop-out fuse

Info

Publication number: CN201402778Y
Application number: CN2008201846794U
Authority: CN
Inventors: 陆敏强; 彭伯明
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-14
Filing date: 2008-12-31
Publication date: 2010-02-10
Anticipated expiration: 2018-12-31

Abstract

The utility model relates to a novel outdoor high-voltage drop-out fuse, which comprises a fuse holder, a fuse carrier and a lever mechanism, wherein a locking device is arranged on the fuse holder through a locking shaft pin and consists of a locking plate and a locking plate spring plate, and the locking plate is fixedly connected with the locking plate spring plate; a locking shaft pin hole isarranged on the locking plate, and the lever mechanism is fixed on the fuse carrier through a lever shaft pin; and the locking device increases and releases the pressure of a contact between the fuseholder and the fuse carrier through the lever mechanism. When the short circuit fault occurs in a system, the fuse carrier firstly completes breaking and extinguishes arc current, the locking device ensures that fusion welding does not occur in the product, and the fuse carrier reliably drops out. The utility model increases the application scope of the fuse, ensures the operation quality of the overhead distribution network, and provides the most basic short-circuit protection product for 10kV overhead lines in China; and the breaking capacity is up to 16kA, so the power supply reliability isimproved.

Description

A kind of novel outdoor high-voltage drop type fuse

Technical field

The utility model relates to a kind of fuse, particularly a kind of novel outdoor high-voltage drop type fuse.

Background technology

Fuse is a kind of protection equipment that the protection electric equipment was avoided the short circuit infringement.Its operation principle is when line short or overload, melt in the fuse fusing carrier is melted formation electric arc, and at the drop-down long arc of the effect of elastic body, high arc temperature makes the inner aerogenesis medium of fusing carrier resolve into gas simultaneously, in the fusing carrier pipe, set up very high pressure, free metal gas bleed pipe is made arc extinction outward, thereby cut-off short circuit current, fusing carrier falls under the effect of deadweight automatically simultaneously, forms a visible isolation fracture.The history in existing more than 50 year of the development of China's fuse switch, in early days based on imitative Soviet Union product, the mid-1970s has improved many products from grinding, because of product material and design level are limit, manufacture level improves little, the later stage eighties increases along with introducing with exchange of technology, and product has had tremendous development, has possessed world standard substantially.Because the short circuit interruption ability of fuse improves constantly and good and economic, now accepted and be extensive use of by vast power consumer, nearly 2,000,000 of annual demand.

In recent years along with economic development, growing industrial and agricultural development needs and living standards of the people improve constantly, and the demand of electric energy is multiplied, and the transmission capacity of current China electrical network is deficiency obviously, the phenomenon of power cuts to limit consumption happens occasionally, and is therefore imperative to the further increase-volume of electrical network.Yet along with having produced a new problem after the electrical network increase-volume again, the capacity of short circuit of 10kV circuit also improves thereupon and has reached 16kA, but has only 8～12.5kA as the connecting-disconnecting function of traditional fuse, can not be as the protection product of the best.Therefore power department has adopted circuit breaker to substitute as part, can significantly improve power supply reliability, dwindles the power failure area in the certain limit, has reduced the possibility of device damage.Its defective is that economy is relatively poor, is generally tens of times price of traditional fuse.The signal of tradition outdoor high-voltage drop type fuse is shown in Figure 3.

The utility model content

The purpose of this utility model is to provide a kind of connecting-disconnecting function to reach 16kA for the deficiency that solves above-mentioned technology and can guarantee that still the melting welding phenomenon does not take place fuse when above in interrupting process, guarantee reliably falling of fusing carrier, improve the novel outdoor high-voltage drop type fuse of power supply reliability.

In order to achieve the above object, a kind of novel outdoor high-voltage drop type fuse that the utility model is designed, it comprises fuse base, fusing carrier and leverage, it is characterized in that on fuse base, being provided with locking device by the locking pivot pin, locking device is made up of latch and latch shell fragment, latch is fixedlyed connected with the latch shell fragment, on latch, be provided with the lock shaft pin-and-hole, leverage is fixed on the fusing carrier by a lever pivot pin, and locking device is realized the pressure of contact between fuse base and the fusing carrier is increased and release by leverage.For guaranteeing when fusing carrier 3 cut-offs enough big downward jet power to be arranged, described fusing carrier, to 18 millimeters scopes of φ, the melt position is 1/3 to 1/2 position far from the lower end 14 millimeters of φ for its tube wall internal diameter.

The utility model is according to the working mechanism of expulsion fuse, fusing carrier is as the core component that cut-offs short circuit current, because connecting-disconnecting function reaches big 2～3 times that its structural strength of fuse of 16kA should be than 12.5kA, when implementing, can carry out structural reinforcing to fuse base, material and more rational design make inserts on the fuse base, upper bracket, the intensity of critical components such as touch base is strengthened down by adjusting, and fuse base does not deform in the assurance interrupting process.On fuse base, install simultaneously a cover locking device additional, and make the operating state of fuse that enough contact pressures can be arranged by the leverage that the utility model provides, melting welding does not take place between fuse base and the fusing carrier when guaranteeing to cut-off the 16kA short circuit current, influence is fallen, and is closing, do not needing too big operating physical force in the separating brake process.

A kind of novel outdoor high-voltage drop type fuse that the utility model provides, in making process, locking device is in relaxed state, this moment fusing carrier just can slip under the very little operating physical force fuse base on touch base, when closing a floodgate certain position, leverage contacts with locking device, and leverage promotes locking device and progressively presses touch base down in LAP subsequently, up to closing position.When closing position, product is in normal operating condition, this moment, locking device played the reduction contact resistance, reduce the heating and the loss of product, in the separating brake process, locking device release pressure under the effect of leverage at first, fusing carrier this moment touch base on just can fuse base under the very little operating physical force skids off, and finishes separating brake.When short trouble appearred in system, fusing carrier was at first finished and is cut-off, and extinguish arcs electric current, locking device guarantee that melting welding does not take place product, and other structural member guarantees that product does not deform, and fusing carrier reliably falls.It has improved the range of application of fuse, guarantees the running quality of overhead distribution net.For China's 10kV overhead transmission line provides the most basic short-circuit protection product, connecting-disconnecting function reaches 16kA, has improved power supply reliability.

Description of drawings

Fig. 1 is the combined floodgate operating state of the utility model embodiment;

Fig. 2 is the locking device structure schematic diagram;

Fig. 3 is traditional outdoor high-voltage drop type fuse structural representation.

Wherein: fuse base 1, locking device 2, fusing carrier 3, leverage 4, locking pivot pin 5, lever pivot pin 6, last touch base 7, latch 21, latch shell fragment 22, lock shaft pin-and-hole 23.

Embodiment

The utility model will be further described in conjunction with the accompanying drawings below by embodiment.

Embodiment:

As Fig. 1, shown in Figure 2, a kind of novel outdoor high-voltage drop type fuse that present embodiment provides, it comprises fuse base 1, fusing carrier 3 and leverage 4, it is characterized in that on fuse base 1, being provided with locking device 2 by locking pivot pin 5, locking device 2 is made up of latch 21 and latch shell fragment 22, latch 21 is fixedlyed connected with latch shell fragment 22, on latch 21, be provided with lock shaft pin-and-hole 23, leverage 4 is fixed on the fusing carrier 3 by a lever pivot pin 6, locking device 2 is realized the pressure of contact between fuse base 1 and the fusing carrier 3 is increased and release the fuse base 1 after leverage 4 and locking device 2 will assemble by leverage 4, fusing carrier 3 guarantees that contact is good on electric.

Enough big downward jet power is arranged when guaranteeing that fusing carrier 3 cut-offs, and to 18 millimeters scopes of φ, the melt position is 1/3 to 1/2 position far from the lower end 14 millimeters of φ for described fusing carrier 3 its tube wall internal diameters.

In making process, locking device 2 is in relaxed state, this moment fusing carrier 3 just can slip under the very little operating physical force fuse base 1 on touch base 7, when closing a floodgate certain position, leverage 4 contacts with locking device 2, leverage 4 promotes locking device 2 and progressively presses touch base 7 down in LAP subsequently, up to closing position.When closing position, product is in normal operating condition, this moment, locking device 2 played the reduction contact resistance, reduce the heating and the loss of product, in the separating brake process, locking device 2 release pressures under the effect of leverage 4 at first, fusing carrier 3 this moment touch base 7 on just can fuse base 1 under the very little operating physical force skids off, and finishes separating brake.When short trouble appearred in system, fusing carrier 3 was at first finished and is cut-off, and extinguish arcs electric current, locking device 2 guarantee that melting welding does not take place product, and other structural member of fuse base 1 guarantees that product does not deform, and fusing carrier 3 reliably falls.

Claims

1. novel outdoor high-voltage drop type fuse, it comprises fuse base (1), fusing carrier (3) and leverage (4), it is characterized in that upward being provided with locking device (2) by locking pivot pin (5) at fuse base (1), locking device (2) is made up of latch (21) and latch shell fragment (22), latch (21) is fixedlyed connected with latch shell fragment (22), on latch (21), be provided with lock shaft pin-and-hole (23), leverage (4) is fixed on the fusing carrier (3) by a lever pivot pin (6), and locking device (2) is realized the pressure of contact between fuse base (1) and the fusing carrier (3) is increased and release by leverage (4).

2. a kind of novel outdoor high-voltage drop type fuse according to claim 1 is characterized in that described fusing carrier (3), and to 18 millimeters scopes of Ф, the melt position is 1/3 to 1/2 position far from the lower end 14 millimeters of Ф for its tube wall internal diameter.