Three phase earthing device for MV overhead lines-application from height


Category:

 

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

The three phase earthing device provided with automatic self-locking phase clamps (CAA) can be applied from height on MV overhead lines.

The main parts of the phase clamp are made by casting from aluminium alloy. This clamp (CAA) is provided with a special coupling system for setting up on conductor and a steel ring for removal from conductor. The new coupling system allows easy and safe mounting of the clamp on the applicator. This system avoid an accidental detachment of the clamp and assures a simultaneously detachment of the clamp from the applicator along with its fastening on conductor.

The operation should be performed from the pillar using a short telescopic / connectable insulating stick. Before the setting up of the CAA clamps, an appropriate applicator must be fixed on the hexagonal / bayonet coupling system of the stick, then the phase clamps must be attached to this applicator. The fastening of the phase clamp on conductor is performed by hooking and pulling downward of the clamp. The removal of the phase clamp could be performed by hooking and pulling downward the steel ring of the phase clamp. At the removal operation, an insulating stick with removal hook should be used.

Technical characteristics

Earthing Sand short-circuiting Sf  cable sections  (mm2)

16

25

35

50

70

95

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

4

6

8

12

16

18

Nominal peak currrent for t = 0,02 s 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 l(m)

max. 15

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

5÷32

6÷32

This equipment contains following components:
– Automatic self-locking phase clamps (CAA) – 3 pieces
– Phase (short-circuiting) cables – 3 pieces
– Earthing cable – 1 piece
– Earthing clamp – 1 piece
– Earthing rod – 1 piece
– Applicator – 1 piece
– Removal hook – 1 piece

This equipment is delivered in a carrying bag or a transport case.