SU1617502A1 - Socket clamp - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase reliability by providing electrodynamic stability and increasing contact pressure by jamming the conductors in the clamp at short circuit currents. The female clamp consists of a housing 1 with a V-shaped base, a clamping mechanism 2, a notched lining 3, a V-shaped contact element 4. The interfacing surfaces of the base of the housing 1 and the contact element 4 are made obliquely. Since the conductor is connected through the notch with the cover 3 and through it with the clamping mechanism 2 and the housing, when the conductor moves, the clamping body 1 is displaced relative to the contact element 4, which creates an additional wedging force. 1 il.

Description

The invention relates to electrical engineering, in particular to devices for connecting electrical conductors to various electrical devices.

The purpose of the invention is to increase reliability (by ensuring electrodynamic stability) and contact pressure (due to jamming of conductors in the clamp at short-circuit currents) of the socket clamp.

The drawing shows a socket clip with an inserted conductor, a section.

The socket clamp consists of a housing 1 with a U-shaped base, a clamp mechanism 2 • a trim 3 with a notch and an U-shaped contact element 4. The notch of the trim 3 is perpendicular to the direction of the conductor 5 into the clamp. The mutually adjacent surfaces of the base of the housing 1 and the contact element 4 are made beveled. The extended side of the contact element is located on the input side of the conductor.

Socket clamp works as follows.

An electrical conductor 5 is laid between the cover 3 and the contact element 4. The clamp mechanism 2, made in the form of a fastening screw, for example a bolt, is wrapped in a hole in the housing 1. The cover 3 presses the conductor 5 to the contact element 4, the contact element itself to the base housing 1, providing a guaranteed value of electrical resistance between the conductor 5 and the contact element 4. The tabs 3 of the lining cut into the conductor

5. At the initial moment, under the action of electrodynamic forces, the conductor tends to break out of the clamp. Since the conductor through the notch is connected with the strip 3 and through it with the clamp mechanism 2 and the housing 1, when the conductor moves, the clamp housing 1 is displaced relative to the contact element 4, as a result of which an additional proppant is created that helps to hold the conductor in the clamp. In addition, after the termination of the electrodynamic forces, the clamp behaves as tightened during routine maintenance.

From mechanics it is known that the condition of the wedge is an angle of 7 - 8 ° (for example, GOST 8593 - 81 Normal cones and cone angles).

An experimental verification of this premise confirmed the operability of the socket clamp at the indicated bevel angles of the housing and the contact element: at an angle of more than 8 °, the pressure of the conductor to the contact element is weakened due to various mechanical influences, i.e. in this case, the principle of self-braking is not fulfilled, at angles less than 7 °, jamming of the wire is ineffective.

Example. To test the performance of the proposed design of the nest clamp, a clamp similar to the prototype clamp and the proposed nest clamp were manufactured.

Case 1 and plate 3 were made of aluminum alloy AD31T1, steel bolts M12, contact elements 4 - copper. The prototype clamp was threaded without beveling the lining and the body. In the proposed socket clamp, the mutually adjacent surfaces of the base of the housing and the contact element were made beveled at an angle of 7.5 °. The notch of the patch at the prototype clamp was made along the direction of entry of the conductor. The notch of the lining of the proposed socket clamp was made perpendicular to the axis of the conductor. A single-wire aluminum wire with a cross section of 70 mm ² was attached to the clamp. After conducting tests for heating with a rated current (the parameters of the clamps were almost the same), the clamps were tested with a one-second short-circuit current equal to I short circuit = 10 · 1m = = 2300A. After the test, the tightening torque of the bolt at the clamp ^; the prototype decreased from ZON · m to 12N · m, while the electrical resistance of the contact connection increased by 60%, while the tightening torque of the proposed socket clamp decreased to 24N · m, and the resistance increased by 10%.

Thus, the test of the proposed nest clamp showed its increased reliability compared to the prototype clamp.

Claims (1)

Claim Socket clamp containing the housing, the clamping mechanism, made in the form of a screw with a clamping jaw V-shaped, having on the inner surface of the notch, perpendicular to the axis of the clamped conductor, the contact element interacting with the base of the housing and with the conductor, characterized in that, in order to increase reliability by ensuring electrodynamic stability and increasing contact pressure due to jamming of the conductor in the clamp of the short-circuit inflows, the contact element from the side of the clamped conductor is U-shaped, and the mutually adjacent surfaces of the base 5 of the housing and the contact element are angled to the axis clamped conductor, and the extended side of the contact element is located on the input side of the conductor. Compiled by E. Nechaev Editor A. Revin Tehred M. Morgenthal Corrector A. Osaulenko 4 Order 4122 Circulation 422 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow. J-35. Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.