RO119491B1 - Electric joining clamp and process for fitting the same on a bunched conductor - Google Patents

Abstract

The invention relates to an electric joining clamp and to a process for fitting the same on a bunched conductor, used for low, mean and high voltage open-air transmission lines or for electical networks with insulated wires. According to the invention, the electric joining clamp comprises a metallic pipe (1) crimped for an equal number of times on the bare ends (a and b) of some conductors (3 and 4) and a non-conductive tube (2) made of thermally shrinkable material, such as for example, cross-linked polyethylene, having a larger diameter before thermally shrinking and which is moulded on the pipe (1) and on the conductors (3 and 4), after heating. According to the invention, the process for fitting the electric joining clamp stipulates that, after introducing the ends of the conductors into the metallic pipe and crimping it, a non-conductive themally shrinkable tube is drawn over the pipe and heated at 180 C, until it shrinks and moulds both on the pipe and on some insulated zones of the conductors. The clamp provides for a better mechanical resistance and for a good thightening and resistence in time.

Description

The invention relates to a drill clip and to a mounting procedure on twisted conductor used in low and medium voltage overhead power lines or in electrical networks with isolated conductors.

A metal conductor electrical socket is known, provided with a molded plastic shirt, the socket that is crimped on the ends of the conductors over the plastic shirt having sealing gaskets on the ends.

This plug has the disadvantage that it does not provide adequate sealing against moisture and water over time.

A process for fitting the known socket is known by directly crimping the socket with the plastic shirt.

This process has the disadvantage that, during the crimping of the crimping trays, cracks can occur in the plastic material shirt, leading to a non-tightening of the electrical connection, and the crimping of the metal junction on the conductor is weak, due to the break of the plastic shirt between the junction and the plastic jacks. crimp.

The technical problem that the invention solves is to create an electric drilling means that can be firmly crimped on conductors with increased mechanical resistance of the drilling, by a process that ensures a safe sealing and resistance in time, against water and moisture. .

The electric drill clip, according to the invention, solves this technical problem and removes the above disadvantages by being made of an insulated metal pipe on the outside, crimped over the insulation in an equal number of times on some bare ends of some conductors and an electrically insulating tube made of thermocontractable material, for example cross-linked polyethylene, with a larger diameter before thermocontracting and molded on the pipe and conductors after heating.

The process of mounting the clamp on the twisted conductor removes the above disadvantages by providing that, after inserting the ends of the conductors into the metal pipe and crimping it, a heat-shrinkable electrically insulating tube is pulled over the pipe and heated to 180 ° C, until it contracts and it is molded both on the pipe and on isolated areas of the conductors.

By applying the invention, the following advantages are obtained:

- it provides an increased mechanical resistance of the electrical connection of the conductors;

- achieves a safe seal and resistance over time;

- ensures complete electrical insulation and with a dielectric rigidity at least equal to that of the electrical conductors.

The following is an example of embodiment of the invention in connection with FIG. 1 and 2, representing:

FIG. 1, section through the electric drill clamp, with the heat-shrinkable electrically insulating outer tube molded on the solid electric conductors;

FIG. 2, section through the drill clip before mounting on the electric drill conductors.

The electric drill clip, according to the invention, is composed of a metal pipe 1 and a heat shrinkable electrically insulating tube 2.

The metal pipe 1 has an inside diameter correlated with the diameter of some electrical conductors 3 and 4 in some end zones a and b, disassembled for their insertion in the metal pipe 1, symmetrically each end up to the middle of the pipe 1, in length, with minimal play until lightly pressed. The metal pipe 1 has an outer casing 5, electrically insulating, made of plastic board fixed or molded initially before mounting on the conductors.

RO 119491 Β1

The insulating tube 2 is made of a heat-shrinkable material, for example cross-linked polyethylene, and has an inner diameter c with a ratio of 1.6 ... 1.8 compared to an outer diameter d, of the metal pipe 1, and a length e in a ratio of at least 2 to 50 lengths of metal pipe 1.

The material of the insulating tube 2 is chosen so that it has a dielectric stiffness at least equal to that of the insulated conductors 3 and 4.

The method of mounting the drill clip, according to the invention, consists of inserting the disassembled ends a and b, of the conductors 3 and 4 in the metal pipe 1, in a similar way, 55, after which the pipe 1 is crimped over the insulation constituted by the outer jacket 5 , on the bare ends a and b, several times, for example 4 times on each end, starting from the middle of pipe 1 towards the ends. After crimping, pull the electrically insulating tube 2 over pipe 1, symmetrically in length, and heat tube 2 with open flame or hot air at 160 ... 180 ° C, until it contracts and tightens on pipe 1 and on electric conductors 3 and 4 on isolated areas g and h.

Claims (2)

claims 1. Electric clamping clamp of two twisted insulated electrical conductors, 65 characterized in that it is made of a metal pipe (1) with an inner diameter correlated with the diameter of some ends (a and b) of electrical conductors (3 and 4 ), ensuring a minimum play until slightly pressed and crimped on these ends (a and b) in a number of crimping equal for each end, for example 4 times, an outer jacket (5) electrically insulating initially fixed before mounting and an electrically insulating tube (2) of thermocontractable material 70, for example cross-linked polyethylene, with a dielectric stiffness at least equal to that of insulated conductors (3 and 4) having an inner diameter before thermocontracting in the ratio of 1.6 ... 1, 8 with respect to an outer diameter (d) of the metal pipe (1) and a length (s) in relation to a minimum of 2 with respect to a length (f) of the metal pipe (1), and molded after a heat shrinkage phase, both pipe metal (1), as well as on some areas (g and h), isolated by 75 twisted electrical conductors (3 and 4). 2. Method for mounting on the twisted conductor, the electric clamping clamp, according to claim 1, characterized in that, after inserting some disassembled ends (a and b) of twisted conductors (3 and 4) into a metal pipe (1). ), the crimping of the metal pipe (1) is carried out on an outer sleeve (5), electrically insulating, on the ends 80 desolated (a and b) in an equal number of times on each end starting from the middle of the pipe (1), after which pull the insulating tube (2) over the pipe (1), symmetrically along the length, and heat it with an open flame or warm air at 16O ... 18O ° C, until it contracts and tightens both on the metal pipe ( 1), as well as on isolated areas (g and h), of the conductors (3 and 4). 85