BuyLog Flippingbook FEB 2025

TRANSFORMERS - LOW VOLTAGE, DRY TYPE, BUYLOG SECTION 5

5-44

— Drive isolation Product overview

The use of thyristor control circuitry with adjustable-speed drives has resulted in a need for a line of isolation transformers specifically designed to meet the demanding power supply requirements of thyristor controlled drives. Symmetrically placed taps and added coil bracing minimize mechanical forces caused by the often severe thyristor drive duty cycles. These reinforcing features also help protect the transformer from the regenerative duty cycles and more frequent temporary short-circuits associated with thyristor drives. Isolation transformers also reduce line pollution feedback resulting from thyristor firing circuits. The ABB delta-wye designs meet the NEC requirements for grounded secondary neutrals that isolate primary distribution systems. kVA ratings of the DIT line cover most dc motor requirements from 3 to 1000 hp.

The enclosed drive isolation transformers are UL listed and are excluded from the DOE 2016 regulations. Features • Unique core and coil design using grain oriented, annealed (non-aging) silicon steel • Core and coil assemblies mounted on neoprene isolation pads • Lifting eyes provided in top core clamp • Flexible copper ground strap (Type QL) • Lug kit included on most units up through 150kVA • Copper ground bar kit included in most units up through 150kVA

— Drive isolation

150°C Rise 60Hz copper three-phase

Ordering code

Approx. net weight (lbs)

Frame Size

Output voltage

kVA Frequency (Hz)

Input voltage

208 230 460

480

20 63

60 60 60 60 60

334 620

XV372 XV374 XV377 XV377 XV375

9T83B4001G09 9T83B4006G39 9T83B4012G51 9T83B4010G70 9T83B4008G70

208Y/120 380Y/219

220 145

1590 1590

270Y

270Y/156

93

765