June 2, 2014

Gapped Inductor Load Bank

The customer application is shown below:


Twelve gapped inductor load banks  are shown in Table A. These load banks can be programmed by the customer for connections in parallel to offer a programmable load from 50 KVA to 600 KVA. 
Table A



The schematic of the gapped inductor load bank is shown below:




Specifications:

  • Gapped Inductor Load Bank, 3 PH, 50 Hz, 50 KVA
  • L (1, N) = 7.35 mH ± 25%, 100 Amps
  • L (2, N) = 7.35 mH ± 25%, 100 Amps
  • L (3, N) = 7.35 mH ± 25%, 100 Amps
  • Copper winding construction
  • Copper bus bars are 1" x ¼” with one hole
  • Open core & coil: 17"H x 20"W x 14"D approximately
  • Calculated temperature rise: 42°C
  • 12 Inductors will be housed inside an indoor enclosure, 50"H x 65"W x 36"D

The estimated dimensions of the inductor load bank is shown below:




Twelve inductor load bank is housed inside an indoor enclosure (50"H x 46"W x 36"D) as shown below:




The photo of the enclosure is shown below:



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May 15, 2014

3 PH to 1 PH Transformer, 12 KVA, P/N 6411LA, Rev A



3 PHASE TO 1 PHASE TRANSFORMER

(TEST AND ANALYSIS)

A 3 PH to 1 PH transformer was constructed as shown in the photograph below:
The schematic of the transformer and the test set up are shown in Figure 1. An open delta is connected to an open wye with middle coil missing. Thee phase power is applied at (2, 5, and 1/6).

The following tests were performed by L/C Magnetics:

Test 1:
  • No load test. 
  • Input voltages are 210 VAC, 3 PH, 60 Hz 
  • Output voltage measured is 210 VAC, 1 PH, 60 Hz 
  • Excitation current IA = 0.5 A 
  • Excitation current IB = 0.5 A 
  • Excitation current IC = 0.5 A 
  • V1,2 = 210 VAC approx 
  • V5,6 = 210 VAC approx 
  • V2,5 = 213 VAC approx 
  • V7,8 = 211 VAC approx 
  • V3,4 = 211 VAC approx 
  • V4,8 = 365 VAC approx 
  • SUMMARY: 
  • INPUT IS 210 VAC, 3 PH. 
  • OUTPUT IS 210 x √3 = 363 VAC.


Test 2:
  • 12.5 ohm load test 
  • Input voltages are 212, 220, 228 VAC, 3 PH, 60 Hz approx. 
  • Output voltage measured is 360 VAC, 1 PH, 60 Hz 
  • V 4,8 = 360 VAC approx 
  • V 4,3 = 206 VAC approx 
  • V 7,8 = 220 VAC approx 
  • Line current IA = 29.4 A approx 
  • Line current IB = 57 A approx 
  • Line current IC = 28.5 A approx 
  • ID = 28.5 A 
  • SUMMARY: 
  • INPUT IS 210 VAC, 3 PH, 60 Hz. 
  • OUTPUT is 360 VAC. IB IS TWICE AS MUCH AS IA OR IC 


Test 3 set up is shown in Figure 2 below:


Test 3:
  • No load test. 
  • See Figure 2, V 4,8 = 210 VAC, 1 PH, 60 Hz 
  • V 3,4 = 105 VAC approx 
  • V 7,8 = 105 VAC approx 
  • V 1,5 = 105 VAC approx 
  • V 1,2 = 105 VAC approx 
  • V 2,5 = 1.1 VAC approx 
  • SUMMARY: 
  • INPUT POWER IS 210 VAC, 1 PH, 60 Hz. 
  • OUTPUT POWER IS NOT 210 VAC, 3 PH, 60 Hz. 
  • THE TRANSFORMER DOES NOT WORK AS 1 PH TO 3 PH TRANSFORMER. 

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December 23, 2013

2500 Amp Transformer, 120 KVA, Output 48 VAC 2500 Amps, P/N 19009NU

Product Overview

 The details of the single phase 2500 amp transformer, part number 19009NU is shown below. Primary is 480 VAC, 250 Amps. Secondary is 48 VAC, 2500 Amps. The unit is housed inside an indoor enclosure. 


2500 Amp High Current Transformer

Specifications:

  • High Current Transformer 120 KVA, 1 PH, 60 Hz, P/N 19009NU 
  • Primary: 480 VAC, 250 Amps 
  • Primary turns are 71 turns and placed over the secondary turns 
  • Primary copper bus bars are 1/4” x 1” with one hole 
  • Secondary: 48 VAC ± 5 %, 2500 Amps 
  • Secondary turns are 7.5 turns and wound first 
  • Secondary copper bus bars are 3/8” x 4” with four holes 
  • Turn ratio: 1 to 9.845 
  • Copper winding construction 
  • Indoor enclosure: 50”H x 36”W x 26”D

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4000 Amp Transformer, 32 KVA, Output 8 VAC 4000 Amps, P/N 19005U

Product Overview
The details of the 4000 amp single turn transformer, part number 19005 is shown below. Primary is 220/230/240/250 VAC, 1 PH, 60 Hz. Secondary is 8 VAC, 8000 Amps.




4000 Amp High Current Transformer

Specifications:

  • High Current Transformer 32 KVA, 1 PH, 60 Hz, P/N 19005U
  • Primary: 220/230/240/250 VAC, 145 Amps max
  • Secondary: 8 VAC, 4000 Amps, 1 turn of customer supplied bus bar
  • Window provided for customer bus bar: 5" x 5"
  • Primary copper bus bar: 1/4" x 1" with one hole
  • Estimated dimensions: 16"H x 23"W x 17"D
  • If 250 VAC is applied on input 1 and 2, output 6 and 7 is 9.2 VAC approximately. 
  • Estimated weight: 600 lbs approx.

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200 Amp High Current Transformer, 0.5 KVA, Output 2.5 VAC 200 Amps,

Product Overview:

The details of the single phase 200 amp transformer, 0.5 KVA part number 18812U is shown below. Input is 1.25 / 12.5 VAC, 1 PH, 60 Hz. Output 2.5 VAC at 200 Amps, 1 PH, 60 Hz.

High Current Transformer 0.5 KVA

Specifications:

  • Transformer 0.5 KVA, 1 PH, 60 Hz, P/N 18812U
  • Primary: 1.25 / 12.5 VAC, 40 Amps
  • Secondary: 2.5 VAC, 200 Amps
  • Open Core & Coil
  • Dimensions: 6” H x 5.25” W x 8” D, approximately
  • Input bus bars are ⅛” x ⅝” with 1 hole.
  • Output bus bars are 1” x ¼” with 1 hole
  • Turn ratio 5:1 and 1:2


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High Current 3000 Amp Transformer, 24 KVA, Output 8 VAC 3000 Amps, P/N 18420

Product Overview:

The details of the single phase 300 amp transformer, 24 KVA part number 18420U is shown below. Input is 240 VAC, 1 PH, 60 Hz. Output 8 VAC at 3000 Amps, 1 PH, 60 Hz.


High Current 800 Amp Transformer

Specifications:


  • Transformer: 24 KVA, 1 PH, 60 Hz, P/N 18420U 
  • Primary: 480 VAC, 50 Amps 
  • Secondary: 8 VAC, 3000 Amps 
  • Open Core & Coil 
  • Dimensions: 12.5” H x 15” W x 25”D 
  • Weight: 300 lbs approx. 
  • Output bus bars are 4” x 5” x ¾” with one 9/16” dia. Hole 
  • Force cooling may be required

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500 Amp Transformer, 4 KVA, Output 8 VAC 500 Amps, P/N 18866U

Product Overview:

The details of the single phase 500 amp transformer, 4 KVA part number 18866U is shown below. Input is 480 VAC, 1 PH, 60 Hz. Output 8 VAC at 500 Amps, 1 PH, 60 Hz.



High Current 500 Amp Transformer

Specifications:

  • 4 KVA High Current Transformer: 1 PH, 60 Hz, P/N 18866U
  • Primary: 480 VAC, 8.33 Amps 
  • Secondary: 8 VAC, 500 Amps 
  • Open Core & Coil, dimensions: 10”H x 12” W x 8”D approximately 
  • Primary copper bus bars are 1/8” x 5/8” with one hole. 
  • Secondary Copper bus bars are 1 1/2” x 1/4” with one hole. 
  • Weight: 115 lbs approximately
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All our three phase high current transformers are custom built to order. To discuss your specific application, please call us toll free at (800) 595-7096, or send us an email at info@lcmagnetics.com.
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