CN201229907Y - High voltage wire current fuse for protection of transformer - Google Patents

Abstract

The utility model relates to a high-voltage linear flow fuse used for transformer protection. At present, melts of high-voltage current-limiting fuse (3kv to 40.5kv) produced by China and other countries are both manufactured by adopting pure silver. With the fast development of power industry of China, the requirement to the high-voltage current-limiting fuse is larger continuously; therefore the requirement to the pure silver is also larger continuously. In recent years, the price of the nonferrous metal is greatly increased and the price of the silver is also increased rapidly. The high cost greatly limits the development and the application of the high-voltage current-limiting fuse. The high-voltage current-limiting fuse used for transformer protection comprises a fuse tube which is filled with quartz sand; two ends of the fuse tube are matched with two inner caps; a post is matched between the two inner caps; copper melts with variable section and equal distance are evenly wound on the post; and an impactor is arranged between the inner caps and outer caps. Therefore, the utility model replaces copper with pure silver as a melt, thus leading the production cost of the high-voltage current-limiting fuse to be greatly reduced but leading the performance of product to be constant basically.

Description

Tranformer protection high-voltage line flow fuse

Affiliated technical field:

The utility model belongs to high voltage protection electrical equipment, can be widely used in fields such as power transmission and transformation, box-type substation, city ring network power supply, is a kind of tranformer protection high-voltage line flow fuse specifically.

Background technology:

At present, (melt of 3kv～40.5kv) all adopts fine silver to make for China and the high-voltage and current-limitation fuse produced in the world.Along with the fast development of China's power industry, also increasing to the demand of high-voltage and current-limitation fuse, therefore also increasing to the demand of fine silver.Non-ferrous metal significantly appreciated in recent years, and silver-colored valency is also skyrocketing.This expensive very big development and the application that has limited high-voltage and current-limitation fuse.

Summary of the invention:

The purpose of this utility model is to provide a kind of employing copper as melt, and the reliable tranformer protection of properties of product high-voltage line flow fuse.

For achieving the above object, the technical solution adopted in the utility model is:

The tranformer protection high-voltage and current-limitation fuse; comprise a fusion tube; be filled with quartz sand in the fusion tube; the two ends of fusion tube dispose interior cap; its special character is: be furnished with pillar between the cap in described two; be wound with equally spaced variable cross-section copper melts on the pillar uniformly, dispose striker between interior cap and the outer cap.

Above-mentioned striker adopts gunpowder formula striker, and its structure comprises a guide, is placed with gunpowder in the striker, and a tungsten filament passes stopper and is connected with small cap on the striker by gunpowder.

Above-mentioned striker adopts the spring striker, and its structure comprises a guide, disposes the indication cap by lining in the guide, and an end disposes hook in the indication cap, and the other end disposes brass tube, disposes spring and lead-in wire between hook and the brass tube.

Above-mentioned variable cross-section copper melts length L=625 millimeters, width b=1.27 millimeter, narrow neck b1=0.41 millimeter, radius r=4.51 millimeter, step pitch L=15.2 millimeter.

Length L=610 of above-mentioned variable cross-section copper melts millimeter, width b=2.54 millimeter, narrow neck b1=0.51 millimeter, radius r=0.25 millimeter, angle a=60 degree, step pitch L1=15.2 millimeter.

With respect to prior art, advantage of the present utility model is as follows: employing copper of the present utility model substitutes fine silver as melt, the production cost of its high-voltage and current-limitation fuse is reduced greatly, and properties of product is constant substantially.As: characteristics such as specified breaking capacity is 50KA, has time-current characteristic stable (error is only ± 10%), and current limiting characteristic are remarkable.This product has also passed through the type approval test at national High-Voltage Electrical Appliances quality supervision and test test center and Dutch KEMA cranking test station, makes the quality of its product and performance obtain affirmation.

The utility model is applicable to indoor interchange 50HZ, rated voltage 12KV electric power system, rated current is from 11 kinds of specifications of 6.3A～100A, and can utilize existing high-voltage and current-limitation fuse production line of my company and advanced technology assemble ability and accurate detection means, guarantee constant product quality production, satisfy the demand of domestic, international two big markets this product.

Description of drawings:

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

Fig. 2 is a kind of melt structure schematic diagram of the present utility model;

Fig. 3 is an another kind of melt structure schematic diagram of the present utility model;

Fig. 4 is the structural representation of gunpowder formula striker;

Fig. 5 is the structural representation of spring striker.

Reference numeral: 1-fusion tube, 2-pillar, 3-copper melts, cap in the 4-quartz sand, 5-, the 6-liner, 7-striker, the outer cap of 8-, 9-constantan wire, 10-tungsten filament, 11-epoxy resin, 12-stopper, 13-gunpowder, 14-small cap, 15-guide, the 16-striker, 17-limited part, 18-lead-in wire, 19-brass tube, 20-pad, the 21-guide, the 22-pad, 23-indicates cap, 24-spring, the 25-hook, 26-lining, 27-packing ring, 28-lock washer.

Embodiment:

Below in conjunction with accompanying drawing the utility model is described in detail:

Referring to Fig. 1, the utility model is by 1 fusion tube, 2 pillars, 3 copper melts (dividing thread and banded), 4 quartz sands, caps in 5,6 liners, 7 strikers (dividing gunpowder formula and spring), 8 outer caps, compositions such as 9 constantan wires.Its assembly relation is: become the melt 3 of variable cross-section respectively equidistantly uniformly on pillar 2 on copper wire or copper strips punching out, and on copper melts 3 with low-melting alloy, be used for producing " M " effect,, reduce the temperature rise and the power loss of fuse to improve the interrupting performance of low overload fault electric current.The pillar 2 that point welds is put in the fusion tube 1, with the interior cap soldering at fusion tube 1 two ends together.The striker 7 that will install again is installed between the inside and outside cap 5,8, and the lead-in wire of striker 7 is connected on the connector of cap 5 in the other end.Outer cap 8 is depressed and interior cap 5 formation interference fit, at last highly purified quartz sand 4 is put in the fusion tube by certain particle proportioning, after enriching, the outer cap 8 of the other end is depressed.All zero, parts by weld, compress, filling, interference fit form integral body.

Referring to Fig. 2, the length L of copper melts 3=625 millimeter, width b=1.27 millimeter, narrow neck b1=0.41 millimeter, radius r=4.51 millimeter, step pitch L=15.2 millimeter.

Referring to Fig. 3, the length L of copper melts 3=610 millimeter, width b=2.54 millimeter, narrow neck b1=0.51 millimeter, radius r=0.25 millimeter, angle a=60 degree, step pitch L1=15.2 millimeter.

Referring to Fig. 4, gunpowder formula striker is by 10 tungsten filaments, 11 epoxy resin, 12 stoppers, 13 gunpowder, 14 small caps, 15 guides, 16 strikers, compositions such as 17 limited parts.Its assembly relation is: gunpowder 13 is put into striker 16, tungsten filament 10 passes stockaded village 12 and is connected conduct by gunpowder 13 and small cap 14 on the striker 16 and goes between, acute stopper 12 clogs the gunpowder in the striker 16 and puts into guide 15, with stopper 12 and 11 encapsulation of guide 15 usefulness epoxy resin, just form gunpowder formula striker again.

Referring to Fig. 5, the spring striker goes between by 18,19 brass tubes, 20 pads, 21 guides, 22 pads, 23 indication caps, 24 springs, 25 hooks, 26 linings, 27 packing rings, compositions such as 28 lock washers.Its assembly relation is: drag hook 24 is placed on the spring 23, the lead-in wire 18 from mix hook 24, spring 23 centers are passed, an end is stuck between pad 22 and guide 21 and the pad 20.The other end passes from the center of pad 22, guide 21, pad 20, brass tube 19.When length of spring compressed is reduced to the position, take out tight lead-in wire, with the brass tube compressive strain, making it block lead-in wire can not become flexible.To indicate cap 23 and lining 26 to put into guide 21 at last, guide be stepped up, and make lining 26 fixing, just form the spring striker with anchor clamps.

Operation principle of the present utility model is: fuse is sealed in the circuit of protected electrical equipment; when overload or short trouble take place in circuit; because the thermal effect of electric current; make the copper melts of fuse melt rapidly; vaporization; gap breakdown takes place subsequently; arcing; by the quartz sand extinguish arcs; divide deenergizing; simultaneously arc voltage be added in striker and the lead-in wire that is attached thereto between; enough big electric current is passed through, and gunpowder is lighted in the tungsten filament heating, produces the explosive force of regulation; promote the striker tip and pass (or the lead-in wire fusing of the outer cap of fuse rapidly; the spring energy stored is vowed rapidly puts) provide indication, and, put into practice three interlocks with the trip gear of 2～4 joules the direct pull switch of energy; prevent the phase-deficient operation of circuit, reach the purpose of protective circuit.

Because this high-voltage and current-limitation fuse has disjunction can be high, operate time piece, current limiting characteristic good, can be before short circuit current no show peak value, just circuit is cut off rapidly, thereby the numerical value of limiting short-circuit current, reduction is to the merit of electric equipment in the electrical network, the requirement of thermal stability, economical with materials and cost of investment greatly, and good social benefit and economic benefit are arranged.Mainly adopt the combined electrical apparatus of high-voltage and current-limitation fuse application of load switch to substitute at western developed country and cost an arm and a leg, keep in repair complicated circuit breaker.In China,, will need increasing ring network power supply unit (ring main unit) and box-type substation along with the development of urban network restructuring and power construction.And a large amount of this just costs that adopt of ring main unit and box-type substation are low, the good high-voltage and current-limitation fuse of protection transformer characteristic; by the combined electrical apparatus that this high-voltage and current-limitation fuse application of load switch is formed, have protection level height, dependable performance, price is low, maintenance is simple, easy to use, become common recognition.Therefore, the utility model has vast potential for future development.

Claims (5)

1, tranformer protection high-voltage and current-limitation fuse; comprise a fusion tube (1); be filled with quartz sand (4) in the fusion tube; the two ends of fusion tube (1) dispose interior cap (5); it is characterized in that: be furnished with pillar (2) between the cap (5) in described two; be wound with equally spaced variable cross-section copper melts (3) on the pillar (2) uniformly, dispose striker (7) between interior cap (5) and the outer cap (8).

2, tranformer protection high-voltage and current-limitation fuse according to claim 1; it is characterized in that: described striker (7) adopts gunpowder formula striker; its structure comprises a guide (15); be placed with gunpowder (13) in the striker (16), a tungsten filament (10) passes stopper (12) and is connected with small cap (14) on the striker (16) by gunpowder (13).

3, tranformer protection high-voltage and current-limitation fuse according to claim 1; it is characterized in that: described striker (7) adopts the spring striker; its structure comprises a guide (21); dispose indication cap (23) by lining (26) in the guide (21); an end disposes hook (25) in the indication cap (23); the other end disposes brass tube (19), disposes spring (24) and lead-in wire (18) between hook (25) and the brass tube (19).

4, according to claim 2 or 3 described tranformer protection high-voltage and current-limitation fuses; it is characterized in that: described variable cross-section copper melts 3 length L=625 millimeters, width b=1.27 millimeter, narrow neck b1=0.41 millimeter; radius r=4.51 millimeter, step pitch L=15.2 millimeter.

5, according to claim 2 or 3 described tranformer protection high-voltage and current-limitation fuses, it is characterized in that: the length L of described variable cross-section copper melts 3=610 millimeter, width b=2.54 millimeter; narrow neck b1=0.51 millimeter; radius r=0.25 millimeter, angle a=60 degree, step pitch L1=15.2 millimeter.

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