Single-phased earthing device for round conductors

Single-phased earthing device for round conductors

   

Code: Msp – Cr – Sp/lp – O
           Msp – CA – Sp/lp – O/p 
           Msp – CAU – Sp/lp – S/O/P/p

The single-phased earthing device is utilized  on round conductors in HV/MV substations.
The phase clamp can be classic reduced (Cr), automatic (CA) or universal automatic (CAU).

The Cr classic reduced clamp and the CAU universal automatic clamp have an extruded aluminum alloy body, the CA automatic clamp contains a molded body made of aluminum alloy, all the clamps having a tightening screw provided at the end with a bayonet coupling system for the connection with the insulating sticks.    

The earthing is made with the manual earthing clamp.

 The single-phased earthing device is delivered in sets of 3 pieces in a transport bag / case. 

General characteristics for the single-phased earthing devices for round conductors

Earthing cable section Sp (mm2)

16

25

35

50

70

95

120

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

3,5

6

8

12

16

20

30

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

8,75

15

20

30

40

50

75

Testing shortcircuiting current for t = 1s (kA)

4,6

6,9

9,2

13,8

18,4

23

34,5

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

11,5

17,25

23

34,5

46

57,5

86,25

Maximum length of the earthing cable lp (m) – classic reduced clamp (Cr)

17,5

17,5

17,5

17,5

17,5

10

10

Maximum length of the earthing cable lp (m) – automatic clamp (CA)

 8

 Maximum length of the earthing cable lp (m) – universal automatic clamp (CAU)

 10

 Peak factor (SR EN 61230)

 2,5

 

Type of phase clamp

Classic reduced
clamp (Cr)

Automatic
clamp (CA)

Universal automatic
clamp (CAU)

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

17 ÷ 32

17 ÷ 32

9 ÷ 32

The  single-phased earthing device is composed of:
     – Phase clamp – 1 piece
     – Earthing cable  – 1 piece
     – Earthing clamp – 1 piece