Application: from the ground, by hanging the phase clamp on the round section conductor, followed by the tightening of the clamp driving screw.
Classic / automatic phase clamps must be handled using an insulating stick according to the voltage of the installation, provided with “RO bayonet’’ coupling system.
Constructive phase clamps:
- Classic Universal Clamp (CCU)
- Automatic clamp (CA)
- Lightweight classic universal transversal clamp (CCTU/E)*
* The short-circuiting device equiped with CCTU clamp cannot be used on fixed ”T” coupling
Components:
- Phase clamp – 1 piece
- Earthing cable – 1 piece
- Earthing clamp – 1 piece
Packing: waterproof bag.
Other equipment to be used in conjunction:
– connecting insulating stick type PMU 110-2 B/ba / PMU 220-2 B/ba / PMU 400-3 B/ba
Tips: considering the inclined position from the ground and at the height of conductors in transformer stations, we firmly recommend the permanent mounting on such conductors of ‘’T’’ fixed couplings or other round cross-section parts to provide ergonomic conditions for the mounting of the phase clamp of the short-circuting device.
| General technical characteristics of short-circuiting devices applicable on rectangular cross-section bars | |||||||
| Earthing cable cross-section Sp (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 universal clamp (CCU) | Automatic clamp (CA) | Lightweight Classic Universal Transversal Clamp (CCTU) |
| Diameter of the conductor where the phase clamp can be applied ØD | 9÷32 | 17÷32 | 3÷45 |
| Maximum length of the earthing cable lp (m) | |||
| cable with a cross-section of 16 to 70 mm2 | 10 | 17,5 | 10 |
| cable with a cross-section of 95 or 120 mm2 | 10 | 8 | 10 |
Components:
- Phase clamp - 1 piece
- Earthing cable – 1 piece
- Manual earthing clamp – 1 piece
Constructive types of phase clamps:
- Classic reduced clamp (Cr)
- Automatic clamp (CA)
