Over the past 45 years, Kinetics
has designed and manufactured various
types of power rectifiers for traction
test applications that include both
power and electronic loads. Kinetics’
engineers will use our extensive application
experience to work with an application’s
specifications for the design and
manufacture of a testing unit that
provides the optimum power system
for a customer’s application.
A traction test system is defined
as a rectifier with a DC output voltage
above 400 VDC to a maximum of 4,500
VDC. (Kinetics manufactures only air-cooled
systems) A Kinetics test system includes
the required OSHA designated safety
features for testing power supplies
as a minimum for operator interface.
Kinetics has established three basic
types of traction rectifiers to match
with the most commonly requested test
power systems.
Fixed voltage output:
The model type CVR is a full wave,
constant potential, fixed voltage
output, diode rectifier. A fixed voltage
unit provides either zero or full
voltage to the load. The voltage can
only be adjusted by changing transformer
taps while the unit is off line, de-energized.
The diode output "ripple"
to the load is a fixed value. Units
are available in 6, 12 and 24 pulse
systems. This unit is commonly applied
to "complete" rail car power
testing where a fixed rail bus power
into the load is desired. A typical
CVR unit includes; AC circuit breaker,
isolation transformer, diode rectifier
bridge, robust AC & DC surge suppression
and a heavy industrial, convection
cooled, enclosure.
Adjustable voltage output:
The model type AVR is a full wave,
constant potential, diode rectifier,
with a motorized auto-transformer
feeding into the primary of the diode
rectifier bridge. The AVR system provides
infinitely variable DC output from
0 to 100% volts with full current
capacity through the entire operating
range. The rectifier output, semi-conductor
ripple, is a constant value throughout
the entire operating range. The speed
of voltage adjustment, stability response
and output regulation to a selected
voltage set point, is determined by
the rate of response of the servo-motor
driven adjustable auto-transformer.
This unit is typically applied to
applications requiring low or constant
ripple through a wide voltage testing
range. The model AVR commonly used
to test rail car electronics, inverters
or chopper drives where semi-conductor
ripple interaction between the rectifier
and load could be a problem.
Regulated voltage output:
The model type SVR is a heavy industrial
duty, solid state, closed feedback
loop, phase shifted, infinitely variable
regulated output, semi-conductor DC
power supply for general power distribution
loads. DC output voltage is, electronically,
regulated within +/1% with a 50 millisecond
response time per IEEE standard 421A
for regulated rectifiers. The model
SVR using SCRs with firing circuitry
for variable DC output is less expense
then a motor driven auto-transformer.
When applying the model SVR, users
should review the technical requirement
of the load for suitability to handle
semi-conductor ripple. Ripple filtering
networks are an available option.
SVR units are designed and manufactured
for the highly demanding application
of transit power testing applications.
A standard system includes; AC input
circuit breaker, isolation transformer,
regulated semi-conductor bridge, robust
AC and DC surge suppression, OSHA
safety features for operation &
annunciation and a heavy industrial
convection cooled enclosure.
Common safety & operational features
for transit testing rectifiers and
power supplies:
- Two-redundant - DC power on indication
lights.
- DC output fusing.
- AC main line contactor with 120
VAC control coil.
- Zero voltage pass after a time
interval trip circuit – prevents
test leads from mistakenly being
left energized.
- Two sided access enclosure segregated,
high vs. low voltage compartments.
- Input and / or output cables with
storage hangers.
- Four, heavy industrial duty, enclosure
casters with lockable wheels.
- Warning horn and adjustable time
delay prior to DC power turning
on protective circuit.
- Local / remote mode of operation
selection.
- Remote from power supply unit,
operation station.
- Many other customizing features
available upon request.
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