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12 pulse rectifier transformer
Classification:
Industry News
Release time:
2025-03-05
The 12-pulse rectifier transformer is a type of rectifier transformer. The rectifier transformer is a power transformer for rectifying equipment. Its task is to convert AC into a voltage of a certain size and phase number, and then rectify it through the rectifier element to meet the requirements of DC output. Next, we will talk about the definition, characteristics, and its main application scenarios of the 12-pulse rectifier transformer.
Basic composition of 12-pulse rectifier transformer
Iron core (high magnetic silicon steel sheet), primary winding, secondary winding (star Y connection and triangular Δ connection), phase shifting function, insulation system (oil immersion, dry or epoxy resin casting), cooling system (oil-cooled, air-cooled), shell and accessories
Advantages of 12-pulse rectifier transformer
It adopts a star Y and triangular Δ double-layer winding design, which can generate 5th and 7th harmonics during equipment operation, thereby improving the stability of the power grid.
Compared with 6-pulse rectifier transformers, the equipment has a higher power factor, thereby reducing reactive power loss.
Because the filter design problems are simplified, the power quality is improved.
Reference parameters of 12-pulse rectifier transformer
| Parameter | Values (example) |
| Rated capacity | 500kVA – 5000kVA |
| Input Voltage | 6kV / 10kV / 35kV（Customizable） |
| Output Voltage | 400V / 660V / 1000V（Customizable） |
| Phase Number | thress phase |
| Frequency | 50Hz / 60Hz |
| Insulation level | F级 / H级 |
| Connection Method | Y/Δ，Move phase30° |
| How to run | Long-term continuous operation |
| Cooling method | Oil-soaked self-cooling (ONAN), air-cooling (AF), water-cooling (WF) |
| Efficiency | ≥98% |
| Insulation pressure resistant | Power frequency voltage withstand 35kV |
| Ambient temperature | -40°C ~ 50°C |
| Applicable industries | Metallurgy, electrolysis, electroplating, motor drive, high voltage direct current transmission (HVDC), rail transit, etc. |
Harmonic
You can think of the current and voltage in the grid as a straight and smooth river that should flow at a fixed rhythm (50Hz or 60Hz). If the water surface is calm and the water flows evenly, it means that the power grid is healthy.
However, when some special equipment (such as frequency converters, rectifiers, arc furnaces, switching power supplies, etc.) are connected to the power grid, they will disrupt the water flow like throwing stones in water or starting a boat, forming waves and vortexes. These waves are harmonic, and their rhythm (frequency) is the integer multiple of the original grid rhythm, such as 100Hz, 150Hz, 200Hz... These "extra waves" that should not appear are harmonic interference.
Harmonics will cause unstable equipment to run, heat generation, and unstable current, which will make the equipment easy to heat up, which may burn in severe cases, which will also affect the stable operation of other equipment and the increase in electricity bills.
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