Electrical
Inductance
Specify the required inductance to ensure proper filtering, energy storage, or current limiting performance. QT&E designs inductors from low microhenries to high millihenries.
ex. 10 mH ±5% for a DC choke application.
Current Rating
Define the maximum continuous and peak current the inductor or reactor must handle to prevent saturation or overheating.
ex. 100A continuous, 150A peak for 1 second.
Voltage Rating
Specify the voltage levels the inductor will operate at to ensure proper insulation and breakdown protection.
ex. 600V AC for an input line reactor.
Frequency Range
Define the operating frequency to ensure optimal performance for filtering, impedance control, or power conversion.
ex. 60 Hz for a line reactor, 20 kHz for a switching power supply inductor.
DC Resistance (DCR)
Specify the maximum allowable resistance to minimize energy loss and heat generation.
ex. DCR < 5 mΩ for low-loss applications.
Impedance at Frequency
Indicate the impedance value at a specific frequency to ensure proper filtering and resonance characteristics.
ex. 500Ω at 100 kHz for an EMI filter choke.
Saturation Current
Specify the maximum current before core saturation occurs to ensure consistent inductance under load.
ex. 200A saturation current for a high-power inverter inductor.
Harmonic Mitigation
Indicate if the inductor/reactor needs to reduce harmonics in power systems to improve power quality.
ex. 3% impedance line reactor for harmonic mitigation in a VFD system.
Noise Suppression (EMI/RFI Filtering)
Define attenuation requirements for suppressing electromagnetic interference in power circuits.
ex. 30 dB attenuation at 150 kHz to meet IEC 61000-6-3 EMI standards.
Saturation Current
Specify the maximum current before core saturation occurs to ensure consistent inductance under load.
ex. 200A saturation current for a high-power inverter inductor.
Isolation
Specify isolation requirements to ensure safety and signal integrity. ex. 4 kV isolation voltage. QT&E supports:
5 kV standard
5 kV up to 200 kV (custom)
Inrush
Detail any limitations on inrush current for your application; QT&E designs transformers with low inrush or soft-start options. ex. 5x full-load current for 10 milliseconds
Impedance
State the desired impedance to control voltage regulation and fault currents; QT&E provides custom designs to meet specific impedance values. ex. 4% (typical range: 2% to 8%)
K-rating
Specify a K-factor to handle harmonic loads. ex. K-13 (designed for harmonic loads in data centers). QT&E supports:
K-1 (standard)
K-4, K-13, K-20 for data centers and other sensitive applications
Short-circuit strength
Define the fault tolerance requirements; QT&E designs transformers to withstand high fault currents up to 100 kA. ex. Withstands 25 kA for 1 second
Efficiency Standard
Choose an efficiency standard (e.g., DOE 2016, NEMA Premium); QT&E ensures compliance with the highest energy efficiency benchmarks. ex. NEMA TP-1 or DOE 2016 Compliant
Noise suppression
Indicate the need for minimizing audible or electrical noise; QT&E incorporates low-noise laminations and shielding for sensitive environments. ex. 40 dB attenuation at 1 kHz
Ground loop elimination
State requirements for reducing ground loops in your system; QT&E designs with specialized grounding and isolation techniques. ex. Floating secondary with ground shield
Shielding
Specify electromagnetic or electrostatic shielding to prevent interference; QT&E offers designs with custom shielding options. ex. Faraday shield with 90% attenuation
Low Leakage Current
Define acceptable leakage current levels for safety or regulatory compliance; QT&E produces designs with minimized leakage current. ex. < 300 μA
Phase Angle Control
Indicate if phase-angle adjustments are needed for precise control; QT&E designs transformers optimized for phase control applications. ex. ±5° phase shift between primary and secondary
Harmonic Mitigation
Specify harmonic reduction needs to improve power quality; QT&E provides designs with specialized cores and K-rated transformers. ex. Reduces THD to <5%
Load Balancing
Describe requirements for balancing loads across phases; QT&E offers solutions to improve phase balance in single- or three-phase systems. ex. ±3% balance between phases
Voltage Regulation
Indicate tolerance for voltage fluctuations; QT&E ensures precise regulation through advanced winding and core designs. ex. ±1% under varying loads
DC Ripple Management
Define your tolerance for DC ripple in rectified outputs; QT&E designs for low ripple with advanced filtering. ex. Ripple voltage <1% of DC output
Pulse Shape Fidelity
Specify the need for high-fidelity pulse shaping in applications like power supplies or amplifiers; QT&E delivers precise waveform reproduction. ex. Rise time <50 nanoseconds with minimal overshoot
Fast Rise Times
Detail the requirement for rapid voltage or current transitions; QT&E provides solutions optimized for high-speed applications. ex. 10 microseconds from 10% to 90% of final value
Mechanical
Cooling Method
Define the preferred cooling approach—natural convection, forced air, or liquid-cooled—based on power dissipation requirements.
ex. Forced-air cooling with external fan for high-current reactor.
Dimensions
Transformer and enclosure dimensions define the physical size and footprint, ensuring proper fit and cooling in the installation space.
Terminal Configuration
How do you plan to connect to your transformer? We support:
Copper buss bar
Silicon bronze hardware
Terminal strip
Ring-lug compatibility
Touch-safe configurations
Lexan covers
Seismic Kit
Seismic kits reinforce transformers to meet structural requirements, ensuring stability and functionality during seismic events.
Circuit Protection
Specify integrated circuit protection needs, such as fuses or breakers, for overload and fault conditions. ex. Primary & Secondary circuit breakers. Options include:
Circuit breakers
Fuses
Seismic Kits
Indicate if seismic bracing is needed to meet building codes in earthquake-prone areas. ex. Designed for Zone 4 seismic compliance
Emergency Off and Safety
Define any emergency stop or safety requirements, such as accessible shutoff switches or interlocks. ex. Red emergency-off push button on front panel
Cooling Method
Specify the cooling method required, such as natural convection, forced air, or liquid cooling, based on operating environment and power density. ex. Forced air cooling with fans or Liquid-cooled system
Voltage Tap Changers
Specify if adjustable voltage taps are needed to fine-tune output voltage under varying input conditions. ex. voltage tap changer for ±5% taps on primary winding in 2.5% increments
Notifications
Define any notification features required, such as indicator lights, alarms, or digital displays for system status. ex. Green (Power On), Red (Fault) indicator lights with an audible alarm for overload
