KVA Distribution - Products Overview
CAPACITOR TYPES-High Voltage, High Power
Smoothing or filtering Capacitors
Smoothing capacitors are used to reduce the AC component of pulsating DC voltage.
DC link circuit Capacitors
These capacitors support a DC network by briefly supplying high currents when there is a periodic peak current requirement. They are periodically and abruptly charged and discharged. These capacitors are designed for a high thermal rating in order to handle the relatively high reactive power and power dissipation. Capacitors with especially low inductances are used in the DC link circuits of inverters (GTO, IGBT or thyristor controllers for DC and three-phase drives).
GTO (gate turn off) clamping Capacitors
Especially powerful GTO inverters for high-speed railways as well as industrial inverters call for special circuit designs to minimize switching losses. Besides snubber capacitors for protecting semiconductor devices, clamping capacitors are used, which reduce switching losses to a minimum.
Series resonant circuit Capacitors
Series resonant circuit capacitors are DC capacitors which may have very high superimposed AC voltages of purely sinusoidal form. They are configured in series with inductors and filter the harmonic components that are still present after rectification. Series resonant circuit capacitors must be designed for very high reactive power, not produce partial discharges and be scaled for high thermal stress. This type of capacitor is used in high-power industrial and traction inverters.
Discharge capacitors are DC capacitors that absorb or supply strong current surges. They are charged sporadically and briefly discharged. Discharge capacitors are subjected to high loads such as high field strength, large peak currents because of the fast discharge, generating considerable mechanical forces in large capacitors, high AC voltages on inductive loads as a result of overshoot. They are typically used for generating strong magnetic fields, high-energy light flashes, high temperatures and extremely high pulses of electrical energy.
General AC application Capacitors
AC capacitors are suitable for general-purpose applications. They are also used with non-sinusoidal voltages and currents. They are generally used in resonant circuits, for filtering in magnetic voltage stabilizers at line frequency, and commutating capacitors in power inverters.
Coupling capacitors transfer information between equipment parts on different potentials (e.g. connection between control and power electronics). The load on the capacitors is primarily due to the voltage difference between the two equipment parts. The signal voltages to be transferred are much less of a load for the capacitor. The coupling capacitor must also prevent current flow between the equipment parts under all unspecified operating conditions.
Commutating AC capacitors are periodically and abruptly charged and discharged, the peak value of the current that occurs being substantially greater than the rms figure. Commutating capacitors are mainly subjected to high reactive power and peak current. A decisive factor is the ring-around time. At high ring-around frequencies (10 … 100 kHz) the capacitor must still exhibit a purely capacitive reactance, i.e. it must be low-inductance in design.
Damping AC capacitors are connected in parallel with components to suppress or damp undesirable voltage spikes. Damping capacitors are abruptly charged and/or discharged, the peak value of the current that occurs being substantially greater than the rms figure. In addition to sinusoidal halfwave voltage, damping capacitors carry periodic voltage peaks from the hole-storage effect, and harmonic components from phase controls. They require high dielectric strength and peak-current capability along with high reliability.
GTO Snubbering (gate turn off) and Snubbering Capacitors
Low-inductance snubber capacitors are connected in parallel with GTO thyristors to limit the rate of rise of their repetitive reverse voltage. These capacitors are periodically and abruptly charged and discharged, whereby the peak value of the current reaches extremely high values. The rms current is also significantly higher than the loads of conventional snubber capacitors, because this capacitor must briefly carry the entire load current. Therefore especially low-inductance capacitor design is important. Snubbering capacitors are used for rectifier circuits in conjunction with IGBT’s where bi-directional voltages are experienced. Both types are designed to meet the needs of the traction industry as well as for static drive applications.
Power Factor Correction and Filtering Capacitors & Accessories.
These are parallel AC capacitors for improving the power factor (cos phi) in electrical power installations. They keep reactive current components - produced by inductive loads - away from power-generating and power-transmission installations. Capacitors for reactive-current compensation must also sustain surge voltages from the line that are produced when inductive loads are turned off. These AC capacitors are also suited for usage in harmonics filter circuits in applications such as UPS systems, turbine generators (i.e. wind energy), and any kind of big inverters and drives. The capacitor in series with a filter circuit reactor forms a series resonance circuit which protects the equipment from resonance conditions and improves power quality by absorbing a certain amount of harmonic currents. Power factor correction accessories such as contactors and controllers are available to monitor and maintain steady non-reactive circuits as differing load strengths are switch in or out.
POWER RESISTOR TYPES
Coiled Wire Power Resistors
These Resistors are used in conjunction with appropriate control equipment to accelerate, dynamic braking of motors. They are suited for use in the secondary of AC wound rotor motors for accelerating speed regulating services. Coiled Resistors are used as Neutral Grounding Resistors, AC and DC dynamic braking load banks, current limiting and blast for mercury vapor lamp.
Fixed & Adjustable Type Wirewound Resistors
These types of robust resistors are wound with Copper Nickel or Nickel Chromium on a ceramic tube and then coated with a high temperature non-flammable substance. These resistors are suitable as loading resistors, braking resistors, capacitor discharge & many more applications.
Carbon Ceramic Composition Resistors
These types of power resistors provide pulse capabilities unmatched by wirewound or film resistors. The manufacturing process enables customized rod or disk sizes up to 5” diameter and 18” long. Typical applications include snubber circuits, lightning surge, grounding resistors, RFI suppression, dummy loads, etc.
Power Film Resistors
These types of resistors are designed for high voltage and/or high power applications. Film construction has extremely low reactance enabling superior high-frequency performance. The insulation is resistant to moisture, solvents, and oil mediums. The combination of high power and high voltage provides new opportunities for design engineers to obtain the utmost in performance, without the need to assemble chains of resistors in series.
These types of resistors are designed to meet heavy-duty requirements where space is at a premium. A ribbon element is edgewound onto a ceramic tube providing very high power ratings at a low cost. Inductance levels are lower than conventional round-wire designs. These are best suited for load testing, power distribution, high power instrumentation, etc. Usually with a power rating of: from 75 watts to 2000 watts.
POWER SWITCH TYPES
These types of switches utilize an electromagnet to provide undervoltage/blackout protection and is used primarily on industrial devices. Options for these switches include water protection, bezel styles, and remote trip for use with emergency stop switches.
Pushbutton switches are available in almost every shape and size. They are produced for high or low amperage applications. They are available waterproof, illuminated, panel or PC board mounting, and up to 4 poles and 2 throws.
These types of switches are produced in many cutouts and for almost every commercial/industrial application. These switches are rated up to 20A at 277VAC.They are offered in sealed, illuminated, and with panel or PC board mountings.
These robust switches are designed for high loads and easy actuation for industrial applications. There are a variety of body styles, many actuator shapes (including soft grip plastics), one speed or variable speed options, reversing levers, and thumb locks for lock-on or lock-off operation.
With the key engaged, these switches act exactly like a normal switch, but with the key removed the switch will not activate. This is a handy feature for industrial applications. The actuator types vary to suit the needs of the application
POWER INDUCTOR/CHOKE TYPES
Power Inductors for tuned circuits
Inductors used in conjunction with capacitors and other components can form tuned circuits which emphasize or filter out specific signal frequencies. An application may be a large inductor in a power supply, which in conjunction with a filter capacitor remove residual hums known as the Mains him or other fluctuations from the direct current output. Also they are used in power regulators and converters.
Power Inductors for energy storage
An Inductor is used as the energy storage device in some switched-mode power supplies. The inductor is energized for a specific fraction of the regulator’s switching frequency, and de-energized for the remainder of the cycle. Frequency is a key parameter.
Power Inductors for distribution systems.
Inductors may be employed in electrical transmission systems, where they are used to depress voltages from high voltage interference factors and to limit switching currents and fault current.
Inductance, current and frequency requirements, as well as the mounting style, aid in the selection of the appropriate power inductor. Although a few applications are able to use open construction, the majority of applications are best served with encapsulated power inductors.
Electric Vehicle Infra Charging Connectors
Distributing both the Yazaki J1772 and CHAdeMO charge couplers and vehicle inlets. Excellent design options for new vehicles and conversion and retro fit solutions.
High Vehicle Infra Charging Connectors
Distributing Anderson Power Products, a manufacturer of high current, quick disconnect power connectors provides a myriad of solutions to material handling, power electronics, medical and other industries. Product families are rated as high as 700 amp. Power Clip mates with Bus bar and is rated to 300 amp. Saf-D-Grid series is touch safe, fits IEC230 C14 Inlets and has DC Arc containment. The SPEC Pak sealed connectors are IP68 and are rated to 310amps.