Three-phase short-circuiting device for MV OHL line – application from the ground or height – CAA clamp

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SKU: Msp CAA - U - 2xSf/lf - Sp/lp - O/p
Category:

Intended use: earthing and short-circuiting of conductors for MV overhead lines.

Application: from the ground, by the successive lifting of each clamp, hanging of the automatic self-locking clamp (CAA) on the conductor, followed by the pulling down of the clamp which becomes detached automatically from the mounting adapter.

Considering the weight of the phase clamp, connected to the earthing conductor and the positioning of the overhead conductors at approx. 9 m from the ground, the application of clamps with the 9 m telescopic stick is difficult to perform in bad weather conditions. In order to facilitate the application of clamps on overhead conductors, it is recommended to procure the pulley system for the lifting of the short-circuiting clamps from the ground.

The following sequence of operations shall be observed:

1. By means of the earthing subassembly, one conductor of the line is earthed

2. By means of the short-circuiting subassembly, the three conductors of the line are short-circuited, starting with the conductor earthed in the previous operation.

Self-locking automatic clamps (CAA) must be handled using an insulating stick appropriate to the installation and the mounting position.

 

Components:

The short-circuiting subassembly for 3 overhead conductors includes the following components:

  • Automatic self-locking clamp (CAA) – 3 pieces
  • Short-circuiting cable – 2 pieces

The earthing subassembly includes the following components:

  • Self-locking automatic clamp (CAA) – 3 pieces
  • Earthing cable – 3 pieces
  • Manual earthing clamp – 1 piece
  • Mounting adapter (AM/C) – 1 piece
  • Removal hook (CDA/C) – 1 piece
  • Mobile earthing electrode (peg) – 1 piece

Packing: waterproof bag.

Other equipments to be used:

-connectable insulating stick type PMU 20-1 B/ba or PMU 20-1 B/baS (for application from height), provided with ‘’RO bayonet’’ coupling system

-telescopic insulating stick type PTU 20-35 F, PTU 20-110 F or PTU 20-45-110F 9for application from height), provided with ‘’hexagon 12’’ coupling system

-telescopic insulating stick type PTU-AS-400-6-c (for application from the ground), provided with ‘’hexagon 12’’ coupling system

Tips: coupling ends of the clamp applicator and of the removal fork must be selected to be adapted to the coupling system of the insulating stick used.

Technical characteristics

Value

Earthing  Sp cable cross-section  (mm2)

16

25

35

Nominal short-circuit for t = 1 s Isc (kA)

4

6,25

8

Shock (peak) nominal current for t = 0,02 s Isd (kA)

10

15,63

20

Test short-circuit current for t = 1 s (kA)

4,6

7,2

9,2

Test (shock) peak current for t = 0,02 s (kA)

11,5

17,97

23

Power factor (according SR EN 61230)

2,5

Length of  phase cable lf (m)

max. 4

Length of earthing cable lp  (m)

max. 15

Diameter of the conductor where the phase clamp can be applied (mm)

5 – 32

Components:

  • Self-locking automatic clamp (CAA) – 3 pieces
  • Earthing cable – 3 pieces
  • Manual earthing clamp – 1 piece
  • Mounting adapter (AM/C) – 1 piece
  • Removal hook (CDA/C) – 1 piece
  • Mobile earthing electrode (peg) – 1 piece