Electrical
Frequency
Define the operating frequency of your system (e.g., 50 Hz, 60 Hz, or custom). ex. 60 Hz. QT&E supports frequencies from:
50 Hz or 60 Hz
400 up to 20 kHz
Phases
Choose between single-phase or three-phase configurations to match your application requirements; QT&E designs for both types. ex. 3PH.
Single-phase
Three-phase
Inputs & Outputs
Indicate the number, voltage, and current ratings for primary and secondary windings; QT&E accommodates a wide range of configurations and load profiles. ex. Input: 480V, Output: 120/240V split-phase.
Up to 600 V
Isolation
Specify isolation requirements to ensure safety and signal integrity. ex. 4 kV isolation voltage. QT&E supports:
5 kV standard
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-1 (standard K-rating). 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
Mechanical
Temperature Rise
Specify the allowable temperature rise above ambient for your application (measured in °C), typically based on insulation class or operational needs. ex. 80°C (standard for Class B).
Dimensions
Define the physical size constraints (height, width, depth) to fit your installation space. ex. H: 24 in, W: 18 in, D: 12 in
Terminal Configuration
Specify the type of terminals required, including material (e.g., copper or aluminum), plating, and configuration (e.g., screw, stud, or busbar) based on conductivity and installation needs. ex. Tin-plated copper busbars with 3/8-inch studs. Options include:
Copper buss bar
Silicon bronze hardware
Terminal strip
Ring-lug compatibility
Touch-safe configurations
Lexan covers
Enclosure
Indicate the required enclosure type based on environmental conditions, such as indoor, outdoor, or hazardous locations. ex. NEMA 1 (indoor use). Options include:
NEMA 1: Standard
NEMA 2
NEMA 3 + 3R: Protection from falling water.
NEMA 4 + 4X: Water proof, fully enclosed.
NEMA 6
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
