RU171231U1 - HIGH-VOLTAGE HARDWARE CLAMP - Google Patents

Abstract

The high-voltage pin hardware clamp is designed to connect wires and a rigid busbar to the copper terminals of electrical devices made in the form of a pin.The technical result is to reduce the risk of damage to the clamp coating during glaciation, eliminating the possibility of the wire sticking out of the clamp during glaciation, uniform crimping of the wire pin when covered by a bracket. The clamp can also be used as a connecting one. The indicated technical result is achieved due to the fact that the claimed high-voltage pin hardware clamp, consisting of a base, contact foot, staples, tightening bolts, and the contact and clamp clamps are made of coated copper alloy, characterized in that the clamp housing has a semi-cylindrical recess for laying the wire pin, as well as four through holes for tightening bolts, and two brackets are used for crimping, each of which is made with half with cylindrical recesses and has two holes for tightening bolts; the contact foot of the clamp is inclined with respect to the housing at an angle in the direction of the side of the housing that is opposite the recess, and in the base of the body, in the direction of the contact foot, a deepening of a larger radius is made than the radius of the groove in the housing, wherein the junction of the contact foot and the base of the clamp has sides of the stiffener.

Description

The high-voltage pin hardware clamp is designed to connect wires and a rigid busbar to the copper terminals of electrical devices made in the form of a pin [H02G 15/02].

Known patent RU 2255403 for "HARDWARE CLAMP", published: 06/27/2005.

The invention relates to the field of electric power and can be used as hardware clamps, providing connection of wires to the terminals of switchgear apparatuses. The clamp has an aluminum body and a contact foot. An additional plate 5 of aluminum plated with copper is superimposed on the contact foot. The thickness of the copper layer is in the range of 0.05-0.4 mm, while the ratio of the thickness of the copper layer to the thickness of the aluminum layer 6 is 1-60. This allows for a significant increase in the service life of the hardware clamp (at least 20 years); if, as a result of the action of electrochemical corrosion, the aluminum layer and the copper layer wear out, the additional plate is simply replaced with a new one and the hardware clamp is operated further.

Known patent RU 2334330 on "HARDWARE CLAMP", published: 09/20/2008.

The invention relates to the field of electric power and can be used as hardware clamps, with the help of which branches from the wires of overhead power lines and connecting wires to the terminals of substation switchgear are performed. The clamp has an aluminum case (2) with a wire (1) fixed in it and a contact foot (3) made of aluminum with a surface layer of copper on it. To reduce the metal-consuming characteristics of the clamp, its design dimensions are optimized, namely, the cross-sectional area of the housing, the length of the crimping of the housing (2) on the wire. Taking into account the tolerances for rental and machining of clamps, K _crimping. wires (1) in the housing (2) is taken in the range of 4-16% with an optimal value of 7%. The proposed hardware clamps are characterized by low metal consumption and cost due to their optimal design study.

Known patent RU 2524520 for "HARDWARE CLAMP", published: 07.27.2014.

The invention relates to the electric power industry and is used as hardware clamps for branching off wires from overhead power lines and connecting wires to the terminals of substation switchgears. The clamp consists of a housing 1 with an opening 14 for a wire 3 and a contact foot 2. The clamp is made with an additional drain through hole with a diameter of d = 1 ÷ 20 mm in a cavity of variable cross-section of the transition of the housing 1 to the contact foot 2. In the manufacture of the housing 1 from a standard round pipe or a special profile, the wall 5 of the drainage through hole 6 is located at a distance n1 = 0 ÷ 80 mm, measured from point 7, where the cavity of the variable cross section 8 of the transition of the housing 1 to the contact foot 2 ends. In the manufacture of the housing 1 of the rod, the wall 9 is drained zhnogo through hole 10 located at a distance n2 = 1 ÷ 35 mm, measured from the point 11, where ends tapered portion 12 of the cavity 13 of variable section, the transition of the housing 1 in the contact tab 2 formed in the machining hole 14 under the wire 3 in the casing 1 clamps. The invention provides high operational reliability when operating the clamp in the open air under humidification conditions.

Known patent RU 2337446 on "HARDWARE CLAMP", published: 10.27.2008.

The invention relates to the electric power industry and can be used as hardware clamps for connecting wires to substation switchgear apparatuses. The technical result is a reduction in material consumption, cost and a high degree of unification. The clamp consists of an aluminum contact foot (1) with a cylindrical rod (2) on one of its sides, inserted into the housing (3) and pressed by a matrix in the crimping zone l _pressure. = l _oppress.k. . For hollow wires (9), the cylindrical rod (6) of the contact foot (7) is performed with a step transition (c) of width b = 2 ÷ 4 mm; the height h1 and width b1 of the step are equal to: h1 = l, 5 ÷ 2.5 mm and b1 = 2.5 ÷ 4.5 mm. To increase the contact surface of the housing (3), triangular grooves (4) can be made on the shaft (2) with a height h at an angle of inclination of the triangular tooth of the groove α = 30-60 °, determined from the relation h = (0,075 ÷ 0,15) ⋅ d _pr.min , where d _pr.min - the minimum diameter of the wire (9) from the group mounted in the hardware clamp. The length of the crimping of the hollow wire (9) is calculated by the following ratio: l _crimp.s = (0.45 ÷ 0.65) ⋅l _oppress.k. , and the length of the housing (8) depends on the length of the rod 6 and is determined by the following ratio: L _k = (0.85 ÷ 0.95) ⋅L _l . For lines with split wires, the cylindrical rod 6 is bent at an angle α ₁ = 35-55 ° relative to the longitudinal axis (1) of 1 contact foot (7).

Known patent RU 2262787 on "HARDWARE CLAMP", published: 20.10.2005.

The invention relates to the field of electric power and can be used as hardware clamps, providing connection of wires to the terminals of switchgear apparatuses. The clamp has an aluminum body 1 and a contact foot 2. A layer of copper 4 is applied to the contact foot with a thickness of more than 450 microns with a roughness index within the range of 20 ÷ 320 microns; the copper layer 4 is applied to the aluminum contact pad 2 by means of a gas-plasma jet in which the copper wire is melted at high temperature and high pressure; copper is one third of its thickness at the molecular level in the aluminum layer. This method of spraying allows you to get a dense layer of copper on an aluminum substrate of high hardness, which makes it possible to ensure good electrical contact of the hardware clamp for a long period of its operation; the copper layer 4 practically does not wear out due to the high hardness and large thickness during periodic cleaning of the surface of the contact foot 2, when it is necessary to remove the oxide film. The service life of this hardware clamp reaches 20 ÷ 25 years.

Copper-clad aluminum legs have high resistance and poor conductivity during glaciation, lower than that of materials based on copper alloys, such as brass.

The closest analogue is the LV clamp on the high-voltage transformer manufactured by NPO Energokomplekt [http://www.ek21.ru/production/kompl-tran/zagim/], publ.: 04/09/2016. Current-collecting contact clamps are made by casting from LS-59 brand brass (which has low resistance and provides good electrical conductivity), followed by machining. If necessary, tin-bismuth (O-Bi) is coated on the die clamps for the best connection of conductivity and better insulation with external sources, thereby reducing heating losses.

High-voltage pin hardware clamps consist of several elements: base; contact foot; bracket; tightening bolts. The contact and clamp bracket are made of brass (an alloy of copper with zinc, characterized by high strength).

The disadvantage of the prototype and other known clamps are:

- uneven crimping of the wire pin when it is covered by a bracket and tightened by clamping bolts, since crimping occurs either in a narrow place or with wide coverage, but with a clamp on one side;

- a high risk of damage to the cover of the clamp during glaciation and, as a result, increased resistance in the area of the foot and current loss; this is due to the fact that in through-type clamps, where the pin extends through the bracket and does not rest against the body, ice glides between the pin and the contact foot, which, when bursting against the outgoing end of the wire pin, spoils the cover of the foot;

- if a clamp is used, where the pin rests on the case, then the moisture that accumulates accumulates at the end of the pin, and when it freezes, it pushes the end of the wire out of the clamp, which is fraught with the wire falling out of the clamp when the temperature changes from minus to plus and vice versa.

The objective of the utility model is to eliminate these drawbacks.

The technical result is to reduce the risk of damage to the coating of the clamp during glaciation, eliminating the possibility of bulging the wire out of the clamp during glaciation, uniform compression of the pin of the wire when covered by a bracket. Also, the clamp can be used as a connector.

The specified technical result is achieved due to the fact that the claimed high-voltage pin hardware clamp, consisting of a base, contact foot, staples, tightening bolts, and the contact and clamp clamps are made of coated copper alloy, characterized in that the clamp body has a semi-cylindrical recess for laying the pin of the wire, as well as four through holes for tightening bolts, and two clamps were used for crimping, each of which is made with semi-cylindrical recesses and has two holes for tightening bolts; the contact foot of the clamp is inclined with respect to the housing at an angle in the direction of the side of the housing that is opposite the recess, and in the base of the body, in the direction of the contact foot, a deepening of a larger radius is made than the radius of the groove in the housing, wherein the junction of the contact foot and the base of the clamp has sides of the stiffener. Preferably, the clamp and staples are made of bronze or brass. Preferably, the coating of the clamp and staples is made on the basis of tin, which is applied by electrochemical tinning.

Brief Description of the Drawings

In FIG. 1 shows the appearance of the clip in different angles.

In FIG. 2 shows the principle of fixing the wire pin in the clamp.

In FIG. 3 shows an example of connecting the clamps to each other.

In FIG. 4 shows an example of using the clamp as a connector.

In FIG. 5 shows disassembled clamp elements.

In the drawings: 1 - base of the clamp, 2 - bracket, 3 - contact foot, 4 - recess in the base of the clamp, 5 - recess in the bracket, 6 - holes for tightening bolts in the bracket, 7 - holes for tightening bolts in the base of the clamp, 8 - a recess in the direction of the contact foot, made of a larger radius than the radius of the recess in the housing, 9 - stiffener, 10 - tightening bolts, 11 - holes for fixing the contact foot, 12 - wire.

Utility Model Implementation

The risk of damage to the tin coating of the clamp during glaciation is reduced by the fact that they use (see Fig. 1, Fig. 5) the clamp body 1 and the brackets 2 with recesses 4 and 5, respectively, which provide a longitudinal long crimp of the wire 12 (see Fig. 2 ) and its uniform coverage in a circle. The use of insulated brackets 2 eliminates the accumulation of moisture inside the crimped part of the wire 12. If glaciation does occur, then between the brackets 2, which does not affect the process of reducing the quality of crimping and conductivity.

The risk of damage to the cover of the clamp during glaciation is also reduced by the fact that the contact foot 3 of the clamp is deflected relative to the housing 1 at an angle in the direction of that side of the housing that is opposite to the recess 4, and in the base of the housing, in the direction of the contact foot 3, a recess 8 of a larger radius is made, than the radius of the recess 4 in the housing.

Thus, the risk of damage to the clamp coating during glaciation is reduced by isolating the pin 12 of the crimped wire from the direct interaction of the ice growing on it with any parts of the clamp body 1 or contact foot 3, which eliminates damage to the tin coating by ice.

The exclusion of the possibility of bulging the wire 12 from the clamp 1 during glaciation is achieved by the general design of the clamp, in which the housing of the clamp 1 and two brackets 2 have recesses 4 and 5; the contact foot of the clamp 3 is inclined relative to the housing at an angle in the direction of that side of the housing, which is the recess 4, and in the base of the housing, in the direction of the contact foot, a recess 8 of a larger radius is made than the radius of the groove 4 in the housing.

Those. the through passage of the pin 12 during crimping with brackets and eliminating the accumulation of moisture in the crimping zone, which allows the ice to push the pin, ensure that the wire does not protrude from the clip during glaciation.

Uniform compression of the pin of the wire 12 when covered by a bracket is ensured by the fact that the clamp body 1 has a semi-cylindrical recess 4 for laying the pin of the wire, and also two brackets 2 are used for crimping, each of which is made with semi-cylindrical recesses 5.

Due to the deviation of the contact foot 3 of the clamp relative to the housing 1 at an angle, and also due to the fact that in the base of the body, in the direction of the contact foot, a recess 8 is made larger than the radius of the recess in the housing, glaciation around the protruding end of the pin does not create pressure the base of the clamp 1 and the foot 3, thereby not weakening the degree of compression.

Contact foot 3 carries a large load. Therefore, the presence of stiffening ribs 9 on the sides at the junction of the contact foot 3 and the base of the clamp 1 is necessary for forming the strength of the joint zone of the contact foot due to its deviation from the clamp body at an angle.

Holes 6 in the clamp and holes 7 in the brackets through which the tightening bolts 10 are passed, along with the bolts, can provide the very purpose - the function of crimping the pin of the wire 12 on the clamp.

The use of the clamp as a connector is achieved due to the presence of two brackets 2, each of which can crimp 1 wire (see Fig. 4). The deviation of the contact foot 3 of the clamp relative to the housing at an angle in this case is also necessary, since the wires 12 are on both sides, and without deflecting the contact foot, one of the wires will expand the foot during glaciation, creating a force of pushing out of the bracket, which is fraught with the possibility of the wire falling out of the girth .

In the contact foot, holes 11 are made for the connecting bolts, with which (see Fig. 3) the clamps are connected to each other, forming parallel directions of wire pulling.

The contact and the clamp bracket can be made of both copper and its alloys, for example, bronze or brass.

The clamp and staples are made on the basis of copper alloys, for example of bronze or brass, which ensures good conductivity.

The coating of the clamp and staples can be made on the basis of tin. The coating is applied by electrochemical tinning, which is carried out in several stages:

- chemical degreasing of the surface with a special composition;

- rinsing in hot water, followed by rinsing in cold technical running water;

- chemical etching in sulfuric acid;

- flushing in cold technical running water;

- Electrochemical tinning;

- rinsing in hot water, followed by rinsing in cold technical running water;

- purge with compressed air;

- drying in an oven.

This principle of coating provides higher reliability and preservation of the clamp in working condition for more than 30 years.

Claims (3)

1. High-voltage hardware pin clamp, consisting of a base, a contact foot, a bracket, tightening bolts, the contact and clamp of the clamps being made of a copper-based alloy with a coating, characterized in that the clamp body has a semi-cylindrical recess for laying the wire pin, as well as four through holes for tightening bolts, and two clamps were used for crimping, each of which is made with semi-cylindrical recesses and has two holes for tightening bolts; the contact foot of the clamp is inclined with respect to the housing at an angle in the direction of the side of the housing that is opposite the recess, and in the base of the body, in the direction of the contact foot, a deepening of a larger radius is made than the radius of the groove in the housing, wherein the junction of the contact foot and the base of the clamp has sides of the stiffener. 2. The clamp according to claim 1, characterized in that it is made of bronze or brass. 3. The clamp according to claim 1 or 2, characterized in that the coating of the clamp and staples is made on the basis of tin, which is deposited by the method of electrochemical tinning.

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