CN202034328U - Outdoor alternating-current high-voltage dropout fuse - Google Patents

Abstract

The utility model discloses an outdoor alternating-current high-voltage dropout fuse, comprising connecting terminals, a composite insulator, an upper static contact, a lower static contact, an upper movable contact, a lower movable contact and a fusion pipe, wherein the connecting terminal comprises an upper connecting terminal and a lower connecting terminal. The outdoor alternating-current high-voltage dropout fuse is characterized in that the upper static contact is directly connected with the upper connecting terminal; and a silicone rubber insulating layer is arranged on the external wall of the composite insulator. The outdoor alternating-current high-voltage dropout fuse has the advantages that an RW10 type structure is combined with an RW11 type structure; furthermore, the upper static contact is directly connected with the upper connecting terminal, and the silicone rubber insulating layer is arranged on the external wall of the composite insulator; therefore, the heating of contact heads at the upper end and the lower end can be avoided effectively when the load is heavier, and the fusion pipe can be ensured to drop quickly after the fusible wire is fused so as to form an obvious disconnection clearance and ensure the safe usage of the line.

Description

A kind of outdoor ac high voltage drop fuse

Technical field

The utility model has related to the short switch that uses in a kind of 10kV distribution line, particularly a kind of outdoor ac high voltage drop fuse.

Background technology

Fuse is the most frequently used a kind of protective switch of the short circuit of 10kV distribution line branch line and distribution transformer; it have economy, easy to operate, adapt to advantages such as the outdoor environment performance is strong, be widely used in 10kV distribution line and distribution transformer primary side as protection with carry out equipment and throw, cut and manipulate.It is installed on the 10kV distribution line branch line, can dwindle the power failure scope, because of it has a tangible cut-off point, has possessed the function of isolating switch, has created a safety work environment for maintenance section circuit and equipment, has increased maintainer's the sense of security.It is installed on the distribution transformer, can be used as the main protection of distribution transformer, so, in the 10kV distribution line and on the distribution transformer, obtained popularizing.Fuse can be divided into two kinds of indoor type and outdoor types.

Along with the continuous variation of the fuse scope of application and environment for use, there has been the fuse of multiple model to be applied in the middle of the varying environment at present, representative several model main features are described below:

1, RW3 type, the Vintage Product major defect that is commonly called as Duckbill type is:

(1) do not have the elater device, only depend on the elastic force of fusion tube deadweight and spring contact to fall, the arc time is long, and strong sometimes arc discharge can the top jumping circuit.

(2) easily water inlet of fusion tube upper end, the time has been grown and has caused the fuse oxidation corrosion easily broken, has increased non-artificial power failure probability.

(3) use the steel shell fragment on the early stage fixed contact, getting rusty easily fractures, and is not commonly called as " lighting a lamp " phenomenon owing to there being contact pressure to produce between contact then, is exactly the inner heating easily of lower moving contact hanging scroll place and top duckbilled; Night inspection often can be seen the rubescent even shinny phenomenon that produces because of loose contact.Increase line loss, and then burn fuse.

(4) the easy corrosion of duckbilled spring on top is followed the string, and causes mistake to fall.Especially shaken and easier misoperation under severe weather conditions.

2, RW7 type product major defect is:

(1) the easy corrosion of touch spring is followed the string down, causes loose contact, burns the semi-circular hanging scroll of lower moving contact.And hanging scroll is the design of hollow embedding lower moving contact, and it is bad to dispel the heat, and burns easily.

(2) the not auxiliary stressed positioner of the fixed contact on top, the elastic strength of crossing over upper static contact when closing fusion tube because of impulsive force, and then upwards distortion easily causes upper static contact that the pressure of fusion tube is reduced, and easily pitches.

(3) the contact fixed support is the slab design that the thick steel plate of 5mm is stamped to form up and down, on the magnet of circle, be difficult for fixing, easily about twisting.In case serious the maintenance with regard to needing to have a power failure of displacement distortion just can be used.

3, RW10 type product major defect is:

The RW10 type is the DianKeYuan design, nineteen ninety-five is obtained national science and technology progress third prize, this product structure is than several models are apparent slightly huge before, structure is than RW3 type, the RW7 type is more reasonable, in its structure, increased the fuse device for ejecting, pressure-relief valve structure has been adopted on cartridge fuse top, has successfully realized arc blow-out step by step, and operation principle is when the electric power system breaks down, fault current is with the fuse quick fuse, produce electric arc in fusion tube, fusion tube produces a large amount of gas under the effectiveness of electric arc, when gas surpasses given force value, the release of pressure sheet is promptly opened with the button head, alleviated the pressure in the cartridge fuse, when current over-zero, produced the strong free effectiveness of going, made arc extinction.And when gas was lower than given force value, the release of pressure sheet was failure to actuate, and what produce during current over-zero goes free gas from spout ejection down strongly, and pop-up board is pulled out the fuse buttock line fast, makes electric arc fast than the speed that RW3 type, RW7 type extinguish.Be not easy to be with arc to fall, be not easy to damage contact, after fuse melted down, turning joint was released, and under the pressure of cartridge fuse shell fragment under upper static contact, the effectiveness of dead weight is fallen fast in addition, with circuitry cuts, forms tangible breaking gap.Can also be furnished with elasticity auxiliary contact and arc-extinguish chamber with the fuse switch of little load disjunction, in order to a deciliter rated load electric current.Regrettably the RW10 type uses through reality and still exists the shortcoming of several aspects:

(1) connects with the multiply annealed copper wire between upper static contact and the upper connecting terminal, perhaps connect to avoid metal fatigue to fracture with thin multilayer copper sheet, and it is less than normal in actual the use because of contact area, it is many to connect material riveting point, the damage of easily generating heat of middle connection material, and after the copper material connection damages, electric current other contact portions of flowing through, the helical spring conduction of load current on fixed contact follows the string after the spring heating, burns until fuse.

(2) meet the big environment of load and generate heat easily because contact-making surface is less at lower moving contact hanging scroll place.(afterwards have producer to improve, in the inner both sides of undersetting, two flexible copper sheets are adorned in riveting increases contact-making surface and pressure).

4, RW11 type product major defect is:

The RW11 type has been inherited the advantage of RW10 type, and the one, adopt exhaust mode step by step, can cut-off fault current and big short circuit current or overload current more reliably, the 2nd, the elater device is beneficial to fuse and ejects fast.Also have an advantage to be; Last lower carriage and intermediate support have adopted fastening preferably design, and stationarity is good.And on this its foundation, have the cambered surface of design lower moving contact to design, have only this design in all models; The burn-out rate that takes place between the lower moving contact is minimum, and upper contact head adopts the embedded shape contact of carving, and upper contact head slides through certain time-delay in the drop-out current course, has guaranteed that electric arc extinguishes in arc-extinguishing tube, prevents upper contact head arcing scaling loss.

The RW11 type uses the shortcoming that still exists easy damage in reality: upper static contact is because the strength of pressurization is bigger, the apodictic corrosion of last moving contact appearance of fusion tube loses smooth in addition, after often causing the fuse scaling loss, landing in good time, the phenomenon of burning fusion tube often has generation.

The utility model content

Technical problem to be solved in the utility model provides a kind of outdoor ac high voltage drop fuse, and it can avoid the appearance of the contact head heating phenomenon of upper and lower side when load is big, also has excellent anti-pollution characteristic.

For solving the problems of the technologies described above, the technical scheme that the utility model adopted is: a kind of outdoor ac high voltage drop fuse comprises binding post, composite insulator, upper static contact, following fixed contact, goes up moving contact, lower moving contact and fusion tube; Described binding post comprises upper connecting terminal and lower connecting terminal, and its key improvements is: described upper static contact and upper connecting terminal are direct-connected; On the described composite insulator outer wall silicone rubber insulation layer is set.

Adopt the beneficial effect that technique scheme produced to be: RW10 type structure is combined with RW11 type structure, and it is upper static contact and upper connecting terminal is direct-connected, and on the composite insulator outer wall, silicone rubber insulation layer is set, effectively prevent at load it is more greatly the contact head heating of upper and lower side, fusion tube falls rapidly after also can guaranteeing fuse failure, form tangible breaking gap, guarantee that circuit is safe in utilization.

Upper static contact of the present utility model partly adopts the upper static contact part of RW10 type structure, simultaneously connecting between the fixed contact on original structure top and the upper connecting terminal with soft copper or thin multilayer copper sheet, change between the fixed contact on top and the upper connecting terminal and directly connecting, remove the soft copper or the connected mode of thin multilayer copper sheet.

The mode that the fusion tube part-structure adopts RW10 type fusion tube structure and RW11 type fusion tube structure to combine; The last moving contact of RW11 type fusion tube is changed to lower moving contact into RW10 type fusion tube; Following fixed contact partly adopts the following fixed contact part of RW11 type structure.

Description of drawings

Fig. 1 is the utility model structural representation;

1, upper static contact; 2, go up moving contact; 3 fusion tubes; 4, lower moving contact; 5, fuse; 6, following fixed contact; 7, composite insulator pillar; Further the utility model is described in detail below in conjunction with accompanying drawing.

Embodiment

A kind of outdoor ac high voltage drop fuse as shown in Figure 1 comprises binding post, composite insulator, upper static contact 1, following fixed contact 6, goes up moving contact 2, lower moving contact 4 and fusion tube 3; Described binding post comprises upper connecting terminal and lower connecting terminal, and its key improvements is: described upper static contact 1 and upper connecting terminal are direct-connected; On the described composite insulator outer wall silicone rubber insulation layer is set.

This product is that RW10 type structure is combined with RW11 type structure, both advantages have been absorbed, and done some structural these and advanced, become a kind of novel fuse switch, product type is the HRW12-12 type, and the utility model fuse switch is partly reached down fixed contact and partly formed by composite insulator pillar, upper static contact part, fusion tube.

Composite insulator pillar one-step mould sulfidization molding has intensity height, in light weight, advantage such as the stretching-resisting bending-resisting ability is strong; The insulator external insulation layer adopts high quality silicon rubber, and the anti-pollution characteristic excellence need not cleaned maintenance; The peculiar hydrophobicity of silastic material and the animal migration of surging make that the insulator after the contamination still has excellent hydrophobicity and high pollution flashover voltage; Good springiness, non-friable, in light weight.

Upper static contact partly adopts the upper static contact part of RW10 type structure, and some improvement have been done, connecting between the fixed contact on original structure top and the upper connecting terminal with soft copper or thin multilayer copper sheet, change between the fixed contact on top and the upper connecting terminal and directly connecting, remove the soft copper or the connected mode of thin multilayer copper sheet.

The mode that the fusion tube part-structure adopts HRW10 type fusion tube structure and HRW11 type fusion tube structure to combine; The last moving contact of RW11 type fusion tube is changed to lower moving contact into RW10 type fusion tube.

Following fixed contact partly adopts the following fixed contact part of RW11 type structure.

Claims (2)

1. an outdoor ac high voltage drop fuse comprises binding post, composite insulator, upper static contact (1), following fixed contact (6), goes up moving contact (2), lower moving contact (4) and fusion tube (3); Described binding post comprises upper connecting terminal and lower connecting terminal; It is characterized in that: described upper static contact (1) and upper connecting terminal are direct-connected.

2. a kind of outdoor ac high voltage drop fuse according to claim 1 is characterized in that: on the described composite insulator outer wall silicone rubber insulation layer is set.

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