HV Caps Applications
Morgan Electro
Ceramic is a leader in the design and manufacture of
advanced ceramic products with over 50 years experience in
the manufacture of electroceramic materials and components
for high voltage applications.
Live-Line
Indication
To indicate the presence of voltage and for fault
detection on power frequency high voltage distribution
switchgear (6.6kV-36kV systems).
The
capacitor is connected directly to the HV line and a small
current (low voltage signal) is passed which illuminates a
neon lamp mounted on the front panel of the switch.
Alternatively
the low voltage signal may be used to feed a sensing circuit
which monitors for supply failure and circuit condition.
The
capacitor is normally contained within a resin moulding.
Usually the moulding is made by the switch manufacturers
themselves in a shape to suit their own particular needs but
Morgan Electro Ceramics can offer certain complete mouldings
or can advise on suitable sources.
Electrostatic
Spray Guns
- dry powder paint spraying in automotive white goods or any
other metal products requiring smooth uniform paint finish.
High
Voltages can be produced from a relatively low voltage AC
source using a Voltage Multiplier Assembly i.e. parallel
stacks of series connected capacitors and cross connected
diodes. These devices find their major application in
electrostatic paint spraying equipment.
DC
output voltages in excess of 100kV generate a corona
discharge at the end of the spray gun and the resulting HV
electric field causes the surrounding air to break down
creating negatively charged ions. The ions attach themselves
to the nearest object or surface and the particles of paint
powder passing through this field become charged then
attracted to the earthed workpiece.
The
capacitor stack assembly consists of a number of series
connected capacitor discs with a choice of intermediate
metal fittings to which the diodes are attached.
A wide
range of stacks of up to 12 discs in series are available
with voltage ratings of the individual discs from 8 to 12kV
DC and capacitance values from 125pF to 100OpF.
Their
compact size, low weight and ability to withstand the high
voltages generated are the main reasons why these assemblies
are used.
DC Power
supplies
Encapsulated
High Voltage capacitor discs of the type shown can be used
in voltage multiplier circuits for high voltage low power DC
supplies such as those used in Medical scanners, X-Ray
equipment and electrostatic precipitators.
Parallel
strings of series connected capacitors with cross-connected
diodes can be used in the multiplier circuit.
The
equipment is usually non-portable and made up of large
capacitance units - typically 150OpF upwards with voltage
ratings of 20 to 40W.
You
may also find the following sections of particular interest
if you are associated with HV applications:-
Capacitors Tutorial and Guides
RF Power Capacitor Applications
Capacitors Product Range
Voltage Multipliers
Live Line Units
|
