Single phase earthing device for HV overhead lines – CAA phase clamp

Single phase earthing device for HV overhead lines - CAA phase clamp


Category:

 

Code: Msp CAA – S  /l  – O/p  

The single phase earthing device provided with automatic self-locking phase clamp (CAA) can be applied from the pillar, on the HV 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.

Before the setting up of the CAA clamp, a special applicator must be fixed on the bayonet coupling system of the stick, then the phase clamp must be attached to this applicator (please see the picture).

The fastening of the phase clamp is performed by its pushing downward, on conductor. The removal of the phase clamp could be performed using same equipment (insulating stick with special applicator) by hooking and pulling upward the steel ring of the phase clamp.
For this procedure, it is recommended to use an appropriate connectable insulating sticks PMU-Un-n-B/ba.

Usually, this kind of earthing device is provided with special earthing clamp with scraping system (clamp with scraping die) for painted metallic pillars (in order to remove the paint and oxides layers).

Technical characteristics

Earthing cable section S(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

Maximum length of the earthing cable  lp  (m)

max. 17,5

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

5 ÷ 32

6 ÷ 32

This equipment contains the following components:
– Automatic self-locking phase clamp (CAA) – 1 piece
– Earthing cable – 1 piece
– Earthing clamp (scraping or normal) – 1 piece
– Special applicator – 1 piece/set of three earthing devices

This equipment is delivered in sets of three pieces, in a carrying bag or a transport case.