METROSIL
Discharge resistors Metrosil Voltage Dependant Resistors
(Varistors), or Non-linear Resistors, are predominantly
based on silicon carbide. They are used to discharge
generator excitation fields while limiting the voltage
to an acceptable level.
Two types are available.
For low discharge currents (less than 600 Amps)
and suitable field and discharge voltages, it
is possible to supply a METROSIL which can be
connected directly across the field at all times.
For higher currents
the Metrosil Discharge Resistor is switched into
the circuit just before the excitation field current
is interrupted. This enables the use of higher current
rated Metrosils.
Both types are supplied as assemblies
of 150mm diameter discs, electrically connected in parallel.
The number of discs and their thickness depends on the
application details.
Engineering assistance:
On receipt of the following information we will recommend
a suitable Metrosil Discharge Varistor.
