CONSTRUCTIONAL CHARACTERISTICS

This line of clamps has been planned in order to satisfy more fully the technical needs of tensions up to 400 KV and of current loads relative to such systems.

• ANTI-DISCHARGE DESIGN for a clamp tends to take the shape of a sphere without points, has been achieved by enclosing the heads and nuts of the bolts, generously rounding off the borders and the angles of the clamp and, in some cases, using the aluminium or copper cables of the clamps as equipotential rings. All in order to maintain the RIV level (Radio Interference Voltage) below 100 µ V which is the international limit allowed by the rules.



• The ELECTRICAL RESISTANCE is inferior to the resistance of an equal tract of the conductor. The grooves of the clamp are calibrated and have a rough surface so as to improve the contact with the conductor.



• The SPEED TEMPERATURE of the clamp is lower than that of the conductor.
• MECHANICAL RESISTANCE due to the abundance of the material, to the total lack of screw threads in the founding, and to the size of the nuts and bolts, which given a maximum guarantee of sealing against electrodinamic stress and against stress generated by the eolic vibrations.

• DESSIN ANTI-EFFLUVE avec form qui tend à la sphericité et absence des pointes obtenue par l'encastrement des têtes et des boulons, par l'arrondissement avec grand rayon les bords et les aretês du borne et par l'utilisation, en quelques cas, les câbles d'alluminium ou de cuivre du borne à la façon de bagues equipotentielles. Tout cela pour mantenir le niveau RIV (Radio Interference Voltage) au-dessous des 100 µV limite international reconnue par le régles.
  
• RÉSISTANCE ELECTRIQUE de la connexion inférieure à la résistence d'un même bout de conducteur. Les surfaces de gorges des bornes sont calibrées et rugueuse pour améliorer le contact avec le conducteur. 
  
• TEMPERATURE DE REGIME du borne inférieure à celle du conducteur


• STABILITE' de la connexion dans le temps.
  
  
• GRANDE RÉSISTANCE MECANIQUE due à l'abondance du materiel, à l'absence de filetage dans les fusions, et aux dimensions de la boulonnerie. Tout cela garantisse la plus grande étanchéité à les forces électrodynamiques et à les forces generées par les vibrations eoliennes.

THECNIQUE AND DESIGN OF THE CLAMPS: Al-Al, Al-Cu

Promeco S.r.l. has achieved the Al-Al and Al-Cu connection by means of a widely accepted technique, that of "ELECTRONIC DENSITY IN ANODIC MASS".
As well is known, when two metals Al and Cu come into contact and are immerged in a pollutive environment, electrolysis phenomenon may occur. During this phenomenon an electronic current emerges, for which reason the Al ions extracted from the electric potential of the torque are deposited on the cathode, starting that process of alluminium erosion and of deposit on the copper which is in direct proportion to the grade of aggressivity either of the electrolyte force or of the environment, (table 1).
It must also be noted that the joints Al-Cu in a clean environment, for example in a rural area, suffer no damage whatsoever. With the aim of avoiding the destruction of the connector "ANODIC MASS CLAMPS" are used, which can guarantee corrosion control up to a saturation point which the clamp mass is perfectly adequate for guarantee the passage of the pre-calculated load, with a considerable safety margin. "Anodic mass clamps", because of the large Al mass, offer a greater irradation surface with a conseguently lower superficial electronic density and, at last, the clamp is able to resist longer than the conductor in any external environment.