18-pulse autotransformer: Reduce harmonic distortions for long-lasting VFDs
SNC’s 18-pulse autotransformer is a heavy-duty, multi-phase transformer designed to effectively reduce harmonic distortion for variable frequency drive applications.
A variable frequency drive (VFD) is a type of motor controller that varies a motor’s frequency and supplied voltage in order to produce energy savings and greater efficiency.
Harmonic distortion can be detrimental Operation of the VFD and induce conductor and motor degradation. To ensure safe and reliable VFD operation, an 18-pulse autotransformer converts the disrupted raw power from a diesel engine into a wavelength that’s as pure as possible. A smooth wavelength, free of interruptions, results in a clean, reliable motor drive.
VFDs, and therefore 18-pulse autotransformers, are commonly purposed in applications with large drive motors requiring variable speed with variable torque, such as pumps, machine tools, blowers, conveyer systems, A/C motors and more. Industries range from mining to steel mills to marine and more.
What is an 18-pulse autotransformer?
Regardless of the industry or application, an 18-pulse autotransformer is a three-phase transformer that acts as a voltage regulator and is designed to continuously generate electrical pulses of constant amplitude and great velocity.
SNC’s 18-pulse autotransformer is a light, compact unit that offers a smaller footprint. Available with or without an enclosure, our rugged 18-pulse autotransformer also provides multiple aluminum busbar termination options in various sizes to meet your specific application requirements.
18-pulse autotransformer specs
- 3-phase, 480V primary and 427V secondary
- 60 Hz
- 50 to 500 horsepower ratings
- ETL UL 1561 certified
- Aluminum windings (While SNC uses aluminum windings and busbars to save on manufacturing costs, a lighter-weight transformer with copper windings and busbars are available upon request.)
- 180°C (356°F) for better insulation
- Thermal switches, which are normally closed as an added safety measure
To request a quote or get more information on how SNC can meet your exact specifications with 18-pulse autotransformers, contact our team today.
Product Options
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18-Pulse Autotransformer | 50 HP Rating | P23804
HP Rating
50
kVA
50
TH Height
17"
Mounting Depth
5.75"
Mounting Width
14"
Mounting Height
.562" Hole
Terminal Type LR,T
a
Width
19.125"
Height
25.35"
Depth
11.417"
Shipping Weight
375 lbs.
Watts Loss
1369
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1"
Aluminum Bus Bar Diameter
0.281"
Part Number
P23804
18-Pulse Autotransformer | 60 HP Rating | P23805
HP Rating
60
kVA
60
TH Height
16.5"
Mounting Depth
6.5"
Mounting Width
14"
Mounting Height
.562" Hole
Terminal Type LR,T
a
Width
19.375"
Height
24.9"
Depth
11.716"
Shipping Weight
375 lbs.
Watts Loss
1616
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1"
Aluminum Bus Bar Diameter
0.281"
Part Number
P23805
18-Pulse Autotransformer | 75 HP Rating | P23806
HP Rating
75
kVA
75
TH Height
16.5"
Mounting Depth
6.875"
Mounting Width
16.125"
Mounting Height
.562" Hole
Terminal Type LR,T
a
Width
19.125"
Height
27.75"
Depth
12.002"
Shipping Weight
415 lbs.
Watts Loss
1788
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1"
Aluminum Bus Bar Diameter
0.281"
Part Number
P23806
18-Pulse Autotransformer | 100 HP Rating | P23807
HP Rating
100
kVA
99
TH Height
19.5"
Mounting Depth
6.5"
Mounting Width
18"
Mounting Height
.562" Hole x 1.0" Slot
Terminal Type LR,T
a
Width
22.875"
Height
30.75"
Depth
12.777"
Shipping Weight
530 lbs.
Watts Loss
2218
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1"
Aluminum Bus Bar Diameter
0.281"
Part Number
P23807
18-Pulse Autotransformer | 125 HP Rating | P23809
HP Rating
125
kVA
124
TH Height
21"
Mounting Depth
7.5"
Mounting Width
16"
Mounting Height
.562" Hole
Terminal Type LR,T
a
Width
21.625"
Height
31.75"
Depth
12.091"
Shipping Weight
550 lbs.
Watts Loss
3021
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1"
Aluminum Bus Bar Diameter
0.281"
Part Number
P23809
18-Pulse Autotransformer | 150 HP Rating | P23811
HP Rating
150
kVA
149
TH Height
20.75"
Mounting Depth
7.625"
Mounting Width
19.625"
Mounting Height
.562" Hole
Terminal Type LR,T
b
Width
22.437"
Height
31.376"
Depth
14.402"
Shipping Weight
650 lbs.
Watts Loss
3535
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1"
Aluminum Bus Bar Diameter
0.438"
Part Number
P23811
18-Pulse Autotransformer | 200 HP Rating | P23819
HP Rating
200
kVA
199
TH Height
22"
Mounting Depth
8"
Mounting Width
24"
Mounting Height
.562" Hole
Terminal Type LR,T
b
Width
28.589"
Height
33.25"
Depth
14.539"
Shipping Weight
760 lbs.
Watts Loss
4375
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1"
Aluminum Bus Bar Diameter
0.438"
Part Number
P23819
18-Pulse Autotransformer | 250 HP Rating | P23958
HP Rating
250
kVA
249
TH Height
23.25"
Mounting Depth
8.5"
Mounting Width
24"
Mounting Height
.656" x 1.0" Slot
Terminal Type LR,T
c, b
Width
28.057"
Height
34.563"
Depth
14.34"
Shipping Weight
900 lbs.
Watts Loss
4434
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1.5 (1")
Aluminum Bus Bar Diameter
0.438"
Part Number
P23958
18-Pulse Autotransformer | 300 HP Rating | P23821
HP Rating
300
kVA
298
TH Height
26.25"
Mounting Depth
9"
Mounting Width
24"
Mounting Height
.656" x 1.0" Slot
Terminal Type LR,T
c
Width
26.383"
Height
38.563"
Depth
15.575"
Shipping Weight
1075 lbs.
Watts Loss
4898
Air Flow Required (LFM)
300
Aluminum Bus Bar Thickness
0.25"
Aluminum Bus Bar Width
1.5"
Aluminum Bus Bar Diameter
0.438"
Part Number
P23821
18-Pulse Autotransformer | 350 HP Rating | P23822
HP Rating
350
kVA
348
TH Height
26.25"
Mounting Depth
10"
Mounting Width
24"
Mounting Height
.656" x 1.0" Slot
Terminal Type LR,T
e, c
Width
27.077"
Height
38.563"
Depth
17"
Shipping Weight
1200 lbs.
Watts Loss
6129
Air Flow Required (LFM)
500
Aluminum Bus Bar Thickness
.375" (.25")
Aluminum Bus Bar Width
1.5"
Aluminum Bus Bar Diameter
0.438"
Part Number
P23822
18-Pulse Autotransformer | 400 HP Rating | P23823
HP Rating
400
kVA
398
TH Height
26.5"
Mounting Depth
10"
Mounting Width
25"
Mounting Height
.656" x 1.0" Slot
Terminal Type LR,T
e, c
Width
29.203"
Height
40.375"
Depth
17.468"
Shipping Weight
1400 lbs.
Watts Loss
6643
Air Flow Required (LFM)
500
Aluminum Bus Bar Thickness
.375" (.25")
Aluminum Bus Bar Width
1.5"
Aluminum Bus Bar Diameter
0.438"
Part Number
P23823
18-Pulse Autotransformer | 450 HP Rating | P23824
HP Rating
450
kVA
448
TH Height
27.75"
Mounting Depth
10"
Mounting Width
24"
Mounting Height
.656" Hole
Terminal Type LR,T
e, d
Width
28.637"
Height
41.125"
Depth
18.823"
Shipping Weight
1450 lbs.
Watts Loss
7046
Air Flow Required (LFM)
500
Aluminum Bus Bar Thickness
.375" (.25")
Aluminum Bus Bar Width
1.5 (2")
Aluminum Bus Bar Diameter
0.438"
Part Number
P23824
18-Pulse Autotransformer | 500 HP Rating | P23825
HP Rating
500
kVA
497
TH Height
28.25"
Mounting Depth
10"
Mounting Width
28"
Mounting Height
.812" x 1.0" Slot
Terminal Type LR,T
f, e
Width
30.611"
Height
41.75"
Depth
21.154"
Shipping Weight
2000 lbs.
Watts Loss
7772
Air Flow Required (LFM)
500
Aluminum Bus Bar Thickness
0.375"
Aluminum Bus Bar Width
2 (1.5")
Aluminum Bus Bar Diameter
0.438"
Part Number
P23825
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