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toll free 800.334.5214 ACME ELECTRIC |
hubbell-acmeelectric.comD r i v e I s o l a t i o n T r a n s f o r m e r s a n d A C L i n e R e a c t o r s
5
DRIVE ISOLATIONTRANSFORMERS
The Acme Drive Isolation Transformers are specifically designed to accommodate the special voltages and kVA sizes unique
to AC and DC motor drive applications.
Features
Q
UL Type 3R Enclosures with Weather Shield on Ventilated Units (above 20 kVA). Type 2 Enclosure without weather shield. UL
Listed and CSA certified. 7.5–20.0 kVA are encapsulated, UL 3R.
Q
3-Phase 60 Hertz.
Q
180°C and 220°C insulation systems.
Q
Encapsulated and ventilated designs. All ventilated units, are of strip wound construction. Acme’s reinforced core assemblies
enhance quiet operation.
Q
Nominally 6% impedance.
Q
Designed for use with AC, adjustable frequency or DC drives.
Q
Full capacity taps are featured on all units. On 7.5 through 20 kVA units, taps are 1-5% ANFC and 1-5% BNFC. On 27 through
880 kVA units, taps are 2-2
1
/
2
% ANFC and 2-2
1
/
2
% BNFC.
Q
Full range of kVA ratings cover all standard drive systems.
Q
Ample wiring compartment for easy cable entry.
Q
Optional wall mounting brackets for certain sizes.
Stress relief
Acme uses strip conductors (above 7.5 kVA) instead of wire for a DIT series that easily accommodates the severe electrical and
mechanical stresses found in today’s AC & DCmotor drives. The inherent excellent line isolation of these transformers is further
enhanced with the extra protection of Acme’s Electrostatic Shield — free in all DIT’s.
Lower losses
The harmonic currents generated by AC & DC drives increase eddy current losses (heat) in transformer windings. The thicker
the winding conductor, the greater the losses. Acme uses one turn per layer of thin strip conductor which provides lower eddy
current losses than comparable wire wound units. Lower losses = cooler operation and longer transformer life.
Reduced short circuit forces
Strip windings minimize axial short circuit forces that can cause mechanical displacement of
the windings under fault conditions. For extra protection all designs 7.5 kVA and above use
primary and secondary coils of equal axial length. This feature tends to negate axial short
circuit forces, further improving transformer life expectancy.
Selection instructions
If you know the motor horse-power, simply follow the drive system
manufacturer’s recommendation.
Or, select the corresponding kVA from the chart on the right.
For example, a 40 Hp motor requires a 51 kVA DIT.
H.P.
kVA
5.0
7.5
7.5
11.0
10.0
14.0
15.0
20.0
20.0
27.0
25.0
34.0
30.0
40.0
40.0
51.0
50.0
63.0
60.0
75.0
75.0
93.0
100.0
118.0
125.0
145.0
150.0
175.0
200.0
220.0
250.0
275.0
300.0
330.0
400.0
440.0
500.0
550.0
600.0
660.0