Short-circuiting (earthing) equipment VHV 420 kV – for conductors 70 – 100 mm

Type: 811.420

Models: 811.420 – 10 (15)

The short-circuiting (earthing) equipment is designed  for short-circuit making and earthing of the circuit in networks with an earthed  node of the nominal voltage of up to 400 kV. The short-circuiting set consists of three insulating poles ended fixed with conductor clamps for the attachment to conductor of circular cross section up to 100 mm in diameter, one supporting pole and three short-circuiting cables ended with universal earthing clamps. Conductor clamps are connected to earthing clamps by Cu cables in transparent isolation. Insulating pole is made of glass-fabric laminate which is suitable for its high electrical and mechanical resistance and stability. Pole consists of three pieces connected by means of connecting element. It fulfills the requirements on the protection equipment for outdoor use. The set is determined for outdoor use under normal climatic conditions. The handle is provided with the protecting ring (hand guard). Short-circuiting set complies with standards ČSN EN 61230 ed.2, IEC 61230, DIN 46235. It is produced in two models for various shorttime withstanding current. It is possible to modify the model at the custom’s request.


Documentation 811.420EN download


Short-cirtuited conductor: circular cross section 70-100 mm
Rated short-time withstanding current: 10 (15) kA / 1 s
Peak factor: 2.5
Length of pole: 6 000 mm (3×2000 mm)
Length of handle: 1 500 mm
Pole diameter: 47 mm
Cross section of cable: 50 (70) mm2
Length of cable: 9 000 mm
Length of supporting pole handle: 2 000 mm
Length of supporting pole handle: 600 mm
Supporting pole diameter: 39 mm
Tightening of clamps: 12 Nm
Weight of equipment: 34 (38) kg
Pole material: glass-fabric laminate for outdoor use
Climatic group: normal -25°C to +55°C