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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
BY71 0.48-25-3Series Cylindrical Capacitor Cylindrical Capacitor With Dielectric 480V
Model Meaning
Product Datas of BY71 0.48-30-3 Cylindrical Capacitor
| Model | BY71 0.48-20-3 | |
| Rated Working Voltage | 480V | |
| Capacitor Capacity | 414.7μF | |
| Rated Working Current | 36.1A | |
| Loss angle Tangent Value | ≤0.0012 at rated power frequency voltagev | |
| Capacitance Deviation | The discrepancy between the measured value and the rated value of the capacitor shall not exceed 0 to +10%, and the ratio of the maximum to minimum capacitance measured between any two line terminals in a three-phase capacitor shall exceed 1.08. | |
| Withstand Voltage Test | Interpolar | Power frequency 2.15Un, 2S |
| Polar shell | Rated voltage of 600V and below, applied voltage of 3.6kV, 5S | |
| Rated voltage of 600V and below, applied voltage of 7.2kV, 5S | ||
| Maximum Allowable Overvoltage | 1.1Un, not exceeding 8h every 24h | |
| Self Discharge Function | The capacitor is equipped with a discharge device， which can reduce the remaining voltage of the capacitor from 2Un to 75V or below within 3 minutes of disconnecting the power supply | |
| Standards | Equipped with a discharge device, the capacitor can reduce its residual voltage from 2Un to 75V or lower within 3 minutes after the power supply is disconnected. | |
Overview of BY71 0.48-30-3 Series Cylindrical Capacitor
BY71 0.48-25-3 Series Cylindrical Capacitors: Key Components and Working Principles
1. Self-healing dielectric system (metallized polypropylene film)
The heart of the BY71 series lies in its self-healing metallized polypropylene film. When a voltage surge or harmonic stress causes local dielectric breakdown, the high current density at the fault point instantly evaporates the surrounding metallization layer, forming an insulating zone that electrically isolates the defect and restores capacitance integrity within milliseconds. Unlike traditional capacitors that permanently fail after dielectric breakdown, this self-healing mechanism ensures the capacitors continue to operate in unstable power grids with frequent voltage spikes or harmonic distortion (such as 5th/7th/11th harmonics). Ultra-pure aluminum electrodes further reduce the risk of oxidation, extending the service life to more than 20,000 hours at 85°C while maintaining stable reactive power compensation.
2. Three-phase co-compensation circuit (adaptive balance)
BY71 integrates intelligent three-phase co-compensation capabilities through embedded current sensors and IoT-enabled controllers. These components dynamically monitor phase loads in real time. For example, if phase A draws excessive inductor current (common in motors), the controller immediately adjusts the capacitors to inject offsetting capacitor currents, eliminating reactive power imbalances. This adaptive balancing technology achieves near-unity power factor (PF > 0.98) on all phases, even with fluctuating industrial loads. Key innovations include:
• Harmonic resonance damping: Anti-harmonic reactors can suppress 5th/7th harmonics to prevent voltage distortion and resonance.
• Phase-Shifted Synchronization: Capacitor switching is aligned with the voltage zero crossing to eliminate inrush current, thereby reducing stress on the contactor.
3. Cylindrical thermal management architecture (heat dissipation and packaging)
The cylindrical design optimizes thermal performance through three synergistic elements:
• Radial heat dissipation: Circular cross section allows for even heat distribution, resulting in 30% fewer hot spots compared to box-style capacitors.
• Nitrogen-Injected Epoxy Encapsulation: Fills voids within the capacitor, preventing partial discharge and moisture intrusion while accelerating heat transfer to the aluminum housing.
• Low ESR (Equivalent Series Resistance) Foil: Precision wound electrodes minimize Joule heating, which is critical at high reactive power demands (20kVar).
The triplex unit ensures stable operation at 480V in harmonic-rich environments, even when ambient temperatures reach 60°C.
Key Functions of BY71 0.48 - 30 - 3 Series Cylindrical Capacitor
1. Intelligent three-phase compensation
The BY71 series provides adaptive three-phase co-compensation through embedded IoT sensors to dynamically balance reactive power on all phases. It corrects unbalanced loads in real time, maintains a power factor close to 1 (PF > 0.98), and reduces grid losses by up to 30%. Unlike static capacitors, its intelligent control system adjusts capacitance based on load fluctuations, making it ideal for industrial machinery with changing reactive power demands. This low-voltage capacitor (480V) supports reactive power compensation in facilities such as data centers, minimizing power losses and enhancing power quality improvements.
2. Harmonic suppression and voltage stability
BY71 uses anti-harmonic dielectric technology and built-in anti-harmonic reactors to suppress 5/7/11th harmonics. Its cylindrical design optimizes heat dissipation and prevents non-linear loads (such as frequency converters or solar inverters) from overheating under high harmonic distortion. The self-healing metallized film instantly isolates micro-faults, ensuring a stable voltage curve and protecting sensitive equipment. This harmonic suppression function can reduce total harmonic distortion (THD) by 50%, which is crucial to improving the power quality in semiconductor factories.
3. Smart grid compatibility and energy efficiency
BY71 features IoT remote monitoring capabilities, enabling real-time diagnostics of reactive power, temperature, and capacitance drift through SCADA integration. Its ultra-low ESR (equivalent series resistance) design minimizes Joule heating, extending service life to more than 20,000 hours at 85°C. The capacitor optimizes energy efficiency by reducing reactive power demand on the grid, thereby reducing CO2 emissions and electricity costs. It is compatible with renewable energy systems and stabilizes low voltage ride-through (LVRT) during grid fluctuations, ensuring compliance with standards.
Product Dimensions of BY71 0.48 - 30 - 3 Series Cylindrical Capacitor
| Model | M | H | Installation sole |
| BY71 0.48-30-3 | 116mm | 290mm | M16×25mm |
Applications of BY71 0.48-30-3 Cylindrical Capacitor
Renewable energy grid connection: grid stability and low voltage ride-through (LVRT) support
Solar farms and wind turbines generate unstable reactive power and harmonic interference during grid interconnection, causing voltage sags and flickers. BY71 series capacitors provide instantaneous three-phase co-compensation during grid faults, thereby enhancing low voltage ride-through (LVRT) capabilities. The radial thermal management of its cylindrical structure ensures stability even in ambient temperatures up to 60°C, while the nitrogen-injected packaging prevents dielectric degradation in humid environments. When the voltage sags, the capacitor's DC/AC response circuit injects 25kVar capacitive current within 20 milliseconds to stabilize the bus voltage and prevent the inverter from tripping. In a case study of a 50MW solar power plant, the BY71 device reduced downtime by 30% and increased annual power generation by 15% by suppressing the 11th/13th harmonics of the PV inverter. IoT-enabled capacitors can also remotely adjust compensation parameters through a cloud platform, complying with renewable energy harmonic management grid specifications.
Commercial Critical Facilities: Energy Efficiency and Unbalanced Load Correction
Data centers and hospitals face severe load imbalance issues with single-phase IT equipment and HVAC systems, resulting in neutral current overload and energy waste. The BY71 series solves the phase imbalance problem through adaptive three-phase co-compensation technology, balancing the current by redistributing reactive power in an asymmetrical manner. Its ultra-low ESR (equivalent series resistance) design reduces Joule losses by 25%, thereby reducing cooling costs in server rooms. For Tier-4 data centers, deploying BY71 capacitors can reduce PUE (power usage effectiveness) from 1.6 to 1.4 by optimizing reactive power compensation and reducing transformer eddy current losses. Self-healing dielectric technology automatically isolates micro-faults from voltage transients, ensuring 99.99% uptime for critical loads. In addition, modular plug-and-play installation simplifies the renovation of space-constrained distribution rooms, which is in stark contrast to bulky traditional capacitor banks34 that require dedicated cooling
Industrial manufacturing plants: harmonic suppression and reactive power compensation
In industrial environments with high-density nonlinear loads such as frequency converters, CNC machine tools, and robotic arms, harmonic distortion and reactive power demand can reduce equipment efficiency and cause voltage instability. The BY71 0.48-25-3 series cylindrical capacitors address these challenges with intelligent three-phase co-compensation technology. Its cylindrical design optimizes heat dissipation to prevent thermal runaway under sustained harmonic stress, such as the 5th/7th/11th harmonics generated by frequency converters. Built-in anti-harmonic reactors suppress total harmonic distortion (THD) by up to 50%, while the adaptive IoT controller dynamically injects capacitor current to neutralize inductive reactive power, maintaining a power factor close to 1 (PF > 0.98). For semiconductor manufacturing plants, this can reduce the risk of motor overheating by 40%, eliminate power company fines for low power factor, and achieve a return on investment within 18 months. The low voltage capacitors (480V) are seamlessly integrated with the SCADA system, which enables real-time monitoring of reactive power compensation effectiveness and harmonic pollution levels, ensuring compliance with Standard .
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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.
VOur 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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