TTP/M – THREE-PHASE ISOLATION TRANSFORMERS FROM 1 kVA TO 200 kVA WITH THREE-PHASE INPUT AND SINGLE-PHASE OUTPUT
THREE-PHASE ISOLATION TRANSFORMERS FROM 1 kVA TO 200 kVA THREE-PHASE INPUT – SINGLE-PHASE OUTPUT K-factor three-phase isolation transformers are manufactured with the highest quality and construction techniques, available in various voltage combinations.
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Natural air cooling (AN type), suitable for indoor installation.
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Enameled electrolytic copper windings
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Low-loss magnetic steel core
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Resin-impregnated windings
ELECTRICAL CHARACTERISTICS
| Rated power: | from 1 kVA to 200 kVA |
| Primary side voltage: | from 110 V to 600 V THREE-PHASE |
| Secondary side voltage: | from 50 V to 600 V SINGLE-PHASE |
| Frequency: | 50/60 Hz |
| Standard connection group | OPEN DELTA/single-phase |
| Standard CEI vector group | Dap/mon |
| Insulation level (RMS value) | 4.2 kV |
| Inrush current: | < 15 In |
| Short-circuit voltage (Vcc%) | < 4% |
| Temperature class | F |
| Maximum temperature rise limits (ta=25°C) | 100°C |
| Reference ambient temperatures | -5°C ~ +40°C |
| Maximum sound pressure level at 1 m | < 60 dB(A) |
| Relative air humidity | 50% ~ 95% |
| Operating altitude without derating: | up to 1000 m a.s.l. |
| Degree of protection | IP00 |
| Protection class | I |
| Applied standards: | CEI EN 61558-2-1 |
for installations at higher altitudes, an adequate power reduction (“derating”) must be considered.
MECHANICAL CHARACTERISTICS
| Lifting eyebolts | Upon request |
| Rating plate | YES |
| Earth terminal | YES |
IMPORTANT NOTE ON THREE-PHASE TO SINGLE-PHASE TRANSFORMERS:
While the current flowing in the secondary windings is always the same and is the one supplied to the load, the primary current is not equal across the 3 phases: the central phase absorbs twice the current of the other two.
Therefore, the average primary current must be calculated as I1m=I2*(E2/E1)
(E1=primary phase voltage, E2=secondary phase voltage, I2=secondary current)
If, for example, we need a 220 V single-phase voltage with a 15 kVA load, and we intend to draw from a 400 V three-phase supply, the secondary current is I2=68.18 A
Thus, the average current on the primary is I1m=68.18*(110/231)=32.46 A
The current in the central phase will be I12=I1m3/2=31.651.5=48.69 A
The current in the lateral phases will be I11=I13=I12/2=24.34 A
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| A | B |
For these products, the SAM series metal boxes are available.
