DE966962C - Clamp for electrical lines made of different materials - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

ISSUED SEPTEMBER 19, 1957

GERMAN PATENT OFFICE

PATENT LETTERING

CLASS 21c GROUP 2102 INTERNAT. CLASS H 02f

H 14126 VIIIdJ 2i c

Gebr. Hannemann & Cie. G. m. B. H., Düren

Clamp for electrical wires made of different materials

exist

Patented in the territory of the Federal Republic of Germany from October 14, 1952

Patent application published January 5, 1956

Patent issued September 5, 1967

The cable clamps are an essential factor when laying electrical cables which, depending on their specific application, can be used for connecting, connecting or branching off serve by power lines. The requirements for a good clamp are very diverse; she must not only must be able to cope with mechanical stresses, but also electrical ones Be impeccable, d. H. Provide good and permanent contact between the lines. This applies in particular to the overhead line terminals, where there is still another difficulty the harmful effects of atmospheric influences are added. The possible consequences poor connections, caused by poor construction or use Unsuitable material for the terminals as well as corrosion of the terminal parts can lead to a deterioration in the contact with impermissible heating and scorching of the clamp connection ao

709 681/19

to lead. The repair of such damage in overhead line construction is. mostly difficult, and because of this rarely goes off without a breakdown, also quite expensive.

When connecting two conductors of the same material, e.g. B. two copper or two aluminum ladders If the clamp is made of the same material as the conductor, the risk of corrosion is low is.

ίο The difficulties pile up when Conductors made of different materials, for example Cu and Alu as the main representatives of the line material, are to be connected to one another. The clamp material for this can neither be just Cu nor just aluminum, because the addition of an electrolyte, e.g. B. moisture, Vapors or debris from the air related to electrolytic element formation with the two conductors is given, which is known to destroy the less noble metal and thus the whole clamp connection leads. To avoid this disadvantage, two-metal clamps - so-called Alcu clamps - were created, which mainly consist of two metals from Material of the different conductors exist, so that the respective lead wire always only with comes into contact with the terminal part of the same material. The dissimilar terminal parts are mostly in Rolling process pressed against each other and the parting line protected by insulating compound.

This type of bimetal clamp fulfills its purpose only imperfectly because the insulating compound can flow away when heated, so that the metal separation point is exposed to the effects of corrosion without protection and destruction begins within the clamp itself.

In addition, because of their high price, these terminals are also satisfactory from an economic point of view not. Due to the need to use two kinds of metals, their connection between each other and insulation, the terminal structure is complicated, so that the terminal is already in series production is relatively too expensive. In the case of the clamp according to the invention, these are Defects avoided in that from the principle of the two-metal clamp and to the single-material clamp was passed over. The special, neutral one that meets the requirements Material was found in the stainless steel, for example V2A. The latter guarantees according to its natural composition not only corrosion resistance against atmospheric and chemical influences, but also avoids due to its favorable position in the electrolytic Voltage series between the normal potentials of Cu and Alu and the associated ones element formation of practical importance only with small voltage gradients. the Invention provides through the safe use of a single material clamp for electrical conductors different materials represent a significant advance. The clamp can vary depending on its use be designed as a connecting, connecting or branching terminal. Since they are punched or Printing process is produced, the series production can be carried out inexpensively.

The increase in resistance caused by the material steel is generously measured by the Cross-section of the terminal parts and the short current transitions are practically meaningless.

In the drawing, for example, embodiments of the concept of the invention are shown. It shows

Fig. Ι a connecting clamp in the form of a clamp in front and top view,

Fig. 2 shows a branch clamp in the form of a clamp seen from the front and from below,

Fig. 3 shows a branch terminal with a clamp in a view from the front and from below,

Fig. 4 a tension clamp in front and bottom view.

The connecting clamp according to Fig. 1 consists of an upper and a lower clamp-shaped clamping plate α and b, which are made of different materials by means of a screw c after the adjacent conductors d and e have been inserted. and cross-section are pressed together. The clamping plates are made of stainless steel, e.g. B. V 2 A, designed so that the most viable conductor cross-sections can be clamped. Frames f pressed through on the upper part grip into corresponding recesses in the lower part for guidance and thereby prevent the two plates from twisting against each other.

An embodiment with superposed conductors is shown in Fig. 2. In this case, the conductors are clamped together by two clamp-shaped plates g and h with the interposition of a pressure plate i by means of two clamping screws. The lower plate is kept smaller than the upper one so that the branch conductor can be angled before it exits the terminal, which prevents direct contact with the other conductor.

Another embodiment is shown in Fig. 3. This is a branch terminal with a clamping bracket for lines lying one on top of the other. This clamp also has two clamp-shaped clamping plates k and I with pressure plate m , which are made of stainless steel. The plates are held together by the clamping bracket 0 . The lower clamp plate is smaller than the upper plate for the same reasons as explained earlier.

Finally, in Fig. 4. a clamp design suitable for tensioning purposes is also shown. In contrast to the clamp according to Fig. 3, the upper clamping plate ^ and the pressure plate q have clamp-shaped bulges for two through lines, while the lower pressure plate r is set up for a branch line. All lines are clamped by means of clamp s.

However, the use of single-material clamps according to the invention is compatible with these exemplary embodiments not exhausted. The invention

thought can also be used with many other clamp constructions.

Claims (5)

Patent claims: 1. Clamp for electrical lines made of different materials, namely Copper and aluminum, in particular overhead line clamp, characterized in that all terminal parts that come into contact with the conductors are made of stainless steel Steel are made in the electrolytic series approximately in the The middle of the normal potentials of Cu and Alu lies, e.g. V2A steel. 2. Clamp according to claim ι for adjacent conductors, characterized in that it is formed in a known manner as a connecting clamp with clamp plates (a uiid b), frames (/) on the upper clamping plate and a pressure screw (c) ( Fig.i). 3. Terminal according to claim ι for two superimposed conductors, characterized in that it is designed in a known manner as a branch terminal with clamp plates (g and K), a pressure plate (i) and two pressure screws (Fig. 2). 4. Terminal according to claim 1 for two superimposed conductors, characterized in that it is designed in a known manner as a branch terminal with clamp plates (k and Z), a pressure plate (m) and clamping bracket (0) (Fig. 3) ). 5. A clamp according to claim 1 for two adjacent through lines and a branch line arranged therebelow, characterized in that it is in a known manner as a tensioning clamp with two clamp-like curved clamping plates (p and q), a pressure plate (r) and a clamping bracket (s) is formed (Fig. 4). For this, 1 sheet of drawings © 509 627/92 12.55 (708 681/19 9.57)