JUMBO STEP DOWN

Power Partners’ JUMBO distribution transformers are designed as single-phase, two-winding transformers, specifically for step-down applications. ISO 9001: 2008 Certified

Jumbo Step Down transformer

Standard Features

  • Progressively wound coils with adhesive resins on thermally upgraded insulating paper provide increased short-circuit and thermal strength.
  • Sheet conductor in LV windings enables the electrical centers in the high and low to align themselves, minimizing the vertical component of short-circuit forces.
  • Reinforced core-coil assembly provides greater short-circuit withstand capability.
  • Prototype testing ensures the JUMBO design can meet industry short-circuit standards and provide reliable service.
  • Self-venting and resealing cover eliminates the need for an auxiliary pressure-relief device and offers increased safety through higher tank withstand.
  • ANSI support lugs (hanger brackets) are rod-welded to the tank wall for added strength.
  • Anodized, aluminum-laser inscribed nameplate offers longer-term readability.
  • Lifting lugs are positioned directly opposite the cover beam support lugs, reducing the chance of the tank going out of round when lifted.
  • Cover-mounted, high-voltage, porcelain bushings with eyebolt terminals are mounted on flat embossments on the cover and have undercut gasket seats for improved sealing. The eyebolt connectors are cast bronze-plated with tin.
  • Low-voltage porcelain bushings with clamp-type terminals provide ease in making secondary terminations.
  • Arrester mounting pads are resistance-welded to the tank wall, completely and uniformly filling the surfaces where pad and tank wall join to provide greater strength.
  • Durable, corrosion-resistant paint finish.

Specifications

  • 50 – 500 kVA
  • 65C rise
  • 60 Hz standard, 50 Hz optional
  • High voltages: 7200, 14,400 and 19,920
  • Low voltages: 2400, 4800, 7200, 7620, and 7970

Standard Design Dimensions and Weights
All dimensions and weights are approximate.
All approximate dimensions shown reference designs with 2.5% taps.

kVA A
Inches
(mm)
B
Inches
(mm)
C
Inches
(mm)
D
Inches
(mm)
Weight
Lbs.
(kg)
Shipping Weights
Lbs.
(kg)
Oil
Gallons
(L)
7,200 HV 14,400 HV 2,400 LV 7,200 LV
50 45
(1143)
47
(1194)
24
(610)
28
(711)
25
(635)
20
(508)
750
(341)
785
(357)
36
(137)
75 Not Available
100 45
(1143)
52
(1321)
31
(787)
31
(787)
31
(787)
22
(559)
1095
(497)
1150
(523)
50
(190)
167 58
(1473)
52
(1321)
33
(838)
37
(940)
33
(838)
27
(686)
2010
(914)
2090
(950)
88
(334)
250 54
(1372)
56
(1422)
41
(1041)
37
(940)
33
(838)
27
(686)
2340
(1064)
2440
(1109)
85
(323)
333 54
(1372)
64
(1625)
45
(1143)
37
(940)
33
(838)
27
(686)
2400
(1091)
2500
(1136)
88
(334)
500 69
(1753)
68
(1727)
45
(1143)
39
(991)
36
(914)
27
(686)
3065
(1393)
3165
(1439)
120
(456)

For more information, contact Power Partners at 706/548-3121.