VAN DE GRAAFF GENERATOR Description and Specifications for Lab Tenders
VAN DE GRAAFF GENERATOR.
VAN DE GRAAFF GENERATOR This type of generator consists of a belt of insulating material
stretched between two pulleys and kept in rotation by a motor.
This belt is charged by induction by a row of metallic points
(point effect) available near one of the pulleys and connected
with a DC voltage generator (e.g. : a battery).
Then these charges are transferred by the motor into an
insulated conductor of spherical shape where a second comb
connected electrically with the sphere transfers them onto
the surface of the same sphere. If the machine is not switched
off, this process will stop when the voltage of the sphere is
sufficient to generate electric discharges across the supporting
insulators (dielectric breakdown) or across the surrounding air
(air ionization).
This generator has been designed for tests in the sector of
electrostatics and where high-voltage direct sources are
necessary. It is mounted on a base with AC motor running at
220 V and 50 Hz.
TECHNICAL CHARACTERISTICS
• Charge collecting belt of silicone rubber with high insulation
resistance
• Charge collecting combs of aluminium
• Spheres of aluminium, with diameter of 150 mm
• Connections: sockets of 4 mm
• Output voltage: up to 200 kV, according to environmental
conditions
• Static discharger: spherical, with diameter of 100 mm,
insulated handle and sockets of 4 mm.
Set of accessories for Van De Graaf generator
These accessories can be inserted into the sockets of 4 mm
available on the top pf the sphere.
Pillar with suspended sphere of metal, cylinder of perspex with
metallic plugs, 4 spheres of metal.