1. Project Overview
This supermarket was built many years ago, e problemas harmônicos não foram considerados na configuração do sistema de energia então. When designing the power distribution system, O diâmetro do cabo da fase N era menor que o do cabo trifásico A/B/C.
The building is divided into three floors. The first floor is a supermarket, and the second and third floors are clothing stores. In the first floor’s power distribution circuit, serious N-phase heating, and excessive current problems occurred.
2. Distribution system diagram and main harmonic loads
There are 4 load outlet cabinets in the power distribution room, among which the power consumption of the supermarket on the first floor is led out from the 3# e 4# feeder cabinets.
In the power distribution structure, the power upstream of the 3# e 4# feeder cabinets is a dual power switch, and this switch is a 4P switch.
The typical harmonic source at this site is an LED indicator light
The first symptom of the problem discovered at the site was the heating problem of the N-phase shell of the dual power switch.
3. Harmonic data testing and analysis
After selecting the on-site transformer, we conducted a test at the incoming cabinet location to gain an overall understanding of the on-site power quality issues.
4. Harmonic solution
On-site improvement needs include resolving the overheating of the N-phase cables and switches in the first-floor supermarket. As the main harmonic source equipment is located in the first-floor supermarket, targeted measures are chosen to address the harmonic issues in the 3# e 4# feeder cabinets to reduce the N-phase current at the dual power switch positions and resolve the overheating issue in this N-phase location.
Equipment Selection: Filtro de potência ativa (APF)
Equipment model: CoEpo APF/200-0.4-D
Management method: local treatment
Installation capacity: 200UM
Installation method: rack type
Installation location: power distribution room
5. Effect
After harmonic improvement by active power filter:
1. The system’s current waveform has been significantly improved, from the original distorted waveform to a normal sine wave waveform;
2. The N-phase current dropped from the 251.4A to 17.2A. The N-phase current dropped significantly, so the N-phase cable heating problem is solved;
3. The system’s total harmonic distortion rate dropped from 47.2% para 4.6%, and the harmonic control effect was significant.
Tags: Power system configuration, Harmonic solution, Filtro de potência ativa (APF), CoEpo APF/200-0.4-D, 200A APF, rack type Active Power Filter, Fornecedores, Fabricantes, fábrica, atacado, comprar, preço, cotação, granel, comprável, Empresas, estoque, custar.
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