Page 26 - Electro Wind Catalogue 2023

Case Studies
Aircraft Research Association Ltd. 12 pulse Hexaphase transformer & IBR Upgrade to drive system on Transonic Wind Tunnel.
Part A – Specification Data
Part A – Specification Data
Input volts (on-load) 11000V 3ph (3 wire) @ 86A
Output volts A (on-load) 2 x 500V 3ph (3 wire) @ 941A
Ingress Protection BS EN60529 IP00
Frequency – Hz. 50 / 60 Hz
Type Dry
Vector Group Dd0yn11
Screen between HV/LV windings Yes
Ambient Temperature Degrees C 30°c
Impedance Voltage (%) 7%
Primary Tapings ± 2.5 & 5%
Duty Cycle Continuous
Commulating Impedance (%) 7.3% (balanced to 10% between windings)
Total loss @ nominal voltage/ freq. TBA
Dielectric Class 28 kV
Insulation Class (Temp. rise) H
Winding Conductor Material TBA
Item Data Option A
Part B – Fittings
volts (on-load) 520VDC
Input 1150A DC (from 6 pulse)
Output 2300A DC (12 pulse)
Ingress Protection BS EN60529 IP00
Frequency – Hz. 300 Hz
Quantity 1
Rating 1630 kVA
Enclosed (Medium grey) IP22
Height (mm) Approx. H 2000
Length (mm) Approx. L 2000
Depth (mm) Approx. W 3000
Weight (kg) Approx. 5000
Item Data Option A
Part B – Fittings
Quantity 1
Inductance (L) 2.0 mH maintained for 10% of ADC
Rating 2300ADC
Enclosed (Medium grey) Open
Height (mm) Approx. A 700
Length (mm) Approx. B 600
Depth (mm) Approx. C 500
Weight (kg) Approx. 350
Connection Bushings / Cu bus bar flags.
Protection Not requested
Notes For use with regenerative 12 pulse thyristor drive to start and run a DC motor
Not oversized for input harmonics or any other factor not shown on the quote
Standard BSEN 60076
Connection Copper busbar flags (to be confirmed)
Protection Not requested
Overload Not oversized as values NOT advised
Standard BS 60076
Page 26
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Type An (dry)
Phases 6 / 12
Ambient Temperature Degrees C 30°c (peaks of 40°c)
Winding voltage at 300Hz 588V Pk to Pk Trapezodial Wave
Maximum DC imbalance current 230A DC
Tapings (MV) None Requested
Duty Cycle Continuous
Noise Emission dB(A) (Lpa) N/A
Dielectric Class 3kV
BIL/Separate Source Withstand N/A
Insulation Class (Temp. rise) H
Winding Conductor Material TBA