PROJECT CASE
Guangda Electric Is A Professional Organization Dedicated To Solving Power Quality Problems Of Users
How to manage harmonic current pollution from UPS in textile factories?
Harmonic Control Typical Case in the Textile Industry (Guangdong Minxing Wool Knitting Co., Ltd.) Project Background: A certain textile factory's main loads are high-capacity UPS and computer knitting machines. The UPS provides high-quality power with high voltage regulation accuracy and low waveform distortion. However, since the UPS is a nonlinear load, the rectifier in the UPS generates a large amount of harmonic current, resulting in a high current distortion rate on the grid side. This not only causes harmonic pollution to the power grid but also affects the normal operation of the reactive power compensation cabinet, necessitating harmonic control. Control Plan: Based on on-site test results, it was found that the reason the reactive power compensation cabinet could not be normally engaged was due to the harmonic current generated by the UPS.
2025-02-13
How are current harmonics managed in the variable frequency drives of water treatment plants?
Typical Case of Harmonic Control in Water Treatment Plant (Nanjing Pukou Water Treatment Plant)\nProject Background: A certain water treatment plant operates its intake pump motor using a high-power variable frequency drive. Due to the high-power diode rectification and high-power thyristor inversion within the variable frequency drive, high-order current harmonics are generated in the input and output circuits, which interfere with the power supply system, loads, and other nearby electrical equipment, affecting the normal operation of metering instruments.\nControl Plan: After on-site testing and analysis, it was determined that using one of our 100A active power filters could effectively suppress the harmonics, allowing the metering instruments to function normally.\nControl Effect: After the control measures were implemented, the harmonics were effectively suppressed.
2025-02-13
The main harmonic source under the 10kV main transformer of a certain pharmaceutical factory is the fermentation workshop. This workshop has 4 transformers (2000kVA, 10/0.4kV), with every two connected in parallel as a group, divided into two groups for independent operation. One group (on the east side) is connected to 6 variable frequency drives (VFDs) with motor capacities of 280KW each, while the other group (on the west side) is connected to 7 VFDs with motor capacities of 200KW each. The VFDs generate significant non-sinusoidal distorted currents during operation, causing serious interference to the power grid. To purify the power grid, improve the system power factor, and eliminate harmonics.
2025-02-13
Harmonic Control Solutions for Tobacco Leaf Processing Plants with Variable Frequency Drives
The tobacco leaf processing company has harmonic sources mainly from two distribution rooms. The load is the "leaf stripping line," which filters out impurities from the tobacco leaves to obtain impurity-free tobacco leaves. This process is achieved through inverters and motors. The inverter is a significant source of harmonics, which causes serious harmonic pollution and interference in the system, necessitating harmonic treatment. Treatment plan: Based on the analysis of the test data, we recommend using 7 active power filters in the two distribution rooms: two units in the first distribution room and the remaining units in the second distribution room.
2025-02-13
How should harmonics be managed in a cigarette factory with multiple variable frequency devices?
Harmonic Control Typical Case 2: (Xuzhou Cigarette Factory) Project Background: Currently, a large number of variable frequency drives (VFDs) are used in the production equipment of cigarette factories. VFDs are typical nonlinear power sources, which leads to a high harmonic content in the current of the power supply system. This significantly increases the harmonic losses in the power supply lines and poses a threat to the safe operation of other electrical equipment. The various departments of the cigarette factory have increasingly clear awareness of energy conservation and consumption reduction, as well as the need to control harmonic pollution. Therefore, harmonic control of the power supply system has become a key project for the cigarette factory. Control Plan: Based on the above situation, our company conducted data analysis from on-site testing and found that the main harmonics of the cigarette factory...
2025-02-13
How to solve harmonic currents in modern communication equipment rooms?
With the rapid development of the communication industry, the scale of communication power supply systems has also been growing, and power supply equipment has become overly concentrated due to continuous expansion. A certain mobile branch company has used multiple sets of UPS and switch power supply systems. UPS and switch power supplies are typical three-phase nonlinear loads. These nonlinear devices generate a large amount of harmonics during use, leading to distortion in voltage and current waveforms, which severely affects the power supply safety of the machine room. Governance plan: In order to eliminate power supply hazards and improve the safety and reliability of AC power supply in the comprehensive building, based on the on-site conditions.
2025-02-13
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