Issues with the use of filtering devices
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Our company produces chemical raw materials using electrolysis. After high-voltage municipal electricity of 10,000 volts enters the facility, it goes to the high-voltage chamber; after leaving that chamber, it is stepped down in voltage using a transformer. Following that, it enters a rectifier cabinet where AC is converted to DC, and finally the desired DC current and voltage are generated. It is designed as one transformer with two rectifier cabinets. May I ask, when installing harmonic filtering devices, should one set be installed alongside the transformer, or two sets alongside the rectifier cabinet?
Two sets are installed in conjunction with the rectifier cabinet, which provides better filtering effects.
No way, it should be sufficient to install a set of filters on the bus bar connected in parallel with the transformer. That’s what we do, and I’ve just completed a project of this kind.
If the harmonic current is not high, it should be installed on the high-voltage side of the rectifier transformer
From what the original poster says, it seems to be a rectifier cabinet installed on the low-voltage side.:lol I agree with the suggestion above – it’s best to have a professional manufacturer specializing in filtering and compensation carry out tests to determine the level of harmonics present, so as to decide on the most appropriate filtering method. If the harmonic levels are not high, compensation can be done on the transformer side; compensating at the equipment level increases costs, and the price of filtering and compensation devices is already high, especially active filtering devices. In the original poster’s case, passive filtering should suffice. Haha, the cost would be in the hundreds of thousands, depending on the size of the transformer and whether dynamic or static compensation is used
In terms of performance, compensation near the device is more effective, as it allows for the targeted elimination of the harmonics generated by the rectifier, especially in the case of passive filtering. Moreover, such compensation can effectively prevent harmonics from interfering with other devices on the common bus.
Based on what you’ve described, the previous set of harmonic filtering devices will suffice. But first, I suggest that your factory conduct actual tests on the harmonic levels in the power supply system, and then carry out harmonic mitigation based on the results of those tests.