Single-phase short-circuiting device for rectangular cross-section bars

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SKU: Msp - C - Sp/lp - P/p , Msp - CA - Sp/lp - P/p
Category:

Intended use: earthing of rectangular cross-section bars in transformer stations: flat bars, bar packets or busbars of various thicknesses.

Application: by the application of the phase clamps on the rectangular section bar, followed by the tightening of the clamp actuator screw.

Classic / automatic phase clamps must be handled using an insulating stick according to the installation, provided with ‘’RO bayonet’’ coupling system.

Constructive types of phase clamps:

  • Classic clamp
  • Automatic clamp (CA)

Components:

The single-phase short-circuiting device includes the following components:

  • Phase clamp – 1 piece
  • Earthing cable – 1 piece
  • Manual earthing clamp – 1 piece

Packing: waterproof bag.

Other equipment to be used in conjuction:

– connecting insulating stick type PMU 20-1 B/ba / PMU 110-2 B/ba

General technical characteristics of short-circuiting devices applicable on rectangular cross-section bars
Earthing Sp cable cable cross-section (mm2) 16 25 35 50 70 95 120
Nominal short-circuit current for t = 1s Isc (kA) 4 6.25 8.75 12.5 17.5 23.75 30
Shock (peak) nominal current for t = 0,02 s Isd (kA) 10 15.63 21.9 31.25 43.75 59.38 75
Test short-circuit current for t = 1s (kA) 4.6 7.2 10.06 14.38 20.13 27.31 34.5
Test (shock) current for t = 0,02 s (kA) 11.5 17.97 25.16 35.94 50.31 68.3 86.25
Power factor (according to SR EN 61230) 2.5

 

Phase clamp type  Classic clamp (C) Automatic clamp (CA)
Length of phase cables – single  short-circuiting device lp (m) max. 8.5 max. 8.5
Thickness of the flat bar where the phase clamp g can be mounted (mm) max. 40 max. 37

The single-phase short-circuiting device includes the following components:

  • Phase clamp – 1 piece
  • Earthing cable – 1 piece
  • Manual earthing clamp – 1 piece

Constructive types of phase clamps:

  • Classic clamp
  • Automatic clamp (CA)