Three phase earthing device for MV overhead lines-application from height - CAA phase clamp fixed on insulating telescopic stick


Category:

 

Code: Msp – CAA – AST – 3xSf/lf – Sp/lp – O/p – T  

The three phase earthing device provided with automatic self-locking phase clamps (CAA) fixed on telescopic insulating sticks can be applied from height on MV overhead lines.
The main parts of the phase clamp are made by casting from aluminium alloy.
The phase clamp is fixed on the end of insulating stick (made of fiberglass).

The fastening of the phase clamp on conductor is performed by hooking and pulling downward of the clamp.
The removal of the phase clamp is performed by pushing and vertical twisting of the insulating stick.

Technical characteristics

Earthing Sand short-circuiting Sf  cable sections  (mm2)

16

25

35

50

70

95

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

4

6

8

12

16

18

Nominal peak currrent for t=0,02s Isd (kA)

10

15

20

30

40

45

Testing short-circuiting current for t = 1s Itest (kA)

4,6

6,9

9,2

13,8

18,4

20,7

Testing peak current for t = 0,02 s Ipeak (kA)

11,5

17,25

23

34,5

46

51,75

Peak factor (SR EN 61230)

2,5

Short-circuiting cable length lf  (m)

max. 2,5

Earthing cable length lp  (m)

max. 15

Conductor diameter on which the clamp can be applied (mm)

5÷32

6÷32

Insulated stick -Total length Lt / Useful length Lu (m)

1,55 / 1,14

The three-phased short-circuiting device contains:
– automatic self-locking phase clamp (CAA) – with telescopic insulating stick – 3 pieces;
– short-circuiting cables – 3 pieces;
– manual earthing clamp – 1 piece;
– earthing cable – 1 piece;
– earthing rod – 1 piece;

The short-circuiting device is delivered in a metalic box (1030 x 300 x 160 mm).