QPS series of Motor starting Auto -Transformer is specifically designed to limit the inrush current at the time of motor starting. It allows the motor to start at reduced voltage with moderate starting torque.
QPS motor starting Auto-transformers are typically designed with voltage taps of 50%, 60% and 75% of the rated voltage.
The motor is connected to the taps of the auto-transformer during the reduced voltage starting period. With lower starting voltage, less current is drawn by the motor, which therefore develops less torque then if it were connected to the line voltage.
Motor with auto-transformers provides a safe and effective start-up., and the design are compact, mechanical strong and price favourable.
Designed and tested according to EN61558 and IEC 60076, the motor starting auto-transformers can be supplied with temperature limiting switches and protective enclosure with relevant degree of protection upon request.
CAPACITY
Up to 1500kW
RATED FREQUENCY
50Hertz or 60Hertz
RESTART FREQUENCIES
Maximun re-start frequencies of 8 times per hour @ 4 second per start
Optional restart frequencies at appropriate intervals
RATED VOLTAGE
Up to 1000v
INSULATION CLASSIFICATION
Class F & H
Others upon request
REFERENCE STANDARD
IEC 60076
IEC 61558
TRANSFORMER CORE MATERIAL
High grade electrical steel
WINDING CONDUCTORS
Copper or Aluminium wire
Copper or Aluminium foils
OPTIONAL ACCESSORIES / DESIGN
Enclosures up to IP54
Temperature limiting swithces
TAPPING
Single tapping @ 70%
Three tapping @ 50%, 60% and 75%
AMBIENT TEMPERATURE
40oC
Others upon request