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Power Capacitors
- BY71 Series Cylindrical Capacitor
- BSMJ Series Self-healing Low Voltage Shunt Capacitors
- BY86 Series Controlled Intelligent Capacitor
- BYKXG/F Series Anti-harmonic Intelligent Capacitor
- BY81 Series Intelligent Capacitor
- BY82J Series Anti-harmonic Intelligent Capacitor
- BY89 Series Intelligent Capacitor
- Intelligent Controller Series
- Reactor
- Intelligent Switch Series
- Alternating Current Contactor
- Multifunctional power instruments
- Circuit Breaker
- APF/SVG/SPC Cabinet & Module Series
BY91-APF/75A-0.4/4L-N Series High-Quality Three-Phase 4-Wire Active Filter
Technical Specification of BY91-APF/75A-0.4/4L-N（APF）
| Model | BY91-APF/75A-0.4/4L-N |
| Rated voltage | 400V |
| Rated current | 75A |
| Total harmonic compensation rate | >85% |
| Power input frequency | 50Hz |
| Input voltage unbalance degree | <5% |
| Impulse withstand voltage | / |
| loss | <5% |
| Response time | <40ms |
| Noise | <65dB |
| Installation and use place | Indoor |
| Enclosure protection level | IP20 |
| meet the standards | JB/T 11067-2011 |
Overview of BY91-APF/75A-0.4/4L-N（APF）
The BY91-APF/75A-0.4/4L-N series from BaoYu Holdings Ltd. is a cutting-edge Shunt Active Power Filter (APF) designed to address complex power quality challenges in 3-phase powersystems. Ideal for low voltage power applications, this Active Harmonic Filter dynamically eliminates harmonics, compensates for three-phase imbalance, and delivers dynamic reactive power compensation to optimize energy efficiency. Leveraging intelligent control algorithms, it ensures real-time monitoring of 3-phase voltage fluctuations, enabling adaptive correction of power quality harmonics and low voltage power disturbances.
Engineered for 3-phase electric networks, the Shunt Active Power Filter Working principle allows seamless integration into low power voltage systems, targeting harmonic distortion from nonlinear loads. Its active and passive filters for harmonics hybrid design ensures robust anti-harmonic filter performance, reducing THD to below 5%. The automatic harmonic filterfunctionality adapts to varying loads, while dynamic reactive power compensation controlstabilizes 3-phase power voltage and minimizes line losses. Compatible with low power electricity infrastructures, this power harmonic filter also features three-phase unbalanced adaptive correction, ensuring balanced currents and voltages across all phases. With anti-interference technology, it operates reliably in industrial and commercial environments plagued by electromagnetic noise.
The BY91-APF/75A-0.4/4L-N series excels as a current source active filter, delivering high-efficiency energy savings by mitigating power quality issues in low-voltage filter applications. Its electrical harmonic filter capability targets harmonics up to the 50th order, while power filtering algorithms suppress voltage sags, swells, and flickers. The active power filter supports low-voltage reactive power compensation, enhancing grid stability and reducing penalties associated with poor power factor.Equipped with real-time monitoring, the system provides granular insights into 3-phase electricparameters, enabling proactive maintenance. The intelligent control system autonomously adjusts compensation strategies for three-phase unbalanced adaptive correction, ensuring optimal performance under fluctuating loads. Unlike traditional solutions, this shunt active power filter combines active and passive filters for harmonics to achieve superior anti-harmonic filter results without sacrificing scalability. Its compact design suits space-constrained installations, while anti-interference shielding guarantees reliability in harsh environments.By integrating dynamic reactive power compensation control and three-phase imbalance compensation, the BY91-APF series elevates power quality in industrial plants, data centers, and renewable energy systems. As a power quality filter, it not only extends equipment lifespan but also aligns with global standards for efficient energy management. Trust BaoYu’s expertise in low-voltage power solutions to safeguard your infrastructure against harmonics, imbalance, and reactive power inefficiencies—ensuring a cleaner, greener grid.
Overview of BY91-APF/75A-0.4/4L-N（APF）main features
- Advanced shunt active power filter operation technology eliminates power quality harmonics and ensures stable three-phase supply voltage in low-voltage power systems
- Integrate dynamic reactive power compensation and three-phase unbalance compensation to optimize the power quality of the three-phase grid.
- Intelligent control system enables adaptive correction of three-phase imbalance and automatic harmonic filter adjustment for seamless power filtering.
- Real-time monitoring of three-phase voltage and current to ensure the accuracy and anti-interference performance of low-voltage reactive power compensation.
- Combination of active and passive harmonic filters provides excellent anti-harmonic filtering efficiency, reducing THD to less than 5%.
- Current source active filter design supports low power power systems with high efficiency energy saving and dynamic reactive power compensation control.
- Powerful electrical harmonic filtering handles up to the 50th harmonic, protecting the three-phase power infrastructure from power quality degradation.
- Compact low-voltage filter solutions with anti-interference shielding ensure reliable operation in harsh environments with fluctuating mains low voltages.
Working Principle of BY91-APF/75A-0.4/4L-N（APF）
1. Harmonic detection and dynamic compensation core
The BY91-APF/75A-0.4/4L-N active power filter (APF) uses the working principle of a parallel active power filter to detect harmonics and imbalances in a three-phase power system. It uses a high-speed DSP processor to analyze the three-phase voltage and current waveforms in real time to identify power quality harmonics, such as 2nd to 50th harmonic distortion. The dynamic reactive power compensation module instantly generates reverse harmonic currents to eliminate harmonic distortion while stabilizing the low-voltage grid. This anti-harmonic filtering mechanism ensures that THD is reduced to less than 5%, meeting global power quality standards.
2. Intelligent control and three-phase balance
At its core is the three-phase unbalanced adaptive correction function driven by an intelligent control system. By continuously monitoring the three-phase electrical parameters, the APF can autonomously adjust the compensation current to correct the three-phase unbalanced compensation and ensure balanced load on each phase. The automatic harmonic filtering function dynamically responds to fluctuating low-power power demand and optimizes dynamic reactive power compensation control. This hybrid integrated design of active and passive harmonic filters ensures accurate power filtering even in environments with high electromagnetic interference requirements.
3. High-efficiency inverter and energy optimization
The current source active filter design utilizes an IGBT-based inverter to inject compensation current into the three-phase voltage system. The low-voltage filter module operates with an efficiency of more than 95%, minimizing energy losses during power harmonic filtering operation. Dynamic reactive power compensation enhances its power harmonic filtering capabilities, thereby reducing line losses and improving low-voltage reactive power compensation performance. The system's energy-efficient design also supports low-voltage power stability, making it an ideal choice for industrial facilities focused on sustainability.
4. Real-time monitoring and anti-interference shielding
The APF is equipped with a real-time monitoring interface that provides deep insights into power quality indicators, including harmonic spectrum, voltage sag, and three-phase voltage imbalance. The power quality filter integrates advanced anti-interference shielding to resist electromagnetic noise in harsh environments. Its active harmonic filtering algorithm can adapt to low voltage fluctuations, while the parallel active power filter structure ensures seamless integration with existing three-phase power infrastructure. This rugged design ensures reliable power filtering and long-term power quality harmonic protection even in unstable grid conditions.
Wiring Method of BY91-APF/75A-0.4/4L-N（APF）
The LOAD end is connected to the load. That is, N is connected to the neutral wire, and L is connected to the live wire. The three E's on the right are grounded, with N connected to the neutral wire and L connected to the live wire. This is the power input end.The wiring method is as follows: Input L is connected to 1, N is connected to 2; Output L' is connected to 3, N' is connected to 4; the ground wire is grounded.
APF Dimension Diagram
| Model | L | W | H |
| BY91-APF/75A-0.4/4L-N | 450mm | 580mm | 110mm |
Applications of BY91-APF/75A-0.4/4L-N（APF）
Commercial and high-density urban infrastructure
The BY91-APF/75A-0.4/4L-N active power filter (APF) is ideal for stabilizing three-phase power in commercial complexes, data centers, and urban transportation systems that are plagued by power quality harmonics generated by non-linear loads such as LED lighting and HVAC systems. Its parallel active power filter operating principle ensures dynamic reactive power compensation, corrects voltage fluctuations, and compensates for three-phase imbalance caused by uneven load distribution. Through real-time monitoring and intelligent control, the system can adapt to low-voltage power needs, reduce THD to less than 5%, and improve power quality. The anti-harmonic filter design also features anti-interference shielding to resist electromagnetic noise in dense urban environments, thereby ensuring reliable three-phase grid performance and achieving efficient energy saving for critical infrastructure.
Renewable energy systems (solar/wind farms)
In solar and wind farms, the BY91-APF/75A-0.4/4L-N can be used as a power quality filter to mitigate harmonics and voltage instability caused by inverters and variable speed turbines. The current source active filter dynamically compensates low voltage reactive power to stabilize the three-phase supply voltage during intermittent generation. Its automatic harmonic filtering function adapts to rapid load changes, while the three-phase unbalance adaptive correction function balances the current in three-phase grids connected to unevenly distributed renewable energy sources. The hybrid design of active and passive filters for harmonics ensures robust power filtering, reduces grid compliance risks, and optimizes low-power power integration. Dynamic reactive power compensation control further minimizes energy losses and supports sustainable low-voltage power systems.
Industrial Manufacturing Facilities
For industrial plants with heavy machinery, BY91-APF/75A-0.4/4L-N solves power quality issues such as three-phase imbalance caused by inverter harmonics and asymmetrical loads. The shunt active power filter provides dynamic reactive power compensation, stabilizes the three-phase voltage and reduces the risk of motor overheating. Its electrical harmonic filter neutralizes harmonics up to the 50th order, while the intelligent control function enables adaptive correction of three-phase imbalance for balanced three-phase power distribution. The low-voltage filter module operates efficiently in low-voltage environments and uses anti-interference technology to withstand harsh electromagnetic environments. By integrating real-time monitoring and efficient energy-saving algorithms, APF reduces operating costs and extends equipment life in demanding manufacturing environments.
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Baoyu Holding Co., Ltd
Baoyu Holding Co., Ltd. was founded in 2015 and is located in Wenzhou City, Zhejiang Province. The location is excellent and the transportation is convenient. We have very rich industry experience and is a trusted supplier. The company has advanced production equipment and skilled front-line employees. Our company is mainly engaged in the production and sales of power quality products，such as active power filters, static var generators, intelligent capacitors, power capacitors, reactive power compensators, composite switches, capacitor contactors, thyristor switches, reactors. Our company knows that the development of the company depends on the innovation and quality of the products. Therefore, our products have strict quality control from the procurement of raw materials to the sale of finished products. The company has established a quality management system that meets the requirements of the international quality management system. The company continuously releases the original innovations according to the market and customer needs, and always maintains the novelty and innovation of the products. The company wants the customer's thoughts and urgency. Solving problems for customers and meeting customer needs is our eternal pursuit! Our company's products are sold worldwide. The company has won the unanimous recognition of consumers with satisfactory product quality and perfect after-sales service. We have a professional R & D team. We can accept O E M and O D M.We sincerely welcome friends from all over the world to visit our company and cooperate with us on the basis of long-term mutual benefits. We are looking forward to receiving your enquiry soon.
Our storage facility utilizes precision climate control, automated 3D warehousing (which increases capacity by 200%), and integrated safety systems (including fire suppression, anti-static protocols, and monthly audits) to maintain zero oxidation and ensure product integrity. In addition, our cleanroom manufacturing facility features a combination of natural and LED lighting, optimized workflows, and cross-trained technicians to enhance efficiency. Automated quality control systems and ISO-certified processes ensure compliance with dimensional and electrical standards, while AI-driven analytics and stringent protocols help achieve near-zero defects. By integrating advanced automation, tailored solutions, and steadfast reliability, Baoyu provides durable, mission-critical power systems, reinforcing our status as the preferred global partner for industries that require precision and innovation.
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